如何在 WPF 中更改 TextBox 的禁用背景颜色

How to change disabled background color of TextBox in WPF

提问by Code-an the Barbarian

I've seen the following thread which is related to my question:

我已经看到以下与我的问题相关的线程：

WPF ComboBox: background color when disabled

WPF ComboBox：禁用时的背景颜色

The above deals with changing the Content Template for a ComboBox. I am working with WPF, am somewhat new to Styles and Templates, and I want to change the dull gray background color of a disabled TextBoxto some other color. We use TextBoxesfrequently in our application and we find the default color settings difficult to read.

以上涉及更改ComboBox. 我正在使用 WPF，对样式和模板有点陌生，我想将残疾人的暗灰色背景颜色更改为TextBox其他颜色。我们TextBoxes在我们的应用程序中经常使用，我们发现默认颜色设置难以阅读。

I've crafted the following solution attempt. But of course, it does not work. Can someone give me an opinion on why?

我精心设计了以下解决方案尝试。但当然，它不起作用。有人可以就原因给我意见吗？

回答by ASanch

Unfortunately for the TextBox control, it appears like it's not as simple as just adding a trigger and changing the Background color when the trigger condition is true. You have to override the entire ControlTemplate to achieve this. Below is one example on how you might do this:

不幸的是，对于 TextBox 控件，它似乎不像添加触发器并在触发器条件为真时更改背景颜色那么简单。您必须覆盖整个 ControlTemplate 才能实现此目的。下面是一个关于如何执行此操作的示例：

<Window x:Class="StackOverflow.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">

    <Window.Resources>
        <SolidColorBrush x:Key="DisabledForegroundBrush" Color="Red" />
        <SolidColorBrush x:Key="DisabledBackgroundBrush" Color="White" />
        <Style TargetType="TextBox">
            <Setter Property="Background" Value="White"/>
            <Setter Property="BorderBrush" Value="Black"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="TextBox">
                        <Border Name="Bd" BorderThickness="{TemplateBinding BorderThickness}" 
                                             BorderBrush="{TemplateBinding BorderBrush}" 
                                             Background="{TemplateBinding Background}" 
                                             SnapsToDevicePixels="true">
                            <ScrollViewer Name="PART_ContentHost" Background="{TemplateBinding Background}" 
                                          SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsEnabled" Value="False">
                                <Setter Value="{StaticResource DisabledBackgroundBrush}" Property="Background" />
                                <Setter Value="{StaticResource DisabledForegroundBrush}" Property="Foreground" />
                                <Setter TargetName="PART_ContentHost" Property="Background" Value="Blue"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>


    </Window.Resources>

    <Canvas>
        <TextBox Text="TextBox" IsEnabled="False"/>
        <TextBox Text="TextBox" IsEnabled="True" Canvas.Top="25"/>
    </Canvas>            
</Window>     

EDIT:

编辑：

In response to your question, I tried adding the ComboBox style to my original answer above and I was able to integrate it without errors. I'm not sure though if it behaves like you wanted it to. I just copy-pasted what's in the link you specified.

针对您的问题，我尝试将 ComboBox 样式添加到我上面的原始答案中，并且能够将其集成而不会出错。我不确定它是否表现得像你想要的那样。我只是复制粘贴了您指定的链接中的内容。

<Window x:Class="StackOverflow.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:StackOverflow"
        Title="MainWindow" Height="350" Width="525"
        x:Name="window">
    <Window.Resources>
        <SolidColorBrush x:Key="DisabledForegroundBrush" Color="Red" />
        <SolidColorBrush x:Key="DisabledBackgroundBrush" Color="Blue" />

        <LinearGradientBrush x:Key="NormalBrush" StartPoint="0,0" EndPoint="0,1">
            <GradientBrush.GradientStops>
                <GradientStopCollection>
                    <GradientStop Color="#FFF" Offset="0.0"/>
                    <GradientStop Color="#CCC" Offset="1.0"/>
                </GradientStopCollection>
            </GradientBrush.GradientStops>
        </LinearGradientBrush>

        <LinearGradientBrush x:Key="HorizontalNormalBrush" StartPoint="0,0" EndPoint="1,0">
            <GradientBrush.GradientStops>
                <GradientStopCollection>
                    <GradientStop Color="#FFF" Offset="0.0"/>
                    <GradientStop Color="#CCC" Offset="1.0"/>
                </GradientStopCollection>
            </GradientBrush.GradientStops>
        </LinearGradientBrush>

        <LinearGradientBrush x:Key="LightBrush" StartPoint="0,0" EndPoint="0,1">
            <GradientBrush.GradientStops>
                <GradientStopCollection>
                    <GradientStop Color="#FFF" Offset="0.0"/>
                    <GradientStop Color="#EEE" Offset="1.0"/>
                </GradientStopCollection>
            </GradientBrush.GradientStops>
        </LinearGradientBrush>

        <LinearGradientBrush x:Key="HorizontalLightBrush" StartPoint="0,0" EndPoint="1,0">
            <GradientBrush.GradientStops>
                <GradientStopCollection>
                    <GradientStop Color="#FFF" Offset="0.0"/>
                    <GradientStop Color="#EEE" Offset="1.0"/>
                </GradientStopCollection>
            </GradientBrush.GradientStops>
        </LinearGradientBrush>

        <LinearGradientBrush x:Key="DarkBrush" StartPoint="0,0" EndPoint="0,1">
            <GradientBrush.GradientStops>
                <GradientStopCollection>
                    <GradientStop Color="#FFF" Offset="0.0"/>
                    <GradientStop Color="#AAA" Offset="1.0"/>
                </GradientStopCollection>
            </GradientBrush.GradientStops>
        </LinearGradientBrush>

        <LinearGradientBrush x:Key="PressedBrush" StartPoint="0,0" EndPoint="0,1">
            <GradientBrush.GradientStops>
                <GradientStopCollection>
                    <GradientStop Color="#BBB" Offset="0.0"/>
                    <GradientStop Color="#EEE" Offset="0.1"/>
                    <GradientStop Color="#EEE" Offset="0.9"/>
                    <GradientStop Color="#FFF" Offset="1.0"/>
                </GradientStopCollection>
            </GradientBrush.GradientStops>
        </LinearGradientBrush>

        <SolidColorBrush x:Key="WindowBackgroundBrush" Color="#FFF" />

        <SolidColorBrush x:Key="SelectedBackgroundBrush" Color="#DDD" />

        <!-- Border Brushes -->

        <LinearGradientBrush x:Key="NormalBorderBrush" StartPoint="0,0" EndPoint="0,1">
            <GradientBrush.GradientStops>
                <GradientStopCollection>
                    <GradientStop Color="#CCC" Offset="0.0"/>
                    <GradientStop Color="#444" Offset="1.0"/>
                </GradientStopCollection>
            </GradientBrush.GradientStops>
        </LinearGradientBrush>

        <LinearGradientBrush x:Key="HorizontalNormalBorderBrush" StartPoint="0,0" EndPoint="1,0">
            <GradientBrush.GradientStops>
                <GradientStopCollection>
                    <GradientStop Color="#CCC" Offset="0.0"/>
                    <GradientStop Color="#444" Offset="1.0"/>
                </GradientStopCollection>
            </GradientBrush.GradientStops>
        </LinearGradientBrush>

        <LinearGradientBrush x:Key="DefaultedBorderBrush" StartPoint="0,0" EndPoint="0,1">
            <GradientBrush.GradientStops>
                <GradientStopCollection>
                    <GradientStop Color="#777" Offset="0.0"/>
                    <GradientStop Color="#000" Offset="1.0"/>
                </GradientStopCollection>
            </GradientBrush.GradientStops>
        </LinearGradientBrush>

        <LinearGradientBrush x:Key="PressedBorderBrush" StartPoint="0,0" EndPoint="0,1">
            <GradientBrush.GradientStops>
                <GradientStopCollection>
                    <GradientStop Color="#444" Offset="0.0"/>
                    <GradientStop Color="#888" Offset="1.0"/>
                </GradientStopCollection>
            </GradientBrush.GradientStops>
        </LinearGradientBrush>

        <SolidColorBrush x:Key="DisabledBorderBrush" Color="#AAA" />

        <SolidColorBrush x:Key="SolidBorderBrush" Color="#888" />

        <SolidColorBrush x:Key="LightBorderBrush" Color="#AAA" />

        <!-- Miscellaneous Brushes -->
        <SolidColorBrush x:Key="GlyphBrush" Color="#444" />

        <SolidColorBrush x:Key="LightColorBrush" Color="#DDD" />

        <ControlTemplate x:Key="ComboBoxToggleButton" TargetType="ToggleButton">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition />
                    <ColumnDefinition Width="20" />
                </Grid.ColumnDefinitions>
                <Border
      x:Name="Border" 
      Grid.ColumnSpan="2"
      CornerRadius="2"
      Background="{StaticResource NormalBrush}"
      BorderBrush="{StaticResource NormalBorderBrush}"
      BorderThickness="1" />
                <Border 
      Grid.Column="0"
      CornerRadius="2,0,0,2" 
      Margin="1" 
      Background="{StaticResource WindowBackgroundBrush}" 
      BorderBrush="{StaticResource NormalBorderBrush}"
      BorderThickness="0,0,1,0" />
                <Path 
      x:Name="Arrow"
      Grid.Column="1"     
      Fill="{StaticResource GlyphBrush}"
      HorizontalAlignment="Center"
      VerticalAlignment="Center"
      Data="M 0 0 L 4 4 L 8 0 Z"/>
            </Grid>
            <ControlTemplate.Triggers>
                <Trigger Property="ToggleButton.IsMouseOver" Value="true">
                    <Setter TargetName="Border" Property="Background" Value="{StaticResource DarkBrush}" />
                </Trigger>
                <Trigger Property="ToggleButton.IsChecked" Value="true">
                    <Setter TargetName="Border" Property="Background" Value="{StaticResource PressedBrush}" />
                </Trigger>
                <Trigger Property="IsEnabled" Value="False">
                    <Setter TargetName="Border" Property="Background" Value="{StaticResource DisabledBackgroundBrush}" />
                    <Setter TargetName="Border" Property="BorderBrush" Value="{StaticResource DisabledBorderBrush}" />
                    <Setter Property="Foreground" Value="{StaticResource DisabledForegroundBrush}"/>
                    <Setter TargetName="Arrow" Property="Fill" Value="{StaticResource DisabledForegroundBrush}" />
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>

        <ControlTemplate x:Key="ComboBoxTextBox" TargetType="TextBox">
            <Border x:Name="PART_ContentHost" Focusable="False" Background="{TemplateBinding Background}" />
        </ControlTemplate>

        <Style x:Key="{x:Type ComboBox}" TargetType="ComboBox">
            <Setter Property="SnapsToDevicePixels" Value="true"/>
            <Setter Property="OverridesDefaultStyle" Value="true"/>
            <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
            <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
            <Setter Property="ScrollViewer.CanContentScroll" Value="true"/>
            <Setter Property="MinWidth" Value="120"/>
            <Setter Property="MinHeight" Value="20"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="ComboBox">
                        <Grid>
                            <ToggleButton 
            Name="ToggleButton" 
            Template="{StaticResource ComboBoxToggleButton}" 
            Grid.Column="2" 
            Focusable="false"
            IsChecked="{Binding Path=IsDropDownOpen,Mode=TwoWay,RelativeSource={RelativeSource TemplatedParent}}"
            ClickMode="Press">
                            </ToggleButton>
                            <ContentPresenter
            Name="ContentSite"
            IsHitTestVisible="False" 
            Content="{TemplateBinding SelectionBoxItem}"
            ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}"
            ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}"
            Margin="3,3,23,3"
            VerticalAlignment="Center"
            HorizontalAlignment="Left" />
                            <TextBox x:Name="PART_EditableTextBox"
            Style="{x:Null}" 
            Template="{StaticResource ComboBoxTextBox}" 
            HorizontalAlignment="Left" 
            VerticalAlignment="Center" 
            Margin="3,3,23,3"
            Focusable="True" 
            Background="Transparent"
            Visibility="Hidden"
            IsReadOnly="{TemplateBinding IsReadOnly}"/>
                            <Popup 
            Name="Popup"
            Placement="Bottom"
            IsOpen="{TemplateBinding IsDropDownOpen}"
            AllowsTransparency="True" 
            Focusable="False"
            PopupAnimation="Slide">
                                <Grid 
              Name="DropDown"
              SnapsToDevicePixels="True"                
              MinWidth="{TemplateBinding ActualWidth}"
              MaxHeight="{TemplateBinding MaxDropDownHeight}">
                                    <Border 
                x:Name="DropDownBorder"
                Background="{StaticResource WindowBackgroundBrush}"
                BorderThickness="1"
                BorderBrush="{StaticResource SolidBorderBrush}"/>
                                    <ScrollViewer Margin="4,6,4,6" SnapsToDevicePixels="True">
                                        <StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained" />
                                    </ScrollViewer>
                                </Grid>
                            </Popup>
                        </Grid>
                        <ControlTemplate.Triggers>
                            <Trigger Property="HasItems" Value="false">
                                <Setter TargetName="DropDownBorder" Property="MinHeight" Value="95"/>
                            </Trigger>
                            <Trigger Property="IsEnabled" Value="false">
                                <Setter Property="Foreground" Value="{StaticResource DisabledForegroundBrush}"/>
                            </Trigger>
                            <Trigger Property="IsGrouping" Value="true">
                                <Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
                            </Trigger>
                            <Trigger SourceName="Popup" Property="Popup.AllowsTransparency" Value="true">
                                <Setter TargetName="DropDownBorder" Property="CornerRadius" Value="4"/>
                                <Setter TargetName="DropDownBorder" Property="Margin" Value="0,2,0,0"/>
                            </Trigger>
                            <Trigger Property="IsEditable"
               Value="true">
                                <Setter Property="IsTabStop" Value="false"/>
                                <Setter TargetName="PART_EditableTextBox" Property="Visibility"    Value="Visible"/>
                                <Setter TargetName="ContentSite" Property="Visibility" Value="Hidden"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <Style.Triggers>
            </Style.Triggers>
        </Style>

        <Style TargetType="TextBox">
            <Setter Property="Background" Value="White"/>
            <Setter Property="BorderBrush" Value="Black"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="TextBox">
                        <Border Name="Bd" BorderThickness="{TemplateBinding BorderThickness}" 
                                             BorderBrush="{TemplateBinding BorderBrush}" 
                                             Background="{TemplateBinding Background}" 
                                             SnapsToDevicePixels="true">
                            <ScrollViewer Name="PART_ContentHost" Background="{TemplateBinding Background}" 
                                          SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsEnabled" Value="False">
                                <Setter Value="{StaticResource DisabledBackgroundBrush}" Property="Background" />
                                <Setter Value="{StaticResource DisabledForegroundBrush}" Property="Foreground" />
                                <Setter TargetName="PART_ContentHost" Property="Background" Value="{StaticResource DisabledBackgroundBrush}"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Window.Resources>

    <StackPanel>
        <TextBox IsEnabled="False">TextBox</TextBox>
        <ComboBox IsEnabled="False"/>
    </StackPanel>
</Window>

回答by Hitesh Patil

You can use the below snippet :

您可以使用以下代码段：

Instead of checking for IsEnable property, use IsReadonly property of TextBox control.

使用 TextBox 控件的 IsReadonly 属性，而不是检查 IsEnable 属性。

<Style TargetType="{x:Type TextBox}">
    <Setter Property="Background" Value="LightSkyBlue" />
    <Style.Triggers>
        <Trigger Property="IsReadOnly" Value="True">
            <Setter Property="Background" Value="Red" />
        </Trigger>
    </Style.Triggers>
</Style>

If You need to apply it for all the textbox controls, use the above code. For specific textbox, just set the key and apply the style to that Textbox.

如果您需要将其应用于所有文本框控件，请使用上面的代码。对于特定的文本框，只需设置键并将样式应用于该文本框。

回答by Steve Westbrook

For this situation I like to set Focusable=falseand set the background color to my desired value (in a data-bound trigger). This is maybe a little hacky, but so is rewriting the control template for the whole TextBox. An alternative to Focusableis IsReadyOnly, but that doesn't work for as many controls. It does ensure the caret disappears, though.

对于这种情况，我喜欢Focusable=false将背景颜色设置为我想要的值（在数据绑定触发器中）。这可能有点 hacky，但重写整个TextBox. 的替代方法Focusable是IsReadyOnly，但这不适用于尽可能多的控件。不过，它确实确保插入符号消失。

回答by Wonko the Sane

You never use the ControlTemplate you defined. Also, you want a Style, not (necessarily) a ControlTemplate.

您从不使用您定义的 ControlTemplate。此外，您需要一个样式，而不是（必须）一个 ControlTemplate。

I think you want something like the following:

我想你想要这样的东西：

<Canvas.Resources>
        <SolidColorBrush x:Key="DisabledForegroundBrush" Color="Red" />
        <SolidColorBrush x:Key="DisabledBackgroundBrush" Color="White" />
        <Style TargetType="{x:Type TextBox}">
            <Style.Triggers>
                <Trigger Property="IsEnabled" Value="False">
                    <Setter Property="Foreground" Value="{StaticResource DisabledForegroundBrush}" />
                    <Setter Property="Background" Value="{StaticResource DisabledBackgroundBrush}" />
                </Trigger>
            </Style.Triggers>
        </Style>
</Canvas.Resources>

回答by Greg Sansom

Try to avoid redefining control templates where you can. They tend to add a lot of code overhead and can become difficult to maintain over time.

尽量避免重新定义控件模板。它们往往会增加大量代码开销，并且随着时间的推移可能变得难以维护。

I would use the following code in the Loaded event:

我将在 Loaded 事件中使用以下代码：

ClassicBorderDecorator o = VisualTreeHelper.GetChild(this.textBox1, 0) as ClassicBorderDecorator;
if (o != null)
{
    o.Background = new SolidColorBrush(Colors.Transparent);
}

回答by bedo

If you look at the template of the textbox, you will notice that the template has a trigger for the IsEnabled property False, and sets it's border element "Bd" background color to SystemColors.ControlBrushKey.

如果您查看文本框的模板，您会注意到该模板具有 IsEnabled 属性 False 的触发器，并将其边框元素“Bd”背景颜色设置为 SystemColors.ControlBrushKey。

If you override this color in a style, it will achieve what you want to do.

如果您在样式中覆盖此颜色，它将实现您想要做的事情。

<Style TargetType="{x:Type TextBox}">
  <Style.Resources>
    <SolidColorBrush 
       x:Key="{x:Static SystemColors.ControlBrushKey}" 
       Color="{StaticResource MyNewTextBoxBackgroundColor}" />
  </Style.Resources>
</Style>

回答by TarmoPikaro

By adding <Window.Resources> after <Window> and before <Grid> will make your text box behave like normal winforms textbox.

<Window x:Class="..." Height="330" Width="600" Loaded="Window_Loaded" WindowStartupLocation="CenterOwner">

<Window.Resources>
    <Style TargetType="{x:Type TextBox}">
        <Style.Triggers>
            <Trigger Property="IsReadOnly" Value="True">
                <Setter Property="Background" Value="LightGray" />
            </Trigger>
            <Trigger Property="IsReadOnly" Value="False">
                <Setter Property="Background" Value="White" />
            </Trigger>
        </Style.Triggers>
    </Style>
</Window.Resources>

<Grid>

Code taken from following web page:

代码取自以下网页：

wpf: Selecting the Text in TextBox with IsReadOnly = true?

wpf：使用 IsReadOnly = true 选择 TextBox 中的文本？

And style modified to match winforms. (Their appearance is enabled = false, not readonly = true)

并修改样式以匹配winform。（它们的外观启用 = false，而不是只读 = true）

And of course your textbox must have IsReadOnly="True" attribute set.

当然，您的文本框必须设置 IsReadOnly="True" 属性。