WPF 堆栈面板可见性动画

Question

我有一个带有按钮的堆栈面板，单击该按钮后，堆栈面板就会消失。我想为隐藏的可见过渡表单设置动画，但无法实现。

我环顾了一会儿，撞到了一个看起来像这样的东西:

<StackPanel Margin="80,60,60,80" Background="Gray">
    <StackPanel.Triggers >

        <EventTrigger  > 
            <EventTrigger.Actions>
                <BeginStoryboard>
                    <Storyboard TargetProperty="Visibility">

                        <DoubleAnimation Duration="0:0:5:0" From="Visible" To="Hidden"/>

                    </Storyboard>
                </BeginStoryboard>
            </EventTrigger.Actions>
        </EventTrigger>

    </StackPanel.Triggers>
    <Button Name="buttonTop" Content="TOP" Margin="40,40,40,40" Click="buttonTop_Click" Width="131" />
</StackPanel>

当然，这还不是 100%。有任何想法吗？

Answer 1

您可以使用

<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ItemsHost"
                               Storyboard.TargetProperty="Visibility">
    <DiscreteObjectKeyFrame KeyTime="0:0:0" Value="{x:Static Visibility.Visible}"/>
</ObjectAnimationUsingKeyFrames>

这几乎是 Storyboard中的一个 setter，其中 KeyTime 描述了应该设置值的时间。
所以完整的 Storyboard应该是这样的:

<BeginStoryboard>
    <Storyboard>
        <DoubleAnimation Storyboard.TargetProperty="Opacity"
                         To="0" Duration="0:0:5.0"/>
        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility">
            <DiscreteObjectKeyFrame KeyTime="0:0:5.0" Value="{x:Static Visibility.Hidden}"/>
        </ObjectAnimationUsingKeyFrames>
    </Storyboard>
</BeginStoryboard>

编辑:如何在单击按钮时触发 Storyboard :

<Button Content="Button" HorizontalAlignment="Left" Margin="337,221,0,0" VerticalAlignment="Top" Width="75">
    <Button.Triggers>
        <EventTrigger RoutedEvent="Button.Click">
            <BeginStoryboard>
                <Storyboard>
                    <DoubleAnimation Storyboard.TargetProperty="Opacity"
                 To="0" Duration="0:0:5.0"/>
                    <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility">
                        <DiscreteObjectKeyFrame KeyTime="0:0:5.0" Value="{x:Static Visibility.Hidden}"/>
                    </ObjectAnimationUsingKeyFrames>
                </Storyboard>
            </BeginStoryboard>
        </EventTrigger>
    </Button.Triggers>
</Button>