wpf - 单击鼠标后如何停止 TreeView 折叠事件

Question

如何在鼠标单击 TreeViewItem 箭头(在 View 上)后停止 treeview 折叠事件？我需要始终显示展开的 TreeView 。

Answer 1

您可以在 XAML 中设置 Collapsed 事件:

<TreeView 
    Name="myTreeView"
    ItemsSource="{Binding dataSource}">
            <TreeView.ItemContainerStyle>
                <Style TargetType="TreeViewItem">
                    <Setter Property="IsExpanded" Value="True" />
                    <Style.Triggers>
                        <EventTrigger RoutedEvent="Collapsed">
                            <EventTrigger.Actions>
                                <BeginStoryboard>
                                    <Storyboard>
                                        <BooleanAnimationUsingKeyFrames 
                                            Duration="0" 
                                            Storyboard.TargetProperty="(TreeViewItem.IsExpanded)">
                                            <DiscreteBooleanKeyFrame KeyTime="0" Value="True" />
                                        </BooleanAnimationUsingKeyFrames>
                                    </Storyboard>
                                </BeginStoryboard>
                            </EventTrigger.Actions>
                        </EventTrigger>
                    </Style.Triggers>
                </Style>                            
            </TreeView.ItemContainerStyle>
        </TreeView>