问题
I'm very happy with my small collection of Blend behaviors, actions and triggers - they are easy to use and powerful. But I still can't figure out how to avoid applying them on per element basis. For example, if I have a behavior as such:
<Rectangle>
<i:Interaction.Behaviors>
<il:MouseDragElementBehavior/>
</i:Interaction.Behaviors>
</Rectangle>
and I have a few draggable rectangles in my Window, each of them has to have the above markup to be draggable. What I would like to do is to be able to write something like this:
<Style x:Key="RectangleStyle" TargetType="{x:Type Rectangle}">
<Setter Property="i:Interaction.Behaviors"
Value="il:MouseDragElementBehavior"/>
</Style>
It could be style, template, or some other way to avoid behavior or action markup repetition. The best solution I came up so far is creating a special behavior for the container (when attached, it enumerates children attaching to the children events). Any ideas?
回答1:
I ran into the same problem and I posted on my blog on how to create an attached property to work around this shortcoming of the Blend SDK.
回答2:
I haven't tried it, but what I would probably do is create an attached property that can hold a collection of Behaviors. In the property changed handler of that property, I would enumerate the collection and add each of the behaviours to the real Interation.Behaviors property. It's a bit messy, but it ought to work.
Update
This approach won't work without a good deal more work: the problem is that Behaviors and Triggers can only be attached to one object at a time. This is probably why the limitation on applying them using a style exists in the first place. To get this to work you would need to create some kind of Trigger or Behavior factory.
回答3:
You could create your own class that inherits from Rectangle and apply the behavior there.
来源：https://stackoverflow.com/questions/1252277/is-it-possible-to-apply-blend-behavior-using-style-or-template