WPF 组合框禁用背景颜色
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【中文标题】WPF 组合框禁用背景颜色【英文标题】：WPF combobox disabled background color 【发布时间】：2011-07-26 06:16:00 【问题描述】：当 IsEnabled 设置为 False 时，WPF 组合框的背景颜色似乎不可覆盖。设置 Foreground 属性确实可以正常工作。即使使用 snoop 并设置背景也不会更改禁用状态下的组合框背景颜色。这是我正在使用的样式（基于 Blend 的模板副本）。有什么想法吗？
<!-- COMBO BOX-->
<Style x:Key="ComboBoxFocusVisual">
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate>
<Rectangle Margin="4,4,21,4" SnapsToDevicePixels="true" Stroke="DynamicResource x:Static SystemColors.ControlTextBrushKey" StrokeThickness="1" StrokeDashArray="1 2"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<LinearGradientBrush x:Key="ButtonNormalBackground" EndPoint="0,1" StartPoint="0,0">
<GradientStop Color="#F3F3F3" Offset="0"/>
<GradientStop Color="#EBEBEB" Offset="0.5"/>
<GradientStop Color="#DDDDDD" Offset="0.5"/>
<GradientStop Color="#CDCDCD" Offset="1"/>
</LinearGradientBrush>
<SolidColorBrush x:Key="ButtonNormalBorder" Color="#FF707070"/>
<Geometry x:Key="DownArrowGeometry">M 0 0 L 3.5 4 L 7 0 Z</Geometry>
<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="Template">
<Setter.Value>
<ControlTemplate TargetType="x:Type ToggleButton">
<Microsoft_Windows_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>
</Microsoft_Windows_Themes:ButtonChrome>
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="true">
<Setter Property="RenderPressed" TargetName="Chrome" Value="true"/>
</Trigger>
<!-- This controls the down arrow in the disabled state-->
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Visibility" TargetName="Arrow" Value="Collapsed"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<LinearGradientBrush x:Key="TextBoxBorder" EndPoint="0,20" MappingMode="Absolute" StartPoint="0,0">
<GradientStop Color="#ABADB3" Offset="0.05"/>
<GradientStop Color="#E2E3EA" Offset="0.07"/>
<GradientStop Color="#E3E9EF" Offset="1"/>
</LinearGradientBrush>
<Style x:Key="ComboBoxEditableTextBox" TargetType="x:Type TextBox">
<Setter Property="OverridesDefaultStyle" Value="true"/>
<Setter Property="AllowDrop" Value="true"/>
<Setter Property="MinWidth" Value="0"/>
<Setter Property="MinHeight" Value="0"/>
<Setter Property="FocusVisualStyle" Value="x:Null"/>
<Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst"/>
<Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="x:Type TextBox">
<ScrollViewer x:Name="PART_ContentHost" Background="Transparent" Focusable="false" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<Style x:Key="ComboBoxToggleButton" 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="Template">
<Setter.Value>
<ControlTemplate TargetType="x:Type ToggleButton">
<Microsoft_Windows_Themes:ButtonChrome x:Name="Chrome" BorderBrush="TemplateBinding BorderBrush" Background="TemplateBinding Background" RenderMouseOver="TemplateBinding IsMouseOver" RenderPressed="TemplateBinding IsPressed" RoundCorners="false" SnapsToDevicePixels="true" Width="DynamicResource x:Static SystemParameters.VerticalScrollBarWidthKey">
<Path x:Name="Arrow" Data="StaticResource DownArrowGeometry" Fill="Black" HorizontalAlignment="Center" Margin="0,1,0,0" VerticalAlignment="Center"/>
</Microsoft_Windows_Themes:ButtonChrome>
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="true">
<Setter Property="RenderPressed" TargetName="Chrome" Value="true"/>
</Trigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Fill" TargetName="Arrow" Value="#AFAFAF"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<ControlTemplate x:Key="ComboBoxEditableTemplate" TargetType="x:Type ComboBox">
<Grid x:Name="Placement" SnapsToDevicePixels="true">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<Popup x:Name="PART_Popup" AllowsTransparency="true" Grid.ColumnSpan="2" IsOpen="Binding IsDropDownOpen, RelativeSource=RelativeSource TemplatedParent" PopupAnimation="DynamicResource x:Static SystemParameters.ComboBoxPopupAnimationKey" Placement="Bottom">
<Microsoft_Windows_Themes:SystemDropShadowChrome x:Name="Shdw" Color="Transparent" MaxHeight="TemplateBinding MaxDropDownHeight" MinWidth="Binding ActualWidth, ElementName=Placement">
<Border x:Name="DropDownBorder" BorderBrush="DynamicResource x:Static SystemColors.WindowFrameBrushKey" BorderThickness="1" Background="DynamicResource x:Static SystemColors.WindowBrushKey">
<ScrollViewer x:Name="DropDownScrollViewer">
<Grid RenderOptions.ClearTypeHint="Enabled">
<Canvas HorizontalAlignment="Left" Height="0" VerticalAlignment="Top" Width="0">
<Rectangle x:Name="OpaqueRect" Fill="Binding Background, ElementName=DropDownBorder" Height="Binding ActualHeight, ElementName=DropDownBorder" Width="Binding ActualWidth, ElementName=DropDownBorder"/>
</Canvas>
<ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Contained" SnapsToDevicePixels="TemplateBinding SnapsToDevicePixels"/>
</Grid>
</ScrollViewer>
</Border>
</Microsoft_Windows_Themes:SystemDropShadowChrome>
</Popup>
<Microsoft_Windows_Themes:ListBoxChrome x:Name="Border" BorderBrush="TemplateBinding BorderBrush" BorderThickness="TemplateBinding BorderThickness" Background="TemplateBinding Background" Grid.ColumnSpan="2" RenderMouseOver="TemplateBinding IsMouseOver" RenderFocused="TemplateBinding IsKeyboardFocusWithin"/>
<TextBox x:Name="PART_EditableTextBox" HorizontalContentAlignment="TemplateBinding HorizontalContentAlignment" IsReadOnly="Binding IsReadOnly, RelativeSource=RelativeSource TemplatedParent" Margin="TemplateBinding Padding" Style="StaticResource ComboBoxEditableTextBox" VerticalContentAlignment="TemplateBinding VerticalContentAlignment"/>
<ToggleButton Grid.Column="1" IsChecked="Binding IsDropDownOpen, Mode=TwoWay, RelativeSource=RelativeSource TemplatedParent" Style="StaticResource ComboBoxToggleButton"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsKeyboardFocusWithin" Value="true">
<Setter Property="Foreground" Value="Black"/>
</Trigger>
<Trigger Property="IsDropDownOpen" Value="true">
<Setter Property="RenderFocused" TargetName="Border" Value="true"/>
</Trigger>
<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>
<Trigger Property="HasDropShadow" SourceName="PART_Popup" Value="true">
<Setter Property="Margin" TargetName="Shdw" Value="0,0,5,5"/>
<Setter Property="Color" TargetName="Shdw" Value="#71000000"/>
</Trigger>
<Trigger Property="ScrollViewer.CanContentScroll" SourceName="DropDownScrollViewer" Value="false">
<Setter Property="Canvas.Top" TargetName="OpaqueRect" Value="Binding VerticalOffset, ElementName=DropDownScrollViewer"/>
<Setter Property="Canvas.Left" TargetName="OpaqueRect" Value="Binding HorizontalOffset, ElementName=DropDownScrollViewer"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
<Style x:Key="ComboBoxStyle1" TargetType="x:Type ComboBox">
<Setter Property="FocusVisualStyle" Value="StaticResource ComboBoxFocusVisual"/>
<Setter Property="Foreground" Value="DynamicResource x:Static SystemColors.WindowTextBrushKey"/>
<Setter Property="Background" Value="StaticResource ButtonNormalBackground"/>
<Setter Property="BorderBrush" Value="StaticResource ButtonNormalBorder"/>
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
<Setter Property="Padding" Value="4,3"/>
<Setter Property="ScrollViewer.CanContentScroll" Value="true"/>
<Setter Property="ScrollViewer.PanningMode" Value="Both"/>
<Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
<Setter Property="Template">
<Setter.Value>
<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" AllowsTransparency="true" Grid.ColumnSpan="2" IsOpen="Binding IsDropDownOpen, RelativeSource=RelativeSource TemplatedParent" Margin="1" PopupAnimation="DynamicResource x:Static SystemParameters.ComboBoxPopupAnimationKey" Placement="Bottom">
<Microsoft_Windows_Themes:SystemDropShadowChrome x:Name="Shdw" Color="Transparent" MaxHeight="TemplateBinding MaxDropDownHeight" MinWidth="Binding ActualWidth, ElementName=MainGrid">
<Border x:Name="DropDownBorder" BorderBrush="DynamicResource x:Static SystemColors.WindowFrameBrushKey" BorderThickness="1" Background="DynamicResource x:Static SystemColors.WindowBrushKey">
<ScrollViewer x:Name="DropDownScrollViewer">
<Grid RenderOptions.ClearTypeHint="Enabled">
<Canvas HorizontalAlignment="Left" Height="0" VerticalAlignment="Top" Width="0">
<Rectangle x:Name="OpaqueRect" Fill="Binding Background, ElementName=DropDownBorder" Height="Binding ActualHeight, ElementName=DropDownBorder" Width="Binding ActualWidth, ElementName=DropDownBorder"/>
</Canvas>
<ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Contained" SnapsToDevicePixels="TemplateBinding SnapsToDevicePixels"/>
</Grid>
</ScrollViewer>
</Border>
</Microsoft_Windows_Themes:SystemDropShadowChrome>
</Popup>
<ToggleButton BorderBrush="TemplateBinding BorderBrush" Background="TemplateBinding Background" 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="HasDropShadow" SourceName="PART_Popup" Value="true">
<Setter Property="Margin" TargetName="Shdw" Value="0,0,5,5"/>
<Setter Property="Color" TargetName="Shdw" Value="#71000000"/>
</Trigger>
<Trigger Property="HasItems" Value="false">
<Setter Property="Height" TargetName="DropDownBorder" Value="95"/>
</Trigger>
<Trigger Property="IsEnabled" Value="false">
<!-- Text color for disabled state-->
<Setter Property="Foreground" Value="DynamicResource x:Static SystemColors.WindowTextBrushKey"/>
<!-- Backround not working, something must be overriding it
<Setter Property="Background" Value="DynamicResource x:Static SystemColors.WindowBrushKey"/>
-->
</Trigger>
<Trigger Property="IsGrouping" Value="true">
<Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
</Trigger>
<Trigger Property="ScrollViewer.CanContentScroll" SourceName="DropDownScrollViewer" Value="false">
<Setter Property="Canvas.Top" TargetName="OpaqueRect" Value="Binding VerticalOffset, ElementName=DropDownScrollViewer"/>
<Setter Property="Canvas.Left" TargetName="OpaqueRect" Value="Binding HorizontalOffset, ElementName=DropDownScrollViewer"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsEditable" Value="true">
<Setter Property="BorderBrush" Value="StaticResource TextBoxBorder"/>
<Setter Property="Background" Value="DynamicResource x:Static SystemColors.WindowBrushKey"/>
<Setter Property="IsTabStop" Value="false"/>
<Setter Property="Padding" Value="3"/>
<Setter Property="Template" Value="StaticResource ComboBoxEditableTemplate"/>
</Trigger>
</Style.Triggers>
</Style>
【问题讨论】：
我已在microsoft connect site 上留下反馈，供以后的读者参考 这不是一个完整的答案，但我认为它说明了为什么会发生这种情况：***.com/questions/4424699/…。 ComboBox 在其模板中使用 ToggleButton，而 ToggleButton 又使用 ButtonChrome，这是链接中解决的问题。 【参考方案1】：相关：WPF ComboBox: background color when disabled
【讨论】：
【参考方案2】：取决于“不可覆盖”的含义。模板中的这个触发器：
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="DynamicResource x:Static SystemColors.GrayTextBrushKey"/>
<Setter Property="Background" Value="#FFF4F4F4"/>
</Trigger>
是设置背景。因此，您必须重写模板才能对其进行自定义 - 控件本身没有属性可以用于在禁用时设置背景，并且没有资源查找，因此您也无法在那里更改它。
【讨论】：
我试过改变它，它没有效果。如果您不相信我，请尝试一下。还是我理解错了？ Adam 是对的，如果您在 setter 中更改 Background 值，则没有明显差异。 有几个 IsEnabled 触发器（我可能复制了错误的一个）。你试过正确的吗？ 我都试过了。就像我之前提到的，请随时证明我错了。以上是关于WPF 组合框禁用背景颜色的主要内容，如果未能解决你的问题，请参考以下文章
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