TargetName property cannot be set on a Style Sette

问题:

I've spent this past week exploring WPF so it's still very new to me. One of the things I'm working on is simple animations. In this case a bouncing smiley face.

My plan of attack is:

1. Make a smiley face. I've done this.
2. Work out the bouncing animation on a simple object. I've done this.
3. Abstract that animation so it can be used in several places (the elements of the smiley face). I'm stuck here.
4. Apply the abstracted animation style to all the elements of the smiley face.

After step #2 I had the the following working XAML:

<Window x:Class="MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApplication1"
        mc:Ignorable="d"
        Title="Test Window" Height="350" Width="620">
    <Grid>
        <Canvas Margin="0,180,0,0">
            <Ellipse Canvas.Left="10" Canvas.Top="10" Width="100" Height="100" Stroke="Blue" StrokeThickness="4" Fill="Aqua" />
            <Ellipse Canvas.Left="30" Canvas.Top="12" Width="60" Height="30">
                <Ellipse.Fill>
                    <LinearGradientBrush StartPoint="0.45,0" EndPoint="0.5, 0.9">
                        <GradientStop Offset="0.2" Color="DarkMagenta" />
                        <GradientStop Offset="0.7" Color="Transparent" />
                    </LinearGradientBrush>
                </Ellipse.Fill>
            </Ellipse>
            <Ellipse Canvas.Left="33" Canvas.Top="35" Width="20" Height="20" Stroke="Blue" StrokeThickness="3" Fill="White" />
            <Ellipse Canvas.Left="40" Canvas.Top="43" Width="6" Height="5" Fill="Black" />
            <Ellipse Canvas.Left="68" Canvas.Top="35" Width="20" Height="20" Stroke="Blue" StrokeThickness="3" Fill="White" />
            <Ellipse Canvas.Left="75" Canvas.Top="43" Width="6" Height="5" Fill="Black" />
            <Path Name="mouth" Stroke="Blue" StrokeThickness="4" Data="M 35,75 Q 55,90 80,75 " />
        </Canvas>
        <Grid Margin="100,5,0,0" Width="75" Height="300">
            <Canvas>
                <Ellipse Height="40" Width="40" x:Name="theBall" Canvas.Left="16">
                    <Ellipse.Fill>
                        <RadialGradientBrush GradientOrigin="0.75,0.25">
                            <GradientStop Color="Yellow" Offset="0.0" />
                            <GradientStop Color="Red" Offset="1.0" />
                        </RadialGradientBrush>
                    </Ellipse.Fill>
                    <Ellipse.RenderTransform>
                        <TransformGroup>
                            <ScaleTransform x:Name="aniSquash"/>
                            <TranslateTransform x:Name="aniBounce"/>
                        </TransformGroup>
                    </Ellipse.RenderTransform>
                    <Ellipse.Triggers>
                        <EventTrigger RoutedEvent="Loaded">
                            <BeginStoryboard>
                                <Storyboard SpeedRatio="2.0">
                                    <DoubleAnimationUsingKeyFrames Duration="0:0:4.5" Storyboard.TargetName="aniBounce" Storyboard.TargetProperty="Y" RepeatBehavior="Forever">
                                        <LinearDoubleKeyFrame Value="120" KeyTime="0:0:0"/>
                                        <SplineDoubleKeyFrame Value="260" KeyTime="0:0:2.2" KeySpline="0, 0, 0.5, 0"/>
                                        <LinearDoubleKeyFrame Value="260" KeyTime="0:0:2.25"/>
                                        <SplineDoubleKeyFrame Value="120" KeyTime="0:0:4.5" KeySpline="0, 0, 0, 0.5"/>
                                    </DoubleAnimationUsingKeyFrames>
                                    <DoubleAnimationUsingKeyFrames Duration="0:0:4.5" Storyboard.TargetName="aniSquash" Storyboard.TargetProperty="ScaleX" RepeatBehavior="Forever">
                                        <LinearDoubleKeyFrame Value="1" KeyTime="0:0:0"/>
                                        <LinearDoubleKeyFrame Value="1" KeyTime="0:0:2"/>
                                        <LinearDoubleKeyFrame Value="1.3" KeyTime="0:0:2.25"/>
                                        <LinearDoubleKeyFrame Value="1" KeyTime="0:0:2.5"/>
                                    </DoubleAnimationUsingKeyFrames>
                                    <DoubleAnimationUsingKeyFrames Duration="0:0:4.5" Storyboard.TargetName="aniSquash" Storyboard.TargetProperty="ScaleY" RepeatBehavior="Forever">
                                        <LinearDoubleKeyFrame Value="1" KeyTime="0:0:0"/>
                                        <LinearDoubleKeyFrame Value="1" KeyTime="0:0:2"/>
                                        <LinearDoubleKeyFrame Value="0.7" KeyTime="0:0:2.25"/>
                                        <LinearDoubleKeyFrame Value="1" KeyTime="0:0:2.5"/>
                                    </DoubleAnimationUsingKeyFrames>
                                </Storyboard>
                            </BeginStoryboard>
                        </EventTrigger>
                    </Ellipse.Triggers>
                </Ellipse>
                <Rectangle Height="5" Canvas.Left="10" Canvas.Top="285" Width="55" Fill="Black"/>
            </Canvas>
        </Grid>
    </Grid>
</Window>

While altering the above, working, XAML for step #3 I introduced an error I don't really understand. Here is the altered XAML that doesn't work:

<Window x:Class="MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApplication1"
        mc:Ignorable="d"
        Title="Test Window" Height="350" Width="620">
    <Window.Resources>
        <TransformGroup x:Key="aniBounceAndSquash">
            <ScaleTransform x:Name="aniSquash"/>
            <TranslateTransform x:Name="aniBounce"/>
        </TransformGroup>
        <Style x:Key="styleBounceAndSquash" TargetType="FrameworkElement">
            <Setter Property="RenderTransform" Value="{StaticResource aniBounceAndSquash}" />
            <Style.Triggers>
                <EventTrigger RoutedEvent="Loaded">
                    <BeginStoryboard>
                        <Storyboard SpeedRatio="2.0">
                            <DoubleAnimationUsingKeyFrames Duration="0:0:4.5" Storyboard.TargetName="aniBounce" Storyboard.TargetProperty="Y" RepeatBehavior="Forever">
                                <LinearDoubleKeyFrame Value="120" KeyTime="0:0:0"/>
                                <SplineDoubleKeyFrame Value="260" KeyTime="0:0:2.2" KeySpline="0, 0, 0.5, 0"/>
                                <LinearDoubleKeyFrame Value="260" KeyTime="0:0:2.25"/>
                                <SplineDoubleKeyFrame Value="120" KeyTime="0:0:4.5" KeySpline="0, 0, 0, 0.5"/>
                            </DoubleAnimationUsingKeyFrames>
                            <DoubleAnimationUsingKeyFrames Duration="0:0:4.5" Storyboard.TargetName="aniSquash" Storyboard.TargetProperty="ScaleX" RepeatBehavior="Forever">
                                <LinearDoubleKeyFrame Value="1" KeyTime="0:0:0"/>
                                <LinearDoubleKeyFrame Value="1" KeyTime="0:0:2"/>
                                <LinearDoubleKeyFrame Value="1.3" KeyTime="0:0:2.25"/>
                                <LinearDoubleKeyFrame Value="1" KeyTime="0:0:2.5"/>
                            </DoubleAnimationUsingKeyFrames>
                            <DoubleAnimationUsingKeyFrames Duration="0:0:4.5" Storyboard.TargetName="aniSquash" Storyboard.TargetProperty="ScaleY" RepeatBehavior="Forever">
                                <LinearDoubleKeyFrame Value="1" KeyTime="0:0:0"/>
                                <LinearDoubleKeyFrame Value="1" KeyTime="0:0:2"/>
                                <LinearDoubleKeyFrame Value="0.7" KeyTime="0:0:2.25"/>
                                <LinearDoubleKeyFrame Value="1" KeyTime="0:0:2.5"/>
                            </DoubleAnimationUsingKeyFrames>
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
            </Style.Triggers>
        </Style>
    </Window.Resources>
    <Grid>
        <Canvas Margin="0,180,0,0">
            <Ellipse Canvas.Left="10" Canvas.Top="10" Width="100" Height="100" Stroke="Blue" StrokeThickness="4" Fill="Aqua" />
            <Ellipse Canvas.Left="30" Canvas.Top="12" Width="60" Height="30">
                <Ellipse.Fill>
                    <LinearGradientBrush StartPoint="0.45,0" EndPoint="0.5, 0.9">
                        <GradientStop Offset="0.2" Color="DarkMagenta" />
                        <GradientStop Offset="0.7" Color="Transparent" />
                    </LinearGradientBrush>
                </Ellipse.Fill>
            </Ellipse>
            <Ellipse Canvas.Left="33" Canvas.Top="35" Width="20" Height="20" Stroke="Blue" StrokeThickness="3" Fill="White" />
            <Ellipse Canvas.Left="40" Canvas.Top="43" Width="6" Height="5" Fill="Black" />
            <Ellipse Canvas.Left="68" Canvas.Top="35" Width="20" Height="20" Stroke="Blue" StrokeThickness="3" Fill="White" />
            <Ellipse Canvas.Left="75" Canvas.Top="43" Width="6" Height="5" Fill="Black" />
            <Path Name="mouth" Stroke="Blue" StrokeThickness="4" Data="M 35,75 Q 55,90 80,75 " />
        </Canvas>
        <Grid Margin="100,5,0,0" Width="75" Height="300">
            <Canvas>
                <Ellipse Height="40" Width="40" x:Name="theBall" Canvas.Left="16" Style="{StaticResource styleBounceAndSquash}">
                    <Ellipse.Fill>
                        <RadialGradientBrush GradientOrigin="0.75,0.25">
                            <GradientStop Color="Yellow" Offset="0.0" />
                            <GradientStop Color="Red" Offset="1.0" />
                        </RadialGradientBrush>
                    </Ellipse.Fill>
                </Ellipse>
                <Rectangle Height="5" Canvas.Left="10" Canvas.Top="285" Width="55" Fill="Black"/>
            </Canvas>
        </Grid>
    </Grid>
</Window>

The error "TargetName property cannot be set on a Style Setter. Line 20 Position 79."

If I can't set it in the style how do I set it?

回答1:

Well it turns out that you can't set Storyboard.TargetName in a Style.Setter because it's a style and is abstracted. Hence a reference via name is not allowed as "there is no spoon". So I dropped Storyboard.TargetName and looked for another way.

I did find that in Storyboard.TargetProperty you can use the object structure, sort of like walking the DOM, to reference the object you want. In that way you bypass the need for Storyboard.TargetName. It took longer to work out referencing the object by structure because I was using a TransformGroup and MS docs are not the most friendly of docs. Finally, I got it and here it is for anyone else that has the same problem.

<Style x:Key="buttonSmiley" TargetType="{x:Type Button}">
    <Style.Resources>
        <Storyboard x:Key="OnVisibleStoryboard">
            <DoubleAnimationUsingKeyFrames Duration="0:0:2.75" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[0].(TranslateTransform.Y)" >
                <LinearDoubleKeyFrame Value="75" KeyTime="0:0:0"/>
                <SplineDoubleKeyFrame Value="25" KeyTime="0:0:0.75" KeySpline="0, 0, 0.5, 0"/>
                <LinearDoubleKeyFrame Value="-25" KeyTime="0:0:1.2"/>
                <SplineDoubleKeyFrame Value="200" KeyTime="0:0:2.25" KeySpline="0, 0, 0, 0.5"/>
                <LinearDoubleKeyFrame Value="175" KeyTime="0:0:2.4" />
                <SplineDoubleKeyFrame Value="150" KeyTime="0:0:2.75" KeySpline="0, 0, 0, 0.5"/>
            </DoubleAnimationUsingKeyFrames>
            <DoubleAnimationUsingKeyFrames Duration="0:0:5.5" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[1].(ScaleTransform.ScaleX)" >
                <LinearDoubleKeyFrame Value="0.01" KeyTime="0:0:0"/>
                <LinearDoubleKeyFrame Value="1" KeyTime="0:0:1.25"/>
                <LinearDoubleKeyFrame Value="1" KeyTime="0:0:2.05"/>
                <LinearDoubleKeyFrame Value="1.15" KeyTime="0:0:2.15"/>
                <LinearDoubleKeyFrame Value="1" KeyTime="0:0:2.4"/>
                <LinearDoubleKeyFrame Value="1" KeyTime="0:0:2.75"/>
            </DoubleAnimationUsingKeyFrames>
            <DoubleAnimationUsingKeyFrames Duration="0:0:5.5" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[1].(ScaleTransform.ScaleY)" >
                <LinearDoubleKeyFrame Value="0.01" KeyTime="0:0:0"/>
                <LinearDoubleKeyFrame Value="1" KeyTime="0:0:1.25"/>
                <LinearDoubleKeyFrame Value="1" KeyTime="0:0:2.05"/>
                <LinearDoubleKeyFrame Value="0.75" KeyTime="0:0:2.2"/>
                <LinearDoubleKeyFrame Value="1" KeyTime="0:0:2.4"/>
                <LinearDoubleKeyFrame Value="1" KeyTime="0:0:2.75"/>
            </DoubleAnimationUsingKeyFrames>
        </Storyboard>
    </Style.Resources>
    <Style.Triggers>
        <Trigger Property="Visibility" Value="Visible">
            <Trigger.EnterActions>
                <RemoveStoryboard BeginStoryboardName="OnLoadStoryboard_BeginStoryboard"/>
                <BeginStoryboard x:Name="OnVisibleStoryboard_BeginStoryboard" Storyboard="{StaticResource OnVisibleStoryboard}"/>
            </Trigger.EnterActions>
        </Trigger>
        <EventTrigger RoutedEvent="Button.Loaded">
            <RemoveStoryboard BeginStoryboardName="OnVisibleStoryboard_BeginStoryboard"/>
            <BeginStoryboard x:Name="OnLoadStoryboard_BeginStoryboard" Storyboard="{StaticResource OnVisibleStoryboard}"/>
        </EventTrigger>
    </Style.Triggers>
    <Setter Property="ContentTemplate">
        <Setter.Value>
            <DataTemplate>
                <Canvas Margin="-35,-35,0,0">
                    <Ellipse Canvas.Left="10" Canvas.Top="10" Width="50" Height="50" Stroke="Blue" StrokeThickness="2" Fill="#FFD8CF15" />
                    <Ellipse Canvas.Left="18" Canvas.Top="12" Width="33" Height="15">
                        <Ellipse.Fill>
                            <LinearGradientBrush StartPoint="0.45,0" EndPoint="0.5, 0.9">
                                <GradientStop Offset="0.2" Color="DarkMagenta" />
                                <GradientStop Offset="0.7" Color="Transparent" />
                            </LinearGradientBrush>
                        </Ellipse.Fill>
                    </Ellipse>
                    <Ellipse Canvas.Left="17" Canvas.Top="25" Width="10" Height="10" Stroke="Blue" StrokeThickness="2" Fill="White" />
                    <Ellipse Canvas.Left="20" Canvas.Top="28" Width="3" Height="3" Fill="Black" />
                    <Ellipse Canvas.Left="34" Canvas.Top="25" Width="10" Height="10" Stroke="Blue" StrokeThickness="2" Fill="White" />
                    <Ellipse Canvas.Left="37" Canvas.Top="28" Width="3" Height="3" Fill="Black" />
                    <Path Name="mouth" Stroke="Blue" StrokeThickness="2" Data="M 20,43 Q 27,53 40,44" />
                </Canvas>
            </DataTemplate>
        </Setter.Value>
    </Setter>
    <Setter Property="RenderTransform">
        <Setter.Value>
            <TransformGroup>
                <TranslateTransform />
                <ScaleTransform />
            </TransformGroup>
        </Setter.Value>
    </Setter>
</Style>

Of course I would have given up on the style altogether if Button.Triggers would have allowed normal triggers and not JUST event triggers in the collection, thank you MS for making life painful, er um I mean fun. Because I needed both I had to work this out.

回答2:

I had this issue because I was building a custom resource (a button).

This was my problem, and its solution:

<Style x:Key="MyButton" TargetType="{x:Type Button}">
    ...
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type Button}">
                ...
                <ControlTemplate.Triggers>
                    ==> should have put triggers here <==
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
    <Style.Triggers>
        ==> not here <==
    </Style.Triggers>
</Style>

回答3:

Here is an example of your animation applied to a Button. Its probably not quite the answer you're looking for as it does not have reusable resources. I have just moved the TransformGroup, Trigger and Storyboard into the control. I will take another look...

<Button Style="{StaticResource styleBounceAndSquash}">
    <Button.RenderTransform>
        <TransformGroup>
            <ScaleTransform x:Name="aniSquash"/>
            <TranslateTransform x:Name="aniBounce"/>
        </TransformGroup>
    </Button.RenderTransform>
    <Button.Triggers>
        <EventTrigger RoutedEvent="Loaded">
            <BeginStoryboard>
                <Storyboard SpeedRatio="2.0">
                    <DoubleAnimationUsingKeyFrames Duration="0:0:4.5" Storyboard.TargetName="aniBounce" Storyboard.TargetProperty="Y" RepeatBehavior="Forever">
                        <LinearDoubleKeyFrame Value="120" KeyTime="0:0:0"/>
                        <SplineDoubleKeyFrame Value="260" KeyTime="0:0:2.2" KeySpline="0, 0, 0.5, 0"/>
                        <LinearDoubleKeyFrame Value="260" KeyTime="0:0:2.25"/>
                        <SplineDoubleKeyFrame Value="120" KeyTime="0:0:4.5" KeySpline="0, 0, 0, 0.5"/>
                    </DoubleAnimationUsingKeyFrames>
                    <DoubleAnimationUsingKeyFrames Duration="0:0:4.5" Storyboard.TargetName="aniSquash" Storyboard.TargetProperty="ScaleX" RepeatBehavior="Forever">
                        <LinearDoubleKeyFrame Value="1" KeyTime="0:0:0"/>
                        <LinearDoubleKeyFrame Value="1" KeyTime="0:0:2"/>
                        <LinearDoubleKeyFrame Value="1.3" KeyTime="0:0:2.25"/>
                        <LinearDoubleKeyFrame Value="1" KeyTime="0:0:2.5"/>
                    </DoubleAnimationUsingKeyFrames>
                    <DoubleAnimationUsingKeyFrames Duration="0:0:4.5" Storyboard.TargetName="aniSquash" Storyboard.TargetProperty="ScaleY" RepeatBehavior="Forever">
                        <LinearDoubleKeyFrame Value="1" KeyTime="0:0:0"/>
                        <LinearDoubleKeyFrame Value="1" KeyTime="0:0:2"/>
                        <LinearDoubleKeyFrame Value="0.7" KeyTime="0:0:2.25"/>
                        <LinearDoubleKeyFrame Value="1" KeyTime="0:0:2.5"/>
                    </DoubleAnimationUsingKeyFrames>
                </Storyboard>
            </BeginStoryboard>
        </EventTrigger>
    </Button.Triggers>
</Button>