更改禁用列表视图的背景

Question

我想设置禁用 ListView 的样式。但无论我做什么，listView 在禁用时都保持默认样式。

我已经尝试过的：

1. 根据此线程将系统颜色SystemColors.ControlBrushKey 设置为Transparent：Change disabled listbox background to gray
2. 我也在MSDN查看了listView的样式，重新定义了DisabledBorderLightColor
3. 当然我还创建了一个触发器

所有这些尝试都可以在窗口的资源部分中看到：

<Window.Resources>
    <Style TargetType="{x:Type ListView}">
        <Style.Resources>
            <Color x:Key="DisabledBorderLightColor">#FF00FF00</Color>
            <SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}" Color="Transparent"/>
        </Style.Resources>
        <Setter Property="Background" Value="Green"/>
        <Style.Triggers>
            <Trigger Property="IsEnabled" Value="False">
                <Setter Property="Background" Value="Red"/>
            </Trigger>
        </Style.Triggers>
    </Style>
</Window.Resources>
<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="25"/>
        <RowDefinition/>
    </Grid.RowDefinitions>
    <Button Content="Unselect" Click="UnselectItem"></Button>
    <ListView x:Name="_listView" 
              Grid.Row="1"
              d:DataContext="{d:DesignData ObjectToShow}" 
              IsEnabled="True"
              SelectionChanged="SelectItem">
        <ListView.View>
            <GridView>
                <GridView.Columns>
                    <GridViewColumn Header="Header1" DisplayMemberBinding="{Binding Property1}"/>
                    <GridViewColumn Header="Header2" DisplayMemberBinding="{Binding Property2}"/>
                </GridView.Columns>
            </GridView>
        </ListView.View>
    </ListView>
</Grid>

这是相应的c#：

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();

        var objectsToShow = new List<ObjectToShow>
        {
            new ObjectToShow
            {
                Property1 = "Content1Property1",
                Property2 = "Content1Property2"
            },
            new ObjectToShow
            {
                Property1 = "Content2Property1",
                Property2 = "Content2Property2"
            },
        };

        _listView.ItemsSource = objectsToShow;
    }

    private void SelectItem(object sender, SelectionChangedEventArgs e)
    {
        _listView.IsEnabled = false;
    }

    private void UnselectItem(object sender, RoutedEventArgs e)
    {
        _listView.SelectedItem = null;
        _listView.IsEnabled = true;
    }
}

public class ObjectToShow
{
    public string Property1 { get; set; }

    public string Property2 { get; set; }
}

我只希望 listView 在禁用时具有红色背景。我怎样才能做到这一点？

Answer 1

将您的 ListView 样式更改为以下内容：

    <Style TargetType="{x:Type ListView}">
        <Setter Property="Background" Value="Green"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ListView}">
                    <Microsoft_Windows_Themes:ListBoxChrome x:Name="Bd" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" RenderMouseOver="{TemplateBinding IsMouseOver}" RenderFocused="{TemplateBinding IsKeyboardFocusWithin}" SnapsToDevicePixels="true">
                        <ScrollViewer Padding="{TemplateBinding Padding}" Style="{DynamicResource {x:Static GridView.GridViewScrollViewerStyleKey}}">
                            <ItemsPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                        </ScrollViewer>
                    </Microsoft_Windows_Themes:ListBoxChrome>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsGrouping" Value="true">
                            <Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <!-- Here comes your custom disabled background color -->
                            <Setter Property="Background" TargetName="Bd"
                                    Value="Red"/>
                            <!-- Here comes your custom disabled background color -->
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

当你不得不覆盖整个控件模板，只是为了改变它的一小部分时，这很烦人......但有时你别无选择。

在这种情况下，由于更改背景颜色的触发器位于 ControlTemplate 中，因此无法使用样式触发器覆盖它。

Answer 2

我认为您必须定义自己的控件模板来覆盖此控件的默认 ListView 模板。

或者你可以试试内置控制画笔是否满足你的需要：

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