JTextComponent 1の変更点

• 追加された行はこのように表示されます。
• 削除された行はこのように表示されます。

!!!JTextComponet 1
[Jython JTextComponet 1][Jython Swing][Swing][Jython][Python]
!!!JTextComponent 1
[Jython JTextComponent 1][Jython Swing][Swing][Jython][Python]

*http://java.sun.com/docs/books/tutorial/uiswing/components/generaltext.html#commands

!!内容
*メニューとアクションの割付
*キーボード押下との割付
*Undo、Redoの実装
*Documentの利用
*Documentのイベント感知

!!ソースコード
::実行例
{{ref_image jtext.jpg}}

::ソースコード

 import java.awt.BorderLayout;
 import java.awt.Event;
 import java.awt.event.ActionEvent;
 import java.awt.event.KeyEvent;
 import java.util.HashMap;
 import java.util.Map;
 
 import javax.swing.AbstractAction;
 import javax.swing.Action;
 import javax.swing.InputMap;
 import javax.swing.JFrame;
 import javax.swing.JMenu;
 import javax.swing.JMenuBar;
 import javax.swing.JScrollPane;
 import javax.swing.JTextArea;
 import javax.swing.KeyStroke;
 import javax.swing.SwingUtilities;
 import javax.swing.event.UndoableEditEvent;
 import javax.swing.event.UndoableEditListener;
 import javax.swing.text.DefaultEditorKit;
 import javax.swing.text.Document;
 import javax.swing.text.JTextComponent;
 import javax.swing.undo.UndoManager;
 
 /**
  * @see http://java.sun.com/docs/books/tutorial/uiswing/components/generaltext.html#commands
  */
 public class JTextTest {
     private JFrame frame;
     
     private Map<Object, Action> actionMap = new HashMap<Object, Action>();
     private UndoManager undo = new UndoManager();
     
     private UndoAction undoAction;
     private RedoAction redoAction;
     
     private JMenu getMenu() {
         JMenu menu = new JMenu("Edit");
         
         menu.add(actionMap.get(DefaultEditorKit.cutAction));
         menu.add(actionMap.get(DefaultEditorKit.copyAction));
         menu.add(actionMap.get(DefaultEditorKit.pasteAction));
         menu.addSeparator();
         
         undoAction = new UndoAction();
         menu.add(undoAction);
         
         redoAction = new RedoAction();
         menu.add(redoAction);
         
         menu.addSeparator();
         menu.add(actionMap.get(DefaultEditorKit.selectAllAction));
         
         return menu;
     }
     private void createActionMap(JTextComponent txt) {
         Action[] actions = txt.getActions();
         for(Action action : actions) {
             this.actionMap.put(action.getValue(Action.NAME), action);
         }
     }
     private void createUI() {
         frame = new JFrame("TextTest");
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
         JTextArea txtArea = new JTextArea(10, 30);
 
         // Documentのイベント感知(Undo Redo 管理を行う)
         Document doc = txtArea.getDocument();
         doc.addUndoableEditListener(
             new UndoableEditListener() {
                 public void undoableEditHappened(UndoableEditEvent e) {
                     undo.addEdit(e.getEdit());
                     undoAction.updateState();
                     redoAction.updateState();
                 }
             }
         );
         
         frame.getContentPane().add(new JScrollPane(txtArea), BorderLayout.CENTER);
         
         // TextComponentが持つActionをMapに格納
         createActionMap(txtArea);
         // メニューを作成
         JMenu menu = getMenu();
         JMenuBar mb = new JMenuBar();
         mb.add(menu);
         frame.setJMenuBar(mb);
         
         // テキストのUndo、Redoにキーを割り当てる (Ctrl+z,Ctrl+y)
         InputMap inputMap = txtArea.getInputMap();
         KeyStroke undoKey = KeyStroke.getKeyStroke(KeyEvent.VK_Z,Event.CTRL_MASK);
         KeyStroke redoKey = KeyStroke.getKeyStroke(KeyEvent.VK_Y,Event.CTRL_MASK);
         inputMap.put(undoKey, undoAction);
         inputMap.put(redoKey, redoAction);
         
         frame.pack();
         frame.setVisible(true);
     }
     public static void main(String[] args) {
         SwingUtilities.invokeLater(
                 new Runnable(){
                     public void run() {
                         JTextTest jft = new JTextTest();
                         jft.createUI();
                     }
                 }
         );
     }
     
     @SuppressWarnings("serial")
     class UndoAction extends AbstractAction {
         public UndoAction() {
             super("Undo");
             setEnabled(false);
         }
         public void actionPerformed(ActionEvent e) {
             try {
                 undo.undo();
             } catch (Exception ex) {
                 ex.printStackTrace();
             }
             updateState();
             // Redo を可能に
             redoAction.updateState();
         }
         public void updateState() {
             setEnabled(undo.canUndo());
         }
     }
     
     @SuppressWarnings("serial")
     class RedoAction extends AbstractAction {
         public RedoAction() {
             super("Redo");
             setEnabled(false);
         }
         public void actionPerformed(ActionEvent e) {
             try {
                 undo.redo();
             } catch (Exception ex) {
                 ex.printStackTrace();
             }
             updateState();
         }
         public void updateState() {
             setEnabled(undo.canRedo());
         }
     }
 }