How to clip textblock inside proportional grid?

Question

In a UserControl that's inside a ListBox, I've got a TextBlock with proportional width (Width="*") inside a Grid that I want to take the remaining width of the grid, but whenever I resize the ListBox to a size that would clip that TextBlock's content I get a scroll bar. How can I clip the TextBlock width so that I don't get an horizontal scroll bar? Ideally clipping it with ellipsis.

EDIT: Forgot to mention the ListBox.

Answer 1

The listbox is scrolling because it's default behavior is to have HorizontalScrollBarVisibility to Auto.

Try setting this property to disabled:

<ListBox ScrollViewer.HorizontalScrollBarVisibility="Disabled">

As for clipping to an ellipse, this is more complex. You can clip to an ellipsis quite easily using the Clip property:

            <TextBlock Text="Some very long thing that I'm putting in here to clip" Background="Blue">
                <TextBlock.Clip>
                    <EllipseGeometry Center="100,8" RadiusX="100" RadiusY="8" />
                </TextBlock.Clip>
            </TextBlock>

However, to keep the Center, RadiusX and RadiusY in order you'll have to bind it to the height and width of the text box (perhaps using a converter to half these values).