tdf#100007: slider and time field update during video playback

To make this happen, restart idle in timeout handler (also start it
when user bonks Play button and stop it when they bonk Pause or Stop
button).
The idle also needs a lower prio than TaskPriority::Repaint,
otherwise the higher-prio events from our idle are going to starve UI
repaints in the scheduler queue

Change-Id: I4c767c3533e0e2ee9015c48b17075db5e0dc7ade
Reviewed-on: https://gerrit.libreoffice.org/70068
Tested-by: Jenkins
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>

avmedia/inc/mediacontrol.hxx

@@ -77,6 +77,7 @@ private:
     Size                maMinSize;
     bool                mbLocked;
     MediaControlStyle   meControlStyle;
+    double mfTime;
 };
 
 }

avmedia/source/framework/mediacontrol.cxx

@@ -44,7 +44,8 @@ MediaControl::MediaControl( vcl::Window* pParent, MediaControlStyle eControlStyl
     maIdle( "avmedia MediaControl Idle" ),
     maItem( 0, AVMediaSetMask::ALL ),
     mbLocked( false ),
-    meControlStyle( eControlStyle )
+    meControlStyle( eControlStyle ),
+    mfTime(0.0)
 {
     mpPlayToolBox =  VclPtr<ToolBox>::Create(this, WB_3DLOOK) ;
     mpTimeSlider = VclPtr<Slider>::Create(this, WB_HORZ | WB_DRAG | WB_3DLOOK) ;
@@ -116,10 +117,10 @@ MediaControl::MediaControl( vcl::Window* pParent, MediaControlStyle eControlStyl
         mpZoomToolBox->SetBackground();
         mpZoomToolBox->SetPaintTransparent( true );
     }
-
-    maIdle.SetPriority( TaskPriority::HIGH_IDLE );
+    // we want time field + progress slider to update as the media plays
+    // give this task a lower prio than REPAINT so that UI updates are not starved
+    maIdle.SetPriority( TaskPriority::POST_PAINT );
     maIdle.SetInvokeHandler( LINK( this, MediaControl, implTimeoutHdl ) );
-    maIdle.Start();
 }
 
 void MediaControl::InitializeWidgets()
@@ -245,8 +246,10 @@ void MediaControl::Resize()
 
 void MediaControl::setState( const MediaItem& rItem )
 {
-    if( !mbLocked )
+    double fTime = rItem.getTime();
+    if( !mbLocked && fTime != mfTime)
     {
+        mfTime = fTime;
         maItem.merge( rItem );
         if( rItem.getURL().isEmpty() && meControlStyle == MEDIACONTROLSTYLE_SINGLELINE )
             mpPlayToolBox->Disable();
@@ -310,6 +313,12 @@ IMPL_LINK( MediaControl, implSelectHdl, ToolBox*, p, void )
         else
             SelectPlayToolBoxItem( aExecItem, maItem, p->GetCurItemId() );
 
+        if (aExecItem.getState() == MediaState::Play)
+            maIdle.Start();
+        else if (aExecItem.getState() == MediaState::Pause ||
+                 aExecItem.getState() == MediaState::Stop)
+            maIdle.Stop();
+
         if( aExecItem.getMaskSet() != AVMediaSetMask::NONE )
             execute( aExecItem );
     }
@@ -347,6 +356,7 @@ IMPL_LINK( MediaControl, implZoomSelectHdl, ListBox&, p, void )
 IMPL_LINK_NOARG(MediaControl, implTimeoutHdl, Timer *, void)
 {
     update();
+    maIdle.Start();
 }
 
 } // namespace avmedia