MouseOver突出显示样式在一秒钟后返回默认值（由Aero引起？）

Question

我试图设计我的ComboBoxes以匹配UI的其余部分，但我遇到了IsMouseOver突出显示的问题。它突出显示我指定的颜色一秒钟，然后淡化回默认颜色，一种很酷的效果，但不是我想要的。这是我的风格：

<Style TargetType="ComboBox">
    <Style.Triggers>
        <Trigger Property="ComboBox.IsMouseOver" Value="True">
            <Setter Property = "Background" Value="Red"/>
        </Trigger>
    </Style.Triggers>
</Style>

如何保持背景颜色？

Answer 1

问题确实是由于ComboBox的默认模板。如果您使用 Reflector 打开PresentationFramework.Aero程序集，您可以查看ButtonChrome类。有一个名为OnRenderMouseOverChanged的方法隐藏了红色背景。

即使它有很多工作，至少对于ComboBox，您可能希望覆盖ComboBox的默认模板。通过使用 Show Me The，您可以了解ComboBox temlpate的基本概念。模板或 Blend 。

您可以使用相同的样式覆盖模板。

<Style TargetType="{x:Type ComboBox}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type ComboBox}">
                <!-- Template Here -->
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

Answer 2

您可以通过从WPF Visual Studio Designer获取默认模板的副本，然后在ComboBoxReadonlyToggleButton样式中注释掉ButtonChrome部分并将其替换为Border来覆盖此行为。这是我找到解决方案的网站的链接 - http://www.scriptscoop.net/t/d346cf01d844/cc-wpf-combobox-mouse-over-color.html

这是我的代码段

<Style x:Key="ComboBoxReadonlyToggleButton" TargetType="{x:Type ToggleButton}">
  <Setter Property="OverridesDefaultStyle" Value="true"/>
  <Setter Property="IsTabStop" Value="false"/>
  <Setter Property="Focusable" Value="false"/>
  <Setter Property="ClickMode" Value="Press"/>
  <Setter Property="Background" Value="Transparent"/>
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="{x:Type ToggleButton}">
        <!-- Replace the ButtonChrome - this eliminated the following
             problem:  When the mouse was moved over the ComboBox
             the color would change to the color defined in ___ but 
             then would  
             immediately change to the default Aero blue
             gradient background of 2 powder blue colors  - 
             Had to comment out the          
             below code and replace it as shown
             <Themes:ButtonChrome x:Name="Chrome" BorderBrush="                 {TemplateBinding BorderBrush}" Background="{TemplateBinding Background}" RenderMouseOver="{TemplateBinding IsMouseOver}" RenderPressed="{TemplateBinding IsPressed}" SnapsToDevicePixels="true">
               <Grid HorizontalAlignment="Right" Width="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}">
                 <Path x:Name="Arrow" Data="{StaticResource DownArrowGeometry}" Fill="Black" HorizontalAlignment="Center" Margin="3,1,0,0" VerticalAlignment="Center"/>
               </Grid>
             </Themes:ButtonChrome>-->

         <!-- Here is the code to replace the ButtonChrome code -->
         <Border x:Name="Chrome" BorderBrush="{TemplateBinding BorderBrush}" Background="{TemplateBinding Background}" SnapsToDevicePixels="true">
           <Grid HorizontalAlignment="Right" Width="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}">
             <Path x:Name="Arrow" Data="{StaticResource DownArrowGeometry}" Fill="Black" HorizontalAlignment="Center" Margin="3,1,0,0" VerticalAlignment="Center"/>
           </Grid>
         </Border>
       <!-- End of code to replace the Button Chrome -->

我还添加了一些代码来将背景颜色更改为DarkOrange - 此代码进入ControlTemplate（在部分中），用于ComboBox的样式。

<!-- Hover Code - Code that was added to change the ComboBox background 
     color when the use hovers over it with the mouse -->
<Trigger Property="IsMouseOver" Value="True">
   <Setter Property="Background" Value="DarkOrange"></Setter>
</Trigger>
<!-- Hover Code - End -->