userviewpanel.java

该系统是一个基于p2p的即时聊天系统

/*
 * @(#) UserViewPanel.java
 * Copyright 2004 HWStudio. All rights reserved.
 */
package hws.item.smart.panel.function.admin.misc;
//导入核心Java类库
import java.awt.Insets;
import java.awt.Component;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.event.MouseListener;
import java.util.List;
import javax.swing.JTree;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.tree.TreePath;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.DefaultTreeSelectionModel;
import javax.swing.event.TreeSelectionListener;
//导入自定义Java类库
import hws.item.smart.misc.ImageShop;
import hws.item.smart.utility.chat.UserInfo;
import hws.item.smart.utility.admin.XMLAccessor;
/**
 * 用户服务面板
 *
 * @version 0.1 2005-08-30
 * @author Hwerz
 */
public class UserViewPanel extends JPanel {
    /*------------------------------------------------------------------------*
     *                                属性定义                                *
     *------------------------------------------------------------------------*/
    /**
     * 用户树的根节点
     */
    private DefaultMutableTreeNode root;
    /**
     * 用户树的视图
     */
    private JTree userTree;
    /**
     * 用户树的模型
     */
    private DefaultTreeModel userModel;
    /*------------------------------------------------------------------------*
     *                                构造函数                                *
     *------------------------------------------------------------------------*/
    /**
     * Create a new instance of this class
     */
    public UserViewPanel() {
        super(new GridBagLayout());
        //用户视图标签
        GridBagConstraints constraints = new GridBagConstraints(
            //gridx, gridy
            0, 0,
            //gridwidth, gridheight
            1, 1,
            //weightx, weighty
            0.0, 0.0,
            //anchor
            GridBagConstraints.NORTHWEST,
            //fill
            GridBagConstraints.NONE,
            //insets
            new Insets(0, 5, 0, 0),
            //ipadx, ipady
            0, 0);
        add(new JLabel("用户视图"), constraints);
        //树型组件
        root = new DefaultMutableTreeNode("系统用户");
        userModel = new DefaultTreeModel(root);
        userTree = new JTree(userModel);
        loadUsers();
        setTree();
        setTreeCellRenderer();
        JScrollPane scroller = new JScrollPane(userTree,
            JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
            JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
        constraints.gridy = 1;
        constraints.weightx = 1.0;
        constraints.weighty = 1.0;
        constraints.fill = GridBagConstraints.BOTH;
        constraints.insets = new Insets(0, 0, 0, 0);
        add(scroller, constraints);
    }
    /*------------------------------------------------------------------------*
     *                                公共方法                                *
     *------------------------------------------------------------------------*/
    /**
     * 重载用户
     */
    public void reloadUsers() {
        unloadUsers();
        loadUsers();
    }
    /**
     * 返回用户树的根节点
     *
     * @return 用户树的根节点
     */
    public DefaultMutableTreeNode getRootNode() {
        return root;
    }
    /**
     * 删除选中的用户
     */
    public void deleteSelectedUser() {
        TreePath path = userTree.getSelectionPath();
        if (path != null) {
            DefaultMutableTreeNode node = (DefaultMutableTreeNode) path
                .getLastPathComponent();
            if (node.isLeaf()) {
                int row = userTree.getRowForPath(path);
                userModel.removeNodeFromParent(node);
                userTree.setSelectionRow(row - 1);
                XMLAccessor.deleteUser(node.toString(), true);
            }
        }
    }
    /*------------------------------------------------------------------------*
     *                                保护方法                                *
     *------------------------------------------------------------------------*/
    /**
     * 添加TreeSelectionListener
     *
     * @param listener 待添加的TreeSelectionListener
     */
    protected void addTreeSelectionListener(TreeSelectionListener listener) {
        userTree.addTreeSelectionListener(listener);
    }
    /**
     * 添加MouseListener
     *
     * @param listener 待添加的MouseListener
     */
    protected void addMouseListener2(MouseListener listener) {
        userTree.addMouseListener(listener);
    }
    /*------------------------------------------------------------------------*
     *                                私有方法                                *
     *------------------------------------------------------------------------*/
    /**
     * 装载用户
     */
    private void loadUsers() {
        List users = XMLAccessor.getAllUsers();
        for (int i = 0; i < users.size(); i++) {
            UserInfo info = (UserInfo) users.get(i);
            DefaultMutableTreeNode child = new DefaultMutableTreeNode(info);
            userModel.insertNodeInto(child, root, i);
        }
        userTree.expandRow(0);
        userTree.setSelectionRow(0);
    }
    /**
     * 卸载用户
     */
    private void unloadUsers() {
        int count = root.getChildCount();
        for (int i = 0; i < count; i++) {
            userModel.removeNodeFromParent(
                (DefaultMutableTreeNode) root.getChildAt(0));
        }
    }
    /**
     * 设置树型组件的附加选项
     */
    private void setTree() {
        DefaultTreeSelectionModel model = new DefaultTreeSelectionModel();
        model.setSelectionMode(model.SINGLE_TREE_SELECTION);
        userTree.setSelectionModel(model);
        userTree.setSelectionRow(0);
        userTree.expandRow(0);
    }
    /**
     * 设置树型组件的单元格渲染器
     */
    private void setTreeCellRenderer() {
        final DefaultTreeCellRenderer renderer1 =
            (DefaultTreeCellRenderer) userTree.getCellRenderer();
        DefaultTreeCellRenderer renderer2 = new DefaultTreeCellRenderer() {
            public Component getTreeCellRendererComponent(JTree tree,
                Object value, boolean selected, boolean expanded,
                boolean leaf, int row, boolean hasFocus) {
                Component c = renderer1.getTreeCellRendererComponent(tree,
                    value, selected, expanded, leaf, row, hasFocus);
                JLabel label = (JLabel) c;
                if (value == root) {
                    label.setIcon(ImageShop.USER_ROOT_IMAGEICON);
                } else {
                    label.setIcon(ImageShop.USER_IMAGEICON);
                }
                return c;
            }
        };
        userTree.setCellRenderer(renderer2);
    }
}