从同一个点击事件中调用两个不同的动画

Question

I'm currently working on a Surface application where I need to call two different animations when a button is tapped.

How exactly should I be doing this? I'd like to do it declaratively if it's possible. Should I be using MultiTriggers for this, or?

Thanks in advance!

Answer 1

You can do this with an EventTrigger.

You can define the trigger in a FrameworkElement.Triggers property of any container of both the button and the animation targets.

    <StackPanel
        Orientation="Horizontal">

        <StackPanel.Triggers>

            <EventTrigger
                SourceName="TheButton"
                RoutedEvent="Button.Click">

                <BeginStoryboard>
                    <Storyboard>
                        <ColorAnimation
                            Storyboard.TargetName="LimeRect"
                            Storyboard.TargetProperty="Fill.Color"
                            To="Red" />
                        <ColorAnimation
                            Storyboard.TargetName="RedRect"
                            Storyboard.TargetProperty="Fill.Color"
                            To="Lime" />
                    </Storyboard>
                </BeginStoryboard>

            </EventTrigger>

        </StackPanel.Triggers>


        <Button
            x:Name="TheButton"
            Content="Play" />

        <Rectangle
            x:Name="LimeRect"
            Fill="Lime"
            Width="50"
            Height="50" />

        <Rectangle
            x:Name="RedRect"
            Fill="Red"
            Width="50"
            Height="50" />

    </StackPanel>

If there is a relative path to your targets, you can use Storyboard.Target="{Binding PathToTarget}" in place of Storyboard.TargetName="TargetName" .

EDIT: (see comments)

If you are animating the button itself, you can put the triggers right in the button and you don't need any target names.

Example - Animating the size of a ToggleButton:

    <ToggleButton
        Content="Toggle"
        Width="50"
        Height="50">

        <ToggleButton.Triggers>

            <EventTrigger
                RoutedEvent="ToggleButton.Checked">
                <BeginStoryboard>
                    <Storyboard>
                        <DoubleAnimation
                            Duration="00:00:00.2"
                            Storyboard.TargetProperty="Width"
                            To="100" />
                        <DoubleAnimation
                            Duration="00:00:00.2"
                            Storyboard.TargetProperty="Height"
                            To="100" />
                    </Storyboard>
                </BeginStoryboard>
            </EventTrigger>

            <EventTrigger
                RoutedEvent="ToggleButton.Unchecked">
                <BeginStoryboard>
                    <Storyboard>
                        <DoubleAnimation
                            Duration="00:00:00.2"
                            Storyboard.TargetProperty="Width"
                            To="50" />
                        <DoubleAnimation
                            Duration="00:00:00.2"
                            Storyboard.TargetProperty="Height"
                            To="50" />
                    </Storyboard>
                </BeginStoryboard>
            </EventTrigger>

        </ToggleButton.Triggers>

    </ToggleButton>