TreeViewer双击展开树的孩子结点

TreeViewer viewer;

//下面在run()方法中双击结点可以展开其孩子结点

public void run(){

//这里获取当前选中的结点

ISelection selection = viewer.getSelection();

Object obj = ((IStructuredSelection) selection).getFirstElement();

try {
TreeParent element = (TreeParent) obj;
// 处理展开/收缩子菜单
if (element.hasChildren()) {
// 获取孩子结点的展开状态

if (viewer.getExpandedState(element))

viewer.collapseToLevel(element, 1);//这里的参数1代表展开/关闭到哪一层

else
viewer.expandToLevel(element, 1);
}
} catch (ClassCastException e) {

}

}