Disable autoscrolling on nodes with long text + tooltip

[Sergey]

Hi

I'm working with radtreeview and have nodes with long names (see the picture). When i click on such nodes radtreeview make horizontal autoscrolling and do not showing the tooltip. How can i disable autoscrolling (but scroller must be visible) and show tooltip for such items with its text). I set property ShowItemTooltip to TRUE, but tooltip is not showing.

Thanks.

 

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English (auto-detected) » Russian

 

[George]

Hello Sergey,

Thank you for writing.

In order to show tool tips, you need to set the ShowNodeToolTips property to true. Then you need to subscribe to the ToolTipTextNeeded​ event:

void TreeView_ToolTipTextNeeded(object sender, ToolTipTextNeededEventArgs e)
{
    if (sender is TreeNodeElement)
    {
        e.ToolTipText = (sender as TreeNodeElement).Data.Text;
    }
}

As to the autoscrolling, I am guessing that you refer to the case where you click a child node which's text is visually longer than its parent. In this case RadTreeView tries to position it and scrolls the horizontal scrollbar. This will require you to create a custom RadTreeView and override the EnsureNodeVisibleHorizontal method:

public class MyTree : RadTreeView
{
    protected override RadTreeViewElement CreateTreeViewElement()
    {
        return new MyTreeViewElement();
    }

    public override string ThemeClassName
    {
        get
        {
            return typeof(RadTreeView).FullName;
        }
        set
        {
        }
    }
}

public class MyTreeViewElement : RadTreeViewElement
{
    protected override void EnsureNodeVisibleHorizontal(RadTreeNode node, TreeNodeElement nodeElement)
    {
        //we stop the base logic here
    }

    protected override Type ThemeEffectiveType
    {
        get
        {
            return typeof(RadTreeViewElement);
        }
    }
}

I have also enclosed a small sample which demonstrates the above approaches.

Let me know if you require further assistance.

Regards,
George
Telerik