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);
}
static void TestDirectory(DirectoryInfo dir, FolderTreeEnumerator enumerator)
{
List <FileInfo> files = new List <FileInfo>(dir.GetFiles());
files.Sort(CompareFileInfo);
foreach (FileInfo file in files)
{
if (0 == (file.Attributes & (FileAttributes.Hidden | FileAttributes.System)) && (file.Extension.Equals(".jpg", StringComparison.OrdinalIgnoreCase) || file.Extension.Equals(".doc", StringComparison.OrdinalIgnoreCase)))
{
Trace.WriteLine(enumerator.Current);
if (file.FullName != enumerator.Current)
{
Trace.Fail(string.Format("{0} != {1}", file.FullName, enumerator.Current));
}
enumerator.MoveNext();
enumerator.MovePrev();
if (file.FullName != enumerator.Current)
{
Trace.Fail(string.Format("{0} != {1} (fwd/bck)", file.FullName, enumerator.Current));
}
enumerator.MoveNext();
}
}
foreach (DirectoryInfo subdir in dir.GetDirectories())
{
if (0 == (subdir.Attributes & (FileAttributes.Hidden | FileAttributes.System)))
{
TestDirectory(subdir, enumerator);
}
}
}
