private void AssociatedObject_GiveFeedback(object sender, GiveFeedbackEventArgs e)
{
if (!IsDropPreviewEnabled)
{
return;
}
if (_cursorWindow == null)
{
if (e.Source is FrameworkElement element && element != null)
{
var rtb = WPFHelper.GetRenderTargetBitmap(element);
var shadowAreaSize = (double)AssociatedObject.FindResource("DragWindowShadowAreaSize");
_cursorWindow = new DragImage()
{
Title = $"{AppSettings.AppTitle} cursor",
Width = rtb.Width + shadowAreaSize * 2d,
Height = rtb.Height + shadowAreaSize * 2d
};
_cursorWindowXHotSpot = -shadowAreaSize / 2d + 2d; // TODO: 2d gap could depends on system cursor size
_cursorWindowYHotSpot = -shadowAreaSize / 2d + 2d;
_cursorWindow.IMG.Source = rtb;
_cursorWindow.BackImg.Source = WPFHelper.GetImageMask(rtb);
}
}
var p = new NativeTypes.POINT();
GetCursorPos(ref p);
if (_cursorWindow != null)
{
var x = p.X - _cursorWindow.ActualWidth - _cursorWindowXHotSpot;
var y = p.Y - _cursorWindow.ActualHeight - _cursorWindowYHotSpot;
_cursorWindow.SetPos(x, y, (IntPtr)SpecialWindowHandles.HWND_TOP);
if (!_cursorWindow.IsVisible)
{
_cursorWindow.Show();
}
}
if (CanDropOnDesktop && CheckIsOverDesktop(p.X, p.Y))
{
e.UseDefaultCursors = false;
Mouse.SetCursor(Cursors.Hand);
e.Handled = true;
}
}