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c#wpfparentchildrenviewport3d

<Viewport3D>: Hidden element identification

I have a XAML layout:

<f:FlipPanel x:Name="flipper" Height="90" Width="90">
    <f:FlipPanel.Front>
        <Canvas x:Name="Empty_Frame" Visibility="Visible">
            <Path Stroke="#FFBCC2AB" StrokeThickness="2">
                <Path.Data>
                    <GeometryGroup FillRule="EvenOdd">

                    ... <!-- There are a lot of geometric elements -->

        </Canvas>
    </f:FlipPanel.Front>
    <f:FlipPanel.Back>

    ... <!-- There are a lot of geometric elements -->

    </f:FlipPanel.Back>
    </f:FlipPanel>

FlipPanel is a complex component taken from a third-party library. During execution, I need to replace the <Canvas> with another set of elements. "Search-delete" code does not work:

var ecanvas = flipper.Children.OfType<Canvas>().FirstOrDefault(x => x.Name == "Empty_Frame");
flipper.Children.Remove(ecanvas);

The reason lies in the hidden intermediate element <Viewport3D>, which is located on the panel.

Question: How can I get a link to this hidden element to work with it (add and remove elements)?

Solution

  • I don't know how FlipPanel works, but actually you don't add Canvas to its Children collection, but put it to FlipPanel's 'Front' property. If you want to remove canvas, try the following:

    flipper.Front = null;

    And in order to put a new element there:

    flipper.Front = myNewElement;