选择 WPF 的 ListBoxItem 背景并 Window 失去焦点时更改它

Question

当我遇到以下问题时，我正在使用 MahApps:Metro（不知道它是否相关）进行研究项目：

有没有办法改变 ListBoxItem 的 Background 只有被选中并且 Window 失去焦点？

见下图说明：

这里我们可以看到我的列表框，当 window 有焦点时，第一个项目被选中。

在第二张图片上，我们可以看到当焦点在 Window 二号上时的样子。

我想知道是否有办法将 SelectedItem 的蓝色 Background 更改为浅灰色，例如 only 当Window 失去焦点。

以下是我目前查看的内容：

覆盖 ControlBrushKey（实际上是一种工作，但在 window 具有焦点时替换样式）[1] [2] [3]
覆盖HighlightBrushKey（同样的问题）[1]

谢谢！

Answer 1

目前只有您自己覆盖 ListBoxItem 样式才有可能（我将在 MahApps 的下一版本中更改它）。

这就是你需要的：

<MultiTrigger>
    <MultiTrigger.Conditions>
        <Condition Property="IsSelected" Value="True" />
        <Condition Property="Selector.IsSelectionActive" Value="False" />
    </MultiTrigger.Conditions>
    <Setter Property="Background" Value="{DynamicResource GrayBrush7}" />
</MultiTrigger>

完整样式：

<Style x:Key="CustomMetroListBoxItem"
       BasedOn="{StaticResource MetroListBoxItem}"
       TargetType="{x:Type ListBoxItem}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type ListBoxItem}">
                <Border x:Name="Border"
                        Background="{TemplateBinding Background}"
                        BorderBrush="{TemplateBinding BorderBrush}"
                        BorderThickness="{TemplateBinding BorderThickness}"
                        SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}">
                    <ContentPresenter Margin="{TemplateBinding Padding}"
                                      HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                      VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                                      SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
    <Style.Triggers>
        <Trigger Property="IsSelected" Value="True">
            <Setter Property="Background" Value="{DynamicResource AccentColorBrush}" />
            <Setter Property="Foreground" Value="{DynamicResource AccentSelectedColorBrush}" />
        </Trigger>
        <Trigger Property="IsMouseOver" Value="True">
            <Setter Property="Background" Value="{DynamicResource AccentColorBrush3}" />
        </Trigger>
        <Trigger Property="IsEnabled" Value="False">
            <Setter Property="Foreground" Value="{DynamicResource GrayBrush7}" />
        </Trigger>
        <MultiTrigger>
            <MultiTrigger.Conditions>
                <Condition Property="IsEnabled" Value="False" />
                <Condition Property="IsSelected" Value="True" />
            </MultiTrigger.Conditions>
            <Setter Property="Background" Value="{DynamicResource GrayBrush7}" />
            <Setter Property="Foreground" Value="{DynamicResource AccentSelectedColorBrush}" />
        </MultiTrigger>
        <MultiTrigger>
            <MultiTrigger.Conditions>
                <Condition Property="IsSelected" Value="True" />
                <Condition Property="Selector.IsSelectionActive" Value="False" />
            </MultiTrigger.Conditions>
            <Setter Property="Background" Value="{DynamicResource GrayBrush7}" />
        </MultiTrigger>
        <MultiTrigger>
            <MultiTrigger.Conditions>
                <Condition Property="IsSelected" Value="True" />
                <Condition Property="Selector.IsSelectionActive" Value="True" />
            </MultiTrigger.Conditions>
            <Setter Property="Background" Value="{DynamicResource AccentColorBrush2}" />
        </MultiTrigger>
    </Style.Triggers>
</Style>

用法：

<ListBox ItemContainerStyle="{StaticResource CustomMetroListBoxItem}"
         Style="{StaticResource VirtualisedMetroListBox}" />

希望对您有所帮助！

Answer 2

下面的例子解决了你的问题。注意 MultiDataTrigger.

<Window.Resources>
    <DataTemplate x:Key="DataTemplate1">
        <Grid Width="200" Background="Lime">
            <TextBlock Text="{Binding}" Foreground="Black"/>
        </Grid>
    </DataTemplate>
    <DataTemplate x:Key="DataTemplate2">
        <Grid Width="200" Background="DarkGray">
            <TextBlock Text="{Binding}" Foreground="Black"/>
        </Grid>
    </DataTemplate>
    <DataTemplate x:Key="DataTemplate1Sel">
        <Grid Width="200" Background="Coral">
            <TextBlock Text="{Binding}" Foreground="Black"/>
        </Grid>
    </DataTemplate>
</Window.Resources>

<ListBox x:Name="Lst" Margin="0,56,10,0">
    <ListBox.Resources>
        <Style TargetType="ListBoxItem">
            <Style.Triggers>
                <Trigger Property="IsSelected" Value="True">
                    <Setter Property="ContentTemplate" Value="{DynamicResource DataTemplate1Sel}"/>
                </Trigger>
                <Trigger Property="IsSelected" Value="False">
                    <Setter Property="ContentTemplate" Value="{DynamicResource DataTemplate1}"/>
                </Trigger>
                <MultiDataTrigger>
                    <MultiDataTrigger.Conditions>
                        <Condition  Binding="{Binding IsActive, RelativeSource={RelativeSource AncestorType=Window, Mode=FindAncestor}}" Value="False"/>
                        <Condition  Binding="{Binding IsSelected, RelativeSource={RelativeSource Self}}" Value="True"/>
                    </MultiDataTrigger.Conditions>
                    <MultiDataTrigger.Setters>
                        <Setter Property="ContentTemplate" Value="{DynamicResource DataTemplate2}"/>
                    </MultiDataTrigger.Setters>
                </MultiDataTrigger>
            </Style.Triggers>
        </Style>
    </ListBox.Resources>
</ListBox>

选择 WPF 的 ListBoxItem 背景并 Window 失去焦点时更改它

Change WPF's ListBoxItem Background when it's selected and Window lost focus

c#

wpf

listbox

listboxitem

mahapps.metro