JFace 的treeViewer的雙擊展開或收縮

treeViewer.addDoubleClickListener(new IDoubleClickListener() {


@Override
public void doubleClick(DoubleClickEvent event) {

    IStructuredSelection is = (IStructuredSelection)event.getSelection();
    Object obj = is.getFirstElement();
    //自定義的節點對象
    Node node = (Node)obj;
    TreeItem[] items = treeViewer.getTree().getSelection();

        if(null == items || items.length == 0){
            return;
        }
        if(items[0].getExpanded()){
            items[0].setExpanded(false);
        }else{

            //從選中的節點處展開
            treeViewer.expandToLevel(node, 1);
        }


}

});</pre>