如何反转 WPF Storyboard 动画?

发布于 2024-10-11 06:12:57 字数 190 浏览 4 评论 0原文

我在 Expression Blend 4 中的图像上创建了 WPF Storyboard 动画。悬停时,图像逐渐模糊。当鼠标离开图像时,有什么方法可以撤消或反转故事板吗?我可以让它触发 Storyboard.Remove() 但这实际上不会向后播放 Storyboard。

有什么方法可以在 Expression Blend 4 中实现这一目标吗?

I've created a WPF Storyboard animation on an image in Expression Blend 4. On hover, the image gradually blurs. Is there any way I can have the Storyboard be undone or reversed when the mouse leaves the image? I could make it trigger Storyboard.Remove() but that wouldn't actually play through the Storyboard backwards.

Is there any way I can accomplish that within Expression Blend 4?

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荒人说梦 2024-10-18 06:12:57

由于您使用的是 Blend,因此您应该利用 Blend 对 VisualStateManager 的支持。您所要做的就是描述对象在各种状态下的外观,例如 MouseOverNormal 以及各种状态之间的转换有多长,以及视觉状态管理器找出如何在状态之间转换。

图像没有任何视觉状态,但您可以编辑 Button 模板并将其内容设为图像,然后编辑按钮的状态。我已经完成了此操作并清理了 XAML 以演示该技术:

<Grid>
    <Grid.Resources>
        <Style x:Key="ButtonStyle1" TargetType="{x:Type Button}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">
                        <Image x:Name="image" Height="100" Width="Auto" Source="http://thecybershadow.net/misc/stackoverflow.png" Margin="0,0,-25,0">
                            <Image.Effect>
                                <DropShadowEffect ShadowDepth="0"/>
                            </Image.Effect>
                            <VisualStateManager.VisualStateGroups>
                                <VisualStateGroup x:Name="CommonStates">
                                    <VisualStateGroup.Transitions>
                                        <VisualTransition GeneratedDuration="0:0:0.5"/>
                                    </VisualStateGroup.Transitions>
                                    <VisualState x:Name="Normal"/>
                                    <VisualState x:Name="MouseOver">
                                        <Storyboard>
                                            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Effect).(DropShadowEffect.ShadowDepth)" Storyboard.TargetName="image">
                                                <EasingDoubleKeyFrame KeyTime="0" Value="15"/>
                                            </DoubleAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Pressed"/>
                                    <VisualState x:Name="Disabled"/>
                                </VisualStateGroup>
                            </VisualStateManager.VisualStateGroups>
                        </Image>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Grid.Resources>
    <Button Style="{StaticResource ButtonStyle1}"/>
</Grid>

请注意,Blend 会为您完成所有这些工作,但了解 XAML 会有所帮助。这是面向 Blend 的教程:

Since you are using Blend, you should take advantage of Blend's support for the VisualStateManager. All you have to do is describe what the object looks like in its various states, like MouseOver and Normal and how long the transitions between various states are, and the visual state manager works out how to transition between states.

An image doesn't have any visual states but you can edit a Button template and make its content an image and then edit the states for the button. I've done this and cleaned up the XAML to demonstrate the technique:

<Grid>
    <Grid.Resources>
        <Style x:Key="ButtonStyle1" TargetType="{x:Type Button}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">
                        <Image x:Name="image" Height="100" Width="Auto" Source="http://thecybershadow.net/misc/stackoverflow.png" Margin="0,0,-25,0">
                            <Image.Effect>
                                <DropShadowEffect ShadowDepth="0"/>
                            </Image.Effect>
                            <VisualStateManager.VisualStateGroups>
                                <VisualStateGroup x:Name="CommonStates">
                                    <VisualStateGroup.Transitions>
                                        <VisualTransition GeneratedDuration="0:0:0.5"/>
                                    </VisualStateGroup.Transitions>
                                    <VisualState x:Name="Normal"/>
                                    <VisualState x:Name="MouseOver">
                                        <Storyboard>
                                            <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Effect).(DropShadowEffect.ShadowDepth)" Storyboard.TargetName="image">
                                                <EasingDoubleKeyFrame KeyTime="0" Value="15"/>
                                            </DoubleAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Pressed"/>
                                    <VisualState x:Name="Disabled"/>
                                </VisualStateGroup>
                            </VisualStateManager.VisualStateGroups>
                        </Image>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Grid.Resources>
    <Button Style="{StaticResource ButtonStyle1}"/>
</Grid>

Note that Blend does all this for you but understanding the XAML will help. Here's a Blend-oriented tutorial:

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