Manually hiding a ScreenTip

[Ofer]

Hi

I'm using a RadOffice2007ScreenTipElement with a RadTreeView, showing it using ScreenTipNeeded and everything is working as expected.

I do have a slight issue - if i start to Drag&Drop, the screen tip will remain visible the whole time (and block my view of other tree elements). I haven't been able to make it disappear. Is there a way to manually remove a screentip while the TreeView is still pressed/active (due to dragging)? 

[Dess | Tech Support Engineer, Principal]

Hello Ofer,

Thank you for writing.

When you start a drag operation in RadTreeView, note that the selected node is currently noticed as . 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

[Ofer]

Quite a hack, but it works :)

Using reflection to get properties is a bit problematic (Telerik has a history of renaming/deprecating) so it will be nice it there will be an easier way to do so in the future - just add a "Hide()" method to RadOffice2007ScreenTipElement.

Thanks 

[Dess | Tech Support Engineer, Principal]

Hello Ofer,

Thank you for writing back.

I have logged it in our feedback portal. You can track its progress, subscribe for status changes and add your vote/comment to it on the following link - feedback item.

I have also updated your Telerik points.

If you have any additional questions, please let me know.
Regards,
Dess
Telerik