当鼠标悬停（或选择）特定项目时，Datatrigger listview 的 ItemContainer 不起作用

Question

在 ListView 中，我使用 DataTrigger 条件将项目（文本块）的背景颜色绑定到整数属性，因为当属性更改（从 0 到 1）时，我想要项目的背景从透明变为红色。

此触发器在两种情况下不起作用：当鼠标悬停在项目上时，或者选择此特定项目时。在这两种情况下，背景总是透明的，尽管属性的值。

所以只有当鼠标悬停在其他不同的项目上，或者其他项目被选中时，项目才会改变它的背景。

textblock是在一个单独的DataTemplate中定义的（它是BoardViewModel的一部分），ListView是这些VM的集合。在我的代码中，我检查了文本块的描述中没有 "isMouseOver" 活动触发条件，并且列表视图部分中没有 "isSelected" 活动触发器。我也试过删除结构的背景，但对问题没有影响。

--数据模板---

    <DataTemplate DataType="{x:Type viewModels:BoardViewModel}">
        <Grid >

            <Grid HorizontalAlignment="Stretch"  Grid.Row="0" Width="Auto" Height="Auto">
                <Border Margin="20,20,20,20" BorderThickness="2" BorderBrush="Transparent" HorizontalAlignment="Stretch">
                    <TextBlock HorizontalAlignment="Stretch">
                        <TextBlock.Text>
                            <MultiBinding StringFormat="ID: {0}">
                                <Binding Path="ID"/>
                            </MultiBinding>
                        </TextBlock.Text>
        </TextBlock>
                </Border>
            </Grid>

        </Grid>
    </DataTemplate>

--- 查看 ---

        <Grid Grid.Row="0">
            <ListView Height="Auto" Background="{StaticResource BoardBackground}" ItemsSource="{Binding Path= BoardViewModels}" SelectedItem="{Binding CurrentBoardViewModel}" IsSynchronizedWithCurrentItem="true">
                <ListView.ItemContainerStyle>
                    <Style TargetType="{x:Type ListViewItem}">

                        <Setter Property="HorizontalContentAlignment" Value="Stretch"></Setter>
                        <Style.Triggers>
                            <DataTrigger Binding="{Binding Path= ErrorRedFlagByBoard}" Value="1">
                                <Setter Property="Background" Value="Red"></Setter>
                            </DataTrigger>
                            <DataTrigger Binding="{Binding Path= ErrorRedFlagByBoard}" Value="0">
                                <Setter Property="Background" Value="Transparent"></Setter>
                            </DataTrigger>

                        </Style.Triggers>
                    </Style>
                </ListView.ItemContainerStyle>
            </ListView>
        </Grid>

I checked the correct value of the integer 属性 of the viewmodel, so I expected that item's background remains red also when item is selected or mouse is over the item, but something invalidate this assertion and I do不明白什么。谢谢大家

Answer 1

尝试为 ListViewItem 定义自定义 ControlTemplate，并将触发器添加到 <ControlTemplate.Triggers>:

<Style TargetType="{x:Type ListViewItem}">
    <Style.Resources>
        <SolidColorBrush x:Key="Item.MouseOver.Background" Color="#1F26A0DA"/>
        <SolidColorBrush x:Key="Item.MouseOver.Border" Color="#a826A0Da"/>
        <SolidColorBrush x:Key="Item.SelectedInactive.Background" Color="#3DDADADA"/>
        <SolidColorBrush x:Key="Item.SelectedInactive.Border" Color="#FFDADADA"/>
        <SolidColorBrush x:Key="Item.SelectedActive.Background" Color="#3D26A0DA"/>
        <SolidColorBrush x:Key="Item.SelectedActive.Border" Color="#FF26A0DA"/>
    </Style.Resources>
    <Setter Property="HorizontalContentAlignment" Value="Stretch"></Setter>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type ListViewItem}">
                <Border x:Name="Bd" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true">
                    <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                </Border>
                <ControlTemplate.Triggers>
                    <MultiTrigger>
                        <MultiTrigger.Conditions>
                            <Condition Property="IsMouseOver" Value="True"/>
                        </MultiTrigger.Conditions>
                        <Setter Property="Background" TargetName="Bd" Value="{StaticResource Item.MouseOver.Background}"/>
                        <Setter Property="BorderBrush" TargetName="Bd" Value="{StaticResource Item.MouseOver.Border}"/>
                    </MultiTrigger>
                    <MultiTrigger>
                        <MultiTrigger.Conditions>
                            <Condition Property="Selector.IsSelectionActive" Value="False"/>
                            <Condition Property="IsSelected" Value="True"/>
                        </MultiTrigger.Conditions>
                        <Setter Property="Background" TargetName="Bd" Value="{StaticResource Item.SelectedInactive.Background}"/>
                        <Setter Property="BorderBrush" TargetName="Bd" Value="{StaticResource Item.SelectedInactive.Border}"/>
                    </MultiTrigger>
                    <MultiTrigger>
                        <MultiTrigger.Conditions>
                            <Condition Property="Selector.IsSelectionActive" Value="True"/>
                            <Condition Property="IsSelected" Value="True"/>
                        </MultiTrigger.Conditions>
                        <Setter Property="Background" TargetName="Bd" Value="{StaticResource Item.SelectedActive.Background}"/>
                        <Setter Property="BorderBrush" TargetName="Bd" Value="{StaticResource Item.SelectedActive.Border}"/>
                    </MultiTrigger>
                    <Trigger Property="IsEnabled" Value="False">
                        <Setter Property="TextElement.Foreground" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                    </Trigger>
                    <DataTrigger Binding="{Binding Path= ErrorRedFlagByBoard}" Value="1">
                        <Setter Property="Background" TargetName="Bd" Value="Red"></Setter>
                    </DataTrigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

默认模板中的触发器优先于您的触发器。

当鼠标悬停（或选择）特定项目时，Datatrigger listview 的 ItemContainer 不起作用

Datatrigger listview's ItemContainer does not work when mouse is over (or selected) the specific item

wpf

xaml

listview

background

datatrigger