001 /* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors.
006 *
007 * Project Info: http://www.jfree.org/jfreechart/index.html
008 *
009 * This library is free software; you can redistribute it and/or modify it
010 * under the terms of the GNU Lesser General Public License as published by
011 * the Free Software Foundation; either version 2.1 of the License, or
012 * (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but
015 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
016 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
017 * License for more details.
018 *
019 * You should have received a copy of the GNU Lesser General Public
020 * License along with this library; if not, write to the Free Software
021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
022 * USA.
023 *
024 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
025 * in the United States and other countries.]
026 *
027 * --------------------
028 * FlowArrangement.java
029 * --------------------
030 * (C) Copyright 2004-2007, by Object Refinery Limited.
031 *
032 * Original Author: David Gilbert (for Object Refinery Limited);
033 * Contributor(s): -;
034 *
035 * Changes:
036 * --------
037 * 22-Oct-2004 : Version 1 (DG);
038 * 04-Feb-2005 : Implemented equals() and made serializable (DG);
039 * 08-Feb-2005 : Updated for changes in RectangleConstraint (DG);
040 *
041 */
042
043 package org.jfree.chart.block;
044
045 import java.awt.Graphics2D;
046 import java.awt.geom.Rectangle2D;
047 import java.io.Serializable;
048 import java.util.ArrayList;
049 import java.util.List;
050
051 import org.jfree.ui.HorizontalAlignment;
052 import org.jfree.ui.Size2D;
053 import org.jfree.ui.VerticalAlignment;
054
055 /**
056 * Arranges blocks in a flow layout. This class is immutable.
057 */
058 public class FlowArrangement implements Arrangement, Serializable {
059
060 /** For serialization. */
061 private static final long serialVersionUID = 4543632485478613800L;
062
063 /** The horizontal alignment of blocks. */
064 private HorizontalAlignment horizontalAlignment;
065
066 /** The vertical alignment of blocks within each row. */
067 private VerticalAlignment verticalAlignment;
068
069 /** The horizontal gap between items within rows. */
070 private double horizontalGap;
071
072 /** The vertical gap between rows. */
073 private double verticalGap;
074
075 /**
076 * Creates a new instance.
077 */
078 public FlowArrangement() {
079 this(HorizontalAlignment.CENTER, VerticalAlignment.CENTER, 2.0, 2.0);
080 }
081
082 /**
083 * Creates a new instance.
084 *
085 * @param hAlign the horizontal alignment (currently ignored).
086 * @param vAlign the vertical alignment (currently ignored).
087 * @param hGap the horizontal gap.
088 * @param vGap the vertical gap.
089 */
090 public FlowArrangement(HorizontalAlignment hAlign, VerticalAlignment vAlign,
091 double hGap, double vGap) {
092 this.horizontalAlignment = hAlign;
093 this.verticalAlignment = vAlign;
094 this.horizontalGap = hGap;
095 this.verticalGap = vGap;
096 }
097
098 /**
099 * Adds a block to be managed by this instance. This method is usually
100 * called by the {@link BlockContainer}, you shouldn't need to call it
101 * directly.
102 *
103 * @param block the block.
104 * @param key a key that controls the position of the block.
105 */
106 public void add(Block block, Object key) {
107 // since the flow layout is relatively straightforward,
108 // no information needs to be recorded here
109 }
110
111 /**
112 * Calculates and sets the bounds of all the items in the specified
113 * container, subject to the given constraint. The <code>Graphics2D</code>
114 * can be used by some items (particularly items containing text) to
115 * calculate sizing parameters.
116 *
117 * @param container the container whose items are being arranged.
118 * @param constraint the size constraint.
119 * @param g2 the graphics device.
120 *
121 * @return The size of the container after arrangement of the contents.
122 */
123 public Size2D arrange(BlockContainer container, Graphics2D g2,
124 RectangleConstraint constraint) {
125
126 LengthConstraintType w = constraint.getWidthConstraintType();
127 LengthConstraintType h = constraint.getHeightConstraintType();
128 if (w == LengthConstraintType.NONE) {
129 if (h == LengthConstraintType.NONE) {
130 return arrangeNN(container, g2);
131 }
132 else if (h == LengthConstraintType.FIXED) {
133 return arrangeNF(container, g2, constraint);
134 }
135 else if (h == LengthConstraintType.RANGE) {
136 throw new RuntimeException("Not implemented.");
137 }
138 }
139 else if (w == LengthConstraintType.FIXED) {
140 if (h == LengthConstraintType.NONE) {
141 return arrangeFN(container, g2, constraint);
142 }
143 else if (h == LengthConstraintType.FIXED) {
144 return arrangeFF(container, g2, constraint);
145 }
146 else if (h == LengthConstraintType.RANGE) {
147 return arrangeFR(container, g2, constraint);
148 }
149 }
150 else if (w == LengthConstraintType.RANGE) {
151 if (h == LengthConstraintType.NONE) {
152 return arrangeRN(container, g2, constraint);
153 }
154 else if (h == LengthConstraintType.FIXED) {
155 return arrangeRF(container, g2, constraint);
156 }
157 else if (h == LengthConstraintType.RANGE) {
158 return arrangeRR(container, g2, constraint);
159 }
160 }
161 throw new RuntimeException("Unrecognised constraint type.");
162
163 }
164
165 /**
166 * Arranges the blocks in the container with a fixed width and no height
167 * constraint.
168 *
169 * @param container the container.
170 * @param constraint the constraint.
171 * @param g2 the graphics device.
172 *
173 * @return The size.
174 */
175 protected Size2D arrangeFN(BlockContainer container, Graphics2D g2,
176 RectangleConstraint constraint) {
177
178 List blocks = container.getBlocks();
179 double width = constraint.getWidth();
180
181 double x = 0.0;
182 double y = 0.0;
183 double maxHeight = 0.0;
184 List itemsInRow = new ArrayList();
185 for (int i = 0; i < blocks.size(); i++) {
186 Block block = (Block) blocks.get(i);
187 Size2D size = block.arrange(g2, RectangleConstraint.NONE);
188 if (x + size.width <= width) {
189 itemsInRow.add(block);
190 block.setBounds(
191 new Rectangle2D.Double(x, y, size.width, size.height)
192 );
193 x = x + size.width + this.horizontalGap;
194 maxHeight = Math.max(maxHeight, size.height);
195 }
196 else {
197 if (itemsInRow.isEmpty()) {
198 // place in this row (truncated) anyway
199 block.setBounds(
200 new Rectangle2D.Double(
201 x, y, Math.min(size.width, width - x), size.height
202 )
203 );
204 x = 0.0;
205 y = y + size.height + this.verticalGap;
206 }
207 else {
208 // start new row
209 itemsInRow.clear();
210 x = 0.0;
211 y = y + maxHeight + this.verticalGap;
212 maxHeight = size.height;
213 block.setBounds(
214 new Rectangle2D.Double(
215 x, y, Math.min(size.width, width), size.height
216 )
217 );
218 x = size.width + this.horizontalGap;
219 itemsInRow.add(block);
220 }
221 }
222 }
223 return new Size2D(constraint.getWidth(), y + maxHeight);
224 }
225
226 /**
227 * Arranges the blocks in the container with a fixed width and a range
228 * constraint on the height.
229 *
230 * @param container the container.
231 * @param constraint the constraint.
232 * @param g2 the graphics device.
233 *
234 * @return The size following the arrangement.
235 */
236 protected Size2D arrangeFR(BlockContainer container, Graphics2D g2,
237 RectangleConstraint constraint) {
238
239 Size2D s = arrangeFN(container, g2, constraint);
240 if (constraint.getHeightRange().contains(s.height)) {
241 return s;
242 }
243 else {
244 RectangleConstraint c = constraint.toFixedHeight(
245 constraint.getHeightRange().constrain(s.getHeight())
246 );
247 return arrangeFF(container, g2, c);
248 }
249 }
250
251 /**
252 * Arranges the blocks in the container with the overall height and width
253 * specified as fixed constraints.
254 *
255 * @param container the container.
256 * @param constraint the constraint.
257 * @param g2 the graphics device.
258 *
259 * @return The size following the arrangement.
260 */
261 protected Size2D arrangeFF(BlockContainer container, Graphics2D g2,
262 RectangleConstraint constraint) {
263
264 // TODO: implement this properly
265 return arrangeFN(container, g2, constraint);
266 }
267
268 /**
269 * Arranges the blocks with the overall width and height to fit within
270 * specified ranges.
271 *
272 * @param container the container.
273 * @param constraint the constraint.
274 * @param g2 the graphics device.
275 *
276 * @return The size after the arrangement.
277 */
278 protected Size2D arrangeRR(BlockContainer container, Graphics2D g2,
279 RectangleConstraint constraint) {
280
281 // first arrange without constraints, and see if this fits within
282 // the required ranges...
283 Size2D s1 = arrangeNN(container, g2);
284 if (constraint.getWidthRange().contains(s1.width)) {
285 return s1; // TODO: we didn't check the height yet
286 }
287 else {
288 RectangleConstraint c = constraint.toFixedWidth(
289 constraint.getWidthRange().getUpperBound()
290 );
291 return arrangeFR(container, g2, c);
292 }
293 }
294
295 /**
296 * Arranges the blocks in the container with a range constraint on the
297 * width and a fixed height.
298 *
299 * @param container the container.
300 * @param constraint the constraint.
301 * @param g2 the graphics device.
302 *
303 * @return The size following the arrangement.
304 */
305 protected Size2D arrangeRF(BlockContainer container, Graphics2D g2,
306 RectangleConstraint constraint) {
307
308 Size2D s = arrangeNF(container, g2, constraint);
309 if (constraint.getWidthRange().contains(s.width)) {
310 return s;
311 }
312 else {
313 RectangleConstraint c = constraint.toFixedWidth(
314 constraint.getWidthRange().constrain(s.getWidth())
315 );
316 return arrangeFF(container, g2, c);
317 }
318 }
319
320 /**
321 * Arranges the block with a range constraint on the width, and no
322 * constraint on the height.
323 *
324 * @param container the container.
325 * @param constraint the constraint.
326 * @param g2 the graphics device.
327 *
328 * @return The size following the arrangement.
329 */
330 protected Size2D arrangeRN(BlockContainer container, Graphics2D g2,
331 RectangleConstraint constraint) {
332 // first arrange without constraints, then see if the width fits
333 // within the required range...if not, call arrangeFN() at max width
334 Size2D s1 = arrangeNN(container, g2);
335 if (constraint.getWidthRange().contains(s1.width)) {
336 return s1;
337 }
338 else {
339 RectangleConstraint c = constraint.toFixedWidth(
340 constraint.getWidthRange().getUpperBound()
341 );
342 return arrangeFN(container, g2, c);
343 }
344 }
345
346 /**
347 * Arranges the blocks without any constraints. This puts all blocks
348 * into a single row.
349 *
350 * @param container the container.
351 * @param g2 the graphics device.
352 *
353 * @return The size after the arrangement.
354 */
355 protected Size2D arrangeNN(BlockContainer container, Graphics2D g2) {
356 double x = 0.0;
357 double width = 0.0;
358 double maxHeight = 0.0;
359 List blocks = container.getBlocks();
360 int blockCount = blocks.size();
361 if (blockCount > 0) {
362 Size2D[] sizes = new Size2D[blocks.size()];
363 for (int i = 0; i < blocks.size(); i++) {
364 Block block = (Block) blocks.get(i);
365 sizes[i] = block.arrange(g2, RectangleConstraint.NONE);
366 width = width + sizes[i].getWidth();
367 maxHeight = Math.max(sizes[i].height, maxHeight);
368 block.setBounds(
369 new Rectangle2D.Double(
370 x, 0.0, sizes[i].width, sizes[i].height
371 )
372 );
373 x = x + sizes[i].width + this.horizontalGap;
374 }
375 if (blockCount > 1) {
376 width = width + this.horizontalGap * (blockCount - 1);
377 }
378 if (this.verticalAlignment != VerticalAlignment.TOP) {
379 for (int i = 0; i < blocks.size(); i++) {
380 //Block b = (Block) blocks.get(i);
381 if (this.verticalAlignment == VerticalAlignment.CENTER) {
382 //TODO: shift block down by half
383 }
384 else if (this.verticalAlignment
385 == VerticalAlignment.BOTTOM) {
386 //TODO: shift block down to bottom
387 }
388 }
389 }
390 }
391 return new Size2D(width, maxHeight);
392 }
393
394 /**
395 * Arranges the blocks with no width constraint and a fixed height
396 * constraint. This puts all blocks into a single row.
397 *
398 * @param container the container.
399 * @param constraint the constraint.
400 * @param g2 the graphics device.
401 *
402 * @return The size after the arrangement.
403 */
404 protected Size2D arrangeNF(BlockContainer container, Graphics2D g2,
405 RectangleConstraint constraint) {
406 // TODO: for now we are ignoring the height constraint
407 return arrangeNN(container, g2);
408 }
409
410 /**
411 * Clears any cached information.
412 */
413 public void clear() {
414 // no action required.
415 }
416
417 /**
418 * Tests this instance for equality with an arbitrary object.
419 *
420 * @param obj the object (<code>null</code> permitted).
421 *
422 * @return A boolean.
423 */
424 public boolean equals(Object obj) {
425 if (obj == this) {
426 return true;
427 }
428 if (!(obj instanceof FlowArrangement)) {
429 return false;
430 }
431 FlowArrangement that = (FlowArrangement) obj;
432 if (this.horizontalAlignment != that.horizontalAlignment) {
433 return false;
434 }
435 if (this.verticalAlignment != that.verticalAlignment) {
436 return false;
437 }
438 if (this.horizontalGap != that.horizontalGap) {
439 return false;
440 }
441 if (this.verticalGap != that.verticalGap) {
442 return false;
443 }
444 return true;
445 }
446
447 }