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time_axis_view_item.cc

/*
    Copyright (C) 2003 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.

    $Id: time_axis_view_item.cc,v 1.31 2005/04/30 18:06:10 pauld Exp $
*/

#include <pbd/error.h>

#include <ardour/types.h>
#include <ardour/ardour.h>

#include "public_editor.h"
#include "time_axis_view_item.h"
#include "time_axis_view.h"
#include "canvas-simplerect.h"
#include "canvas-imageframe.h"
#include "utils.h"
#include "rgb_macros.h"

#include "i18n.h"

using namespace std;
using namespace Editing;

//------------------------------------------------------------------------------
/** Initialize static memeber data */
std::string TimeAxisViewItem::NAME_FONT;
const double TimeAxisViewItem::NAME_X_OFFSET = 15.0;
const double TimeAxisViewItem::NAME_Y_OFFSET = 15.0 ;           /* XXX depends a lot on the font size, sigh. */
const double TimeAxisViewItem::NAME_HIGHLIGHT_SIZE = 15.0 ;     /* ditto */
const double TimeAxisViewItem::NAME_HIGHLIGHT_THRESH = 32.0 ;     /* ditto */
const double TimeAxisViewItem::GRAB_HANDLE_LENGTH = 6 ;


//---------------------------------------------------------------------------------------//
// Constructor / Desctructor

/**
 * Constructs a new TimeAxisViewItem.
 *
 * @param it_name the unique name/Id of this item
 * @param parant the parent canvas group
 * @param tv the TimeAxisView we are going to be added to
 * @param spu samples per unit
 * @param base_color
 * @param start the start point of this item
 * @param duration the duration of this item
 */
00063 TimeAxisViewItem::TimeAxisViewItem(std::string it_name, GtkCanvasGroup* parent, TimeAxisView& tv, double spu, GdkColor& base_color, 
                           jack_nframes_t start, jack_nframes_t duration,
                           Visibility visibility)
      : trackview (tv)
{
      if (NAME_FONT.empty()) {
            NAME_FONT = get_font_for_style (N_("TimeAxisViewItemName"));
      }

      item_name = it_name ;
      samples_per_unit = spu ;
      should_show_selection = true;
      frame_position = start ;
      item_duration = duration ;
      name_connected = false;
      fill_opacity = 50;
      position_locked = false ;
      max_item_duration = ARDOUR::max_frames;
      min_item_duration = 0 ;
      show_vestigial = true;

      if (duration == 0) {
            warning << "Time Axis Item Duration == 0" << endl ;
      }

      group = gtk_canvas_item_new(GTK_CANVAS_GROUP(parent),gtk_canvas_group_get_type(),NULL) ;

      vestigial_frame = gtk_canvas_item_new(GTK_CANVAS_GROUP(group),
                                    gtk_canvas_simplerect_get_type(),
                                    "x1", (double) 0.0,
                                    "y1", (double) 1.0,
                                    "x2", 2.0,
                                    "y2", (double) trackview.height,
                                    "outline_color_rgba", color_map[cVestigialFrameOutline],
                                    "fill_color_rgba", color_map[cVestigialFrameFill],
                                    NULL);
      gtk_canvas_item_hide (vestigial_frame);

      if (visibility & ShowFrame) {
            frame = gtk_canvas_item_new(GTK_CANVAS_GROUP(group),
                                  gtk_canvas_simplerect_get_type(),
                                  "x1", (double) 0.0,
                                  "y1", (double) 1.0,
                                  "x2", (double) trackview.editor.frame_to_pixel(duration),
                                  "y2", (double) trackview.height,
                                  "outline_color_rgba", color_map[cTimeAxisFrameOutline],
                                  "fill_color_rgba", color_map[cTimeAxisFrameFill],
                                  NULL);
      } else {
            frame = 0;
      }

      if (visibility & ShowNameHighlight) {
            name_highlight = gtk_canvas_item_new(GTK_CANVAS_GROUP(group),
                                         gtk_canvas_simplerect_get_type(),
                                         "x1", (double) 1.0,
                                         "x2", (double) (trackview.editor.frame_to_pixel(item_duration)) - 1,
                                         "y1", (double) (trackview.height - TimeAxisViewItem::NAME_HIGHLIGHT_SIZE),
                                         "y2", (double) (trackview.height - 1),
                                         "outline_color_rgba", color_map[cNameHighlightFill],
                                         "fill_color_rgba", color_map[cNameHighlightOutline],
                                         NULL) ;
            gtk_object_set_data(GTK_OBJECT(name_highlight), "timeaxisviewitem", this) ;
      } else {
            name_highlight = 0;
      }

      if (visibility & ShowNameText) {
            name_text = gtk_canvas_item_new(GTK_CANVAS_GROUP(group),
                                    gtk_canvas_text_get_type(),
                                    "x", (double) TimeAxisViewItem::NAME_X_OFFSET,
                                    "y", (double) trackview.height + 1.0 - TimeAxisViewItem::NAME_Y_OFFSET,
                                    "font", NAME_FONT.c_str(),
                                    "anchor", GTK_ANCHOR_NW,
                                    NULL) ;
            gtk_object_set_data(GTK_OBJECT(name_text), "timeaxisviewitem", this) ;
            
      } else {
            name_text = 0;
      }

      /* create our grab handles used for trimming/duration etc */

      if (visibility & ShowHandles) {
            frame_handle_start = gtk_canvas_item_new(GTK_CANVAS_GROUP(group),
                                           gtk_canvas_simplerect_get_type(),
                                           "x1", (double) 0.0,
                                           "x2", (double) TimeAxisViewItem::GRAB_HANDLE_LENGTH,
                                           "y1", (double) 1.0,
                                           "y2", (double) TimeAxisViewItem::GRAB_HANDLE_LENGTH+1,
                                           "outline_color_rgba", color_map[cFrameHandleStartOutline],
                                           "fill_color_rgba", color_map[cFrameHandleStartFill],
                                           NULL) ;
            
            frame_handle_end = gtk_canvas_item_new(GTK_CANVAS_GROUP(group),
                                           gtk_canvas_simplerect_get_type(),
                                           "x1", (double) (trackview.editor.frame_to_pixel(get_duration())) - (TimeAxisViewItem::GRAB_HANDLE_LENGTH),
                                           "x2", (double) trackview.editor.frame_to_pixel(get_duration()),
                                           "y1", (double) 1,
                                           "y2", (double) TimeAxisViewItem::GRAB_HANDLE_LENGTH + 1,
                                           "outline_color_rgba", color_map[cFrameHandleEndOutline],
                                           "fill_color_rgba", color_map[cFrameHandleEndFill],
                                           NULL) ;
      } else {
            frame_handle_start = 0;
            frame_handle_end = 0;
      }

      set_color (base_color) ;

      set_duration (item_duration, this) ;
      set_position (start, this) ;
}


/**
 * Destructor
 */
00181 TimeAxisViewItem::~TimeAxisViewItem()
{
      gtk_object_destroy (GTK_OBJECT(group));
}


//---------------------------------------------------------------------------------------//
// Position and duration Accessors/Mutators

/**
 * Set the position of this item upon the timeline to the specified value
 *
 * @param pos the new position
 * @param src the identity of the object that initiated the change
 * @return true if the position change was a success, false otherwise
 */
bool
00198 TimeAxisViewItem::set_position(jack_nframes_t pos, void* src, double* delta)
{
      if (position_locked) {
            return false;
      }

      frame_position = pos;
      
      /*  This sucks. The GtkCanvas version I am using
          doesn't correctly implement gtk_canvas_group_set_arg(),
          so that simply setting the "x" arg of the group
          fails to move the group. Instead, we have to
          use gtk_canvas_item_move(), which does the right
          thing. I see that in GNOME CVS, the current (Sept 2001)
          version of GNOME Canvas rectifies this issue cleanly.
      */
      
      GtkArg args[1] ;
      double old_unit_pos ;
      double new_unit_pos = pos / samples_per_unit ;

      args[0].name = "x" ;
      gtk_object_getv (GTK_OBJECT(group), 1, args) ;
      old_unit_pos = GTK_VALUE_DOUBLE (args[0]) ;

      if (new_unit_pos != old_unit_pos) {
            gtk_canvas_item_move (group, new_unit_pos - old_unit_pos, 0.0) ;
      }

      if (delta) {
            (*delta) = new_unit_pos - old_unit_pos;
      }
      
       PositionChanged (frame_position, src) ; /* EMIT_SIGNAL */

      return true;
}

/**
 * Return the position of this item upon the timeline
 *
 * @return the position of this item
 */
jack_nframes_t
00242 TimeAxisViewItem::get_position() const
{
      return frame_position;
}

/**
 * Sets the duration of this item
 *
 * @param dur the new duration of this item
 * @param src the identity of the object that initiated the change
 * @return true if the duration change was succesful, false otherwise
 */
bool
00255 TimeAxisViewItem::set_duration (jack_nframes_t dur, void* src)
{
      if ((dur > max_item_duration) || (dur < min_item_duration)) {
            warning << compose (_("new duration %1 frames is out of bounds for %2"), get_item_name(), dur)
                  << endmsg;
            return false;
      }

      if (dur == 0) {
            gtk_canvas_item_hide (group);
      }

      item_duration = dur;
      
      double pixel_width = trackview.editor.frame_to_pixel (dur);

      reset_width_dependent_items (pixel_width);
      
       DurationChanged (dur, src) ; /* EMIT_SIGNAL */
      return true;
}

/**
 * Returns the duration of this item
 *
 */
jack_nframes_t
00282 TimeAxisViewItem::get_duration() const
{
      return (item_duration);
}

/**
 * Sets the maximum duration that this item make have.
 *
 * @param dur the new maximum duration
 * @param src the identity of the object that initiated the change
 */
void
00294 TimeAxisViewItem::set_max_duration(jack_nframes_t dur, void* src)
{
      max_item_duration = dur ;
       MaxDurationChanged(max_item_duration, src) ; /* EMIT_SIGNAL */
}
            
/**
 * Returns the maxmimum duration that this item may be set to
 *
 * @return the maximum duration that this item may be set to
 */
jack_nframes_t
00306 TimeAxisViewItem::get_max_duration() const
{
      return(max_item_duration) ;
}

/**
 * Sets the minimu duration that this item may be set to
 *
 * @param the minimum duration that this item may be set to
 * @param src the identity of the object that initiated the change
 */
void
00318 TimeAxisViewItem::set_min_duration(jack_nframes_t dur, void* src)
{
      min_item_duration = dur ;
       MinDurationChanged(max_item_duration, src) ; /* EMIT_SIGNAL */
}
            
/**
 * Returns the minimum duration that this item mey be set to
 *
 * @return the nimum duration that this item mey be set to
 */
jack_nframes_t
00330 TimeAxisViewItem::get_min_duration() const
{
      return(min_item_duration) ;
}

/**
 * Sets whether the position of this Item is locked to its current position
 * Locked items cannot be moved until the item is unlocked again.
 *
 * @param yn set to true to lock this item to its current position
 * @param src the identity of the object that initiated the change
 */
void
00343 TimeAxisViewItem::set_position_locked(bool yn, void* src)
{
      position_locked = yn ;
      set_trim_handle_colors() ;
      PositionLockChanged (position_locked, src); /* EMIT_SIGNAL */
}

/**
 * Returns whether this item is locked to its current position
 *
 * @return true if this item is locked to its current posotion
 *         false otherwise
 */
bool
00357 TimeAxisViewItem::get_position_locked() const
{
      return (position_locked);
}

/**
 * Sets whether the Maximum Duration constraint is active and should be enforced
 *
 * @param active set true to enforce the max duration constraint
 * @param src the identity of the object that initiated the change
 */
void
00369 TimeAxisViewItem::set_max_duration_active(bool active, void* src)
{
      max_duration_active = active ;
}
            
/**
 * Returns whether the Maximum Duration constraint is active and should be enforced
 *
 * @return true if the maximum duration constraint is active, false otherwise
 */
bool
00380 TimeAxisViewItem::get_max_duration_active() const
{
      return(max_duration_active) ;
}
            
/**
 * Sets whether the Minimum Duration constraint is active and should be enforced
 *
 * @param active set true to enforce the min duration constraint
 * @param src the identity of the object that initiated the change
 */
void
00392 TimeAxisViewItem::set_min_duration_active(bool active, void* src)
{
      min_duration_active = active ;
}
            
/**
 * Returns whether the Maximum Duration constraint is active and should be enforced
 *
 * @return true if the maximum duration constraint is active, false otherwise
 */
bool
00403 TimeAxisViewItem::get_min_duration_active() const
{
      return(min_duration_active) ;
}

//---------------------------------------------------------------------------------------//
// Name/Id Accessors/Mutators

/**
 * Set the name/Id of this item.
 *
 * @param new_name the new name of this item
 * @param src the identity of the object that initiated the change
 */
void
00418 TimeAxisViewItem::set_item_name(std::string new_name, void* src)
{
      if (new_name != item_name) {
            std::string temp_name = item_name ;
            item_name = new_name ;
            NameChanged (item_name, temp_name, src) ; /* EMIT_SIGNAL */
      }
}

/**
 * Returns the name/id of this item
 *
 * @return the name/id of this item
 */
std::string
00433 TimeAxisViewItem::get_item_name() const
{
      return(item_name) ;
}

//---------------------------------------------------------------------------------------//
// Selection Methods

/**
 * Set to true to indicate that this item is currently selected
 *
 * @param yn true if this item is currently selected
 * @param src the identity of the object that initiated the change
 */
void
00448 TimeAxisViewItem::set_selected(bool yn, void* src)
{
      if (_selected != yn) {
            _selected = yn ;
            set_frame_color ();
            Selected (_selected) ; /* EMIT_SIGNAL */
      }
}

/**
 * Returns whether this item is currently selected.
 *
 * @return true if this item is currently selected, false otherwise
 */
bool
00463 TimeAxisViewItem::get_selected() const
{
      return (_selected) ;
}

void 
00469 TimeAxisViewItem::set_should_show_selection (bool yn)
{
      if (should_show_selection != yn) {
            should_show_selection = yn;
            set_frame_color ();
      }
}

//---------------------------------------------------------------------------------------//
// Parent Componenet Methods

/**
 * Returns the TimeAxisView that this item is upon
 *
 * @return the timeAxisView that this item is placed upon
 */
TimeAxisView&
00486 TimeAxisViewItem::get_time_axis_view()
{
      return trackview;
}           
//---------------------------------------------------------------------------------------//
// ui methods & data

/**
 * Sets the displayed item text
 * This item is the visual text name displayed on the canvas item, this can be different to the name of the item
 *
 * @param new_name the new name text to display
 */
void
00500 TimeAxisViewItem::set_name_text(std::string new_name)
{
      if (name_text) {
            gtk_canvas_item_set (name_text, "text", new_name.c_str(), NULL);
      }
}

/**
 * Set the height of this item
 *
 * @param h the new height
 */         
void
00513 TimeAxisViewItem::set_height(double height)
{
      if (name_highlight) {
            if (height < NAME_HIGHLIGHT_THRESH) {
                  gtk_canvas_item_hide (name_highlight);
                  gtk_canvas_item_hide (name_text);
            } else {
                  gtk_canvas_item_show (name_highlight);
                  gtk_canvas_item_show (name_text);
            }

            if (height > NAME_HIGHLIGHT_SIZE) {
                  gtk_canvas_item_set (name_highlight, 
                                   "y1", (double) height+1 - NAME_HIGHLIGHT_SIZE,
                                   "y2", (double) height,
                                   NULL);
            }
            else {
                  /* it gets hidden now anyway */
                  gtk_canvas_item_set (name_highlight, 
                                   "y1", (double) 1.0,
                                   "y2", (double) height,
                                   NULL);
            }
      }

      if (name_text) {
            gtk_canvas_item_set (name_text, "y", height+1 - NAME_Y_OFFSET, NULL);
            if (height < NAME_HIGHLIGHT_THRESH) {
                  gtk_canvas_item_set(name_text, "fill_color_rgba",  fill_color, NULL) ;
            }
            else {
                  gtk_canvas_item_set(name_text, "fill_color_rgba", label_color, NULL) ;
            }
      }

      if (frame) {
            gtk_canvas_item_set (frame, "y2", height+1, NULL) ;
      }

      gtk_canvas_item_set (vestigial_frame, "y2", height+1, NULL) ;
}

/**
 * 
 */
void
TimeAxisViewItem::set_color(GdkColor& base_color)
{
      compute_colors (base_color);
      set_colors ();
}

/**
 * 
 */
GtkCanvasItem*
TimeAxisViewItem::get_canvas_frame()
{
      return(frame) ;
}

/**
 * 
 */
GtkCanvasItem*
TimeAxisViewItem::get_canvas_group()
{
      return(group) ;
}

/**
 * 
 */
GtkCanvasItem*
TimeAxisViewItem::get_name_highlight()
{
      return(name_highlight) ;
}

/**
 * 
 */
GtkCanvasItem*
TimeAxisViewItem::get_name_text()
{
      return(name_text) ;
}

/**
 * Calculates some contrasting color for displaying various parts of this item, based upon the base color
 *
 * @param color the base color of the item
 */
void
00608 TimeAxisViewItem::compute_colors(GdkColor& base_color)
{
      unsigned char radius ;
      char minor_shift ;
      
      unsigned char r,g,b ;

      /* FILL: this is simple */
      r = base_color.red/256 ;
      g = base_color.green/256 ;
      b = base_color.blue/256 ;
      fill_color = RGBA_TO_UINT(r,g,b,255) ;

      /*  for minor colors:
            if the overall saturation is strong, make the minor colors light.
            if its weak, make them dark.
  
            we do this by moving an equal distance to the other side of the
            central circle in the color wheel from where we started.
      */

      radius = (unsigned char) rint (floor (sqrt (static_cast<double>(r*r + g*g + b+b))/3.0f)) ;
      minor_shift = 125 - radius ;

      /* LABEL: rotate around color wheel by 120 degrees anti-clockwise */

      r = base_color.red/256;
      g = base_color.green/256;
      b = base_color.blue/256;
  
      if (r > b)
      {
            if (r > g)
            {
                  /* red sector => green */
                  swap (r,g);
            }
            else
            {
                  /* green sector => blue */
                  swap (g,b);
            } 
      }
      else
      {
            if (b > g)
            {
                  /* blue sector => red */
                  swap (b,r);
            }
            else
            {
                  /* green sector => blue */
                  swap (g,b);
            }
      }

      r += minor_shift;
      b += minor_shift;
      g += minor_shift;
  
      label_color = RGBA_TO_UINT(r,g,b,255);
      r = (base_color.red/256)   + 127 ;
      g = (base_color.green/256) + 127 ;
      b = (base_color.blue/256)  + 127 ;
  
      label_color = RGBA_TO_UINT(r,g,b,255);

      /* XXX can we do better than this ? */
      /* We're trying ;) */
      /* NUKECOLORS */
      
      //frame_color_r = 192;
      //frame_color_g = 192;
      //frame_color_b = 194;
      
      //selected_frame_color_r = 182;
      //selected_frame_color_g = 145;
      //selected_frame_color_b = 168;
      
      //handle_color_r = 25 ;
      //handle_color_g = 0 ;
      //handle_color_b = 255 ;
      //lock_handle_color_r = 235 ;
      //lock_handle_color_g = 16;
      //lock_handle_color_b = 16;
}

/**
 * Convenience method to set the various canvas item colors
 */
void
00700 TimeAxisViewItem::set_colors()
{
      set_frame_color() ;
      if (name_text) {
            double height = NAME_HIGHLIGHT_THRESH;

            if (frame) {
                  GtkArg args[1] ;
                  args[0].name = "y2" ;
                  gtk_object_getv (GTK_OBJECT(frame), 1, args);
                  height = GTK_VALUE_DOUBLE (args[0]);
            }

            if (height < NAME_HIGHLIGHT_THRESH) {
                  gtk_canvas_item_set(name_text, "fill_color_rgba",  fill_color, NULL) ;
            }
            else {
                  gtk_canvas_item_set(name_text, "fill_color_rgba", label_color, NULL) ;
            }
      }

      if (name_highlight) {
            gtk_canvas_item_set(name_highlight, "fill_color_rgba", fill_color, NULL) ;
            gtk_canvas_item_set(name_highlight, "outline_color_rgba", fill_color, NULL) ;
      }
      set_trim_handle_colors() ;
}

/**
 * Sets the frame color depending on whether this item is selected
 */
void
00732 TimeAxisViewItem::set_frame_color()
{
      if (frame) {
            uint32_t r,g,b,a;
            
            if (_selected && should_show_selection) {
                  UINT_TO_RGBA(color_map[cSelectedFrameBase], &r, &g, &b, &a);
                  gtk_canvas_item_set(frame, "fill_color_rgba", RGBA_TO_UINT(r, g, b, fill_opacity), NULL) ;
            } else {
                  UINT_TO_RGBA(color_map[cFrameBase], &r, &g, &b, &a);
                  gtk_canvas_item_set(frame, "fill_color_rgba", RGBA_TO_UINT(r, g, b, fill_opacity), NULL) ;
            }
      }
}

/**
 * Sets the colors of the start and end trim handle depending on object state
 *
 */
void
00752 TimeAxisViewItem::set_trim_handle_colors()
{
      if (frame_handle_start) {
            if (position_locked) {
                  gtk_canvas_item_set(frame_handle_start, "fill_color_rgba", color_map[cTrimHandleLockedStart], NULL);
                  gtk_canvas_item_set(frame_handle_end, "fill_color_rgba", color_map[cTrimHandleLockedEnd], NULL) ;
            } else {
                  gtk_canvas_item_set(frame_handle_start, "fill_color_rgba", color_map[cTrimHandleStart], NULL) ;
                  gtk_canvas_item_set(frame_handle_end, "fill_color_rgba", color_map[cTrimHandleEnd], NULL) ;
            }
      }
}

double
00766 TimeAxisViewItem::get_samples_per_unit()
{
      return(samples_per_unit) ;
}

void
00772 TimeAxisViewItem::set_samples_per_unit (double spu)
{
      samples_per_unit = spu ;
      set_position (this->get_position(), this);
      reset_width_dependent_items ((double)get_duration() / samples_per_unit);
}

void
TimeAxisViewItem::reset_width_dependent_items (double pixel_width)
{
      if (pixel_width < GRAB_HANDLE_LENGTH * 2) {

            if (frame_handle_start) {
                  gtk_canvas_item_hide (frame_handle_start);
                  gtk_canvas_item_hide (frame_handle_end);
            }

      } if (pixel_width < 2.0) {

            if (show_vestigial) {
                  gtk_canvas_item_show (vestigial_frame);
            }

            if (name_highlight) {
                  gtk_canvas_item_hide (name_highlight);
                  gtk_canvas_item_hide (name_text);
            }

            if (frame) {
                  gtk_canvas_item_hide (frame);
            }

            if (frame_handle_start) {
                  gtk_canvas_item_hide (frame_handle_start);
                  gtk_canvas_item_hide (frame_handle_end);
            }
            
      } else {
            gtk_canvas_item_hide (vestigial_frame);

            if (name_highlight) {

                  GtkArg args[1] ;
                  args[0].name = "y2" ;
                  gtk_object_getv (GTK_OBJECT(name_highlight), 1, args);
                  double height = GTK_VALUE_DOUBLE (args[0]);

                  if (height < NAME_HIGHLIGHT_THRESH) {
                        gtk_canvas_item_hide (name_highlight);
                        gtk_canvas_item_hide (name_text);
                  } else {
                        gtk_canvas_item_show (name_highlight);
                        gtk_canvas_item_show (name_text);
                        reset_name_width (pixel_width);
                  }

                  gtk_canvas_item_set (name_highlight, "x2", pixel_width - 1.0, NULL);
            }

            if (frame) {
                  gtk_canvas_item_show (frame);
                  gtk_canvas_item_set (frame, "x2", pixel_width, NULL);
            }

            if (frame_handle_start) {
                  if (pixel_width < (2*TimeAxisViewItem::GRAB_HANDLE_LENGTH)) {
                        gtk_canvas_item_hide (frame_handle_start);
                        gtk_canvas_item_hide (frame_handle_end);
                  }
                  gtk_canvas_item_show (frame_handle_start);
                  gtk_canvas_item_set(GTK_CANVAS_ITEM(frame_handle_end), "x1", pixel_width - (TimeAxisViewItem::GRAB_HANDLE_LENGTH ), NULL) ;
                  gtk_canvas_item_show (frame_handle_end);
                  gtk_canvas_item_set(GTK_CANVAS_ITEM(frame_handle_end), "x2", pixel_width, NULL) ;
            }
      }
}

void
TimeAxisViewItem::reset_name_width (double pixel_width)
{
      gint width;
      gint lbearing;
      gint rbearing;
      gint ascent;
      gint descent;
      Gdk_Font font (NAME_FONT);

      if (name_text == 0) {
            return;
      }

      int namelen = item_name.length();
      char cstr[namelen+1];
      strcpy (cstr, item_name.c_str());
      
      while (namelen) {
            
            gdk_string_extents (font,
                            cstr,
                            &lbearing,
                            &rbearing,
                            &width,
                            &ascent,
                            &descent);

            if (width < (pixel_width - NAME_X_OFFSET)) {
                  break;
            }

            --namelen;
            cstr[namelen] = '\0';

      }

      if (namelen == 0) {
            
            gtk_canvas_item_hide (name_text);
            
      } else {
            
            /* don't use name for event handling if it leaves no room
               for trimming to work.
            */
            
            if (pixel_width - width < (NAME_X_OFFSET * 2.0)) {
                  if (name_connected) {
                        name_connected = false;
                  }
            } else {
                  if (!name_connected) {
                        name_connected = true;
                  }
            }
            
            gtk_canvas_item_set (name_text, "text", cstr, NULL);
            gtk_canvas_item_show (name_text);
      }
}


//---------------------------------------------------------------------------------------//
// Handle time axis removal

/**
 * Handles the Removal of this time axis item
 * This _needs_ to be called to alert others of the removal properly, ie where the source
 * of the removal came from.
 *
 * XXX Although im not too happy about this method of doing things, I cant think of a cleaner method
 *     just now to capture the source of the removal
 *
 * @param src the identity of the object that initiated the change
 */
void
00926 TimeAxisViewItem::remove_this_item(void* src)
{
      /*
         defer to idle loop, otherwise we'll delete this object
         while we're still inside this function ...
      */
      Gtk::Main::idle.connect(bind(slot(&TimeAxisViewItem::idle_remove_this_item), this, src));
}

/**
 * Callback used to remove this time axis item during the gtk idle loop
 * This is used to avoid deleting the obejct while inside the remove_this_item
 * method
 *
 * @param item the ImageFrameTimeAxisGroup to remove
 * @param src the identity of the object that initiated the change
 */
gint
00944 TimeAxisViewItem::idle_remove_this_item(TimeAxisViewItem* item, void* src)
{
       item->ItemRemoved(item->get_item_name(), src) ; /* EMIT_SIGNAL */
      delete item ;
      item = 0 ;
      return(false) ;
}

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