寻早JTree高手————在JTree的节点上点右键弹出菜单,解决问题马上给分！在线等
这是源码 需要做的是 右键点击在线好友和不在线的好友的子节点能弹出PopupMenu
有什么问题 马上题
public class FriendTree implements TreeSelectionListener
{
private DefaultTreeModel treemode;
private String nodenameAll;
private DefaultMutableTreeNode root=new DefaultMutableTreeNode( "我的好友 ");
private JTree tree=new JTree(root);
private DefaultMutableTreeNode online ;
private DefaultMutableTreeNode notonline;
private Client client=new Client();
FriendTree(Client client)
{
this.client=client;
}
public JTree chushi()//未加任何好友的情况
{
treemode=(DefaultTreeModel)tree.getModel();//得到DefaultTreeModel
online =new DefaultMutableTreeNode( "在线的好友 ");
notonline =new DefaultMutableTreeNode( "不在线的好友 ");
treemode.insertNodeInto(online , root,0);
treemode.insertNodeInto(notonline ,root,1);
tree.setRowHeight(20);
tree.scrollPathToVisible(new TreePath(notonline.getPath()));
tree.addMouseListener(new MouseListenerimp());
return tree;
}
public JTree onlinefriend(User user,int id)
{
treemode=(DefaultTreeModel)tree.getModel();//得到DefaultTreeModel
for(int i=0;i <user.getFriend().size();i++)
{
user=(User)user.getFriend().elementAt(0);
if(user.getStatus()==0)
{
System.out.println( "tree "+user.getID());//好于的ID
DefaultMutableTreeNode newNode=new DefaultMutableTreeNode(String.valueOf(user.getID()));
treemode.insertNodeInto(newNode , online, i);
tree.scrollPathToVisible(new TreePath(newNode.getPath()));
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);//只能选取一个节点
tree.addMouseListener(new MouseListenerimp());
System.out.println( "dsfasfa ");
}
}
return tree;
}
public void addonlinefriend(int id)
{
treemode=(DefaultTreeModel)tree.getModel();//得到DefaultTreeModel
DefaultMutableTreeNode newNode=new DefaultMutableTreeNode(String.valueOf(id));
treemode.insertNodeInto(newNode , online, 0);
tree.setRowHeight(20);
tree.scrollPathToVisible(new TreePath(newNode.getPath()));
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);//只能选取一个节点
tree.setRowHeight(20);
}
public void addnotonlinefriend(int id)
{
treemode=(DefaultTreeModel)tree.getModel();//得到DefaultTreeModel
DefaultMutableTreeNode newNode=new DefaultMutableTreeNode(String.valueOf(id));
treemode.insertNodeInto(newNode , notonline, notonline.getChildCount());
tree.scrollPathToVisible(new TreePath(newNode.getPath()));
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);//只能选取一个节点
tree.setRowHeight(30);
}
public void liveline(User user,int id)
{
delNode(user,id);//首先在在线的好友节点中 删除离线的那位好友
addNode(id);//再在不在线的好友节点中 添加离线的那位好友
}
public void shangxian(User user,int id)
{
delNode2(user,id);//首先在不在线的好友节点中 删除离线的那位好友
addNode2(id);//再在在线的好友节点中 添加离线的那位好友
}
public void delNode2(User user,int id)//删除节点
{
DefaultMutableTreeNode n=new DefaultMutableTreeNode();
if (notonline.getChildCount() > 0) {//若在线好友大于零
for (Enumeration e=notonline.children(); e.hasMoreElements(); ) {
n = ( DefaultMutableTreeNode)e.nextElement();
System.out.println( "将在好友在不在线列表中删除此好友 "+n.toString());
if(n.toString().equals(String.valueOf(id)))
{
notonline.remove(n);//查找在线的列表中有没有此ID有则删除
treemode.reload();
}
}
}
}
public void delNode(User user,int id)//删除节点
{
DefaultMutableTreeNode n=new DefaultMutableTreeNode();
if (online.getChildCount() > 0) {//若在线好友大于零
for (Enumeration e=online.children(); e.hasMoreElements(); ) {
n = ( DefaultMutableTreeNode)e.nextElement();
System.out.println( "将在在线好友列表中删除此好友 "+n.toString());
if(n.toString().equals(String.valueOf(id)))
{
online.remove(n);//查找在线的列表中有没有此ID有则删除
treemode.reload();
tree.scrollPathToVisible(new TreePath(n.getPath()));
}
}
}
}
public void addNode(int id)
{
treemode=(DefaultTreeModel)tree.getModel();//得到DefaultTreeModel
DefaultMutableTreeNode newNode=new DefaultMutableTreeNode(String.valueOf(id));
treemode.insertNodeInto(newNode , notonline, notonline.getChildCount());
tree.scrollPathToVisible(new TreePath(newNode.getPath()));
}
public void addNode2(int id)
{
treemode=(DefaultTreeModel)tree.getModel();//得到DefaultTreeModel
DefaultMutableTreeNode newNode=new DefaultMutableTreeNode(String.valueOf(id));
treemode.insertNodeInto(newNode , online, online.getChildCount());
tree.scrollPathToVisible(new TreePath(newNode.getPath()));
}
public void valueChanged(TreeSelectionEvent e) {
JTree tree = (JTree) e.getSource();
DefaultMutableTreeNode parentNode=null;
if(tree.getSelectionPath()==null)
{
}else
{
TreePath parentPath=tree.getSelectionPath();//得到选取到的节点的名字
parentNode=(DefaultMutableTreeNode)(parentPath.getLastPathComponent());
nodenameAll=parentNode.toString();
if(nodenameAll== "我的好友 "||nodenameAll== "在线的好友 "||nodenameAll== "不在线的好友 ")
{
System.out.println( "选择了错误的节点 ");
}else
{
}
}
}
class MouseListenerimp extends MouseAdapter
{
public void mousePressed(MouseEvent e) {
int selRow = tree.getRowForLocation(e.getX(), e.getY());
TreePath selPath = tree.getPathForLocation(e.getX(), e.getY());
System.out.println( "选择了第几行 "+selRow);
DefaultMutableTreeNode selct=(DefaultMutableTreeNode)selPath.getLastPathComponent();
// selct
if(e.getClickCount()==2)
{
System.out.println(selct.toString()+ "nodename ");
client.openChatUI(selct.toString());
}
this.mouseReleased(e);
}
// TODO 自动生成方法存根
public void mouseReleased(MouseEvent e) {
// TODO 自动生成方法存根
if(e.isPopupTrigger())
{
System.out.println(e.getComponent().toString());
//得到被右键点击的的节点
PopupMenu popupMenu1 = new PopupMenu();
MenuItem menuItem1 = new MenuItem();
MenuItem menuItem2 = new MenuItem();
MenuItem menuItem3 = new MenuItem();
menuItem1.setLabel( "删除好友 ");
menuItem2.setLabel( "查看信息 ");
menuItem3.setLabel( "聊天 ");
popupMenu1.add(menuItem1);
popupMenu1.add(menuItem2);
popupMenu1.add(menuItem3);
System.out.println( "e.getc "+e.getComponent()+ "孩子 "+tree.getModel().getChildCount(online));
popupMenu1.show(e.getComponent(),e.getX(),e.getY()); ;
}
}
}
public String getNodenameAll() {
return nodenameAll;
}
public void setNodenameAll(String nodenameAll) {
this.nodenameAll = nodenameAll;
}
public DefaultMutableTreeNode getNotonline() {
return notonline;
}
public void setNotonline(DefaultMutableTreeNode notonline) {
this.notonline = notonline;
}
public DefaultMutableTreeNode getOnline() {
return online;
}
public void setOnline(DefaultMutableTreeNode online) {
this.online = online;
}
}
[解决办法]
我调试了一下,PopupMenu popupMenu1 = new PopupMenu();
MenuItem menuItem1 = new MenuItem();
MenuItem menuItem2 = new MenuItem();
MenuItem menuItem3 = new MenuItem();
menuItem1.setLabel( "删除好友 ");
menuItem2.setLabel( "查看信息 ");
menuItem3.setLabel( "聊天 ");
popupMenu1.add(menuItem1);
popupMenu1.add(menuItem2);
popupMenu1.add(menuItem3);
将PopupMenu 改为JPopupMenu, MenuItem 改为JMenuItem ,就对了,可能是awt的包中的内与swing包中的内不匹配吧,具体原因我也不太清楚.
[解决办法]
楼主，送分吧^o^
popupMenu1.show(e.getComponent(),e.getX(),e.getY());
调用这段代码之前必须保证e.getComponent()的组件必须已经add了这个popupMenu1，否则会出现parent is null这个异常。
根据你的代码我觉得有两种解决方案：
1、换成JPopupMenu和JMenuItem，据我测试，swing不存在这个问题；
2、将你的MouseListenerimp构造函数改一下，加上一个参数Component parent，用来传递调用者，然后在事件里生成PopupMenu的时候记得先调用parent.add(popupMenu1);就可以了。
我原来遇到过这种问题，但是不知道原因，只知道解决方法，希望有高手能指点一下^o^
[解决办法]
tree.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
int n = tree.getRowForLocation(e.getX(), e.getY());
if (n < 0)
return;
if (e.getButton() == MouseEvent.BUTTON3) {
tree.setSelectionRow(n);
m_popmenu.show(tree, e.getX(), e.getY());
}
}
});