Source for javax.swing.text.ParagraphView

   1: /* ParagraphView.java -- A composite View
   2:    Copyright (C) 2005  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;
  40: 
  41: /**
  42:  * A {@link FlowView} that flows it's children horizontally and boxes the rows
  43:  * vertically.
  44:  *
  45:  * @author Roman Kennke (roman@kennke.org)
  46:  */
  47: public class ParagraphView extends FlowView implements TabExpander
  48: {
  49:   /**
  50:    * A specialized horizontal <code>BoxView</code> that represents exactly
  51:    * one row in a <code>ParagraphView</code>.
  52:    */
  53:   class Row extends BoxView
  54:   {
  55:     /**
  56:      * Creates a new instance of <code>Row</code>.
  57:      */
  58:     Row(Element el)
  59:     {
  60:       super(el, X_AXIS);
  61:     }
  62:     public float getAlignment(int axis)
  63:     {
  64:       // FIXME: This is very likely not 100% correct. Work this out.
  65:       return 0.0F;
  66:     }
  67:   }
  68: 
  69:   /**
  70:    * Creates a new <code>ParagraphView</code> for the given
  71:    * <code>Element</code>.
  72:    *
  73:    * @param element the element that is rendered by this ParagraphView
  74:    */
  75:   public ParagraphView(Element element)
  76:   {
  77:     super(element, Y_AXIS);
  78:   }
  79: 
  80:   public float nextTabStop(float x, int tabOffset)
  81:   {
  82:     throw new InternalError("Not implemented yet");
  83:   }
  84: 
  85:   /**
  86:    * Creates a new view that represents a row within a flow.
  87:    *
  88:    * @return a view for a new row
  89:    */
  90:   protected View createRow()
  91:   {
  92:     return new Row(getElement());
  93:   }
  94: 
  95:   /**
  96:    * Returns the alignment for this paragraph view for the specified axis.
  97:    * For the X_AXIS the paragraph view will be aligned at it's left edge
  98:    * (0.0F). For the Y_AXIS the paragraph view will be aligned at the
  99:    * center of it's first row.
 100:    *
 101:    * @param axis the axis which is examined
 102:    *
 103:    * @return the alignment for this paragraph view for the specified axis
 104:    */
 105:   public float getAlignment(int axis)
 106:   {
 107:     if (axis == X_AXIS)
 108:       return 0.0F;
 109:     else if (getViewCount() > 0)
 110:       {
 111: 
 112:         float prefHeight = getPreferredSpan(Y_AXIS);
 113:         float firstRowHeight = getView(0).getPreferredSpan(Y_AXIS);
 114:         return (firstRowHeight / 2.F) / prefHeight;
 115:       }
 116:     else
 117:       return 0.0F;
 118:   }
 119: }