public static DropHitTestResults HitTest(FrameworkElement element, Point point)
{
DropHitTestResults dropHitTestResults = DropHitTestResults.None;
if (element != null)
{
double actualWidth = element.ActualWidth;
double actualHeight = element.ActualHeight;
if (point.X >= 0.0 && point.X < actualWidth && (point.Y >= 0.0 && point.Y < actualHeight))
{
if (point.Y < actualHeight / 2.0)
{
dropHitTestResults |= DropHitTestResults.UpperHalf;
}
else
{
dropHitTestResults |= DropHitTestResults.LowerHalf;
}
if (point.Y > actualHeight / 4.0 && point.Y < actualHeight * 3.0 / 4.0)
{
dropHitTestResults |= DropHitTestResults.CenterHalf;
}
}
}
return(dropHitTestResults);
}
public override void OnDragEnter(DragEventArgs e)
{
base.OnDragEnter(e);
this.LastHitTestResult = this.HitTestResult;
if (this.DropTarget != null)
{
this.HitTestResult = ListItemDragDropHandler.HitTest(this.DropTarget, e.GetPosition((IInputElement)this.DropTarget));
}
else
{
this.HitTestResult = DropHitTestResults.None;
}
}
public override void OnDragOver(DragEventArgs e)
{
base.OnDragOver(e);
this.LastHitTestResult = this.HitTestResult;
if (this.DropTarget != null)
{
this.HitTestResult = ListItemDragDropHandler.HitTest(this.DropTarget, e.GetPosition((IInputElement)this.DropTarget));
if (this.hoverHelper == null)
{
return;
}
this.hoverHelper.HandleMouseMove(Mouse.GetPosition((IInputElement)this.DropTarget), (this.HitTestResult & DropHitTestResults.CenterHalf) != DropHitTestResults.None);
}
else
{
this.HitTestResult = DropHitTestResults.None;
}
}
public override void OnDragLeave(DragEventArgs e)
{
this.LastHitTestResult = this.HitTestResult = DropHitTestResults.None;
base.OnDragLeave(e);
}