s11.htm

Java2Swingt界面设计

              (String)cb.getSelectedItem());</p>
            <p> slider.setMajorTickSpacing(spacing);<br>
              slider.revalidate();<br>
              }<br>
              });<br>
              }<br>
              }<br>
              }</p>
            <hr size="1" noshade>
            <p> 11.2.3 滑杆标签</p>
            <p>&nbsp;</p>
            <p align="center"><b>例11-7 显示缺省的JSlider标签</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>
              public Test() {<br>
              Container contentPane = getContentPane();<br>
              JSlider slider = new JSlider();</p>
            <p> slider.setPaintLabels(true);<br>
              slider.setMajorTickSpacing(20);<br>
              contentPane.add(slider, BorderLayout.NORTH);<br>
              }<br>
              }</p>
            <hr size="1" noshade>
            <p align="center"><b>例11-8 定制滑杆标签</b></p>
            <hr noshade size="1">
            import java.util.*;<br>
            import java.awt.*;<br>
            import java.awt.event.*;<br>
            import javax.swing.*;
            <p>public class Test extends JApplet {<br>
              public Test() {<br>
              Container contentPane = getContentPane();<br>
              JSlider slider = new JSlider();<br>
              Icon[] icons = {<br>
              new ImageIcon(&quot;basketball.gif&quot;), <br>
              new ImageIcon(&quot;baseball.gif&quot;), <br>
              new ImageIcon(&quot;soccer.gif&quot;), <br>
              new ImageIcon(&quot;clipboard.gif&quot;), <br>
              new ImageIcon(&quot;filmstrip.gif&quot;), <br>
              new ImageIcon(&quot;crab.gif&quot;), <br>
              };<br>
              Hashtable table = new Hashtable();</p>
            <p> for(int i=0, loc=0; i &lt; icons.length; i++, loc += 20) {<br>
              table.put(new Integer(loc), <br>
              new JLabel(Integer.toString(loc), <br>
              icons[i],<br>
              JLabel.LEFT)); <br>
              }</p>
            <p> slider.setLabelTable(table);<br>
              slider.setPaintLabels(true);<br>
              slider.setMajorTickSpacing(20);</p>
            <p> contentPane.add(slider, BorderLayout.NORTH);<br>
              }<br>
              }</p>
            <hr size="1" noshade>
            <p>&nbsp;</p>
            <p> 11.2.4 反转滑杆值</p>
            <p>&nbsp;</p>
            <p align="center"><b>例11-9 中列出图11-10中示出的小应用程序的代码</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>
              private JCheckBox checkBox = new JCheckBox(&quot;Invert&quot;);<br>
              private JSlider[] sliders = { new JSlider(), <br>
              new JSlider(JSlider.VERTICAL) };</p>
            <p> public Test() {<br>
              Container contentPane = getContentPane();</p>
            <p> contentPane.setLayout(new FlowLayout());<br>
              contentPane.add(checkBox);</p>
            <p> for(int i=0; i &lt; sliders.length; ++i) {<br>
              sliders[i].setPaintLabels(true);<br>
              sliders[i].setMajorTickSpacing(20);<br>
              contentPane.add(sliders[i]);<br>
              }</p>
            <p> checkBox.addActionListener(new ActionListener() {<br>
              public void actionPerformed(ActionEvent e) {<br>
              for(int i=0; i &lt; sliders.length; ++i)<br>
              sliders[i].setInverted(checkBox.isSelected());<br>
              }<br>
              });<br>
              }<br>
              }</p>
            <hr size="1" noshade>
            <p> 11.2.5 滑杆的外延值</p>
            <p>&nbsp;</p>
            <p align="center"><b>例11-10 设置一个滑杆的外延值</b></p>
            <hr noshade size="1">
            import java.awt.*;<br>
            import java.awt.event.*;<br>
            import javax.swing.*;<br>
            import javax.swing.event.*;
            <p>public class Test extends JApplet {<br>
              public Test() {<br>
              Container contentPane = getContentPane();<br>
              JSlider slider = new JSlider();<br>
              JPanel controlPanel = new ControlPanel(slider);</p>
            <p> contentPane.add(controlPanel, BorderLayout.NORTH);<br>
              contentPane.add(slider, BorderLayout.SOUTH);</p>
            <p> slider.addChangeListener(new ChangeListener() {<br>
              public void stateChanged(ChangeEvent e) {<br>
              JSlider s = (JSlider)e.getSource();<br>
              showStatus(&quot;Min: &quot; + s.getMinimum() + <br>
              &quot;, Max: &quot; + s.getMaximum() +<br>
              &quot;, Extent: &quot; + s.getExtent() +<br>
              &quot;, Value: &quot; + s.getValue());<br>
              }<br>
              });<br>
              }<br>
              }<br>
              class ControlPanel extends JPanel {<br>
              public ControlPanel(final JSlider slider) {<br>
              JComboBox extent = new JComboBox();</p>
            <p> extent.addItem(&quot;0&quot;);<br>
              extent.addItem(&quot;10&quot;);<br>
              extent.addItem(&quot;20&quot;);<br>
              extent.addItem(&quot;30&quot;);<br>
              extent.addItem(&quot;40&quot;);</p>
            <p> add(new JLabel(&quot;Extent:&quot;));<br>
              add(extent);</p>
            <p> extent.addItemListener(new ItemListener() {<br>
              public void itemStateChanged(ItemEvent e) {<br>
              JComboBox cb = (JComboBox)e.getSource();<br>
              int ext = Integer.parseInt(<br>
              (String)cb.getSelectedItem());</p>
            <p> slider.setExtent(ext);<br>
              slider.revalidate();<br>
              }<br>
              });<br>
              }<br>
              }</p>
            <hr size="1" noshade>
            <p> 11.2.6 JSlider属性</p>
            <p>&nbsp;</p>
            <p> 11.2.7 JSlider事件</p>
            <p>&nbsp;</p>
            <p align="center"><b>例11-11 监视一个滑杆的值</b></p>
            <hr noshade size="1">
            import java.awt.*;<br>
            import java.awt.event.*;<br>
            import javax.swing.*;<br>
            import javax.swing.event.*;
            <p>public class Test extends JApplet {<br>
              public Test() {<br>
              Container contentPane = getContentPane();<br>
              JSlider slider = new JSlider();</p>
            <p> contentPane.add(slider, BorderLayout.NORTH);</p>
            <p> slider.addChangeListener(new ChangeListener() {<br>
              public void stateChanged(ChangeEvent e) {<br>
              JSlider s = (JSlider)e.getSource();<br>
              showStatus(&quot;Min: &quot; + s.getMinimum() + <br>
              &quot;, Max: &quot; + s.getMaximum() +<br>
              &quot;, Extent: &quot; + s.getExtent() +<br>
              &quot;, Value: &quot; + s.getValue() +<br>
              &quot;, Value Is Adjusting: &quot; +<br>
              s.getValueIsAdjusting());<br>
              }<br>
              });<br>
              }<br>
              }</p>
            <hr size="1" noshade>
            <p> 11.2.8 JSlider类总结</p>
            <p>&nbsp;</p>
            <p> 11.2.9 AWT兼容</p>
            <p>&nbsp;</p>
            <p> 11.3 JSeparator</p>
            <p>&nbsp;</p>
            <p align="center"><b>例11-12 一个不可见的分隔条</b></p>
            <hr noshade size="1">
            import java.awt.*;<br>
            import javax.swing.*;
            <p>public class Test extends JApplet {<br>
              public void init() {<br>
              Container contentPane = getContentPane();<br>
              JSeparator s = new JSeparator(JSeparator.VERTICAL);</p>
            <p> contentPane.setLayout(new FlowLayout());</p>
            <p> contentPane.add(new JButton(&quot;left&quot;));<br>
              contentPane.add(s);<br>
              contentPane.add(new JButton(&quot;right&quot;));<br>
              }<br>
              }</p>
            <hr size="1" noshade>
            <p align="center"><b>例11-13 控制分隔条的大小</b></p>
            <hr noshade size="1">
            import java.awt.*;<br>
            import javax.swing.*;
            <p>public class Test extends JApplet {<br>
              public void init() {<br>
              Container contentPane = getContentPane();<br>
              JSeparator s = new JSeparator(JSeparator.VERTICAL);<br>
              Dimension ps = s.getPreferredSize();</p>
            <p> contentPane.setLayout(new FlowLayout());</p>
            <p> contentPane.add(new JButton(&quot;left&quot;));<br>
              contentPane.add(s);<br>
              contentPane.add(new JButton(&quot;right&quot;));</p>
            <p> s.setPreferredSize(new Dimension(ps.width, 50));<br>
              }<br>
              }</p>
            <hr size="1" noshade>
            <p align="center"><b>例11-14 监控分隔条的大小</b></p>
            <hr noshade size="1">
            import java.awt.*;<br>
            import java.awt.event.*;<br>
            import javax.swing.*;
            <p>public class Test extends JApplet {</p>
            <p> public void init() {<br>
              Container contentPane = getContentPane();<br>
              final JSeparator s = <br>
              new JSeparator(JSeparator.VERTICAL);<br>
              final Dimension ps = s.getPreferredSize();</p>
            <p> contentPane.setLayout(new FlowLayout());</p>
            <p> contentPane.add(new JButton(&quot;left&quot;));<br>
              contentPane.add(s);<br>
              contentPane.add(new JButton(&quot;right&quot;));</p>
            <p> addComponentListener(new ComponentAdapter() {<br>
              public void componentShown(ComponentEvent e) {<br>
              System.out.println(&quot;shown&quot;);<br>
              adjustSeparatorPreferredSize();<br>
              }<br>
              public void componentResized(ComponentEvent e) {<br>
              System.out.println(&quot;resized&quot;);<br>
              adjustSeparatorPreferredSize();<br>
              }<br>
              private void adjustSeparatorPreferredSize() {<br>
              s.setPreferredSize(new Dimension(ps.width, <br>
              getSize().height));<br>
              s.revalidate();<br>
              }<br>
              });<br>
              }<br>
              }</p>
            <hr size="1" noshade>
            <p>&nbsp;</p>
            <p>&nbsp;</p>
            <p> 11.3.1 分隔条与框</p>
            <p>&nbsp;</p>
            <p align="center"><b>例11-15 分隔条与框</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>
              private JPanel left, rightTop, rightBottom;</p>
            <p> private Box box = new Box(BoxLayout.X_AXIS),<br>
              rightBox = new Box(BoxLayout.Y_AXIS);</p>
            <p> private JSeparator vs, hs; // vs = vertical separator<br>
              // hs = horizontal separator<br>
              public void init() {<br>
              createBoxes();<br>
              setPanelBorders();<br>
              //setSeparatorPreferredSizes();</p>
            <p> left.setPreferredSize(new Dimension(150,0));</p>
            <p> getContentPane().add(box, BorderLayout.CENTER);<br>
              }<br>
              private void createBoxes() {</p>
            <p> Component vStrut = box.createVerticalStrut(10),<br>
              hStrut = box.createHorizontalStrut(10);</p>
            <p> rightBox.add(rightTop = new JPanel());<br>
              rightBox.add(box.createVerticalStrut(10));<br>
              rightBox.add(hs = new JSeparator());<br>
              rightBox.add(box.createVerticalStrut(10));<br>
              rightBox.add(rightBottom = new JPanel());</p>
            <p> box.add(left = new JPanel());<br>
              box.add(box.createHorizontalStrut(10));<br>
              box.add(vs = new JSeparator(JSeparator.VERTICAL));<br>
              box.add(box.createHorizontalStrut(10));<br>
              box.add(rightBox);<br>
              }<br>
              private void setSeparatorPreferredSizes() {<br>
              vs.setMaximumSize( <br>
              new Dimension(vs.getPreferredSize().width, <br>
              Integer.MAX_VALUE));</p>
            <p> hs.setMaximumSize(<br>
              new Dimension(Integer.MAX_VALUE,<br>
              hs.getPreferredSize().height));<br>
              }<br>
              private void setPanelBorders() {<br>
              left.setBorder(<br>
              BorderFactory.createTitledBorder(&quot;Left&quot;));<br>
              rightTop.setBorder(<br>
              BorderFactory.createTitledBorder(&quot;Right Top&quot;));<br>
              rightBottom.setBorder(<br>
              BorderFactory.createTitledBorder(&quot;Right Bottom&quot;));<br>
              }<br>
              }</p>
            <hr size="1" noshade>
            <p> 11.3.2 JSeparator属性</p>
            <p>&nbsp;</p>
            <p> 11.3.3 JSeparator事件</p>
            <p>&nbsp;</p>
            <p> 11.3.4 AWT兼容</p>
            <p>&nbsp;</p>
            <p> 11.4 本章回顾 </p>
            <p>&nbsp;</p>
            <p>[<a href="index.html" target="_self">目录</a>][<a href="s10.htm">上一页</a>][<a href="s12.htm">下一页</a>](飒龙收藏/2002.5.18) 
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