边境改变背景颜色的每个系统的颜色改变

Question

WPF组合框弹出模板我这里有我的个性ComboBox：

它实际上是一个浏览器选择。但现在你看到的是使用ComboBox的选择器控制原型。

我遇到的问题是这样的下拉菜单（Popup）控制的背景

背景颜色应动态，一旦用户改变改变自己的主题颜色Color and Apperance设置在Personalization。

这是我的模板背后的故事

我可以用一个简单的Converter改变Background颜色：

public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) 
{ 
    int argbColor = (int)Microsoft.Win32.Registry.GetValue(@"HKEY_CURRENT_USER\Software\Microsoft\Windows\DWM", "ColorizationColor", null); 
    var color = System.Drawing.Color.FromArgb(argbColor); 

    SolidColorBrush scb = new SolidColorBrush(); 

    if (Environment.OSVersion.Version.Major == 6 && Environment.OSVersion.Version.Minor == 1) // Windows 7 
    { 
     //scb = new SolidColorBrush(Color.FromArgb((byte)((int)color.A/3), color.R, color.G, color.B)); 
     scb = new SolidColorBrush(Color.FromArgb(color.A, color.R, color.G, color.B)); 
    } 
    else if (Environment.OSVersion.Version.Major == 6 && Environment.OSVersion.Version.Minor == 2) // Windows 8 
    { 
     scb = new SolidColorBrush(Color.FromArgb(color.A, color.R, color.G, color.B)); 
    } 

    return scb; 
} 

设置它是这样的：

<me:BackgroundConverter x:Key="BgConverter" /> 

和实施它是这样的：

<ControlTemplate TargetType="{x:Type ComboBox}"> 
    <Grid x:Name="MainGrid" SnapsToDevicePixels="true"> 
     <Grid.ColumnDefinitions> 
      <ColumnDefinition Width="*"/> 
      <ColumnDefinition MinWidth="{DynamicResource {x:Static SystemParameters.VerticalScrollBarWidthKey}}" Width="0"/> 
     </Grid.ColumnDefinitions> 
     <Popup x:Name="PART_Popup" Grid.Column="0" AllowsTransparency="true" IsOpen="{Binding IsDropDownOpen, RelativeSource={RelativeSource TemplatedParent}}" Margin="1" PopupAnimation="{DynamicResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}" Placement="Bottom"> 
      <Themes:SystemDropShadowChrome x:Name="Shdw" Color="Transparent"> 
       <Border x:Name="DropDownBorder" 
        BorderBrush="{DynamicResource {x:Static SystemColors.WindowFrameBrushKey}}" 
        BorderThickness="{Binding Converter={StaticResource BorderConverter}}" 
        Background="{Binding Converter={StaticResource BgConverter}}" 
        CornerRadius="0,0,12,12"> 

        <ItemsPresenter x:Name="bn" KeyboardNavigation.DirectionalNavigation="Contained" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" HorizontalAlignment="Center" /> 
       </Border> 
      </Themes:SystemDropShadowChrome> 
     </Popup> 
     <ToggleButton Grid.ColumnSpan="2" IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ComboBoxReadonlyToggleButton}"/> 
     <ContentPresenter ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}" ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" Content="{TemplateBinding SelectionBoxItem}" ContentStringFormat="{TemplateBinding SelectionBoxItemStringFormat}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" IsHitTestVisible="false" Margin="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/> 
    </Grid> 
    <ControlTemplate.Triggers> 
     <Trigger Property="HasItems" Value="false"> 
      <Setter Property="Height" TargetName="DropDownBorder" Value="95"/> 
     </Trigger> 
     <Trigger Property="IsEnabled" Value="false"> 
      <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/> 
      <Setter Property="Background" Value="#FFF4F4F4"/> 
     </Trigger> 
     <Trigger Property="IsGrouping" Value="true"> 
      <Setter Property="ScrollViewer.CanContentScroll" Value="false"/> 
     </Trigger> 
    </ControlTemplate.Triggers> 
</ControlTemplate> 

检查Border x:Name="DropDownBorder"一行。现在，当用户更改主题颜色时，如何使其动态更改？我通过触发尝试：

<Trigger Property="IsDropDownOpen" Value="true"> 
    <!-- not really working --> 
    <Setter Property="Background" TargetName="DropDownBorder" Value="{Binding Converter={StaticResource BgConverter}}"/> 
</Trigger> 

，但它不是由钩住DropDownOpened或DropDownClosed事件和刚刚从那里改变背景颜色工作

我其实有一个非常简单的跛脚的解决方案。该解决方案实际上工作得很好，但可能通过触发器或EventTrigger做到最简单的方法？

- 更新 -

public static class ComboBoxExtension 
{ 
    public static void UpdatePopupBackground(this ComboBox cb) 
    { 
     Border b = (Border)cb.Template.FindName("DropDownBorder", cb); 

     int argbColor = (int)Microsoft.Win32.Registry.GetValue(@"HKEY_CURRENT_USER\Software\Microsoft\Windows\DWM", "ColorizationColor", null); 
     var color = System.Drawing.Color.FromArgb(argbColor); 

     SolidColorBrush scb = new SolidColorBrush(); 

     if (Environment.OSVersion.Version.Major == 6 && Environment.OSVersion.Version.Minor == 1) // Windows 7 
     { 
      //scb = new SolidColorBrush(Color.FromArgb((byte)((int)color.A/3), color.R, color.G, color.B)); 
      scb = new SolidColorBrush(Color.FromArgb(color.A, color.R, color.G, color.B)); 
     } 
     else if (Environment.OSVersion.Version.Major == 6 && Environment.OSVersion.Version.Minor == 2) // Windows 8 
     { 
      scb = new SolidColorBrush(Color.FromArgb(color.A, color.R, color.G, color.B)); 
     } 

     b.Background = scb; 
    } 
} 

，并调用它时，DropDownOpened触发：

ComboMe.UpdatePopupBackground(); 

LOL ...好..

Answer 1

在我看来，第一步为了得到这个特定颜色变化的通知，你需要在MainWindow中挂钩WindowProc（或者一个隐藏的颜色变化检测窗口？）并且观察DWM中的WM_DWMCOLORIZATIONCOLORCHANGED消息。