Added remove track feature

src/gui/widgets/timeline-widget.cpp

@@ -289,13 +289,20 @@ TimelineWidget::update_tracks()
 { 
   REQUIRE(sequence);
   
+  // Remove any tracks which are no longer present in the model
+  remove_orphaned_tracks();
+  
   // Create timeline tracks from all the model tracks
   create_timeline_tracks();
   
   // Update the header container
   ASSERT(headerContainer != NULL);
+  headerContainer->show_all_children();
   headerContainer->update_headers();
   
+  // Update the body
+  body->queue_draw();
+  
   // Recalculate the total height of the timeline scrolled area
   totalHeight = 0;
   BOOST_FOREACH(shared_ptr<model::Track> track,
@@ -316,9 +323,6 @@ TimelineWidget::create_timeline_tracks()
   BOOST_FOREACH(shared_ptr<model::Track> child,
     sequence->get_child_tracks())
     create_timeline_tracks_from_branch(child);
-    
-  headerContainer->show_all_children();
-  body->queue_draw();
 }
 
 void
@@ -351,14 +355,59 @@ TimelineWidget::create_timeline_track_from_model_track(
   // Choose a corresponding timeline track class from the model track's
   // class
   if(typeid(*model_track) == typeid(model::ClipTrack))
-    return shared_ptr<timeline::Track>(new timeline::ClipTrack());
+    return shared_ptr<timeline::Track>(new timeline::ClipTrack(*this));
   else if(typeid(*model_track) == typeid(model::GroupTrack))
-    return shared_ptr<timeline::Track>(new timeline::GroupTrack());
+    return shared_ptr<timeline::Track>(new timeline::GroupTrack(*this));
   
   ASSERT(NULL); // Unknown track type;
   return shared_ptr<timeline::Track>();
 }
 
+void
+TimelineWidget::remove_orphaned_tracks()
+{
+  REQUIRE(sequence);
+  REQUIRE(headerContainer != NULL);
+  REQUIRE(body != NULL);
+  
+  std::map<boost::shared_ptr<model::Track>,
+    boost::shared_ptr<timeline::Track> >
+    orphan_track_map(trackMap);
+  
+  // Remove all tracks which are still present in the sequence
+  BOOST_FOREACH(shared_ptr<model::Track> child,
+    sequence->get_child_tracks())
+    search_orphaned_tracks_in_branch(child, orphan_track_map);
+  
+  // orphan_track_map now contains all the orphaned tracks
+  // Remove them
+  std::pair<shared_ptr<model::Track>, shared_ptr<timeline::Track> >
+    pair; 
+  BOOST_FOREACH( pair, orphan_track_map )
+    {
+      ENSURE(pair.first)
+      trackMap.erase(pair.first);
+    }
+}
+
+void
+TimelineWidget::search_orphaned_tracks_in_branch(
+    boost::shared_ptr<model::Track> model_track,
+    std::map<boost::shared_ptr<model::Track>,
+    boost::shared_ptr<timeline::Track> > &orphan_track_map)
+{
+  REQUIRE(model_track);
+  
+  // Is the timeline UI still present?
+  if(contains(orphan_track_map, model_track))
+    orphan_track_map.erase(model_track);
+  
+  // Recurse to child tracks
+  BOOST_FOREACH(shared_ptr<model::Track> child,
+    model_track->get_child_tracks())
+    search_orphaned_tracks_in_branch(child, orphan_track_map);
+}
+
 shared_ptr<timeline::Track>
 TimelineWidget::lookup_timeline_track(
   shared_ptr<model::Track> model_track) const
@@ -379,6 +428,31 @@ TimelineWidget::lookup_timeline_track(
   return iterator->second;
 }
 
+boost::shared_ptr<model::Track>
+TimelineWidget::lookup_model_track(
+  const timeline::Track *timeline_track) const
+{
+  REQUIRE(sequence);  
+  
+  std::pair<shared_ptr<model::Track>, shared_ptr<timeline::Track> >
+    pair; 
+  BOOST_FOREACH( pair, trackMap )
+    {
+      if(pair.second.get() == timeline_track)
+        {
+          ENSURE(pair.first);
+          return pair.first;
+        }  
+    }
+    
+  // The track is not present in the map
+  // We are in an error condition if the timeline track is not found
+  // - the timeline tracks must always be synchronous with the model
+  // tracks.
+  ENSURE(0);
+  return shared_ptr<model::Track>();
+}   
+
 void
 TimelineWidget::update_scroll()
 {

src/gui/widgets/timeline-widget.hpp

@@ -191,10 +191,21 @@ private:
    * @return The timeline track created, or an empty shared_ptr if
    * model_track has an unreckognised type (this is an error condition).
    **/
-  static boost::shared_ptr<timeline::Track>
+  boost::shared_ptr<timeline::Track>
     create_timeline_track_from_model_track(
     boost::shared_ptr<model::Track> model_track);
   
+  /**
+   * Removes any UI tracks which no longer have corresponding model
+   * tracks present in the sequence.
+   **/
+  void remove_orphaned_tracks();
+  
+  void search_orphaned_tracks_in_branch(
+    boost::shared_ptr<model::Track> model_track,
+    std::map<boost::shared_ptr<model::Track>,
+    boost::shared_ptr<timeline::Track> > &orphan_track_map);
+  
   /**
    * Looks up a timeline UI track in trackMap that corresponds to a
    * given model_track.
@@ -206,6 +217,17 @@ private:
   boost::shared_ptr<timeline::Track> lookup_timeline_track(
     boost::shared_ptr<model::Track> model_track) const;
     
+  /**
+   * Looks up a model track in trackMap that corresponds to a
+   * given timeline track.
+   * @param timeline_track The timeline UI track to look up.
+   * @returns The model track found, or an empty shared_ptr if
+   * timeline_track has no corresponding timeline UI track (this is an
+   * error condition).
+   **/
+  boost::shared_ptr<model::Track> lookup_model_track(
+    const timeline::Track *timeline_track) const;
+  
   // ----- Layout Functions ----- //
   
   void update_scroll();
@@ -305,6 +327,7 @@ protected:
   friend class timeline::Tool;
   friend class timeline::ArrowTool;
   friend class timeline::IBeamTool;
+  friend class timeline::Track;
 };
 
 }   // namespace widgets

src/gui/widgets/timeline/timeline-clip-track.cpp

@@ -29,7 +29,8 @@ namespace gui {
 namespace widgets {
 namespace timeline {
   
-ClipTrack::ClipTrack()
+ClipTrack::ClipTrack(TimelineWidget &timeline_widget) :
+  Track(timeline_widget)
 {
 }
 

src/gui/widgets/timeline/timeline-clip-track.hpp

@@ -41,7 +41,7 @@ class TimelineViewWindow;
 class ClipTrack : public timeline::Track
 {
 public:
-  ClipTrack();
+  ClipTrack(TimelineWidget &timeline_widget);
   
   void draw_track(Cairo::RefPtr<Cairo::Context> cairo,
     TimelineViewWindow* const window) const;

src/gui/widgets/timeline/timeline-group-track.cpp

@@ -28,7 +28,8 @@ namespace gui {
 namespace widgets {
 namespace timeline {
   
-GroupTrack::GroupTrack()
+GroupTrack::GroupTrack(TimelineWidget &timeline_widget) :
+  Track(timeline_widget)
 {
 }
 

src/gui/widgets/timeline/timeline-group-track.hpp

@@ -36,7 +36,7 @@ namespace timeline {
 class GroupTrack : public timeline::Track
 {
 public:
-  GroupTrack();
+  GroupTrack(TimelineWidget &timeline_widget);
   
   void draw_track(Cairo::RefPtr<Cairo::Context> cairo,
     TimelineViewWindow* constwindow)

src/gui/widgets/timeline/timeline-header-container.cpp

@@ -150,11 +150,25 @@ bool TimelineHeaderContainer::on_button_press_event (
       break;
       
     case 3: // Right Click
-      // Popup the context menu
+      {
-      contextMenu.popup(event->button, event->time);
+        // Popup the context menu
-      break;
+        shared_ptr<Track> header = header_from_point(
-    
+          Gdk::Point(event->x, event->y));
         
+        // Are we hovering on a header?
+        if(header)
+          {
+            // Yes - show the header's context menu
+            header->show_header_context_menu(
+              event->button, event->time);
+          }
+        else
+          {
+            // No - show the default context menu
+            contextMenu.popup(event->button, event->time);
+          }
+        break;
+      }
     }
   
   return true;
@@ -239,6 +253,12 @@ TimelineHeaderContainer::forall_vfunc(gboolean /* include_internals */,
     }
 }
 
+void
+TimelineHeaderContainer::on_remove(Widget* widget)
+{
+  // Do nothing - this is just to keep Gtk::Container happy
+}
+
 bool
 TimelineHeaderContainer::on_expose_event(GdkEventExpose *event)
 { 
@@ -477,6 +497,25 @@ TimelineHeaderContainer::draw_header_decoration(
       draw_header_decoration(child, clip_rect);
 }
 
+boost::shared_ptr<timeline::Track>
+TimelineHeaderContainer::header_from_point(const Gdk::Point &point)
+{
+  std::pair<shared_ptr<timeline::Track>, Gdk::Rectangle> pair; 
+  BOOST_FOREACH( pair, headerBoxes )
+    {
+      // Hit test the rectangle
+      const Gdk::Rectangle &rect = pair.second;
+      
+      if(point.get_x() >= rect.get_x() &&
+        point.get_x() < rect.get_x() + rect.get_width() &&
+        point.get_y() >= rect.get_y() &&
+        point.get_y() < rect.get_y() + rect.get_height())
+        return pair.first;
+    }
+    
+  return shared_ptr<timeline::Track>();
+}
+
 shared_ptr<timeline::Track>
 TimelineHeaderContainer::expander_button_from_point(
   const Gdk::Point &point)

src/gui/widgets/timeline/timeline-header-container.hpp

@@ -119,6 +119,12 @@ private:
   void forall_vfunc(gboolean include_internals, GtkCallback callback,
                     gpointer callback_data);
   
+  /**
+   * An event handler that is called when a widget is removed from the
+   * container.
+   **/             
+  void on_remove(Widget* widget);
+
   /* ===== Events ===== */      
 private:
 
@@ -194,6 +200,9 @@ private:
     boost::shared_ptr<model::Track> model_track,
     const Gdk::Rectangle &clip_rect);
     
+  boost::shared_ptr<timeline::Track> header_from_point(
+    const Gdk::Point &point);
+  
   /**
    * Given a point, expander_button_from_point finds the track of the
    * expand button that this point is hovering over, if there is one.
@@ -297,6 +306,8 @@ private:
    * in pixels.
    **/
   int expand_button_size;
+  
+  friend class timeline::Track;
 };
 
 }   // namespace timeline

src/gui/widgets/timeline/timeline-track.cpp

@@ -24,15 +24,18 @@
 #include <gtk/gtktoolbar.h>
 
 #include "timeline-track.hpp"
+#include "../timeline-widget.hpp"
 #include "../../window-manager.hpp"
 
+using namespace boost;
 using namespace Gtk;
 
 namespace gui {
 namespace widgets {
 namespace timeline {
   
-Track::Track() :
+Track::Track(TimelineWidget &timeline_widget) :
+  timelineWidget(timeline_widget),
   expanded(true),
   enableButton(Gtk::StockID("track_enabled")),
   lockButton(Gtk::StockID("track_unlocked"))
@@ -54,6 +57,14 @@ Track::Track() :
 
   headerWidget.pack_start(titleBox, PACK_SHRINK);
   headerWidget.pack_start(buttonBar, PACK_SHRINK);
+  
+  // Setup the context menu
+  Menu::MenuList& menu_list = contextMenu.items();
+  menu_list.push_back( Menu_Helpers::MenuElem(_("_Add Track"),
+    sigc::mem_fun(timelineWidget,
+    &TimelineWidget::on_add_track_command) ) );
+  menu_list.push_back( Menu_Helpers::MenuElem(_("_Remove Track"),
+    sigc::mem_fun(this, &Track::on_remove_track) ) );
 }
 
 Gtk::Widget&
@@ -80,6 +91,23 @@ Track::set_expanded(bool expanded)
   this->expanded = expanded;
 }
 
+void
+Track::show_header_context_menu(guint button, guint32 time)
+{
+  contextMenu.popup(button, time);
+}
+
+void
+Track::on_remove_track()
+{
+  shared_ptr<model::Track> model_track =
+    timelineWidget.lookup_model_track(this);
+  ASSERT(model_track);
+  ASSERT(timelineWidget.sequence);
+  
+  timelineWidget.sequence->get_child_track_list().remove(model_track);
+}
+
 }   // namespace timeline
 }   // namespace widgets
 }   // namespace gui

src/gui/widgets/timeline/timeline-track.hpp

@@ -25,6 +25,7 @@
 
 #include "../../gtk-lumiera.hpp"
 #include "../../model/track.hpp"
+#include "timeline-header-container.hpp"
 
 #ifndef TIMELINE_TRACK_HPP
 #define TIMELINE_TRACK_HPP
@@ -38,7 +39,7 @@ class TimelineViewWindow;
 class Track
 {
 public:
-  Track();
+  Track(TimelineWidget &timeline_widget);
   
   Gtk::Widget& get_header_widget();
   
@@ -48,11 +49,18 @@ public:
   
   void set_expanded(bool expanded);
   
+  void show_header_context_menu(guint button, guint32 time);
+
   virtual void draw_track(Cairo::RefPtr<Cairo::Context> cairo,
     TimelineViewWindow* const window)
     const = 0;
 
 private:
+  void on_remove_track();
+
+private:
+
+  TimelineWidget &timelineWidget;
 
   bool expanded;
 
@@ -65,6 +73,8 @@ private:
   
   Gtk::Entry titleBox;
   Gtk::Toolbar buttonBar;
+  
+  Gtk::Menu contextMenu;
 };