WPF ListView在列表视图之间移动时选择添加的项

Question

我有一个视图，其中有2个listviews绑定到CollectionViewSources，这些CollectionViewSources是从我的视图模型

每个listview项都被模板化为一个textblock和一个Button-UnitsinMeasureListView.ItemTemplate按钮绑定到一个命令，该命令将该项从其绑定的集合中移除，并将其添加到AvailableUnitsListView上的集合中。

ItemTemplate按钮的情况正好相反，它从availableUnitsListView中移除它，并将其添加到UnitsinMeasureListView中。

这一切都很好，根据需要从每个listview中删除和添加项。

当unitsInMeasureListView仍有焦点时，有没有办法自动选择添加到availableUnitsListView中的项？

 <CollectionViewSource x:Key="unitsInMeasureViewSource" Source="{Binding Path=MeasureUnits}">
                <CollectionViewSource.SortDescriptions>
                    <componentModel:SortDescription PropertyName="UnitInMeasure.IsPredefined" Direction="Descending" />
                    <componentModel:SortDescription PropertyName="UnitInMeasure.Name"  />
                </CollectionViewSource.SortDescriptions>
            </CollectionViewSource>
            <CollectionViewSource x:Key="availableUnitsViewSource" Source="{Binding Path=AvailableUnits}">
                <CollectionViewSource.SortDescriptions>
                    <componentModel:SortDescription PropertyName="UnitInMeasure.IsPredefined" Direction="Descending" />
                    <componentModel:SortDescription PropertyName="UnitInMeasure.Name"  />
                </CollectionViewSource.SortDescriptions>
            </CollectionViewSource>

<ListView Grid.Row="1" x:Name="unitsInMeasureListView" BorderThickness="1" BorderBrush="Gray" VerticalAlignment="Stretch" ScrollViewer.VerticalScrollBarVisibility="Auto" HorizontalContentAlignment="Stretch" ItemsSource="{Binding Source={StaticResource unitsInMeasureViewSource}}">
                        <ListView.ItemTemplate>
                            <DataTemplate>
                                <Border Margin="0 3" >
                                    <DockPanel>
                                        <TextBlock x:Name="unitItem" DockPanel.Dock="Left" Height="20" VerticalAlignment="Center" >
                                            <TextBlock.Text>
                                                <MultiBinding StringFormat=" {0} ({1})" >
                                                    <Binding Path="UnitInMeasure.Name" />
                                                    <Binding Path="UnitInMeasure.Symbol" />
                                                </MultiBinding>
                                            </TextBlock.Text>
                                            <TextBlock.Style>
                                                <Style>
                                                    <Style.Triggers>
                                                        <DataTrigger Binding="{Binding Path=UnitInMeasure.IsPredefined}" Value="false">
                                                            <Setter Property="TextBlock.FontStyle" Value="Italic"/>
                                                        </DataTrigger>
                                                    </Style.Triggers>
                                                </Style>
                                            </TextBlock.Style>
                                                <TextBlock.InputBindings>
                                                    <MouseBinding MouseAction="LeftDoubleClick" Command="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=ListView}, Path=DataContext.EditUnitCommand}" CommandParameter="{Binding Path=UnitInMeasure}" />
                                                </TextBlock.InputBindings>
                                        </TextBlock>
                                        <Button Command="{Binding Path=RemoveUnitFromMeasureCommand}" DockPanel.Dock="Right" HorizontalAlignment="Right" Style="{StaticResource TransparentStyle}" >
                                            <Button.Visibility>
                                                <MultiBinding Converter="{StaticResource multiBindingToVisibilityConverter}">
                                                    <Binding Path="IsSelected" RelativeSource="{RelativeSource AncestorType={x:Type ListViewItem}}"/>
                                                    <Binding Path="IsMeasureEditable"/>
                                                    <Binding Path="CanRemoveUnit" />
                                                </MultiBinding>
                                            </Button.Visibility>
                                            <Image Source="../../Images/Small/navigate_minus.png" ToolTip="Remove unit from measure" >
                                                <Image.Visibility>
                                                    <MultiBinding Converter="{StaticResource multiBindingToVisibilityConverter}">
                                                        <Binding Path="IsFocused" RelativeSource="{RelativeSource AncestorType={x:Type ListViewItem}}"/>
                                                    </MultiBinding>
                                                </Image.Visibility>
                                            </Image>
                                        </Button>
                                    </DockPanel>
                                </Border>
                            </DataTemplate>
                        </ListView.ItemTemplate>
                    </ListView>                        
<ListView Grid.Row="3" x:Name="availableUnitsListView" BorderThickness="1" BorderBrush="Gray" VerticalAlignment="Stretch" ScrollViewer.VerticalScrollBarVisibility="Auto" HorizontalContentAlignment="Stretch" ItemsSource="{Binding Source={StaticResource availableUnitsViewSource}}">
                        <ListView.ItemTemplate>
                            <DataTemplate>
                                <Border Margin="3" >
                                    <DockPanel>
                                        <TextBlock  x:Name="measure" Height="20" VerticalAlignment="Center">
                                                <TextBlock.Text>
                                                    <MultiBinding StringFormat=" {0} ({1})" >
                                                        <Binding Path="UnitInMeasure.Name" />
                                                        <Binding Path="UnitInMeasure.Symbol" />
                                                    </MultiBinding>
                                                </TextBlock.Text>
                                                <TextBlock.Style>
                                                    <Style>
                                                        <Style.Triggers>
                                                            <DataTrigger Binding="{Binding Path=UnitInMeasure.IsPredefined}" Value="false">
                                                                <Setter Property="TextBlock.FontStyle" Value="Italic"/>
                                                            </DataTrigger>
                                                        </Style.Triggers>
                                                    </Style>
                                                </TextBlock.Style>
                                        </TextBlock>
                                        <Button Command="{Binding Path=AddUnitToMeasureCommand}" DockPanel.Dock="Right" HorizontalAlignment="Right" Style="{StaticResource TransparentStyle}" >
                                            <Button.Visibility>
                                                <MultiBinding Converter="{StaticResource multiBindingToVisibilityConverter}">
                                                    <Binding Path="IsSelected" RelativeSource="{RelativeSource AncestorType={x:Type ListViewItem}}"/>
                                                    <Binding Path="IsMeasureEditable"/>
                                                </MultiBinding>
                                            </Button.Visibility>
                                            <Image Source="../../Images/Small/navigate_plus.png" ToolTip="Add unit to measure"  >
                                                <Image.Visibility>
                                                    <MultiBinding Converter="{StaticResource multiBindingToVisibilityConverter}">
                                                        <Binding Path="IsFocused" RelativeSource="{RelativeSource AncestorType={x:Type ListViewItem}}"/>
                                                    </MultiBinding>
                                                </Image.Visibility>
                                            </Image>
                                        </Button>
                                    </DockPanel>
                                </Border>
                            </DataTemplate>
                        </ListView.ItemTemplate>
                    </ListView>

    /// <summary>
    /// Gets a list of all unit view models currently within this measure.
    /// </summary>
    public ReadOnlyObservableCollection<UnitInMeasureViewModel> MeasureUnits
    {
        get
        {
            return this._measureUnits;
        }
    }
    private readonly ReadOnlyObservableCollection<UnitInMeasureViewModel> _measureUnits;
    private readonly ObservableCollection<UnitInMeasureViewModel> measureUnits;

    /// <summary>
    /// Gets a list of all unit view models currently available to this measure.
    /// </summary>
    public ReadOnlyObservableCollection<UnitInMeasureViewModel> AvailableUnits
    {
        get
        {
            return this._availableUnits;
        }
    }
    private readonly ReadOnlyObservableCollection<UnitInMeasureViewModel> _availableUnits;
    private readonly ObservableCollection<UnitInMeasureViewModel> availableUnits;

    /// <summary>
    /// Adds a unit to this measure.
    /// </summary>
    /// <param name="vm">The view model for the unit to be added.</param>
    internal void AddUnitToMeasure(UnitInMeasureViewModel vm)
    {
        this.availableUnits.Remove(vm);
        this.measureUnits.Add(vm);
    }

    /// <summary>
    /// Removes a unit from this measure.
    /// </summary>
    /// <param name="vm">The view model for the unit to be removed.</param>
    internal void RemoveUnitFromMeasure(UnitInMeasureViewModel vm)
    {
        this.measureUnits.Remove(vm);
        this.availableUnits.Add(vm);
    }

Answer 1

将ListBox中的SelectedItem绑定到视图模型中的某个属性（例如X）。无论何时从ListBox中添加或删除项（AddUnitToMeasure方法和RemoveUnitFromMeasure方法），都需要更新这个X属性以更新ListBox中的选定项。