WPF TreeView：如何为所有树元素添加触发器

Question

窗口右侧包含数据，当您将其拖动到左侧时，这些项目的颜色变为灰色。我有一个需要隐藏灰色元素的按钮。

Image: The data is highlighted in gray, the hide button is disabled.

Image: The data is highlighted in gray, the hide button is enable, the item is hidden.

但是，如果我拖动内部 treeviewitem，什么都不会发生

Image: Inner element is dragged, the hide button is disable

Image: Inner element is dragged, the hide button is enable

如何更改代码以使触发器适用于所有元素？

TreeView XAML：

 <TreeView
                Grid.Column="2"
                x:Name="RevitCategories">
                <TreeView.ItemContainerStyle>
                    <Style
                        TargetType="TreeViewItem">
                        <EventSetter
                            Event="DragOver"
                            Handler="RevitCategories_OnDragOver" />
                        <EventSetter
                            Event="MouseMove"
                            Handler="RevitCategories_OnMouseMove" />
                        <Style.Triggers>
                            <MultiDataTrigger>
                                <MultiDataTrigger.Conditions>
                                    <Condition
                                        Binding="{Binding Path=ShowUsages, UpdateSourceTrigger=PropertyChanged}"
                                        Value="False" />
                                    <Condition
                                        Binding="{Binding RelativeSource={RelativeSource Mode=Self}, Path=Foreground,
                                        Converter={vm:ColorToHiddenConverter}, UpdateSourceTrigger=PropertyChanged}"
                                        Value="False" />
                                </MultiDataTrigger.Conditions>
                                <Setter
                                    Property="Visibility"
                                    Value="Collapsed" />
                            </MultiDataTrigger>
                        </Style.Triggers>
                    </Style>
                </TreeView.ItemContainerStyle>
                <TreeView.ItemTemplate>
                    <HierarchicalDataTemplate>
                        <TextBlock
                            FontSize="{DynamicResource MediumFontSize}"
                            FontFamily="{DynamicResource FontFamily}" />
                    </HierarchicalDataTemplate>
                </TreeView.ItemTemplate>
            </TreeView>

转换器：

public class ColorToHiddenConverter : MarkupExtension, IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        var brush = (Brush) value;
        var colorSample = Colors.Gray;
        return brush.Equal(colorSample);
    }

    public object ConvertBack(object value, Type targetType, object parameter,
        CultureInfo culture) => null;

    public override object ProvideValue(IServiceProvider serviceProvider) => this;
}

Answer 1

已解决：我将 更改为 并且有效