Hello Ofer,
Thank you for writing.
When you start a drag operation in
RadTreeView, note that the selected node is currently noticed as
hovered. That is why the screen tip is closed on
MouseUp. You can find below a sample code snippet demonstrating how to hide the screen tip by handling the TreeViewElement.DragDropService.
PreviewDragOver event:
public Form1()
{
InitializeComponent();
this.radTreeView1.AllowDragDrop = true;
this.radTreeView1.ScreenTipNeeded += radTreeView1_ScreenTipNeeded;
this.radTreeView1.TreeViewElement.DragDropService.PreviewDragOver += DragDropService_PreviewDragOver;
}
private void DragDropService_PreviewDragOver(object sender, RadDragOverEventArgs e)
{
((ComponentBehavior)this.radTreeView1.Behavior).GetType().GetProperties(BindingFlags.NonPublic | BindingFlags.Instance);
PropertyInfo barProperty = ((ComponentBehavior)this.radTreeView1.Behavior).GetType().GetProperty("ScreenPresenter",
BindingFlags.NonPublic | BindingFlags.Instance);
Form screenTip = barProperty.GetValue(((ComponentBehavior)this.radTreeView1.Behavior), null) as Form;
screenTip.Hide();
}
RadOffice2007ScreenTipElement screenTip = new RadOffice2007ScreenTipElement();
Size size = new Size(120, 70);
Padding pad = new Padding(2);
private void radTreeView1_ScreenTipNeeded(object sender, Telerik.WinControls.ScreenTipNeededEventArgs e)
{
TreeNodeElement node = e.Item as TreeNodeElement;
if (node != null)
{
screenTip.MainTextLabel.Image = node.ImageElement.Image;
screenTip.MainTextLabel.TextImageRelation = TextImageRelation.ImageBeforeText;
screenTip.MainTextLabel.Padding = pad;
screenTip.MainTextLabel.Text = "This is " + node.ContentElement.Text;
screenTip.MainTextLabel.Margin = new System.Windows.Forms.Padding(10);
screenTip.CaptionLabel.Padding = pad;
screenTip.CaptionLabel.Text = node.ContentElement.Text;
screenTip.EnableCustomSize = true;
screenTip.AutoSize = false;
screenTip.Size = size;
node.ScreenTip = this.screenTip;
}
}
I hope this information helps. Should you have further questions I would be glad to help.
Regards,
Dess
Telerik
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