public static Visual Attach(UIElement element, float radius, float opacity, CompositionClip clip = null)
{
var elementVisual = ElementCompositionPreview.GetElementVisual(element);
var shadow = elementVisual.Compositor.CreateDropShadow();
shadow.BlurRadius = radius;
shadow.Opacity = opacity;
shadow.Color = Colors.Black;
var visual = elementVisual.Compositor.CreateSpriteVisual();
visual.Shadow = shadow;
visual.Size = new Vector2(0, 0);
visual.Offset = new Vector3(0, 0, 0);
visual.Clip = clip;
switch (element)
{
case Image image:
shadow.Mask = image.GetAlphaMask();
break;
case Shape shape:
shadow.Mask = shape.GetAlphaMask();
break;
case TextBlock textBlock:
shadow.Mask = textBlock.GetAlphaMask();
break;
}
ElementCompositionPreview.SetElementChildVisual(element, visual);
return(visual);
}
IEnumerable <XObject> GetCompositionClipContents(CompositionClip obj)
{
foreach (var item in GetCompositionObjectContents(obj))
{
yield return(item);
}
yield return(FromVector2DefaultZero(nameof(obj.CenterPoint), obj.CenterPoint));
yield return(FromVector2DefaultOne(nameof(obj.Scale), obj.Scale));
}
CompositionClip GetCompositionClip(CompositionClip obj)
{
switch (obj.Type)
{
case CompositionObjectType.InsetClip:
return(GetInsetClip((InsetClip)obj));
case CompositionObjectType.CompositionGeometricClip:
return(GetCompositionGeometricClip((CompositionGeometricClip)obj));
default:
throw new InvalidOperationException();
}
}
public static void ClipVisual(this FrameworkElement frameworkElement, Geometry geometry)
{
// UIElement.Clip only support rectangle geometry to be used for clipping area sizing.
// If the used Build is 17763 or higher, we use Composition's APIs (CompositionGeometricClip) to allow Clip complex geometries.
#if UWP_18362
var compositor = Window.Current.Compositor;
var visual = ElementCompositionPreview.GetElementVisual(frameworkElement);
CompositionClip compositionClip = null;
if (geometry is EllipseGeometry ellipseGeometry)
{
var compositionEllipseGeometry = compositor.CreateEllipseGeometry();
compositionEllipseGeometry.Center = new WVector2((float)ellipseGeometry.Center.X, (float)ellipseGeometry.Center.Y);
compositionEllipseGeometry.Radius = new WVector2((float)ellipseGeometry.RadiusX, (float)ellipseGeometry.RadiusY);
compositionClip = compositor.CreateGeometricClip(compositionEllipseGeometry);
}
else if (geometry is LineGeometry lineGeometry)
{
var compositionLineGeometry = compositor.CreateLineGeometry();
compositionLineGeometry.Start = new WVector2((float)lineGeometry.StartPoint.X, (float)lineGeometry.StartPoint.Y);
compositionLineGeometry.End = new WVector2((float)lineGeometry.EndPoint.X, (float)lineGeometry.EndPoint.Y);
compositionClip = compositor.CreateGeometricClip(compositionLineGeometry);
}
else if (geometry is RectangleGeometry rectangleGeometry)
{
var compositionRectangleGeometry = compositor.CreateRectangleGeometry();
compositionRectangleGeometry.Offset = new WVector2((float)rectangleGeometry.Rect.X, (float)rectangleGeometry.Rect.Y);
compositionRectangleGeometry.Size = new WVector2((float)rectangleGeometry.Rect.Width, (float)rectangleGeometry.Rect.Height);
compositionClip = compositor.CreateGeometricClip(compositionRectangleGeometry);
}
if (visual.Clip != compositionClip)
{
visual.Clip = compositionClip;
}
#endif
}
public static void ClipVisual(this FrameworkElement frameworkElement, Geometry geometry)
{
var compositor = ElementCompositionPreview.GetElementVisual(frameworkElement).Compositor;
var visual = ElementCompositionPreview.GetElementVisual(frameworkElement);
CompositionClip compositionClip = null;
if (geometry is EllipseGeometry ellipseGeometry)
{
var compositionEllipseGeometry = compositor.CreateEllipseGeometry();
compositionEllipseGeometry.Center = new WVector2((float)ellipseGeometry.Center.X, (float)ellipseGeometry.Center.Y);
compositionEllipseGeometry.Radius = new WVector2((float)ellipseGeometry.RadiusX, (float)ellipseGeometry.RadiusY);
compositionClip = compositor.CreateGeometricClip(compositionEllipseGeometry);
}
else if (geometry is LineGeometry lineGeometry)
{
var compositionLineGeometry = compositor.CreateLineGeometry();
compositionLineGeometry.Start = new WVector2((float)lineGeometry.StartPoint.X, (float)lineGeometry.StartPoint.Y);
compositionLineGeometry.End = new WVector2((float)lineGeometry.EndPoint.X, (float)lineGeometry.EndPoint.Y);
compositionClip = compositor.CreateGeometricClip(compositionLineGeometry);
}
else if (geometry is RectangleGeometry rectangleGeometry)
{
var compositionRectangleGeometry = compositor.CreateRectangleGeometry();
compositionRectangleGeometry.Offset = new WVector2((float)rectangleGeometry.Rect.X, (float)rectangleGeometry.Rect.Y);
compositionRectangleGeometry.Size = new WVector2((float)rectangleGeometry.Rect.Width, (float)rectangleGeometry.Rect.Height);
compositionClip = compositor.CreateGeometricClip(compositionRectangleGeometry);
}
if (visual.Clip != compositionClip)
{
visual.Clip = compositionClip;
}
}
public static void SetClip(this UIElement element, CompositionClip value)
{
element.GetVisual().Clip = value;
}
public static void SetClip(this UIElement element, CompositionClip value)
{
element.GetVisual().Clip = value;
}
public static void SetClip(this DependencyObject element, CompositionClip value)
{
(element as UIElement).GetVisual().Clip = value;
}