protected override void RenderOverride(DrawingContext context)
{
// TODO support rotation
var currentTransform = context.TotalTransform;
var parentTransform = layer.Parent.TotalTransform;
var parentOffsetX = parentTransform.m31;
var parentOffsetY = parentTransform.m32;
var offsetX = currentTransform.m31 * (parentTransform.m11 / currentTransform.m11);
var offsetY = currentTransform.m32 * (parentTransform.m22 / currentTransform.m22);
offsetX -= parentOffsetX;
offsetY -= parentOffsetY;
control.Arrange(new global::System.Windows.Rect(offsetX, offsetY, Size.Width, Size.Height));
layer.Parent.OnChildRendered(control);
}
protected override void OnRender(WpfDrawingContext drawingContext)
{
var source = PresentationSource.FromVisual(this);
var dpix = (float)source.CompositionTarget.TransformToDevice.M11;
var dpiy = (float)source.CompositionTarget.TransformToDevice.M22;
var skPictureRecorder = new SKPictureRecorder();
// TODO: Can we restrict the culling rect here?
SKRect skCullingRect = SKRect.Create(float.MinValue, float.MinValue, float.MaxValue, float.MaxValue);
SKCanvas canvas = skPictureRecorder.BeginRecording(skCullingRect);
DrawingContext context = new DrawingContext(canvas);
context.Push(Matrix.Scale(dpix, dpiy));
RenderLayer(context);
renderCache = skPictureRecorder.EndRecording();
if (context.IsVisible)
{
if (element != null)
{
element.InvalidateVisual();
}
else
{
element = new();
element.PaintSurface += Element_PaintSurface;
AddVisualChild(element);
element.Measure(size);
element.Arrange(new(size));
}
}
if (renderedChildren.Count > 0)
{
// In some cases children will be removed before measure is called again.
// Don't update child order unless we're up to date.
if (children.Count == renderedChildren.Count)
{
children = renderedChildren;
}
renderedChildren = new List <UIElement>();
}
base.OnRender(drawingContext);
}
protected abstract void RenderLayer(DrawingContext context);
public void OnRender(DrawingContext drawingContext) => throw new NotImplementedException();