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☞ Key Point　情報隠蔽の原則


  • ［54-67］作成者（プログラマー）は、特定のイベントに依存する箇所を抽出して、独立したインターフェース/抽象クラスを規定します。
  • ［44-49］利用者（プログラマー）は、final 宣言が不要になります。


    

        tips350_MouseClicked/java/src/AppWindow.scala
    

  1: /*
  2:  * Copyright (c) 2010-2013, KOTSUBU-chan and/or its affiliates.
  3:  * Copyright (c) 1998, Atelier-AYA.
  4:  * All rights reserved.
  5:  */ 
  6: package cherry.pie;
  7: 
  8: import java.awt.*;
  9: import java.awt.event.*;
 10: import javax.swing.*;
 11: 
 12: // ----------------------------------------
 13: public class AppWindow extends JFrame {
 14:   static String version = AppWindow
 15:     .class.getName() + ": #1.0.01";
 16:   // ----------------------------------------
 17:   static void example() {
 18:     JFrame frame = new AppWindow("JTextField");
 19:     frame.add(new View(frame));
 20:     frame.pack();
 21:     frame.setVisible(true);
 22:   }
 23: 
 24:   // ----------------------------------------
 25:   AppWindow(String title) {
 26:     super(title);
 27:     setLocationRelativeTo(null);
 28:     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 29:   }
 30: }
 31: 
 32: // ----------------------------------------
 33: /* note: error
 34:  * ----------------------------------------
 35:  * ローカル変数 frame は内部クラスからアクセスされます。final で宣言される必要があります。
 36:  *         frame.setTitle(p.toString());
 37:  *         ^
 38:  */ 
 39: class View extends JPanel {
 40:   private JFrame frame;
 41:   View(JFrame frame) {
 42:     this.frame = frame;
 43:     setPreferredSize(new Dimension(260,100));
 44:     new MouseClicked() {
 45:       public void execute(Point p) {
 46:         ((View)source).frame.setTitle(p.toString());

 47: //        frame.setTitle(p.toString());   *1
 48:       }
 49:     }.listenTo(this);
 50:   }
 51: }
 52: 
 53: // ----------------------------------------
 54: interface Reactor {
 55:   public void execute(Point p);
 56: }
 57: abstract class MouseClicked extends MouseAdapter
 58:   implements Reactor {
 59:   public void mouseClicked(MouseEvent e) {
 60:     execute(e.getPoint());
 61:   }
 62:   protected JComponent source;
 63:   public void listenTo(JComponent comp) {
 64:     comp.addMouseListener(this);
 65:     source = comp;
 66:   }
 67: }

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*1:☞ Key Point　情報隠蔽の原則

Java.use(better, java.awt.event.MouseEvent); Tips#350

Java Scala Swing

《前の記事｜記事一覧｜次の記事》
Java.use(better, Tips);


Tips#350

java.awt.event.MouseEvent



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Laozi - Wikipedia

《関連記事》


《事例》


■ INDEX
>>> dir(java.awt.event.MouseEvent)
['ACTION_EVENT_MASK', 'ADJUSTMENT_EVENT_MASK', 'ALT_DOWN_MASK', 'ALT_GRAPH_DOWN_MASK', 'ALT_GRAPH_MASK', 'ALT_MASK', 'BUTTON1', 'BUTTON1_DOWN_MASK', 'BUTTON1_MASK', 'BUTTON2', 'BUTTON2_DOWN_MASK', 'BUTTON2_MASK', 'BUTTON3', 'BUTTON3_DOWN_MASK', 'BUTTON3_MASK', 'COMPONENT_EVENT_MASK', 'COMPONENT_FIRST', 'COMPONENT_HIDDEN', 'COMPONENT_LAST', 'COMPONENT_MOVED', 'COMPONENT_RESIZED', 'COMPONENT_SHOWN', 'CONTAINER_EVENT_MASK', 'CTRL_DOWN_MASK', 'CTRL_MASK', 'FOCUS_EVENT_MASK', 'HIERARCHY_BOUNDS_EVENT_MASK', 'HIERARCHY_EVENT_MASK', 'ID', 'INPUT_METHOD_EVENT_MASK', 'INVOCATION_EVENT_MASK', 'ITEM_EVENT_MASK', 'KEY_EVENT_MASK', 'META_DOWN_MASK', 'META_MASK', 'MOUSE_CLICKED', 'MOUSE_DRAGGED', 'MOUSE_ENTERED', 'MOUSE_EVENT_MASK', 'MOUSE_EXITED', 'MOUSE_FIRST', 'MOUSE_LAST', 'MOUSE_MOTION_EVENT_MASK', 'MOUSE_MOVED', 'MOUSE_PRESSED', 'MOUSE_RELEASED', 'MOUSE_WHEEL', 'MOUSE_WHEEL_EVENT_MASK', 'NOBUTTON', 'PAINT_EVENT_MASK', 'RESERVED_ID_MAX', 'SHIFT_DOWN_MASK', 'SHIFT_MASK', 'TEXT_EVENT_MASK', 'WINDOW_EVENT_MASK', 'WINDOW_FOCUS_EVENT_MASK', 'WINDOW_STATE_EVENT_MASK', '__class__', '__delattr__', '__doc__', '__eq__', '__getattribute__', '__hash__', '__init__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__str__', 'altDown', 'altGraphDown', 'button', 'class', 'clickCount', 'component', 'consume', 'consumed', 'controlDown', 'equals', 'getButton', 'getClass', 'getClickCount', 'getComponent', 'getID', 'getModifiers', 'getModifiersEx', 'getModifiersExText', 'getMouseModifiersText', 'getPoint', 'getSource', 'getWhen', 'getX', 'getY', 'hashCode', 'isAltDown', 'isAltGraphDown', 'isConsumed', 'isControlDown', 'isMetaDown', 'isPopupTrigger', 'isShiftDown', 'metaDown', 'modifiers', 'modifiersEx', 'notify', 'notifyAll', 'paramString', 'point', 'popupTrigger', 'setSource', 'shiftDown', 'source', 'toString', 'translatePoint', 'wait', 'when', 'x', 'y']

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Created: 1998/05/23｜Last updated: 2013/04/12 22:43:32