如何在可编辑的 ComboBox 中设置 TextBox 的背景颜色? [英] how can i set the background color of the TextBox in an editable ComboBox?

问题描述

显示的图像是我的 wpf 应用程序的一部分.我将它设置为一个可编辑的组合框以允许使用输入.然而，里面的 TextBox 有一个白色的背景，我不太喜欢.我怎样才能将它的颜色更改为不同的颜色?(在这种情况下，我想将其更改为 "#FF2E2E2E".)

The image shown is a part of my wpf application. i set it to be a editable combobox to allow use input. however, the TextBox inside has a white background, which i don't like a lot. how could i change the color of it to a different color?(in this case, i want to change it to "#FF2E2E2E".)

我的 xaml:

<ComboBox Height="23" Background="#FF2E2E2E" Foreground="#FF979797" Grid.Column="1" Margin="107,43,0,0" HorizontalAlignment="Left" Width="133" IsEditable="True" VerticalAlignment="Top" IsEnabled="False">
        <ComboBox.Resources>
            <SolidColorBrush x:Key="{x:Static SystemColors.WindowBrushKey}" Color="#FF232323" />
        </ComboBox.Resources>
    </ComboBox>

更新:

它与其他控件和资源无关.

it has nothing to do with other controls and resources.

推荐答案

很好...终于找到了自己.

fine... finally found out myself.

我们可以通过修改默认模板来改变它:

we can change it by modifying the default template:

<SolidColorBrush x:Key="TextBox.Static.Background" Color="#FF2E2E2E"/>
<ControlTemplate x:Key="ComboBoxEditableTemplate" TargetType="{x:Type ComboBox}">
                        <Grid x:Name="templateRoot" 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}}" PopupAnimation="{DynamicResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}" Placement="Bottom">
                                <Themes:SystemDropShadowChrome x:Name="shadow" Color="Transparent" MaxHeight="{TemplateBinding MaxDropDownHeight}" MinWidth="{Binding ActualWidth, ElementName=templateRoot}">
                                    <Border x:Name="dropDownBorder" BorderBrush="{DynamicResource {x:Static SystemColors.WindowFrameBrushKey}}" BorderThickness="1" Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}">
                                        <ScrollViewer x:Name="DropDownScrollViewer">
                                            <Grid x:Name="grid" RenderOptions.ClearTypeHint="Enabled">
                                                <Canvas x:Name="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>
                                </Themes:SystemDropShadowChrome>
                            </Popup>
                            <ToggleButton x:Name="toggleButton" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.ColumnSpan="2" IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ComboBoxToggleButton}"/>
                            <Border x:Name="border" Background="{StaticResource TextBox.Static.Background}" Margin="{TemplateBinding BorderThickness}">
                                <TextBox x:Name="PART_EditableTextBox" Background="{StaticResource TextBox.Static.Background}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" IsReadOnly="{Binding IsReadOnly, RelativeSource={RelativeSource TemplatedParent}}" Margin="{TemplateBinding Padding}" Style="{StaticResource ComboBoxEditableTextBox}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/>
                            </Border>
                        </Grid>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsEnabled" Value="false">
                                <Setter Property="Opacity" TargetName="border" Value="0.56"/>
                            </Trigger>
                            <Trigger Property="IsKeyboardFocusWithin" Value="true">
                                <Setter Property="Foreground" Value="Black"/>
                            </Trigger>
                            <Trigger Property="HasDropShadow" SourceName="PART_Popup" Value="true">
                                <Setter Property="Margin" TargetName="shadow" Value="0,0,5,5"/>
                                <Setter Property="Color" TargetName="shadow" Value="#71000000"/>
                            </Trigger>
                            <Trigger Property="HasItems" Value="false">
                                <Setter Property="Height" TargetName="dropDownBorder" Value="95"/>
                            </Trigger>
                            <MultiTrigger>
                                <MultiTrigger.Conditions>
                                    <Condition Property="IsGrouping" Value="true"/>
                                    <Condition Property="VirtualizingPanel.IsVirtualizingWhenGrouping" Value="false"/>
                                </MultiTrigger.Conditions>
                                <Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
                            </MultiTrigger>
                            <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>

顺便说一句，我删除了一些不相关的代码.关键是

i delete some irrelevant code btw. the key point is

<SolidColorBrush x:Key="TextBox.Static.Background" Color="#FF2E2E2E"/>

和

                        <Border x:Name="border" Background="{StaticResource TextBox.Static.Background}" Margin="{TemplateBinding BorderThickness}">

我所要做的就是修改底层文本框周围边框的颜色！！！

all i have to do is modify the color of the Border around the textbox underlying!!!

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