public void Next()
{
Children.Remove(fFormerPanel);
fFormerPanel.BeginAnimation(Panel.OpacityProperty, null); // Remove animation (not required but this assists the garbage collector)
fFormerPanel.Done(); // Notify former panel that it is no longer in use.
// Memory leak checking
/*
* GC.Collect();
* GC.WaitForPendingFinalizers();
* GC.Collect(5, GCCollectionMode.Forced);
*/
// Rotate the panels down
fFormerPanel = fActivePanel;
fActivePanel = fNextPanel;
fNextPanel = null;
// Stop the former panel
fFormerPanel.Stop();
// Animate the next panel in and play it
if (fFadeTime >= cMinFadeTime)
{
DoubleAnimation animation = new DoubleAnimation(0.0, 1.0, fFadeTime);
fActivePanel.BeginAnimation(Panel.OpacityProperty, animation, HandoffBehavior.SnapshotAndReplace);
}
else
{
fActivePanel.Opacity = 1.0;
}
fActivePanel.IsMuted = fMuted;
fActivePanel.Play();
if (!fDirectionIsForward)
{
fEnumerator.MoveNext();
fEnumerator.MoveNext();
fDirectionIsForward = true;
}
// Prep the next panel
fEnumerator.MoveNext(AdvanceFlags.Wrap);
string filename = fEnumerator.Current;
if (string.IsNullOrEmpty(filename))
{
fNextPanel = new TextPanel(cNoImagesFound);
}
else
{
fNextPanel = SlidePanel.Load(new Uri(filename));
fNextPanel.ShowMetadata = fShowMetadata;
}
fNextPanel.Opacity = 0.0;
Children.Add(fNextPanel);
}
public void Prev()
{
if (fFormerPanel == null || fFormerPanel is TextPanel)
{
Message("At beginning.");
return;
}
// Make sure we're ready for a reversal
if (fFormerPanel.PanelState == PanelState.Init)
{
Message("Waiting for previous media to load...");
return;
}
// Remove the prepped next panel
Children.Remove(fNextPanel);
fNextPanel.Done(); // Notify next panel that it is no longer in use.
// Reverse-rotate the panels
fNextPanel = fActivePanel;
fActivePanel = fFormerPanel;
fFormerPanel = null;
// Stop the formerly active panel
fNextPanel.Stop();
// Make it transparent again (remove existing animation)
fNextPanel.BeginAnimation(Panel.OpacityProperty, null, HandoffBehavior.SnapshotAndReplace);
fNextPanel.Opacity = 0.0;
Debug.Assert(fActivePanel.Opacity == 1.0); // Ensure that the new active panel is visible
Debug.WriteLine("New Active Panel: " + fActivePanel.Uri);
// Play the new active panel
fActivePanel.IsMuted = fMuted;
fActivePanel.Play();
if (fDirectionIsForward)
{
fEnumerator.MovePrev();
fEnumerator.MovePrev();
fDirectionIsForward = false;
}
// Load up a replacement former panel
if (!fEnumerator.MovePrev() || string.IsNullOrEmpty(fEnumerator.Current))
{
fFormerPanel = new TextPanel("At Beginning");
}
else
{
fFormerPanel = SlidePanel.Load(new Uri(fEnumerator.Current));
fFormerPanel.ShowMetadata = fShowMetadata;
}
Debug.Assert(fFormerPanel.Opacity == 1.0);
Children.Insert(0, fFormerPanel);
}