Initial import of gtk2_ardour.

git-svn-id: svn://localhost/trunk/ardour2@24 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 950 insertions, 0 deletions

diff --git a/gtk2_ardour/time_axis_view_item.cc b/gtk2_ardour/time_axis_view_item.cc
new file mode 100644
index 0000000000..9dffe8fcf6
--- /dev/null
+++ b/gtk2_ardour/time_axis_view_item.cc
@@ -0,0 +1,950 @@
+/*
+    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.
+
+    $Id$
+*/
+
+#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
+ */
+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
+ */
+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
+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
+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
+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
+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
+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
+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
+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
+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
+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
+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
+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
+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
+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
+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
+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
+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
+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
+TimeAxisViewItem::get_selected() const
+{
+	return (_selected) ;
+}
+
+void 
+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&
+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
+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
+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
+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
+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
+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
+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
+TimeAxisViewItem::get_samples_per_unit()
+{
+	return(samples_per_unit) ;
+}
+
+void
+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
+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
+TimeAxisViewItem::idle_remove_this_item(TimeAxisViewItem* item, void* src)
+{
+	 item->ItemRemoved(item->get_item_name(), src) ; /* EMIT_SIGNAL */
+	delete item ;
+	item = 0 ;
+	return(false) ;
+}