1 /* 2 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 package javax.swing.text; 26 27 import java.awt.*; 28 29 /** 30 * A class to perform rendering of the glyphs. 31 * This can be implemented to be stateless, or 32 * to hold some information as a cache to 33 * facilitate faster rendering and model/view 34 * translation. At a minimum, the GlyphPainter 35 * allows a View implementation to perform its 36 * duties independent of a particular version 37 * of JVM and selection of capabilities (i.e. 38 * shaping for i18n, etc). 39 * <p> 40 * This implementation is intended for operation 41 * under the JDK1.1 API of the Java Platform. 42 * Since the JDK is backward compatible with 43 * JDK1.1 API, this class will also function on 44 * Java 2. The JDK introduces improved 45 * API for rendering text however, so the GlyphPainter2 46 * is recommended for the DK. 47 * 48 * @author Timothy Prinzing 49 * @see GlyphView 50 */ 51 class GlyphPainter1 extends GlyphView.GlyphPainter { 52 53 /** 54 * Determine the span the glyphs given a start location 55 * (for tab expansion). 56 */ 57 public float getSpan(GlyphView v, int p0, int p1, 58 TabExpander e, float x) { 59 sync(v); 60 Segment text = v.getText(p0, p1); 61 int[] justificationData = getJustificationData(v); 62 int width = Utilities.getTabbedTextWidth(v, text, metrics, (int) x, e, p0, 63 justificationData); 64 SegmentCache.releaseSharedSegment(text); 65 return width; 66 } 67 68 public float getHeight(GlyphView v) { 69 sync(v); 70 return metrics.getHeight(); 71 } 72 73 /** 74 * Fetches the ascent above the baseline for the glyphs 75 * corresponding to the given range in the model. 76 */ 77 public float getAscent(GlyphView v) { 78 sync(v); 79 return metrics.getAscent(); 80 } 81 82 /** 83 * Fetches the descent below the baseline for the glyphs 84 * corresponding to the given range in the model. 85 */ 86 public float getDescent(GlyphView v) { 87 sync(v); 88 return metrics.getDescent(); 89 } 90 91 /** 92 * Paints the glyphs representing the given range. 93 */ 94 public void paint(GlyphView v, Graphics g, Shape a, int p0, int p1) { 95 sync(v); 96 Segment text; 97 TabExpander expander = v.getTabExpander(); 98 Rectangle alloc = (a instanceof Rectangle) ? (Rectangle)a : a.getBounds(); 99 100 // determine the x coordinate to render the glyphs 101 int x = alloc.x; 102 int p = v.getStartOffset(); 103 int[] justificationData = getJustificationData(v); 104 if (p != p0) { 105 text = v.getText(p, p0); 106 int width = Utilities.getTabbedTextWidth(v, text, metrics, x, expander, p, 107 justificationData); 108 x += width; 109 SegmentCache.releaseSharedSegment(text); 110 } 111 112 // determine the y coordinate to render the glyphs 113 int y = alloc.y + metrics.getHeight() - metrics.getDescent(); 114 115 // render the glyphs 116 text = v.getText(p0, p1); 117 g.setFont(metrics.getFont()); 118 119 Utilities.drawTabbedText(v, text, x, y, g, expander,p0, 120 justificationData); 121 SegmentCache.releaseSharedSegment(text); 122 } 123 124 public Shape modelToView(GlyphView v, int pos, Position.Bias bias, 125 Shape a) throws BadLocationException { 126 127 sync(v); 128 Rectangle alloc = (a instanceof Rectangle) ? (Rectangle)a : a.getBounds(); 129 int p0 = v.getStartOffset(); 130 int p1 = v.getEndOffset(); 131 TabExpander expander = v.getTabExpander(); 132 Segment text; 133 134 if(pos == p1) { 135 // The caller of this is left to right and borders a right to 136 // left view, return our end location. 137 return new Rectangle(alloc.x + alloc.width, alloc.y, 0, 138 metrics.getHeight()); 139 } 140 if ((pos >= p0) && (pos <= p1)) { 141 // determine range to the left of the position 142 text = v.getText(p0, pos); 143 int[] justificationData = getJustificationData(v); 144 int width = Utilities.getTabbedTextWidth(v, text, metrics, alloc.x, expander, p0, 145 justificationData); 146 SegmentCache.releaseSharedSegment(text); 147 return new Rectangle(alloc.x + width, alloc.y, 0, metrics.getHeight()); 148 } 149 throw new BadLocationException("modelToView - can't convert", p1); 150 } 151 152 /** 153 * Provides a mapping from the view coordinate space to the logical 154 * coordinate space of the model. 155 * 156 * @param v the view containing the view coordinates 157 * @param x the X coordinate 158 * @param y the Y coordinate 159 * @param a the allocated region to render into 160 * @param biasReturn always returns <code>Position.Bias.Forward</code> 161 * as the zero-th element of this array 162 * @return the location within the model that best represents the 163 * given point in the view 164 * @see View#viewToModel 165 */ 166 public int viewToModel(GlyphView v, float x, float y, Shape a, 167 Position.Bias[] biasReturn) { 168 169 sync(v); 170 Rectangle alloc = (a instanceof Rectangle) ? (Rectangle)a : a.getBounds(); 171 int p0 = v.getStartOffset(); 172 int p1 = v.getEndOffset(); 173 TabExpander expander = v.getTabExpander(); 174 Segment text = v.getText(p0, p1); 175 int[] justificationData = getJustificationData(v); 176 int offs = Utilities.getTabbedTextOffset(v, text, metrics, 177 alloc.x, (int) x, expander, p0, 178 justificationData); 179 SegmentCache.releaseSharedSegment(text); 180 int retValue = p0 + offs; 181 if(retValue == p1) { 182 // No need to return backward bias as GlyphPainter1 is used for 183 // ltr text only. 184 retValue--; 185 } 186 biasReturn[0] = Position.Bias.Forward; 187 return retValue; 188 } 189 190 /** 191 * Determines the best location (in the model) to break 192 * the given view. 193 * This method attempts to break on a whitespace 194 * location. If a whitespace location can't be found, the 195 * nearest character location is returned. 196 * 197 * @param v the view 198 * @param p0 the location in the model where the 199 * fragment should start its representation >= 0 200 * @param pos the graphic location along the axis that the 201 * broken view would occupy >= 0; this may be useful for 202 * things like tab calculations 203 * @param len specifies the distance into the view 204 * where a potential break is desired >= 0 205 * @return the model location desired for a break 206 * @see View#breakView 207 */ 208 public int getBoundedPosition(GlyphView v, int p0, float x, float len) { 209 sync(v); 210 TabExpander expander = v.getTabExpander(); 211 Segment s = v.getText(p0, v.getEndOffset()); 212 int[] justificationData = getJustificationData(v); 213 int index = Utilities.getTabbedTextOffset(v, s, metrics, (int)x, (int)(x+len), 214 expander, p0, false, 215 justificationData); 216 SegmentCache.releaseSharedSegment(s); 217 int p1 = p0 + index; 218 return p1; 219 } 220 221 @SuppressWarnings("deprecation") 222 void sync(GlyphView v) { 223 Font f = v.getFont(); 224 if ((metrics == null) || (! f.equals(metrics.getFont()))) { 225 // fetch a new FontMetrics 226 Container c = v.getContainer(); 227 metrics = (c != null) ? c.getFontMetrics(f) : 228 Toolkit.getDefaultToolkit().getFontMetrics(f); 229 } 230 } 231 232 233 234 /** 235 * @return justificationData from the ParagraphRow this GlyphView 236 * is in or {@code null} if no justification is needed 237 */ 238 private int[] getJustificationData(GlyphView v) { 239 View parent = v.getParent(); 240 int [] ret = null; 241 if (parent instanceof ParagraphView.Row) { 242 ParagraphView.Row row = ((ParagraphView.Row) parent); 243 ret = row.justificationData; 244 } 245 return ret; 246 } 247 248 // --- variables --------------------------------------------- 249 250 FontMetrics metrics; 251 }