private static void UriSourcePropertyChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
var img = o as LazyImage;
var uri = e.NewValue as Uri;
if (img == null)
{
return;
}
if (uri != null)
{
try
{
if (uri.Scheme == "pack")
{
var bi = new BitmapImage();
bi.BeginInit();
bi.UriSource = uri;
bi.CacheOption = BitmapCacheOption.OnLoad;
bi.EndInit();
bi.Freeze();
SetImage(img, bi, uri);
}
else
{
bool hitCache = false;
try
{
var cache = ImageCacheStorage.GetImageCache(uri);
if (cache != null)
{
SetImage(img, cache, uri);
hitCache = true;
}
else
{
if (img.DefaultImage == null || img.DefaultImage == DependencyProperty.UnsetValue)
{
// img.Source = null causes binding error.
img.SetValue(Image.SourceProperty, DependencyProperty.UnsetValue);
}
else
{
img.Source = img.DefaultImage.CloneFreezeNew();
}
}
}
catch
{
hitCache = false;
}
if (!hitCache)
{
taskrun.Push(() =>
{
try
{
var bi = ImageCacheStorage.DownloadImage(uri);
Application.Current.Dispatcher.BeginInvoke(() => SetImage(img, bi, uri),
DispatcherPriority.ContextIdle);
}
catch { }
});
}
}
}
catch { }
}
}
private void ClearImageCaches()
{
ImageCacheStorage.ClearAllCache();
}