当一个列表框被选中时，改变未选中项的不透明度

Question

我有一个列表框，定义了DataTemplate, Style和ItemContainerStyle。

这个列表框有SelectionMode="Single"

最初所有项目都有Opacity="0.7"，当项目被选中时，我将其设置为Opacity="1"

<ListBox.ItemContainerStyle> 
<Style TargetType="{x:Type ListBoxItem}"> 
    <Style.Setters>
        <Setter Property="Opacity" Value="0.7"/>
    </Style.Setters>
    <Style.Triggers> 
        <DataTrigger Binding="{Binding IsEventLocked}" Value="False"> 
            <Setter Property="IsEnabled" Value="False"/>
            <Setter Property="Opacity" Value="0.2"/>
        </DataTrigger>
        <Trigger Property="IsSelected" Value="True">
            <Setter Property="Opacity" Value="1"/>
        </Trigger>
    </Style.Triggers> 
</Style> 

但我也需要使所有其他(未选定)项目与Opacity="0.2"，直到选定的项目将被取消选择。

简而言之:[Initial (Opacity=0.7)]->[ItemSelected = {(SelectedItem:Opacity=1)， (All Unselected items: Opacity=0.2)}]->[Item Deselected (SelectedItem==null) =(Opacity=0.7)]

谢谢你的建议和想法!

Answer 1

触发点:选区存在&&自己没有被选中

应该这样做:

<Style TargetType="ListBoxItem">
    <Setter Property="Opacity" Value="0.7" />
    <Style.Triggers>
        <MultiDataTrigger>
            <MultiDataTrigger.Conditions>
                <Condition Binding="{Binding IsSelected, RelativeSource={RelativeSource Self}}"
                        Value="false" />
                <Condition
                        Binding="{Binding SelectedItems.Count, RelativeSource={RelativeSource AncestorType=ListBox}}"
                        Value="1" />
            </MultiDataTrigger.Conditions>
            <Setter Property="Opacity" Value="0.2" />
        </MultiDataTrigger>
        <Trigger Property="IsSelected" Value="True">
            <Setter Property="Opacity" Value="1" />
        </Trigger>
    </Style.Triggers>
</Style>