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

   1: /* SwingLabelPeer.java -- A Swing based peer for AWT labels
   2:    Copyright (C)  2006, 2007  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.Container;
  41: import java.awt.Graphics;
  42: import java.awt.Image;
  43: import java.awt.Label;
  44: import java.awt.Point;
  45: import java.awt.event.FocusEvent;
  46: import java.awt.event.KeyEvent;
  47: import java.awt.event.MouseEvent;
  48: import java.awt.peer.LabelPeer;
  49: 
  50: import javax.swing.JComponent;
  51: import javax.swing.JLabel;
  52: 
  53: 
  54: /**
  55:  * A Label peer based on {@link JLabel}.
  56:  *
  57:  * @author Roman Kennke (kennke@aicas.com)
  58:  */
  59: public class SwingLabelPeer
  60:   extends SwingComponentPeer
  61:   implements LabelPeer
  62: {
  63: 
  64:   /**
  65:    * A spezialized Swing label used to paint the label for the AWT Label.
  66:    *
  67:    * @author Roman Kennke (kennke@aicas.com)
  68:    */
  69:   private class SwingLabel
  70:     extends JLabel
  71:     implements SwingComponent
  72:   {
  73:     Label label;
  74: 
  75: 
  76:     SwingLabel(Label label)
  77:     {
  78:         this.label = label;
  79:     }
  80: 
  81:     /**
  82:      * Returns this label.
  83:      *
  84:      * @return <code>this</code>
  85:      */
  86:     public JComponent getJComponent()
  87:     {
  88:       return this;
  89:     }
  90: 
  91:     /**
  92:      * Handles mouse events by forwarding it to
  93:      * <code>processMouseEvent()</code>.
  94:      *
  95:      * @param ev the mouse event
  96:      */
  97:     public void handleMouseEvent(MouseEvent ev)
  98:     {
  99:       processMouseEvent(ev);
 100:     }
 101: 
 102:     /**
 103:      * Handles mouse motion events by forwarding it to
 104:      * <code>processMouseMotionEvent()</code>.
 105:      *
 106:      * @param ev the mouse motion event
 107:      */
 108:     public void handleMouseMotionEvent(MouseEvent ev)
 109:     {
 110:       processMouseMotionEvent(ev);
 111:     }
 112: 
 113:     /**
 114:      * Handles key events by forwarding it to <code>processKeyEvent()</code>.
 115:      *
 116:      * @param ev the mouse event
 117:      */
 118:     public void handleKeyEvent(KeyEvent ev)
 119:     {
 120:       processKeyEvent(ev);
 121:     }
 122: 
 123:     /**
 124:      * Handles focus events by forwarding it to
 125:      * <code>processFocusEvent()</code>.
 126:      *
 127:      * @param ev the Focus event
 128:      */
 129:     public void handleFocusEvent(FocusEvent ev)
 130:     {
 131:       processFocusEvent(ev);
 132:     }
 133: 
 134:     /**
 135:      * Overridden so that this method returns the correct value even without a
 136:      * peer.
 137:      *
 138:      * @return the screen location of the button
 139:      */
 140:     public Point getLocationOnScreen()
 141:     {
 142:       return SwingLabelPeer.this.getLocationOnScreen();
 143:     }
 144: 
 145:     /**
 146:      * Overridden so that the isShowing method returns the correct value for the
 147:      * swing button, even if it has no peer on its own.
 148:      *
 149:      * @return <code>true</code> if the button is currently showing,
 150:      *         <code>false</code> otherwise
 151:      */
 152:     public boolean isShowing()
 153:     {
 154:       boolean retVal = false;
 155:       if (label != null)
 156:         retVal = label.isShowing();
 157:       return retVal;
 158:     }
 159: 
 160:     /**
 161:      * Overridden, so that the Swing button can create an Image without its
 162:      * own peer.
 163:      *
 164:      * @param w the width of the image
 165:      * @param h the height of the image
 166:      *
 167:      * @return an image
 168:      */
 169:     public Image createImage(int w, int h)
 170:     {
 171:       return SwingLabelPeer.this.createImage(w, h);
 172:     }
 173: 
 174:     public Graphics getGraphics()
 175:     {
 176:       return SwingLabelPeer.this.getGraphics();
 177:     }
 178: 
 179:     public Container getParent()
 180:     {
 181:       Container par = null;
 182:       if (label != null)
 183:         par = label.getParent();
 184:       return par;
 185:     }
 186:   }
 187: 
 188:   /**
 189:    * Creates a new <code>SwingLabelPeer</code> for the specified AWT label.
 190:    *
 191:    * @param label the AWT label
 192:    */
 193:   public SwingLabelPeer(Label label)
 194:   {
 195:     super();
 196:     SwingLabel swingLabel = new SwingLabel(label);
 197:     swingLabel.setText(label.getText());
 198:     swingLabel.setOpaque(true);
 199:     init(label, swingLabel);
 200:     setAlignment(label.getAlignment());
 201:   }
 202: 
 203:   /**
 204:    * Sets the text of the label. This is implemented to set the text on the
 205:    * Swing label.
 206:    *
 207:    * @param text the text to be set
 208:    */
 209:   public void setText(String text)
 210:   {
 211:     ((JLabel) swingComponent.getJComponent()).setText(text);
 212:   }
 213: 
 214:   /**
 215:    * Sets the horizontal alignment of the label. This is implemented to
 216:    * set the alignment on the Swing label.
 217:    *
 218:    * @param alignment the horizontal alignment
 219:    *
 220:    * @see Label#LEFT
 221:    * @see Label#RIGHT
 222:    * @see Label#CENTER
 223:    */
 224:   public void setAlignment(int alignment)
 225:   {
 226:     JLabel swingLabel = (JLabel) swingComponent.getJComponent();
 227:     switch (alignment)
 228:       {
 229:       case Label.RIGHT:
 230:         swingLabel.setHorizontalAlignment(JLabel.RIGHT);
 231:         break;
 232:       case Label.CENTER:
 233:         swingLabel.setHorizontalAlignment(JLabel.CENTER);
 234:         break;
 235:       case Label.LEFT:
 236:       default:
 237:         swingLabel.setHorizontalAlignment(JLabel.LEFT);
 238:         break;
 239:       }
 240:   }
 241: 
 242: }