WPF——它比我做的要容易

Question

我有最糟糕的时间来解决这个问题:假设我有两个 Button 和三个 TextBlocks。我希望任何一个按钮都能在所有 TextBlocks 上触发一个简单的 Storyboard。目前我正在尝试定义一个包含 Storyboard 的通用文本 block 样式，然后触发器来自任何按钮单击。这是我最接近的一次，但应用程序在启动时崩溃......我在这里没有错:

<Window.Resources>

<Style TargetType="TextBlock" >
    <Setter Property="Foreground" Value="Blue" />
    <Style.Resources>
        <Storyboard x:Key="TextBlockOpacity" Storyboard.TargetProperty="Opacity">
            <DoubleAnimation From="0" To="1" />
        </Storyboard>
    </Style.Resources>      
</Style>

<Window.Triggers>
    <EventTrigger RoutedEvent="ButtonBase.Click" SourceName="button">
        <BeginStoryboard Storyboard="{StaticResource TextBlockOpacity}"/>
    </EventTrigger>
</Window.Triggers>


<Grid x:Name="LayoutRoot">
    <Button x:Name="button" HorizontalAlignment="Left" Margin="51,54,0,0" VerticalAlignment="Top" Width="96" Height="45" Content="Button"/>

    <TextBlock x:Name="textBlock1" Margin="228,54,172,0" VerticalAlignment="Top" Height="45" FontSize="26.667" Text="TextBlock" TextWrapping="Wrap" />
    <TextBlock x:Name="textBlock2" Margin="228,103,172,0" VerticalAlignment="Top" Height="45" FontSize="26.667" Text="Hello" TextWrapping="Wrap"/>
</Grid>

Answer 1

如果你“专用”按钮来改变不透明度，你可以利用它的DataContext并为其设置动画。然后简单地绑定(bind)你的元素的Opacity到DataContext :

(我还稍微重构了您的 xaml)

<Window x:Class="SomeNamespace.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:System="clr-namespace:System;assembly=mscorlib"
    Title="Window1" Height="300" Width="300">
    <Window.Resources>        
        <Storyboard x:Key="TextBlockOpacity" Storyboard.TargetName="button1" Storyboard.TargetProperty="DataContext" >
            <DoubleAnimation From="0.1" To="1"/>
        </Storyboard>        
        <Style TargetType="TextBlock" >
            <Setter Property="Foreground" Value="Blue" />
            <Setter Property="Background" Value="LightGray" />
            <Setter Property="FontSize" Value="26.667" />
            <Setter Property="TextWrapping" Value="Wrap" />
            <Setter Property="Height" Value="45" />            
            <Setter Property="Opacity" Value="{Binding ElementName=button1, Path=DataContext}"/>
        </Style>
    </Window.Resources>

    <Window.Triggers>
        <EventTrigger RoutedEvent="ButtonBase.Click">
            <BeginStoryboard Storyboard="{StaticResource TextBlockOpacity}" >
            </BeginStoryboard>
        </EventTrigger>

        <EventTrigger RoutedEvent="ListBox.SelectionChanged">
            <BeginStoryboard Storyboard="{StaticResource TextBlockOpacity}" >
            </BeginStoryboard>
        </EventTrigger>
    </Window.Triggers>

    <Grid x:Name="LayoutRoot">
        <Button x:Name="button1" HorizontalAlignment="Left" Margin="51,54,0,0" VerticalAlignment="Top" Width="96" Height="45" Content="Button">
            <Button.DataContext>
                <System:Double>0</System:Double>
            </Button.DataContext>
        </Button>

        <Button x:Name="button2" HorizontalAlignment="Right" Margin="0,54,29,0" VerticalAlignment="Top" Width="96" Height="45" Content="Button"/>

        <ListBox x:Name="listBox1" Height="50" VerticalAlignment="Top">
            <ListBox.Items>
                <System:String>Text1</System:String>
                <System:String>Text2</System:String>
            </ListBox.Items>
        </ListBox>

        <TextBlock x:Name="textBlock1" Margin="51,114,61,0" Text="TextBlock" Height="45" VerticalAlignment="Top" Width="166" />
        <TextBlock x:Name="textBlock2" Margin="51,0,74,42" Text="Hello" Height="45" Width="153" VerticalAlignment="Bottom" />
    </Grid>
</Window>

另请注意一件事 - 如果您想最小化代码并使其全部在 xaml 中发生，则可以使用这种方法。您的方法将使 Opacity 充满活力整个窗口。这就是为什么在上面的代码中，TextBlocks 绑定(bind)到按钮的 DataContext ，它本身是动画的。

不绑定(bind)到一个公共(public)值(DataContext)当然是可行的，但是你需要重复 X 动画(因为你需要设置 X TargetNames)。上面的这种方法更容易扩展和维护。

编辑

添加了另一个 Button 和 ListBox 以供多样化:)