WPF ListBoxItem：按样式覆盖 SystemColors 无效

Question

我想覆盖 ListBoxItem 的 SystemColors。我的目标是更改 选中但未聚焦的 项目的背景。默认情况下，当失去焦点时它是灰色的，例如。通过显示上下文菜单。我不想要花哨的复杂样式糖代码，只是一些非常简单的东西。我在网上发现了几个关于覆盖 SystemColors 的线程，但没有一个有效。

下面的copy-paste-code不起作用，刷机会被忽略，没有效果

<Window x:Class="WpfAppListBoxItemBrushes.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:sys="clr-namespace:System;assembly=mscorlib"
    mc:Ignorable="d"
    Title="MainWindow" Height="200" Width="400">
<ListBox>
    <ListBox.ItemsSource>
        <x:Array Type="sys:String">
            <sys:String>1st item</sys:String>
            <sys:String>2nd item</sys:String>
        </x:Array>
    </ListBox.ItemsSource>
    
    <ListBox.ContextMenu>
        <ContextMenu>
            <MenuItem Header="Test"/>
        </ContextMenu>
    </ListBox.ContextMenu>

    <ListBox.Resources>
        <Style TargetType="ListBoxItem">
            <Style.Resources>
                <SolidColorBrush x:Key="{x:Static SystemColors.ActiveBorderBrushKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.ActiveBorderColorKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.ActiveCaptionBrushKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.ActiveCaptionColorKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.ActiveCaptionTextBrushKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.ActiveCaptionTextColorKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.ControlColorKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.ControlDarkBrushKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.ControlDarkColorKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.ControlDarkDarkBrushKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.ControlDarkDarkColorKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.ControlLightBrushKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.ControlLightColorKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.ControlLightLightBrushKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.ControlLightLightColorKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.ControlTextBrushKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.ControlTextColorKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.InactiveBorderBrushKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.InactiveBorderColorKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.InactiveCaptionBrushKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.InactiveCaptionColorKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.InactiveCaptionTextBrushKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.InactiveCaptionTextColorKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.InactiveSelectionHighlightBrushKey}" Color="Red" />
                <SolidColorBrush x:Key="{x:Static SystemColors.InactiveSelectionHighlightTextBrushKey}" Color="Red" />
            </Style.Resources>
        </Style>
    </ListBox.Resources>
</ListBox>

样式定义对ListBoxItem 没有任何影响。这段代码有什么问题？

Answer 1

尝试将颜色移至 ListBox 的 Resources。它应该仅为 ListBox 及其子项 (ListboxItems) 更改系统颜色。

<ListBox.Resources>
        <SolidColorBrush x:Key="{x:Static SystemColors.ActiveBorderBrushKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.ActiveBorderColorKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.ActiveCaptionBrushKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.ActiveCaptionColorKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.ActiveCaptionTextBrushKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.ActiveCaptionTextColorKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.ControlColorKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.ControlDarkBrushKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.ControlDarkColorKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.ControlDarkDarkBrushKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.ControlDarkDarkColorKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.ControlLightBrushKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.ControlLightColorKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.ControlLightLightBrushKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.ControlLightLightColorKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.ControlTextBrushKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.ControlTextColorKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.InactiveBorderBrushKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.InactiveBorderColorKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.InactiveCaptionBrushKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.InactiveCaptionColorKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.InactiveCaptionTextBrushKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.InactiveCaptionTextColorKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.InactiveSelectionHighlightBrushKey}" Color="Red" />
        <SolidColorBrush x:Key="{x:Static SystemColors.InactiveSelectionHighlightTextBrushKey}" Color="Red" />
    </ListBox.Resources>

Answer 2

恐怕这是不可能的，因为画笔是硬编码在 ListBoxItem 的默认模板中的。

因此您必须将整个模板复制到您的 XAML 标记中，然后根据您的要求进行修改。

您不能在不使用自定义模板的情况下“覆盖”画笔。

WPF ListBoxItem：按样式覆盖 SystemColors 无效

WPF ListBoxItem: Overwrite SystemColors by Style has no effect

c#

wpf

listboxitem