基础之“CheckboxTreeViewer的使用”

1.创建方式

   viewer = new CheckboxTreeViewer(container/*, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER*/);
   viewer.setContentProvider(new ViewContentProvider());//实现IStructuredContentProvider,ITreeContentProvider 
   viewer.setLabelProvider(new ViewLabelProvider());//extends LabelProvider
   viewer.setInput(dataList);

2.事件

   viewer.getTree().addSelectionListener(new TreeSelectionListener());//extends SelectionAdapter  右键菜单
   viewer.getControl().setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true)); 
   viewer.addDoubleClickListener(new IDoubleClickListener(){});//双击事件
   viewer.addCheckStateListener(new TreeCheckStateListener());//implements ICheckStateListener 父子极联选中

3.事件详情

   a.TreeCheckStateListener
        Object obj = event.getElement();

	if (!(obj instanceof TreeObject)) {
		return;
	}
	TreeObject element = (TreeObject) obj;
	boolean check = viewer.getChecked(obj); 
	switch(element.getLevel()){}
	常用方法：viewer.getChecked(Objectxxx)
	         viewer.expandToLevel(parentElement, 2);
	         viewer.setChecked(child, check);
  b.TreeSelectionListener
	TreeItem item = (TreeItem) e.item;
	if (item == null) {
		return;
	}

	Object obj = item.getData();	
	
	MenuManager menuManager = new MenuManager();
	
	if(!(obj instanceof TreeObject)){
		return ;
	}
	
	TreeObject treeObj = (TreeObject)obj;
	if(2 == treeObj.getLevel()){
		menuManager.add(deleteAction);
	}else if(1 == treeObj.getLevel()){
		menuManager.add(newAction);
		menuManager.add(deleteAction);
	}else{
		return ;
	}
	 
	Menu menu = menuManager.createContextMenu(viewer.getControl());
	viewer.getControl().setMenu(menu);	
c.IDoubleClickListener
        IStructuredSelection selection = (IStructuredSelection)viewer.getSelection();
	if (selection == null){
		return null;
	}
	Object obj = selection.getFirstElement();
	TreeObject element = null;
	if (obj instanceof TreeObject){
		element = (TreeObject)obj;
	} 	
	//next open xxx handle