【转】使用JInternalFrame实现MDI_JAVA_编程开发_程序员俱乐部

使用JInternalFrame实现MDI 2008-08-13 15:20:42 标签：Java?MDI?GPF?JInternalFrame 原创作品，允许转载，转载时请务必以超链接形式标明文章?原始出处?、作者信息和本声明。否则将追究法律责任。http://devbean.blog.51cto.com/448512/92426 声明：本文章中介绍的内容可以在GPF项目中找到相应的实现。 ? GPF计划使用MDI的处理模式，Java的JDesktopPane和JInternalFrame已经为我们实现了这样的功能。但是，在将JInternalFrame最大化的时候，JDesktopPane和我们熟知的其他软件，如Word等，具有不同的处理方式。此时可以通过这里介绍的内容弥补这一缺点，使Swing的程序更类似于本地实现。 ? 首先先看一下怎么使用JDesktopPane和JInternalFrame实现MDI。其实实现的方式很简单，就是在一个窗口中添加JDesktopPane，然后使用JDesktopPane的add方法，添加JInternalFrame的实例即可。具体的代码片段如下所示： ? //...?
final?JDesktopPane desktopPane =?new?JDesktopPane();?
//...?
Container content = getContentPane();?
content.add(desktopPane, BorderLayout.CENTER);?
//...?
InnerFrame iFrame =?new?InnerFrame();?
iFrame.setVisible(true);?
desktopPane.add(iFrame);?
//... ? 由此即可按照Java提供的方式添加MDI的实现。我们可以看到它的运行截图如下所示： ? ? 可以看到，当JInternalFrame最大化的时候，仅仅是充满了整个JDesktopPane，并不会像一般的MDI程序一样，将最大化最小化的按钮显示在菜单栏。这是因为JInternalFrame是一个轻量级组件，必须依附在容器之中，因此它的大小不可能超出JDesktopPane。为了获得我们想要的效果，我们对JInternalFrame的UI进行改写： ? class?InnerFrame?extends?JInternalFrame {?
???
??/** The is hidden. */?
??boolean?isHidden =?false;?
???
??/** The old ui. */?
??BasicInternalFrameUI oldUi =?null;?
???
??/**?
?? * Instantiates a new inner frame.?
?? */?
??public?InnerFrame() {?
??????oldUi = (BasicInternalFrameUI)getUI();?
??????setSize(200, 200);?
??????maximizable =?true;?
??????closable =?true;?
??????addComponentListener(new?ComponentAdapter() {?
?????????public?void?componentResized(ComponentEvent e) {?
??????????? InnerFrame selectedFrame = (InnerFrame)e.getSource();?
????????????if(selectedFrame.isMaximum()){?
????????????? selectedFrame.hideNorthPanel();?
????????????? opPane.setVisible(true);?
??????????????try?{?
??????????????? ?selectedFrame.setMaximum(true);?
????????????? }?catch?(PropertyVetoException ex) {?
???????????? ??? ex.printStackTrace();?
??????????? ? }?
??????? ??}?
????? }?
?? ?});?
??}?
???
??/**?
?? * Hide north panel.?
?? */?
??public?void?hideNorthPanel(){?
??????((BasicInternalFrameUI)?this.getUI()).setNorthPane(null);?
??????this.putClientProperty("JInternalFrame.isPalette", Boolean.TRUE);?
??????isHidden =?true;?
??}?
???
??/**?
?? * Show north panel.?
?? */?
??public?void?showNorthPanel() {?
??????this.setUI(oldUi);?
??????this.putClientProperty("JInternalFrame.isPalette", Boolean.FALSE);?
??????isHidden =?false;?
??}?
???
??/* (non-Javadoc)?
?? * @see javax.swing.JInternalFrame#updateUI()?
?? */?
??public?void?updateUI() {?
??????super.updateUI();?
??????if?(isHidden) {?
??????? hideNorthPanel();?
??????}?
??}? } ? InnerFrame类继承自JInternalFrame，由于JInternalFrame没有对于窗口最大化事件的监听。所以，我们把它添加了一个ComponentListener。当组件大小改变时，调用componentResized方法，然后在这里判断如果组件大小是isMaximum()的，则将NorthPane隐藏掉。这里的JInternalFrame的NorthPane就是绘有关闭按钮的那一条面板。由于定义了hideNorthPane()和showNorthPane()这两个方法，是得我们对于InnerFrame的控制加强了。 ? 修改后的完整代码如下所示： ? import?java.awt.BorderLayout;?
import?java.awt.Container;?
import?java.awt.Dimension;?
import?java.awt.FlowLayout;?
import?java.awt.Insets;?
import?java.awt.event.ActionEvent;?
import?java.awt.event.ActionListener;?
import?java.awt.event.ComponentAdapter;?
import?java.awt.event.ComponentEvent;?
import?java.beans.PropertyVetoException;?

import?javax.swing.JButton;?
import?javax.swing.JDesktopPane;?
import?javax.swing.JFrame;?
import?javax.swing.JInternalFrame;?
import?javax.swing.JMenuBar;?
import?javax.swing.JMenuItem;?
import?javax.swing.JPanel;?
import?javax.swing.SwingUtilities;?
import?javax.swing.plaf.basic.BasicInternalFrameUI;?

/**?
* MDIFrame is a frame using JInternalFrame to implements MDI as Word on Windows.?
*??
* @author Cheng?
* @version 1.0.0 for GPF MDI test?
*/?
@SuppressWarnings("serial")?
public?class?MDIFrame?extends?JFrame {?
??
????/** The desktop pane. */?
????final?JDesktopPane desktopPane =?new?JDesktopPane();?
??
????/** The operation pane with restore and close buttons. */?
????final?JPanel opPane =?new?JPanel();?
??
????/**?
?????* Instantiates a new mDI frame.?
???? */?
????public?MDIFrame(){?
????? setTitle("MDI Frame");?
????? setSize(600, 550);?
????? setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);?
???
??????final?JMenuBar bar =?new?JMenuBar();?
????? JMenuItem exit =?new?JMenuItem("Exit");?
????????? exit.addActionListener(new?ActionListener(){?

???????????? ?@Override?
???????????? ?public?void?actionPerformed(ActionEvent e) {?
?????????????????? System.exit(0);?
????????????? }?
????
??????});?
????? bar.add(exit);?
??????// operation pane with two button, set invisible at first?
????? opPane.setLayout(new?FlowLayout(FlowLayout.TRAILING));?
????? JButton restore =?new?JButton("#");?
????? restore.setMargin(new?Insets(0, 0, 0, 0));?
????? restore.setPreferredSize(new?Dimension(15, 15));?
????? restore.addActionListener(new?ActionListener(){?

??????@Override?
??????public?void?actionPerformed(ActionEvent e) {?
????????????InnerFrame i = (InnerFrame)desktopPane.getSelectedFrame();?
???????? ???try?{?
????????? ??????// notice this method, when JInternalFrame set maximun false
????????? ???? ?// this internal frame will be set as old size?
????????? ???? ?i.setMaximum(false);?
?????? ???? }?catch?(PropertyVetoException ex) {?
???????? ????? ?ex.printStackTrace();?
??????? ?? ?}?
???????? ?? i.showNorthPanel();?
?????????? ?opPane.setVisible(false);?
??????? ??}?
????
???? ?});?
???? ?opPane.add(restore);?
????? JButton close =?new?JButton("X");?
????? close.setMargin(new?Insets(0, 0, 0, 0));?
????? close.setPreferredSize(new?Dimension(15, 15));?
???? ?close.addActionListener(new?ActionListener(){?

???????? ?@Override?
?????? ???public?void?actionPerformed(ActionEvent e) {?
????????? ??JInternalFrame i = desktopPane.getSelectedFrame();?
????????? ??i.dispose();?
???????? ? ?opPane.setVisible(false);?
??????? ??}?
????
????? });?
???? ?opPane.add(close);?
????? bar.add(opPane);?
????? opPane.setVisible(false);?
???? ?setJMenuBar(bar);?
???
????? Container content = getContentPane();?
???? ?content.add(desktopPane, BorderLayout.CENTER);?
??? ??final?JPanel ctrlPane =?new?JPanel();?
??????JButton add =?new?JButton("add");?
???? ?add.addActionListener(new?ActionListener(){?

???????? ?@Override?
???????? ?public?void?actionPerformed(ActionEvent e) {?
???????????? ?InnerFrame iFrame =?new?InnerFrame();?
?????????? ???iFrame.setVisible(true);?
???????????? ?desktopPane.add(iFrame);?
??????? ??}?
????
????? });?
???? ?ctrlPane.add(add);?
????? content.add(ctrlPane, BorderLayout.SOUTH);?
???? ?setVisible(true);?
????}?
??
????/**?
?????* The Class InnerFrame.?
???? */?
????class?InnerFrame?extends?JInternalFrame {?
???
???? ?/** The is hidden. */?
???? ?boolean?isHidden =?false;?
???
??????/** The old ui. */?
????? BasicInternalFrameUI oldUi =?null;?
???
???? ?/**?
????? ?* Instantiates a new inner frame.?
?????? */?
??????public?InnerFrame() {?
??????? ??oldUi = (BasicInternalFrameUI)getUI();?
?????? ???setSize(200, 200);?
?????? ???maximizable =?true;?
??????? ??closable =?true;?
???? ?????addComponentListener(new?ComponentAdapter() {?
??????????? ??public?void?componentResized(ComponentEvent e) {?
????????????? ????InnerFrame selectedFrame = (InnerFrame)e.getSource();?
??????????????? ??if(selectedFrame.isMaximum()){?
??????????????????? ??selectedFrame.hideNorthPanel();?
??????????????????? ??opPane.setVisible(true);?
??????????????????? ??try?{?
???????????????????? ???? ?selectedFrame.setMaximum(true);?
???????????????????? ?}?catch?(PropertyVetoException ex) {?
???????????????????????? ? ex.printStackTrace();?
??????????????? ?????? }?
????????????????? ?}?
?????????????? }?
???????? ?});?
???? ?}?
???
??????/**?
????? ?* Hide north panel.?
?????? */?
??????public?void?hideNorthPanel(){?
????????? ((BasicInternalFrameUI)?this.getUI()).setNorthPane(null);?
???????? ?this.putClientProperty("JInternalFrame.isPalette", Boolean.TRUE);?
????????? isHidden =?true;?
????? }?
???
???? ?/**?
???? ? * Show north panel.?
????? ?*/?
??????public?void?showNorthPanel() {?
??????????this.setUI(oldUi);?
???????? ?this.putClientProperty("JInternalFrame.isPalette", Boolean.FALSE);?
????????? isHidden =?false;?
????? }?
???
??????/* (non-Javadoc)?
?????? * @see javax.swing.JInternalFrame#updateUI()?
?????? */?
??????public?void?updateUI() {?
??????????super.updateUI();?
???????? ?if?(isHidden) {?
????????? ????hideNorthPanel();?
?????? ?? }?
????? ?}?
????}?
??
????/**?
?????* The main method.?
??? ?*??
?????* @param args the arguments?
???? */?
????public?static?void?main(String[] args) {?
????????? SwingUtilities.invokeLater(new?Runnable(){?

???????????? ?@Override?
??????????? ??public?void?run() {?
???????????????????new?MDIFrame();?
??????????????}?
????
??????????});?
?????}?
}?
? 修改之后的最大化可以是如图样子： ? ? 当然，按钮之类的很难看，不过修改那个的话就是很容易的了，在这里不再赘述。 ? 本程序代码在Java 6 下编译通过。由于Java文件不允许上传，所以将后缀名改为txt，编译时请将文件名改为MDIFrame.java即可。

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