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

   1: /* SwingContainerPeer.java -- A Swing based peer for AWT containers
   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.Component;
  41: import java.awt.Container;
  42: import java.awt.Graphics;
  43: import java.awt.Insets;
  44: import java.awt.Shape;
  45: import java.awt.event.MouseEvent;
  46: import java.awt.peer.ComponentPeer;
  47: import java.awt.peer.ContainerPeer;
  48: 
  49: /**
  50:  * A peer for Container to be used with the Swing based AWT peers.
  51:  *
  52:  * @author Roman Kennke (kennke@aicas.com)
  53:  */
  54: public class SwingContainerPeer
  55:   extends SwingComponentPeer
  56:   implements ContainerPeer
  57: {
  58: 
  59:   /**
  60:    * Creates a new SwingContainerPeer.
  61:    *
  62:    * @param awtCont
  63:    */
  64:   public SwingContainerPeer(Component awtCont)
  65:   {
  66:     init(awtCont, null);
  67:   }
  68: 
  69:   /**
  70:    * Returns the insets of the container.
  71:    *
  72:    * This is implemented to return the insets of the Swing container.
  73:    *
  74:    * @return the insets of the container
  75:    */
  76:   public Insets insets()
  77:   {
  78:     Insets retVal;
  79:     if (swingComponent != null)
  80:       retVal = swingComponent.getJComponent().getInsets();
  81:     else
  82:       retVal = new Insets(0, 0, 0, 0);
  83:     return retVal;
  84:   }
  85: 
  86:   /**
  87:    * Returns the insets of the container.
  88:    *
  89:    * This is implemented to return the insets of the Swing container.
  90:    *
  91:    * @return the insets of the container
  92:    */
  93:   public Insets getInsets()
  94:   {
  95:     Insets retVal;
  96:     if (swingComponent != null)
  97:       retVal = swingComponent.getJComponent().getInsets();
  98:     else
  99:       retVal = new Insets(0, 0, 0, 0);
 100:     return retVal;
 101:   }
 102: 
 103:   /**
 104:    * Called before the validation of this containers begins.
 105:    */
 106:   public void beginValidate()
 107:   {
 108:     // Nothing to do here.
 109:   }
 110: 
 111:   /**
 112:    * Called after the validation of this containers ended.
 113:    */
 114:   public void endValidate()
 115:   {
 116:     // Nothing to do here.
 117:   }
 118: 
 119:   /**
 120:    * Called before the layout of this containers begins.
 121:    */
 122:   public void beginLayout()
 123:   {
 124:     // Nothing to do here.
 125:   }
 126: 
 127:   /**
 128:    * Called after the layout of this containers ended.
 129:    */
 130:   public void endLayout()
 131:   {
 132:     // Nothing to do here.
 133:   }
 134: 
 135:   /**
 136:    * Returns <code>false</code> unconditionally. This method is not used at
 137:    * the moment.
 138:    *
 139:    * @return <code>false</code>
 140:    */
 141:   public boolean isPaintPending()
 142:   {
 143:     return false;
 144:   }
 145: 
 146:   /**
 147:    * Returns <code>false</code> unconditionally. This method is not used at
 148:    * the moment.
 149:    *
 150:    * @return <code>false</code>
 151:    */
 152:   public boolean isRestackSupported()
 153:   {
 154:     return false;
 155:   }
 156: 
 157:   /**
 158:    * This method is not used at the moment.
 159:    */
 160:   public void cancelPendingPaint(int x, int y, int width, int height)
 161:   {
 162:     // Nothing to do here.
 163:   }
 164: 
 165:   /**
 166:    * This method is not used at the moment.
 167:    */
 168:   public void restack()
 169:   {
 170:     // Nothing to do here.
 171:   }
 172: 
 173:   /**
 174:    * Triggers painting of a component. This calls peerPaint on all the child
 175:    * components of this container.
 176:    *
 177:    * @param g the graphics context to paint to
 178:    */
 179:   protected void peerPaint(Graphics g)
 180:   {
 181:     Container c = (Container) awtComponent;
 182:     Component[] children = c.getComponents();
 183:     for (int i = children.length - 1; i >= 0; --i)
 184:       {
 185:         Component child = children[i];
 186:         ComponentPeer peer = child.getPeer();
 187:         boolean translated = false;
 188:         boolean clipped = false;
 189:         Shape oldClip = g.getClip();
 190:         try
 191:         {
 192:           g.translate(child.getX(), child.getY());
 193:           translated = true;
 194:           g.setClip(0, 0, child.getWidth(), child.getHeight());
 195:           clipped = true;
 196:           if (peer instanceof SwingComponentPeer)
 197:             ((SwingComponentPeer) peer).peerPaint(g);
 198:         }
 199:         finally
 200:         {
 201:           if (translated)
 202:             g.translate(- child.getX(), - child.getY());
 203:           if (clipped)
 204:             g.setClip(oldClip);
 205:         }
 206:       }
 207:   }
 208: 
 209:   /**
 210:    * Handles mouse events by dispatching it to the correct component.
 211:    *
 212:    * @param ev the mouse event
 213:    */
 214:   protected void handleMouseEvent(MouseEvent ev)
 215:   {
 216:     Component comp = awtComponent.getComponentAt(ev.getPoint());
 217:     if(comp == null)
 218:       comp = awtComponent;
 219:     if (comp != null)
 220:       {
 221:         ComponentPeer peer = comp.getPeer();
 222:         if (awtComponent != comp && !comp.isLightweight() && peer instanceof SwingComponentPeer)
 223:           {
 224:             ev.translatePoint(comp.getX(), comp.getY());
 225:             ev.setSource(comp);
 226:             ((SwingComponentPeer) peer).handleMouseEvent(ev);
 227:           }
 228:       }
 229:   }
 230: 
 231:   /**
 232:    * Handles mouse events by dispatching it to the correct component.
 233:    *
 234:    * @param ev the mouse event
 235:    */
 236:   protected void handleMouseMotionEvent(MouseEvent ev)
 237:   {
 238:     Component comp = awtComponent.getComponentAt(ev.getPoint());
 239:     if (comp != null)
 240:       {
 241:         ComponentPeer peer = comp.getPeer();
 242:         if (awtComponent != comp && !comp.isLightweight() && peer instanceof SwingComponentPeer)
 243:           {
 244:             ev.translatePoint(comp.getX(), comp.getY());
 245:             ((SwingComponentPeer) peer).handleMouseMotionEvent(ev);
 246:           }
 247:       }
 248:   }
 249: }