I've got a WPF window with SizeToContent="Height"
. This window contains an <Expander />
that displays a list of recent activity. What I'd like is when the expander is expanded the window grows in size proportionally. When hidden the window again resizes proportionally. If the window is resized the expander and it's contained list view should grow to use the new space. (don't mind the colors there there to help me figure this out):
Normal View
alt text http://www.deploylx.com/so/wpfexpander/Open.png
Collapsed
alt text http://www.deploylx.com/so/wpfexpander/Closed.png
Resized to new space
alt text http://www.deploylx.com/so/wpfexpander/Expanded.png
So far this works great. The problem comes when the <Expander />
is collapsed after the window is resized. Rather than the window collapsing again, the list view is simply hidden:
Collapsed after Resize
alt text http://www.deploylx.com/so/wpfexpander/Collapsed.png
My intuition tells me that the Height
of the window is being set when the window resizes and thus overrides the SizeToContent
property. So, how can I get the window to keep it's size to content behavior after it's been resized?
Current XAML:
<Window x:Class="DeployLX.Licensing.Nlm.Admin.v3.DashboardWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Dashboard" Width="504" SizeToContent="Height" Height="275">
<DockPanel>
<Menu DockPanel.Dock="Top">
<MenuItem Header="_File">
<MenuItem Header="E_xit" Command="{Binding Path=CloseCmd}" />
</MenuItem>
</Menu>
<Grid DockPanel.Dock="Top" Margin="8" ShowGridLines="True">
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<Grid Grid.RowSpan="2" Grid.Row="0" Grid.Column="0" Margin="0,0,8,0">
<Rectangle Fill="Red" />
<TextBlock>ActiveCount</TextBlock>
</Grid>
<Grid Grid.Row="0" Grid.Column="1" Margin="0,0,0,4">
<Rectangle Fill="Green" />
<TextBlock>Authorization</TextBlock>
</Grid>
<Grid Grid.Row="1" Grid.Column="1" Margin="0,4,0,0">
<Rectangle Fill="Blue" />
<TextBlock>Authorization</TextBlock>
</Grid>
</Grid>
<Expander Header="Recent Activity" Margin="8" IsExpanded="True">
<ListView IsSynchronizedWithCurrentItem="True" MinHeight="100">
<ListView.View>
<GridView>
<GridViewColumn Header="Status"/>
</GridView>
</ListView.View>
</ListView>
</Expander>
</DockPanel>
</Window>
UPDATE: I've tried listening to the Collapsed event of the expander and resetting the Windows SizeToContent
property. This almost works. It will cause it to collapse the window again but when expanded again it goes back to the original 100 pixel height. While it's feasible to store and capture this info it smells hacky and prone to errors.
You have to make your window non-resizeable if you're going to use SizeToContent. Also, you shouldn't use SizeToContent="Height", and then set an explicit Height. Think about it - which one should WPF believe for the window height, the user's setting or the Content? It can't just switch back and forth between the two.