Simon Mourier's Blog - How do I get stackpanel to resize to fit the controls it's stacking?

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How do I get stackpanel to resize to fit the controls it's stacking?

Jun 18, 2020 See the question and my original answer on StackOverflow

Depending on your setting, you can achieve that simply using StackPanel's alignments. For example this XAML

<Window Width="350" Height="350" ...> 
    <Grid>
        <StackPanel
            Background="Green">
            <Border
                Width="100"
                Height="100"
                Background="Blue" />
            <Border
                Width="100"
                Height="100"
                Background="Red" />
        </StackPanel>
    </Grid>
</Window>

Will create this (the panel stretches to parent's size):

And this panel:

<Window Width="350" Height="350" ...> 
    <Grid>
        <StackPanel
            HorizontalAlignment="Center"
            VerticalAlignment="Center"
            Background="Green">
            <Border
                Width="100"
                Height="100"
                Background="Blue" />
            <Border
                Width="100"
                Height="100"
                Background="Red" />
        </StackPanel>
    </Grid>
</Window>

Will create this (sized to the two contained Borders):