protected override void OnNavigatedFrom(NavigationEventArgs e)
{
if (_loadedImageSurface != null)
{
_loadedImageSurface.Dispose();
_loadedImageSurface = null;
}
}
protected override void OnDisconnected()
{
if (_surface != null)
{
_surface.Dispose();
_surface = null;
}
if (CompositionBrush != null)
{
CompositionBrush.Dispose();
CompositionBrush = null;
}
}
protected override void OnDisconnected()
{
// Dispose Surface and CompositionBrushes if XamlCompBrushBase is removed from tree
if (_surface != null)
{
_surface.Dispose();
_surface = null;
}
if (CompositionBrush != null)
{
CompositionBrush.Dispose();
CompositionBrush = null;
}
}
public void LoadImage(Uri uri, Size?size = null)
{
lock (_lock)
{
if (_surface != null)
{
_surface.LoadCompleted -= _surface_LoadCompleted;
_surface.Dispose();
_surface = null;
}
_loaded = false;
if (size.HasValue)
{
_surface = LoadedImageSurface.StartLoadFromUri(uri, size.Value);
}
else
{
_surface = LoadedImageSurface.StartLoadFromUri(uri);
}
_surface.LoadCompleted += _surface_LoadCompleted;
}
}
/// <summary>
/// Deconstructs the Composition Brush.
/// </summary>
protected override void OnDisconnected()
{
// Dispose of composition resources when no longer in use.
if (CompositionBrush != null)
{
CompositionBrush.Dispose();
CompositionBrush = null;
}
if (_surfaceBrush != null)
{
_surfaceBrush.Dispose();
_surfaceBrush = null;
}
if (_surface != null)
{
_surface.Dispose();
_surface = null;
}
}
/// <summary>
/// Load the image and transform it to a composition brush or a XAML brush (depends of the UIStrategy)
/// </summary>
/// <param name="uri">the uri of the image to load</param>
/// <returns>A <see cref="Task"/> representing the asynchronous operation.</returns>
private async Task <bool> LoadImageBrushAsync(Uri uri)
{
if (DesignTimeHelpers.IsRunningInLegacyDesignerMode)
{
return(false);
}
if (_containerVisual == null || uri == null)
{
return(false);
}
await _flag.WaitAsync();
try
{
bool isAnimated = IsAnimated;
IsAnimated = false;
if (_isImageSourceLoaded)
{
for (int i = 0; i < _compositionChildren.Count; i++)
{
_compositionChildren[i].Brush = null;
}
_brushVisual?.Dispose();
_brushVisual = null;
_imageSurface?.Dispose();
_imageSurface = null;
}
_isImageSourceLoaded = false;
var compositor = _containerVisual.Compositor;
_imageSurface = LoadedImageSurface.StartLoadFromUri(uri);
var loadCompletedSource = new TaskCompletionSource <bool>();
_brushVisual = compositor.CreateSurfaceBrush(_imageSurface);
_imageSurface.LoadCompleted += (s, e) =>
{
if (e.Status == LoadedImageSourceLoadStatus.Success)
{
loadCompletedSource.SetResult(true);
}
else
{
loadCompletedSource.SetException(new ArgumentException("Image loading failed."));
}
};
await loadCompletedSource.Task;
_imageSize = _imageSurface.DecodedPhysicalSize;
_isImageSourceLoaded = true;
RefreshContainerTile();
RefreshImageSize(_imageSize.Width, _imageSize.Height);
if (isAnimated)
{
IsAnimated = true;
}
}
finally
{
_flag.Release();
}
ImageLoaded?.Invoke(this, EventArgs.Empty);
return(true);
}