private void ThisUnloaded(object sender, RoutedEventArgs e)
{
DisplayInformation.DisplayContentsInvalidated -= DisplayInformation_DisplayContentsInvalidated;
_canvas?.RemoveFromVisualTree();
_canvas = null;
// dispose buffers
_buffer.Dispose();
_tmpBuffer.Dispose();
_background.Dispose();
foreach (var buffer in _undoBuffer)
{
buffer.Value.Dispose();
}
foreach (var buffer in _redoBuffer)
{
buffer.Value.Dispose();
}
foreach (var layer in _layers)
{
layer.Image.Dispose();
}
_undoBuffer.Clear();
_redoBuffer.Clear();
_layers.Clear();
_buffer = null;
_tmpBuffer = null;
_background = null;
}
protected override void OnApplyTemplate()
{
_canvas = (CanvasSwapChainPanel)GetTemplateChild("PART_canvas");
_canvas.Loaded += CanvasCreateResources;
_canvas.SizeChanged += CanvasSizeChanged;
_scrollViewer = (ScrollViewer)GetTemplateChild("PART_ScrollViewer");
_horizontalBar = _scrollViewer.GetVisualChildren <ScrollBar>()
.FirstOrDefault(x => x.Orientation == Orientation.Horizontal);
_verticalBar = _scrollViewer.GetVisualChildren <ScrollBar>()
.FirstOrDefault(x => x.Orientation == Orientation.Vertical);
}
public static CanvasRenderTarget CreateEmpty(CanvasSwapChainPanel device, Size size, float dpi)
{
return(CreateEmpty(device.SwapChain, size, dpi));
}
