DataTrigger 一些新知识

当需要集合里面某个数据变化的时候进行动画，用到了DataTrigger,其中可以用到DataTrigger.EnterActions来实现。

与之配对的有一个<DataTrigger.ExitActions>。

EnterActions关于其中msdn解释为：Gets a collection of TriggerAction objects to apply when the trigger object becomes active。没看明白？

 

                <DataTrigger Binding="{Binding IsShow}"  Value="True">
                    <DataTrigger.EnterActions>
                        <BeginStoryboard Storyboard="{StaticResource SB_Stop}"></BeginStoryboard>                       
                    </DataTrigger.EnterActions>
                    <DataTrigger.ExitActions>
                        <BeginStoryboard Storyboard="{StaticResource SB_Stop}"></BeginStoryboard>
                    </DataTrigger.ExitActions>
                </DataTrigger>

刚开始我以为绑定了以上还应该进行对应当返回动作如下：

                <DataTrigger Binding="{Binding IsShow}"  Value="false">
                    <DataTrigger.EnterActions>
                        <BeginStoryboard Storyboard="{StaticResource SB_Stop}"></BeginStoryboard>                       
                    </DataTrigger.EnterActions>
                    <DataTrigger.ExitActions>
                        <BeginStoryboard Storyboard="{StaticResource SB_Stop}"></BeginStoryboard>
                    </DataTrigger.ExitActions>
                </DataTrigger>

 

后面经过实验，只进行第一次即可。IsShow是一个属性，bool类型。理解为：当true即enter,false的时候就Exit