Made animation time based not tick based

src/gui/widgets/timeline/timeline-layout-helper.cpp

@@ -271,9 +271,9 @@ TimelineLayoutHelper::lookup_timeline_track(
 void
 TimelineLayoutHelper::begin_animation()
 {
-  animationTimer = Glib::signal_timeout().connect(
+  animationTimer = Glib::signal_idle().connect(
     sigc::mem_fun(this, &TimelineLayoutHelper::on_animation_tick),
-    AnimationTimeout);
+    Glib::PRIORITY_DEFAULT);
 }
 
 bool

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

@@ -37,7 +37,10 @@ namespace widgets {
 namespace timeline {
 
 const int Track::NoAnimationState = -1;
-const int Track::MaxExpandAnimation = 10;
+const int Track::MaxExpandAnimation = 65536;
+const double Track::ExpandAnimationPeriod = 0.15;
+
+Glib::Timer Track::timer;
   
 Track::Track(TimelineWidget &timeline_widget,
   shared_ptr<model::Track> track) :
@@ -50,6 +53,9 @@ Track::Track(TimelineWidget &timeline_widget,
 {
   REQUIRE(model_track);
   
+  // Ensure that the timer is running
+  timer.start();
+  
   titleMenuButton.set_relief(RELIEF_HALF);
   
   buttonBar.append(enableButton);
@@ -126,6 +132,8 @@ Track::expand_collapse(ExpandDirection direction)
       expanded = false;
       expandAnimationState = MaxExpandAnimation;
     }
+    
+  lastTickTime = timer.elapsed();
 }
 
 int
@@ -147,19 +155,23 @@ Track::tick_expand_animation()
     return;    
   }
 
+  const double delta = MaxExpandAnimation * (timer.elapsed() - lastTickTime) / ExpandAnimationPeriod;
+
   if(expandDirection == Expand)
     {
-      expandAnimationState++;
+      expandAnimationState += delta;
       if(expandAnimationState >= MaxExpandAnimation)
         expandAnimationState = NoAnimationState;
     }
   else
     {
-      expandAnimationState--;
+      expandAnimationState -= delta;
       if(expandAnimationState <= 0)
         expandAnimationState = NoAnimationState;
     }
     
+  lastTickTime = timer.elapsed();
+  
   ENSURE((expandAnimationState >= 0 &&
     expandAnimationState <= MaxExpandAnimation) ||
     expandAnimationState == NoAnimationState);

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

@@ -77,6 +77,7 @@ public:
 public:
   static const int NoAnimationState;
   static const int MaxExpandAnimation;
+  static const double ExpandAnimationPeriod;
 
 private:
   //----- Internals -----//
@@ -97,10 +98,11 @@ protected:
 private:
   bool expanded;
   
-
-  
   ExpandDirection expandDirection;
-  int expandAnimationState;
+  double expandAnimationState;
+  
+  static Glib::Timer timer;
+  double lastTickTime;
 
   //----- Header Widgets ------//