CODEWITHSUNDEEP
wpfxamlpopup
dotNET
dotNET

Reputation: 35450

Popup is not a proper child of its parent window?

I'm trying to create a stylish window with icon in the top-right corner that is partly outside the window boundary. Since this is not directly possible (content falling outside the window is clipped), I'm using a Popup control for it.

<Popup Placement="Right" HorizontalOffset="-80" VerticalOffset="-40" IsOpen="True" AllowsTransparency="True"
       PlacementTarget="{Binding RelativeSource={RelativeSource AncestorType=Grid}}">
  <Image Source="pack://application:,,,/graphics/AdminIcon.png" Stretch="None" />
</Popup>

It works fine, as long as I don't switch between windows. Thereupon it looks like the Popup is neither a proper child of the Window, nor a fully separate window of its own; something in-between.

I'll try to explain it with two images:

Image1: Window loaded and popup showing nicely in the right-top corner:

Image1: Window loaded

Image2: ALT + TAB: Notepad somehow injects itself between Popup and Window

Image2: Notepad between popup and window

How do I solve this problem?

Upvotes: 0

Views: 385

Answers (1)

Clemens
Clemens

Reputation: 128136

Instead of a Popup you may use a borderless, transparent Window:

<Window ...
    WindowStyle="None" AllowsTransparency="True" Background="{x:Null}"
    MouseLeftButtonDown="Window_MouseLeftButtonDown">
    <Grid>
        <Grid Margin="0,20,0,0" Background="White">
            ... window content goes here     
        </Grid>
        <Image
            Source="/graphics/AdminIcon.png" Stretch="None"
            HorizontalAlignment="Right" VerticalAlignment="Top" />

    </Grid>
</Window>

with this MouseLeftButtonDown handler

private void Window_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    DragMove();
}

and perhaps a close button somewhere.

Upvotes: 1

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