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comparison dwtx/draw2d/BorderLayout.d @ 98:95307ad235d9

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Added Draw2d code, still work in progress
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 00:52:14 +0200
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96:b492ba44e44d 98:95307ad235d9
1 /*******************************************************************************
2 * Copyright (c) 2000, 2005 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 dwtx.draw2d.BorderLayout;
14
15 import dwt.dwthelper.utils;
16
17 import dwtx.draw2d.geometry.Dimension;
18 import dwtx.draw2d.geometry.Insets;
19 import dwtx.draw2d.geometry.Rectangle;
20 import dwtx.draw2d.AbstractHintLayout;
21 import dwtx.draw2d.IFigure;
22 import dwtx.draw2d.PositionConstants;
23
24 /**
25 * @author Pratik Shah
26 */
27 public class BorderLayout
28 : AbstractHintLayout
29 {
30
31 /**
32 * Constant to be used as a constraint for child figures
33 */
34 public static const Integer CENTER;
35 /**
36 * Constant to be used as a constraint for child figures
37 */
38 public static const Integer TOP;
39 /**
40 * Constant to be used as a constraint for child figures
41 */
42 public static const Integer BOTTOM;
43 /**
44 * Constant to be used as a constraint for child figures
45 */
46 public static const Integer LEFT;
47 /**
48 * Constant to be used as a constraint for child figures
49 */
50 public static const Integer RIGHT;
51
52 static this(){
53 CENTER = new Integer(PositionConstants.CENTER);
54 TOP = new Integer(PositionConstants.TOP);
55 BOTTOM = new Integer(PositionConstants.BOTTOM);
56 LEFT = new Integer(PositionConstants.LEFT);
57 RIGHT = new Integer(PositionConstants.RIGHT);
58 }
59
60 private IFigure center, left, top, bottom, right;
61 private int vGap = 0, hGap = 0;
62
63 /**
64 * @see dwtx.draw2d.AbstractHintLayout#calculateMinimumSize(IFigure, int, int)
65 */
66 protected Dimension calculateMinimumSize(IFigure container, int wHint, int hHint) {
67 int minWHint = 0, minHHint = 0;
68 if (wHint < 0) {
69 minWHint = -1;
70 }
71 if (hHint < 0) {
72 minHHint = -1;
73 }
74 Insets border = container.getInsets();
75 wHint = Math.max(minWHint, wHint - border.getWidth());
76 hHint = Math.max(minHHint, hHint - border.getHeight());
77 Dimension minSize = new Dimension();
78 int middleRowWidth = 0, middleRowHeight = 0;
79 int rows = 0, columns = 0;
80
81 if (top !is null && top.isVisible()) {
82 Dimension childSize = top.getMinimumSize(wHint, hHint);
83 hHint = Math.max(minHHint, hHint - (childSize.height + vGap));
84 minSize.setSize(childSize);
85 rows += 1;
86 }
87 if (bottom !is null && bottom.isVisible()) {
88 Dimension childSize = bottom.getMinimumSize(wHint, hHint);
89 hHint = Math.max(minHHint, hHint - (childSize.height + vGap));
90 minSize.width = Math.max(minSize.width, childSize.width);
91 minSize.height += childSize.height;
92 rows += 1;
93 }
94 if (left !is null && left.isVisible()) {
95 Dimension childSize = left.getMinimumSize(wHint, hHint);
96 middleRowWidth = childSize.width;
97 middleRowHeight = childSize.height;
98 wHint = Math.max(minWHint, wHint - (childSize.width + hGap));
99 columns += 1;
100 }
101 if (right !is null && right.isVisible()) {
102 Dimension childSize = right.getMinimumSize(wHint, hHint);
103 middleRowWidth += childSize.width;
104 middleRowHeight = Math.max(childSize.height, middleRowHeight);
105 wHint = Math.max(minWHint, wHint - (childSize.width + hGap));
106 columns += 1;
107 }
108 if (center !is null && center.isVisible()) {
109 Dimension childSize = center.getMinimumSize(wHint, hHint);
110 middleRowWidth += childSize.width;
111 middleRowHeight = Math.max(childSize.height, middleRowHeight);
112 columns += 1;
113 }
114
115 rows += columns > 0 ? 1 : 0;
116 // Add spacing, insets, and the size of the middle row
117 minSize.height += middleRowHeight + border.getHeight() + ((rows - 1) * vGap);
118 minSize.width = Math.max(minSize.width, middleRowWidth) + border.getWidth()
119 + ((columns - 1) * hGap);
120
121 return minSize;
122 }
123
124 /**
125 * @see AbstractLayout#calculatePreferredSize(IFigure, int, int)
126 */
127 protected Dimension calculatePreferredSize(IFigure container, int wHint, int hHint) {
128 int minWHint = 0, minHHint = 0;
129 if (wHint < 0)
130 minWHint = -1;
131
132 if (hHint < 0)
133 minHHint = -1;
134
135 Insets border = container.getInsets();
136 wHint = Math.max(minWHint, wHint - border.getWidth());
137 hHint = Math.max(minHHint, hHint - border.getHeight());
138 Dimension prefSize = new Dimension();
139 int middleRowWidth = 0, middleRowHeight = 0;
140 int rows = 0, columns = 0;
141
142 if (top !is null && top.isVisible()) {
143 Dimension childSize = top.getPreferredSize(wHint, hHint);
144 hHint = Math.max(minHHint, hHint - (childSize.height + vGap));
145 prefSize.setSize(childSize);
146 rows += 1;
147 }
148 if (bottom !is null && bottom.isVisible()) {
149 Dimension childSize = bottom.getPreferredSize(wHint, hHint);
150 hHint = Math.max(minHHint, hHint - (childSize.height + vGap));
151 prefSize.width = Math.max(prefSize.width, childSize.width);
152 prefSize.height += childSize.height;
153 rows += 1;
154 }
155 if (left !is null && left.isVisible()) {
156 Dimension childSize = left.getPreferredSize(wHint, hHint);
157 middleRowWidth = childSize.width;
158 middleRowHeight = childSize.height;
159 wHint = Math.max(minWHint, wHint - (childSize.width + hGap));
160 columns += 1;
161 }
162 if (right !is null && right.isVisible()) {
163 Dimension childSize = right.getPreferredSize(wHint, hHint);
164 middleRowWidth += childSize.width;
165 middleRowHeight = Math.max(childSize.height, middleRowHeight);
166 wHint = Math.max(minWHint, wHint - (childSize.width + hGap));
167 columns += 1;
168 }
169 if (center !is null && center.isVisible()) {
170 Dimension childSize = center.getPreferredSize(wHint, hHint);
171 middleRowWidth += childSize.width;
172 middleRowHeight = Math.max(childSize.height, middleRowHeight);
173 columns += 1;
174 }
175
176 rows += columns > 0 ? 1 : 0;
177 // Add spacing, insets, and the size of the middle row
178 prefSize.height += middleRowHeight + border.getHeight() + ((rows - 1) * vGap);
179 prefSize.width = Math.max(prefSize.width, middleRowWidth) + border.getWidth()
180 + ((columns - 1) * hGap);
181
182 return prefSize;
183 }
184
185 /**
186 * @see dwtx.draw2d.LayoutManager#layout(IFigure)
187 */
188 public void layout(IFigure container) {
189 Rectangle area = container.getClientArea();
190 Rectangle rect = new Rectangle();
191
192 Dimension childSize;
193
194 if (top !is null && top.isVisible()) {
195 childSize = top.getPreferredSize(area.width, -1);
196 rect.setLocation(area.x, area.y);
197 rect.setSize(childSize);
198 rect.width = area.width;
199 top.setBounds(rect);
200 area.y += rect.height + vGap;
201 area.height -= rect.height + vGap;
202 }
203 if (bottom !is null && bottom.isVisible()) {
204 childSize = bottom.getPreferredSize(Math.max(area.width, 0), -1);
205 rect.setSize(childSize);
206 rect.width = area.width;
207 rect.setLocation(area.x, area.y + area.height - rect.height);
208 bottom.setBounds(rect);
209 area.height -= rect.height + vGap;
210 }
211 if (left !is null && left.isVisible()) {
212 childSize = left.getPreferredSize(-1, Math.max(0, area.height));
213 rect.setLocation(area.x, area.y);
214 rect.width = childSize.width;
215 rect.height = Math.max(0, area.height);
216 left.setBounds(rect);
217 area.x += rect.width + hGap;
218 area.width -= rect.width + hGap;
219 }
220 if (right !is null && right.isVisible()) {
221 childSize = right.getPreferredSize(-1, Math.max(0, area.height));
222 rect.width = childSize.width;
223 rect.height = Math.max(0, area.height);
224 rect.setLocation(area.x + area.width - rect.width, area.y);
225 right.setBounds(rect);
226 area.width -= rect.width + hGap;
227 }
228 if (center !is null && center.isVisible()) {
229 if (area.width < 0)
230 area.width = 0;
231 if (area.height < 0)
232 area.height = 0;
233 center.setBounds(area);
234 }
235 }
236
237 /**
238 * @see dwtx.draw2d.AbstractLayout#remove(IFigure)
239 */
240 public void remove(IFigure child) {
241 if (center is child) {
242 center = null;
243 } else if (top is child) {
244 top = null;
245 } else if (bottom is child) {
246 bottom = null;
247 } else if (right is child) {
248 right = null;
249 } else if (left is child) {
250 left = null;
251 }
252 }
253
254 /**
255 * Sets the location of hte given child in this layout. Valid constraints:
256 * <UL>
257 * <LI>{@link #CENTER}</LI>
258 * <LI>{@link #TOP}</LI>
259 * <LI>{@link #BOTTOM}</LI>
260 * <LI>{@link #LEFT}</LI>
261 * <LI>{@link #RIGHT}</LI>
262 * <LI><code>null</code> (to remove a child's constraint)</LI>
263 * </UL>
264 *
265 * <p>
266 * Ensure that the given Figure is indeed a child of the Figure on which this layout has
267 * been set. Proper behaviour cannot be guaranteed if that is not the case. Also ensure
268 * that every child has a valid constraint.
269 * </p>
270 * <p>
271 * Passing a <code>null</code> constraint will invoke {@link #remove(IFigure)}.
272 * </p>
273 * <p>
274 * If the given child was assigned another constraint earlier, it will be re-assigned to
275 * the new constraint. If there is another child with the given constraint, it will be
276 * over-ridden so that the given child now has that constraint.
277 * </p>
278 *
279 * @see dwtx.draw2d.AbstractLayout#setConstraint(IFigure, Object)
280 */
281 public void setConstraint(IFigure child, Object constraint) {
282 remove(child);
283 super.setConstraint(child, constraint);
284 if (constraint is null) {
285 return;
286 }
287
288 switch ((cast(Integer) constraint).intValue()) {
289 case PositionConstants.CENTER :
290 center = child;
291 break;
292 case PositionConstants.TOP :
293 top = child;
294 break;
295 case PositionConstants.BOTTOM :
296 bottom = child;
297 break;
298 case PositionConstants.RIGHT :
299 right = child;
300 break;
301 case PositionConstants.LEFT :
302 left = child;
303 break;
304 default :
305 break;
306 }
307 }
308
309 /**
310 * Sets the horizontal spacing to be used between the children. Default is 0.
311 *
312 * @param gap The horizonal spacing
313 */
314 public void setHorizontalSpacing(int gap) {
315 hGap = gap;
316 }
317
318 /**
319 * Sets the vertical spacing ot be used between the children. Default is 0.
320 *
321 * @param gap The vertical spacing
322 */
323 public void setVerticalSpacing(int gap) {
324 vGap = gap;
325 }
326
327 }