Source for gnu.java.awt.peer.swing.SwingButtonPeer

   1: /* SwingButtonPeer.java -- A Swing based peer for AWT buttons
   2:    Copyright (C)  2006  Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: package gnu.java.awt.peer.swing;
  39: 
  40: import java.awt.Button;
  41: import java.awt.Graphics;
  42: import java.awt.Image;
  43: import java.awt.Point;
  44: import java.awt.event.ActionEvent;
  45: import java.awt.event.ActionListener;
  46: import java.awt.event.KeyEvent;
  47: import java.awt.event.MouseEvent;
  48: import java.awt.peer.ButtonPeer;
  49: 
  50: import javax.swing.JButton;
  51: import javax.swing.JComponent;
  52: 
  53: /**
  54:  * A Swing based peer for the AWT button.
  55:  *
  56:  * @author Roman Kennke (kennke@aicas.com)
  57:  */
  58: public class SwingButtonPeer
  59:   extends SwingComponentPeer
  60:   implements ButtonPeer
  61: {
  62: 
  63:   /**
  64:    * A specialized Swing button to be used as AWT button.
  65:    *
  66:    * @author Roman Kennke (kennke@aicas.com)
  67:    */
  68:   class SwingButton
  69:     extends JButton
  70:     implements SwingComponent
  71:   {
  72:     /**
  73:      * Overridden so that this method returns the correct value even without a
  74:      * peer.
  75:      *
  76:      * @return the screen location of the button
  77:      */
  78:     public Point getLocationOnScreen()
  79:     {
  80:       return SwingButtonPeer.this.getLocationOnScreen();
  81:     }
  82: 
  83:     /**
  84:      * Overridden so that the isShowing method returns the correct value for the
  85:      * swing button, even if it has no peer on its own.
  86:      *
  87:      * @return <code>true</code> if the button is currently showing,
  88:      *         <code>false</code> otherwise
  89:      */
  90:     public boolean isShowing()
  91:     {
  92:       boolean retVal = false;
  93:       if (SwingButtonPeer.this.awtComponent != null)
  94:         retVal = SwingButtonPeer.this.awtComponent.isShowing();
  95:       return retVal;
  96:     }
  97: 
  98:     /**
  99:      * Overridden, so that the Swing button can create an Image without its
 100:      * own peer.
 101:      *
 102:      * @param w the width of the image
 103:      * @param h the height of the image
 104:      *
 105:      * @return an image
 106:      */
 107:     public Image createImage(int w, int h)
 108:     {
 109:       return SwingButtonPeer.this.createImage(w, h);
 110:     }
 111: 
 112:     /**
 113:      * Overridden, so that the Swing button can create a Graphics without its
 114:      * own peer.
 115:      *
 116:      * @return a graphics instance for the button
 117:      */
 118:     public Graphics getGraphics()
 119:     {
 120:       return SwingButtonPeer.this.getGraphics();
 121:     }
 122: 
 123:     /**
 124:      * Returns this button.
 125:      *
 126:      * @return this button
 127:      */
 128:     public JComponent getJComponent()
 129:     {
 130:       return this;
 131:     }
 132: 
 133:     /**
 134:      * Handles mouse events by forwarding it to
 135:      * <code>processMouseEvent()</code> after having retargetted it to this
 136:      * button.
 137:      *
 138:      * @param ev the mouse event
 139:      */
 140:     public void handleMouseEvent(MouseEvent ev)
 141:     {
 142:       ev.setSource(this);
 143:       processMouseEvent(ev);
 144:     }
 145: 
 146:     /**
 147:      * Handles mouse motion events by forwarding it to
 148:      * <code>processMouseMotionEvent()</code> after having retargetted it to
 149:      * this button.
 150:      *
 151:      * @param ev the mouse motion event
 152:      */
 153:     public void handleMouseMotionEvent(MouseEvent ev)
 154:     {
 155:       ev.setSource(this);
 156:       processMouseMotionEvent(ev);
 157:     }
 158: 
 159:     /**
 160:      * Handles key events by forwarding it to
 161:      * <code>processKeyEvent()</code> after having retargetted it to this
 162:      * button.
 163:      *
 164:      * @param ev the mouse event
 165:      */
 166:     public void handleKeyEvent(KeyEvent ev)
 167:     {
 168:       ev.setSource(this);
 169:       processKeyEvent(ev);
 170:     }
 171:   }
 172: 
 173:   /**
 174:    * Listens for ActionEvents on the Swing button and triggers corresponding
 175:    * ActionEvents on the AWT button.
 176:    *
 177:    * @author Roman Kennke (kennke@aicas.com)
 178:    */
 179:   class SwingButtonListener implements ActionListener
 180:   {
 181: 
 182:     /**
 183:      * Receives notification when an action was performend on the button.
 184:      *
 185:      * @param event the action event
 186:      */
 187:     public void actionPerformed(ActionEvent event)
 188:     {
 189:       Button b = (Button) SwingButtonPeer.this.awtComponent;
 190:       ActionListener[] l = b.getActionListeners();
 191:       if (l.length == 0)
 192:         return;
 193:       ActionEvent ev = new ActionEvent(b, ActionEvent.ACTION_PERFORMED,
 194:                                        b.getActionCommand());
 195:       for (int i = 0; i < l.length; ++i)
 196:         l[i].actionPerformed(ev);
 197:     }
 198:     
 199:   }
 200: 
 201:   /**
 202:    * Constructs a new SwingButtonPeer.
 203:    *
 204:    * @param theButton the AWT button for this peer
 205:    */
 206:   public SwingButtonPeer(Button theButton)
 207:   {
 208:     SwingButton button = new SwingButton();
 209:     button.setText(theButton.getLabel());
 210:     button.addActionListener(new SwingButtonListener());
 211:     init(theButton, button);
 212:   }
 213: 
 214:   /**
 215:    * Sets the label of the button. This call is forwarded to the setText method
 216:    * of the managed Swing button.
 217:    *
 218:    * @param label the label to set
 219:    */
 220:   public void setLabel(String label)
 221:   {
 222:     ((SwingButton) swingComponent).setText(label);
 223:   }
 224: }