'Graying Out' a WPF button image?

I have a simple Button control that contains an Image object as its content. I want so set the Image opacity to 0.5 when the Button is disabled to provide an additional visual cue as to the Button status.

What is the simplest way to accomplish that result in XAML? Thanks for your help.

Use a trigger in the Image style. (It would be more natural to put it in the Button style, but the Button style can't easily affect the Image for annoying technical reasons. It could be done in the Button's ControlTemplate but that's overkill for what you want here.)

<Button>
  <Image Source="something.png">
    <Image.Style>
      <Style TargetType="Image">
        <Style.Triggers>
          <Trigger Property="IsEnabled" Value="False">
            <Setter Property="Opacity" Value="0.5" />
          </Trigger>
        </Style.Triggers>
      </Style>
    </Image.Style>
  </Image>
</Button>

Note we are taking advantage here of the fact that the Image will be disabled when the Button is disabled, so we can trigger directly on the Image's own IsEnabled property. In other cases, the Button property we want to trigger on might not be inherited by the Image; in that case, we'd need to use a DataTrigger with the FindAncestor RelativeSource to bind to the containing button.

If you want something more generic, put this in your resources section for your window or UserControl .

<UserControl.Resources>     
    <Style x:Key="ImageEnabled" TargetType="Image">
        <Style.Triggers>
            <Trigger Property="IsEnabled" Value="False">
                <Setter Property="Opacity" Value="0.25"></Setter>
            </Trigger>
        </Style.Triggers>
    </Style>
</UserControl.Resources>

And in the actual button just do this

<Button>
    <Image Source="{StaticResource LinkImage}" Style="{StaticResource ImageEnabled}"/>
</Button>

Here's a more generic style you can apply:

<Style TargetType="Button">
    <Style.Resources>
        <Style TargetType="Image">
            <Style.Triggers>
                <Trigger Property="IsEnabled" Value="False">
                    <Setter Property="Opacity" Value="0.5" />
                </Trigger>
            </Style.Triggers>
        </Style>
    </Style.Resources>
</Style>

If you want the entire button greyed out, styling the button itself has worked for me. It seems to grey out all button content.

                    <Button.Style>
                        <Style TargetType="Button">
                            <Style.Triggers>
                                <Trigger Property="IsEnabled" Value="False">
                                    <Setter Property="Opacity" Value=".75"/>
                                </Trigger>
                            </Style.Triggers>
                        </Style>
                    </Button.Style>

Comments
  • Couldn't make this work. This worked for me: stackoverflow.com/questions/4532943/…
  • Great answer! Accepted and +1 from me.
  • Magic solution :). I like that.
  • FWIW, when using XAML images in a ControlTemplate, you can add this to the <Viewbox.Style>. I used this to make toolbar buttons fade when disabled.
  • Note that this only works if the Image is a direct child of button. In my case, the button content is wrapped by a StackPanel and didn't worked.
  • @JonePolvora thank you for clarifying. I was confused why I failed to benefit from this post until I saw your post.
  • This does work. Note however that it conflicts with use of an alternative theme (like here: stackoverflow.com/questions/13156199/wpf-options-classic-theme) such that the button seems to revert to a 2D look & feel vs. the "Classic" theme I was using.