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editor_mouse.cc

/*
    Copyright (C) 2000-2001 Paul Davis 

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include <cassert>
#include <cstdlib>
#include <stdint.h>
#include <cmath>
#include <set>
#include <string>
#include <algorithm>

#include <pbd/error.h>
#include <gtkmm2ext/utils.h>
#include <pbd/memento_command.h>

#include "ardour_ui.h"
#include "editor.h"
#include "time_axis_view.h"
#include "audio_time_axis.h"
#include "audio_region_view.h"
#include "marker.h"
#include "streamview.h"
#include "region_gain_line.h"
#include "automation_time_axis.h"
#include "prompter.h"
#include "utils.h"
#include "selection.h"
#include "keyboard.h"
#include "editing.h"
#include "rgb_macros.h"

#include <ardour/types.h>
#include <ardour/profile.h>
#include <ardour/route.h>
#include <ardour/audio_track.h>
#include <ardour/audio_diskstream.h>
#include <ardour/playlist.h>
#include <ardour/audioplaylist.h>
#include <ardour/audioregion.h>
#include <ardour/dB.h>
#include <ardour/utils.h>
#include <ardour/region_factory.h>

#include <bitset>

#include "i18n.h"

using namespace std;
using namespace ARDOUR;
using namespace PBD;
using namespace sigc;
using namespace Gtk;
using namespace Editing;

nframes_t
Editor::event_frame (GdkEvent* event, double* pcx, double* pcy)
{
      double cx, cy;

      if (pcx == 0) {
            pcx = &cx;
      }
      if (pcy == 0) {
            pcy = &cy;
      }

      *pcx = 0;
      *pcy = 0;

      switch (event->type) {
      case GDK_BUTTON_RELEASE:
      case GDK_BUTTON_PRESS:
      case GDK_2BUTTON_PRESS:
      case GDK_3BUTTON_PRESS:
            track_canvas.w2c(event->button.x, event->button.y, *pcx, *pcy);
            break;
      case GDK_MOTION_NOTIFY:
            track_canvas.w2c(event->motion.x, event->motion.y, *pcx, *pcy);
            break;
      case GDK_ENTER_NOTIFY:
      case GDK_LEAVE_NOTIFY:
            track_canvas.w2c(event->crossing.x, event->crossing.y, *pcx, *pcy);
            break;
      case GDK_KEY_PRESS:
      case GDK_KEY_RELEASE:
            // track_canvas.w2c(event->key.x, event->key.y, *pcx, *pcy);
            break;
      default:
            warning << string_compose (_("Editor::event_frame() used on unhandled event type %1"), event->type) << endmsg;
            break;
      }

      /* note that pixel_to_frame() never returns less than zero, so even if the pixel
         position is negative (as can be the case with motion events in particular),
         the frame location is always positive.
      */
      
      return pixel_to_frame (*pcx);
}

void
Editor::mouse_mode_toggled (MouseMode m)
{
      if (ignore_mouse_mode_toggle) {
            return;
      }

      switch (m) {
      case MouseRange:
            if (mouse_select_button.get_active()) {
                  set_mouse_mode (m);
            }
            break;

      case MouseObject:
            if (mouse_move_button.get_active()) {
                  set_mouse_mode (m);
            }
            break;

      case MouseGain:
            if (mouse_gain_button.get_active()) {
                  set_mouse_mode (m);
            }
            break;

      case MouseZoom:
            if (mouse_zoom_button.get_active()) {
                  set_mouse_mode (m);
            }
            break;

      case MouseTimeFX:
            if (mouse_timefx_button.get_active()) {
                  set_mouse_mode (m);
            }
            break;

      case MouseAudition:
            if (mouse_audition_button.get_active()) {
                  set_mouse_mode (m);
            }
            break;

      default:
            break;
      }
}     

void
Editor::set_mouse_mode (MouseMode m, bool force)
{
      if (drag_info.item) {
            return;
      }

      if (!force && m == mouse_mode) {
            return;
      }
      
      mouse_mode = m;

      instant_save ();

      if (mouse_mode != MouseRange) {

            /* in all modes except range, hide the range selection,
               show the object (region) selection.
            */

            for (RegionSelection::iterator i = selection->regions.begin(); i != selection->regions.end(); ++i) {
                  (*i)->set_should_show_selection (true);
            }
            for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
                  (*i)->hide_selection ();
            }

      } else {

            /* 
               in range mode,show the range selection.
            */

            for (TrackSelection::iterator i = selection->tracks.begin(); i != selection->tracks.end(); ++i) {
                  if ((*i)->get_selected()) {
                        (*i)->show_selection (selection->time);
                  }
            }
      }

      /* XXX the hack of unsetting all other buttongs should go 
         away once GTK2 allows us to use regular radio buttons drawn like
         normal buttons, rather than my silly GroupedButton hack.
      */
      
      ignore_mouse_mode_toggle = true;

      switch (mouse_mode) {
      case MouseRange:
            mouse_select_button.set_active (true);
            current_canvas_cursor = selector_cursor;
            break;

      case MouseObject:
            mouse_move_button.set_active (true);
            current_canvas_cursor = grabber_cursor;
            break;

      case MouseGain:
            mouse_gain_button.set_active (true);
            current_canvas_cursor = cross_hair_cursor;
            break;

      case MouseZoom:
            mouse_zoom_button.set_active (true);
            current_canvas_cursor = zoom_cursor;
            break;

      case MouseTimeFX:
            mouse_timefx_button.set_active (true);
            current_canvas_cursor = time_fx_cursor; // just use playhead
            break;

      case MouseAudition:
            mouse_audition_button.set_active (true);
            current_canvas_cursor = speaker_cursor;
            break;
      }

      ignore_mouse_mode_toggle = false;

      if (is_drawable()) {
              track_canvas.get_window()->set_cursor(*current_canvas_cursor);
      }
}

void
Editor::step_mouse_mode (bool next)
{
      switch (current_mouse_mode()) {
      case MouseObject:
            if (next) set_mouse_mode (MouseRange);
            else set_mouse_mode (MouseTimeFX);
            break;

      case MouseRange:
            if (next) set_mouse_mode (MouseZoom);
            else set_mouse_mode (MouseObject);
            break;

      case MouseZoom:
            if (next) set_mouse_mode (MouseGain);
            else set_mouse_mode (MouseRange);
            break;
      
      case MouseGain:
            if (next) set_mouse_mode (MouseTimeFX);
            else set_mouse_mode (MouseZoom);
            break;
      
      case MouseTimeFX:
            if (next) set_mouse_mode (MouseAudition);
            else set_mouse_mode (MouseGain);
            break;

      case MouseAudition:
            if (next) set_mouse_mode (MouseObject);
            else set_mouse_mode (MouseTimeFX);
            break;
      }
}

void
Editor::button_selection (ArdourCanvas::Item* item, GdkEvent* event, ItemType item_type)
{
      bool commit = false;

      /* in object/audition/timefx mode, any button press sets
         the selection if the object can be selected. this is a
         bit of hack, because we want to avoid this if the
         mouse operation is a region alignment.

         note: not dbl-click or triple-click
      */

      if (((mouse_mode != MouseObject) &&
           (mouse_mode != MouseAudition || item_type != RegionItem) &&
           (mouse_mode != MouseTimeFX || item_type != RegionItem) &&
           (mouse_mode != MouseRange)) ||

          (event->type != GDK_BUTTON_PRESS && event->type != GDK_BUTTON_RELEASE || event->button.button > 3)) {
            
            return;
      }

      if (event->type == GDK_BUTTON_PRESS || event->type == GDK_BUTTON_RELEASE) {

            if ((event->button.state & Keyboard::RelevantModifierKeyMask) && event->button.button != 1) {
                  
                  /* almost no selection action on modified button-2 or button-3 events */
            
                  if (item_type != RegionItem && event->button.button != 2) {
                        return;
                  }
            }
      }
          
      Selection::Operation op = Keyboard::selection_type (event->button.state);
      bool press = (event->type == GDK_BUTTON_PRESS);

      // begin_reversible_command (_("select on click"));
      
      switch (item_type) {
      case RegionItem:
            if (mouse_mode != MouseRange) {
                  commit = set_selected_regionview_from_click (press, op, true);
            } else if (event->type == GDK_BUTTON_PRESS) {
                  commit = set_selected_track_from_click (press, op, false);
            }
            break;
            
      case RegionViewNameHighlight:
      case RegionViewName:
            if (mouse_mode != MouseRange) {
                  commit = set_selected_regionview_from_click (press, op, true);
            } else if (event->type == GDK_BUTTON_PRESS) {
                  commit = set_selected_track_from_click (press, op, false);
            }
            break;

      case FadeInHandleItem:
      case FadeInItem:
      case FadeOutHandleItem:
      case FadeOutItem:
            if (mouse_mode != MouseRange) {
                  commit = set_selected_regionview_from_click (press, op, true);
            } else if (event->type == GDK_BUTTON_PRESS) {
                  commit = set_selected_track_from_click (press, op, false);
            }
            break;
            
      case GainAutomationControlPointItem:
      case PanAutomationControlPointItem:
      case RedirectAutomationControlPointItem:
            commit = set_selected_track_from_click (press, op, true);
            if (mouse_mode != MouseRange) {
                  commit |= set_selected_control_point_from_click (op, false);
            }
            break;
            
      case StreamItem:
            /* for context click or range selection, select track */
            if (event->button.button == 3) {
                  commit = set_selected_track_from_click (press, op, true);
            } else if (event->type == GDK_BUTTON_PRESS && mouse_mode == MouseRange) {
                  commit = set_selected_track_from_click (press, op, false);
            }
            break;
                
      case AutomationTrackItem:
            commit = set_selected_track_from_click (press, op, true);
            break;
            
      default:
            break;
      }
      
//    if (commit) {
//          commit_reversible_command ();
//    }
}

bool
Editor::button_press_handler (ArdourCanvas::Item* item, GdkEvent* event, ItemType item_type)
{
      track_canvas.grab_focus();

      if (session && session->actively_recording()) {
            return true;
      }

      button_selection (item, event, item_type);
      
      if (drag_info.item == 0 &&
          (Keyboard::is_delete_event (&event->button) ||
           Keyboard::is_context_menu_event (&event->button) ||
           Keyboard::is_edit_event (&event->button))) {
            
            /* handled by button release */
            return true;
      }

      switch (event->button.button) {
      case 1:

            if (event->type == GDK_BUTTON_PRESS) {

                  if (drag_info.item) {
                        drag_info.item->ungrab (event->button.time);
                  }

                  /* single mouse clicks on any of these item types operate
                     independent of mouse mode, mostly because they are
                     not on the main track canvas or because we want
                     them to be modeless.
                  */
                  
                  switch (item_type) {
                  case EditCursorItem:
                  case PlayheadCursorItem:
                        start_cursor_grab (item, event);
                        return true;

                  case MarkerItem:
                        if (Keyboard::modifier_state_equals (event->button.state, 
                                                     Keyboard::ModifierMask(Keyboard::Control|Keyboard::Shift))) {
                              hide_marker (item, event);
                        } else {
                              start_marker_grab (item, event);
                        }
                        return true;

                  case TempoMarkerItem:
                        if (Keyboard::modifier_state_contains (event->button.state, Keyboard::Control)) {
                              start_tempo_marker_copy_grab (item, event);
                        } else {
                              start_tempo_marker_grab (item, event);
                        }
                        return true;

                  case MeterMarkerItem:
                        if (Keyboard::modifier_state_contains (event->button.state, Keyboard::Control)) {
                              start_meter_marker_copy_grab (item, event);
                        } else {
                              start_meter_marker_grab (item, event);
                        }
                        return true;

                  case TempoBarItem:
                        return true;

                  case MeterBarItem:
                        return true;
                        
                  case RangeMarkerBarItem:
                        start_range_markerbar_op (item, event, CreateRangeMarker); 
                        return true;
                        break;

                  case TransportMarkerBarItem:
                        start_range_markerbar_op (item, event, CreateTransportMarker); 
                        return true;
                        break;

                  default:
                        break;
                  }
            }

            switch (mouse_mode) {
            case MouseRange:
                  switch (item_type) {
                  case StartSelectionTrimItem:
                        start_selection_op (item, event, SelectionStartTrim);
                        break;
                        
                  case EndSelectionTrimItem:
                        start_selection_op (item, event, SelectionEndTrim);
                        break;

                  case SelectionItem:
                        if (Keyboard::modifier_state_contains 
                            (event->button.state, Keyboard::ModifierMask(Keyboard::Alt))) {
                              // contains and not equals because I can't use alt as a modifier alone.
                              start_selection_grab (item, event);
                        } else if (Keyboard::modifier_state_equals (event->button.state, Keyboard::Control)) {
                              /* grab selection for moving */
                              start_selection_op (item, event, SelectionMove);
                        }
                        else {
                              /* this was debated, but decided the more common action was to
                                 make a new selection */
                              start_selection_op (item, event, CreateSelection);
                        }
                        break;

                  default:
                        start_selection_op (item, event, CreateSelection);
                  }
                  return true;
                  break;
                  
            case MouseObject:
                  if (Keyboard::modifier_state_contains (event->button.state, Keyboard::ModifierMask(Keyboard::Control|Keyboard::Alt)) &&
                      event->type == GDK_BUTTON_PRESS) {
                        
                        start_rubberband_select (item, event);

                  } else if (event->type == GDK_BUTTON_PRESS) {

                        switch (item_type) {
                        case FadeInHandleItem:
                              start_fade_in_grab (item, event);
                              return true;
                              
                        case FadeOutHandleItem:
                              start_fade_out_grab (item, event);
                              return true;

                        case RegionItem:
                              if (Keyboard::modifier_state_contains (event->button.state, Keyboard::Control)) {
                                    start_region_copy_grab (item, event);
                              } else if (Keyboard::the_keyboard().key_is_down (GDK_b)) {
                                    start_region_brush_grab (item, event);
                              } else {
                                    start_region_grab (item, event);
                              }
                              break;
                              
                        case RegionViewNameHighlight:
                              start_trim (item, event);
                              return true;
                              break;
                              
                        case RegionViewName:
                              /* rename happens on edit clicks */
                                    start_trim (clicked_regionview->get_name_highlight(), event);
                                    return true;
                              break;

                        case GainAutomationControlPointItem:
                        case PanAutomationControlPointItem:
                        case RedirectAutomationControlPointItem:
                              start_control_point_grab (item, event);
                              return true;
                              break;
                              
                        case GainAutomationLineItem:
                        case PanAutomationLineItem:
                        case RedirectAutomationLineItem:
                              start_line_grab_from_line (item, event);
                              return true;
                              break;

                        case StreamItem:
                        case AutomationTrackItem:
                              start_rubberband_select (item, event);
                              break;
                              
                        /* <CMT Additions> */
                        case ImageFrameHandleStartItem:
                              imageframe_start_handle_op(item, event) ;
                              return(true) ;
                              break ;
                        case ImageFrameHandleEndItem:
                              imageframe_end_handle_op(item, event) ;
                              return(true) ;
                              break ;
                        case MarkerViewHandleStartItem:
                              markerview_item_start_handle_op(item, event) ;
                              return(true) ;
                              break ;
                        case MarkerViewHandleEndItem:
                              markerview_item_end_handle_op(item, event) ;
                              return(true) ;
                              break ;
                        /* </CMT Additions> */
                        
                        /* <CMT Additions> */
                        case MarkerViewItem:
                              start_markerview_grab(item, event) ;
                              break ;
                        case ImageFrameItem:
                              start_imageframe_grab(item, event) ;
                              break ;
                        /* </CMT Additions> */

                        case MarkerBarItem:
                              
                              break;

                        default:
                              break;
                        }
                  }
                  return true;
                  break;
                  
            case MouseGain:
                  switch (item_type) {
                  case RegionItem:
                        // start_line_grab_from_regionview (item, event);
                        break;

                  case GainControlPointItem:
                        start_control_point_grab (item, event);
                        return true;
                        
                  case GainLineItem:
                        start_line_grab_from_line (item, event);
                        return true;

                  case GainAutomationControlPointItem:
                  case PanAutomationControlPointItem:
                  case RedirectAutomationControlPointItem:
                        start_control_point_grab (item, event);
                        return true;
                        break;

                  default:
                        break;
                  }
                  return true;
                  break;

                  switch (item_type) {
                  case GainAutomationControlPointItem:
                  case PanAutomationControlPointItem:
                  case RedirectAutomationControlPointItem:
                        start_control_point_grab (item, event);
                        break;

                  case GainAutomationLineItem:
                  case PanAutomationLineItem:
                  case RedirectAutomationLineItem:
                        start_line_grab_from_line (item, event);
                        break;

                  case RegionItem:
                        // XXX need automation mode to identify which
                        // line to use
                        // start_line_grab_from_regionview (item, event);
                        break;

                  default:
                        break;
                  }
                  return true;
                  break;

            case MouseZoom:
                  if (event->type == GDK_BUTTON_PRESS) {
                        start_mouse_zoom (item, event);
                  }

                  return true;
                  break;

            case MouseTimeFX:
                  if (item_type == RegionItem) {
                        start_time_fx (item, event);
                  }
                  break;

            case MouseAudition:
                  /* handled in release */
                  break;

            default:
                  break;
            }
            break;

      case 2:
            switch (mouse_mode) {
            case MouseObject:
                  if (event->type == GDK_BUTTON_PRESS) {
                        switch (item_type) {
                        case RegionItem:
                              if (Keyboard::modifier_state_contains (event->button.state, Keyboard::Control)) {
                                    start_region_copy_grab (item, event);
                              } else {
                                    start_region_grab (item, event);
                              }
                              
                              break;
                        case GainAutomationControlPointItem:
                        case PanAutomationControlPointItem:
                        case RedirectAutomationControlPointItem:
                              start_control_point_grab (item, event);
                              return true;
                              break;
                              
                        default:
                              break;
                        }
                  }
                  
                  
                  switch (item_type) {
                  case RegionViewNameHighlight:
                        start_trim (item, event);
                        return true;
                        break;
                        
                  case RegionViewName:
                        start_trim (clicked_regionview->get_name_highlight(), event);
                        return true;
                        break;
                        
                  default:
                        break;
                  }
                  
                  break;

            case MouseRange:
                  if (event->type == GDK_BUTTON_PRESS) {
                        /* relax till release */
                  }
                  return true;
                  break;
                              
                        
            case MouseZoom:
                  if (Keyboard::modifier_state_equals (event->button.state, Keyboard::Control)) {
                        temporal_zoom_session();
                  } else {
                        temporal_zoom_to_frame (true, event_frame(event));
                  }
                  return true;
                  break;

            default:
                  break;
            }

            break;

      case 3:
            break;

      default:
            break;

      }

      return false;
}

bool
Editor::button_release_handler (ArdourCanvas::Item* item, GdkEvent* event, ItemType item_type)
{
      nframes_t where = event_frame (event, 0, 0);

      /* no action if we're recording */
                                    
      if (session && session->actively_recording()) {
            return true;
      }

      /* first, see if we're finishing a drag ... */

      if (drag_info.item) {
            if (end_grab (item, event)) {
                  /* grab dragged, so do nothing else */
                  return true;
            }
      }
      
      button_selection (item, event, item_type);

      /* edit events get handled here */
      
      if (drag_info.item == 0 && Keyboard::is_edit_event (&event->button)) {
            switch (item_type) {
            case RegionItem:
                  edit_region ();
                  break;

            case TempoMarkerItem:
                  edit_tempo_marker (item);
                  break;
                  
            case MeterMarkerItem:
                  edit_meter_marker (item);
                  break;
                  
            case RegionViewName:
                  if (clicked_regionview->name_active()) {
                        return mouse_rename_region (item, event);
                  }
                  break;

            default:
                  break;
            }
            return true;
      }

      /* context menu events get handled here */

      if (Keyboard::is_context_menu_event (&event->button)) {

            if (drag_info.item == 0) {

                  /* no matter which button pops up the context menu, tell the menu
                     widget to use button 1 to drive menu selection.
                  */

                  switch (item_type) {
                  case FadeInItem:
                  case FadeInHandleItem:
                  case FadeOutItem:
                  case FadeOutHandleItem:
                        popup_fade_context_menu (1, event->button.time, item, item_type);
                        break;

                  case StreamItem:
                        popup_track_context_menu (1, event->button.time, item_type, false, where);
                        break;
                        
                  case RegionItem:
                  case RegionViewNameHighlight:
                  case RegionViewName:
                        popup_track_context_menu (1, event->button.time, item_type, false, where);
                        break;
                        
                  case SelectionItem:
                        popup_track_context_menu (1, event->button.time, item_type, true, where);
                        break;

                  case AutomationTrackItem:
                        popup_track_context_menu (1, event->button.time, item_type, false, where);
                        break;

                  case MarkerBarItem: 
                  case RangeMarkerBarItem: 
                  case TransportMarkerBarItem: 
                  case TempoBarItem:
                  case MeterBarItem:
                        popup_ruler_menu (pixel_to_frame(event->button.x), item_type);
                        break;

                  case MarkerItem:
                        marker_context_menu (&event->button, item);
                        break;

                  case TempoMarkerItem:
                        tm_marker_context_menu (&event->button, item);
                        break;
                        
                  case MeterMarkerItem:
                        tm_marker_context_menu (&event->button, item);
                        break;

                  case CrossfadeViewItem:
                        popup_track_context_menu (1, event->button.time, item_type, false, where);
                        break;

                  /* <CMT Additions> */
                  case ImageFrameItem:
                        popup_imageframe_edit_menu(1, event->button.time, item, true) ;
                        break ;
                  case ImageFrameTimeAxisItem:
                        popup_imageframe_edit_menu(1, event->button.time, item, false) ;
                        break ;
                  case MarkerViewItem:
                        popup_marker_time_axis_edit_menu(1, event->button.time, item, true) ;
                        break ;
                  case MarkerTimeAxisItem:
                        popup_marker_time_axis_edit_menu(1, event->button.time, item, false) ;
                        break ;
                  /* <CMT Additions> */

                        
                  default:
                        break;
                  }

                  return true;
            }
      }

      /* delete events get handled here */

      if (drag_info.item == 0 && Keyboard::is_delete_event (&event->button)) {

            switch (item_type) {
            case TempoMarkerItem:
                  remove_tempo_marker (item);
                  break;
                  
            case MeterMarkerItem:
                  remove_meter_marker (item);
                  break;

            case MarkerItem:
                  remove_marker (*item, event);
                  break;

            case RegionItem:
                  if (mouse_mode == MouseObject) {
                        remove_clicked_region ();
                  }
                  break;
                  
            case GainControlPointItem:
                  if (mouse_mode == MouseGain) {
                        remove_gain_control_point (item, event);
                  }
                  break;

            case GainAutomationControlPointItem:
            case PanAutomationControlPointItem:
            case RedirectAutomationControlPointItem:
                  remove_control_point (item, event);
                  break;

            default:
                  break;
            }
            return true;
      }

      switch (event->button.button) {
      case 1:

            switch (item_type) {
            /* see comments in button_press_handler */
            case EditCursorItem:
            case PlayheadCursorItem:
            case MarkerItem:
            case GainLineItem:
            case GainAutomationLineItem:
            case PanAutomationLineItem:
            case RedirectAutomationLineItem:
            case StartSelectionTrimItem:
            case EndSelectionTrimItem:
                  return true;

            case MarkerBarItem:
                  if (!Keyboard::modifier_state_contains (event->button.state, Keyboard::snap_modifier())) {
                        snap_to (where, 0, true);
                  }
                  mouse_add_new_marker (where);
                  return true;

            case TempoBarItem:
                  if (!Keyboard::modifier_state_contains (event->button.state, Keyboard::snap_modifier())) {
                        snap_to (where);
                  }
                  mouse_add_new_tempo_event (where);
                  return true;
                  
            case MeterBarItem:
                  mouse_add_new_meter_event (pixel_to_frame (event->button.x));
                  return true;
                  break;

            default:
                  break;
            }

            switch (mouse_mode) {
            case MouseObject:
                  switch (item_type) {
                  case AutomationTrackItem:
                        dynamic_cast<AutomationTimeAxisView*>(clicked_trackview)->add_automation_event 
                              (item,
                               event,
                               where,
                               event->button.y);
                        return true;
                        break;

                  default:
                        break;
                  }
                  break;

            case MouseGain:
                  // Gain only makes sense for audio regions

                  if (!dynamic_cast<AudioRegionView*>(clicked_regionview)) {
                        break;
                  }

                  switch (item_type) {
                  case RegionItem:
                        dynamic_cast<AudioRegionView*>(clicked_regionview)->add_gain_point_event (item, event);
                        return true;
                        break;
                        
                  case AutomationTrackItem:
                        dynamic_cast<AutomationTimeAxisView*>(clicked_trackview)->
                              add_automation_event (item, event, where, event->button.y);
                        return true;
                        break;
                  default:
                        break;
                  }
                  break;
                  
            case MouseAudition:
                  switch (item_type) {
                  case RegionItem:
                        audition_selected_region ();
                        break;
                  default:
                        break;
                  }
                  break;

            default:
                  break;

            }

            return true;
            break;


      case 2:
            switch (mouse_mode) {
                  
            case MouseObject:
                  switch (item_type) {
                  case RegionItem:
                        if (Keyboard::modifier_state_equals (event->button.state, Keyboard::Shift)) {
                              raise_region ();
                        } else if (Keyboard::modifier_state_equals (event->button.state, Keyboard::ModifierMask (Keyboard::Shift|Keyboard::Alt))) {
                              lower_region ();
                        } else {
                              // Button2 click is unused
                        }
                        return true;
                        
                        break;
                        
                  default:
                        break;
                  }
                  break;
                  
            case MouseRange:
                  
                  // x_style_paste (where, 1.0);
                  return true;
                  break;
                  
            default:
                  break;
            }

            break;
      
      case 3:
            break;
            
      default:
            break;
      }
      return false;
}

bool
Editor::enter_handler (ArdourCanvas::Item* item, GdkEvent* event, ItemType item_type)
{
      ControlPoint* cp;
      Marker * marker;
      double fraction;
      
      switch (item_type) {
      case GainControlPointItem:
            if (mouse_mode == MouseGain) {
                  cp = static_cast<ControlPoint*>(item->get_data ("control_point"));
                  cp->set_visible (true);

                  double at_x, at_y;
                  at_x = cp->get_x();
                  at_y = cp->get_y ();
                  cp->item->i2w (at_x, at_y);
                  at_x += 20.0;
                  at_y += 20.0;

                  fraction = 1.0 - (cp->get_y() / cp->line.height());

                  set_verbose_canvas_cursor (cp->line.get_verbose_cursor_string (fraction), at_x, at_y);
                  show_verbose_canvas_cursor ();

                  if (is_drawable()) {
                          track_canvas.get_window()->set_cursor (*fader_cursor);
                  }
            }
            break;

      case GainAutomationControlPointItem:
      case PanAutomationControlPointItem:
      case RedirectAutomationControlPointItem:
            if (mouse_mode == MouseGain || mouse_mode == MouseObject) {
                  cp = static_cast<ControlPoint*>(item->get_data ("control_point"));
                  cp->set_visible (true);

                  double at_x, at_y;
                  at_x = cp->get_x();
                  at_y = cp->get_y ();
                  cp->item->i2w (at_x, at_y);
                  at_x += 20.0;
                  at_y += 20.0;

                  fraction = 1.0 - (cp->get_y() / cp->line.height());

                  set_verbose_canvas_cursor (cp->line.get_verbose_cursor_string (fraction), at_x, at_y);
                  show_verbose_canvas_cursor ();

                  if (is_drawable()) {
                        track_canvas.get_window()->set_cursor (*fader_cursor);
                  }
            }
            break;
            
      case GainLineItem:
            if (mouse_mode == MouseGain) {
                  ArdourCanvas::Line *line = dynamic_cast<ArdourCanvas::Line *> (item);
                  if (line)
                        line->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_EnteredGainLine.get();
                  if (is_drawable()) {
                        track_canvas.get_window()->set_cursor (*fader_cursor);
                  }
            }
            break;
                  
      case GainAutomationLineItem:
      case RedirectAutomationLineItem:
      case PanAutomationLineItem:
            if (mouse_mode == MouseGain || mouse_mode == MouseObject) {
                  {
                        ArdourCanvas::Line *line = dynamic_cast<ArdourCanvas::Line *> (item);
                        if (line)
                              line->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_EnteredAutomationLine.get();
                  }
                  if (is_drawable()) {
                        track_canvas.get_window()->set_cursor (*fader_cursor);
                  }
            }
            break;
            
      case RegionViewNameHighlight:
            if (is_drawable() && mouse_mode == MouseObject) {
                  track_canvas.get_window()->set_cursor (*trimmer_cursor);
            }
            break;

      case StartSelectionTrimItem:
      case EndSelectionTrimItem:
      /* <CMT Additions> */
      case ImageFrameHandleStartItem:
      case ImageFrameHandleEndItem:
      case MarkerViewHandleStartItem:
      case MarkerViewHandleEndItem:
      /* </CMT Additions> */

            if (is_drawable()) {
                  track_canvas.get_window()->set_cursor (*trimmer_cursor);
            }
            break;

      case EditCursorItem:
      case PlayheadCursorItem:
            if (is_drawable()) {
                  track_canvas.get_window()->set_cursor (*grabber_cursor);
            }
            break;

      case RegionViewName:
            
            /* when the name is not an active item, the entire name highlight is for trimming */

            if (!reinterpret_cast<RegionView *> (item->get_data ("regionview"))->name_active()) {
                  if (mouse_mode == MouseObject && is_drawable()) {
                        track_canvas.get_window()->set_cursor (*trimmer_cursor);
                  }
            } 
            break;


      case AutomationTrackItem:
            if (is_drawable()) {
                    Gdk::Cursor *cursor;
                  switch (mouse_mode) {
                  case MouseRange:
                        cursor = selector_cursor;
                        break;
                  case MouseZoom:
                        cursor = zoom_cursor;
                        break;
                  default:
                        cursor = cross_hair_cursor;
                        break;
                  }

                  track_canvas.get_window()->set_cursor (*cursor);

                  AutomationTimeAxisView* atv;
                  if ((atv = static_cast<AutomationTimeAxisView*>(item->get_data ("trackview"))) != 0) {
                        clear_entered_track = false;
                        set_entered_track (atv);
                  }
            }
            break;

      case MarkerBarItem:
      case RangeMarkerBarItem:
      case TransportMarkerBarItem:
      case MeterBarItem:
      case TempoBarItem:
            if (is_drawable()) {
                  time_canvas.get_window()->set_cursor (*timebar_cursor);
            }
            break;

      case MarkerItem:
            if ((marker = static_cast<Marker *> (item->get_data ("marker"))) == 0) {
                  break;
            }
            marker->set_color_rgba (ARDOUR_UI::config()->canvasvar_EnteredMarker.get());
            // fall through
      case MeterMarkerItem:
      case TempoMarkerItem:
            if (is_drawable()) {
                  time_canvas.get_window()->set_cursor (*timebar_cursor);
            }
            break;
      case FadeInHandleItem:
      case FadeOutHandleItem:
            if (mouse_mode == MouseObject) {
                  ArdourCanvas::SimpleRect *rect = dynamic_cast<ArdourCanvas::SimpleRect *> (item);
                  if (rect) {
                        rect->property_fill_color_rgba() = 0;
                        rect->property_outline_pixels() = 1;
                  }
            }
            break;

      default:
            break;
      }

      /* second pass to handle entered track status in a comprehensible way.
       */

      switch (item_type) {
      case GainLineItem:
      case GainAutomationLineItem:
      case RedirectAutomationLineItem:
      case PanAutomationLineItem:
      case GainControlPointItem:
      case GainAutomationControlPointItem:
      case PanAutomationControlPointItem:
      case RedirectAutomationControlPointItem:
            /* these do not affect the current entered track state */
            clear_entered_track = false;
            break;

      case AutomationTrackItem:
            /* handled above already */
            break;

      default:
            set_entered_track (0);
            break;
      }

      return false;
}

bool
Editor::leave_handler (ArdourCanvas::Item* item, GdkEvent* event, ItemType item_type)
{
      AutomationLine* al;
      ControlPoint* cp;
      Marker *marker;
      Location *loc;
      RegionView* rv;
      bool is_start;

      switch (item_type) {
      case GainControlPointItem:
      case GainAutomationControlPointItem:
      case PanAutomationControlPointItem:
      case RedirectAutomationControlPointItem:
            cp = reinterpret_cast<ControlPoint*>(item->get_data ("control_point"));
            if (cp->line.npoints() > 1) {
                  if (!cp->selected) {
                        cp->set_visible (false);
                  }
            }
            
            if (is_drawable()) {
                  track_canvas.get_window()->set_cursor (*current_canvas_cursor);
            }

            hide_verbose_canvas_cursor ();
            break;
            
      case RegionViewNameHighlight:
      case StartSelectionTrimItem:
      case EndSelectionTrimItem:
      case EditCursorItem:
      case PlayheadCursorItem:
      /* <CMT Additions> */
      case ImageFrameHandleStartItem:
      case ImageFrameHandleEndItem:
      case MarkerViewHandleStartItem:
      case MarkerViewHandleEndItem:
      /* </CMT Additions> */
            if (is_drawable()) {
                  track_canvas.get_window()->set_cursor (*current_canvas_cursor);
            }
            break;

      case GainLineItem:
      case GainAutomationLineItem:
      case RedirectAutomationLineItem:
      case PanAutomationLineItem:
            al = reinterpret_cast<AutomationLine*> (item->get_data ("line"));
            {
                  ArdourCanvas::Line *line = dynamic_cast<ArdourCanvas::Line *> (item);
                  if (line)
                        line->property_fill_color_rgba() = al->get_line_color();
            }
            if (is_drawable()) {
                  track_canvas.get_window()->set_cursor (*current_canvas_cursor);
            }
            break;

      case RegionViewName:
            /* see enter_handler() for notes */
            if (!reinterpret_cast<RegionView *> (item->get_data ("regionview"))->name_active()) {
                  if (is_drawable() && mouse_mode == MouseObject) {
                        track_canvas.get_window()->set_cursor (*current_canvas_cursor);
                  }
            }
            break;

      case RangeMarkerBarItem:
      case TransportMarkerBarItem:
      case MeterBarItem:
      case TempoBarItem:
      case MarkerBarItem:
            if (is_drawable()) {
                  time_canvas.get_window()->set_cursor (*timebar_cursor);
            }
            break;
            
      case MarkerItem:
            if ((marker = static_cast<Marker *> (item->get_data ("marker"))) == 0) {
                  break;
            }
            loc = find_location_from_marker (marker, is_start);
            if (loc) location_flags_changed (loc, this);
            // fall through
      case MeterMarkerItem:
      case TempoMarkerItem:
            
            if (is_drawable()) {
                  time_canvas.get_window()->set_cursor (*timebar_cursor);
            }

            break;

      case FadeInHandleItem:
      case FadeOutHandleItem:
            rv = static_cast<RegionView*>(item->get_data ("regionview"));
            {
                  ArdourCanvas::SimpleRect *rect = dynamic_cast<ArdourCanvas::SimpleRect *> (item);
                  if (rect) {
                        rect->property_fill_color_rgba() = rv->get_fill_color();
                        rect->property_outline_pixels() = 0;
                  }
            }
            break;

      case AutomationTrackItem:
            if (is_drawable()) {
                  track_canvas.get_window()->set_cursor (*current_canvas_cursor);
                  clear_entered_track = true;
                  Glib::signal_idle().connect (mem_fun(*this, &Editor::left_automation_track));
            }
            break;
            
      default:
            break;
      }

      return false;
}

gint
Editor::left_automation_track ()
{
      if (clear_entered_track) {
            set_entered_track (0);
            clear_entered_track = false;
      }
      return false;
}

bool
Editor::motion_handler (ArdourCanvas::Item* item, GdkEvent* event, ItemType item_type, bool from_autoscroll)
{
      gint x, y;
      
      /* We call this so that MOTION_NOTIFY events continue to be
         delivered to the canvas. We need to do this because we set
         Gdk::POINTER_MOTION_HINT_MASK on the canvas. This reduces
         the density of the events, at the expense of a round-trip
         to the server. Given that this will mostly occur on cases
         where DISPLAY = :0.0, and given the cost of what the motion
         event might do, its a good tradeoff.  
      */

      track_canvas.get_pointer (x, y);

      if (current_stepping_trackview) {
            /* don't keep the persistent stepped trackview if the mouse moves */
            current_stepping_trackview = 0;
            step_timeout.disconnect ();
      }

      if (session && session->actively_recording()) {
            /* Sorry. no dragging stuff around while we record */
            return true;
      }

      drag_info.item_type = item_type;
      drag_info.current_pointer_frame = event_frame (event, &drag_info.current_pointer_x,
                                           &drag_info.current_pointer_y);

      if (!from_autoscroll && drag_info.item) {
            /* item != 0 is the best test i can think of for dragging.
            */
            if (!drag_info.move_threshold_passed) {

                  bool x_threshold_passed =  (abs ((nframes64_t) (drag_info.current_pointer_x - drag_info.grab_x)) > 4LL);
                  bool y_threshold_passed =  (abs ((nframes64_t) (drag_info.current_pointer_y - drag_info.grab_y)) > 4LL);
                  
                  drag_info.move_threshold_passed = (x_threshold_passed || y_threshold_passed);
                  
                  // and change the initial grab loc/frame if this drag info wants us to

                  if (drag_info.want_move_threshold && drag_info.move_threshold_passed) {
                        drag_info.grab_frame = drag_info.current_pointer_frame;
                        drag_info.grab_x = drag_info.current_pointer_x;
                        drag_info.grab_y = drag_info.current_pointer_y;
                        drag_info.last_pointer_frame = drag_info.grab_frame;
                        drag_info.pointer_frame_offset = drag_info.grab_frame - drag_info.last_frame_position;
                  }
            }
      }

      switch (item_type) {
      case PlayheadCursorItem:
      case EditCursorItem:
      case MarkerItem:
      case GainControlPointItem:
      case RedirectAutomationControlPointItem:
      case GainAutomationControlPointItem:
      case PanAutomationControlPointItem:
      case TempoMarkerItem:
      case MeterMarkerItem:
      case RegionViewNameHighlight:
      case StartSelectionTrimItem:
      case EndSelectionTrimItem:
      case SelectionItem:
      case GainLineItem:
      case RedirectAutomationLineItem:
      case GainAutomationLineItem:
      case PanAutomationLineItem:
      case FadeInHandleItem:
      case FadeOutHandleItem:
      /* <CMT Additions> */
      case ImageFrameHandleStartItem:
      case ImageFrameHandleEndItem:
      case MarkerViewHandleStartItem:
      case MarkerViewHandleEndItem:
      /* </CMT Additions> */
        if (drag_info.item && (event->motion.state & Gdk::BUTTON1_MASK ||
                         (event->motion.state & Gdk::BUTTON2_MASK))) {
              if (!from_autoscroll) {
                    maybe_autoscroll (event);
              }
              (this->*(drag_info.motion_callback)) (item, event);
              goto handled;
        }
        goto not_handled;
        
      default:
            break;
      }

      switch (mouse_mode) {
      case MouseObject:
      case MouseRange:
      case MouseZoom:
      case MouseTimeFX:
            if (drag_info.item && (event->motion.state & GDK_BUTTON1_MASK ||
                               (event->motion.state & GDK_BUTTON2_MASK))) {
                  if (!from_autoscroll) {
                        maybe_autoscroll (event);
                  }
                  (this->*(drag_info.motion_callback)) (item, event);
                  goto handled;
            }
            goto not_handled;
            break;

      default:
            break;
      }

  handled:
      track_canvas_motion (event);
      // drag_info.last_pointer_frame = drag_info.current_pointer_frame;
      return true;
      
  not_handled:
      return false;
}

void
Editor::start_grab (GdkEvent* event, Gdk::Cursor *cursor)
{
      if (drag_info.item == 0) {
            fatal << _("programming error: start_grab called without drag item") << endmsg;
            /*NOTREACHED*/
            return;
      }

      if (cursor == 0) {
            cursor = grabber_cursor;
      }

        // if dragging with button2, the motion is x constrained, with Alt-button2 it is y constrained

      if (event->button.button == 2) {
            if (Keyboard::modifier_state_equals (event->button.state, Keyboard::Alt)) {
                  drag_info.y_constrained = true;
                  drag_info.x_constrained = false;
            } else {
                  drag_info.y_constrained = false;
                  drag_info.x_constrained = true;
            }
      } else {
            drag_info.x_constrained = false;
            drag_info.y_constrained = false;
      }

      drag_info.grab_frame = event_frame (event, &drag_info.grab_x, &drag_info.grab_y);
      drag_info.last_pointer_frame = drag_info.grab_frame;
      drag_info.current_pointer_frame = drag_info.grab_frame;
      drag_info.current_pointer_x = drag_info.grab_x;
      drag_info.current_pointer_y = drag_info.grab_y;
      drag_info.cumulative_x_drag = 0;
      drag_info.cumulative_y_drag = 0;
      drag_info.first_move = true;
      drag_info.move_threshold_passed = false;
      drag_info.want_move_threshold = false;
      drag_info.pointer_frame_offset = 0;
      drag_info.brushing = false;
      drag_info.copied_location = 0;

      drag_info.item->grab (Gdk::POINTER_MOTION_MASK|Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK,
                        *cursor,
                        event->button.time);

      if (session && session->transport_rolling()) {
            drag_info.was_rolling = true;
      } else {
            drag_info.was_rolling = false;
      }

      switch (snap_type) {
      case SnapToRegionStart:
      case SnapToRegionEnd:
      case SnapToRegionSync:
      case SnapToRegionBoundary:
            build_region_boundary_cache ();
            break;
      default:
            break;
      }
}

void
Editor::swap_grab (ArdourCanvas::Item* new_item, Gdk::Cursor* cursor, uint32_t time)
{
      drag_info.item->ungrab (0);
      drag_info.item = new_item;

      if (cursor == 0) {
            cursor = grabber_cursor;
      }

      drag_info.item->grab (Gdk::POINTER_MOTION_MASK|Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK, *cursor, time);
}

bool
Editor::end_grab (ArdourCanvas::Item* item, GdkEvent* event)
{
      bool did_drag = false;

      stop_canvas_autoscroll ();

      if (drag_info.item == 0) {
            return false;
      }
      
      drag_info.item->ungrab (event->button.time);

      if (drag_info.finished_callback) {
            (this->*(drag_info.finished_callback)) (item, event);
      }

      did_drag = !drag_info.first_move;

      hide_verbose_canvas_cursor();

      drag_info.item = 0;
      drag_info.copy = false;
      drag_info.motion_callback = 0;
      drag_info.finished_callback = 0;
      drag_info.last_trackview = 0;
      drag_info.last_frame_position = 0;
      drag_info.grab_frame = 0;
      drag_info.last_pointer_frame = 0;
      drag_info.current_pointer_frame = 0;
      drag_info.brushing = false;

      if (drag_info.copied_location) {
            delete drag_info.copied_location;
            drag_info.copied_location = 0;
      }

      return did_drag;
}

void
Editor::set_edit_cursor (GdkEvent* event)
{
      nframes_t pointer_frame = event_frame (event);

      if (!Keyboard::modifier_state_contains (event->button.state, Keyboard::snap_modifier())) {
            if (snap_type != SnapToEditCursor) {
                  snap_to (pointer_frame);
            }
      }

      edit_cursor->set_position (pointer_frame);
      edit_cursor_clock.set (pointer_frame);
}

void
Editor::set_playhead_cursor (GdkEvent* event)
{
      nframes_t pointer_frame = event_frame (event);

      if (!Keyboard::modifier_state_contains (event->button.state, Keyboard::snap_modifier())) {
            snap_to (pointer_frame);
      }

      if (session) {
            session->request_locate (pointer_frame, session->transport_rolling());
      }
}

void
Editor::start_fade_in_grab (ArdourCanvas::Item* item, GdkEvent* event)
{
      drag_info.item = item;
      drag_info.motion_callback = &Editor::fade_in_drag_motion_callback;
      drag_info.finished_callback = &Editor::fade_in_drag_finished_callback;

      start_grab (event);

      if ((drag_info.data = (item->get_data ("regionview"))) == 0) {
            fatal << _("programming error: fade in canvas item has no regionview data pointer!") << endmsg;
            /*NOTREACHED*/
      }

      AudioRegionView* arv = static_cast<AudioRegionView*>(drag_info.data);

      drag_info.pointer_frame_offset = drag_info.grab_frame - ((nframes_t) arv->audio_region()->fade_in().back()->when + arv->region()->position());  
}

void
Editor::fade_in_drag_motion_callback (ArdourCanvas::Item* item, GdkEvent* event)
{
      AudioRegionView* arv = static_cast<AudioRegionView*>(drag_info.data);
      nframes_t pos;
      nframes_t fade_length;

      if (drag_info.current_pointer_frame > drag_info.pointer_frame_offset) {
            pos = drag_info.current_pointer_frame - drag_info.pointer_frame_offset;
      }
      else {
            pos = 0;
      }

      if (!Keyboard::modifier_state_contains (event->button.state, Keyboard::snap_modifier())) {
            snap_to (pos);
      }

      if (pos < (arv->region()->position() + 64)) {
            fade_length = 64; // this should be a minimum defined somewhere
      } else if (pos > arv->region()->last_frame()) {
            fade_length = arv->region()->length();
      } else {
            fade_length = pos - arv->region()->position();
      }           
      /* mapover the region selection */

      for (RegionSelection::iterator i = selection->regions.begin(); i != selection->regions.end(); ++i) {

            AudioRegionView* tmp = dynamic_cast<AudioRegionView*> (*i);
            
            if (!tmp) {
                  continue;
            }
      
            tmp->reset_fade_in_shape_width (fade_length);
      }

      show_verbose_duration_cursor (arv->region()->position(),  arv->region()->position() + fade_length, 10);

      drag_info.first_move = false;
}

void
Editor::fade_in_drag_finished_callback (ArdourCanvas::Item* item, GdkEvent* event)
{
      AudioRegionView* arv = static_cast<AudioRegionView*>(drag_info.data);
      nframes_t pos;
      nframes_t fade_length;

      if (drag_info.first_move) return;

      if (drag_info.current_pointer_frame > drag_info.pointer_frame_offset) {
            pos = drag_info.current_pointer_frame - drag_info.pointer_frame_offset;
      } else {
            pos = 0;
      }

      if (pos < (arv->region()->position() + 64)) {
            fade_length = 64; // this should be a minimum defined somewhere
      } else if (pos > arv->region()->last_frame()) {
            fade_length = arv->region()->length();
      } else {
            fade_length = pos - arv->region()->position();
      }
            
      begin_reversible_command (_("change fade in length"));

      for (RegionSelection::iterator i = selection->regions.begin(); i != selection->regions.end(); ++i) {

            AudioRegionView* tmp = dynamic_cast<AudioRegionView*> (*i);
            
            if (!tmp) {
                  continue;
            }
      
            AutomationList& alist = tmp->audio_region()->fade_in();
            XMLNode &before = alist.get_state();

            tmp->audio_region()->set_fade_in_length (fade_length);
            
            XMLNode &after = alist.get_state();
            session->add_command(new MementoCommand<AutomationList>(alist, &before, &after));
      }

      commit_reversible_command ();
}

void
Editor::start_fade_out_grab (ArdourCanvas::Item* item, GdkEvent* event)
{
      drag_info.item = item;
      drag_info.motion_callback = &Editor::fade_out_drag_motion_callback;
      drag_info.finished_callback = &Editor::fade_out_drag_finished_callback;

      start_grab (event);

      if ((drag_info.data = (item->get_data ("regionview"))) == 0) {
            fatal << _("programming error: fade out canvas item has no regionview data pointer!") << endmsg;
            /*NOTREACHED*/
      }

      AudioRegionView* arv = static_cast<AudioRegionView*>(drag_info.data);

      drag_info.pointer_frame_offset = drag_info.grab_frame - (arv->region()->length() - (nframes_t) arv->audio_region()->fade_out().back()->when + arv->region()->position());     
}

void
Editor::fade_out_drag_motion_callback (ArdourCanvas::Item* item, GdkEvent* event)
{
      AudioRegionView* arv = static_cast<AudioRegionView*>(drag_info.data);
      nframes_t pos;
      nframes_t fade_length;

      if (drag_info.current_pointer_frame > drag_info.pointer_frame_offset) {
            pos = drag_info.current_pointer_frame - drag_info.pointer_frame_offset;
      } else {
            pos = 0;
      }

      if (!Keyboard::modifier_state_contains (event->button.state, Keyboard::snap_modifier())) {
            snap_to (pos);
      }
      
      if (pos > (arv->region()->last_frame() - 64)) {
            fade_length = 64; // this should really be a minimum fade defined somewhere
      }
      else if (pos < arv->region()->position()) {
            fade_length = arv->region()->length();
      }
      else {
            fade_length = arv->region()->last_frame() - pos;
      }
            
      /* mapover the region selection */

      for (RegionSelection::iterator i = selection->regions.begin(); i != selection->regions.end(); ++i) {

            AudioRegionView* tmp = dynamic_cast<AudioRegionView*> (*i);
            
            if (!tmp) {
                  continue;
            }
      
            tmp->reset_fade_out_shape_width (fade_length);
      }

      show_verbose_duration_cursor (arv->region()->last_frame() - fade_length, arv->region()->last_frame(), 10);

      drag_info.first_move = false;
}

void
Editor::fade_out_drag_finished_callback (ArdourCanvas::Item* item, GdkEvent* event)
{
      if (drag_info.first_move) return;

      AudioRegionView* arv = static_cast<AudioRegionView*>(drag_info.data);
      nframes_t pos;
      nframes_t fade_length;

      if (drag_info.current_pointer_frame > drag_info.pointer_frame_offset) {
            pos = drag_info.current_pointer_frame - drag_info.pointer_frame_offset;
      }
      else {
            pos = 0;
      }

      if (!Keyboard::modifier_state_contains (event->button.state, Keyboard::snap_modifier())) {
            snap_to (pos);
      }

      if (pos > (arv->region()->last_frame() - 64)) {
            fade_length = 64; // this should really be a minimum fade defined somewhere
      }
      else if (pos < arv->region()->position()) {
            fade_length = arv->region()->length();
      }
      else {
            fade_length = arv->region()->last_frame() - pos;
      }

      begin_reversible_command (_("change fade out length"));

      for (RegionSelection::iterator i = selection->regions.begin(); i != selection->regions.end(); ++i) {

            AudioRegionView* tmp = dynamic_cast<AudioRegionView*> (*i);
            
            if (!tmp) {
                  continue;
            }
      
            AutomationList& alist = tmp->audio_region()->fade_out();
            XMLNode &before = alist.get_state();
            
            tmp->audio_region()->set_fade_out_length (fade_length);

            XMLNode &after = alist.get_state();
            session->add_command(new MementoCommand<AutomationList>(alist, &before, &after));
      }

      commit_reversible_command ();
}

void
Editor::start_cursor_grab (ArdourCanvas::Item* item, GdkEvent* event)
{
      drag_info.item = item;
      drag_info.motion_callback = &Editor::cursor_drag_motion_callback;
      drag_info.finished_callback = &Editor::cursor_drag_finished_callback;

      start_grab (event);

      if ((drag_info.data = (item->get_data ("cursor"))) == 0) {
            fatal << _("programming error: cursor canvas item has no cursor data pointer!") << endmsg;
            /*NOTREACHED*/
      }

      Cursor* cursor = (Cursor *) drag_info.data;

      if (cursor == playhead_cursor) {
            _dragging_playhead = true;
            
            if (session && drag_info.was_rolling) {
                  session->request_stop ();
            }

            if (session && session->is_auditioning()) {
                  session->cancel_audition ();
            }
      }

      drag_info.pointer_frame_offset = drag_info.grab_frame - cursor->current_frame;      
      
      show_verbose_time_cursor (cursor->current_frame, 10);
}

void
Editor::cursor_drag_motion_callback (ArdourCanvas::Item* item, GdkEvent* event)
{
      Cursor* cursor = (Cursor *) drag_info.data;
      nframes_t adjusted_frame;
      
      if (drag_info.current_pointer_frame > drag_info.pointer_frame_offset) {
            adjusted_frame = drag_info.current_pointer_frame - drag_info.pointer_frame_offset;
      }
      else {
            adjusted_frame = 0;
      }
      
      if (!Keyboard::modifier_state_contains (event->button.state, Keyboard::snap_modifier())) {
            if (cursor != edit_cursor || snap_type != SnapToEditCursor) {
                  snap_to (adjusted_frame);
            }
      }
      
      if (adjusted_frame == drag_info.last_pointer_frame) return;

      cursor->set_position (adjusted_frame);
      
      if (cursor == edit_cursor) {
            edit_cursor_clock.set (cursor->current_frame);
      } else {
            UpdateAllTransportClocks (cursor->current_frame);
      }

      show_verbose_time_cursor (cursor->current_frame, 10);

      drag_info.last_pointer_frame = adjusted_frame;
      drag_info.first_move = false;
}

void
Editor::cursor_drag_finished_callback (ArdourCanvas::Item* item, GdkEvent* event)
{
      if (drag_info.first_move) return;
      
      cursor_drag_motion_callback (item, event);

      _dragging_playhead = false;
      
      if (item == &playhead_cursor->canvas_item) {
            if (session) {
                  session->request_locate (playhead_cursor->current_frame, drag_info.was_rolling);
            }
      } else if (item == &edit_cursor->canvas_item) {
            edit_cursor->set_position (edit_cursor->current_frame);
            edit_cursor_clock.set (edit_cursor->current_frame);
      } 
}

void
Editor::update_marker_drag_item (Location *location)
{
      double x1 = frame_to_pixel (location->start());
      double x2 = frame_to_pixel (location->end());

      if (location->is_mark()) {
              marker_drag_line_points.front().set_x(x1);
            marker_drag_line_points.back().set_x(x1);
            marker_drag_line->property_points() = marker_drag_line_points;
      }
      else {
            range_marker_drag_rect->property_x1() = x1;
            range_marker_drag_rect->property_x2() = x2;
      }
}

void
Editor::start_marker_grab (ArdourCanvas::Item* item, GdkEvent* event)
{
      Marker* marker;

      if ((marker = static_cast<Marker *> (item->get_data ("marker"))) == 0) {
            fatal << _("programming error: marker canvas item has no marker object pointer!") << endmsg;
            /*NOTREACHED*/
      }

      bool is_start;

      Location  *location = find_location_from_marker (marker, is_start);

      drag_info.item = item;
      drag_info.data = marker;
      drag_info.motion_callback = &Editor::marker_drag_motion_callback;
      drag_info.finished_callback = &Editor::marker_drag_finished_callback;

      start_grab (event);

      drag_info.copied_location = new Location (*location);
      drag_info.pointer_frame_offset = drag_info.grab_frame - (is_start ? location->start() : location->end());   

      update_marker_drag_item (location);

      if (location->is_mark()) {
            marker_drag_line->show();
            marker_drag_line->raise_to_top();
      }
      else {
            range_marker_drag_rect->show();
            range_marker_drag_rect->raise_to_top();
      }
      
      if (is_start) show_verbose_time_cursor (location->start(), 10);
      else show_verbose_time_cursor (location->end(), 10);
}

void
Editor::marker_drag_motion_callback (ArdourCanvas::Item* item, GdkEvent* event)
{
      nframes_t f_delta;      
      Marker* marker = (Marker *) drag_info.data;
      Location  *real_location;
      Location  *copy_location;
      bool is_start;
      bool move_both = false;


      nframes_t newframe;
      if (drag_info.pointer_frame_offset <= drag_info.current_pointer_frame) {
            newframe = drag_info.current_pointer_frame - drag_info.pointer_frame_offset;
      } else {
            newframe = 0;
      }

      nframes_t next = newframe;

      if (!Keyboard::modifier_state_contains (event->button.state, Keyboard::snap_modifier())) {
            snap_to (newframe, 0, true);
      }
      
      if (drag_info.current_pointer_frame == drag_info.last_pointer_frame) { 
            return;
      }

      /* call this to find out if its the start or end */
      
      real_location = find_location_from_marker (marker, is_start);

      /* use the copy that we're "dragging" around */
      
      copy_location = drag_info.copied_location;

      f_delta = copy_location->end() - copy_location->start();
      
      if (Keyboard::modifier_state_equals (event->button.state, Keyboard::Control)) {
            move_both = true;
      }

      if (copy_location->is_mark()) {
            /* just move it */

            copy_location->set_start (newframe);

      } else {

            if (is_start) { // start-of-range marker
                  
                  if (move_both) {
                        copy_location->set_start (newframe);
                        copy_location->set_end (newframe + f_delta);
                  } else      if (newframe < copy_location->end()) {
                        copy_location->set_start (newframe);
                  } else { 
                        snap_to (next, 1, true);
                        copy_location->set_end (next);
                        copy_location->set_start (newframe);
                  }
                  
            } else { // end marker
                  
                  if (move_both) {
                        copy_location->set_end (newframe);
                        copy_location->set_start (newframe - f_delta);
                  } else if (newframe > copy_location->start()) {
                        copy_location->set_end (newframe);
                        
                  } else if (newframe > 0) {
                        snap_to (next, -1, true);
                        copy_location->set_start (next);
                        copy_location->set_end (newframe);
                  }
            }
      }

      drag_info.last_pointer_frame = drag_info.current_pointer_frame;
      drag_info.first_move = false;

      update_marker_drag_item (copy_location);

      LocationMarkers* lm = find_location_markers (real_location);
      lm->set_position (copy_location->start(), copy_location->end());
      
      show_verbose_time_cursor (newframe, 10);
}

void
Editor::marker_drag_finished_callback (ArdourCanvas::Item* item, GdkEvent* event)
{
      if (drag_info.first_move) {
            marker_drag_motion_callback (item, event);

      }
      
      Marker* marker = (Marker *) drag_info.data;
      bool is_start;


      begin_reversible_command ( _("move marker") );
      XMLNode &before = session->locations()->get_state();
      
      Location * location = find_location_from_marker (marker, is_start);
      
      if (location) {
            if (location->is_mark()) {
                  location->set_start (drag_info.copied_location->start());
            } else {
                  location->set (drag_info.copied_location->start(), drag_info.copied_location->end());
            }
      }

      XMLNode &after = session->locations()->get_state();
      session->add_command(new MementoCommand<Locations>(*(session->locations()), &before, &after));
      commit_reversible_command ();
      
      marker_drag_line->hide();
      range_marker_drag_rect->hide();
}

void
Editor::start_meter_marker_grab (ArdourCanvas::Item* item, GdkEvent* event)
{
      Marker* marker;
      MeterMarker* meter_marker;

      if ((marker = reinterpret_cast<Marker *> (item->get_data ("marker"))) == 0) {
            fatal << _("programming error: meter marker canvas item has no marker object pointer!") << endmsg;
            /*NOTREACHED*/
      }

      meter_marker = dynamic_cast<MeterMarker*> (marker);

      MetricSection& section (meter_marker->meter());

      if (!section.movable()) {
            return;
      }

      drag_info.item = item;
      drag_info.data = marker;
      drag_info.motion_callback = &Editor::meter_marker_drag_motion_callback;
      drag_info.finished_callback = &Editor::meter_marker_drag_finished_callback;

      start_grab (event);

      drag_info.pointer_frame_offset = drag_info.grab_frame - meter_marker->meter().frame();    

      show_verbose_time_cursor (drag_info.current_pointer_frame, 10);
}

void
Editor::start_meter_marker_copy_grab (ArdourCanvas::Item* item, GdkEvent* event)
{
      Marker* marker;
      MeterMarker* meter_marker;

      if ((marker = reinterpret_cast<Marker *> (item->get_data ("marker"))) == 0) {
            fatal << _("programming error: meter marker canvas item has no marker object pointer!") << endmsg;
            /*NOTREACHED*/
      }

      meter_marker = dynamic_cast<MeterMarker*> (marker);
      
      // create a dummy marker for visual representation of moving the copy.
      // The actual copying is not done before we reach the finish callback.
      char name[64];
      snprintf (name, sizeof(name), "%g/%g", meter_marker->meter().beats_per_bar(), meter_marker->meter().note_divisor ());
      MeterMarker* new_marker = new MeterMarker(*this, *meter_group, ARDOUR_UI::config()->canvasvar_MeterMarker.get(), name, 
                                      *new MeterSection(meter_marker->meter()));

      drag_info.item = &new_marker->the_item();
      drag_info.copy = true;
      drag_info.data = new_marker;
      drag_info.motion_callback = &Editor::meter_marker_drag_motion_callback;
      drag_info.finished_callback = &Editor::meter_marker_drag_finished_callback;

      start_grab (event);

      drag_info.pointer_frame_offset = drag_info.grab_frame - meter_marker->meter().frame();    

      show_verbose_time_cursor (drag_info.current_pointer_frame, 10);
}

void
Editor::meter_marker_drag_motion_callback (ArdourCanvas::Item* item, GdkEvent* event)
{
      MeterMarker* marker = (MeterMarker *) drag_info.data;
      nframes_t adjusted_frame;

      if (drag_info.current_pointer_frame > drag_info.pointer_frame_offset) {
            adjusted_frame = drag_info.current_pointer_frame - drag_info.pointer_frame_offset;
      }
      else {
            adjusted_frame = 0;
      }
      
      if (!Keyboard::modifier_state_contains (event->button.state, Keyboard::snap_modifier())) {
            snap_to (adjusted_frame);
      }
      
      if (adjusted_frame == drag_info.last_pointer_frame) return;

      marker->set_position (adjusted_frame);
      
      
      drag_info.last_pointer_frame = adjusted_frame;
      drag_info.first_move = false;

      show_verbose_time_cursor (adjusted_frame, 10);
}

void
Editor::meter_marker_drag_finished_callback (ArdourCanvas::Item* item, GdkEvent* event)
{
      if (drag_info.first_move) return;

      meter_marker_drag_motion_callback (drag_info.item, event);
      
      MeterMarker* marker = (MeterMarker *) drag_info.data;
      BBT_Time when;
      
      TempoMap& map (session->tempo_map());
      map.bbt_time (drag_info.last_pointer_frame, when);
      
      if (drag_info.copy == true) {
            begin_reversible_command (_("copy meter mark"));
                XMLNode &before = map.get_state();
            map.add_meter (marker->meter(), when);
            XMLNode &after = map.get_state();
                session->add_command(new MementoCommand<TempoMap>(map, &before, &after));
            commit_reversible_command ();
            
            // delete the dummy marker we used for visual representation of copying.
            // a new visual marker will show up automatically.
            delete marker;
      } else {
            begin_reversible_command (_("move meter mark"));
            XMLNode &before = map.get_state();
            map.move_meter (marker->meter(), when);
            XMLNode &after = map.get_state();
                session->add_command(new MementoCommand<TempoMap>(map, &before, &after));
            commit_reversible_command ();
      }
}

void
Editor::start_tempo_marker_grab (ArdourCanvas::Item* item, GdkEvent* event)
{
      Marker* marker;
      TempoMarker* tempo_marker;

      if ((marker = reinterpret_cast<Marker *> (item->get_data ("marker"))) == 0) {
            fatal << _("programming error: tempo marker canvas item has no marker object pointer!") << endmsg;
            /*NOTREACHED*/
      }

      if ((tempo_marker = dynamic_cast<TempoMarker *> (marker)) == 0) {
            fatal << _("programming error: marker for tempo is not a tempo marker!") << endmsg;
            /*NOTREACHED*/
      }

      MetricSection& section (tempo_marker->tempo());

      if (!section.movable()) {
            return;
      }

      drag_info.item = item;
      drag_info.data = marker;
      drag_info.motion_callback = &Editor::tempo_marker_drag_motion_callback;
      drag_info.finished_callback = &Editor::tempo_marker_drag_finished_callback;

      start_grab (event);

      drag_info.pointer_frame_offset = drag_info.grab_frame - tempo_marker->tempo().frame();    
      show_verbose_time_cursor (drag_info.current_pointer_frame, 10);
}

void
Editor::start_tempo_marker_copy_grab (ArdourCanvas::Item* item, GdkEvent* event)
{
      Marker* marker;
      TempoMarker* tempo_marker;

      if ((marker = reinterpret_cast<Marker *> (item->get_data ("marker"))) == 0) {
            fatal << _("programming error: tempo marker canvas item has no marker object pointer!") << endmsg;
            /*NOTREACHED*/
      }

      if ((tempo_marker = dynamic_cast<TempoMarker *> (marker)) == 0) {
            fatal << _("programming error: marker for tempo is not a tempo marker!") << endmsg;
            /*NOTREACHED*/
      }

      // create a dummy marker for visual representation of moving the copy.
      // The actual copying is not done before we reach the finish callback.
      char name[64];
      snprintf (name, sizeof (name), "%.2f", tempo_marker->tempo().beats_per_minute());
      TempoMarker* new_marker = new TempoMarker(*this, *tempo_group, ARDOUR_UI::config()->canvasvar_TempoMarker.get(), name, 
                                      *new TempoSection(tempo_marker->tempo()));

      drag_info.item = &new_marker->the_item();
      drag_info.copy = true;
      drag_info.data = new_marker;
      drag_info.motion_callback = &Editor::tempo_marker_drag_motion_callback;
      drag_info.finished_callback = &Editor::tempo_marker_drag_finished_callback;

      start_grab (event);

      drag_info.pointer_frame_offset = drag_info.grab_frame - tempo_marker->tempo().frame();

      show_verbose_time_cursor (drag_info.current_pointer_frame, 10);
}

void
Editor::tempo_marker_drag_motion_callback (ArdourCanvas::Item* item, GdkEvent* event)
{
      TempoMarker* marker = (TempoMarker *) drag_info.data;
      nframes_t adjusted_frame;
      
      if (drag_info.current_pointer_frame > drag_info.pointer_frame_offset) {
            adjusted_frame = drag_info.current_pointer_frame - drag_info.pointer_frame_offset;
      }
      else {
            adjusted_frame = 0;
      }

      if (!Keyboard::modifier_state_contains (event->button.state, Keyboard::snap_modifier())) {
            snap_to (adjusted_frame);
      }
      
      if (adjusted_frame == drag_info.last_pointer_frame) return;

      /* OK, we've moved far enough to make it worth actually move the thing. */
            
      marker->set_position (adjusted_frame);
      
      show_verbose_time_cursor (adjusted_frame, 10);

      drag_info.last_pointer_frame = adjusted_frame;
      drag_info.first_move = false;
}

void
Editor::tempo_marker_drag_finished_callback (ArdourCanvas::Item* item, GdkEvent* event)
{
      if (drag_info.first_move) return;
      
      tempo_marker_drag_motion_callback (drag_info.item, event);
      
      TempoMarker* marker = (TempoMarker *) drag_info.data;
      BBT_Time when;
      
      TempoMap& map (session->tempo_map());
      map.bbt_time (drag_info.last_pointer_frame, when);

      if (drag_info.copy == true) {
            begin_reversible_command (_("copy tempo mark"));
            XMLNode &before = map.get_state();
            map.add_tempo (marker->tempo(), when);
            XMLNode &after = map.get_state();
            session->add_command (new MementoCommand<TempoMap>(map, &before, &after));
            commit_reversible_command ();
            
            // delete the dummy marker we used for visual representation of copying.
            // a new visual marker will show up automatically.
            delete marker;
      } else {
            begin_reversible_command (_("move tempo mark"));
                XMLNode &before = map.get_state();
            map.move_tempo (marker->tempo(), when);
                XMLNode &after = map.get_state();
                session->add_command (new MementoCommand<TempoMap>(map, &before, &after));
            commit_reversible_command ();
      }
}

void
Editor::remove_gain_control_point (ArdourCanvas::Item*item, GdkEvent* event)
{
      ControlPoint* control_point;

      if ((control_point = reinterpret_cast<ControlPoint *> (item->get_data ("control_point"))) == 0) {
            fatal << _("programming error: control point canvas item has no control point object pointer!") << endmsg;
            /*NOTREACHED*/
      }

      // We shouldn't remove the first or last gain point
      if (control_point->line.is_last_point(*control_point) ||
            control_point->line.is_first_point(*control_point)) { 
            return;
      }

      control_point->line.remove_point (*control_point);
}

void
Editor::remove_control_point (ArdourCanvas::Item*item, GdkEvent* event)
{
      ControlPoint* control_point;

      if ((control_point = reinterpret_cast<ControlPoint *> (item->get_data ("control_point"))) == 0) {
            fatal << _("programming error: control point canvas item has no control point object pointer!") << endmsg;
            /*NOTREACHED*/
      }

      control_point->line.remove_point (*control_point);
}

void
Editor::start_control_point_grab (ArdourCanvas::Item* item, GdkEvent* event)
{
      ControlPoint* control_point;
      
      if ((control_point = reinterpret_cast<ControlPoint *> (item->get_data ("control_point"))) == 0) {
            fatal << _("programming error: control point canvas item has no control point object pointer!") << endmsg;
            /*NOTREACHED*/
      }

      drag_info.item = item;
      drag_info.data = control_point;
      drag_info.motion_callback = &Editor::control_point_drag_motion_callback;
      drag_info.finished_callback = &Editor::control_point_drag_finished_callback;

      start_grab (event, fader_cursor);

      control_point->line.start_drag (control_point, drag_info.grab_frame, 0);

      float fraction = 1.0 - (control_point->get_y() / control_point->line.height());
      set_verbose_canvas_cursor (control_point->line.get_verbose_cursor_string (fraction), 
                           drag_info.current_pointer_x + 20, drag_info.current_pointer_y + 20);

      show_verbose_canvas_cursor ();
}

void
Editor::control_point_drag_motion_callback (ArdourCanvas::Item* item, GdkEvent* event)
{
      ControlPoint* cp = reinterpret_cast<ControlPoint *> (drag_info.data);

      double cx = drag_info.current_pointer_x;
      double cy = drag_info.current_pointer_y;

      drag_info.cumulative_x_drag = cx - drag_info.grab_x ;
      drag_info.cumulative_y_drag = cy - drag_info.grab_y ;

      if (drag_info.x_constrained) {
            cx = drag_info.grab_x;
      }
      if (drag_info.y_constrained) {
            cy = drag_info.grab_y;
      }

      cp->line.parent_group().w2i (cx, cy);

      cx = max (0.0, cx);
      cy = max (0.0, cy);
      cy = min ((double) cp->line.height(), cy);

      //translate cx to frames
      nframes_t cx_frames = unit_to_frame (cx);

      if (!Keyboard::modifier_state_contains (event->button.state, Keyboard::snap_modifier()) && !drag_info.x_constrained) {
            snap_to (cx_frames);
      }

      float fraction = 1.0 - (cy / cp->line.height());
      
      bool push;

      if (Keyboard::modifier_state_contains (event->button.state, Keyboard::Control)) {
            push = true;
      } else {
            push = false;
      }

      cp->line.point_drag (*cp, cx_frames , fraction, push);
      
      set_verbose_canvas_cursor_text (cp->line.get_verbose_cursor_string (fraction));

      drag_info.first_move = false;
}

void
Editor::control_point_drag_finished_callback (ArdourCanvas::Item* item, GdkEvent* event)
{
      ControlPoint* cp = reinterpret_cast<ControlPoint *> (drag_info.data);

      if (drag_info.first_move) {

            /* just a click */
            
            if ((event->type == GDK_BUTTON_RELEASE) && (event->button.button == 1) && Keyboard::modifier_state_equals (event->button.state, Keyboard::Shift)) {
                  reset_point_selection ();
            }

      } else {
            control_point_drag_motion_callback (item, event);
      }
      cp->line.end_drag (cp);
}

void
Editor::start_line_grab_from_regionview (ArdourCanvas::Item* item, GdkEvent* event)
{
      switch (mouse_mode) {
      case MouseGain:
            assert(dynamic_cast<AudioRegionView*>(clicked_regionview));
            start_line_grab (dynamic_cast<AudioRegionView*>(clicked_regionview)->get_gain_line(), event);
            break;
      default:
            break;
      }
}

void
Editor::start_line_grab_from_line (ArdourCanvas::Item* item, GdkEvent* event)
{
      AutomationLine* al;
      
      if ((al = reinterpret_cast<AutomationLine*> (item->get_data ("line"))) == 0) {
            fatal << _("programming error: line canvas item has no line pointer!") << endmsg;
            /*NOTREACHED*/
      }

      start_line_grab (al, event);
}

void
Editor::start_line_grab (AutomationLine* line, GdkEvent* event)
{
      double cx;
      double cy;
      nframes_t frame_within_region;

      /* need to get x coordinate in terms of parent (TimeAxisItemView)
         origin.
      */

      cx = event->button.x;
      cy = event->button.y;
      line->parent_group().w2i (cx, cy);
      frame_within_region = (nframes_t) floor (cx * frames_per_unit);

      if (!line->control_points_adjacent (frame_within_region, current_line_drag_info.before, 
                                  current_line_drag_info.after)) {
            /* no adjacent points */
            return;
      }

      drag_info.item = &line->grab_item();
      drag_info.data = line;
      drag_info.motion_callback = &Editor::line_drag_motion_callback;
      drag_info.finished_callback = &Editor::line_drag_finished_callback;

      start_grab (event, fader_cursor);

      double fraction = 1.0 - (cy / line->height());

      line->start_drag (0, drag_info.grab_frame, fraction);
      
      set_verbose_canvas_cursor (line->get_verbose_cursor_string (fraction),
                           drag_info.current_pointer_x + 20, drag_info.current_pointer_y + 20);
      show_verbose_canvas_cursor ();
}

void
Editor::line_drag_motion_callback (ArdourCanvas::Item* item, GdkEvent* event)
{
      AutomationLine* line = reinterpret_cast<AutomationLine *> (drag_info.data);
      double cx = drag_info.current_pointer_x;
      double cy = drag_info.current_pointer_y;

      line->parent_group().w2i (cx, cy);
      
      double fraction;
      fraction = 1.0 - (cy / line->height());

      bool push;

      if (Keyboard::modifier_state_contains (event->button.state, Keyboard::Control)) {
            push = false;
      } else {
            push = true;
      }

      line->line_drag (current_line_drag_info.before, current_line_drag_info.after, fraction, push);
      
      set_verbose_canvas_cursor_text (line->get_verbose_cursor_string (fraction));
}

void
Editor::line_drag_finished_callback (ArdourCanvas::Item* item, GdkEvent* event)
{
      AutomationLine* line = reinterpret_cast<AutomationLine *> (drag_info.data);
      line_drag_motion_callback (item, event);
      line->end_drag (0);
}

void
Editor::start_region_grab (ArdourCanvas::Item* item, GdkEvent* event)
{
      if (selection->regions.empty() || clicked_regionview == 0) {
            return;
      }

      drag_info.copy = false;
      drag_info.item = item;
      drag_info.data = clicked_regionview;
      drag_info.motion_callback = &Editor::region_drag_motion_callback;
      drag_info.finished_callback = &Editor::region_drag_finished_callback;

      start_grab (event);

      double speed = 1.0;
      TimeAxisView* tvp = clicked_trackview;
      RouteTimeAxisView* tv = dynamic_cast<RouteTimeAxisView*>(tvp);

      if (tv && tv->is_audio_track()) {
            speed = tv->get_diskstream()->speed();
      }
      
      drag_info.last_frame_position = (nframes_t) (clicked_regionview->region()->position() / speed);
      drag_info.pointer_frame_offset = drag_info.grab_frame - drag_info.last_frame_position;
      drag_info.last_trackview = &clicked_regionview->get_time_axis_view();
      // we want a move threshold
      drag_info.want_move_threshold = true;
      
      show_verbose_time_cursor (drag_info.last_frame_position, 10);

      begin_reversible_command (_("move region(s)"));
}

void
Editor::start_region_copy_grab (ArdourCanvas::Item* item, GdkEvent* event)
{
      if (selection->regions.empty() || clicked_regionview == 0) {
            return;
      }

      drag_info.copy = true;
      drag_info.item = item;
      drag_info.data = clicked_regionview;      

      start_grab(event);

      TimeAxisView* tv = &clicked_regionview->get_time_axis_view();
      RouteTimeAxisView* atv = dynamic_cast<RouteTimeAxisView*>(tv);
      double speed = 1.0;

      if (atv && atv->is_audio_track()) {
            speed = atv->get_diskstream()->speed();
      }
      
      drag_info.last_trackview = &clicked_regionview->get_time_axis_view();
      drag_info.last_frame_position = (nframes_t) (clicked_regionview->region()->position() / speed);
      drag_info.pointer_frame_offset = drag_info.grab_frame - drag_info.last_frame_position;
      // we want a move threshold
      drag_info.want_move_threshold = true;
      drag_info.motion_callback = &Editor::region_drag_motion_callback;
      drag_info.finished_callback = &Editor::region_drag_finished_callback;
      show_verbose_time_cursor (drag_info.last_frame_position, 10);
}

void
Editor::start_region_brush_grab (ArdourCanvas::Item* item, GdkEvent* event)
{
      if (selection->regions.empty() || clicked_regionview == 0) {
            return;
      }

      drag_info.copy = false;
      drag_info.item = item;
      drag_info.data = clicked_regionview;
      drag_info.motion_callback = &Editor::region_drag_motion_callback;
      drag_info.finished_callback = &Editor::region_drag_finished_callback;

      start_grab (event);

      double speed = 1.0;
      TimeAxisView* tvp = clicked_trackview;
      RouteTimeAxisView* tv = dynamic_cast<RouteTimeAxisView*>(tvp);

      if (tv && tv->is_audio_track()) {
            speed = tv->get_diskstream()->speed();
      }
      
      drag_info.last_frame_position = (nframes_t) (clicked_regionview->region()->position() / speed);
      drag_info.pointer_frame_offset = drag_info.grab_frame - drag_info.last_frame_position;
      drag_info.last_trackview = &clicked_regionview->get_time_axis_view();
      // we want a move threshold
      drag_info.want_move_threshold = true;
      drag_info.brushing = true;
      
      begin_reversible_command (_("Drag region brush"));
}

void
Editor::region_drag_motion_callback (ArdourCanvas::Item* item, GdkEvent* event)
{
      double x_delta;
      double y_delta = 0;
      RegionView* rv = reinterpret_cast<RegionView*> (drag_info.data); 
      nframes_t pending_region_position = 0;
      int32_t pointer_y_span = 0, canvas_pointer_y_span = 0, original_pointer_order;
      int32_t visible_y_high = 0, visible_y_low = 512;  //high meaning higher numbered.. not the height on the screen
      bool clamp_y_axis = false;
      vector<int32_t>  height_list(512) ;
      vector<int32_t>::iterator j;

      if (drag_info.copy && drag_info.move_threshold_passed && drag_info.want_move_threshold) {

            drag_info.want_move_threshold = false; // don't copy again

            /* duplicate the region(s) */

            vector<RegionView*> new_regionviews;
            
            for (list<RegionView*>::const_iterator i = selection->regions.by_layer().begin(); i != selection->regions.by_layer().end(); ++i) {
                  RegionView* rv;
                  RegionView* nrv;
                  AudioRegionView* arv;

                  rv = (*i);

                  
                  if ((arv = dynamic_cast<AudioRegionView*>(rv)) == 0) {
                        /* XXX handle MIDI here */
                        continue;
                  }

                  nrv = new AudioRegionView (*arv);
                  nrv->get_canvas_group()->show ();

                  new_regionviews.push_back (nrv);
            }

            if (new_regionviews.empty()) {
                  return;
            }

            /* reset selection to new regionviews */
            
            selection->set (new_regionviews);
            
            /* reset drag_info data to reflect the fact that we are dragging the copies */
            
            drag_info.data = new_regionviews.front();

            swap_grab (new_regionviews.front()->get_canvas_group (), 0, event->motion.time);
      }

      /* Which trackview is this ? */

      TimeAxisView* tvp = trackview_by_y_position (drag_info.current_pointer_y);
      AudioTimeAxisView* tv = dynamic_cast<AudioTimeAxisView*>(tvp);

      /* The region motion is only processed if the pointer is over
         an audio track.
      */
      
      if (!tv || !tv->is_audio_track()) {
            /* To make sure we hide the verbose canvas cursor when the mouse is 
               not held over and audiotrack. 
            */
            hide_verbose_canvas_cursor ();
            return;
      }
      
      original_pointer_order = drag_info.last_trackview->order;
            
      /************************************************************
                 Y-Delta Computation
      ************************************************************/     

      if (drag_info.brushing) {
            clamp_y_axis = true;
            pointer_y_span = 0;
            goto y_axis_done;
      }
      
      if ((pointer_y_span = (drag_info.last_trackview->order - tv->order)) != 0) {

            int32_t children = 0, numtracks = 0;
            // XXX hard coding track limit, oh my, so very very bad
            bitset <1024> tracks (0x00);
            /* get a bitmask representing the visible tracks */

            for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
                  TimeAxisView *tracklist_timeview;
                  tracklist_timeview = (*i);
                  AudioTimeAxisView* atv2 = dynamic_cast<AudioTimeAxisView*>(tracklist_timeview);
                  list<TimeAxisView*> children_list;
            
                  /* zeroes are audio tracks. ones are other types. */
            
                  if (!atv2->hidden()) {
                        
                        if (visible_y_high < atv2->order) {
                              visible_y_high = atv2->order;
                        }
                        if (visible_y_low > atv2->order) {
                              visible_y_low = atv2->order;
                        }
            
                        if (!atv2->is_audio_track()) {                          
                              tracks = tracks |= (0x01 << atv2->order);
                        }
      
                        height_list[atv2->order] = (*i)->height;
                        children = 1;
                        if ((children_list = atv2->get_child_list()).size() > 0) {
                              for (list<TimeAxisView*>::iterator j = children_list.begin(); j != children_list.end(); ++j) { 
                                    tracks = tracks |= (0x01 << (atv2->order + children));
                                    height_list[atv2->order + children] =  (*j)->height;            
                                    numtracks++;
                                    children++; 
                              }
                        }
                        numtracks++;          
                  }
            }
            /* find the actual span according to the canvas */

            canvas_pointer_y_span = pointer_y_span;
            if (drag_info.last_trackview->order >= tv->order) {
                  int32_t y;
                  for (y = tv->order; y < drag_info.last_trackview->order; y++) {
                        if (height_list[y] == 0 ) {
                              canvas_pointer_y_span--;
                        }
                  }
            } else {
                  int32_t y;
                  for (y = drag_info.last_trackview->order;y <= tv->order; y++) {
                        if (  height_list[y] == 0 ) {
                              canvas_pointer_y_span++;
                        }
                  }
            }

            for (list<RegionView*>::const_iterator i = selection->regions.by_layer().begin(); i != selection->regions.by_layer().end(); ++i) {
                  RegionView* rv2 = (*i);
                  double ix1, ix2, iy1, iy2;
                  int32_t n = 0;

                  rv2->get_canvas_frame()->get_bounds (ix1, iy1, ix2, iy2);
                  rv2->get_canvas_group()->i2w (ix1, iy1);
                  TimeAxisView* tvp2 = trackview_by_y_position (iy1);
                  RouteTimeAxisView* atv2 = dynamic_cast<RouteTimeAxisView*>(tvp2);

                  if (atv2->order != original_pointer_order) {    
                        /* this isn't the pointer track */  

                        if (canvas_pointer_y_span > 0) {

                              /* moving up the canvas */
                              if ((atv2->order - canvas_pointer_y_span) >= visible_y_low) {
      
                                    int32_t visible_tracks = 0;
                                    while (visible_tracks < canvas_pointer_y_span ) {
                                          visible_tracks++;
              
                                          while (height_list[atv2->order - (visible_tracks - n)] == 0) {
                                                /* we're passing through a hidden track */
                                                n--;
                                          }             
                                    }
             
                                    if (tracks[atv2->order - (canvas_pointer_y_span - n)] != 0x00) {          
                                          clamp_y_axis = true;
                                    }
                
                              } else {
                                    clamp_y_axis = true;
                              }             
              
                        } else if (canvas_pointer_y_span < 0) {

                              /*moving down the canvas*/

                              if ((atv2->order - (canvas_pointer_y_span - n)) <= visible_y_high) { // we will overflow
                
                
                                    int32_t visible_tracks = 0;
                
                                    while (visible_tracks > canvas_pointer_y_span ) {
                                          visible_tracks--;
                  
                                          while (height_list[atv2->order - (visible_tracks - n)] == 0) {             
                                                n++;
                                          }            
                                    }
                                    if (  tracks[atv2->order - ( canvas_pointer_y_span - n)] != 0x00) {
                                          clamp_y_axis = true;
                      
                                    }
                              } else {
                    
                                    clamp_y_axis = true;
                              }
                        }           
              
                  } else {
                  
                        /* this is the pointer's track */
                        if ((atv2->order - pointer_y_span) > visible_y_high) { // we will overflow 
                              clamp_y_axis = true;
                        } else if ((atv2->order - pointer_y_span) < visible_y_low) { // we will underflow
                              clamp_y_axis = true;
                        }
                  }           
                  if (clamp_y_axis) {
                        break;
                  }
            }

      } else  if (drag_info.last_trackview == tv) {
            clamp_y_axis = true;
      }       

  y_axis_done:
      if (!clamp_y_axis) {
            drag_info.last_trackview = tv;            
      }
        
      /************************************************************
                      X DELTA COMPUTATION
      ************************************************************/

      /* compute the amount of pointer motion in frames, and where
         the region would be if we moved it by that much.
      */

      if (drag_info.move_threshold_passed) {

            if (drag_info.current_pointer_frame > drag_info.pointer_frame_offset) {

                  nframes_t sync_frame;
                  nframes_t sync_offset;
                  int32_t sync_dir;
          
                  pending_region_position = drag_info.current_pointer_frame - drag_info.pointer_frame_offset;

                  sync_offset = rv->region()->sync_offset (sync_dir);
                  sync_frame = rv->region()->adjust_to_sync (pending_region_position);

                  /* we snap if the snap modifier is not enabled.
                   */
          
                  if (!Keyboard::modifier_state_contains (event->button.state, Keyboard::snap_modifier())) {
                        snap_to (sync_frame);   
                  }
          
                  if (sync_frame - sync_offset <= sync_frame) {
                        pending_region_position = sync_frame - (sync_dir*sync_offset);
                  } else {
                        pending_region_position = 0;
                  }
          
            } else {
                  pending_region_position = 0;
            }
        
            if (pending_region_position > max_frames - rv->region()->length()) {
                  pending_region_position = drag_info.last_frame_position;
            }
        
            // printf ("3: pending_region_position= %lu    %lu\n", pending_region_position, drag_info.last_frame_position );
        
            if (pending_region_position != drag_info.last_frame_position && !drag_info.x_constrained) {

                  /* now compute the canvas unit distance we need to move the regiondrag_info.last_trackview->order
                     to make it appear at the new location.
                  */

                  if (pending_region_position > drag_info.last_frame_position) {
                        x_delta = ((double) (pending_region_position - drag_info.last_frame_position) / frames_per_unit);
                  } else {
                        x_delta = -((double) (drag_info.last_frame_position - pending_region_position) / frames_per_unit);
                  }

                  drag_info.last_frame_position = pending_region_position;
          
            } else {
                  x_delta = 0;
            }

      } else {
            /* threshold not passed */

            x_delta = 0;
      }

      /*************************************************************
                        PREPARE TO MOVE
      ************************************************************/

      if (x_delta == 0 && (pointer_y_span == 0)) {
            /* haven't reached next snap point, and we're not switching
               trackviews. nothing to do.
            */
            return;
      } 


      if (x_delta < 0) {
            for (list<RegionView*>::const_iterator i = selection->regions.by_layer().begin(); i != selection->regions.by_layer().end(); ++i) {

                  RegionView* rv2 = (*i);

                  // If any regionview is at zero, we need to know so we can stop further leftward motion.
                  
                  double ix1, ix2, iy1, iy2;
                  rv2->get_canvas_frame()->get_bounds (ix1, iy1, ix2, iy2);
                  rv2->get_canvas_group()->i2w (ix1, iy1);

                  if (ix1 <= 1) {
                        x_delta = 0;
                        break;
                  }
            }
      }

      /*************************************************************
                        MOTION                                                      
      ************************************************************/

      bool do_move;

      if (drag_info.first_move) {
            if (drag_info.move_threshold_passed) {
                  do_move = true;
            } else {
                  do_move = false;
            }
      } else {
            do_move = true;
      }

      if (do_move) {

            pair<set<boost::shared_ptr<Playlist> >::iterator,bool> insert_result;
            const list<RegionView*>& layered_regions = selection->regions.by_layer();

            for (list<RegionView*>::const_iterator i = layered_regions.begin(); i != layered_regions.end(); ++i) {
          
                  RegionView* rv = (*i);
                  double ix1, ix2, iy1, iy2;
                  int32_t temp_pointer_y_span = pointer_y_span;

                  /* get item BBox, which will be relative to parent. so we have
                     to query on a child, then convert to world coordinates using
                     the parent.
                  */

                  rv->get_canvas_frame()->get_bounds (ix1, iy1, ix2, iy2);
                  rv->get_canvas_group()->i2w (ix1, iy1);
                  TimeAxisView* tvp2 = trackview_by_y_position (iy1);
                  AudioTimeAxisView* canvas_atv = dynamic_cast<AudioTimeAxisView*>(tvp2);
                  AudioTimeAxisView* temp_atv;

                  if ((pointer_y_span != 0) && !clamp_y_axis) {
                        y_delta = 0;
                        int32_t x = 0;
                        for (j = height_list.begin(); j!= height_list.end(); j++) { 
                              if (x == canvas_atv->order) {
                                    /* we found the track the region is on */
                                    if (x != original_pointer_order) {
                                          /*this isn't from the same track we're dragging from */
                                          temp_pointer_y_span = canvas_pointer_y_span;
                                    }             
                                    while (temp_pointer_y_span > 0) {
                                          /* we're moving up canvas-wise,
                                             so  we need to find the next track height
                                          */
                                          if (j != height_list.begin()) {             
                                                j--;
                                          }
                                          if (x != original_pointer_order) { 
                                                /* we're not from the dragged track, so ignore hidden tracks. */        
                                                if ((*j) == 0) {
                                                      temp_pointer_y_span++;
                                                }
                                          }        
                                          y_delta -= (*j);  
                                          temp_pointer_y_span--;  
                                    }
                                    while (temp_pointer_y_span < 0) {           
                                          y_delta += (*j);
                                          if (x != original_pointer_order) { 
                                                if ((*j) == 0) {
                                                      temp_pointer_y_span--;
                                                }
                                          }        
                
                                          if (j != height_list.end()) {             
                                                j++;
                                          }
                                          temp_pointer_y_span++;
                                    }
                                    /* find out where we'll be when we move and set height accordingly */
              
                                    tvp2 = trackview_by_y_position (iy1 + y_delta);
                                    temp_atv = dynamic_cast<AudioTimeAxisView*>(tvp2);
                                    rv->set_height (temp_atv->height);
      
                                    /*   if you un-comment the following, the region colours will follow the track colours whilst dragging,
                                         personally, i think this can confuse things, but never mind.
                                    */
                          
                                    //const GdkColor& col (temp_atv->view->get_region_color());
                                    //rv->set_color (const_cast<GdkColor&>(col));
                                    break;            
                              }
                              x++;
                        }
                  }
        
                  /* prevent the regionview from being moved to before 
                     the zero position on the canvas.
                  */
                  /* clamp */
            
                  if (x_delta < 0) {
                        if (-x_delta > ix1) {
                              x_delta = -ix1;
                        }
                  } else if ((x_delta > 0) && (rv->region()->last_frame() > max_frames - x_delta)) {
                        x_delta = max_frames - rv->region()->last_frame();
                  }


                  if (drag_info.first_move) {

                        /* hide any dependent views */
                  
                        rv->get_time_axis_view().hide_dependent_views (*rv);
                  
                        /* this is subtle. raising the regionview itself won't help,
                           because raise_to_top() just puts the item on the top of
                           its parent's stack. so, we need to put the trackview canvas_display group
                           on the top, since its parent is the whole canvas.
                        */
                  
                        rv->get_canvas_group()->raise_to_top();
                        rv->get_time_axis_view().canvas_display->raise_to_top();
                        cursor_group->raise_to_top();
                        rv->fake_set_opaque (true);
                  }
                  
                  if (drag_info.brushing) {
                        mouse_brush_insert_region (rv, pending_region_position);
                  } else {
                        rv->move (x_delta, y_delta);              
                  }

            } /* foreach region */

      } /* if do_move */

      if (drag_info.first_move && drag_info.move_threshold_passed) {
            cursor_group->raise_to_top();
            drag_info.first_move = false;
      }

      if (x_delta != 0 && !drag_info.brushing) {
            show_verbose_time_cursor (drag_info.last_frame_position, 10);
      }
} 

void
Editor::region_drag_finished_callback (ArdourCanvas::Item* item, GdkEvent* event)
{
      nframes_t where;
      RegionView* rv = reinterpret_cast<RegionView *> (drag_info.data);
      pair<set<boost::shared_ptr<Playlist> >::iterator,bool> insert_result;
      bool nocommit = true;
      double speed;
      RouteTimeAxisView* atv;
      bool regionview_y_movement;
      bool regionview_x_movement;
      vector<RegionView*> copies;

      /* first_move is set to false if the regionview has been moved in the 
         motion handler. 
      */

      if (drag_info.first_move) {
            /* just a click */
            goto out;
      }

      nocommit = false;

      /* The regionview has been moved at some stage during the grab so we need
         to account for any mouse movement between this event and the last one. 
      */    

      region_drag_motion_callback (item, event);

      if (drag_info.brushing) {
            /* all changes were made during motion event handlers */
            
            if (drag_info.copy) {
                  for (list<RegionView*>::iterator i = selection->regions.begin(); i != selection->regions.end(); ++i) {
                        copies.push_back (*i);
                  }
            }

            goto out;
      }

      /* adjust for track speed */
      speed = 1.0;

      atv = dynamic_cast<AudioTimeAxisView*> (drag_info.last_trackview);
      if (atv && atv->get_diskstream()) {
            speed = atv->get_diskstream()->speed();
      }
      
      regionview_x_movement = (drag_info.last_frame_position != (nframes_t) (rv->region()->position()/speed));
      regionview_y_movement = (drag_info.last_trackview != &rv->get_time_axis_view());

      //printf ("last_frame: %s position is %lu  %g\n", rv->get_time_axis_view().name().c_str(), drag_info.last_frame_position, speed); 
      //printf ("last_rackview: %s \n", drag_info.last_trackview->name().c_str()); 
      
      char* op_string;

      if (drag_info.copy) {
            if (drag_info.x_constrained) {
                  op_string = _("fixed time region copy");
            } else {
                  op_string = _("region copy");
            } 
      } else {
            if (drag_info.x_constrained) {
                  op_string = _("fixed time region drag");
            } else {
                  op_string = _("region drag");
            }
      }

      begin_reversible_command (op_string);

      if (regionview_y_movement) {

            /* moved to a different audio track. */
            
            vector<RegionView*> new_selection;

            for (list<RegionView*>::const_iterator i = selection->regions.by_layer().begin(); i != selection->regions.by_layer().end(); ) {
                  
                  RegionView* rv = (*i);            

                  double ix1, ix2, iy1, iy2;
                  
                  rv->get_canvas_frame()->get_bounds (ix1, iy1, ix2, iy2);
                  rv->get_canvas_group()->i2w (ix1, iy1);
                  TimeAxisView* tvp2 = trackview_by_y_position (iy1);
                  AudioTimeAxisView* atv2 = dynamic_cast<AudioTimeAxisView*>(tvp2);

                  boost::shared_ptr<Playlist> from_playlist = rv->region()->playlist();
                  boost::shared_ptr<Playlist> to_playlist = atv2->playlist();

                  where = (nframes_t) (unit_to_frame (ix1) * speed);
                  boost::shared_ptr<Region> new_region (RegionFactory::create (rv->region()));

                  /* undo the previous hide_dependent_views so that xfades don't
                     disappear on copying regions 
                  */

                  rv->get_time_axis_view().reveal_dependent_views (*rv);

                  if (!drag_info.copy) {
                        
                        /* the region that used to be in the old playlist is not
                           moved to the new one - we make a copy of it. as a result,
                           any existing editor for the region should no longer be
                           visible.
                        */ 
          
                        rv->hide_region_editor();
                        rv->fake_set_opaque (false);

                        session->add_command (new MementoCommand<Playlist>(*from_playlist, &from_playlist->get_state(), 0));  
                        from_playlist->remove_region ((rv->region()));
                        session->add_command (new MementoCommand<Playlist>(*from_playlist, 0, &from_playlist->get_state()));  

                  } else {

                        /* the regionview we dragged around is a temporary copy, queue it for deletion */
                        
                        copies.push_back (rv);
                  }

                  latest_regionview = 0;
                  
                  sigc::connection c = atv2->view()->RegionViewAdded.connect (mem_fun(*this, &Editor::collect_new_region_view));
                  session->add_command (new MementoCommand<Playlist>(*to_playlist, &to_playlist->get_state(), 0));      
                  to_playlist->add_region (new_region, where);
                  session->add_command (new MementoCommand<Playlist>(*to_playlist, 0, &to_playlist->get_state()));      
                  c.disconnect ();
                                                
                  if (latest_regionview) {
                        new_selection.push_back (latest_regionview);
                  }

                  /* OK, this is where it gets tricky. If the playlist was being used by >1 tracks, and the region
                     was selected in all of them, then removing it from the playlist will have removed all
                     trace of it from the selection (i.e. there were N regions selected, we removed 1,
                     but since its the same playlist for N tracks, all N tracks updated themselves, removed the
                     corresponding regionview, and the selection is now empty).

                     this could have invalidated any and all iterators into the region selection.

                     the heuristic we use here is: if the region selection is empty, break out of the loop
                     here. if the region selection is not empty, then restart the loop because we know that
                     we must have removed at least the region(view) we've just been working on as well as any
                     that we processed on previous iterations.

                     EXCEPT .... if we are doing a copy drag, then the selection hasn't been modified and
                     we can just iterate.
                  */

                  if (drag_info.copy) {
                        ++i;
                  } else {
                        if (selection->regions.empty()) {
                              break;
                        } else { 
                              i = selection->regions.by_layer().begin();
                        }
                  }
            } 

            selection->set (new_selection);

      } else {

            /* motion within a single track */

            list<RegionView*> regions = selection->regions.by_layer();

            if (drag_info.copy) {
                  selection->clear_regions();
            }
            
            for (list<RegionView*>::iterator i = regions.begin(); i != regions.end(); ++i) {

                  rv = (*i);

                  if (rv->region()->locked()) {
                        continue;
                  }
                  

                  if (regionview_x_movement) {
                        double ownspeed = 1.0;
                        atv = dynamic_cast<AudioTimeAxisView*> (&(rv->get_time_axis_view()));

                        if (atv && atv->get_diskstream()) {
                              ownspeed = atv->get_diskstream()->speed();
                        }
                        
                        /* base the new region position on the current position of the regionview.*/
                        
                        double ix1, ix2, iy1, iy2;
                        
                        rv->get_canvas_frame()->get_bounds (ix1, iy1, ix2, iy2);
                        rv->get_canvas_group()->i2w (ix1, iy1);
                        where = (nframes_t) (unit_to_frame (ix1) * ownspeed);
                        
                  } else {
                        
                        where = rv->region()->position();
                  }

                  boost::shared_ptr<Playlist> to_playlist = rv->region()->playlist();

                  assert (to_playlist);

                  /* add the undo */

                  session->add_command (new MementoCommand<Playlist>(*to_playlist, &to_playlist->get_state(), 0));      

                  if (drag_info.copy) {

                        boost::shared_ptr<Region> newregion;
                        boost::shared_ptr<Region> ar;

                        if ((ar = boost::dynamic_pointer_cast<AudioRegion>(rv->region())) != 0) {
                              newregion = RegionFactory::create (ar);
                        } else {
                              /* XXX MIDI HERE drobilla */
                              continue;
                        }

                        /* add it */

                        latest_regionview = 0;
                        sigc::connection c = atv->view()->RegionViewAdded.connect (mem_fun(*this, &Editor::collect_new_region_view));
                        to_playlist->add_region (newregion, (nframes_t) (where * atv->get_diskstream()->speed()));
                        c.disconnect ();
                        
                        if (latest_regionview) {
                              atv->reveal_dependent_views (*latest_regionview);
                              selection->add (latest_regionview);
                        }
                        
                        /* if the original region was locked, we don't care for the new one */
                        
                        newregion->set_locked (false);                  

                  } else {

                        /* just change the model */

                        rv->region()->set_position (where, (void*) this);

                  }

                  /* add the redo */

                  session->add_command (new MementoCommand<Playlist>(*to_playlist, 0, &to_playlist->get_state()));

                  if (drag_info.copy) {
                        copies.push_back (rv);
                  }
            }
      }

  out:
      
      if (!nocommit) {
            commit_reversible_command ();
      }

      for (vector<RegionView*>::iterator x = copies.begin(); x != copies.end(); ++x) {
            delete *x;
      }
}

void
Editor::region_view_item_click (AudioRegionView& rv, GdkEventButton* event)
{
      /* Either add to or set the set the region selection, unless
         this is an alignment click (control used)
      */
      
      if (Keyboard::modifier_state_contains (event->state, Keyboard::Control)) {
            TimeAxisView* tv = &rv.get_time_axis_view();
            AudioTimeAxisView* atv = dynamic_cast<AudioTimeAxisView*>(tv);
            double speed = 1.0;
            if (atv && atv->is_audio_track()) {
                  speed = atv->get_diskstream()->speed();
            }

            if (Keyboard::modifier_state_equals (event->state, Keyboard::ModifierMask (Keyboard::Control|Keyboard::Alt))) {

                  align_region (rv.region(), SyncPoint, (nframes_t) (edit_cursor->current_frame * speed));

            } else if (Keyboard::modifier_state_equals (event->state, Keyboard::ModifierMask (Keyboard::Control|Keyboard::Shift))) {

                  align_region (rv.region(), End, (nframes_t) (edit_cursor->current_frame * speed));

            } else {

                  align_region (rv.region(), Start, (nframes_t) (edit_cursor->current_frame * speed));
            }
      }
}

void
Editor::show_verbose_time_cursor (nframes_t frame, double offset, double xpos, double ypos) 
{
      char buf[128];
      SMPTE::Time smpte;
      BBT_Time bbt;
      int hours, mins;
      nframes_t frame_rate;
      float secs;

      if (session == 0) {
            return;
      }

      switch (Profile->get_small_screen() ? ARDOUR_UI::instance()->primary_clock.mode () : ARDOUR_UI::instance()->secondary_clock.mode ()) {
      case AudioClock::BBT:
            session->bbt_time (frame, bbt);
            snprintf (buf, sizeof (buf), "%02" PRIu32 "|%02" PRIu32 "|%02" PRIu32, bbt.bars, bbt.beats, bbt.ticks);
            break;
            
      case AudioClock::SMPTE:
            session->smpte_time (frame, smpte);
            snprintf (buf, sizeof (buf), "%02" PRId32 ":%02" PRId32 ":%02" PRId32 ":%02" PRId32, smpte.hours, smpte.minutes, smpte.seconds, smpte.frames);
            break;

      case AudioClock::MinSec:
            /* XXX this is copied from show_verbose_duration_cursor() */
            frame_rate = session->frame_rate();
            hours = frame / (frame_rate * 3600);
            frame = frame % (frame_rate * 3600);
            mins = frame / (frame_rate * 60);
            frame = frame % (frame_rate * 60);
            secs = (float) frame / (float) frame_rate;
            snprintf (buf, sizeof (buf), "%02" PRId32 ":%02" PRId32 ":%.4f", hours, mins, secs);
            break;

      default:
            snprintf (buf, sizeof(buf), "%u", frame);
            break;
      }

      if (xpos >= 0 && ypos >=0) {
            set_verbose_canvas_cursor (buf, xpos + offset, ypos + offset);
      }
      else {
            set_verbose_canvas_cursor (buf, drag_info.current_pointer_x + offset, drag_info.current_pointer_y + offset);
      }
      show_verbose_canvas_cursor ();
}

void
Editor::show_verbose_duration_cursor (nframes_t start, nframes_t end, double offset, double xpos, double ypos) 
{
      char buf[128];
      SMPTE::Time smpte;
      BBT_Time sbbt;
      BBT_Time ebbt;
      int hours, mins;
      nframes_t distance, frame_rate;
      float secs;
      Meter meter_at_start(session->tempo_map().meter_at(start));

      if (session == 0) {
            return;
      }

      switch (ARDOUR_UI::instance()->secondary_clock.mode ()) {
      case AudioClock::BBT:
            session->bbt_time (start, sbbt);
            session->bbt_time (end, ebbt);

            /* subtract */
            /* XXX this computation won't work well if the
            user makes a selection that spans any meter changes.
            */

            ebbt.bars -= sbbt.bars;
            if (ebbt.beats >= sbbt.beats) {
                  ebbt.beats -= sbbt.beats;
            } else {
                  ebbt.bars--;
                  ebbt.beats =  int(meter_at_start.beats_per_bar()) + ebbt.beats - sbbt.beats;
            }
            if (ebbt.ticks >= sbbt.ticks) {
                  ebbt.ticks -= sbbt.ticks;
            } else {
                  ebbt.beats--;
                  ebbt.ticks = int(Meter::ticks_per_beat) + ebbt.ticks - sbbt.ticks;
            }
            
            snprintf (buf, sizeof (buf), "%02" PRIu32 "|%02" PRIu32 "|%02" PRIu32, ebbt.bars, ebbt.beats, ebbt.ticks);
            break;
            
      case AudioClock::SMPTE:
            session->smpte_duration (end - start, smpte);
            snprintf (buf, sizeof (buf), "%02" PRId32 ":%02" PRId32 ":%02" PRId32 ":%02" PRId32, smpte.hours, smpte.minutes, smpte.seconds, smpte.frames);
            break;

      case AudioClock::MinSec:
            /* XXX this stuff should be elsewhere.. */
            distance = end - start;
            frame_rate = session->frame_rate();
            hours = distance / (frame_rate * 3600);
            distance = distance % (frame_rate * 3600);
            mins = distance / (frame_rate * 60);
            distance = distance % (frame_rate * 60);
            secs = (float) distance / (float) frame_rate;
            snprintf (buf, sizeof (buf), "%02" PRId32 ":%02" PRId32 ":%.4f", hours, mins, secs);
            break;

      default:
            snprintf (buf, sizeof(buf), "%u", end - start);
            break;
      }

      if (xpos >= 0 && ypos >=0) {
            set_verbose_canvas_cursor (buf, xpos + offset, ypos + offset);
      }
      else {
            set_verbose_canvas_cursor (buf, drag_info.current_pointer_x + offset, drag_info.current_pointer_y + offset);
      }
      show_verbose_canvas_cursor ();
}

void
Editor::collect_new_region_view (RegionView* rv)
{
      latest_regionview = rv;
}

void
Editor::start_selection_grab (ArdourCanvas::Item* item, GdkEvent* event)
{
      if (clicked_regionview == 0) {
            return;
      }

      /* lets try to create new Region for the selection */

      vector<boost::shared_ptr<AudioRegion> > new_regions;
      create_region_from_selection (new_regions);

      if (new_regions.empty()) {
            return;
      }

      /* XXX fix me one day to use all new regions */
      
      boost::shared_ptr<Region> region (new_regions.front());

      /* add it to the current stream/playlist.

         tricky: the streamview for the track will add a new regionview. we will
         catch the signal it sends when it creates the regionview to
         set the regionview we want to then drag.
      */
      
      latest_regionview = 0;
      sigc::connection c = clicked_audio_trackview->view()->RegionViewAdded.connect (mem_fun(*this, &Editor::collect_new_region_view));
      
      /* A selection grab currently creates two undo/redo operations, one for 
         creating the new region and another for moving it.
      */

      begin_reversible_command (_("selection grab"));

      boost::shared_ptr<Playlist> playlist = clicked_trackview->playlist();

        XMLNode *before = &(playlist->get_state());
      clicked_trackview->playlist()->add_region (region, selection->time[clicked_selection].start);
        XMLNode *after = &(playlist->get_state());
      session->add_command(new MementoCommand<Playlist>(*playlist, before, after));

      commit_reversible_command ();
      
      c.disconnect ();
      
      if (latest_regionview == 0) {
            /* something went wrong */
            return;
      }

      /* we need to deselect all other regionviews, and select this one
         i'm ignoring undo stuff, because the region creation will take care of it */
      selection->set (latest_regionview);
      
      drag_info.item = latest_regionview->get_canvas_group();
      drag_info.data = latest_regionview;
      drag_info.motion_callback = &Editor::region_drag_motion_callback;
      drag_info.finished_callback = &Editor::region_drag_finished_callback;

      start_grab (event);
      
      drag_info.last_trackview = clicked_trackview;
      drag_info.last_frame_position = latest_regionview->region()->position();
      drag_info.pointer_frame_offset = drag_info.grab_frame - drag_info.last_frame_position;
      
      show_verbose_time_cursor (drag_info.last_frame_position, 10);
}

void
Editor::cancel_selection ()
{
        for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
            (*i)->hide_selection ();
      }
      begin_reversible_command (_("cancel selection"));
      selection->clear ();
      clicked_selection = 0;
      commit_reversible_command ();
}     

void
Editor::start_selection_op (ArdourCanvas::Item* item, GdkEvent* event, SelectionOp op)
{
      nframes_t start = 0;
      nframes_t end = 0;

      if (session == 0) {
            return;
      }

      drag_info.item = item;
      drag_info.motion_callback = &Editor::drag_selection;
      drag_info.finished_callback = &Editor::end_selection_op;

      selection_op = op;

      switch (op) {
      case CreateSelection:
            if (Keyboard::modifier_state_equals (event->button.state, Keyboard::Shift)) {
                  drag_info.copy = true;
            } else {
                  drag_info.copy = false;
            }
            start_grab (event, selector_cursor);
            break;

      case SelectionStartTrim:
            if (clicked_trackview) {
                  clicked_trackview->order_selection_trims (item, true);
            } 
            start_grab (event, trimmer_cursor);
            start = selection->time[clicked_selection].start;
            drag_info.pointer_frame_offset = drag_info.grab_frame - start;    
            break;
            
      case SelectionEndTrim:
            if (clicked_trackview) {
                  clicked_trackview->order_selection_trims (item, false);
            }
            start_grab (event, trimmer_cursor);
            end = selection->time[clicked_selection].end;
            drag_info.pointer_frame_offset = drag_info.grab_frame - end;      
            break;

      case SelectionMove:
            start = selection->time[clicked_selection].start;
            start_grab (event);
            drag_info.pointer_frame_offset = drag_info.grab_frame - start;    
            break;
      }

      if (selection_op == SelectionMove) {
            show_verbose_time_cursor(start, 10);      
      } else {
            show_verbose_time_cursor(drag_info.current_pointer_frame, 10);    
      }
}

void
Editor::drag_selection (ArdourCanvas::Item* item, GdkEvent* event)
{
      nframes_t start = 0;
      nframes_t end = 0;
      nframes_t length;
      nframes_t pending_position;

      if (drag_info.current_pointer_frame > drag_info.pointer_frame_offset) {
            pending_position = drag_info.current_pointer_frame - drag_info.pointer_frame_offset;
      } else {
            pending_position = 0;
      }
      
      if (!Keyboard::modifier_state_contains (event->button.state, Keyboard::snap_modifier())) {
            snap_to (pending_position);
      }

      /* only alter selection if the current frame is 
         different from the last frame position (adjusted)
       */
      
      if (pending_position == drag_info.last_pointer_frame) return;
      
      switch (selection_op) {
      case CreateSelection:
            
            if (drag_info.first_move) {
                  snap_to (drag_info.grab_frame);
            }
            
            if (pending_position < drag_info.grab_frame) {
                  start = pending_position;
                  end = drag_info.grab_frame;
            } else {
                  end = pending_position;
                  start = drag_info.grab_frame;
            }
            
            /* first drag: Either add to the selection
               or create a new selection->
            */
            
            if (drag_info.first_move) {
                  
                  begin_reversible_command (_("range selection"));
                  
                  if (drag_info.copy) {
                        /* adding to the selection */
                        clicked_selection = selection->add (start, end);
                        drag_info.copy = false;
                  } else {
                        /* new selection-> */
                        clicked_selection = selection->set (clicked_trackview, start, end);
                  }
            } 
            break;
            
      case SelectionStartTrim:
            
            if (drag_info.first_move) {
                  begin_reversible_command (_("trim selection start"));
            }
            
            start = selection->time[clicked_selection].start;
            end = selection->time[clicked_selection].end;

            if (pending_position > end) {
                  start = end;
            } else {
                  start = pending_position;
            }
            break;
            
      case SelectionEndTrim:
            
            if (drag_info.first_move) {
                  begin_reversible_command (_("trim selection end"));
            }
            
            start = selection->time[clicked_selection].start;
            end = selection->time[clicked_selection].end;

            if (pending_position < start) {
                  end = start;
            } else {
                  end = pending_position;
            }
            
            break;
            
      case SelectionMove:
            
            if (drag_info.first_move) {
                  begin_reversible_command (_("move selection"));
            }
            
            start = selection->time[clicked_selection].start;
            end = selection->time[clicked_selection].end;
            
            length = end - start;
            
            start = pending_position;
            snap_to (start);
            
            end = start + length;
            
            break;
      }
      
      if (event->button.x >= horizontal_adjustment.get_value() + canvas_width) {
            start_canvas_autoscroll (1);
      }

      if (start != end) {
            selection->replace (clicked_selection, start, end);
      }

      drag_info.last_pointer_frame = pending_position;
      drag_info.first_move = false;

      if (selection_op == SelectionMove) {
            show_verbose_time_cursor(start, 10);      
      } else {
            show_verbose_time_cursor(pending_position, 10); 
      }
}

void
Editor::end_selection_op (ArdourCanvas::Item* item, GdkEvent* event)
{
      if (!drag_info.first_move) {
            drag_selection (item, event);
            /* XXX this is not object-oriented programming at all. ick */
            if (selection->time.consolidate()) {
                  selection->TimeChanged ();
            }
            commit_reversible_command ();
      } else {
            /* just a click, no pointer movement.*/

            if (Keyboard::no_modifier_keys_pressed (&event->button)) {

                  selection->clear_time();

            } 
      }

      /* XXX what happens if its a music selection? */
      session->set_audio_range (selection->time);
      stop_canvas_autoscroll ();
}

void
Editor::start_trim (ArdourCanvas::Item* item, GdkEvent* event)
{
      double speed = 1.0;
      TimeAxisView* tvp = clicked_trackview;
      AudioTimeAxisView* tv = dynamic_cast<AudioTimeAxisView*>(tvp);

      if (tv && tv->is_audio_track()) {
            speed = tv->get_diskstream()->speed();
      }
      
      nframes_t region_start = (nframes_t) (clicked_regionview->region()->position() / speed);
      nframes_t region_end = (nframes_t) (clicked_regionview->region()->last_frame() / speed);
      nframes_t region_length = (nframes_t) (clicked_regionview->region()->length() / speed);

      //drag_info.item = clicked_regionview->get_name_highlight();
      drag_info.item = item;
      drag_info.motion_callback = &Editor::trim_motion_callback;
      drag_info.finished_callback = &Editor::trim_finished_callback;

      start_grab (event, trimmer_cursor);
      
      if (Keyboard::modifier_state_equals (event->button.state, Keyboard::Control)) {
            trim_op = ContentsTrim;
      } else {
            /* These will get overridden for a point trim.*/
            if (drag_info.current_pointer_frame < (region_start + region_length/2)) {
                  /* closer to start */
                  trim_op = StartTrim;
            } else if (drag_info.current_pointer_frame > (region_end - region_length/2)) {
                  /* closer to end */
                  trim_op = EndTrim;
            }
      }

      switch (trim_op) {
      case StartTrim:
            show_verbose_time_cursor(region_start, 10);     
            break;
      case EndTrim:
            show_verbose_time_cursor(region_end, 10); 
            break;
      case ContentsTrim:
            show_verbose_time_cursor(drag_info.current_pointer_frame, 10);    
            break;
      }
}

void
Editor::trim_motion_callback (ArdourCanvas::Item* item, GdkEvent* event)
{
      RegionView* rv = clicked_regionview;
      nframes_t frame_delta = 0;
      bool left_direction;
      bool obey_snap = !Keyboard::modifier_state_contains (event->button.state, Keyboard::snap_modifier());

      /* snap modifier works differently here..
         its' current state has to be passed to the 
         various trim functions in order to work properly 
      */ 

      double speed = 1.0;
      TimeAxisView* tvp = clicked_trackview;
      RouteTimeAxisView* tv = dynamic_cast<RouteTimeAxisView*>(tvp);
      pair<set<boost::shared_ptr<Playlist> >::iterator,bool> insert_result;

      if (tv && tv->is_audio_track()) {
            speed = tv->get_diskstream()->speed();
      }
      
      if (drag_info.last_pointer_frame > drag_info.current_pointer_frame) {
            left_direction = true;
      } else {
            left_direction = false;
      }

      if (obey_snap) {
            snap_to (drag_info.current_pointer_frame);
      }

      if (drag_info.current_pointer_frame == drag_info.last_pointer_frame) {
            return;
      }

      if (drag_info.first_move) {
      
            string trim_type;

            switch (trim_op) {
            case StartTrim:
                  trim_type = "Region start trim";
                  break;
            case EndTrim:
                  trim_type = "Region end trim";
                  break;
            case ContentsTrim:
                  trim_type = "Region content trim";
                  break;
            }

            begin_reversible_command (trim_type);

            for (list<RegionView*>::const_iterator i = selection->regions.by_layer().begin(); i != selection->regions.by_layer().end(); ++i) {
                  (*i)->fake_set_opaque(false);             
                  (*i)->region()->freeze ();
            
                  AudioRegionView* const arv = dynamic_cast<AudioRegionView*>(*i);
                  if (arv)
                        arv->temporarily_hide_envelope ();

                  boost::shared_ptr<Playlist> pl = (*i)->region()->playlist();
                  insert_result = motion_frozen_playlists.insert (pl);
                  if (insert_result.second) {
                                session->add_command(new MementoCommand<Playlist>(*pl, &pl->get_state(), 0));
                  }
            }
      }

      if (left_direction) {
            frame_delta = (drag_info.last_pointer_frame - drag_info.current_pointer_frame);
      } else {
            frame_delta = (drag_info.current_pointer_frame - drag_info.last_pointer_frame);
      }

      switch (trim_op) {            
      case StartTrim:
            if ((left_direction == false) && (drag_info.current_pointer_frame <= rv->region()->first_frame()/speed)) {
                  break;
                } else {
                  for (list<RegionView*>::const_iterator i = selection->regions.by_layer().begin(); i != selection->regions.by_layer().end(); ++i) {
                        single_start_trim (**i, frame_delta, left_direction, obey_snap);
                  }
                  break;
            }
            
      case EndTrim:
            if ((left_direction == true) && (drag_info.current_pointer_frame > (nframes_t) (rv->region()->last_frame()/speed))) {
                  break;
            } else {
                  for (list<RegionView*>::const_iterator i = selection->regions.by_layer().begin(); i != selection->regions.by_layer().end(); ++i) {
                        single_end_trim (**i, frame_delta, left_direction, obey_snap);
                  }
                  break;
            }
            
      case ContentsTrim:
            {
                  bool swap_direction = false;

                  if (Keyboard::modifier_state_equals (event->button.state, Keyboard::Control)) {
                        swap_direction = true;
                  }
                  
                  for (list<RegionView*>::const_iterator i = selection->regions.by_layer().begin();
                       i != selection->regions.by_layer().end(); ++i)
                  {
                        single_contents_trim (**i, frame_delta, left_direction, swap_direction, obey_snap);
                  }
            }
            break;
      }

      switch (trim_op) {
      case StartTrim:
            show_verbose_time_cursor((nframes_t) (rv->region()->position()/speed), 10);   
            break;
      case EndTrim:
            show_verbose_time_cursor((nframes_t) (rv->region()->last_frame()/speed), 10); 
            break;
      case ContentsTrim:
            show_verbose_time_cursor(drag_info.current_pointer_frame, 10);    
            break;
      }

      drag_info.last_pointer_frame = drag_info.current_pointer_frame;
      drag_info.first_move = false;
}

void
Editor::single_contents_trim (RegionView& rv, nframes_t frame_delta, bool left_direction, bool swap_direction, bool obey_snap)
{
      boost::shared_ptr<Region> region (rv.region());

      if (region->locked()) {
            return;
      }

      nframes_t new_bound;

      double speed = 1.0;
      TimeAxisView* tvp = clicked_trackview;
      RouteTimeAxisView* tv = dynamic_cast<RouteTimeAxisView*>(tvp);

      if (tv && tv->is_audio_track()) {
            speed = tv->get_diskstream()->speed();
      }
      
      if (left_direction) {
            if (swap_direction) {
                  new_bound = (nframes_t) (region->position()/speed) + frame_delta;
            } else {
                  new_bound = (nframes_t) (region->position()/speed) - frame_delta;
            }
      } else {
            if (swap_direction) {
                  new_bound = (nframes_t) (region->position()/speed) - frame_delta;
            } else {
                  new_bound = (nframes_t) (region->position()/speed) + frame_delta;
            }
      }

      if (obey_snap) {
            snap_to (new_bound);
      }
      region->trim_start ((nframes_t) (new_bound * speed), this); 
      rv.region_changed (StartChanged);
}

void
Editor::single_start_trim (RegionView& rv, nframes_t frame_delta, bool left_direction, bool obey_snap)
{
      boost::shared_ptr<Region> region (rv.region()); 

      if (region->locked()) {
            return;
      }

      nframes_t new_bound;

      double speed = 1.0;
      TimeAxisView* tvp = clicked_trackview;
      AudioTimeAxisView* tv = dynamic_cast<AudioTimeAxisView*>(tvp);

      if (tv && tv->is_audio_track()) {
            speed = tv->get_diskstream()->speed();
      }
      
      if (left_direction) {
            new_bound = (nframes_t) (region->position()/speed) - frame_delta;
      } else {
            new_bound = (nframes_t) (region->position()/speed) + frame_delta;
      }

      if (obey_snap) {
            snap_to (new_bound, (left_direction ? 0 : 1));  
      }

      region->trim_front ((nframes_t) (new_bound * speed), this);

      rv.region_changed (Change (LengthChanged|PositionChanged|StartChanged));
}

void
Editor::single_end_trim (RegionView& rv, nframes_t frame_delta, bool left_direction, bool obey_snap)
{
      boost::shared_ptr<Region> region (rv.region());

      if (region->locked()) {
            return;
      }

      nframes_t new_bound;

      double speed = 1.0;
      TimeAxisView* tvp = clicked_trackview;
      AudioTimeAxisView* tv = dynamic_cast<AudioTimeAxisView*>(tvp);

      if (tv && tv->is_audio_track()) {
            speed = tv->get_diskstream()->speed();
      }
      
      if (left_direction) {
            new_bound = (nframes_t) ((region->last_frame() + 1)/speed) - frame_delta;
      } else {
            new_bound = (nframes_t) ((region->last_frame() + 1)/speed) + frame_delta;
      }

      if (obey_snap) {
            snap_to (new_bound);
      }
      region->trim_end ((nframes_t) (new_bound * speed), this);
      rv.region_changed (LengthChanged);
}
      
void
Editor::trim_finished_callback (ArdourCanvas::Item* item, GdkEvent* event)
{
      if (!drag_info.first_move) {
            trim_motion_callback (item, event);
            
            if (!clicked_regionview->get_selected()) {
                  thaw_region_after_trim (*clicked_regionview);         
            } else {
                  
                  for (list<RegionView*>::const_iterator i = selection->regions.by_layer().begin();
                       i != selection->regions.by_layer().end(); ++i)
                  {
                        thaw_region_after_trim (**i);
                        (*i)->fake_set_opaque (true);
                  }
            }
            
            for (set<boost::shared_ptr<Playlist> >::iterator p = motion_frozen_playlists.begin(); p != motion_frozen_playlists.end(); ++p) {
                  //(*p)->thaw ();
                        session->add_command (new MementoCommand<Playlist>(*(*p).get(), 0, &(*p)->get_state()));
                }
            
            motion_frozen_playlists.clear ();

            commit_reversible_command();
      } else {
            /* no mouse movement */
            point_trim (event);
      }
}

void
Editor::point_trim (GdkEvent* event)
{
      RegionView* rv = clicked_regionview;
      nframes_t new_bound = drag_info.current_pointer_frame;

      if (!Keyboard::modifier_state_contains (event->button.state, Keyboard::snap_modifier())) {
            snap_to (new_bound);
      }

      /* Choose action dependant on which button was pressed */
      switch (event->button.button) {
      case 1:
            trim_op = StartTrim;
            begin_reversible_command (_("Start point trim"));

            if (rv->get_selected()) {

                  for (list<RegionView*>::const_iterator i = selection->regions.by_layer().begin();
                       i != selection->regions.by_layer().end(); ++i)
                  {
                        if (!(*i)->region()->locked()) {
                              boost::shared_ptr<Playlist> pl = (*i)->region()->playlist();
                                        XMLNode &before = pl->get_state();
                              (*i)->region()->trim_front (new_bound, this);   
                                        XMLNode &after = pl->get_state();
                                        session->add_command(new MementoCommand<Playlist>(*pl.get(), &before, &after));
                        }
                  }

            } else {

                  if (!rv->region()->locked()) {
                        boost::shared_ptr<Playlist> pl = rv->region()->playlist();
                        XMLNode &before = pl->get_state();
                        rv->region()->trim_front (new_bound, this);     
                                XMLNode &after = pl->get_state();
                        session->add_command(new MementoCommand<Playlist>(*pl.get(), &before, &after));
                  }
            }

            commit_reversible_command();
      
            break;
      case 2:
            trim_op = EndTrim;
            begin_reversible_command (_("End point trim"));

            if (rv->get_selected()) {
                  
                  for (list<RegionView*>::const_iterator i = selection->regions.by_layer().begin(); i != selection->regions.by_layer().end(); ++i)
                  {
                        if (!(*i)->region()->locked()) {
                              boost::shared_ptr<Playlist> pl = (*i)->region()->playlist();
                              XMLNode &before = pl->get_state();
                              (*i)->region()->trim_end (new_bound, this);
                              XMLNode &after = pl->get_state();
                              session->add_command(new MementoCommand<Playlist>(*pl.get(), &before, &after));
                        }
                  }

            } else {

                  if (!rv->region()->locked()) {
                        boost::shared_ptr<Playlist> pl = rv->region()->playlist();
                        XMLNode &before = pl->get_state();
                        rv->region()->trim_end (new_bound, this);
                                XMLNode &after = pl->get_state();
                        session->add_command (new MementoCommand<Playlist>(*pl.get(), &before, &after));
                  }
            }

            commit_reversible_command();
      
            break;
      default:
            break;
      }
}

void
Editor::thaw_region_after_trim (RegionView& rv)
{
      boost::shared_ptr<Region> region (rv.region());

      if (region->locked()) {
            return;
      }

      region->thaw (_("trimmed region"));
        XMLNode &after = region->playlist()->get_state();
      session->add_command (new MementoCommand<Playlist>(*(region->playlist()), 0, &after));

      AudioRegionView* arv = dynamic_cast<AudioRegionView*>(&rv);
      if (arv)
            arv->unhide_envelope ();
}

void
Editor::hide_marker (ArdourCanvas::Item* item, GdkEvent* event)
{
      Marker* marker;
      bool is_start;

      if ((marker = static_cast<Marker *> (item->get_data ("marker"))) == 0) {
            fatal << _("programming error: marker canvas item has no marker object pointer!") << endmsg;
            /*NOTREACHED*/
      }

      Location* location = find_location_from_marker (marker, is_start);      
      location->set_hidden (true, this);
}


void
Editor::start_range_markerbar_op (ArdourCanvas::Item* item, GdkEvent* event, RangeMarkerOp op)
{
      if (session == 0) {
            return;
      }

      drag_info.item = item;
      drag_info.motion_callback = &Editor::drag_range_markerbar_op;
      drag_info.finished_callback = &Editor::end_range_markerbar_op;

      range_marker_op = op;

      if (!temp_location) {
            temp_location = new Location;
      }
      
      switch (op) {
      case CreateRangeMarker:
      case CreateTransportMarker:
            
            if (Keyboard::modifier_state_equals (event->button.state, Keyboard::Shift)) {
                  drag_info.copy = true;
            } else {
                  drag_info.copy = false;
            }
            start_grab (event, selector_cursor);
            break;
      }

      show_verbose_time_cursor(drag_info.current_pointer_frame, 10);    
      
}

void
Editor::drag_range_markerbar_op (ArdourCanvas::Item* item, GdkEvent* event)
{
      nframes_t start = 0;
      nframes_t end = 0;
      ArdourCanvas::SimpleRect *crect = (range_marker_op == CreateRangeMarker) ? range_bar_drag_rect: transport_bar_drag_rect;
      
      if (!Keyboard::modifier_state_contains (event->button.state, Keyboard::snap_modifier())) {
            snap_to (drag_info.current_pointer_frame);
      }

      /* only alter selection if the current frame is 
         different from the last frame position.
       */
      
      if (drag_info.current_pointer_frame == drag_info.last_pointer_frame) return;
      
      switch (range_marker_op) {
      case CreateRangeMarker:
      case CreateTransportMarker:
            if (drag_info.first_move) {
                  snap_to (drag_info.grab_frame);
            }
            
            if (drag_info.current_pointer_frame < drag_info.grab_frame) {
                  start = drag_info.current_pointer_frame;
                  end = drag_info.grab_frame;
            } else {
                  end = drag_info.current_pointer_frame;
                  start = drag_info.grab_frame;
            }
            
            /* first drag: Either add to the selection
               or create a new selection.
            */
            
            if (drag_info.first_move) {
                  
                  temp_location->set (start, end);
                  
                  crect->show ();

                  update_marker_drag_item (temp_location);
                  range_marker_drag_rect->show();
                  range_marker_drag_rect->raise_to_top();
                  
            } 
            break;            
      }
      
      if (event->button.x >= horizontal_adjustment.get_value() + canvas_width) {
            start_canvas_autoscroll (1);
      }
      
      if (start != end) {
            temp_location->set (start, end);

            double x1 = frame_to_pixel (start);
            double x2 = frame_to_pixel (end);
            crect->property_x1() = x1;
            crect->property_x2() = x2;

            update_marker_drag_item (temp_location);
      }

      drag_info.last_pointer_frame = drag_info.current_pointer_frame;
      drag_info.first_move = false;

      show_verbose_time_cursor(drag_info.current_pointer_frame, 10);    
      
}

void
Editor::end_range_markerbar_op (ArdourCanvas::Item* item, GdkEvent* event)
{
      Location * newloc = 0;
      string rangename;
      
      if (!drag_info.first_move) {
            drag_range_markerbar_op (item, event);

            switch (range_marker_op) {
            case CreateRangeMarker:
                {
                  begin_reversible_command (_("new range marker"));
                        XMLNode &before = session->locations()->get_state();
                  session->locations()->next_available_name(rangename,"unnamed");
                  newloc = new Location(temp_location->start(), temp_location->end(), rangename, Location::IsRangeMarker);
                  session->locations()->add (newloc, true);
                        XMLNode &after = session->locations()->get_state();
                  session->add_command(new MementoCommand<Locations>(*(session->locations()), &before, &after));
                  commit_reversible_command ();
                  
                  range_bar_drag_rect->hide();
                  range_marker_drag_rect->hide();
                  break;
                }

            case CreateTransportMarker:
                  // popup menu to pick loop or punch
                  new_transport_marker_context_menu (&event->button, item);
                  
                  break;
            }
      } else {
            /* just a click, no pointer movement. remember that context menu stuff was handled elsewhere */

            if (Keyboard::no_modifier_keys_pressed (&event->button)) {

                  nframes_t start;
                  nframes_t end;

                  start = session->locations()->first_mark_before (drag_info.grab_frame);
                  end = session->locations()->first_mark_after (drag_info.grab_frame);
                  
                  if (end == max_frames) {
                        end = session->current_end_frame ();
                  }

                  if (start == 0) {
                        start = session->current_start_frame ();
                  }

                  switch (mouse_mode) {
                  case MouseObject:
                        /* find the two markers on either side and then make the selection from it */
                        select_all_within (start, end, 0.0f, FLT_MAX, track_views, Selection::Set);
                        break;

                  case MouseRange:
                        /* find the two markers on either side of the click and make the range out of it */
                        selection->set (0, start, end);
                        break;

                  default:
                        break;
                  }
            } 
      }

      stop_canvas_autoscroll ();
}



void
Editor::start_mouse_zoom (ArdourCanvas::Item* item, GdkEvent* event)
{
      drag_info.item = item;
      drag_info.motion_callback = &Editor::drag_mouse_zoom;
      drag_info.finished_callback = &Editor::end_mouse_zoom;

      start_grab (event, zoom_cursor);

      show_verbose_time_cursor (drag_info.current_pointer_frame, 10);
}

void
Editor::drag_mouse_zoom (ArdourCanvas::Item* item, GdkEvent* event)
{
      nframes_t start;
      nframes_t end;

      if (!Keyboard::modifier_state_contains (event->button.state, Keyboard::snap_modifier())) {
            snap_to (drag_info.current_pointer_frame);
            
            if (drag_info.first_move) {
                  snap_to (drag_info.grab_frame);
            }
      }
            
      if (drag_info.current_pointer_frame == drag_info.last_pointer_frame) return;

      /* base start and end on initial click position */
      if (drag_info.current_pointer_frame < drag_info.grab_frame) {
            start = drag_info.current_pointer_frame;
            end = drag_info.grab_frame;
      } else {
            end = drag_info.current_pointer_frame;
            start = drag_info.grab_frame;
      }
      
      if (start != end) {

            if (drag_info.first_move) {
                  zoom_rect->show();
                  zoom_rect->raise_to_top();
            }

            reposition_zoom_rect(start, end);

            drag_info.last_pointer_frame = drag_info.current_pointer_frame;
            drag_info.first_move = false;

            show_verbose_time_cursor (drag_info.current_pointer_frame, 10);
      }
}

void
Editor::end_mouse_zoom (ArdourCanvas::Item* item, GdkEvent* event)
{
      if (!drag_info.first_move) {
            drag_mouse_zoom (item, event);
            
            if (drag_info.grab_frame < drag_info.last_pointer_frame) {
                  temporal_zoom_by_frame (drag_info.grab_frame, drag_info.last_pointer_frame, "mouse zoom");
            } else {
                  temporal_zoom_by_frame (drag_info.last_pointer_frame, drag_info.grab_frame, "mouse zoom");
            }           
      } else {
            temporal_zoom_to_frame (false, drag_info.grab_frame);
            /*
            temporal_zoom_step (false);
            center_screen (drag_info.grab_frame);
            */
      }

      zoom_rect->hide();
}

void
Editor::reposition_zoom_rect (nframes_t start, nframes_t end)
{
      double x1 = frame_to_pixel (start);
      double x2 = frame_to_pixel (end);
      double y2 = full_canvas_height - 1.0;

      zoom_rect->property_x1() = x1;
      zoom_rect->property_y1() = 1.0;
      zoom_rect->property_x2() = x2;
      zoom_rect->property_y2() = y2;
}

void
Editor::start_rubberband_select (ArdourCanvas::Item* item, GdkEvent* event)
{
      drag_info.item = item;
      drag_info.motion_callback = &Editor::drag_rubberband_select;
      drag_info.finished_callback = &Editor::end_rubberband_select;

      start_grab (event, cross_hair_cursor);

      show_verbose_time_cursor (drag_info.current_pointer_frame, 10);
}

void
Editor::drag_rubberband_select (ArdourCanvas::Item* item, GdkEvent* event)
{
      nframes_t start;
      nframes_t end;
      double y1;
      double y2;

      /* use a bigger drag threshold than the default */

      if (abs ((int) (drag_info.current_pointer_frame - drag_info.grab_frame)) < 8) {
            return;
      }

      if (!Keyboard::modifier_state_contains (event->button.state, Keyboard::snap_modifier())) {
            if (drag_info.first_move) {
                  snap_to (drag_info.grab_frame);
            } 
            snap_to (drag_info.current_pointer_frame);
      }

      /* base start and end on initial click position */

      if (drag_info.current_pointer_frame < drag_info.grab_frame) {
            start = drag_info.current_pointer_frame;
            end = drag_info.grab_frame;
      } else {
            end = drag_info.current_pointer_frame;
            start = drag_info.grab_frame;
      }

      if (drag_info.current_pointer_y < drag_info.grab_y) {
            y1 = drag_info.current_pointer_y;
            y2 = drag_info.grab_y;
      } else {
            y2 = drag_info.current_pointer_y;
            y1 = drag_info.grab_y;
      }

      
      if (start != end || y1 != y2) {

            double x1 = frame_to_pixel (start);
            double x2 = frame_to_pixel (end);
            
            rubberband_rect->property_x1() = x1;
            rubberband_rect->property_y1() = y1;
            rubberband_rect->property_x2() = x2;
            rubberband_rect->property_y2() = y2;

            rubberband_rect->show();
            rubberband_rect->raise_to_top();
            
            drag_info.last_pointer_frame = drag_info.current_pointer_frame;
            drag_info.first_move = false;

            show_verbose_time_cursor (drag_info.current_pointer_frame, 10);
      }
}

void
Editor::end_rubberband_select (ArdourCanvas::Item* item, GdkEvent* event)
{
      if (!drag_info.first_move) {

            drag_rubberband_select (item, event);

            double y1,y2;
            if (drag_info.current_pointer_y < drag_info.grab_y) {
                  y1 = drag_info.current_pointer_y;
                  y2 = drag_info.grab_y;
            }
            else {
                  y2 = drag_info.current_pointer_y;
                  y1 = drag_info.grab_y;
            }


            Selection::Operation op = Keyboard::selection_type (event->button.state);
            bool commit;

            begin_reversible_command (_("rubberband selection"));

            if (drag_info.grab_frame < drag_info.last_pointer_frame) {
                  commit = select_all_within (drag_info.grab_frame, drag_info.last_pointer_frame, y1, y2, track_views, op);
            } else {
                  commit = select_all_within (drag_info.last_pointer_frame, drag_info.grab_frame, y1, y2, track_views, op);
            }           

            if (commit) {
                  commit_reversible_command ();
            }
            
      } else {
            selection->clear_tracks();
            selection->clear_regions();
            selection->clear_points ();
            selection->clear_lines ();
      }

      rubberband_rect->hide();
}


gint
Editor::mouse_rename_region (ArdourCanvas::Item* item, GdkEvent* event)
{
      using namespace Gtkmm2ext;

      ArdourPrompter prompter (false);

      prompter.set_prompt (_("Name for region:"));
      prompter.set_initial_text (clicked_regionview->region()->name());
      prompter.add_button (_("Rename"), Gtk::RESPONSE_ACCEPT);
      prompter.set_response_sensitive (Gtk::RESPONSE_ACCEPT, false);
      prompter.show_all ();
      switch (prompter.run ()) {
      case Gtk::RESPONSE_ACCEPT:
        string str;
            prompter.get_result(str);
            if (str.length()) {
                  clicked_regionview->region()->set_name (str);
            }
            break;
      }
      return true;
}

void
Editor::start_time_fx (ArdourCanvas::Item* item, GdkEvent* event)
{
      drag_info.item = item;
      drag_info.motion_callback = &Editor::time_fx_motion;
      drag_info.finished_callback = &Editor::end_time_fx;

      start_grab (event);

      show_verbose_time_cursor (drag_info.current_pointer_frame, 10);
}

void
Editor::time_fx_motion (ArdourCanvas::Item *item, GdkEvent* event)
{
      RegionView* rv = clicked_regionview;

      if (!Keyboard::modifier_state_contains (event->button.state, Keyboard::snap_modifier())) {
            snap_to (drag_info.current_pointer_frame);
      }

      if (drag_info.current_pointer_frame == drag_info.last_pointer_frame) {
            return;
      }

      if (drag_info.current_pointer_frame > rv->region()->position()) {
            rv->get_time_axis_view().show_timestretch (rv->region()->position(), drag_info.current_pointer_frame);
      }

      drag_info.last_pointer_frame = drag_info.current_pointer_frame;
      drag_info.first_move = false;

      show_verbose_time_cursor (drag_info.current_pointer_frame, 10);
}

void
Editor::end_time_fx (ArdourCanvas::Item* item, GdkEvent* event)
{
      clicked_regionview->get_time_axis_view().hide_timestretch ();

      if (drag_info.first_move) {
            return;
      }
      
      nframes_t newlen = drag_info.last_pointer_frame - clicked_regionview->region()->position();
      float percentage = (float) ((double) newlen - (double) clicked_regionview->region()->length()) / ((double) newlen) * 100.0f;
      
      begin_reversible_command (_("timestretch"));

      if (run_timestretch (selection->regions, percentage) == 0) {
            session->commit_reversible_command ();
      }
}

void
Editor::mouse_brush_insert_region (RegionView* rv, nframes_t pos)
{
      /* no brushing without a useful snap setting */

      // FIXME
      AudioRegionView* arv = dynamic_cast<AudioRegionView*>(rv);
      assert(arv);

      switch (snap_mode) {
      case SnapMagnetic:
            return; /* can't work because it allows region to be placed anywhere */
      default:
            break; /* OK */
      }

      switch (snap_type) {
      case SnapToFrame:
      case SnapToMark:
      case SnapToEditCursor:
            return;

      default:
            break;
      }

      /* don't brush a copy over the original */
      
      if (pos == rv->region()->position()) {
            return;
      }

      RouteTimeAxisView* atv = dynamic_cast<RouteTimeAxisView*>(&arv->get_time_axis_view());

      if (atv == 0 || !atv->is_audio_track()) {
            return;
      }

      boost::shared_ptr<Playlist> playlist = atv->playlist();
      double speed = atv->get_diskstream()->speed();
      
        XMLNode &before = playlist->get_state();
      playlist->add_region (boost::dynamic_pointer_cast<AudioRegion> (RegionFactory::create (arv->audio_region())), (nframes_t) (pos * speed));
        XMLNode &after = playlist->get_state();
      session->add_command(new MementoCommand<Playlist>(*playlist.get(), &before, &after));
      
      // playlist is frozen, so we have to update manually
      
      playlist->Modified(); /* EMIT SIGNAL */
}

gint
Editor::track_height_step_timeout ()
{
      struct timeval now;
      struct timeval delta;
      
      gettimeofday (&now, 0);
      timersub (&now, &last_track_height_step_timestamp, &delta);
      
      if (delta.tv_sec * 1000000 + delta.tv_usec > 250000) { /* milliseconds */
            current_stepping_trackview = 0;
            return false;
      }
      return true;
}

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