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1
15
16
17 package swingwt.awt.swtcustomlayout;
18
19
20
21 import org.eclipse.swt.widgets.*;
22 import org.eclipse.swt.graphics.Point;
23 import org.eclipse.swt.graphics.Rectangle;
24
25 public class SWTBorderLayout extends Layout
26 {
27 private boolean _cached;
28 private int _hgap;
29 private int _vgap;
30 private int _north;
31 private int _west;
32 private int _east;
33 private int _south;
34 private int _center;
35 private int _firstLine;
36 private int _lastLine;
37 private int _firstItem;
38 private int _lastItem;
39 protected static final int INT_NONE = -1;
40 protected static final int INT_NORTH = 0;
41 public static final Integer  NORTH = new Integer (0);
42 protected static final int INT_SOUTH = 1;
43 public static final Integer SOUTH = new Integer (1);
44 protected static final int INT_EAST = 2;
45 public static final Integer EAST = new Integer (2);
46 protected static final int INT_WEST = 3;
47 public static final Integer WEST = new Integer (3);
48 protected static final int INT_CENTER = 4;
49 public static final Integer CENTER = new Integer (4);
50 protected static final int INT_BEFORE_FIRST_LINE = 5;
51 public static final Integer BEFORE_FIRST_LINE = new Integer (5);
52 protected static final int INT_AFTER_LAST_LINE = 6;
53 public static final Integer AFTER_LAST_LINE = new Integer (6);
54 protected static final int INT_BEFORE_LINE_BEGINS = 7;
55 public static final Integer BEFORE_LINE_BEGINS = new Integer (7);
56 protected static final int INT_AFTER_LINE_ENDS = 8;
57 public static final Integer AFTER_LINE_ENDS = new Integer (8);
58
59 static
60 {
61 }
62
63 public SWTBorderLayout()
64 {
65 this(0, 0);
66 }
67
68 public SWTBorderLayout(int hgap, int vgap)
69 {
70 setHgap(hgap);
71 setVgap(vgap);
72 }
73
74 public int getHgap()
75 {
76 return _hgap;
77 }
78
79 public void setHgap(int hgap)
80 {
81 _hgap = hgap;
82 }
83
84 public int getVgap()
85 {
86 return _vgap;
87 }
88
89 public void setVgap(int vgap)
90 {
91 _vgap = vgap;
92 }
93
94 protected void determineControlPositions(Control controls[])
95 {
96 setCenter(-1);
97 setNorth(-1);
98 setSouth(-1);
99 setEast(-1);
100 setWest(-1);
101 setFirstLine(-1);
102 setLastLine(-1);
103 setFirstItem(-1);
104 setLastItem(-1);
105 for (int i = 0; i < controls.length; i++)
106 {
107 int position;
108 Control control = controls[i];
109 Object layoutData = control.getLayoutData();
110 if (layoutData != null && !(layoutData instanceof Integer ))
111 throw new IllegalArgumentException ("Bad control layout data");
112 Integer positionAsInteger = (Integer )layoutData;
113 if (positionAsInteger == null)
114 position = 4;
115 else
116 position = positionAsInteger.intValue();
117 switch (position)
118 {
119 case 4:
120 setCenter(i);
121 break;
122
123 case 0:
124 setNorth(i);
125 break;
126
127 case 1:
128 setSouth(i);
129 break;
130
131 case 2:
132 setEast(i);
133 break;
134
135 case 3:
136 setWest(i);
137 break;
138
139 case 5:
140 setFirstLine(i);
141 break;
142
143 case 6:
144 setLastLine(i);
145 break;
146
147 case 7:
148 setFirstItem(i);
149 break;
150
151 case 8:
152 setLastItem(i);
153 break;
154
155 default:
156 throw new IllegalArgumentException (new StringBuffer ("cannot add to layout: unknown constraint: ").append(position).toString());
157 }
158 setCached(true);
159 }
160 }
161
162 protected Point computeSize(Composite composite, int wHint, int hHint, boolean flushCache)
163 {
164 Control children[] = composite.getChildren();
165 if (!isCached() || flushCache)
166 determineControlPositions(children);
167 Point size = new Point(0, 0);
168 boolean ltr = true;
169 Control c = null;
170 if ((c = getChild(children, 2, ltr)) != null)
171 {
172 Point d = c.computeSize(-1, -1);
173 size.x += d.x + getHgap();
174 size.y = Math.max(d.y, size.y);
175 }
176 if ((c = getChild(children, 3, ltr)) != null)
177 {
178 Point d = c.computeSize(-1, -1);
179 size.x += d.x + getHgap();
180 size.y = Math.max(d.y, size.y);
181 }
182 if ((c = getChild(children, 4, ltr)) != null)
183 {
184 Point d = c.computeSize(-1, -1);
185 size.x += d.x;
186 size.y = Math.max(d.y, size.y);
187 }
188 if ((c = getChild(children, 0, ltr)) != null)
189 {
190 Point d = c.computeSize(-1, -1);
191 size.x = Math.max(d.x, size.x);
192 size.y += d.y + getVgap();
193 }
194 if ((c = getChild(children, 1, ltr)) != null)
195 {
196 Point d = c.computeSize(-1, -1);
197 size.x = Math.max(d.x, size.x);
198 size.y += d.y + getVgap();
199 }
200 return size;
201 }
202
203 protected void layout(Composite composite, boolean flushCache)
204 {
205 Control children[] = composite.getChildren();
206 if (!isCached() || flushCache)
207 determineControlPositions(children);
208 Rectangle r = composite.getClientArea();
209 int count = children.length;
210 if (count == 0)
211 return;
212 boolean ltr = true;
213 Control c = null;
214 if ((c = getChild(children, 0, ltr)) != null)
215 {
216 Point d = c.computeSize(-1, -1);
217 c.setBounds(r.x, r.y, r.width, d.y);
218 int delta = d.y + getVgap();
219 r.y += delta;
220 }
221 if ((c = getChild(children, 1, ltr)) != null)
222 {
223 Point d = c.computeSize(-1, -1);
224 c.setBounds(r.x, r.height - d.y, r.width, d.y);
225 r.height -= d.y + getVgap();
226 }
227 if ((c = getChild(children, 2, ltr)) != null)
228 {
229 Point d = c.computeSize(-1, -1);
230 c.setBounds(r.width - d.x, r.y, d.x, r.height - r.y);
231 r.width -= d.x + getHgap();
232 }
233 if ((c = getChild(children, 3, ltr)) != null)
234 {
235 Point d = c.computeSize(-1, -1);
236 c.setBounds(r.x, r.y, d.x, r.height - r.y);
237 int delta = d.x + getHgap();
238 r.x += delta;
239 }
240 if ((c = getChild(children, 4, ltr)) != null)
241 c.setBounds(r.x, r.y, r.width - r.x, r.height - r.y);
242 }
243
244 protected Control getChild(Control children[], int key, boolean ltr)
245 {
246 int result = -1;
247 switch (key)
248 {
249 case 0:
250 result = (getFirstLine() != -1) ? getFirstLine() : getNorth();
251 break;
252
253 case 1:
254 result = (getLastLine() != -1) ? getLastLine() : getSouth();
255 break;
256
257 case 3:
258 result = ltr ? getFirstItem() : getLastItem();
259 if (result == -1)
260 result = getWest();
261 break;
262
263 case 2:
264 result = ltr ? getLastItem() : getFirstItem();
265 if (result == -1)
266 result = getEast();
267 break;
268
269 case 4:
270 result = getCenter();
271 break;
272 }
273 if (result != -1 && !children[result].isVisible())
274 result = -1;
275 if (result == -1)
276 return null;
277 else
278 return children[result];
279 }
280
281 public String toString()
282 {
283 return "[" + paramString() + "]";
284 }
285
286 protected String paramString()
287 {
288 return getHgap() + ",vgap=" + getVgap();
289 }
290
291 protected int getWest()
292 {
293 return _west;
294 }
295
296 protected void setWest(int west)
297 {
298 _west = west;
299 }
300
301 protected int getSouth()
302 {
303 return _south;
304 }
305
306 protected void setSouth(int south)
307 {
308 _south = south;
309 }
310
311 protected int getNorth()
312 {
313 return _north;
314 }
315
316 protected void setNorth(int north)
317 {
318 _north = north;
319 }
320
321 protected int getLastLine()
322 {
323 return _lastLine;
324 }
325
326 protected void setLastLine(int lastLine)
327 {
328 _lastLine = lastLine;
329 }
330
331 protected int getLastItem()
332 {
333 return _lastItem;
334 }
335
336 protected void setLastItem(int lastItem)
337 {
338 _lastItem = lastItem;
339 }
340
341 protected int getFirstLine()
342 {
343 return _firstLine;
344 }
345
346 protected void setFirstLine(int firstLine)
347 {
348 _firstLine = firstLine;
349 }
350
351 protected int getFirstItem()
352 {
353 return _firstItem;
354 }
355
356 protected void setFirstItem(int firstItem)
357 {
358 _firstItem = firstItem;
359 }
360
361 protected int getEast()
362 {
363 return _east;
364 }
365
366 protected void setEast(int east)
367 {
368 _east = east;
369 }
370
371 protected int getCenter()
372 {
373 return _center;
374 }
375
376 protected void setCenter(int center)
377 {
378 _center = center;
379 }
380
381 protected boolean isCached()
382 {
383 return _cached;
384 }
385
386 protected void setCached(boolean cached)
387 {
388 _cached = cached;
389 }
390 }
391 |
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