WPF风格：如何改变渐变停止颜色触发

问题描述

我有一个按钮样式：

<Style x:Key="ButtonStyle1" TargetType="{x:Type Button}">
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="{x:Type Button}">
        <Grid>
          <Path x:Name="path1" ... Data="...some data...">
            <Path.Fill>
              <LinearGradientBrush EndPoint="0.5,-0.3" StartPoint="0.5,0.8">
                <GradientStop x:Name="gs1" Color="Green" Offset="0.44"/>
                <GradientStop Color="Black" Offset="0.727"/>
              </LinearGradientBrush>
            </Path.Fill>
          </Path>
        <ContentPresenter ...properties...   />
      </Grid>

     <ControlTemplate.Triggers>
       <Trigger Property="IsMouseOver" Value="True">
         <Setter TargetName="???" Property="Color" Value="Green"></Setter>
       </Trigger>
     </ControlTemplate.Triggers>
   </ControlTemplate>
 </Setter.Value>

 

我想改变渐变停止的颜色为x：名称=GS1，当鼠标移动到按钮，所以我用触发器IsMouseOver。我怎样才能在触发到颜色属性的访问？我试过的TargetName =GS1和的TargetName =path1.gs1，但它不工作。任何想法？

I want to change the Color of GradientStop with x:Name="gs1" when mouse is over button, so I use Trigger IsMouseOver. How can i get an access to Color Property in Trigger? I tried TargetName="gs1" and TargetName="path1.gs1" but it doesn't work. Any idea?

推荐答案

试试这个：

<Style x:Key="ButtonStyle1" TargetType="{x:Type Button}">
        <Style.Resources>
            <LinearGradientBrush x:Key="gs1" EndPoint="0.5,-0.3" StartPoint="0.5,0.8">
                <GradientStop Color="Green" Offset="0.44"/>
                <GradientStop Color="Black" Offset="0.727"/>
            </LinearGradientBrush>
            <LinearGradientBrush x:Key="gs2" EndPoint="0.5,-0.3" StartPoint="0.5,0.8">
                <GradientStop Color="White" Offset="0.44"/>
                <GradientStop Color="Black" Offset="0.727"/>
            </LinearGradientBrush>
        </Style.Resources>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Button}">
                    <Grid>
                        <Path x:Name="path1" ........... Fill="{StaticResource gs1}">
                        </Path>
                        <ContentPresenter  .........../>
                    </Grid>

                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter TargetName="path1" Property="Fill" Value="{StaticResource gs2}"></Setter>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>

        </Setter>
    </Style>

它会为你工作。您可以使用数据绑定也，在code声明一个颜色的DependencyProperty，用渐变停止的色彩属性绑定它，只要你想更新它。

it will work for you. You can use DataBinding also, Declare a Color DependencyProperty in code, Bind it with the GradientStop's Color property and update it whenever you want.

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