1 /*
2 * Copyright (c) 1999, 2017, 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 float x = alloc.x;
102 int p = v.getStartOffset();
103 int[] justificationData = getJustificationData(v);
104 if (p != p0) {
105 text = v.getText(p, p0);
106 float width = Utilities.getTabbedTextWidth(v, text, metrics, x,
107 expander, p,
108 justificationData);
109 x += width;
110 SegmentCache.releaseSharedSegment(text);
111 }
112
113 // determine the y coordinate to render the glyphs
114 float y = alloc.y + metrics.getHeight() - metrics.getDescent();
115
116 // render the glyphs
117 text = v.getText(p0, p1);
118 g.setFont(metrics.getFont());
119
120 Utilities.drawTabbedText(v, text, x, y, g, expander,p0,
121 justificationData, true);
122 SegmentCache.releaseSharedSegment(text);
123 }
124
125 public Shape modelToView(GlyphView v, int pos, Position.Bias bias,
126 Shape a) throws BadLocationException {
127
128 sync(v);
129 Rectangle alloc = (a instanceof Rectangle) ? (Rectangle)a : a.getBounds();
130 int p0 = v.getStartOffset();
131 int p1 = v.getEndOffset();
132 TabExpander expander = v.getTabExpander();
133 Segment text;
134
135 if(pos == p1) {
136 // The caller of this is left to right and borders a right to
137 // left view, return our end location.
138 return new Rectangle(alloc.x + alloc.width, alloc.y, 0,
139 metrics.getHeight());
140 }
141 if ((pos >= p0) && (pos <= p1)) {
142 // determine range to the left of the position
143 text = v.getText(p0, pos);
144 int[] justificationData = getJustificationData(v);
145 int width = Utilities.getTabbedTextWidth(v, text, metrics, alloc.x, expander, p0,
146 justificationData);
147 SegmentCache.releaseSharedSegment(text);
148 return new Rectangle(alloc.x + width, alloc.y, 0, metrics.getHeight());
149 }
150 throw new BadLocationException("modelToView - can't convert", p1);
151 }
152
153 /**
154 * Provides a mapping from the view coordinate space to the logical
155 * coordinate space of the model.
156 *
157 * @param v the view containing the view coordinates
158 * @param x the X coordinate
159 * @param y the Y coordinate
160 * @param a the allocated region to render into
161 * @param biasReturn always returns <code>Position.Bias.Forward</code>
162 * as the zero-th element of this array
163 * @return the location within the model that best represents the
164 * given point in the view
165 * @see View#viewToModel
166 */
167 public int viewToModel(GlyphView v, float x, float y, Shape a,
168 Position.Bias[] biasReturn) {
169
170 sync(v);
171 Rectangle alloc = (a instanceof Rectangle) ? (Rectangle)a : a.getBounds();
172 int p0 = v.getStartOffset();
173 int p1 = v.getEndOffset();
174 TabExpander expander = v.getTabExpander();
175 Segment text = v.getText(p0, p1);
176 int[] justificationData = getJustificationData(v);
177 int offs = Utilities.getTabbedTextOffset(v, text, metrics,
178 alloc.x, (int) x, expander, p0,
179 justificationData);
180 SegmentCache.releaseSharedSegment(text);
181 int retValue = p0 + offs;
182 if(retValue == p1) {
183 // No need to return backward bias as GlyphPainter1 is used for
184 // ltr text only.
185 retValue--;
186 }
187 biasReturn[0] = Position.Bias.Forward;
188 return retValue;
189 }
190
191 /**
192 * Determines the best location (in the model) to break
193 * the given view.
194 * This method attempts to break on a whitespace
195 * location. If a whitespace location can't be found, the
196 * nearest character location is returned.
197 *
198 * @param v the view
199 * @param p0 the location in the model where the
200 * fragment should start its representation >= 0
201 * @param x the graphic location along the axis that the
202 * broken view would occupy >= 0; this may be useful for
203 * things like tab calculations
204 * @param len specifies the distance into the view
205 * where a potential break is desired >= 0
206 * @return the model location desired for a break
207 * @see View#breakView
208 */
209 public int getBoundedPosition(GlyphView v, int p0, float x, float len) {
210 sync(v);
211 TabExpander expander = v.getTabExpander();
212 Segment s = v.getText(p0, v.getEndOffset());
213 int[] justificationData = getJustificationData(v);
214 int index = Utilities.getTabbedTextOffset(v, s, metrics, x, (x+len),
215 expander, p0, false,
216 justificationData, true);
217 SegmentCache.releaseSharedSegment(s);
218 int p1 = p0 + index;
219 return p1;
220 }
221
222 @SuppressWarnings("deprecation")
223 void sync(GlyphView v) {
224 Font f = v.getFont();
225 if ((metrics == null) || (! f.equals(metrics.getFont()))) {
226 // fetch a new FontMetrics
227 Container c = v.getContainer();
228 metrics = (c != null) ? c.getFontMetrics(f) :
229 Toolkit.getDefaultToolkit().getFontMetrics(f);
230 }
231 }
232
233
234
235 /**
236 * @return justificationData from the ParagraphRow this GlyphView
237 * is in or {@code null} if no justification is needed
238 */
239 private int[] getJustificationData(GlyphView v) {
240 View parent = v.getParent();
241 int [] ret = null;
242 if (parent instanceof ParagraphView.Row) {
243 ParagraphView.Row row = ((ParagraphView.Row) parent);
244 ret = row.justificationData;
245 }
246 return ret;
247 }
248
249 // --- variables ---------------------------------------------
250
251 FontMetrics metrics;
252 }