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editor_canvas.cc

/*
    Copyright (C) 2005 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.

*/

#ifdef __APPLE__
#define Rect AppleHasItsOwnRect
#include <CoreServices/../Frameworks/CarbonCore.framework/Headers/MacTypes.h>
#undef Rect
#endif /* __APPLE__ */

#include <libgnomecanvasmm/init.h>
#include <libgnomecanvasmm/pixbuf.h>
#include <jack/types.h>
#include <gtkmm2ext/utils.h>

#include <ardour/audioregion.h>
#include <ardour/profile.h>

#include "ardour_ui.h"
#include "editor.h"
#include "waveview.h"
#include "simplerect.h"
#include "simpleline.h"
#include "imageframe.h"
#include "waveview_p.h"
#include "simplerect_p.h"
#include "simpleline_p.h"
#include "imageframe_p.h"
#include "canvas_impl.h"
#include "editing.h"
#include "rgb_macros.h"
#include "utils.h"
#include "time_axis_view.h"
#include "audio_time_axis.h"

#include "i18n.h"

using namespace std;
using namespace sigc;
using namespace ARDOUR;
using namespace PBD;
using namespace Gtk;
using namespace Glib;
using namespace Gtkmm2ext;
using namespace Editing;

/* XXX this is a hack. it ought to be the maximum value of an nframes64_t */

const double max_canvas_coordinate = (double) JACK_MAX_FRAMES;

extern "C"
{

GType gnome_canvas_simpleline_get_type(void);
GType gnome_canvas_simplerect_get_type(void);
GType gnome_canvas_waveview_get_type(void);
GType gnome_canvas_imageframe_get_type(void);

}

static void ardour_canvas_type_init() 
{
      // Map gtypes to gtkmm wrapper-creation functions:
      
      Glib::wrap_register(gnome_canvas_simpleline_get_type(), &Gnome::Canvas::SimpleLine_Class::wrap_new);
      Glib::wrap_register(gnome_canvas_simplerect_get_type(), &Gnome::Canvas::SimpleRect_Class::wrap_new);
      Glib::wrap_register(gnome_canvas_waveview_get_type(), &Gnome::Canvas::WaveView_Class::wrap_new);
      Glib::wrap_register(gnome_canvas_imageframe_get_type(), &Gnome::Canvas::ImageFrame_Class::wrap_new);
      
      // Register the gtkmm gtypes:

      (void) Gnome::Canvas::WaveView::get_type();
      (void) Gnome::Canvas::SimpleLine::get_type();
      (void) Gnome::Canvas::SimpleRect::get_type();
      (void) Gnome::Canvas::ImageFrame::get_type();
} 

void
Editor::initialize_canvas ()
{
      if (getenv ("ARDOUR_NON_AA_CANVAS")) {
            track_canvas = new ArdourCanvas::Canvas ();
      } else {
            track_canvas = new ArdourCanvas::CanvasAA ();
      }
      
      ArdourCanvas::init ();
      ardour_canvas_type_init ();

      /* don't try to center the canvas */

      track_canvas->set_center_scroll_region (false);
      track_canvas->set_dither (Gdk::RGB_DITHER_NONE);

      Glib::RefPtr<Gdk::Screen> screen = get_screen();

      if (!screen) {
            screen = Gdk::Screen::get_default();
      }
      physical_screen_width = screen->get_width ();
      physical_screen_height = screen->get_height ();

      /* stuff for the verbose canvas cursor */

      Pango::FontDescription* font = get_font_for_style (N_("VerboseCanvasCursor"));

      verbose_canvas_cursor = new ArdourCanvas::NoEventText (*track_canvas->root());
      verbose_canvas_cursor->property_font_desc() = *font;
      verbose_canvas_cursor->property_anchor() = ANCHOR_NW;

      delete font;
      
      verbose_cursor_visible = false;

      /* on the bottom, an image */
      
      if (Profile->get_sae()) {
            Image img (::get_icon (X_("saelogo")));
            logo_item = new ArdourCanvas::Pixbuf (*track_canvas->root(), 0.0, 0.0, img.get_pixbuf());
            // logo_item->property_height_in_pixels() = true;
            // logo_item->property_width_in_pixels() = true;
            // logo_item->property_height_set() = true;
            // logo_item->property_width_set() = true;
            logo_item->show ();
      }

      /* a group to hold time (measure) lines */      
      time_line_group = new ArdourCanvas::Group (*track_canvas->root());

#ifdef GTKOSX
      /*XXX please don't laugh. this actually improves canvas performance on osx */
      bogus_background_rect =  new ArdourCanvas::SimpleRect (*time_line_group, 0.0, 0.0, max_canvas_coordinate/3, physical_screen_height);
      bogus_background_rect->property_outline_pixels() = 0;
#endif
      transport_loop_range_rect = new ArdourCanvas::SimpleRect (*time_line_group, 0.0, 0.0, 0.0, physical_screen_height);
      transport_loop_range_rect->property_outline_pixels() = 1;
      transport_loop_range_rect->hide();

      transport_punch_range_rect = new ArdourCanvas::SimpleRect (*time_line_group, 0.0, 0.0, 0.0, physical_screen_height);
      transport_punch_range_rect->property_outline_pixels() = 0;
      transport_punch_range_rect->hide();

      _background_group = new ArdourCanvas::Group (*track_canvas->root());
      _master_group = new ArdourCanvas::Group (*track_canvas->root());

      range_marker_drag_rect = new ArdourCanvas::SimpleRect (*time_line_group, 0.0, 0.0, 0.0, physical_screen_height);
      range_marker_drag_rect->hide ();

      _trackview_group = new ArdourCanvas::Group (*_master_group);
      _region_motion_group = new ArdourCanvas::Group (*_trackview_group);

      meter_bar_group = new ArdourCanvas::Group (*track_canvas->root ());
      if (Profile->get_sae()) {
            meter_bar = new ArdourCanvas::SimpleRect (*meter_bar_group, 0.0, 0.0, physical_screen_width, timebar_height - 1);
            meter_bar->property_outline_pixels() = 1;
      } else {
            meter_bar = new ArdourCanvas::SimpleRect (*meter_bar_group, 0.0, 0.0, physical_screen_width, timebar_height);
            meter_bar->property_outline_pixels() = 0;
      }
      meter_bar->property_outline_what() = (0x1 | 0x8);

      tempo_bar_group = new ArdourCanvas::Group (*track_canvas->root ());
      if (Profile->get_sae()) {
            tempo_bar = new ArdourCanvas::SimpleRect (*tempo_bar_group, 0.0, 0.0, physical_screen_width, (timebar_height - 1));
            tempo_bar->property_outline_pixels() = 1;
      } else {
            tempo_bar = new ArdourCanvas::SimpleRect (*tempo_bar_group, 0.0, 0.0, physical_screen_width, (timebar_height));
            tempo_bar->property_outline_pixels() = 0;
      }
      tempo_bar->property_outline_what() = (0x1 | 0x8);

      range_marker_bar_group = new ArdourCanvas::Group (*track_canvas->root ());
      if (Profile->get_sae()) {
            range_marker_bar = new ArdourCanvas::SimpleRect (*range_marker_bar_group, 0.0, 0.0, physical_screen_width, (timebar_height - 1));
            range_marker_bar->property_outline_pixels() = 1;
      } else {
            range_marker_bar = new ArdourCanvas::SimpleRect (*range_marker_bar_group, 0.0, 0.0, physical_screen_width, (timebar_height));
            range_marker_bar->property_outline_pixels() = 0;
      }
      range_marker_bar->property_outline_what() = (0x1 | 0x8);
      
      transport_marker_bar_group = new ArdourCanvas::Group (*track_canvas->root ());
      if (Profile->get_sae()) {
            transport_marker_bar = new ArdourCanvas::SimpleRect (*transport_marker_bar_group, 0.0, 0.0,  physical_screen_width, (timebar_height - 1));
            transport_marker_bar->property_outline_pixels() = 1;
      } else {
            transport_marker_bar = new ArdourCanvas::SimpleRect (*transport_marker_bar_group, 0.0, 0.0,  physical_screen_width, (timebar_height));
            transport_marker_bar->property_outline_pixels() = 0;
      }
      transport_marker_bar->property_outline_what() = (0x1 | 0x8);

      marker_bar_group = new ArdourCanvas::Group (*track_canvas->root ());
      if (Profile->get_sae()) {
            marker_bar = new ArdourCanvas::SimpleRect (*marker_bar_group, 0.0, 0.0, physical_screen_width, (timebar_height - 1));
            marker_bar->property_outline_pixels() = 1;
      } else {
            marker_bar = new ArdourCanvas::SimpleRect (*marker_bar_group, 0.0, 0.0, physical_screen_width, (timebar_height));
            marker_bar->property_outline_pixels() = 0;
      }
      marker_bar->property_outline_what() = (0x1 | 0x8);
      
      cd_marker_bar_group = new ArdourCanvas::Group (*track_canvas->root ());
      if (Profile->get_sae()) {
            cd_marker_bar = new ArdourCanvas::SimpleRect (*cd_marker_bar_group, 0.0, 0.0, physical_screen_width, (timebar_height - 1));
            cd_marker_bar->property_outline_pixels() = 1;
      } else {
            cd_marker_bar = new ArdourCanvas::SimpleRect (*cd_marker_bar_group, 0.0, 0.0, physical_screen_width, (timebar_height));
            cd_marker_bar->property_outline_pixels() = 0;
      }
      cd_marker_bar->property_outline_what() = (0x1 | 0x8);

      timebar_group =  new ArdourCanvas::Group (*track_canvas->root(), 0.0, 0.0);
      cursor_group = new ArdourCanvas::Group (*track_canvas->root(), 0.0, 0.0);

      meter_group = new ArdourCanvas::Group (*timebar_group, 0.0, timebar_height * 5.0);
      tempo_group = new ArdourCanvas::Group (*timebar_group, 0.0, timebar_height * 4.0);
      range_marker_group = new ArdourCanvas::Group (*timebar_group, 0.0, timebar_height * 3.0);
      transport_marker_group = new ArdourCanvas::Group (*timebar_group, 0.0, timebar_height * 2.0);
      marker_group = new ArdourCanvas::Group (*timebar_group, 0.0, timebar_height);
      cd_marker_group = new ArdourCanvas::Group (*timebar_group, 0.0, 0.0);

      marker_drag_line_points.push_back(Gnome::Art::Point(0.0, 0.0));
      marker_drag_line_points.push_back(Gnome::Art::Point(0.0, physical_screen_height));

      marker_drag_line = new ArdourCanvas::Line (*timebar_group);
      marker_drag_line->property_width_pixels() = 1;
      marker_drag_line->property_points() = marker_drag_line_points;
      marker_drag_line->hide();

      cd_marker_bar_drag_rect = new ArdourCanvas::SimpleRect (*cd_marker_group, 0.0, 0.0, 100, timebar_height);
      cd_marker_bar_drag_rect->property_outline_pixels() = 0;
      cd_marker_bar_drag_rect->hide ();

      range_bar_drag_rect = new ArdourCanvas::SimpleRect (*range_marker_group, 0.0, 0.0, 100, timebar_height);
      range_bar_drag_rect->property_outline_pixels() = 0;
      range_bar_drag_rect->hide ();

      transport_bar_drag_rect = new ArdourCanvas::SimpleRect (*transport_marker_group, 0.0, 0.0, 100, timebar_height);
      transport_bar_drag_rect->property_outline_pixels() = 0;
      transport_bar_drag_rect->hide ();

      transport_punchin_line = new ArdourCanvas::SimpleLine (*_master_group);
      transport_punchin_line->property_x1() = 0.0;
      transport_punchin_line->property_y1() = 0.0;
      transport_punchin_line->property_x2() = 0.0;
      transport_punchin_line->property_y2() = physical_screen_height;
      transport_punchin_line->hide ();
      
      transport_punchout_line  = new ArdourCanvas::SimpleLine (*_master_group);
      transport_punchout_line->property_x1() = 0.0;
      transport_punchout_line->property_y1() = 0.0;
      transport_punchout_line->property_x2() = 0.0;
      transport_punchout_line->property_y2() = physical_screen_height;
      transport_punchout_line->hide();
      
      // used to show zoom mode active zooming
      zoom_rect = new ArdourCanvas::SimpleRect (*_master_group, 0.0, 0.0, 0.0, 0.0);
      zoom_rect->property_outline_pixels() = 1;
      zoom_rect->hide();
      
      zoom_rect->signal_event().connect (bind (mem_fun (*this, &Editor::canvas_zoom_rect_event), (ArdourCanvas::Item*) 0));
      
      // used as rubberband rect
      rubberband_rect = new ArdourCanvas::SimpleRect (*_trackview_group, 0.0, 0.0, 0.0, 0.0);

      rubberband_rect->property_outline_pixels() = 1;
      rubberband_rect->hide();
      
      tempo_bar->signal_event().connect (bind (mem_fun (*this, &Editor::canvas_tempo_bar_event), tempo_bar));
      meter_bar->signal_event().connect (bind (mem_fun (*this, &Editor::canvas_meter_bar_event), meter_bar));
      marker_bar->signal_event().connect (bind (mem_fun (*this, &Editor::canvas_marker_bar_event), marker_bar));
      cd_marker_bar->signal_event().connect (bind (mem_fun (*this, &Editor::canvas_cd_marker_bar_event), cd_marker_bar));
      range_marker_bar->signal_event().connect (bind (mem_fun (*this, &Editor::canvas_range_marker_bar_event), range_marker_bar));
      transport_marker_bar->signal_event().connect (bind (mem_fun (*this, &Editor::canvas_transport_marker_bar_event), transport_marker_bar));

      playhead_cursor = new Cursor (*this, &Editor::canvas_playhead_cursor_event);

      if (logo_item) {
            logo_item->lower_to_bottom ();
      }
      /* need to handle 4 specific types of events as catch-alls */

      track_canvas->signal_scroll_event().connect (mem_fun (*this, &Editor::track_canvas_scroll_event));
      track_canvas->signal_motion_notify_event().connect (mem_fun (*this, &Editor::track_canvas_motion_notify_event));
      track_canvas->signal_button_press_event().connect (mem_fun (*this, &Editor::track_canvas_button_press_event));
      track_canvas->signal_button_release_event().connect (mem_fun (*this, &Editor::track_canvas_button_release_event));

      track_canvas->set_name ("EditorMainCanvas");
      track_canvas->add_events (Gdk::POINTER_MOTION_HINT_MASK|Gdk::SCROLL_MASK);
      track_canvas->signal_leave_notify_event().connect (mem_fun(*this, &Editor::left_track_canvas));
      track_canvas->signal_enter_notify_event().connect (mem_fun(*this, &Editor::entered_track_canvas));
      track_canvas->set_flags (CAN_FOCUS);

      /* set up drag-n-drop */

      vector<TargetEntry> target_table;
      
      // Drag-N-Drop from the region list can generate this target
      target_table.push_back (TargetEntry ("regions"));

      target_table.push_back (TargetEntry ("text/plain"));
      target_table.push_back (TargetEntry ("text/uri-list"));
      target_table.push_back (TargetEntry ("application/x-rootwin-drop"));

      track_canvas->drag_dest_set (target_table);
      track_canvas->signal_drag_data_received().connect (mem_fun(*this, &Editor::track_canvas_drag_data_received));

      track_canvas->signal_size_allocate().connect (mem_fun(*this, &Editor::track_canvas_allocate));

      ColorsChanged.connect (mem_fun (*this, &Editor::color_handler));
      color_handler();

}

void
Editor::track_canvas_allocate (Gtk::Allocation alloc)
{
      canvas_allocation = alloc;
      track_canvas_size_allocated ();
}

bool
Editor::track_canvas_size_allocated ()
{
      bool height_changed = canvas_height != canvas_allocation.get_height();

      canvas_width = canvas_allocation.get_width();
      canvas_height = canvas_allocation.get_height();

      if (session) {
            TrackViewList::iterator i;
            for (i = track_views.begin(); i != track_views.end(); ++i) {
                  (*i)->clip_to_viewport ();
            }
      }

      if (height_changed) {
            if (playhead_cursor) {
                  playhead_cursor->set_length (canvas_height);
            }
      
            for (MarkerSelection::iterator x = selection->markers.begin(); x != selection->markers.end(); ++x) {
                  (*x)->set_line_vpos (0, canvas_height);
            }

            vertical_adjustment.set_page_size (canvas_height);
            last_trackview_group_vertical_offset = get_trackview_group_vertical_offset ();
            if ((vertical_adjustment.get_value() + canvas_height) >= vertical_adjustment.get_upper()) {
                  /* 
                     We're increasing the size of the canvas while the bottom is visible.
                     We scroll down to keep in step with the controls layout.
                  */
                  vertical_adjustment.set_value (full_canvas_height - canvas_height);
            }
      }

      handle_new_duration ();
      reset_hscrollbar_stepping ();
      update_fixed_rulers();
      redisplay_tempo (false);

      Resized (); /* EMIT_SIGNAL */

      return false;
}

void
Editor::controls_layout_size_request (Requisition* req)
{
      TreeModel::Children rows = route_display_model->children();
      TreeModel::Children::iterator i;
      double pos;
      bool changed = false;

      for (pos = 0, i = rows.begin(); i != rows.end(); ++i) {
            TimeAxisView *tv = (*i)[route_display_columns.tv];
            if (tv != 0) {
                  pos += tv->effective_height;
            }
      }

      gint height = min ((gint) pos, (gint) (physical_screen_height - 600));
      gint width = max (edit_controls_vbox.get_width(),  controls_layout.get_width());

      /* don't get too big. the fudge factors here are just guesses */

      width =  min (width, (gint) (physical_screen_width - 300));

      if ((req->width != width) || (req->height != height)) {
            changed = true;
            controls_layout_size_request_connection.disconnect ();
      }

      if (req->width != width) {
            gint vbox_width = edit_controls_vbox.get_width();
            req->width = width;

            /* this one is important: it determines how big the layout thinks it really is, as 
               opposed to what it displays on the screen
            */
            controls_layout.property_width () = vbox_width;
            controls_layout.property_width_request () = vbox_width;

            time_button_event_box.property_width_request () = vbox_width;
            zoom_box.property_width_request () = vbox_width;
      }

      if (req->height != height) {
            req->height = height;
            controls_layout.property_height () = (guint) floor (pos);
            controls_layout.property_height_request () = height;
      }

      if (changed) {
            controls_layout_size_request_connection = controls_layout.signal_size_request().connect (mem_fun (*this, &Editor::controls_layout_size_request));
      }
      //cerr << "sizes = " << req->width << " " << edit_controls_vbox.get_width() << " " << controls_layout.get_width() << " " << zoom_box.get_width() << " " << time_button_frame.get_width() << endl;//DEBUG    
}

bool
Editor::track_canvas_map_handler (GdkEventAny* ev)
{
      track_canvas->get_window()->set_cursor (*current_canvas_cursor);
      return false;
}

void  
Editor::track_canvas_drag_data_received (const RefPtr<Gdk::DragContext>& context,
                               int x, int y, 
                               const SelectionData& data,
                               guint info, guint time)
{
      if (data.get_target() == "regions") {
            drop_regions (context, x, y, data, info, time);
      } else {
            drop_paths (context, x, y, data, info, time);
      }
}

bool
Editor::idle_drop_paths (vector<ustring> paths, nframes64_t frame, double ypos)
{
      drop_paths_part_two (paths, frame, ypos);
      return false;
}

void
Editor::drop_paths_part_two (const vector<ustring>& paths, nframes64_t frame, double ypos)
{
      TimeAxisView* tvp;
      AudioTimeAxisView* tv;

      if ((tvp = trackview_by_y_position (ypos)) == 0) {

            /* drop onto canvas background: create new tracks */

            frame = 0;

            if (Profile->get_sae() || Config->get_only_copy_imported_files()) {
                  do_import (paths, Editing::ImportDistinctFiles, Editing::ImportAsTrack, SrcBest, frame); 
            } else {
                  do_embed (paths, Editing::ImportDistinctFiles, ImportAsTrack, frame);
            }
            
      } else if ((tv = dynamic_cast<AudioTimeAxisView*>(tvp)) != 0) {

            /* check that its an audio track, not a bus */
            
            if (tv->get_diskstream()) {
                  /* select the track, then embed/import */
                  selection->set (tv);

                  if (Profile->get_sae() || Config->get_only_copy_imported_files()) {
                        do_import (paths, Editing::ImportSerializeFiles, Editing::ImportToTrack, SrcBest, frame); 
                  } else {
                        do_embed (paths, Editing::ImportSerializeFiles, ImportToTrack, frame);
                  }
            }
      }
}

void
Editor::drop_paths (const RefPtr<Gdk::DragContext>& context,
                int x, int y, 
                const SelectionData& data,
                guint info, guint time)
{
      vector<ustring> paths;
      GdkEvent ev;
      nframes64_t frame;
      double wx;
      double wy;
      double cy;

      if (convert_drop_to_paths (paths, context, x, y, data, info, time) == 0) {
            
            /* D-n-D coordinates are window-relative, so convert to "world" coordinates
             */

            track_canvas->window_to_world (x, y, wx, wy);
            
            ev.type = GDK_BUTTON_RELEASE;
            ev.button.x = wx;
            ev.button.y = wy;
            
            frame = event_frame (&ev, 0, &cy);
            
            snap_to (frame);
            
#ifdef GTKOSX
            /* We are not allowed to call recursive main event loops from within
               the main event loop with GTK/Quartz. Since import/embed wants
               to push up a progress dialog, defer all this till we go idle.
            */
            Glib::signal_idle().connect (bind (mem_fun (*this, &Editor::idle_drop_paths), paths, frame, cy));
#else
            drop_paths_part_two (paths, frame, cy);
#endif
      }

      context->drag_finish (true, false, time);
}

void
Editor::drop_regions (const RefPtr<Gdk::DragContext>& context,
                  int x, int y, 
                  const SelectionData& data,
                  guint info, guint time)
{
      std::list<boost::shared_ptr<Region> > regions;
      region_list_display.get_object_drag_data (regions);

      for (list<boost::shared_ptr<Region> >::iterator r = regions.begin(); r != regions.end(); ++r) {

            boost::shared_ptr<AudioRegion> ar;

            if ((ar = boost::dynamic_pointer_cast<AudioRegion>(*r)) != 0) {
                  insert_region_list_drag (ar, x, y);
            }
      }

      context->drag_finish (true, false, time);
}

void
Editor::maybe_autoscroll (GdkEventMotion* event)
{

      nframes64_t rightmost_frame = leftmost_frame + current_page_frames();
      nframes64_t frame = drag_info.current_pointer_frame;
      bool startit = false;

      autoscroll_y = 0;
      autoscroll_x = 0;
      if (event->y < canvas_timebars_vsize) {
            autoscroll_y = -1;
            startit = true;
      } else if (event->y > canvas_height) {
            autoscroll_y = 1;
            startit = true;
      }

      if (frame > rightmost_frame) {

            if (rightmost_frame < max_frames) {
                  autoscroll_x = 1;
                  startit = true;
            }

      } else if (frame < leftmost_frame) {
            if (leftmost_frame > 0) {
                  autoscroll_x = -1;
                  startit = true;
            }

      }

      if (!allow_vertical_scroll) {
            autoscroll_y = 0;
      }

      if ((autoscroll_x != last_autoscroll_x) || (autoscroll_y != last_autoscroll_y) || (autoscroll_x == 0 && autoscroll_y == 0)) {
            stop_canvas_autoscroll ();
      }
      
      if (startit && autoscroll_timeout_tag < 0) {
            start_canvas_autoscroll (autoscroll_x, autoscroll_y);
      }

      last_autoscroll_x = autoscroll_x;
      last_autoscroll_y = autoscroll_y;
}

void
Editor::maybe_autoscroll_horizontally (GdkEventMotion* event)
{
      nframes64_t rightmost_frame = leftmost_frame + current_page_frames();
      nframes64_t frame = drag_info.current_pointer_frame;
      bool startit = false;

      autoscroll_y = 0;
      autoscroll_x = 0;

      if (frame > rightmost_frame) {

            if (rightmost_frame < max_frames) {
                  autoscroll_x = 1;
                  startit = true;
            }

      } else if (frame < leftmost_frame) {
            if (leftmost_frame > 0) {
                  autoscroll_x = -1;
                  startit = true;
            }

      }

      if ((autoscroll_x != last_autoscroll_x) || (autoscroll_y != last_autoscroll_y) || (autoscroll_x == 0 && autoscroll_y == 0)) {
            stop_canvas_autoscroll ();
      }
      
      if (startit && autoscroll_timeout_tag < 0) {
            start_canvas_autoscroll (autoscroll_x, autoscroll_y);
      }

      last_autoscroll_x = autoscroll_x;
      last_autoscroll_y = autoscroll_y;
}

gint
Editor::_autoscroll_canvas (void *arg)
{
        return ((Editor *) arg)->autoscroll_canvas ();
}

bool
Editor::autoscroll_canvas ()
{
      nframes64_t new_frame;
      nframes64_t limit = max_frames - current_page_frames();
      GdkEventMotion ev;
      double new_pixel;
      double target_pixel;

      if (autoscroll_x_distance != 0) {
            if (autoscroll_x > 0) {
                  autoscroll_x_distance = (unit_to_frame (drag_info.current_pointer_x) - (leftmost_frame + current_page_frames())) / 3;
            } else if (autoscroll_x < 0) {
                  autoscroll_x_distance = (leftmost_frame - unit_to_frame (drag_info.current_pointer_x)) / 3;

            }
      }

      if (autoscroll_y_distance != 0) {
            if (autoscroll_y > 0) {
                  autoscroll_y_distance = (drag_info.current_pointer_y - (get_trackview_group_vertical_offset() + canvas_height)) / 3;
            } else if (autoscroll_y < 0) {

                  autoscroll_y_distance = (vertical_adjustment.get_value () - drag_info.current_pointer_y) / 3;
            }
      }

      if (autoscroll_x < 0) {
            if (leftmost_frame < autoscroll_x_distance) {
                  new_frame = 0;
            } else {
                  new_frame = leftmost_frame - autoscroll_x_distance;
            }
      } else if (autoscroll_x > 0) {
            if (leftmost_frame > limit - autoscroll_x_distance) {
                  new_frame = limit;
            } else {
                  new_frame = leftmost_frame + autoscroll_x_distance;
            }
      } else {
            new_frame = leftmost_frame;
      }

      double vertical_pos = vertical_adjustment.get_value();

      if (autoscroll_y < 0) {

            if (vertical_pos < autoscroll_y_distance) {
                  new_pixel = 0;
            } else {
                  new_pixel = vertical_pos - autoscroll_y_distance;
            }

            target_pixel = drag_info.current_pointer_y - autoscroll_y_distance;
            target_pixel = max (target_pixel, 0.0);

      } else if (autoscroll_y > 0) {

            double top_of_bottom_of_canvas = full_canvas_height - canvas_height;

            if (vertical_pos > full_canvas_height - autoscroll_y_distance) {
                  new_pixel = full_canvas_height;
            } else {
                  new_pixel = vertical_pos + autoscroll_y_distance;
            }

            new_pixel = min (top_of_bottom_of_canvas, new_pixel);

            target_pixel = drag_info.current_pointer_y + autoscroll_y_distance;
            
            /* don't move to the full canvas height because the item will be invisible
               (its top edge will line up with the bottom of the visible canvas.
            */

            target_pixel = min (target_pixel, full_canvas_height - 10);
            
      } else {
            target_pixel = drag_info.current_pointer_y;
            new_pixel = vertical_pos;
      }

      if ((new_frame == 0 || new_frame == limit) && (new_pixel == 0 || new_pixel == DBL_MAX)) {
            /* we are done */
            return false;
      }

      if (new_frame != leftmost_frame) {
            reset_x_origin (new_frame);
      }

      vertical_adjustment.set_value (new_pixel);

      /* fake an event. */

      Glib::RefPtr<Gdk::Window> canvas_window = const_cast<Editor*>(this)->track_canvas->get_window();
      gint x, y;
      Gdk::ModifierType mask;
      canvas_window->get_pointer (x, y, mask);
      ev.type = GDK_MOTION_NOTIFY;
      ev.state &= Gdk::BUTTON1_MASK;
      ev.x = x;
      ev.y = y;

      motion_handler (drag_info.item, (GdkEvent*) &ev, drag_info.item_type, true);

      autoscroll_cnt++;

      if (autoscroll_cnt == 1) {

            /* connect the timeout so that we get called repeatedly */

            autoscroll_timeout_tag = g_idle_add ( _autoscroll_canvas, this);
            return false;

      } 

      return true;
}

void
Editor::start_canvas_autoscroll (int dx, int dy)
{
      if (!session || autoscroll_active) {
            return;
      }

      stop_canvas_autoscroll ();

      autoscroll_active = true;
      autoscroll_x = dx;
      autoscroll_y = dy;
      autoscroll_x_distance = (nframes64_t) floor (current_page_frames()/50.0);
      autoscroll_y_distance = fabs (dy * 5); /* pixels */
      autoscroll_cnt = 0;
      
      /* do it right now, which will start the repeated callbacks */

      autoscroll_canvas ();
}

void
Editor::stop_canvas_autoscroll ()
{

      if (autoscroll_timeout_tag >= 0) {
            g_source_remove (autoscroll_timeout_tag);
            autoscroll_timeout_tag = -1;
      }

      autoscroll_active = false;
}

bool
Editor::left_track_canvas (GdkEventCrossing *ev)
{
      set_entered_track (0);
      set_entered_regionview (0);
      reset_canvas_action_sensitivity (false);
      return false;
}

bool
Editor::entered_track_canvas (GdkEventCrossing *ev)
{
      reset_canvas_action_sensitivity (true);
      return FALSE;
}

void
Editor::tie_vertical_scrolling ()
{
      scroll_canvas_vertically ();

      /* this will do an immediate redraw */

      controls_layout.get_vadjustment()->set_value (vertical_adjustment.get_value());
}

void
Editor::scroll_canvas_horizontally ()
{
      /* horizontal scrolling only */
      double x1, y1, x2, y2, x_delta;
      _master_group->get_bounds (x1, y1, x2, y2);

      x_delta = - (x1 +  horizontal_adjustment.get_value());

      _master_group->move (x_delta, 0);
      timebar_group->move (x_delta, 0);
      time_line_group->move (x_delta, 0);
      cursor_group->move (x_delta, 0);

      leftmost_frame = (nframes64_t) floor (horizontal_adjustment.get_value() * frames_per_unit);

      update_fixed_rulers ();
      redisplay_tempo (true);

#ifndef GTKOSX
      if (!autoscroll_active && !_stationary_playhead) {
            /* force rulers and canvas to move in lock step */
            while (gtk_events_pending ()) {
                  gtk_main_iteration ();
            }
      }
#endif

}

void
Editor::scroll_canvas_vertically ()
{
      /* vertical scrolling only */

      double y_delta;

      y_delta = last_trackview_group_vertical_offset - get_trackview_group_vertical_offset ();
      _trackview_group->move (0, y_delta);
      _background_group->move (0, y_delta);

      for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
            (*i)->clip_to_viewport ();
      }
      last_trackview_group_vertical_offset = get_trackview_group_vertical_offset ();
      /* required to keep the controls_layout in lock step with the canvas group */
      track_canvas->update_now ();
}

void
Editor::color_handler()
{
      playhead_cursor->canvas_item.property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_PlayHead.get();
      verbose_canvas_cursor->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_VerboseCanvasCursor.get();

      meter_bar->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_MeterBar.get();
      meter_bar->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBarSeparator.get();

      tempo_bar->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_TempoBar.get();
      tempo_bar->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBarSeparator.get();

      marker_bar->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBar.get();
      marker_bar->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBarSeparator.get();

      cd_marker_bar->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_CDMarkerBar.get();
      cd_marker_bar->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBarSeparator.get();

      range_marker_bar->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_RangeMarkerBar.get();
      range_marker_bar->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBarSeparator.get();

      transport_marker_bar->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_TransportMarkerBar.get();
      transport_marker_bar->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerBarSeparator.get();

      cd_marker_bar_drag_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_RangeDragBarRect.get();
      cd_marker_bar_drag_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_RangeDragBarRect.get();

      range_bar_drag_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_RangeDragBarRect.get();
      range_bar_drag_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_RangeDragBarRect.get();

      transport_bar_drag_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_TransportDragRect.get();
      transport_bar_drag_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_TransportDragRect.get();

      marker_drag_line->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_MarkerDragLine.get();

      range_marker_drag_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_RangeDragRect.get();
      range_marker_drag_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_RangeDragRect.get();

      transport_loop_range_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_TransportLoopRect.get();
      transport_loop_range_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_TransportLoopRect.get();

      transport_punch_range_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_TransportPunchRect.get();
      transport_punch_range_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_TransportPunchRect.get();

      transport_punchin_line->property_color_rgba() = ARDOUR_UI::config()->canvasvar_PunchLine.get();
      transport_punchout_line->property_color_rgba() = ARDOUR_UI::config()->canvasvar_PunchLine.get();

      zoom_rect->property_fill_color_rgba() = ARDOUR_UI::config()->canvasvar_ZoomRect.get();
      zoom_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_ZoomRect.get();

      rubberband_rect->property_outline_color_rgba() = ARDOUR_UI::config()->canvasvar_RubberBandRect.get();
      rubberband_rect->property_fill_color_rgba() = (guint32) ARDOUR_UI::config()->canvasvar_RubberBandRect.get();

      location_marker_color = ARDOUR_UI::config()->canvasvar_LocationMarker.get();
      location_range_color = ARDOUR_UI::config()->canvasvar_LocationRange.get();
      location_cd_marker_color = ARDOUR_UI::config()->canvasvar_LocationCDMarker.get();
      location_loop_color = ARDOUR_UI::config()->canvasvar_LocationLoop.get();
      location_punch_color = ARDOUR_UI::config()->canvasvar_LocationPunch.get();

      refresh_location_display ();
/*
      redisplay_tempo (true);

      if (session)
            session->tempo_map().apply_with_metrics (*this, &Editor::draw_metric_marks); // redraw metric markers
*/
}

void
Editor::flush_canvas ()
{
      if (is_mapped()) {
            track_canvas->update_now ();
            // gdk_window_process_updates (GTK_LAYOUT(track_canvas->gobj())->bin_window, true);
      }
}


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