libjava/classpath/javax/swing/text/html/NullView.java

   1 /* NullView.java -- A dummy view that renders nothing
   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
  39 package javax.swing.text.html;
  40
  41 import java.awt.Graphics;
  42 import java.awt.Shape;
  43
  44 import javax.swing.text.BadLocationException;
  45 import javax.swing.text.Element;
  46 import javax.swing.text.View;
  47 import javax.swing.text.Position.Bias;
  48
  49 /**
  50  * A dummy view that renders nothing. This is used for invisible HTML elements
  51  * like <head>.
  52  *
  53  * @author Roman Kennke (kennke@aicas.com)
  54  */
  55 public class NullView
  56     extends View
  57 {
  58
  59   /**
  60    * Creates a new NullView.
  61    *
  62    * @param elem the element
  63    */
  64   public NullView(Element elem)
  65   {
  66     super(elem);
  67   }
  68
  69   /**
  70    * Does nothing.
  71    */
  72   public void paint(Graphics g, Shape s)
  73   {
  74     // Nothing to do here.
  75   }
  76
  77   /**
  78    * Returns zero for both directions.
  79    */
  80   public float getPreferredSpan(int axis)
  81   {
  82     return 0;
  83   }
  84
  85   /**
  86    * Returns the allocation of this view, which should be empty anyway.
  87    */
  88   public Shape modelToView(int pos, Shape a, Bias b)
  89       throws BadLocationException
  90   {
  91     return a;
  92   }
  93
  94   /**
  95    * Returns the start offset of the element.
  96    */
  97   public int viewToModel(float x, float y, Shape a, Bias[] b)
  98   {
  99     return getElement().getStartOffset();
 100   }
 101
 102 }