Question

在ListView中，我使用DataTrigger条件将Item（文本块）的背景色绑定到Integer属性，因为当该属性从0更改为1时，我希望该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：当鼠标悬停在该项目上时，或选择此特定项目时。在这两种情况下，尽管具有财产价值，但背景始终是透明的。

因此，仅当鼠标悬停在其他不同项目上或选择了其他项目时，该项目才会更改其背景。

该文本块在单独的DataTemplate中定义（它是BoardViewModel的一部分），而ListView是这些VM的集合。在我的代码中，我检查了文本块描述中是否没有“ isMouseOver”活动触发器条件，并且列表视图的部分中没有“ isSelected”活动触发器。我还尝试删除结构的背景，但这对问题没有影响。

-DataTemplate ---

    <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>

我检查了viewmodel的integer属性的正确值，所以我希望当选择了项目或鼠标悬停在项目上时，项目的背景也会保持红色，但是有些东西使该断言无效并且我不明白。谢谢大家。

Answer 1

尝试为ControlTemplate定义自定义ListViewItem，然后将触发器添加到<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（或选中）特定项目时，Datatrigger列表视图的ItemContainer不起作用

1 个答案: