Question

为什么这不起作用：

    <Button Width="200" Height="50">
    <Button.Style>
    <Style TargetType="Button">
        <Setter Property="Height" Value="{Binding RelativeSource={RelativeSource Self}, Path=Height}"/>
        <Setter Property="Background" Value="Blue"/>
        <Style.Triggers>
                <Trigger Property="Button.IsPressed" Value="true">
                    <Setter Property="Background" Value="green"/>
                    <Setter Property="Height" Value="20"/>
                </Trigger>
        </Style.Triggers>
    </Style>
    </Button.Style>

<Button.Template>
    <ControlTemplate>
        <Canvas x:Name="MainCanvas" Width="{TemplateBinding Width}" Height="{TemplateBinding Height}">
            <Border 
            Width="{TemplateBinding Width}"  Height="{TemplateBinding Height}"
                      x:Name="Border"  
                      CornerRadius="2" 
                      BorderThickness="1"
                      Background="{TemplateBinding Background}"
                      BorderBrush="black">
               <ContentPresenter 
                 Margin="2"
                 HorizontalAlignment="Center"
                 VerticalAlignment="Center"
                 RecognizesAccessKey="True"/>
             </Border>
        </Canvas>
    </ControlTemplate>
</Button.Template>
Hello
</Button>

像这样：

<Button Width="200" >
<Button.Style>
    <Style TargetType="Button">
        <Setter Property="Height" Value="50"/>
        <Setter Property="Background" Value="Blue"/>
        <Style.Triggers>
                <Trigger Property="Button.IsPressed" Value="true">
                    <Setter Property="Background" Value="green"/>
                    <Setter Property="Height" Value="20"/>
                </Trigger>
        </Style.Triggers>
    </Style>
</Button.Style>
<Button.Template>
    <ControlTemplate>
        <Canvas x:Name="MainCanvas" Width="{TemplateBinding Width}" Height="{TemplateBinding Height}">
            <Border 
            Width="{TemplateBinding Width}"  Height="{TemplateBinding Height}"
                      x:Name="Border"  
                      CornerRadius="2" 
                      BorderThickness="1"
                      Background="{TemplateBinding Background}"
                      BorderBrush="black">
               <ContentPresenter 
                 Margin="2"
                 HorizontalAlignment="Center"
                 VerticalAlignment="Center"
                 RecognizesAccessKey="True"/>
             </Border>
        </Canvas>
    </ControlTemplate>
</Button.Template>
Hello
</Button>

按下按钮时我希望按钮缩小。这是自定义控件的原型，因此Style将在稍后提升到Generics.xmal文件。为什么它不会在Button ???上显示'Hello'字符串

Answer 1

在将TargetType="Button"添加到ControlTemplate标记之前，字符串“Hello”不会显示在按钮上，因为否则ContentPresenter不知道它正在处理的内容：

<ControlTemplate TargetType="Button">

至于你的样式绑定，你要做的是将属性绑定到自身 - 这没有任何意义。你想要实现什么目标？

WPF使用绑定时通过触发器设置值

1 个答案: