s15.htm

书籍主要用于做图形界面使用里面后好多

              true, // resizble<br>
              true, // closable<br>
              true, // maximizable<br>
              true); // iconifiable</p>
            <p> public void init() {<br>
              Container contentPane = getContentPane();</p>
            <p> contentPane.add(desktopPane, BorderLayout.CENTER);</p>
            <p> jif.setBounds(50, 50, 300, 200);<br>
              jif.setFrameIcon(new ImageIcon(this.getClass().getResource(&quot;print.gif&quot;)));<br>
              desktopPane.add(jif);<br>
              jif.show();//源添加的一句,原文没有<br>
              }<br>
              }</p>
            <hr size="1" noshade>
            <p>&nbsp;</p>
            <p>&nbsp;</p>
            <p> 15.1.3 AWT兼容</p>
            <p>&nbsp;</p>
            <p align="center"><b>例15-5 一个定制的桌面窗格</b></p>
            <hr noshade size="1">
            import java.awt.*;<br>
            import java.awt.event.*;<br>
            import javax.swing.*;
            <p>public class Test extends JApplet {<br>
              CustomDesktopPane desktopPane = new CustomDesktopPane();<br>
              int frameCount = 1, numFrames = 5, x, y;</p>
            <p> public void init() {<br>
              Container contentPane = getContentPane();</p>
            <p> setJMenuBar(createMenuBar());<br>
              contentPane.add(desktopPane, BorderLayout.CENTER);</p>
            <p> for(int i=0; i &lt; numFrames; ++i) {<br>
              JInternalFrame jif = new JInternalFrame(<br>
              &quot;Internal Frame &quot; + frameCount++, // title<br>
              true, // resizable<br>
              true, // closable<br>
              true, // maximizable<br>
              true); // iconifiable</p>
            <p> x = (int)(Math.random() * 100);<br>
              y = (int)(Math.random() * 100);</p>
            <p> jif.setBounds(x, y, 250, 100);<br>
              desktopPane.putClientProperty(<br>
              &quot;JDesktopPane.dragMode&quot;,<br>
              &quot;outline&quot;);</p>
            <p> desktopPane.add(jif);<br>
              jif.show();//新添加一句,原文没有<br>
              }<br>
              }<br>
              private JMenuBar createMenuBar() {<br>
              JMenuBar menubar = new JMenuBar();<br>
              JMenu windowMenu = new JMenu(&quot;Window&quot;);</p>
            <p> windowMenu.add(new OpenAllAction());<br>
              windowMenu.add(new CloseAllAction());<br>
              windowMenu.add(new CascadeAction());</p>
            <p> menubar.add(windowMenu);<br>
              return menubar;<br>
              }<br>
              class OpenAllAction extends AbstractAction {<br>
              public OpenAllAction() {<br>
              super(&quot;open all&quot;);<br>
              }<br>
              public void actionPerformed(ActionEvent e) {<br>
              desktopPane.openAll();<br>
              }<br>
              }<br>
              class CloseAllAction extends AbstractAction {<br>
              public CloseAllAction() {<br>
              super(&quot;close all&quot;);<br>
              }<br>
              public void actionPerformed(ActionEvent e) {<br>
              desktopPane.closeAll();<br>
              }<br>
              }<br>
              class CascadeAction extends AbstractAction {<br>
              public CascadeAction() {<br>
              super(&quot;cascade&quot;);<br>
              }<br>
              public void actionPerformed(ActionEvent e) {<br>
              desktopPane.cascade();<br>
              }<br>
              }<br>
              }<br>
              class CustomDesktopPane extends JDesktopPane { <br>
              private int xoffset = 20, yoffset = 20, w = 250, h = 350;</p>
            <p> public void closeAll() {<br>
              JInternalFrame[] frames = getAllFrames();</p>
            <p> for(int i=0; i &lt; frames.length; ++i) {<br>
              if(!frames[i].isIcon()) {<br>
              try {<br>
              frames[i].setIcon(true);<br>
              }<br>
              catch(java.beans.PropertyVetoException ex) {<br>
              System.out.println(&quot;iconification vetoed!&quot;);<br>
              }<br>
              }<br>
              }<br>
              }<br>
              public void openAll() {<br>
              JInternalFrame[] frames = getAllFrames();</p>
            <p> for(int i=0; i &lt; frames.length; ++i) {<br>
              if(frames[i].isIcon()) {<br>
              try {<br>
              frames[i].setIcon(false);<br>
              }<br>
              catch(java.beans.PropertyVetoException ex) {<br>
              System.out.println(&quot;restoration vetoed!&quot;);<br>
              }<br>
              }<br>
              }<br>
              }<br>
              public void cascade() {<br>
              JInternalFrame[] frames = getAllFrames();<br>
              int x = 0, y = 0;</p>
            <p> for(int i=0; i &lt; frames.length; ++i) {<br>
              if( ! frames[i].isIcon()) {<br>
              frames[i].setBounds(x,y,w,h);<br>
              x += xoffset;<br>
              y += yoffset;<br>
              }<br>
              }<br>
              }<br>
              }</p>
            <hr size="1" noshade>
            <p> 15.2 JDesktopPane</p>
            <p>&nbsp;</p>
            <p><br>
              15.2.1 JDesktopPane属性</p>
            <p>&nbsp;</p>
            <p>15.2.2 JDesktopPane事件</p>
            <p>&nbsp;</p>
            <p> 15.2.3 JDesktopPane类总结 </p>
            <p>&nbsp;</p>
            <p> 15.2.4 AWT兼容</p>
            <p>&nbsp;</p>
            <p> 15.3 DesktopManager</p>
            <p>&nbsp;</p>
            <p align="center"><b>例15-6 一个定制的DesktopManager</b></p>
            <hr noshade size="1">
            import java.awt.*;<br>
            import java.awt.event.*;<br>
            import javax.swing.*;
            <p>public class Test extends JApplet {<br>
              JDesktopPane desktopPane = new JDesktopPane();</p>
            <p> public void init() {<br>
              Container contentPane = getContentPane();</p>
            <p> contentPane.add(desktopPane, BorderLayout.CENTER);<br>
              desktopPane.setDesktopManager(new OutlineManager());</p>
            <p> JInternalFrame jif = new JInternalFrame(<br>
              &quot;Outline Drag and Resize&quot;, // title<br>
              true, // resizable<br>
              true, // closable<br>
              true, // maximizable<br>
              true); // iconifiable</p>
            <p> jif.setBounds(10, 10, 250, 100);<br>
              desktopPane.add(jif);<br>
              jif.show();//新添加的,原文没有<br>
              }<br>
              }<br>
              class OutlineManager extends DefaultDesktopManager { <br>
              private Rectangle start, last;<br>
              private boolean first = true;</p>
            <p> // dragging ...</p>
            <p> public void beginDraggingFrame(JComponent frame) {<br>
              initializeOutline(frame);<br>
              }<br>
              public void dragFrame(JComponent frame, int x, int y) {<br>
              updateOutline(frame, x, y, start.width, start.height);<br>
              }<br>
              public void endDraggingFrame(JComponent frame) {<br>
              endOutline(frame);<br>
              }</p>
            <p> // resizing ...</p>
            <p> public void beginResizingFrame(JComponent frame, int dir) {<br>
              initializeOutline(frame);<br>
              }<br>
              public void resizeFrame(JComponent frame, <br>
              int x, int y, int w, int h) {<br>
              updateOutline(frame, x, y, w, h);<br>
              }<br>
              public void endResizingFrame(JComponent frame) {<br>
              endOutline(frame);<br>
              }</p>
            <p> // outline ...</p>
            <p> private void initializeOutline(final JComponent frame) {<br>
              // the call to setVisible() calls repaint, which<br>
              // places a paint event on the event queue.<br>
              // therefore, the effect of the setVisible() call is<br>
              // not apparent until after this method returns</p>
            <p> frame.setVisible(false);<br>
              start = frame.getBounds();<br>
              last = new Rectangle(start);<br>
              first = true;</p>
            <p> // the Runnable below paints the initial outline <br>
              // after the repaint event spawned by setVisible() is<br>
              // handled</p>
            <p> SwingUtilities.invokeLater(new Runnable() {<br>
              public void run() {<br>
              updateOutline(frame,start.x,start.y,<br>
              start.width,start.height);<br>
              }<br>
              });<br>
              }<br>
              private void updateOutline(JComponent frame, <br>
              int x, int y, int w, int h) {<br>
              Container container = frame.getParent();<br>
              Graphics g = container.getGraphics();</p>
            <p> try {<br>
              g.setXORMode(container.getBackground());</p>
            <p> if( ! first) {<br>
              g.drawRect(last.x, last.y, <br>
              last.width-1, last.height-1);<br>
              }<br>
              g.drawRect(x, y, w-1, h-1);<br>
              first = false;<br>
              }<br>
              finally {<br>
              g.dispose();<br>
              last.setBounds(x,y,w,h);<br>
              }<br>
              }<br>
              private void endOutline(JComponent frame) {<br>
              frame.setVisible(true);<br>
              setBoundsForFrame(<br>
              frame, last.x, last.y, last.width, last.height);<br>
              }<br>
              }</p>
            <hr size="1" noshade>
            <p> 15.4 本章回顾</p>
            <p>&nbsp;</p>
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            </p>
            <p>&nbsp; </p>
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