将 TabControl ItemsSource 绑定到 ViewModel 的集合 [英] Binding TabControl ItemsSource to Collection of ViewModels

问题描述

出于某种原因，当将 ItemsSource 绑定到视图的 ObservableCollection 时，我花了很长时间让我的 TabControl 正确显示楷模.我的设计基于此处找到的教程:http://msdn.microsoft.com/en-us/magazine/dd419663.aspx.我确实在这里找到了一些像我这样的问题，但没有一个解决我的特殊情况.这是我在 xaml 中的 TabControl.

For some reason I am having a heck of a time getting my TabControl to display properly when binding the ItemsSource to a ObservableCollection of view models. I'm basing my design off of the tutorial found here: http://msdn.microsoft.com/en-us/magazine/dd419663.aspx. I did find a few questions like mine here but none addressed my particular situation. This is my TabControl in xaml.

<TabControl ItemsSource="{Binding Workspaces}"
            SelectedIndex="{Binding ActiveWorkspaceIndex}"
            ItemTemplate="{StaticResource ClosableTabItemTemplate}"/>

其中 ClosableTabItemTemplate 如下所示.

<DataTemplate x:Key="ClosableTabItemTemplate">
        <DockPanel Width="120">
          <Button 
              Command="{Binding Path=CloseCommand}"
              Content="X"
              Cursor="Hand"
              DockPanel.Dock="Right"
              Focusable="False"
              FontFamily="Courier" 
              FontSize="9"
              FontWeight="Bold"  
              Margin="0,1,0,0"
              Padding="0"
              VerticalContentAlignment="Bottom"
              Width="16" Height="16" 
              />
          <ContentPresenter 
              Content="{Binding Path=DisplayName}" 
              VerticalAlignment="Center" 
              />
        </DockPanel>
      </DataTemplate>

Workspaces 是视图模型的 ObservableCollection.ActiveWorkspaceIndex 只是我在视图模型中跟踪的活动工作区索引.我通过 App.xaml 文件中的以下数据模板将我的视图模型与视图实例相关联.

Workspaces is the ObservableCollection of view models. ActiveWorkspaceIndex is just the active workspace index that I keep track of in the view model. I associate my view model with an instance of a view through the following data template in my App.xaml file.

<DataTemplate DataType="{x:Type vm:ViewModelStartPage}">
     <v:ViewStartPage/>
 </DataTemplate>

我只向我的工作区集合添加了一个视图模型.我看到选项卡控件中显示了 2 个视图，并且它们没有选项卡.这几乎就像 TabControl 不知道将不同的视图视为 TabItems，它的行为更像是一个堆栈面板，堆叠视图.如果我在代码中创建选项卡项目，它可以像这样正常工作:

I only add one view model to my collection of workspaces. I see 2 views display in the tab control and they aren't tabbed. It's almost like the TabControl doesnt know to treat the different views as TabItems, its behaving more like a stack panel, stacking the views. If I create the tab items in code it works fine like this:

System.Windows.Controls.TabItem i = new System.Windows.Controls.TabItem();
i.Content = new Views.ViewStartPage();
i.Header = "A Tab Item";
this.xTabControl.Items.Add(i); 

我一定是遗漏了一些内容模板之类的东西.我稍后会设计我的标签，但现在我很高兴让基本标签工作.此外，每个选项卡的选项卡内容中的视图可能不同，因此我无法使用随处可见的简单文本块 TabControl 模板示例...IE.不是这个...

I must be missing some content template or something. I will be styling my tabs later but for now I would be happy just getting the basic tabs working. Also the views in the tab contents may be different for each tab so I can't use the simple textblock TabControl template examples I see all over the place... I.e. not this...

<TabControl.ContentTemplate>
    <DataTemplate>
        <TextBlock
           Text="{Binding Content}" />
    </DataTemplate>

有什么想法吗?

推荐答案

我最终使用了带有 TabControl 数据模板的 ContentControl(就像原来的教程项目一样).这是我最终得到的 xaml 代码.我没有更改原始示例项目的代码隐藏来完成这项工作.ContentControl 在我的 MainWindow.xaml 中，另外两段代码在 ResourceDictionary 中.

I ended up using a ContentControl with a TabControl data template (like the original tutorial project). Here is the xaml code I ended up with. I did not change the code-behind from the original sample project to make this work. The ContentControl is in my MainWindow.xaml and the other two pieces of code were in a ResourceDictionary.

<!-- Workspaces Tab Control -->
      <ContentControl Grid.Row="1"
                      VerticalAlignment="Stretch"
                      HorizontalAlignment="Stretch"
                      Content="{Binding Path=Workspaces}"
                      ContentTemplate="{StaticResource WorkspacesTemplate}"/>

<!-- Workspaces Template -->
  <DataTemplate x:Key="WorkspacesTemplate">
    <TabControl Style="{StaticResource ClosableTabControl}"
                IsSynchronizedWithCurrentItem="True"
                ItemsSource="{Binding}"
                ItemTemplate="{StaticResource WorkspaceTabItemTemplate}"
                Margin="1"/>
  </DataTemplate>


<!-- Workspace Tab Item Template -->
  <DataTemplate x:Key="WorkspaceTabItemTemplate">
    <Grid Width="Auto" Height="Auto">
      <ContentPresenter ContentSource="Header" Margin="3" 
                        Content="{Binding Path=DisplayName}"
                        HorizontalAlignment="Center" VerticalAlignment="Center">
        <ContentPresenter.Resources>
          <Style TargetType="TextBlock">
            <Setter Property="Foreground" Value="{StaticResource Foreground}"/>
          </Style>
        </ContentPresenter.Resources>
      </ContentPresenter>
    </Grid>
  </DataTemplate>

这篇关于将 TabControl ItemsSource 绑定到 ViewModel 的集合的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！