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1
28 package net.sf.jasperreports.engine.fill;
29
30 import java.awt.font.FontRenderContext  ;
31 import java.awt.font.LineBreakMeasurer ;
32 import java.awt.font.TextLayout ;
33 import java.text.AttributedCharacterIterator ;
34 import java.text.AttributedString ;
35 import java.util.StringTokenizer ;
36
37 import net.sf.jasperreports.engine.JRTextElement;
38 import net.sf.jasperreports.engine.export.TextRenderer;
39 import net.sf.jasperreports.engine.util.JRStyledText;
40 import net.sf.jasperreports.engine.util.MaxFontSizeFinder;
41
42
43
47 public class TextMeasurer
48 {
49
50
53 private static final FontRenderContext FONT_RENDER_CONTEXT = TextRenderer.LINE_BREAK_FONT_RENDER_CONTEXT;
54
55
58 private JRTextElement textElement = null;
59
60
61
64 private MaxFontSizeFinder maxFontSizeFinder = null;
65
66 private int width = 0;
67 private int height = 0;
68 private int topPadding = 0;
69 private int leftPadding = 0;
70 private int bottomPadding = 0;
71 private int rightPadding = 0;
72 private float lineSpacing = 0;
73
74 private float formatWidth = 0;
75 private int maxHeight = 0;
76 private int textOffset = 0;
77 private int lines = 0;
78 private int fontSizeSum = 0;
79 private int firstLineMaxFontSize = 0;
80 private float textHeight = 0;
81 private float firstLineLeading = 0;
82 private boolean isLeftToRight = true;
83 private boolean isMaxHeightReached = false;
84
85
86
89 public TextMeasurer(JRTextElement textElement)
90 {
91 this.textElement = textElement;
92 }
93
94
97 private void initialize(int availableStretchHeight)
98 {
99 width = textElement.getWidth();
100 height = textElement.getHeight();
101
102 topPadding = textElement.getTopPadding();
103 leftPadding = textElement.getLeftPadding();
104 bottomPadding = textElement.getBottomPadding();
105 rightPadding = textElement.getRightPadding();
106
107 switch (textElement.getRotation())
108 {
109 case JRTextElement.ROTATION_LEFT :
110 {
111 width = textElement.getHeight();
112 height = textElement.getWidth();
113 int tmpPadding = topPadding;
114 topPadding = leftPadding;
115 leftPadding = bottomPadding;
116 bottomPadding = rightPadding;
117 rightPadding = tmpPadding;
118 break;
119 }
120 case JRTextElement.ROTATION_RIGHT :
121 {
122 width = textElement.getHeight();
123 height = textElement.getWidth();
124 int tmpPadding = topPadding;
125 topPadding = rightPadding;
126 rightPadding = bottomPadding;
127 bottomPadding = leftPadding;
128 leftPadding = tmpPadding;
129 break;
130 }
131 case JRTextElement.ROTATION_UPSIDE_DOWN :
132 {
133 int tmpPadding = topPadding;
134 topPadding = bottomPadding;
135 bottomPadding = tmpPadding;
136 tmpPadding = leftPadding;
137 leftPadding = rightPadding;
138 rightPadding = tmpPadding;
139 break;
140 }
141 case JRTextElement.ROTATION_NONE :
142 default :
143 {
144 }
145 }
146
147
148 switch (textElement.getLineSpacing())
149 {
150 case JRTextElement.LINE_SPACING_SINGLE :
151 {
152 lineSpacing = 1f;
153 break;
154 }
155 case JRTextElement.LINE_SPACING_1_1_2 :
156 {
157 lineSpacing = 1.5f;
158 break;
159 }
160 case JRTextElement.LINE_SPACING_DOUBLE :
161 {
162 lineSpacing = 2f;
163 break;
164 }
165 default :
166 {
167 lineSpacing = 1f;
168 }
169 }
170
171 maxFontSizeFinder = MaxFontSizeFinder.getInstance(textElement.isStyledText());
172
173 formatWidth = width - leftPadding - rightPadding;
174 formatWidth = formatWidth < 0 ? 0 : formatWidth;
175 maxHeight = height + availableStretchHeight - topPadding - bottomPadding;
176 maxHeight = maxHeight < 0 ? 0 : maxHeight;
177 textOffset = 0;
178 lines = 0;
179 fontSizeSum = 0;
180 firstLineMaxFontSize = 0;
181 textHeight = 0;
182 firstLineLeading = 0;
183 isLeftToRight = true;
184 isMaxHeightReached = false;
185 }
186
187
190 public void measure(
191 JRStyledText styledText,
192 String remainingText,
193 int remainingTextStart,
194 int availableStretchHeight
195 )
196 {
197
198 initialize(availableStretchHeight);
199
200 AttributedCharacterIterator allParagraphs = styledText.getAttributedString().getIterator();
201
202 int tokenPosition = remainingTextStart;
203 int lastParagraphStart = remainingTextStart;
204 String lastParagraphText = null;
205
206 StringTokenizer tkzer = new StringTokenizer (remainingText, "\n", true);
207
208 while(tkzer.hasMoreTokens() && !isMaxHeightReached)
209 {
210 String token = tkzer.nextToken();
211
212 if ("\n".equals(token))
213 {
214 renderParagraph(allParagraphs, lastParagraphStart, lastParagraphText);
215
216 lastParagraphStart = tokenPosition + (tkzer.hasMoreTokens() || tokenPosition == 0 ? 1 : 0);
217 lastParagraphText = null;
218 }
219 else
220 {
221 lastParagraphStart = tokenPosition;
222 lastParagraphText = token;
223 }
224
225 tokenPosition += token.length();
226 }
227
228 if (!isMaxHeightReached && lastParagraphStart < remainingTextStart + remainingText.length())
229 {
230 renderParagraph(allParagraphs, lastParagraphStart, lastParagraphText);
231 }
232 }
233
234
237 private void renderParagraph(
238 AttributedCharacterIterator allParagraphs,
239 int lastParagraphStart,
240 String lastParagraphText
241 )
242 {
243 AttributedCharacterIterator paragraph = null;
244
245 if (lastParagraphText == null)
246 {
247 paragraph =
248 new AttributedString (
249 " ",
250 new AttributedString (
251 allParagraphs,
252 lastParagraphStart,
253 lastParagraphStart + 1
254 ).getIterator().getAttributes()
255 ).getIterator();
256 }
257 else
258 {
259 paragraph =
260 new AttributedString (
261 allParagraphs,
262 lastParagraphStart,
263 lastParagraphStart + lastParagraphText.length()
264 ).getIterator();
265 }
266
267 int positionWithinParagraph = 0;
268
269 LineBreakMeasurer lineMeasurer = new LineBreakMeasurer (paragraph, FONT_RENDER_CONTEXT);
270
271 while (lineMeasurer.getPosition() < paragraph.getEndIndex() && !isMaxHeightReached)
272 {
273 int lineStartPosition = lineMeasurer.getPosition();
274
275 TextLayout layout = lineMeasurer.nextLayout(formatWidth);
276
277 isLeftToRight = isLeftToRight && layout.isLeftToRight();
278
279 textHeight += layout.getLeading() + lineSpacing * layout.getAscent();
280
281 if (textHeight + layout.getDescent() <= maxHeight)
282 {
283 lines++;
284
285 fontSizeSum +=
286 maxFontSizeFinder.findMaxFontSize(
287 new AttributedString (
288 paragraph,
289 lineStartPosition,
290 lineStartPosition + layout.getCharacterCount()
291 ).getIterator(),
292 textElement.getFontSize()
293 );
294
295 if (lines == 1)
296 {
297 firstLineLeading = textHeight;
298 firstLineMaxFontSize = fontSizeSum;
299 }
300
301 positionWithinParagraph = lineMeasurer.getPosition();
302 textHeight += layout.getDescent();
306 }
307 else
308 {
309 textHeight -= layout.getLeading() + lineSpacing * layout.getAscent();
310 isMaxHeightReached = true;
311 }
312 }
313
314 textOffset = lastParagraphStart + positionWithinParagraph; }
316
317
318
321 protected boolean isLeftToRight()
322 {
323 return isLeftToRight;
324 }
325
326
329 protected int getTextOffset()
330 {
331 return textOffset;
332 }
333
334
337 public float getTextHeight()
338 {
339 return textHeight;
340 }
341
342
345 public float getLineSpacingFactor()
346 {
347 if (lines > 0)
348 {
349 return textHeight / fontSizeSum;
350 }
351 return 0;
352 }
353
354
357 public float getLeadingOffset()
358 {
359 return firstLineLeading - firstLineMaxFontSize * getLineSpacingFactor();
360 }
361
362 }
363 |
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