[longomatch] Fix throtlling time updates

[Andoni Morales Alastruey <amorales src gnome org>]

commit 69671929924f011dc6ac0eba2dd50ea085159a84
Author: Andoni Morales Alastruey <ylatuya gmail com>
Date:   Wed May 21 18:18:02 2014 +0200

    Fix throtlling time updates

 LongoMatch.GUI/Gui/Component/Timeline.cs |   33 ++++++++++++++++++++----------
 1 files changed, 22 insertions(+), 11 deletions(-)
---
diff --git a/LongoMatch.GUI/Gui/Component/Timeline.cs b/LongoMatch.GUI/Gui/Component/Timeline.cs
index 69c4262..2faa4c3 100644
--- a/LongoMatch.GUI/Gui/Component/Timeline.cs
+++ b/LongoMatch.GUI/Gui/Component/Timeline.cs
@@ -42,14 +42,15 @@ namespace LongoMatch.Gui.Component
                public event RenderPlaylistHandler RenderPlaylist;
                
                const int TIMERULE_HEIGHT = 30;
+               const uint TIMEOUT_MS = 100;
                
                PlaysTimeline timeline;
                Timerule timerule;
                CategoriesLabels labels;
                MediaFile projectFile;
-               DateTime lastUpdate;
                double secondsPerPixel;
-               Time currentTime;
+               uint timeoutID;
+               Time currentTime, nextCurrentTime;
 
                public Timeline ()
                {
@@ -68,7 +69,7 @@ namespace LongoMatch.Gui.Component
                        hbox1.HeightRequest = TIMERULE_HEIGHT;
                        scrolledwindow1.Vadjustment.ValueChanged += HandleScrollEvent;
                        scrolledwindow1.Hadjustment.ValueChanged += HandleScrollEvent;
-                       lastUpdate = DateTime.Now;
+                       timeoutID = 0;
                }
                
                public TimeNode SelectedTimeNode {
@@ -78,14 +79,7 @@ namespace LongoMatch.Gui.Component
                
                public Time CurrentTime {
                        set {
-                               DateTime now = DateTime.Now;
-                               this.currentTime = value;
-                               if ((now - lastUpdate).TotalMilliseconds > 100) {
-                                       timeline.CurrentTime = value;
-                                       timerule.CurrentTime = value;
-                                       QueueDraw ();
-                                       lastUpdate = now;
-                               }
+                               nextCurrentTime = value;
                        }
                        protected get {
                                return currentTime;
@@ -97,9 +91,16 @@ namespace LongoMatch.Gui.Component
                        labels.LoadProject (project, filter);
                        
                        if(project == null) {
+                               if (timeoutID != 0) {
+                                       GLib.Source.Remove (timeoutID);
+                                       timeoutID = 0;
+                               }
                                return;
                        }
                        
+                       if (timeoutID == 0) {
+                               timeoutID = GLib.Timeout.Add (TIMEOUT_MS, UpdateTime);
+                       }
                        focusscale.Value = 6;
                        projectFile = project.Description.File;
                        timerule.Duration = new Time ((int)project.Description.File.Length);
@@ -120,6 +121,16 @@ namespace LongoMatch.Gui.Component
                        QueueDraw ();
                }
                
+               bool UpdateTime () {
+                       if (nextCurrentTime != currentTime) {
+                               currentTime = nextCurrentTime;
+                               timeline.CurrentTime = currentTime;
+                               timerule.CurrentTime = currentTime;
+                               QueueDraw ();
+                       }
+                       return true;
+               }
+               
                void HandleScrollEvent(object sender, System.EventArgs args)
                {
                        if(sender == scrolledwindow1.Vadjustment)