How to use the IsEnabled to disable the parts of an Expander, but not the whole thing?

Question

I have an expander with a custom template:

<ControlTemplate TargetType="{x:Type Expander}">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <Border Grid.Row="0">
            <DockPanel>
                <ToggleButton DockPanel.Dock="Right" Template="{DynamicResource ExpanderToggle}" />
                <ContentPresenter DockPanel.Dock="Right" ContentSource="Tag" />
                <ContentPresenter DockPanel.Dock="Left" ContentSource="Header">
            </DockPanel>
        </Border>
        <Border Visibility="Collapsed" Grid.Row="1">
            <ScrollViewer IsEnabled="True">
                <ContentPresenter IsEnabled="{TemplateBinding IsEnabled}" />
            </ScrollViewer>
        </Border>
    </Grid>
</ControlTemplate>

Basically, I'm attempting to make it so that if I set the IsEnabled property to false my scrollviewer still can scroll (it stays enabled, but other parts of my control disable). Any way to do that?

score 3 · Accepted Answer · edited May 23 '17 at 09:59

If Robert's answer doesn't work, you could always create an AttachedProperty called IsContentEnabled and bind your ContentPresenter's IsEnabled to that property.

<Expander local:IsContentEnabled="False" />

<ControlTemplate TargetType="{x:Type Expander}">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <Border Grid.Row="0">
            <DockPanel>
                <ToggleButton DockPanel.Dock="Right" Template="{DynamicResource ExpanderToggle}" />
                <ContentPresenter DockPanel.Dock="Right" ContentSource="Tag" />
                <ContentPresenter DockPanel.Dock="Left" ContentSource="Header">
            </DockPanel>
        </Border>
        <Border Visibility="Collapsed" Grid.Row="1">
            <ScrollViewer>
                <ContentPresenter IsEnabled="{TemplateBinding local:IsContentEnabled}" />
            </ScrollViewer>
        </Border>
    </Grid>
</ControlTemplate>

score 2 · Answer 2 · answered Oct 19 '11 at 13:35

Give your DockPanel a name. Then use e FindName (see http://joshsmithonwpf.wordpress.com/2007/06/28/how-to-use-findname-with-a-contentcontrol/) to get at that DockPanel at runtime. Set IsEnabled on it directly rather that on the higher level Expander control. Do the same for your ContentPresenter if appropriate.

How to use the IsEnabled to disable the parts of an Expander, but not the whole thing?

2 Answers2