Question

I am trying to get the position of user control via TransformToVisual method using this line of code:

this.TransformToVisual(ParentElement).Transform(new Point());

If the control is defined in XAML, coordinates are all right. But now I want to define controls dynamicaly like this:

stackPanel.Children.Add(new Control());

The coordinates are shifted and the TransformToVisual method is ignoring margins and aligns (returns top-left corner of stackpanel).

The XAML hierarchy is following:

<Grid x:Name="ParentElement">
    <StackPanel>
        <StackPanel>
            <Border>
                <StackPanel>
                    <TextBlock  />
                    <StackPanel x:Name="stackPanel" />
                </StackPanel>
            </Border>
        </StackPanel>
    </StackPanel>
</Grid>

So my question is: is there any way to get the coordinates properly again?

Thanks, kwitee

Answer 1

I was able to fix the issue myself:

If I call UpdateLayout() method before calling TransformToVisual(), coordinates are no longer bad. There was some other minor issue with ActualWidth and height properties, which were returned as zeros. I fixed that by calling these properties in Dispatcher.BeginInvoke delegate.