?? s17.htm
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<br> "item[3]", "item[4]", "item[5]",<br> "item[6]", "item[7]", <br> "item[8]", "item[9]" };</p> <p> JList list = new JList(items);</p> <p> list.setPrototypeCellValue("MMMMMMM");</p> <p> controlPanel = new ControlPanel(list);<br> controlPanel.update();</p> <p> listPanel.setBorder(BorderFactory.createEtchedBorder());<br> listPanel.add(new JScrollPane(list));</p> <p> contentPane.add(controlPanel, BorderLayout.NORTH);<br> contentPane.add(listPanel, BorderLayout.CENTER);</p> <p> list.addListSelectionListener(<br> new ListSelectionListener() {<br> public void valueChanged(ListSelectionEvent e) {<br> controlPanel.update();<br> }<br> });<br> }<br> }<br> class ControlPanel extends JPanel {<br> private JComboBox mode = new JComboBox();<br> private JButton clear = new JButton("clear selection");</p> <p> private String single = "SINGLE_SELECTION",<br> singleInterval = "SINGLE_INTERVAL_SELECTION",<br> multipleInterval = "MULTIPLE_INTERVAL_SELECTION";</p> <p> private JLabel leadLabel = new JLabel(),<br> anchorLabel = new JLabel(),<br> minLabel = new JLabel(),<br> maxLabel = new JLabel(),<br> selIndicesLabel = new JLabel();</p> <p> private JList list;</p> <p> public ControlPanel(JList l) {<br> JPanel top = new JPanel(), <br> mid = new JPanel(),<br> bottom = new JPanel();</p> <p> this.list = l;</p> <p> setLayout(new BoxLayout(this, BoxLayout.Y_AXIS)); <br> setBorder(BorderFactory.createEtchedBorder());</p> <p> top.add(mode);<br> top.add(clear);</p> <p> mid.add(new JLabel("Lead:")); mid.add(leadLabel);<br> mid.add(new JLabel("Anchor:")); mid.add(anchorLabel);<br> mid.add(new JLabel("Minimum:")); mid.add(minLabel);<br> mid.add(new JLabel("Maximum:")); mid.add(maxLabel);</p> <p> add(top);<br> add(mid);<br> add(bottom);</p> <p> mode.addItem(single);<br> mode.addItem(singleInterval);<br> mode.addItem(multipleInterval);<br> initializeSelectionMode();</p> <p> bottom.add(new JLabel("Selected Indices:"));<br> bottom.add(selIndicesLabel);</p> <p> mode.addItemListener(new ItemListener() {<br> public void itemStateChanged(ItemEvent e) {<br> if(e.getStateChange() == ItemEvent.SELECTED)<br> setSelectionMode((String)e.getItem());<br> }<br> });<br> clear.addActionListener(new ActionListener() {<br> public void actionPerformed(ActionEvent e) {<br> list.clearSelection();<br> }<br> });<br> }<br> public void update() {<br> int lead = list.getLeadSelectionIndex(),<br> min = list.getMinSelectionIndex(),<br> max = list.getMaxSelectionIndex(),<br> anchor = list.getAnchorSelectionIndex();</p> <p> leadLabel.setText(Integer.toString(lead) + " / ");<br> anchorLabel.setText(Integer.toString(anchor) + " / ");<br> minLabel.setText(Integer.toString(min) + " / ");<br> maxLabel.setText(Integer.toString(max) + " / ");</p> <p> int[] selected = list.getSelectedIndices();<br> String s = new String();</p> <p> for(int i = 0; i < selected.length; ++i) {<br> s += Integer.toString(selected[i]);</p> <p> if(i < selected.length-1)<br> s += ",";<br> }<br> selIndicesLabel.setText(s);<br> validate();<br> }<br> private void initializeSelectionMode() {<br> int m = list.getSelectionMode();</p> <p> switch(m) {<br> case ListSelectionModel.SINGLE_SELECTION:<br> mode.setSelectedItem(single);<br> break;<br> case ListSelectionModel.SINGLE_INTERVAL_SELECTION:<br> mode.setSelectedItem(singleInterval);<br> break;<br> case ListSelectionModel.MULTIPLE_INTERVAL_SELECTION:<br> mode.setSelectedItem(multipleInterval);<br> break;<br> }<br> }<br> private void setSelectionMode(String s) {<br> if(s.equals("SINGLE_SELECTION")) {<br> list.setSelectionMode(<br> ListSelectionModel.SINGLE_SELECTION);<br> }<br> else if(s.equals("SINGLE_INTERVAL_SELECTION")) {<br> list.setSelectionMode(<br> ListSelectionModel.SINGLE_INTERVAL_SELECTION);<br> }<br> else if(s.equals("MULTIPLE_INTERVAL_SELECTION")) {<br> list.setSelectionMode(<br> ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);<br> }<br> }<br> }</p> <hr size="1" noshade> <p align="center"><b>例17-6 處理列表數據事件</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> private JList list = new JList();</p> <p> private String[] items = { <br> "item one", "item two", "item three", <br> "item four", "item five", "item six",<br> "item seven", "item eight", <br> "item nine", "item ten" <br> };</p> <p> public void init() {<br> Container contentPane = getContentPane();</p> <p> JPanel controlPanel = new ControlPanel(this, list);</p> <p> contentPane.add(controlPanel, BorderLayout.NORTH);<br> contentPane.add(new JScrollPane(list), <br> BorderLayout.CENTER);<br> populateList();<br> }<br> public void populateList() {<br> final DefaultListModel model = new DefaultListModel();</p> <p> for(int i=0; i < items.length; ++i)<br> model.addElement(items[i]);</p> <p> list.setModel(model);</p> <p> if(list.isShowing())<br> list.revalidate();</p> <p> model.addListDataListener(new ListDataListener() {<br> public void contentsChanged(ListDataEvent e) {<br> showStatus("contents changed");<br> }<br> public void intervalRemoved(ListDataEvent e) {<br> Object[] message = new Object[] {<br> "Removed item at index " + e.getIndex0(),<br> " ",<br> "There are now " + model.getSize() + " items"<br> };<br> JOptionPane.showMessageDialog(Test.this,<br> message,<br> "Items Removed", // title<br> JOptionPane.INFORMATION_MESSAGE); // type<br> }<br> public void intervalAdded(ListDataEvent e) {<br> showStatus("interval added");<br> }<br> });<br> }<br> }<br> class ControlPanel extends JPanel {<br> JButton remove = new JButton("remove selected items");<br> JButton repopulate = new JButton("repopulate");</p> <p> public ControlPanel(final Test applet, final JList list) {<br> add(remove);<br> add(repopulate);</p> <p> remove.addActionListener(new ActionListener() {<br> public void actionPerformed(ActionEvent e) {<br> int[] selected = list.getSelectedIndices();<br> DefaultListModel model =<br> (DefaultListModel)list.getModel();</p> <p> for(int i=0; i < selected.length; ++i) {<br> model.removeElementAt(selected[i] - i);<br> }<br> }<br> });<br> repopulate.addActionListener(new ActionListener() {<br> public void actionPerformed(ActionEvent e) {<br> applet.populateList();<br> }<br> });<br> }<br> }</p> <hr size="1" noshade> <p> </p> <p> </p> <p align="center"><b>例17-7 處理鼠標雙擊和三擊</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 void init() {<br> Container contentPane = getContentPane();</p> <p> String[] items = { "item one", "item two", "item three", <br> "item four", "item five", "item six",<br> "item seven", "item eight", <br> "item nine", "item ten" };</p> <p> JList list = new JList(items);</p> <p> contentPane.setLayout(new FlowLayout());<br> contentPane.add(new JScrollPane(list));</p> <p> list.addMouseListener(new MouseAdapter() {<br> public void mouseClicked(MouseEvent e) {<br> JList theList = (JList)e.getSource();<br> ListModel model = theList.getModel();</p> <p> int index = theList.locationToIndex(e.getPoint());<br> String itemString = <br> (String)model.getElementAt(index);</p> <p> String s = new String(" for " + <br> model.getElementAt(index));</p> <p> switch(e.getClickCount()) {<br> case 1:<br> showStatus("Single Click" + s);<br> break;<br> case 2:<br> showStatus("Double Click" + s);<br> break;<br> case 3:<br> showStatus("Triple Click" + s);<br> break;<br> }<br> }<br> });<br> }<br> }</p> <hr size="1" noshade> <p> 17.3.3 JList類總結</p> <p> </p> <p> 17.3.4 AWT兼容</p> <p> </p> <p> 17.4 本章回顧</p> <p> </p> <p>[<a href="index.html" target="_self">目錄</a>][<a href="s16.htm">上一頁</a>][<a href="s18.htm">下一頁</a>](颯龍收藏/2002.5.18) </p> </td> </tr> </tbody> </table> </td> </tr></tbody></table><script language="javascript">bottomprint()</script></body></html>?? 快捷鍵說明
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