filepanel.java

该系统是一个基于p2p的即时聊天系统

            loadFiles();
            setTreeCellRenderer();
            setTree(fileTree);
            JScrollPane scroller = new JScrollPane(fileTree,
                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);
        }
        /**
         * 设置树型组件的单元格渲染器
         */
        private void setTreeCellRenderer() {
            final DefaultTreeCellRenderer renderer1 =
                (DefaultTreeCellRenderer) fileTree.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 == FILE_ROOT) {
                        label.setIcon(ImageShop.SHARE_ROOT_IMAGEICON);
                    } else {
                        int level = ((DefaultMutableTreeNode) value).getLevel();
                        if (level == 1) {
                            label.setIcon(ImageShop.USER_IMAGEICON);
                        } else {
                            label.setIcon(ImageShop.SHARE_IMAGEICON);
                        }
                    }
                    return c;
                }
            };
            fileTree.setCellRenderer(renderer2);
        }
        /**
         * 重载文件
         */
        public void reloadFiles() {
            unloadFiles();
            loadFiles();
        }
        /**
         * 装载文件
         */
        private void loadFiles() {
            List users = XMLAccessor.getAllUsers();
            for (int i = 0; i < users.size(); i++) {
                UserInfo user = (UserInfo) users.get(i);
                DefaultMutableTreeNode child = new DefaultMutableTreeNode(user);
                fileModel.insertNodeInto(child, FILE_ROOT, i);
                List shares = user.getSharesInfo().getAllShares();
                for (int j = 0; j < shares.size(); j++) {
                    ShareInfo share = (ShareInfo) shares.get(j);
                    DefaultMutableTreeNode child2 =
                        new DefaultMutableTreeNode(share.getFile());
                    fileModel.insertNodeInto(child2, child, j);
                }
            }
            fileTree.expandRow(0);
            fileTree.setSelectionRow(0);
        }
        /**
         * 卸载文件
         */
        private void unloadFiles() {
            int count = FILE_ROOT.getChildCount();
            for (int i = 0; i < count; i++) {
                fileModel.removeNodeFromParent(
                    (DefaultMutableTreeNode) FILE_ROOT.getChildAt(0));
            }
        }
        /**
         * 实现TreeSelectionListener接口的方法
         *
         * @param event TreeSelectionEvent对象
         */
        public void valueChanged(TreeSelectionEvent event) {
            DefaultMutableTreeNode node = (DefaultMutableTreeNode) event
                .getPath().getLastPathComponent();
            int level = node.getLevel();
            if (level == 2) {
                friendViewPanel.reloadFriends(
                    node.getParent().toString(), node.toString());
            } else {
                friendViewPanel.reloadFriends(null, null);
            }
        }
    }
    /**
     * 好友视图
     */
    class FriendViewPanel extends JPanel {
        /**
         * 好友树的视图
         */
        private JTree friendTree;
        /**
         * 好友树的模型
         */
        private DefaultTreeModel friendModel;
        /**
         * Create a new instance of this class
         */
        public FriendViewPanel() {
            super(new GridBagLayout());
            //好友视图标签
            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("好友视图"), constraints);
            //树型组件
            friendModel = new DefaultTreeModel(FRIEND_ROOT);
            friendTree = new JTree(friendModel);
            setTreeCellRenderer();
            setTree(friendTree);
            JScrollPane scroller = new JScrollPane(friendTree,
                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);
        }
        /**
         * 重载共享
         *
         * @param id 指定的用户
         * @param file 指定的共享文件
         */
        public void reloadFriends(String id, String file) {
            unloadFriends();
            if (id != null && file != null) {
                loadFriends(id, file);
            }
        }
        /**
         * 装载好友
         *
         * @param id 指定的用户
         * @param file 指定的共享文件
         */
        private void loadFriends(String id, String file) {
            Element shares = XMLAccessor.getSharesElement(id);
            List s = SharesInfo.sharesElement2SharesInfo(shares).getAllShares();
            for (int i = 0; i < s.size(); i++) {
                ShareInfo share = (ShareInfo) s.get(i);
                if (share.getFile().equals(file)) {
                    List f = share.getFriends().getAllFriends();
                    for (int j = 0; j < f.size(); j++) {
                        DefaultMutableTreeNode friend =
                            new DefaultMutableTreeNode(f.get(j));
                        friendModel.insertNodeInto(friend, FRIEND_ROOT, j);
                    }
                }
            }
            friendTree.expandRow(0);
            friendTree.setSelectionRow(0);
        }
        /**
         * 卸载好友
         */
        private void unloadFriends() {
            int count = FRIEND_ROOT.getChildCount();
            for (int i = 0; i < count; i++) {
                friendModel.removeNodeFromParent(
                    (DefaultMutableTreeNode) FRIEND_ROOT.getChildAt(0));
            }
        }
        /**
         * 设置树型组件的单元格渲染器
         */
        private void setTreeCellRenderer() {
            final DefaultTreeCellRenderer renderer1 =
                (DefaultTreeCellRenderer) friendTree.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 == FRIEND_ROOT) {
                        label.setIcon(ImageShop.USER_ROOT_IMAGEICON);
                    } else {
                        label.setIcon(ImageShop.USER_IMAGEICON);
                    }
                    return c;
                }
            };
            friendTree.setCellRenderer(renderer2);
        }
    }
}