用JAVA SWING实现简单的折叠组件伸缩功能（不使用JLayeredPane）

实现界面折叠伸缩功能。代码如下：

import java.awt.*;
import javax.swing.*;
import java.util.*;
import java.awt.event.*;/*** <P>Title:OpenSwing </P>* <P>Description: JGroupPanel 组群面板* 类似QQ界面的组群管理面板* </P>* 履历:* 2004/07/24   由SunKing作成* <P>Copyright: Copyright (c) 2004</P>* <P>Company: </P>** @author <A href="mailto:sunkingxie@hotmail.com" mce_href="mailto:sunkingxie@hotmail.com" ?>Sunking</A>* @version 1.0** 不使用JLayeredPane组件实现折叠功能。**/
public class JGroupPanel extends JPanel {/*用来管理组的三个容器*/private JPanel pNorth = new JPanel() {};private JPanel pCenter = new JPanel();private JPanel pSouth = new JPanel();/*当前全部组的集合*/private ArrayList groupList = new ArrayList();/*是否已禁止添加组件*/private boolean forbidFlag = false;/*当前激活的组*/private JGroupContainer activeGroup = null;transient ActionListener al = new ActionListener() {public void actionPerformed(ActionEvent e) {JButton bttTitle = (JButton) e.getSource();expandGroup((JGroupContainer) bttTitle.getParent());}};private boolean hasCreateDefaultGroup = false;public JGroupPanel() {initComponents();createDefaultGroup();}private void initComponents() {this.setLayout(new BorderLayout());this.add(pNorth, BorderLayout.NORTH);this.add(pCenter, BorderLayout.CENTER);this.add(pSouth, BorderLayout.SOUTH);pNorth.setLayout(new GroupLayout());pCenter.setLayout(new BorderLayout());pSouth.setLayout(new GroupLayout());forbidFlag = true;}private void createDefaultGroup() {//Default GroupColor bg[] = { Color.black, Color.red, Color.orange, Color.yellow, Color.green,Color.cyan, Color.blue, Color.white};for (int i = 1; i <= bg.length; i++) {insertGroup(i - 1, "Group " + i, bg[i - 1]);//隐藏和显示的5个按钮for (int j = 1; j <= 5; j++) {JButton bttMember = new JButton("Member " + j + " of " + i);addMember(i - 1, bttMember);bttMember.setPreferredSize(new Dimension(1, 40));bttMember.setOpaque(false);bttMember.setForeground(bg[i - 1]);}getGroup(i - 1).setMemberGap(20, 5);getGroup(i - 1).getTitleButton().setForeground(bg[i - 1]);}//默认张开第一组expandGroup(0);hasCreateDefaultGroup = true;}/*** @param groupNames String[] 预设组名*/public JGroupPanel(String groupNames[]) {initComponents();addGroup(groupNames);}/*** 展开组** @param name String 组名*/public void expandGroup(String name) {for (int i = getGroupCount() - 1; i >= 0; i--) {if (getGroupName(i).equals(name)) {expandGroup(i);}}}/*** 展开组** @param index int 组的顺序号*/public void expandGroup(int index) {expandGroup(getGroup(index));}/*** 展开组** @param group JGroupContainer 组*/protected void expandGroup(JGroupContainer group) {pNorth.removeAll();pCenter.removeAll();pSouth.removeAll();boolean hasAddCenter = false;for (int i = 0; i < groupList.size(); i++) {Component c = (Component) groupList.get(i);if (hasAddCenter) {pSouth.add(c);} else if (c == group) {pCenter.add(c, BorderLayout.CENTER);hasAddCenter = true;} else {pNorth.add(c);}}if (activeGroup != null) {activeGroup.collapse();}activeGroup = group;//激活组展开activeGroup.expand();//使此容器布置其组件。 大多数程序不应该直接调用此方法，而应调用validate方法。pNorth.doLayout();pCenter.doLayout();pSouth.doLayout();doLayout();//        pNorth.validate();
//        pCenter.validate();
//        pSouth.validate();
//        validate();}/*** 收缩组** @param name String 组名*/public void collapseGroup(String name) {for (int i = getGroupCount() - 1; i >= 0; i--) {if (getGroupName(i).equals(name)) {collapseGroup(i);}}}/*** 收缩组** @param index int 组的顺序号*/public void collapseGroup(int index) {collapseGroup(getGroup(index));}/*** 收缩组** @param group JGroupContainer 组*/protected void collapseGroup(JGroupContainer group) {if (group == activeGroup) {activeGroup.collapse();activeGroup = null;}}/*** 添加组** @param name String 组名*/public void addGroup(String name) {this.insertGroup(getGroupCount(), name);}/*** 添加多个组** @param names String[] 组名*/public void addGroup(String names[]) {for (int i = 0; i < names.length; i++) {addGroup(names[i]);}}/*** 插入一个组** @param index int 顺序号* @param name  String 组名* @param bg    Color 背景色*/public void insertGroup(int index, String name, Color bg) {if (index < 0 || index > groupList.size()) {throw new ArrayIndexOutOfBoundsException("index:" + index +" >count:" + groupList.size());}if (hasCreateDefaultGroup) {while (getGroupCount() > 0) {removeGroup(0);}hasCreateDefaultGroup = false;}int countNorth = pNorth.getComponentCount();int countCenter = pCenter.getComponentCount();int countSouth = pSouth.getComponentCount();JGroupContainer group;if (index <= countNorth) {group = insertGroup(pNorth, index, name, bg);} else if (index <= countNorth + countCenter) {group = insertGroup(pCenter, index - countNorth, name, bg);} else if (index <= countNorth + countCenter + countSouth) {group = insertGroup(pSouth, index - countNorth - countCenter, name,bg);} else {group = insertGroup(pSouth, countSouth, name, bg);}group.getTitleButton().addActionListener(al);groupList.add(index, group);}/*** 插入一个组** @param index int 顺序号* @param name  String 组名*/public void insertGroup(int index, String name) {insertGroup(index, name, UIManager.getColor("Desktop.background"));}/*** 插入一个组** @param p     JPanel 目标面板* @param index int 顺序号* @param name  String 组名*              <p>*              <p>*              /***              插入一个组* @param p     JPanel 目标面板* @param index int 顺序号* @param name  String 组名* @return JGroupContainer*/private JGroupContainer insertGroup(JPanel p, int index, String name,Color bg) {JGroupContainer group = new JGroupContainer(name, bg);p.add(group);return group;}/*** 删除一个组** @param index int 顺序号*/public void removeGroup(int index) {JGroupContainer c = (JGroupContainer) groupList.get(index);c.getParent().remove(c);c.getTitleButton().removeActionListener(al);}/*** 删除一个组** @param name String 组名*/public void removeGroup(String name) {for (int i = getGroupCount() - 1; i >= 0; i--) {if (getGroupName(i).equals(name)) {this.removeGroup(i);}}}/*** 设置组名** @param index int 顺序号* @param name  String 组名*/public void setGroupName(int index, String name) {this.getGroup(index).setName(name);}/*** 取得组名** @param groupIndex int 顺序号* @return String 组名*/public String getGroupName(int groupIndex) {return getGroup(groupIndex).getName();}/*** 取得全部组名** @return String[]*/public String[] getGroupNames() {String sResult[] = new String[getGroupCount()];for (int i = 0; i < getGroupCount(); i++) {sResult[i] = getGroupName(i);}return sResult;}/*** 取得当前组的总数** @return int*/public int getGroupCount() {return groupList.size();}/*** 往组中添加成员组件** @param groupIndex int 组的顺序号* @param member     Component 成员组件*/public void addMember(int groupIndex, Component member) {getGroup(groupIndex).addMember(getGroup(groupIndex).getMemberCount(),member);}/*** 往组中插入成员组件** @param groupIndex  int 组的顺序号* @param memberIndex int 插入的顺序号* @param member      Component 成员组件*/public void insertMember(int groupIndex, int memberIndex, Component member) {getGroup(groupIndex).addMember(memberIndex, member);}/*** 从组中移除成员组件** @param groupIndex  int* @param memberIndex int*/public void removeMember(int groupIndex, int memberIndex) {getGroup(groupIndex).removeMember(memberIndex);}/*** 取得成员组件** @param groupIndex  int 组的顺序号* @param memberIndex int 成员组件的顺序号* @return Component 成员组件*/public Component getMember(int groupIndex, int memberIndex) {return getGroup(groupIndex).getMember(memberIndex);}/*** 取得全部成员组件** @param groupIndex int 组的顺序号* @return Component[] 全部成员组件*/public Component[] getMembers(int groupIndex) {return getGroup(groupIndex).getMembers();}/*** 取得成员组件的总数** @param groupIndex int 组的顺序号* @return int 总数*/public int getMemberCount(int groupIndex) {return getGroup(groupIndex).getMemberCount();}/*** 取得组** @param index int 组的顺序号* @return JGroupContainer 组*/protected JGroupContainer getGroup(int index) {return (JGroupContainer) groupList.get(index);}/*** 覆写的addImpl方法,禁止再向JGroupPane中添加组件** @param comp        Component* @param constraints Object* @param index       int*/protected void addImpl(Component comp, Object constraints, int index) {if (forbidFlag) {if (!(comp instanceof JGroupContainer)) {throw new UnsupportedOperationException("JGroupPane can't add component!");}} else {super.addImpl(comp, constraints, index);}}/*** <P>Title: OpenSwing</P>* <P>Description: 组面板布局管理器</P>* <P>Copyright: Copyright (c) 2004</P>* <P>Company: </P>** @author <A href="mailto:sunkingxie@hotmail.com" mce_href="mailto:sunkingxie@hotmail.com">SunKing</A>* @version 1.0*/class GroupLayoutimplements LayoutManager, java.io.Serializable {int vgap = 0;int hgap = 0;public GroupLayout() {}public GroupLayout(int hg, int vg) {this.hgap = hg;this.vgap = vg;}public void addLayoutComponent(String name, Component comp) {}public void removeLayoutComponent(Component comp) {}public Dimension preferredLayoutSize(Container parent) {synchronized (parent.getTreeLock()) {Insets insets = parent.getInsets();int ncomponents = parent.getComponentCount();int w = 0;int h = 0;for (int i = 0; i < ncomponents; i++) {Component comp = parent.getComponent(i);Dimension d = comp.getPreferredSize();if (w < d.width) {w = d.width;}h += d.height + vgap;}return new Dimension(insets.left + insets.right + w + 2 * hgap,insets.top + insets.bottom + h + 2 * vgap);}}public Dimension minimumLayoutSize(Container parent) {return preferredLayoutSize(parent);}public void layoutContainer(Container parent) {synchronized (parent.getTreeLock()) {Insets insets = parent.getInsets();int ncomponents = parent.getComponentCount();if (ncomponents == 0) {return;}int y = insets.top + vgap;for (int c = 0; c < ncomponents; c++) {int h = parent.getComponent(c).getPreferredSize().height;parent.getComponent(c).setBounds(insets.left + hgap,y,parent.getWidth() - insets.left - insets.right -2 * hgap, h);y += h + vgap;}}}public String toString() {return getClass().getName();}}/*** <P>Title: OpenSwing</P>* <P>Description: 组</P>* <P>Copyright: Copyright (c) 2004</P>* <P>Company: </P>** @author <A href="mailto:sunkingxie@hotmail.com" mce_href="mailto:sunkingxie@hotmail.com">SunKing</A>* @version 1.0*/class JGroupContainerextends JPanel {/*** 按钮*/private JButton bttGroupTitle = new JButton();//存放按钮Membersprivate JPanel pMembers = new JPanel();private JScrollPane sp;public JGroupContainer() {this("");}public JGroupContainer(String name) {this(name, UIManager.getColor("Desktop.background"));}/*** @param name       String  组名* @param background Color 成员组件所在面板背景色*/public JGroupContainer(String name, Color background) {bttGroupTitle.setText(name);bttGroupTitle.setFocusable(false);pMembers.setLayout(new GroupLayout(5, 5));this.setLayout(new BorderLayout());this.add(bttGroupTitle, BorderLayout.NORTH);pMembers.setBackground(background);sp = new JScrollPane(pMembers);//设置不显示水平滚动条sp.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);this.add(sp, BorderLayout.CENTER);collapse();}/*** 设置间距 （设置隐藏的按钮各自的间距）** @param hgap int 横间距* @param vgap int 竖间距*/public void setMemberGap(int hgap, int vgap) {pMembers.setLayout(new GroupLayout(hgap, vgap));}/*** 取得组的标题按钮** @return JButton*/public JButton getTitleButton() {return bttGroupTitle;}/*** 取得组的成员组件面板** @return JPanel*/public JPanel getMembersContainer() {return pMembers;}/*** 收缩组*/public void collapse() {sp.setVisible(false);//支持延迟自动布局。当属性值更改时，此组件将自动调用此方法this.revalidate();}/*** 展开组*/public void expand() {sp.setVisible(true);//支持延迟自动布局。当属性值更改时，此组件将自动调用此方法this.revalidate();}/*** 设置组名** @param name String 组名*/public void setName(String name) {bttGroupTitle.setText(name);}/*** 取得组名** @return String*/public String getName() {return bttGroupTitle.getText();}/*** 添加一个成员组件** @param index int 顺序号* @param c     Component 成员组件*/public void addMember(int index, Component c) {pMembers.add(c, index);pMembers.doLayout();}/*** 删除一个成员组件** @param index int 顺序号*/public void removeMember(int index) {pMembers.remove(index);pMembers.doLayout();}/*** 取得一个成员组件** @param index int 顺序号* @return Component 成员组件*/public Component getMember(int index) {return pMembers.getComponent(index);}/*** 取得全部成员组件** @return Component[] 成员组件*/public Component[] getMembers() {Component coms[] = new Component[getMemberCount()];for (int i = 0; i < coms.length; i++) {coms[i] = pMembers.getComponent(i);}return coms;}/*** 取得成员组件总数** @return int 总数*/public int getMemberCount() {return pMembers.getComponentCount();}/*** 重写的toString方法** @return String*/public String toString() {return getName();}}/*** /*** 测试程序** @param args String[]*/public static void main(String[] args) {JFrame frame = new JFrame();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setTitle("JGroupPanel Demo");frame.getContentPane().setLayout(new BorderLayout());JGroupPanel p = new JGroupPanel();frame.getContentPane().add(p, BorderLayout.CENTER);frame.setBounds(300, 300, 500, 600);frame.setVisible(true);}}

效果图如下：

本文参考的是 JAVA--好友界面面板__夜风的博客-CSDN博客

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