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已选择树状视图项,未触发鼠标按钮按下事件

treeviewitem treeview xaml wpf c#

V K · 技术社区 · 7 年前

我已经为树状视图创建了视图模型。还创建了它们的绑定。我创建了样式触发器,这样每当选择树视图项时,其背景都会发生变化。但背景没有改变。我处理了树状视图项的选中项和鼠标左键按下事件,以查看该项是否被选中。但这两个事件都没有发生。下面是XAML。

<TreeView Grid.Row="0" x:Name="TreeViewLocalSystem"  BorderBrush="Transparent" Panel.ZIndex="0">
     <TreeView.ItemContainerStyle>
        <Style TargetType="TreeViewItem">
            <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
            <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
            <Style.Triggers>
                <Trigger Property="IsSelected" Value="True">
                    <Setter Property="Background" Value="{StaticResource TextBoxBackgroundColor}"></Setter>
                </Trigger>
                <Trigger Property="IsSelected" Value="False">
                    <Setter Property="Background" Value="Transparent"></Setter>
                </Trigger>
            </Style.Triggers>
        </Style>
    </TreeView.ItemContainerStyle>
    <TreeView.Resources>
        <HierarchicalDataTemplate ItemsSource="{Binding Path=Children}"   DataType="{x:Type local:LocalTreeViewItemModel}">
            <TreeViewItem Header="{Binding Path=Text}"  Selected="TreeViewItem_Selected" HorizontalAlignment="Left" FontSize="{StaticResource MediumFontSize}" MouseLeftButtonDown="TreeViewItem_MouseLeftButtonDown" />
        </HierarchicalDataTemplate>
    </TreeView.Resources>
</TreeView>

我做错了什么?

1 回复 | 直到 7 年前

mm8 7 年前

你可以处理 PreviewMouseLeftButtonDown 的事件 TreeViewItem :

<TreeView Grid.Row="0" x:Name="TreeViewLocalSystem"  BorderBrush="Transparent" Panel.ZIndex="0">
    <TreeView.ItemContainerStyle>
        <Style TargetType="TreeViewItem">
            <EventSetter Event="PreviewMouseLeftButtonDown" Handler="TreeViewLocalSystem_PreviewMouseLeftButtonDown" />
            <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
            <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
            <Style.Triggers>
                <Trigger Property="IsSelected" Value="True">
                    <Setter Property="Background" Value="{StaticResource TextBoxBackgroundColor}"></Setter>
                </Trigger>
                <Trigger Property="IsSelected" Value="False">
                    <Setter Property="Background" Value="Transparent"></Setter>
                </Trigger>
            </Style.Triggers>
        </Style>
    </TreeView.ItemContainerStyle>
    <TreeView.Resources>
        <HierarchicalDataTemplate ItemsSource="{Binding Path=Children}" DataType="{x:Type local:LocalTreeViewItemModel}">
            <TextBlock Text="{Binding Path=Text}" HorizontalAlignment="Left" FontSize="{StaticResource MediumFontSize}" />
        </HierarchicalDataTemplate>
    </TreeView.Resources>
</TreeView>

private void TreeViewLocalSystem_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    //...
}