Binding Button IsEnabled to StackPanel has Children

Question

I'm wondering if I can bind my Button isEnabled to my StackPanel Children (has children). If the stackpanel has children, then my button is enabled, no children my button is disabled. Currently I just handle this in code, but I started wondering if this was something I could bind. Thanks for any thoughts...

Answer 1

Actually since you deal with a bool you can invert the logic and do it without converters:

<StackPanel Name="sp" />
<Button Content="A Button">
    <Button.Style>
        <Style TargetType="{x:Type Button}">
            <Style.Triggers>
                <DataTrigger Binding="{Binding ElementName=sp, Path=Children.Count}" Value="0">
                    <Setter Property="IsEnabled" Value="False"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </Button.Style>
</Button>

Using this you run into some problems in terms of getting updates since Children.Count is not a DP, you can use an ItemsControl though to get around that (it pretty much behaves like a StackPanel by default):

<ItemsControl Name="ic" />
<Button Content="A Button">
    <Button.Style>
        <Style TargetType="{x:Type Button}">
            <Style.Triggers>
                <DataTrigger Binding="{Binding ElementName=ic, Path=Items.Count}" Value="0">
                    <Setter Property="IsEnabled" Value="False"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </Button.Style>
</Button>