WPF XAML动画当绑定布尔变为false时,如何停止它?

时间:2013-11-05 14:13:02

标签: wpf xaml animation

我希望动画在布尔CanAnimate变为false时停止。它从true开始,那么当CanAnimate为假时我怎么告诉它停止? (CanAnimate bool设置在SelectedItem setter中)

<Border BorderBrush="Black" BorderThickness="2" Margin="1" Name="ReviewNote">
    <Border.Style>
        <Style TargetType="Border">
           <Style.Triggers>
               <DataTrigger Binding="{Binding CanAnimate}" Value="True">
                   <DataTrigger.EnterActions>
                       <BeginStoryboard>
                           <Storyboard>
                              <DoubleAnimation 
                                    Storyboard.TargetProperty="(Border.Opacity)"
                                    From="1.0" To="0.0" AutoReverse="True" 
                                    RepeatBehavior="Forever" />
                            </Storyboard>
                       </BeginStoryboard>
                   </DataTrigger.EnterActions>
               </DataTrigger>
            </Style.Triggers>
         </Style>
    </Border.Style>
   <TextBlock/>
</Border>

1 个答案:

答案 0 :(得分:2)

您可以尝试使用DataTrigger上的ExitActions来停止动画,方法是覆盖另一个动画。例如:

<DataTrigger Binding="{Binding CanAnimate}" Value="True">
   <DataTrigger.EnterActions>
       <BeginStoryboard>
           <Storyboard>
              <DoubleAnimation 
                    Storyboard.TargetProperty="(Border.Opacity)"
                    From="1.0" To="0.0" AutoReverse="True" 
                    RepeatBehavior="Forever" />
            </Storyboard>
       </BeginStoryboard>
   </DataTrigger.EnterActions>
   <DataTrigger.ExitActions>
        <BeginStoryboard>
           <Storyboard>
              <DoubleAnimation 
                    Storyboard.TargetProperty="(Border.Opacity)"
                    From="0.0" To="0.0" Duration="0:0:0.0" FillBehavior="HoldEnd" />
            </Storyboard>
       </BeginStoryboard>
   </DataTrigger.ExitActions>
</DataTrigger>

或者,有一种方法可以按名称停止XAML中的故事板,同样可以使用ExitActions。 This previous question显示了方式。

希望这有帮助!