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author John Reimer <terminal.node@gmail.com
date Sun, 20 Jan 2008 21:50:55 -0800
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1 /*******************************************************************************
2 * Copyright (c) 2000, 2007 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 * Port to the D programming language:
11 * Frank Benoit <benoit@tionex.de>
12 *******************************************************************************/
13 module dwt.layout.GridLayout;
14
15 import dwt.layout.GridData;
16 import dwt.DWT;
17 import dwt.graphics.Point;
18 import dwt.graphics.Rectangle;
19 import dwt.widgets.Control;
20 import dwt.widgets.Composite;
21 import dwt.widgets.Layout;
22 import dwt.widgets.Scrollable;
23
24 import dwt.dwthelper.System;
25 import dwt.dwthelper.Integer;
26
27 import tango.text.Util;
28 import tango.util.Convert;
29 import Math = tango.math.Math;
30
31
32 /**
33 * Instances of this class lay out the control children of a
34 * <code>Composite</code> in a grid.
35 * <p>
36 * <code>GridLayout</code> has a number of configuration fields, and the
37 * controls it lays out can have an associated layout data object, called
38 * <code>GridData</code>. The power of <code>GridLayout</code> lies in the
39 * ability to configure <code>GridData</code> for each control in the layout.
40 * </p>
41 * <p>
42 * The following code creates a shell managed by a <code>GridLayout</code>
43 * with 3 columns:
44 * <pre>
45 * Display display = new Display();
46 * Shell shell = new Shell(display);
47 * GridLayout gridLayout = new GridLayout();
48 * gridLayout.numColumns = 3;
49 * shell.setLayout(gridLayout);
50 * </pre>
51 * The <code>numColumns</code> field is the most important field in a
52 * <code>GridLayout</code>. Widgets are laid out in columns from left
53 * to right, and a new row is created when <code>numColumns</code> + 1
54 * controls are added to the <code>Composite<code>.
55 * </p>
56 *
57 * @see GridData
58 */
59 public final class GridLayout : Layout {
60
61 /**
62 * numColumns specifies the number of cell columns in the layout.
63 * If numColumns has a value less than 1, the layout will not
64 * set the size and position of any controls.
65 *
66 * The default value is 1.
67 */
68 public int numColumns = 1;
69
70 /**
71 * makeColumnsEqualWidth specifies whether all columns in the layout
72 * will be forced to have the same width.
73 *
74 * The default value is false.
75 */
76 public bool makeColumnsEqualWidth = false;
77
78 /**
79 * marginWidth specifies the number of pixels of horizontal margin
80 * that will be placed along the left and right edges of the layout.
81 *
82 * The default value is 5.
83 */
84 public int marginWidth = 5;
85
86 /**
87 * marginHeight specifies the number of pixels of vertical margin
88 * that will be placed along the top and bottom edges of the layout.
89 *
90 * The default value is 5.
91 */
92 public int marginHeight = 5;
93
94 /**
95 * marginLeft specifies the number of pixels of horizontal margin
96 * that will be placed along the left edge of the layout.
97 *
98 * The default value is 0.
99 *
100 * @since 3.1
101 */
102 public int marginLeft = 0;
103
104 /**
105 * marginTop specifies the number of pixels of vertical margin
106 * that will be placed along the top edge of the layout.
107 *
108 * The default value is 0.
109 *
110 * @since 3.1
111 */
112 public int marginTop = 0;
113
114 /**
115 * marginRight specifies the number of pixels of horizontal margin
116 * that will be placed along the right edge of the layout.
117 *
118 * The default value is 0.
119 *
120 * @since 3.1
121 */
122 public int marginRight = 0;
123
124 /**
125 * marginBottom specifies the number of pixels of vertical margin
126 * that will be placed along the bottom edge of the layout.
127 *
128 * The default value is 0.
129 *
130 * @since 3.1
131 */
132 public int marginBottom = 0;
133
134 /**
135 * horizontalSpacing specifies the number of pixels between the right
136 * edge of one cell and the left edge of its neighbouring cell to
137 * the right.
138 *
139 * The default value is 5.
140 */
141 public int horizontalSpacing = 5;
142
143 /**
144 * verticalSpacing specifies the number of pixels between the bottom
145 * edge of one cell and the top edge of its neighbouring cell underneath.
146 *
147 * The default value is 5.
148 */
149 public int verticalSpacing = 5;
150
151 /**
152 * Constructs a new instance of this class.
153 */
154 public this () {}
155
156 /**
157 * Constructs a new instance of this class given the
158 * number of columns, and whether or not the columns
159 * should be forced to have the same width.
160 * If numColumns has a value less than 1, the layout will not
161 * set the size and position of any controls.
162 *
163 * @param numColumns the number of columns in the grid
164 * @param makeColumnsEqualWidth whether or not the columns will have equal width
165 *
166 * @since 2.0
167 */
168 public this (int numColumns, bool makeColumnsEqualWidth) {
169 this.numColumns = numColumns;
170 this.makeColumnsEqualWidth = makeColumnsEqualWidth;
171 }
172
173 protected Point computeSize (Composite composite, int wHint, int hHint, bool flushCache_) {
174 Point size = layout (composite, false, 0, 0, wHint, hHint, flushCache_);
175 if (wHint !is DWT.DEFAULT) size.x = wHint;
176 if (hHint !is DWT.DEFAULT) size.y = hHint;
177 return size;
178 }
179
180 protected bool flushCache (Control control) {
181 Object data = control.getLayoutData ();
182 if (data !is null) (cast(GridData) data).flushCache ();
183 return true;
184 }
185
186 GridData getData (Control [][] grid, int row, int column, int rowCount, int columnCount, bool first) {
187 Control control = grid [row] [column];
188 if (control !is null) {
189 GridData data = cast(GridData) control.getLayoutData ();
190 int hSpan = Math.max (1, Math.min (data.horizontalSpan, columnCount));
191 int vSpan = Math.max (1, data.verticalSpan);
192 int i = first ? row + vSpan - 1 : row - vSpan + 1;
193 int j = first ? column + hSpan - 1 : column - hSpan + 1;
194 if (0 <= i && i < rowCount) {
195 if (0 <= j && j < columnCount) {
196 if (control is grid [i][j]) return data;
197 }
198 }
199 }
200 return null;
201 }
202
203 protected void layout (Composite composite, bool flushCache_) {
204 Rectangle rect = composite.getClientArea ();
205 layout (composite, true, rect.x, rect.y, rect.width, rect.height, flushCache_);
206 }
207
208 Point layout (Composite composite, bool move, int x, int y, int width, int height, bool flushCache_) {
209 if (numColumns < 1) {
210 return new Point (marginLeft + marginWidth * 2 + marginRight, marginTop + marginHeight * 2 + marginBottom);
211 }
212 Control [] children = composite.getChildren ();
213 int count = 0;
214 for (int i=0; i<children.length; i++) {
215 Control control = children [i];
216 GridData data = cast(GridData) control.getLayoutData ();
217 if (data is null || !data.exclude) {
218 children [count++] = children [i];
219 }
220 }
221 if (count is 0) {
222 return new Point (marginLeft + marginWidth * 2 + marginRight, marginTop + marginHeight * 2 + marginBottom);
223 }
224 for (int i=0; i<count; i++) {
225 Control child = children [i];
226 GridData data = cast(GridData) child.getLayoutData ();
227 if (data is null) child.setLayoutData (data = new GridData ());
228 if (flushCache_) data.flushCache ();
229 data.computeSize (child, data.widthHint, data.heightHint, flushCache_);
230 if (data.grabExcessHorizontalSpace && data.minimumWidth > 0) {
231 if (data.cacheWidth < data.minimumWidth) {
232 int trim = 0;
233 //TEMPORARY CODE
234 if ( auto sa = cast(Scrollable)child ) {
235 Rectangle rect = sa.computeTrim (0, 0, 0, 0);
236 trim = rect.width;
237 } else {
238 trim = child.getBorderWidth () * 2;
239 }
240 data.cacheWidth = data.cacheHeight = DWT.DEFAULT;
241 data.computeSize (child, Math.max (0, data.minimumWidth - trim), data.heightHint, false);
242 }
243 }
244 if (data.grabExcessVerticalSpace && data.minimumHeight > 0) {
245 data.cacheHeight = Math.max (data.cacheHeight, data.minimumHeight);
246 }
247 }
248
249 /* Build the grid */
250 int row = 0, column = 0, rowCount = 0, columnCount = numColumns;
251 Control [][] grid = new Control [][]( 4, columnCount );
252 for (int i=0; i<count; i++) {
253 Control child = children [i];
254 GridData data = cast(GridData) child.getLayoutData ();
255 int hSpan = Math.max (1, Math.min (data.horizontalSpan, columnCount));
256 int vSpan = Math.max (1, data.verticalSpan);
257 while (true) {
258 int lastRow = row + vSpan;
259 if (lastRow >= grid.length) {
260 Control [][] newGrid = new Control[][]( lastRow + 4, columnCount );
261 SimpleType!(Control[]).arraycopy (grid, 0, newGrid, 0, grid.length);
262 grid = newGrid;
263 }
264 if (grid [row] is null) {
265 grid [row] = new Control [columnCount];
266 }
267 while (column < columnCount && grid [row] [column] !is null) {
268 column++;
269 }
270 int endCount = column + hSpan;
271 if (endCount <= columnCount) {
272 int index = column;
273 while (index < endCount && grid [row] [index] is null) {
274 index++;
275 }
276 if (index is endCount) break;
277 column = index;
278 }
279 if (column + hSpan >= columnCount) {
280 column = 0;
281 row++;
282 }
283 }
284 for (int j=0; j<vSpan; j++) {
285 if (grid [row + j] is null) {
286 grid [row + j] = new Control [columnCount];
287 }
288 for (int k=0; k<hSpan; k++) {
289 grid [row + j] [column + k] = child;
290 }
291 }
292 rowCount = Math.max (rowCount, row + vSpan);
293 column += hSpan;
294 }
295
296 /* Column widths */
297 int availableWidth = width - horizontalSpacing * (columnCount - 1) - (marginLeft + marginWidth * 2 + marginRight);
298 int expandCount = 0;
299 int [] widths = new int [columnCount];
300 int [] minWidths = new int [columnCount];
301 bool [] expandColumn = new bool [columnCount];
302 for (int j=0; j<columnCount; j++) {
303 for (int i=0; i<rowCount; i++) {
304 GridData data = getData (grid, i, j, rowCount, columnCount, true);
305 if (data !is null) {
306 int hSpan = Math.max (1, Math.min (data.horizontalSpan, columnCount));
307 if (hSpan is 1) {
308 int w = data.cacheWidth + data.horizontalIndent;
309 widths [j] = Math.max (widths [j], w);
310 if (data.grabExcessHorizontalSpace) {
311 if (!expandColumn [j]) expandCount++;
312 expandColumn [j] = true;
313 }
314 if (!data.grabExcessHorizontalSpace || data.minimumWidth !is 0) {
315 w = !data.grabExcessHorizontalSpace || data.minimumWidth is DWT.DEFAULT ? data.cacheWidth : data.minimumWidth;
316 w += data.horizontalIndent;
317 minWidths [j] = Math.max (minWidths [j], w);
318 }
319 }
320 }
321 }
322 for (int i=0; i<rowCount; i++) {
323 GridData data = getData (grid, i, j, rowCount, columnCount, false);
324 if (data !is null) {
325 int hSpan = Math.max (1, Math.min (data.horizontalSpan, columnCount));
326 if (hSpan > 1) {
327 int spanWidth = 0, spanMinWidth = 0, spanExpandCount = 0;
328 for (int k=0; k<hSpan; k++) {
329 spanWidth += widths [j-k];
330 spanMinWidth += minWidths [j-k];
331 if (expandColumn [j-k]) spanExpandCount++;
332 }
333 if (data.grabExcessHorizontalSpace && spanExpandCount is 0) {
334 expandCount++;
335 expandColumn [j] = true;
336 }
337 int w = data.cacheWidth + data.horizontalIndent - spanWidth - (hSpan - 1) * horizontalSpacing;
338 if (w > 0) {
339 if (makeColumnsEqualWidth) {
340 int equalWidth = (w + spanWidth) / hSpan;
341 int remainder = (w + spanWidth) % hSpan, last = -1;
342 for (int k = 0; k < hSpan; k++) {
343 widths [last=j-k] = Math.max (equalWidth, widths [j-k]);
344 }
345 if (last > -1) widths [last] += remainder;
346 } else {
347 if (spanExpandCount is 0) {
348 widths [j] += w;
349 } else {
350 int delta = w / spanExpandCount;
351 int remainder = w % spanExpandCount, last = -1;
352 for (int k = 0; k < hSpan; k++) {
353 if (expandColumn [j-k]) {
354 widths [last=j-k] += delta;
355 }
356 }
357 if (last > -1) widths [last] += remainder;
358 }
359 }
360 }
361 if (!data.grabExcessHorizontalSpace || data.minimumWidth !is 0) {
362 w = !data.grabExcessHorizontalSpace || data.minimumWidth is DWT.DEFAULT ? data.cacheWidth : data.minimumWidth;
363 w += data.horizontalIndent - spanMinWidth - (hSpan - 1) * horizontalSpacing;
364 if (w > 0) {
365 if (spanExpandCount is 0) {
366 minWidths [j] += w;
367 } else {
368 int delta = w / spanExpandCount;
369 int remainder = w % spanExpandCount, last = -1;
370 for (int k = 0; k < hSpan; k++) {
371 if (expandColumn [j-k]) {
372 minWidths [last=j-k] += delta;
373 }
374 }
375 if (last > -1) minWidths [last] += remainder;
376 }
377 }
378 }
379 }
380 }
381 }
382 }
383 if (makeColumnsEqualWidth) {
384 int minColumnWidth = 0;
385 int columnWidth = 0;
386 for (int i=0; i<columnCount; i++) {
387 minColumnWidth = Math.max (minColumnWidth, minWidths [i]);
388 columnWidth = Math.max (columnWidth, widths [i]);
389 }
390 columnWidth = width is DWT.DEFAULT || expandCount is 0 ? columnWidth : Math.max (minColumnWidth, availableWidth / columnCount);
391 for (int i=0; i<columnCount; i++) {
392 expandColumn [i] = expandCount > 0;
393 widths [i] = columnWidth;
394 }
395 } else {
396 if (width !is DWT.DEFAULT && expandCount > 0) {
397 int totalWidth = 0;
398 for (int i=0; i<columnCount; i++) {
399 totalWidth += widths [i];
400 }
401 int c = expandCount;
402 int delta = (availableWidth - totalWidth) / c;
403 int remainder = (availableWidth - totalWidth) % c;
404 int last = -1;
405 while (totalWidth !is availableWidth) {
406 for (int j=0; j<columnCount; j++) {
407 if (expandColumn [j]) {
408 if (widths [j] + delta > minWidths [j]) {
409 widths [last = j] = widths [j] + delta;
410 } else {
411 widths [j] = minWidths [j];
412 expandColumn [j] = false;
413 c--;
414 }
415 }
416 }
417 if (last > -1) widths [last] += remainder;
418
419 for (int j=0; j<columnCount; j++) {
420 for (int i=0; i<rowCount; i++) {
421 GridData data = getData (grid, i, j, rowCount, columnCount, false);
422 if (data !is null) {
423 int hSpan = Math.max (1, Math.min (data.horizontalSpan, columnCount));
424 if (hSpan > 1) {
425 if (!data.grabExcessHorizontalSpace || data.minimumWidth !is 0) {
426 int spanWidth = 0, spanExpandCount = 0;
427 for (int k=0; k<hSpan; k++) {
428 spanWidth += widths [j-k];
429 if (expandColumn [j-k]) spanExpandCount++;
430 }
431 int w = !data.grabExcessHorizontalSpace || data.minimumWidth is DWT.DEFAULT ? data.cacheWidth : data.minimumWidth;
432 w += data.horizontalIndent - spanWidth - (hSpan - 1) * horizontalSpacing;
433 if (w > 0) {
434 if (spanExpandCount is 0) {
435 widths [j] += w;
436 } else {
437 int delta2 = w / spanExpandCount;
438 int remainder2 = w % spanExpandCount, last2 = -1;
439 for (int k = 0; k < hSpan; k++) {
440 if (expandColumn [j-k]) {
441 widths [last2=j-k] += delta2;
442 }
443 }
444 if (last2 > -1) widths [last2] += remainder2;
445 }
446 }
447 }
448 }
449 }
450 }
451 }
452 if (c is 0) break;
453 totalWidth = 0;
454 for (int i=0; i<columnCount; i++) {
455 totalWidth += widths [i];
456 }
457 delta = (availableWidth - totalWidth) / c;
458 remainder = (availableWidth - totalWidth) % c;
459 last = -1;
460 }
461 }
462 }
463
464 /* Wrapping */
465 GridData [] flush = null;
466 int flushLength = 0;
467 if (width !is DWT.DEFAULT) {
468 for (int j=0; j<columnCount; j++) {
469 for (int i=0; i<rowCount; i++) {
470 GridData data = getData (grid, i, j, rowCount, columnCount, false);
471 if (data !is null) {
472 if (data.heightHint is DWT.DEFAULT) {
473 Control child = grid [i][j];
474 //TEMPORARY CODE
475 int hSpan = Math.max (1, Math.min (data.horizontalSpan, columnCount));
476 int currentWidth = 0;
477 for (int k=0; k<hSpan; k++) {
478 currentWidth += widths [j-k];
479 }
480 currentWidth += (hSpan - 1) * horizontalSpacing - data.horizontalIndent;
481 if ((currentWidth !is data.cacheWidth && data.horizontalAlignment is DWT.FILL) || (data.cacheWidth > currentWidth)) {
482 int trim = 0;
483 if ( auto sa = cast(Scrollable)child ) {
484 Rectangle rect = sa.computeTrim (0, 0, 0, 0);
485 trim = rect.width;
486 } else {
487 trim = child.getBorderWidth () * 2;
488 }
489 data.cacheWidth = data.cacheHeight = DWT.DEFAULT;
490 data.computeSize (child, Math.max (0, currentWidth - trim), data.heightHint, false);
491 if (data.grabExcessVerticalSpace && data.minimumHeight > 0) {
492 data.cacheHeight = Math.max (data.cacheHeight, data.minimumHeight);
493 }
494 if (flush is null) flush = new GridData [count];
495 flush [flushLength++] = data;
496 }
497 }
498 }
499 }
500 }
501 }
502
503 /* Row heights */
504 int availableHeight = height - verticalSpacing * (rowCount - 1) - (marginTop + marginHeight * 2 + marginBottom);
505 expandCount = 0;
506 int [] heights = new int [rowCount];
507 int [] minHeights = new int [rowCount];
508 bool [] expandRow = new bool [rowCount];
509 for (int i=0; i<rowCount; i++) {
510 for (int j=0; j<columnCount; j++) {
511 GridData data = getData (grid, i, j, rowCount, columnCount, true);
512 if (data !is null) {
513 int vSpan = Math.max (1, Math.min (data.verticalSpan, rowCount));
514 if (vSpan is 1) {
515 int h = data.cacheHeight + data.verticalIndent;
516 heights [i] = Math.max (heights [i], h);
517 if (data.grabExcessVerticalSpace) {
518 if (!expandRow [i]) expandCount++;
519 expandRow [i] = true;
520 }
521 if (!data.grabExcessVerticalSpace || data.minimumHeight !is 0) {
522 h = !data.grabExcessVerticalSpace || data.minimumHeight is DWT.DEFAULT ? data.cacheHeight : data.minimumHeight;
523 h += data.verticalIndent;
524 minHeights [i] = Math.max (minHeights [i], h);
525 }
526 }
527 }
528 }
529 for (int j=0; j<columnCount; j++) {
530 GridData data = getData (grid, i, j, rowCount, columnCount, false);
531 if (data !is null) {
532 int vSpan = Math.max (1, Math.min (data.verticalSpan, rowCount));
533 if (vSpan > 1) {
534 int spanHeight = 0, spanMinHeight = 0, spanExpandCount = 0;
535 for (int k=0; k<vSpan; k++) {
536 spanHeight += heights [i-k];
537 spanMinHeight += minHeights [i-k];
538 if (expandRow [i-k]) spanExpandCount++;
539 }
540 if (data.grabExcessVerticalSpace && spanExpandCount is 0) {
541 expandCount++;
542 expandRow [i] = true;
543 }
544 int h = data.cacheHeight + data.verticalIndent - spanHeight - (vSpan - 1) * verticalSpacing;
545 if (h > 0) {
546 if (spanExpandCount is 0) {
547 heights [i] += h;
548 } else {
549 int delta = h / spanExpandCount;
550 int remainder = h % spanExpandCount, last = -1;
551 for (int k = 0; k < vSpan; k++) {
552 if (expandRow [i-k]) {
553 heights [last=i-k] += delta;
554 }
555 }
556 if (last > -1) heights [last] += remainder;
557 }
558 }
559 if (!data.grabExcessVerticalSpace || data.minimumHeight !is 0) {
560 h = !data.grabExcessVerticalSpace || data.minimumHeight is DWT.DEFAULT ? data.cacheHeight : data.minimumHeight;
561 h += data.verticalIndent - spanMinHeight - (vSpan - 1) * verticalSpacing;
562 if (h > 0) {
563 if (spanExpandCount is 0) {
564 minHeights [i] += h;
565 } else {
566 int delta = h / spanExpandCount;
567 int remainder = h % spanExpandCount, last = -1;
568 for (int k = 0; k < vSpan; k++) {
569 if (expandRow [i-k]) {
570 minHeights [last=i-k] += delta;
571 }
572 }
573 if (last > -1) minHeights [last] += remainder;
574 }
575 }
576 }
577 }
578 }
579 }
580 }
581 if (height !is DWT.DEFAULT && expandCount > 0) {
582 int totalHeight = 0;
583 for (int i=0; i<rowCount; i++) {
584 totalHeight += heights [i];
585 }
586 int c = expandCount;
587 int delta = (availableHeight - totalHeight) / c;
588 int remainder = (availableHeight - totalHeight) % c;
589 int last = -1;
590 while (totalHeight !is availableHeight) {
591 for (int i=0; i<rowCount; i++) {
592 if (expandRow [i]) {
593 if (heights [i] + delta > minHeights [i]) {
594 heights [last = i] = heights [i] + delta;
595 } else {
596 heights [i] = minHeights [i];
597 expandRow [i] = false;
598 c--;
599 }
600 }
601 }
602 if (last > -1) heights [last] += remainder;
603
604 for (int i=0; i<rowCount; i++) {
605 for (int j=0; j<columnCount; j++) {
606 GridData data = getData (grid, i, j, rowCount, columnCount, false);
607 if (data !is null) {
608 int vSpan = Math.max (1, Math.min (data.verticalSpan, rowCount));
609 if (vSpan > 1) {
610 if (!data.grabExcessVerticalSpace || data.minimumHeight !is 0) {
611 int spanHeight = 0, spanExpandCount = 0;
612 for (int k=0; k<vSpan; k++) {
613 spanHeight += heights [i-k];
614 if (expandRow [i-k]) spanExpandCount++;
615 }
616 int h = !data.grabExcessVerticalSpace || data.minimumHeight is DWT.DEFAULT ? data.cacheHeight : data.minimumHeight;
617 h += data.verticalIndent - spanHeight - (vSpan - 1) * verticalSpacing;
618 if (h > 0) {
619 if (spanExpandCount is 0) {
620 heights [i] += h;
621 } else {
622 int delta2 = h / spanExpandCount;
623 int remainder2 = h % spanExpandCount, last2 = -1;
624 for (int k = 0; k < vSpan; k++) {
625 if (expandRow [i-k]) {
626 heights [last2=i-k] += delta2;
627 }
628 }
629 if (last2 > -1) heights [last2] += remainder2;
630 }
631 }
632 }
633 }
634 }
635 }
636 }
637 if (c is 0) break;
638 totalHeight = 0;
639 for (int i=0; i<rowCount; i++) {
640 totalHeight += heights [i];
641 }
642 delta = (availableHeight - totalHeight) / c;
643 remainder = (availableHeight - totalHeight) % c;
644 last = -1;
645 }
646 }
647
648 /* Position the controls */
649 if (move) {
650 int gridY = y + marginTop + marginHeight;
651 for (int i=0; i<rowCount; i++) {
652 int gridX = x + marginLeft + marginWidth;
653 for (int j=0; j<columnCount; j++) {
654 GridData data = getData (grid, i, j, rowCount, columnCount, true);
655 if (data !is null) {
656 int hSpan = Math.max (1, Math.min (data.horizontalSpan, columnCount));
657 int vSpan = Math.max (1, data.verticalSpan);
658 int cellWidth = 0, cellHeight = 0;
659 for (int k=0; k<hSpan; k++) {
660 cellWidth += widths [j+k];
661 }
662 for (int k=0; k<vSpan; k++) {
663 cellHeight += heights [i+k];
664 }
665 cellWidth += horizontalSpacing * (hSpan - 1);
666 int childX = gridX + data.horizontalIndent;
667 int childWidth = Math.min (data.cacheWidth, cellWidth);
668 switch (data.horizontalAlignment) {
669 case DWT.CENTER:
670 case GridData.CENTER:
671 childX += Math.max (0, (cellWidth - data.horizontalIndent - childWidth) / 2);
672 break;
673 case DWT.RIGHT:
674 case DWT.END:
675 case GridData.END:
676 childX += Math.max (0, cellWidth - data.horizontalIndent - childWidth);
677 break;
678 case DWT.FILL:
679 childWidth = cellWidth - data.horizontalIndent;
680 break;
681 default:
682 }
683 cellHeight += verticalSpacing * (vSpan - 1);
684 int childY = gridY + data.verticalIndent;
685 int childHeight = Math.min (data.cacheHeight, cellHeight);
686 switch (data.verticalAlignment) {
687 case DWT.CENTER:
688 case GridData.CENTER:
689 childY += Math.max (0, (cellHeight - data.verticalIndent - childHeight) / 2);
690 break;
691 case DWT.BOTTOM:
692 case DWT.END:
693 case GridData.END:
694 childY += Math.max (0, cellHeight - data.verticalIndent - childHeight);
695 break;
696 case DWT.FILL:
697 childHeight = cellHeight - data.verticalIndent;
698 break;
699 default:
700 }
701 Control child = grid [i][j];
702 if (child !is null) {
703 child.setBounds (childX, childY, childWidth, childHeight);
704 }
705 }
706 gridX += widths [j] + horizontalSpacing;
707 }
708 gridY += heights [i] + verticalSpacing;
709 }
710 }
711
712 // clean up cache
713 for (int i = 0; i < flushLength; i++) {
714 flush [i].cacheWidth = flush [i].cacheHeight = -1;
715 }
716
717 int totalDefaultWidth = 0;
718 int totalDefaultHeight = 0;
719 for (int i=0; i<columnCount; i++) {
720 totalDefaultWidth += widths [i];
721 }
722 for (int i=0; i<rowCount; i++) {
723 totalDefaultHeight += heights [i];
724 }
725 totalDefaultWidth += horizontalSpacing * (columnCount - 1) + marginLeft + marginWidth * 2 + marginRight;
726 totalDefaultHeight += verticalSpacing * (rowCount - 1) + marginTop + marginHeight * 2 + marginBottom;
727 return new Point (totalDefaultWidth, totalDefaultHeight);
728 }
729
730 char[] getName () {
731 char[] string = this.classinfo.name;
732 int index = locatePrior( string, '.');
733 if (index is string.length ) return string;
734 return string[ index + 1 .. string.length ];
735 }
736
737 /**
738 * Returns a string containing a concise, human-readable
739 * description of the receiver.
740 *
741 * @return a string representation of the layout
742 */
743 public char[] toString () {
744 char[] string = getName ()~" {";
745 if (numColumns !is 1) string ~= "numColumns="~to!(char[])(numColumns)~" ";
746 if (makeColumnsEqualWidth) string ~= "makeColumnsEqualWidth="~to!(char[])(makeColumnsEqualWidth)~" ";
747 if (marginWidth !is 0) string ~= "marginWidth="~to!(char[])(marginWidth)~" ";
748 if (marginHeight !is 0) string ~= "marginHeight="~to!(char[])(marginHeight)~" ";
749 if (marginLeft !is 0) string ~= "marginLeft="~to!(char[])(marginLeft)~" ";
750 if (marginRight !is 0) string ~= "marginRight="~to!(char[])(marginRight)~" ";
751 if (marginTop !is 0) string ~= "marginTop="~to!(char[])(marginTop)~" ";
752 if (marginBottom !is 0) string ~= "marginBottom="~to!(char[])(marginBottom)~" ";
753 if (horizontalSpacing !is 0) string ~= "horizontalSpacing="~to!(char[])(horizontalSpacing)~" ";
754 if (verticalSpacing !is 0) string ~= "verticalSpacing="~to!(char[])(verticalSpacing)~" ";
755 string = string.trim();
756 string ~= "}";
757 return string;
758 }
759 }