Hi,
Suppose I have:
public class CustomPanel : StackPanel
{
public Image Image
{
get { return _image };
}
}
And I have this style:
<Style TargetType="{x:Type CustomPanel}">
<Setter Property="Image.Width" Value="100"/>
</Style>
That seems to set the width of the panel rather than the width of the image. How can I specifically target the image width and set the panel width separately I tried this but it gives a compile error:
<Style TargetType="{x:Type CustomPanel}">
<Setter Property="(Image).Width" Value="100"/>
</Style>
Thanks,
Kent Boogaart
Access sub-properties in <Setter/>
dezrtluver
We're looking at it, but no plans for this version of WPF.
The workaround that frequently works is to use a Storyboard. It's a lot more to type, but often ends up accomplishing the same result. The idea is to have the animation start right away, take effect immediately (not over time), and keep running forever, or in this case as long as the style is applied. In the below example, you can put any object type you want inside the <DiscreteObjectKeyFrame.Value>:
<
Pagexmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Background="White">
<
Page.Resources><Style TargetType="{x:Type Button}">
<Style.Triggers>
<EventTrigger RoutedEvent="Button.Loaded">
<BeginStoryboard>
<Storyboard TargetProperty="Background.Color">
<ObjectAnimationUsingKeyFrames >
<DiscreteObjectKeyFrame KeyTime="0:0:0" >
<DiscreteObjectKeyFrame.Value>
<Color>Blue</Color>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</
Style.Triggers></Style>
</Page.Resources>
<
Button Background="Red">Click</Button></
Page>mjt
While I did think I actually used this syntax in Setters... it was in fact in DataTrigger!!!
Sorry about that mistake and I hope I did not caused you too much pain, fooling around with Setters.
riemerg
Unfortunately you can't access sub-properties in a Setter.Property or Trigger.Property (you can in Bindings and Storyboards, though).
In the setter syntax, if you have Property="Foo.Bar", it's interpreted as "Class.Property". So your Setter is really setting the Image class' Width property, which is synonomous with Panel.Width, since they both inherit it from FrameworkElement.
Tailor
Have you tried changing the "Stretch" property of the Image so it can resize accordingly
<Style TargetType="{x:Type CustomPanel}">
<Setter Property="Image.Width" Value="100"/>
<Setter Property="Image.Stretch" Value="Fill" /> <!-- or "UniformFill" if you want to preserve aspect ratio -->
</Style>
Jiajia
No harm done - I was asleep during both those replies :)
That's an interesting limitation - are there plans to allow the same ability to access subproperties in setters as in bindings and storyboards
Thanks,
Kent