VisualItemFormatting tooltips

[Matthew]

Hi There,

I'm working on a grid which has a GridViewComboBoxColumn. the column is often not wide enough the fit the item text. So i wanted to add a tool tip for each item in the list.
I found this article which seemed to be what i was after:
http://www.telerik.com/community/forums/winforms/dropdownlist-and-listcontrol/auto-horizontal-scroll-and-item-tooltip-in-radlistcontrol.aspx

but my code doesn't seem to work:

protected void rgDraft_CellEditorInitialized(object sender, GridViewCellEventArgs e)
{
    if (e.Column.Name == "Country")
    {
        RadDropDownListEditor editor = (RadDropDownListEditor)this.rgDraft.ActiveEditor;
        RadDropDownListEditorElement editorElement = (RadDropDownListEditorElement)editor.EditorElement;

        editorElement.VisualItemFormatting += new VisualListItemFormattingEventHandler(delegate(object formattingsender, VisualItemFormattingEventArgs args)
            {
                args.VisualItem.ToolTipText = args.VisualItem.Text;
            });
    }
}

Any idea why this doesn't work? I can do other things, like set the bgcolor to red and that works as expected

Many thanks,
Matt

[Stefan]

Hi Matthew,

Thank you for writing.

We are aware of this limitation and it is already logged in PITS. Here is a link where you can add your vote for it: http://www.telerik.com/support/pits.aspx#/public/winforms/7712.

Meanwhile, you can show the tooltips, by using the following code:

void radGridView1_CellEditorInitialized(object sender, GridViewCellEventArgs e)
{
    if (e.Column.Name == "combo")
    {
        RadDropDownListEditor editor = (RadDropDownListEditor)e.ActiveEditor;
        RadDropDownListEditorElement editorElement = (RadDropDownListEditorElement)editor.EditorElement;

        editorElement.Popup.ToolTipTextNeeded -= new Telerik.WinControls.ToolTipTextNeededEventHandler(Popup_ToolTipTextNeeded);
        editorElement.Popup.ToolTipTextNeeded += new Telerik.WinControls.ToolTipTextNeededEventHandler(Popup_ToolTipTextNeeded);
    }
}

ToolTip tip = new ToolTip();
void Popup_ToolTipTextNeeded(object sender, Telerik.WinControls.ToolTipTextNeededEventArgs e)
{
    RadListVisualItem item = sender as RadListVisualItem;

    if (item != null)
    {
        AssignTooltips(item);
        tip.Show(item.ToolTipText, this, this.PointToClient(Cursor.Position));
    }
}

private void AssignTooltips(RadListVisualItem item)
{
    if (item.AutoEllipsis = true && TextRenderer.MeasureText(item.Text, item.Font).Width > item.Size.Width)
    {
        item.ToolTipText = item.Text;
    }
    else
    {
        item.ToolTipText = "";
    }
}

I hope this helps. Let us know if you have any other questions.

Greetings,
Stefan
the Telerik team