Source for javax.swing.text.FieldView

   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: }