1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
|
/*******************************************************************************
* Copyright (c) 2000, 2009 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.widgets;
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.internal.cocoa.*;
/**
* Instances of this class provide a surface for drawing
* arbitrary graphics.
* <dl>
* <dt><b>Styles:</b></dt>
* <dd>(none)</dd>
* <dt><b>Events:</b></dt>
* <dd>(none)</dd>
* </dl>
* <p>
* This class may be subclassed by custom control implementors
* who are building controls that are <em>not</em> constructed
* from aggregates of other controls. That is, they are either
* painted using SWT graphics calls or are handled by native
* methods.
* </p>
*
* @see Composite
* @see <a href="http://www.eclipse.org/swt/snippets/#canvas">Canvas snippets</a>
* @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: ControlExample</a>
* @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
*/
public class Canvas extends Composite {
Caret caret;
IME ime;
NSOpenGLContext context;
Canvas () {
/* Do nothing */
}
int /*long*/ attributedSubstringFromRange (int /*long*/ id, int /*long*/ sel, int /*long*/ range) {
if (ime != null) return ime.attributedSubstringFromRange (id, sel, range);
return super.attributedSubstringFromRange(id, sel, range);
}
void sendFocusEvent(int type) {
if (caret != null) {
if (type == SWT.FocusIn) {
caret.setFocus();
} else {
caret.killFocus();
}
}
super.sendFocusEvent(type);
}
/**
* Constructs a new instance of this class given its parent
* and a style value describing its behavior and appearance.
* <p>
* The style value is either one of the style constants defined in
* class <code>SWT</code> which is applicable to instances of this
* class, or must be built by <em>bitwise OR</em>'ing together
* (that is, using the <code>int</code> "|" operator) two or more
* of those <code>SWT</code> style constants. The class description
* lists the style constants that are applicable to the class.
* Style bits are also inherited from superclasses.
* </p>
*
* @param parent a composite control which will be the parent of the new instance (cannot be null)
* @param style the style of control to construct
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
* </ul>
*
* @see SWT
* @see Widget#checkSubclass
* @see Widget#getStyle
*/
public Canvas (Composite parent, int style) {
super (parent, style);
}
int /*long*/ characterIndexForPoint (int /*long*/ id, int /*long*/ sel, int /*long*/ point) {
if (ime != null) return ime.characterIndexForPoint (id, sel, point);
return super.characterIndexForPoint (id, sel, point);
}
/**
* Fills the interior of the rectangle specified by the arguments,
* with the receiver's background.
*
* @param gc the gc where the rectangle is to be filled
* @param x the x coordinate of the rectangle to be filled
* @param y the y coordinate of the rectangle to be filled
* @param width the width of the rectangle to be filled
* @param height the height of the rectangle to be filled
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the gc is null</li>
* <li>ERROR_INVALID_ARGUMENT - if the gc has been disposed</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
* </ul>
*
* @since 3.2
*/
public void drawBackground (GC gc, int x, int y, int width, int height) {
drawBackground(gc, x, y, width, height, 0, 0);
}
void drawRect (int /*long*/ id, int /*long*/ sel, NSRect rect) {
if (context != null && context.view() == null) context.setView(view);
super.drawRect(id, sel, rect);
}
void drawWidget (int /*long*/ id, NSGraphicsContext context, NSRect rect) {
if (id != view.id) return;
super.drawWidget (id, context, rect);
if (caret == null) return;
if (caret.isShowing) {
int /*long*/ ctx = context.graphicsPort();
OS.CGContextSaveGState (ctx);
OS.CGContextSetBlendMode (ctx, OS.kCGBlendModeDifference);
Image image = caret.image;
if (image != null) {
NSImage imageHandle = image.handle;
NSImageRep imageRep = imageHandle.bestRepresentationForDevice(null);
if (!imageRep.isKindOfClass(OS.class_NSBitmapImageRep)) return;
NSBitmapImageRep rep = new NSBitmapImageRep(imageRep);
CGRect destRect = new CGRect ();
destRect.origin.x = caret.x;
destRect.origin.y = caret.y;
NSSize size = imageHandle.size();
destRect.size.width = size.width;
destRect.size.height = size.height;
int /*long*/ data = rep.bitmapData();
int /*long*/ format = rep.bitmapFormat();
int /*long*/ bpr = rep.bytesPerRow();
int alphaInfo;
if (rep.hasAlpha()) {
alphaInfo = (format & OS.NSAlphaFirstBitmapFormat) != 0 ? OS.kCGImageAlphaFirst : OS.kCGImageAlphaLast;
} else {
alphaInfo = (format & OS.NSAlphaFirstBitmapFormat) != 0 ? OS.kCGImageAlphaNoneSkipFirst : OS.kCGImageAlphaNoneSkipLast;
}
int /*long*/ provider = OS.CGDataProviderCreateWithData(0, data, bpr * (int)size.height, 0);
int /*long*/ colorspace = OS.CGColorSpaceCreateDeviceRGB();
int /*long*/ cgImage = OS.CGImageCreate((int)size.width, (int)size.height, rep.bitsPerSample(), rep.bitsPerPixel(), bpr, colorspace, alphaInfo, provider, 0, true, 0);
OS.CGColorSpaceRelease(colorspace);
OS.CGDataProviderRelease(provider);
OS.CGContextScaleCTM (ctx, 1, -1);
OS.CGContextTranslateCTM (ctx, 0, -(size.height + 2 * destRect.origin.y));
OS.CGContextSetBlendMode (ctx, OS.kCGBlendModeDifference);
OS.CGContextDrawImage (ctx, destRect, cgImage);
OS.CGImageRelease(cgImage);
} else {
CGRect drawRect = new CGRect();
drawRect.origin.x = caret.x;
drawRect.origin.y = caret.y;
drawRect.size.width = caret.width != 0 ? caret.width : Caret.DEFAULT_WIDTH;
drawRect.size.height = caret.height;
int /*long*/ colorspace = OS.CGColorSpaceCreateDeviceRGB();
OS.CGContextSetFillColorSpace(ctx, colorspace);
OS.CGColorSpaceRelease(colorspace);
OS.CGContextSetFillColor(ctx, new float /*double*/ [] {1, 1, 1, 1});
OS.CGContextFillRect(ctx, drawRect);
}
OS.CGContextRestoreGState(ctx);
}
}
NSRect firstRectForCharacterRange (int /*long*/ id, int /*long*/ sel, int /*long*/ range) {
if (ime != null) return ime.firstRectForCharacterRange (id, sel, range);
return super.firstRectForCharacterRange (id, sel, range);
}
/**
* Returns the caret.
* <p>
* The caret for the control is automatically hidden
* and shown when the control is painted or resized,
* when focus is gained or lost and when an the control
* is scrolled. To avoid drawing on top of the caret,
* the programmer must hide and show the caret when
* drawing in the window any other time.
* </p>
*
* @return the caret for the receiver, may be null
*
* @exception SWTException <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
* </ul>
*/
public Caret getCaret () {
checkWidget();
return caret;
}
/**
* Returns the IME.
*
* @return the IME
*
* @exception SWTException <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
* </ul>
*
* @since 3.4
*/
public IME getIME () {
checkWidget();
return ime;
}
boolean hasMarkedText (int /*long*/ id, int /*long*/ sel) {
if (ime != null) return ime.hasMarkedText (id, sel);
return super.hasMarkedText (id, sel);
}
boolean imeInComposition () {
return ime != null && ime.isInlineEnabled () && ime.startOffset != -1;
}
boolean insertText (int /*long*/ id, int /*long*/ sel, int /*long*/ string) {
if (ime != null) {
if (!ime.insertText (id, sel, string)) return false;
}
return super.insertText (id, sel, string);
}
boolean isOpaque (int /*long*/ id, int /*long*/ sel) {
if (context != null) return true;
return super.isOpaque(id, sel);
}
NSRange markedRange (int /*long*/ id, int /*long*/ sel) {
if (ime != null) return ime.markedRange (id, sel);
return super.markedRange (id, sel);
}
void releaseChildren (boolean destroy) {
if (caret != null) {
caret.release (false);
caret = null;
}
if (ime != null) {
ime.release (false);
ime = null;
}
super.releaseChildren (destroy);
}
void reskinChildren (int flags) {
if (caret != null) caret.reskin (flags);
if (ime != null) ime.reskin (flags);
super.reskinChildren (flags);
}
/**
* Scrolls a rectangular area of the receiver by first copying
* the source area to the destination and then causing the area
* of the source which is not covered by the destination to
* be repainted. Children that intersect the rectangle are
* optionally moved during the operation. In addition, all outstanding
* paint events are flushed before the source area is copied to
* ensure that the contents of the canvas are drawn correctly.
*
* @param destX the x coordinate of the destination
* @param destY the y coordinate of the destination
* @param x the x coordinate of the source
* @param y the y coordinate of the source
* @param width the width of the area
* @param height the height of the area
* @param all <code>true</code>if children should be scrolled, and <code>false</code> otherwise
*
* @exception SWTException <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
* </ul>
*/
public void scroll (int destX, int destY, int x, int y, int width, int height, boolean all) {
checkWidget();
if (width <= 0 || height <= 0) return;
int deltaX = destX - x, deltaY = destY - y;
if (deltaX == 0 && deltaY == 0) return;
if (!isDrawing ()) return;
NSRect visibleRect = view.visibleRect();
if (visibleRect.width <= 0 || visibleRect.height <= 0) return;
boolean isFocus = caret != null && caret.isFocusCaret ();
if (isFocus) caret.killFocus ();
Rectangle clientRect = getClientArea ();
Rectangle sourceRect = new Rectangle (x, y, width, height);
if (sourceRect.intersects (clientRect)) {
update (all);
}
Control control = findBackgroundControl ();
boolean redraw = control != null && control.backgroundImage != null;
if (!redraw) redraw = hasRegion ();
if (!redraw) redraw = isObscured ();
if (redraw) {
redrawWidget (view, x, y, width, height, false);
redrawWidget (view, destX, destY, width, height, false);
} else {
NSRect damage = new NSRect();
damage.x = x;
damage.y = y;
damage.width = width;
damage.height = height;
NSPoint dest = new NSPoint();
dest.x = destX;
dest.y = destY;
view.lockFocus();
OS.NSCopyBits(0, damage , dest);
view.unlockFocus();
boolean disjoint = (destX + width < x) || (x + width < destX) || (destY + height < y) || (y + height < destY);
if (disjoint) {
view.setNeedsDisplayInRect(damage);
} else {
if (deltaX != 0) {
int newX = destX - deltaX;
if (deltaX < 0) newX = destX + width;
damage.x = newX;
damage.width = Math.abs(deltaX);
view.setNeedsDisplayInRect(damage);
}
if (deltaY != 0) {
int newY = destY - deltaY;
if (deltaY < 0) newY = destY + height;
damage.x = x;
damage.y = newY;
damage.width = width;
damage.height = Math.abs (deltaY);
view.setNeedsDisplayInRect(damage);
}
}
NSRect srcRect = new NSRect();
srcRect.x = sourceRect.x;
srcRect.y = sourceRect.y;
srcRect.width = sourceRect.width;
srcRect.height = sourceRect.height;
OS.NSIntersectionRect(visibleRect, visibleRect, srcRect);
if (!OS.NSEqualRects(visibleRect, srcRect)) {
if (srcRect.x != visibleRect.x) {
damage.x = srcRect.x + deltaX;
damage.y = srcRect.y + deltaY;
damage.width = visibleRect.x - srcRect.x;
damage.height = srcRect.height;
view.setNeedsDisplayInRect(damage);
}
if (visibleRect.x + visibleRect.width != srcRect.x + srcRect.width) {
damage.x = srcRect.x + visibleRect.width + deltaX;
damage.y = srcRect.y + deltaY;
damage.width = srcRect.width - visibleRect.width;
damage.height = srcRect.height;
view.setNeedsDisplayInRect(damage);
}
if (visibleRect.y != srcRect.y) {
damage.x = visibleRect.x + deltaX;
damage.y = srcRect.y + deltaY;
damage.width = visibleRect.width;
damage.height = visibleRect.y - srcRect.y;
view.setNeedsDisplayInRect(damage);
}
if (visibleRect.y + visibleRect.height != srcRect.y + srcRect.height) {
damage.x = visibleRect.x + deltaX;
damage.y = visibleRect.y + visibleRect.height + deltaY;
damage.width = visibleRect.width;
damage.height = srcRect.y + srcRect.height - (visibleRect.y + visibleRect.height);
view.setNeedsDisplayInRect(damage);
}
}
}
if (all) {
Control [] children = _getChildren ();
for (int i=0; i<children.length; i++) {
Control child = children [i];
Rectangle rect = child.getBounds ();
if (Math.min(x + width, rect.x + rect.width) >= Math.max (x, rect.x) &&
Math.min(y + height, rect.y + rect.height) >= Math.max (y, rect.y)) {
child.setLocation (rect.x + deltaX, rect.y + deltaY);
}
}
}
if (isFocus) caret.setFocus ();
}
NSRange selectedRange (int /*long*/ id, int /*long*/ sel) {
if (ime != null) return ime.selectedRange (id, sel);
return super.selectedRange (id, sel);
}
boolean sendKeyEvent (NSEvent nsEvent, int type) {
if (caret != null) NSCursor.setHiddenUntilMouseMoves (true);
return super.sendKeyEvent (nsEvent, type);
}
/**
* Sets the receiver's caret.
* <p>
* The caret for the control is automatically hidden
* and shown when the control is painted or resized,
* when focus is gained or lost and when an the control
* is scrolled. To avoid drawing on top of the caret,
* the programmer must hide and show the caret when
* drawing in the window any other time.
* </p>
* @param caret the new caret for the receiver, may be null
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_INVALID_ARGUMENT - if the caret has been disposed</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
* </ul>
*/
public void setCaret (Caret caret) {
checkWidget();
Caret newCaret = caret;
Caret oldCaret = this.caret;
this.caret = newCaret;
if (hasFocus ()) {
if (oldCaret != null) oldCaret.killFocus ();
if (newCaret != null) {
if (newCaret.isDisposed()) error(SWT.ERROR_INVALID_ARGUMENT);
newCaret.setFocus ();
}
}
}
public void setFont (Font font) {
checkWidget ();
if (caret != null) caret.setFont (font);
super.setFont (font);
}
void setOpenGLContext(Object value) {
context = (NSOpenGLContext)value;
}
/**
* Sets the receiver's IME.
*
* @param ime the new IME for the receiver, may be null
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_INVALID_ARGUMENT - if the IME has been disposed</li>
* </ul>
* @exception SWTException <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
* </ul>
*
* @since 3.4
*/
public void setIME (IME ime) {
checkWidget ();
if (ime != null && ime.isDisposed()) error(SWT.ERROR_INVALID_ARGUMENT);
this.ime = ime;
}
boolean setMarkedText_selectedRange (int /*long*/ id, int /*long*/ sel, int /*long*/ string, int /*long*/ range) {
if (ime != null) {
if (!ime.setMarkedText_selectedRange (id, sel, string, range)) return false;
}
return super.setMarkedText_selectedRange (id, sel, string, range);
}
int /*long*/ validAttributesForMarkedText (int /*long*/ id, int /*long*/ sel) {
if (ime != null) return ime.validAttributesForMarkedText (id, sel);
return super.validAttributesForMarkedText(id, sel);
}
void updateOpenGLContext(int /*long*/ id, int /*long*/ sel, int /*long*/ notification) {
if (context != null) ((NSOpenGLContext)context).update();
}
}
|