基础之“CheckboxTreeViewer的使用”

最新推荐文章于 2018-05-17 15:45:00 发布

最新推荐文章于 2018-05-17 15:45:00 发布 · 473 阅读

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本文详细介绍了 SWT 中 CheckboxTreeViewer 的创建方法及其事件监听的实现过程，包括选择监听、双击监听及检查状态监听等，并展示了如何通过具体方法控制树节点的状态。

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