libjava/javax/swing/text/PlainView.java

   1 /* PlainView.java --
   2    Copyright (C) 2004, 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., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 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.Color;
  42 import java.awt.Component;
  43 import java.awt.Font;
  44 import java.awt.FontMetrics;
  45 import java.awt.Graphics;
  46 import java.awt.Rectangle;
  47 import java.awt.Shape;
  48
  49 public class PlainView extends View
  50   implements TabExpander
  51 {
  52   Color selectedColor;
  53   Color unselectedColor;
  54   Font font;
  55
  56   protected FontMetrics metrics;
  57
  58   public PlainView(Element elem)
  59   {
  60     super(elem);
  61   }
  62
  63   /**
  64    * @since 1.4
  65    */
  66   protected void updateMetrics()
  67   {
  68     Component component = getContainer();
  69     Font font = component.getFont();
  70
  71     if (this.font != font)
  72       {
  73         this.font = font;
  74         metrics = component.getFontMetrics(font);
  75       }
  76   }
  77
  78   /**
  79    * @since 1.4
  80    */
  81   protected Rectangle lineToRect(Shape a, int line)
  82   {
  83     // Ensure metrics are up-to-date.
  84     updateMetrics();
  85
  86     Rectangle rect = a.getBounds();
  87     int fontHeight = metrics.getHeight();
  88     return new Rectangle(rect.x, rect.y + (line * fontHeight),
  89                          rect.width, fontHeight);
  90   }
  91
  92   public Shape modelToView(int position, Shape a, Position.Bias b)
  93     throws BadLocationException
  94   {
  95     // Ensure metrics are up-to-date.
  96     updateMetrics();
  97
  98     Document document = getDocument();
  99
 100     // Get rectangle of the line containing position.
 101     int lineIndex = getElement().getElementIndex(position);
 102     Rectangle rect = lineToRect(a, lineIndex);
 103
 104     // Get the rectangle for position.
 105     Element line = getElement().getElement(lineIndex);
 106     int lineStart = line.getStartOffset();
 107     Segment segment = new Segment();
 108     document.getText(lineStart, position - lineStart, segment);
 109     int xoffset = Utilities.getTabbedTextWidth(segment, metrics, rect.x,
 110                                                this, lineStart);
 111
 112     // Calc the real rectangle.
 113     rect.x += xoffset;
 114     rect.width = 1;
 115     rect.height = metrics.getHeight();
 116
 117     return rect;
 118   }
 119
 120   protected void drawLine(int lineIndex, Graphics g, int x, int y)
 121   {
 122     try
 123       {
 124         metrics = g.getFontMetrics();
 125         // FIXME: Selected text are not drawn yet.
 126         Element line = getDocument().getDefaultRootElement().getElement(lineIndex);
 127         drawUnselectedText(g, x, y, line.getStartOffset(), line.getEndOffset());
 128         //drawSelectedText(g, , , , );
 129       }
 130     catch (BadLocationException e)
 131       {
 132         // This should never happen.
 133       }
 134   }
 135
 136   protected int drawSelectedText(Graphics g, int x, int y, int p0, int p1)
 137     throws BadLocationException
 138   {
 139     g.setColor(selectedColor);
 140     Segment segment = new Segment();
 141     getDocument().getText(p0, p1 - p0, segment);
 142     return Utilities.drawTabbedText(segment, x, y, g, this, 0);
 143   }
 144
 145   protected int drawUnselectedText(Graphics g, int x, int y, int p0, int p1)
 146     throws BadLocationException
 147   {
 148     g.setColor(unselectedColor);
 149     Segment segment = new Segment();
 150     getDocument().getText(p0, p1 - p0, segment);
 151     return Utilities.drawTabbedText(segment, x, y, g, this, 0);
 152   }
 153
 154   public void paint(Graphics g, Shape s)
 155   {
 156     // Ensure metrics are up-to-date.
 157     updateMetrics();
 158
 159     JTextComponent textComponent = (JTextComponent) getContainer();
 160
 161     g.setFont(textComponent.getFont());
 162     selectedColor = textComponent.getSelectedTextColor();
 163     unselectedColor = textComponent.getForeground();
 164
 165     Rectangle rect = s.getBounds();
 166
 167     // FIXME: Text may be scrolled.
 168     Document document = textComponent.getDocument();
 169     Element root = document.getDefaultRootElement();
 170     int y = rect.y;
 171
 172     for (int i = 0; i < root.getElementCount(); i++)
 173       {
 174         drawLine(i, g, rect.x, y);
 175         y += metrics.getHeight();
 176       }
 177   }
 178
 179   protected int getTabSize()
 180   {
 181     return 8;
 182   }
 183
 184   /**
 185    * Returns the next tab stop position after a given reference position.
 186    *
 187    * This implementation ignores the <code>tabStop</code> argument.
 188    *
 189    * @param x the current x position in pixels
 190    * @param tabStop the position within the text stream that the tab occured at
 191    */
 192   public float nextTabStop(float x, int tabStop)
 193   {
 194     float tabSizePixels = getTabSize() + metrics.charWidth('m');
 195     return (float) (Math.floor(x / tabSizePixels) + 1) * tabSizePixels;
 196   }
 197
 198   public float getPreferredSpan(int axis)
 199   {
 200     if (axis != X_AXIS && axis != Y_AXIS)
 201       throw new IllegalArgumentException();
 202
 203     return 10;
 204   }
 205 }
 206