/// <summary>
/// Gets if drop position is directly over element
/// </summary>
/// <param name="dropPosition">Drop position</param>
/// <param name="element">element to check whether or not the drop position is directly over or not</param>
/// <param name="relativeToElement">element to which the drop position is related</param>
/// <returns>drop position is directly over element or not</returns>
public static bool DirectlyOverElement(this Point dropPosition, UIElement element, UIElement relativeToElement)
{
if (element == null)
{
return(false);
}
var relativeItemPosition = element.TranslatePoint(new Point(0, 0), relativeToElement);
var relativeDropPosition = new Point(dropPosition.X - relativeItemPosition.X, dropPosition.Y - relativeItemPosition.Y);
return(VisualTreeExtensions.GetVisibleDescendantBounds(element).Contains(relativeDropPosition));
}
// Helper to generate the image - I grabbed this off Google
// somewhere. -- Chris Bordeman [email protected]
private static BitmapSource CaptureScreen(Visual target, FlowDirection flowDirection)
{
if (target == null)
{
return(null);
}
var bounds = VisualTreeHelper.GetDescendantBounds(target);
var cropBounds = VisualTreeExtensions.GetVisibleDescendantBounds(target);
var dpiScale = VisualTreeHelper.GetDpi(target);
var dpiX = dpiScale.PixelsPerInchX;
var dpiY = dpiScale.PixelsPerInchY;
var dpiBounds = DpiHelper.LogicalRectToDevice(cropBounds, dpiScale.DpiScaleX, dpiScale.DpiScaleY);
var pixelWidth = (int)Math.Ceiling(dpiBounds.Width);
var pixelHeight = (int)Math.Ceiling(dpiBounds.Height);
if (pixelWidth < 0 || pixelHeight < 0)
{
return(null);
}
var rtb = new RenderTargetBitmap(pixelWidth, pixelHeight, dpiX, dpiY, PixelFormats.Pbgra32);
var dv = new DrawingVisual();
using (var ctx = dv.RenderOpen())
{
var vb = new VisualBrush(target);
// vb.ViewportUnits = BrushMappingMode.Absolute;
// vb.Viewport = bounds;
if (flowDirection == FlowDirection.RightToLeft)
{
var transformGroup = new TransformGroup();
transformGroup.Children.Add(new ScaleTransform(-1, 1));
transformGroup.Children.Add(new TranslateTransform(bounds.Size.Width, 0));
ctx.PushTransform(transformGroup);
}
ctx.DrawRectangle(vb, null, new Rect(new Point(), bounds.Size));
}
rtb.Render(dv);
return(rtb);
}
