public static System.Drawing.Rectangle GetScreenBoundingRectangle(UIElement target)
{
PresentationSource source = PresentationSource.FromVisual(target);
if (source == null)
{
throw new InvalidOperationException("The specified UiElement is not connected to a rendering Visual Tree.");
}
Matrix transform;
try
{
System.Windows.Media.GeneralTransform gt =
target.TransformToAncestor(source.RootVisual);
System.Windows.Media.Transform t = gt as System.Windows.Media.Transform;
if (t != null)
{
transform = t.Value;
}
else
{
throw new System.ApplicationException("//TODO: Handle GeneralTransform Case - introduced by Transforms Breaking Change");
}
}
catch (InvalidOperationException)
{
throw new InvalidOperationException("The specified UiElement is not connected to a rendering Visual Tree.");
}
Rect targetRect = new Rect(new Point(), target.RenderSize);
targetRect.Transform(transform);
Point rootOffset = targetRect.TopLeft;
System.Windows.Media.CompositionTarget vm = source.CompositionTarget;
rootOffset = vm.TransformToDevice.Transform(rootOffset);//vm.DeviceUnitsFromMeasureUnits(rootOffset);
System.Drawing.Point topLeft = new System.Drawing.Point((int)rootOffset.X, (int)rootOffset.Y);
User32.ClientToScreen(((System.Windows.Interop.HwndSource)source).Handle, ref topLeft);
System.Drawing.Rectangle rect = new System.Drawing.Rectangle(topLeft, new System.Drawing.Size(Convert.ToInt32(Monitor.ConvertLogicalToScreen(Dimension.Width, target.RenderSize.Width)), Convert.ToInt32(Monitor.ConvertLogicalToScreen(Dimension.Height, target.RenderSize.Height))));
return(rect);
}
void EnsureTransformMatrices()
{
if (this.compositionTarget == null)
{
var source = PresentationSource.FromVisual(this);
if (source != null)
{
this.compositionTarget = source.CompositionTarget;
this.xformFromDevice = this.compositionTarget.TransformFromDevice;
this.xformToDevice = this.compositionTarget.TransformToDevice;
}
}
}
