WPF常用TriggerAction用法 (一)

Microsoft.Expression.Interactivity 常用TriggerAction-> CallMethodAction ChangePropertyAction ControlStoryboardAction GoToStateAction

1，CallMethodAction 用于调用后台和DataContext中公用，无参数，无返回值的方法.这里扩展了一个CallMethodTrigger 可以调用有返回值和参数的方法。xaml中使用方法：

 <Button Background="{StaticResource TabItemSelectedBackground}" Height="40" MinWidth="80" Content="CallMethodFromCode" Padding="10 0">
        <i:Interaction.Triggers>
            <i:EventTrigger EventName="Click">
               <ei:CallMethodAction MethodName="MethodFromCode" TargetObject="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Window}}"/>
               <ei:CallMethodAction MethodName="MethodFromCode" TargetObject="{Binding ElementName=window}"/>
                </i:EventTrigger>
         </i:Interaction.Triggers>
 </Button>

2，ChangePropertyAction 用于更改界面元素的属性和后台代码公开属性。界面元素属性一般要求为依赖属性。（附加属性也可。）xaml中使用方法：

   <ToggleButton Background="Orange" Height="40" MinWidth="80" Content="ChangeElementProperty" Padding="10 0">
       <i:Interaction.Triggers>
         <i:EventTrigger EventName="Checked">
             <ei:ChangePropertyAction TargetName="br" PropertyName="Background" Value="orange"/>
             <ei:ChangePropertyAction TargetName="tb" PropertyName="Text" Value="orange"/>
         </i:EventTrigger>
         <i:EventTrigger EventName="Unchecked">
             <ei:ChangePropertyAction TargetName="br" PropertyName="Background" Value="Red"/>
             <ei:ChangePropertyAction TargetName="tb" PropertyName="Text" Value="Red"/>
       </i:EventTrigger>
      </i:Interaction.Triggers>
</ToggleButton>

3，ControlStoryboardAction用于界面控制可访问动画的播放暂停等操作。xaml中使用方法：

   <Button Background="{StaticResource TabItemSelectedBackground}" Height="40" MinWidth="80" Content="ControlStoryboard Pause" Margin="10 0 0 0"  Padding="10 0">
       <i:Interaction.Triggers>
           <i:EventTrigger EventName="Click">
              <ei:ControlStoryboardAction ControlStoryboardOption="Pause" Storyboard="{StaticResource ChnageWidth1}"></ei:ControlStoryboardAction>
           </i:EventTrigger>
       </i:Interaction.Triggers>
    </Button>

　　

4，GoToStateAction 切换可访问的两个VisulState 可视化的状态，一般也通过动画实现。xaml中使用方法：

   <ToggleButton Background="Orange" Margin="0 0 10 0" Height="30" MinWidth="80" Content="GoToState" Padding="10 0">
        <i:Interaction.Triggers>
            <i:EventTrigger EventName="Checked">
                <ei:GoToStateAction StateName="ClickState" UseTransitions="{Binding UseTransitions}"/>
            </i:EventTrigger>
            <i:EventTrigger EventName="Unchecked">
                <ei:GoToStateAction StateName="NormalState" />
            </i:EventTrigger>
       </i:Interaction.Triggers>
   </ToggleButton>

 下载 https://files.cnblogs.com/files/yk250/BlendBehaviorsDemo.rar