WPF - AvalonDock - 关闭文档

Question

我在 WPF 项目中使用 AvalonDock 和 MVVM。

当我点击“X”（选项卡的关闭按钮）时，我的文档将关闭但仍保留在内存中。似乎只是隐藏起来了。它不会从我的Model.Documents 收藏中删除。

如果我添加DockingManager_DocumentClosing 并尝试从集合中删除我的文档，我会在Xceed.Wpf.AvalonDock.Layout.LayoutContent 的以下方法中收到异常，因为parentAsContainer 为空。

/// <summary>
/// Close the content
/// </summary>
/// <remarks>Please note that usually the anchorable is only hidden (not closed). By default when user click the X button it only hides the content.</remarks>
public void Close()
{
    var root = Root;
    var parentAsContainer = Parent as ILayoutContainer;
    parentAsContainer.RemoveChild(this);
    if (root != null)
        root.CollectGarbage();
    OnClosed();
}

有人知道我如何在 AvalonDock 中管理可以从我的Model.Documents 中删除的文档，以便在我点击其Close 按钮时最终被处理掉吗？

供参考：这是我的 AvalonDock 的 XAML：

<avalonDock:DockingManager
    x:Name="DockingManager" 
    DocumentsSource="{Binding DocumentItems}"  
    ActiveContent="{Binding ActiveMainWindowViewModel,
        Converter={StaticResource RestrictedClassConverter},
        ConverterParameter={x:Type multiSimAnalysis:MainWindowViewModel},
        Mode=TwoWay}"
    DocumentClosing="DockingManager_DocumentClosing"
    ActiveContentChanged="DockingManager_ActiveContentChanged">

  <avalonDock:DockingManager.LayoutItemContainerStyleSelector>
    <pane:PanesStyleSelector>
      <pane:PanesStyleSelector.MainWindowViewLcStyle>
        <Style TargetType="{x:Type avalonDock:LayoutItem}">
          <Setter Property="Title" Value="{Binding Model.Title}"/>
          <Setter Property="ToolTip" Value="{Binding Model.Title}"/>
          <Setter Property="CloseCommand" Value="{Binding Model.CloseCommand}"/>
          <Setter Property="IconSource" Value="{Binding Model.IconSource}"/>
          <Setter Property="IsSelected" Value="{Binding Model.IsSelected, Mode=TwoWay}"/>
          <Setter Property="IsActive" Value="{Binding Model.IsActive, Mode=TwoWay}"/>
          <Setter Property="ContentId" Value="{Binding Model.ContentId}"/>
        </Style>
      </pane:PanesStyleSelector.MainWindowViewLcStyle>
    </pane:PanesStyleSelector>
  </avalonDock:DockingManager.LayoutItemContainerStyleSelector>

  <avalonDock:DockingManager.LayoutItemTemplateSelector>
    <multiSimAnalysis:PanesTemplateSelector>
      <multiSimAnalysis:PanesTemplateSelector.MainWindowLcTemplate>
        <DataTemplate>
          <multiSimAnalysis:MainWindowViewLc /> 
        </DataTemplate>
      </multiSimAnalysis:PanesTemplateSelector.MainWindowLcTemplate>
    </multiSimAnalysis:PanesTemplateSelector>
  </avalonDock:DockingManager.LayoutItemTemplateSelector>

  <avalonDock:DockingManager.Theme>
    <avalonDock:VS2010Theme/>
  </avalonDock:DockingManager.Theme>
  <avalonDock:LayoutRoot>
    <avalonDock:LayoutPanel Orientation="Horizontal">
      <avalonDock:LayoutAnchorablePane DockWidth="400">
        <avalonDock:LayoutAnchorable Title="Scope(s) selection" x:Name="PanelScopeSelection" IsVisible="True">
          <scopeSelection:UserControlSelectStudyScope x:Name="ToolScopeSelection"/>
        </avalonDock:LayoutAnchorable>
      </avalonDock:LayoutAnchorablePane>
      <avalonDock:LayoutDocumentPane/>
      <avalonDock:LayoutAnchorablePane DockWidth="150">
        <avalonDock:LayoutAnchorable Title="Properties" x:Name="PanelScopePropertyGrid">
          <!--<multiSimAnalysis:UserControlPropertyGrid x:Name="ToolPropertyGrid"  />-->
          <xctk:PropertyGrid x:Name="ToolPropertyGrid" SelectedObject="{Binding ActiveObject}" />
        </avalonDock:LayoutAnchorable>
      </avalonDock:LayoutAnchorablePane>
    </avalonDock:LayoutPanel>
  </avalonDock:LayoutRoot>
</avalonDock:DockingManager>

Answer 1

我发现在LayoutDocument 或LayoutAnchorablePane 上，应用此设置都有效：CanClose="False" 或CanFloat="False"。

它会移除关闭按钮。

<avalonDock:LayoutDocument Title="Board"
                           ContentId="Board"
                           CanClose="False"
                           CanFloat="False">
</avalonDock:LayoutDocument>

Answer 2

注册 IsVisibleChanged。

void layoutFPR_Hidden(object sender, EventArgs e)
{
    LayoutAnchorable window = (LayoutAnchorable)sender;
    YourClass content = window.Content as YourClass;

    // Close the object
    content = null;
    ((LayoutAnchorable)sender).Close();

}

Answer 3

我实际上找到了一个不可接受的解决方法。 真的很扭曲。

我只是把它作为参考。应该有一个干净的方法来做到这一点。

    // ************************************************************************
    private void DockingManager_DocumentClosing(object sender, Xceed.Wpf.AvalonDock.DocumentClosingEventArgs e)
    {
        e.Document.CanClose = false;

        DocumentModel documentModel = e.Document.Content as DocumentModel;
        if (documentModel != null)
        {
            Dispatcher.BeginInvoke(new Action(() => this.Model.DocumentItems.Remove(documentModel)), DispatcherPriority.Background);
        }
    }