protected override void OnPreviewDragHint(PreviewDragHintEventArgs e)
{
if (!this.ShowDragHint)
{
e.DragHint = (Image)null;
e.UseDefaultHint = false;
}
TreeViewPreviewDragHintEventArgs dragHintEventArgs = new TreeViewPreviewDragHintEventArgs(e.DragInstance, DropPosition.None);
dragHintEventArgs.DragHint = e.DragHint;
dragHintEventArgs.UseDefaultHint = e.UseDefaultHint;
base.OnPreviewDragHint((PreviewDragHintEventArgs)dragHintEventArgs);
}
protected override void SetHintWindowPosition(Point mousePt)
{
this.owner.ElementTree.Control.PointToClient(mousePt);
TreeNodeElement dropTarget = this.DropTarget as TreeNodeElement;
if (dropTarget != null)
{
DropPosition dropPosition = this.GetDropPosition(dropTarget.PointFromScreen(mousePt), dropTarget);
TreeViewPreviewDragHintEventArgs e = new TreeViewPreviewDragHintEventArgs(this.Context as ISupportDrag, dropPosition);
this.OnPreviewDragHintWithDropPosition(e);
Image image1 = (Image)null;
if (e.UseDefaultHint)
{
switch (dropPosition)
{
case DropPosition.BeforeNode:
image1 = (Image)Telerik\u002EWinControls\u002EUI\u002EResources.RadTreeViewDropBefore;
break;
case DropPosition.AfterNode:
image1 = (Image)Telerik\u002EWinControls\u002EUI\u002EResources.RadTreeViewDropAfter;
break;
case DropPosition.AsChildNode:
image1 = (Image)Telerik\u002EWinControls\u002EUI\u002EResources.RadTreeViewDropAsChild;
break;
}
if (image1 != null && this.dragHintImageCache != null && this.ShowDragHint)
{
Image image2 = (Image) new Bitmap(image1.Width + this.dragHintImageCache.Width, Math.Max(image1.Height, this.dragHintImageCache.Height));
using (Graphics graphics = Graphics.FromImage(image2))
{
graphics.Clear(Color.White);
graphics.DrawImage(image1, new RectangleF(0.0f, (float)(image2.Height - image1.Height) / 2f, (float)image1.Width, (float)image1.Height));
graphics.DrawImage(this.dragHintImageCache, new RectangleF((float)image1.Width, (float)(image2.Height - this.dragHintImageCache.Height) / 2f, (float)this.dragHintImageCache.Width, (float)this.dragHintImageCache.Height));
graphics.DrawRectangle(Pens.LightGray, new Rectangle(0, 0, image2.Width - 1, image2.Height - 1));
}
this.HintWindow.BackgroundImage = image2;
}
base.SetHintWindowPosition(new Point(mousePt.X - 20, mousePt.Y));
return;
}
this.HintWindow.BackgroundImage = e.DragHint;
}
base.SetHintWindowPosition(new Point(mousePt.X, mousePt.Y));
}
protected virtual void OnPreviewDragHintWithDropPosition(TreeViewPreviewDragHintEventArgs e)
{
base.OnPreviewDragHint((PreviewDragHintEventArgs)e);
}
