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TreeViewItem.Expanded

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清歌不尽
清歌不尽 2021-01-14 23:36

Im using the latest version of mvvm light toolkit, however i\'m not clear how I can use EventToCommand for the event TreeViewItem.Expanded.

THis dosent work... what

2条回答
  • 余生分开走
    余生分开走 (楼主)
    2021-01-15 00:24

    I was able to do this by creating a custom ItemContainerStyle for the TreeView. You should be able to put this together with the following code snippets.

    1. A ViewModel for the TreeView

    public class TreeViewModelView
{
    public IEnumerable Values
    {
        get { /* return hierarchical data source here ... */ }
    }

    /// 
    /// Command executed when the TreeViewItem expanding event is raised. The data item is passed in as a parameter.
    /// 
    public RelayCommand ExpandedCommand
    {
        get { return new RelayCommand( o => MessageBox.Show( o.GetType().Name ) ); }
    }

    /// 
    /// Command executed when the TreeViewItem collapsing event is raised.
    /// 
    public RelayCommand CollapsedCommand
    {
        get { return new RelayCommand( () => MessageBox.Show( "Collapsed" ) ); }
    }

}



    2. Define the TreeView and setup the required data binding:
    


     
    
        

        
            
                
            
        
    


    


    3. In Expression Blend you can create edit a copy of the ItemContainerStyle template 
    


    

    


    4. Then replace the ToggleButton with:
    


    

    
        
        
            
        
        
        
            
        
    



    
    
    
             
    
                                                        
    
            
            
    
              
                
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