old-autovect-branch/libjava/classpath/javax/swing/text/FieldView.java

   1 /* FieldView.java --
   2    Copyright (C) 2004 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 import java.awt.Component;
  42 import java.awt.ComponentOrientation;
  43 import java.awt.FontMetrics;
  44 import java.awt.Graphics;
  45 import java.awt.Rectangle;
  46 import java.awt.Shape;
  47
  48 import javax.swing.JTextField;
  49 import javax.swing.event.DocumentEvent;
  50
  51 public class FieldView extends PlainView
  52 {
  53   public FieldView(Element elem)
  54   {
  55     super(elem);
  56   }
  57
  58   protected FontMetrics getFontMetrics()
  59   {
  60     Component container = getContainer();
  61     return container.getFontMetrics(container.getFont());
  62   }
  63
  64   /**
  65    * Vertically centers the single line of text within the
  66    * bounds of the input shape. The returned Rectangle is centered
  67    * vertically within <code>shape</code> and has a height of the
  68    * preferred span along the Y axis. Horizontal adjustment is done according
  69    * to the horizontalAligment property of the component that is rendered.
  70    *
  71    * @param shape the shape within which the line is beeing centered
  72    */
  73   protected Shape adjustAllocation(Shape shape)
  74   {
  75     Rectangle rectIn = shape.getBounds();
  76     // vertical adjustment
  77     int height = (int) getPreferredSpan(Y_AXIS);
  78     int y = rectIn.y + (rectIn.height - height) / 2;
  79     // horizontal adjustment
  80     JTextField textField = (JTextField) getContainer();
  81     int halign = textField.getHorizontalAlignment();
  82     int width = (int) getPreferredSpan(X_AXIS);
  83     int x;
  84     ComponentOrientation orientation = textField.getComponentOrientation();
  85     switch (halign)
  86       {
  87       case JTextField.CENTER:
  88         x = rectIn.x + (rectIn.width - width) / 2;
  89         break;
  90       case JTextField.RIGHT:
  91         x = rectIn.x + (rectIn.width - width);
  92         break;
  93       case JTextField.TRAILING:
  94         if (orientation.isLeftToRight())
  95           x = rectIn.x + (rectIn.width - width);
  96         else
  97           x = rectIn.x;
  98         break;
  99       case JTextField.LEADING:
 100         if (orientation.isLeftToRight())
 101           x = rectIn.x;
 102         else
 103           x = rectIn.x + (rectIn.width - width);
 104         break;
 105       case JTextField.LEFT:
 106       default:
 107         x = rectIn.x;
 108         break;
 109       }
 110     return new Rectangle(x, y, width, height);
 111   }
 112
 113   public float getPreferredSpan(int axis)
 114   {
 115     if (axis != X_AXIS && axis != Y_AXIS)
 116       throw new IllegalArgumentException();
 117
 118     FontMetrics fm = getFontMetrics();
 119
 120     if (axis == Y_AXIS)
 121       return super.getPreferredSpan(axis);
 122
 123     String text;
 124     Element elem = getElement();
 125
 126     try
 127       {
 128         text = elem.getDocument().getText(elem.getStartOffset(),
 129                                           elem.getEndOffset());
 130       }
 131     catch (BadLocationException e)
 132       {
 133         // Should never happen
 134         AssertionError ae = new AssertionError();
 135         ae.initCause(e);
 136         throw ae;
 137       }
 138
 139     return fm.stringWidth(text);
 140   }
 141
 142   public int getResizeWeight(int axis)
 143   {
 144     return axis = axis == X_AXIS ? 1 : 0;
 145   }
 146
 147   public Shape modelToView(int pos, Shape a, Position.Bias bias)
 148     throws BadLocationException
 149   {
 150     Shape newAlloc = adjustAllocation(a);
 151     return super.modelToView(pos, newAlloc, bias);
 152   }
 153
 154   public void paint(Graphics g, Shape s)
 155   {
 156     Shape newAlloc = adjustAllocation(s);
 157     super.paint(g, newAlloc);
 158   }
 159
 160   public void insertUpdate(DocumentEvent ev, Shape shape, ViewFactory vf)
 161   {
 162     Shape newAlloc = adjustAllocation(shape);
 163     super.insertUpdate(ev, newAlloc, vf);
 164     getContainer().repaint();
 165   }
 166
 167   public void removeUpdate(DocumentEvent ev, Shape shape, ViewFactory vf)
 168   {
 169     Shape newAlloc = adjustAllocation(shape);
 170     super.removeUpdate(ev, newAlloc, vf);
 171     getContainer().repaint();
 172   }
 173
 174   public void changedUpdate(DocumentEvent ev, Shape shape, ViewFactory vf)
 175   {
 176     Shape newAlloc = adjustAllocation(shape);
 177     super.removeUpdate(ev, newAlloc, vf);
 178     getContainer().repaint();
 179   }
 180
 181   public int viewToModel(float fx, float fy, Shape a, Position.Bias[] bias)
 182   {
 183     return super.viewToModel(fx, fy, a, bias);
 184   }
 185
 186 }