forked from Floorp-Projects/Floorp
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathnsMathMLContainerFrame.cpp
1619 lines (1421 loc) · 60.7 KB
/
nsMathMLContainerFrame.cpp
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
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsMathMLContainerFrame.h"
#include "gfxUtils.h"
#include "mozilla/gfx/2D.h"
#include "nsLayoutUtils.h"
#include "nsPresContext.h"
#include "nsIPresShell.h"
#include "nsStyleContext.h"
#include "nsNameSpaceManager.h"
#include "nsRenderingContext.h"
#include "nsIDOMMutationEvent.h"
#include "nsGkAtoms.h"
#include "nsAutoPtr.h"
#include "nsDisplayList.h"
#include "nsIReflowCallback.h"
#include "mozilla/Likely.h"
#include "nsIScriptError.h"
#include "nsContentUtils.h"
#include "nsMathMLElement.h"
using namespace mozilla;
using namespace mozilla::gfx;
//
// nsMathMLContainerFrame implementation
//
NS_QUERYFRAME_HEAD(nsMathMLContainerFrame)
NS_QUERYFRAME_ENTRY(nsIMathMLFrame)
NS_QUERYFRAME_ENTRY(nsMathMLContainerFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
// =============================================================================
// error handlers
// provide a feedback to the user when a frame with bad markup can not be rendered
nsresult
nsMathMLContainerFrame::ReflowError(DrawTarget* aDrawTarget,
nsHTMLReflowMetrics& aDesiredSize)
{
// clear all other flags and record that there is an error with this frame
mEmbellishData.flags = 0;
mPresentationData.flags = NS_MATHML_ERROR;
///////////////
// Set font
RefPtr<nsFontMetrics> fm;
nsLayoutUtils::GetFontMetricsForFrame(this, getter_AddRefs(fm),
nsLayoutUtils::
FontSizeInflationFor(this));
// bounding metrics
nsAutoString errorMsg; errorMsg.AssignLiteral("invalid-markup");
mBoundingMetrics =
nsLayoutUtils::AppUnitBoundsOfString(errorMsg.get(), errorMsg.Length(),
*fm, aDrawTarget);
// reflow metrics
WritingMode wm = aDesiredSize.GetWritingMode();
aDesiredSize.SetBlockStartAscent(fm->MaxAscent());
nscoord descent = fm->MaxDescent();
aDesiredSize.BSize(wm) = aDesiredSize.BlockStartAscent() + descent;
aDesiredSize.ISize(wm) = mBoundingMetrics.width;
// Also return our bounding metrics
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
return NS_OK;
}
class nsDisplayMathMLError : public nsDisplayItem {
public:
nsDisplayMathMLError(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
: nsDisplayItem(aBuilder, aFrame) {
MOZ_COUNT_CTOR(nsDisplayMathMLError);
}
#ifdef NS_BUILD_REFCNT_LOGGING
virtual ~nsDisplayMathMLError() {
MOZ_COUNT_DTOR(nsDisplayMathMLError);
}
#endif
virtual void Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx) override;
NS_DISPLAY_DECL_NAME("MathMLError", TYPE_MATHML_ERROR)
};
void nsDisplayMathMLError::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
// Set color and font ...
RefPtr<nsFontMetrics> fm;
nsLayoutUtils::GetFontMetricsForFrame(mFrame, getter_AddRefs(fm));
nsPoint pt = ToReferenceFrame();
int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
DrawTarget* drawTarget = aCtx->GetDrawTarget();
Rect rect = NSRectToSnappedRect(nsRect(pt, mFrame->GetSize()),
appUnitsPerDevPixel,
*drawTarget);
ColorPattern red(ToDeviceColor(Color(1.f, 0.f, 0.f, 1.f)));
drawTarget->FillRect(rect, red);
aCtx->ThebesContext()->SetColor(Color(1.f, 1.f, 1.f));
nscoord ascent = fm->MaxAscent();
NS_NAMED_LITERAL_STRING(errorMsg, "invalid-markup");
nsLayoutUtils::DrawUniDirString(errorMsg.get(), uint32_t(errorMsg.Length()),
nsPoint(pt.x, pt.y + ascent), *fm, *aCtx);
}
/* /////////////
* nsIMathMLFrame - support methods for stretchy elements
* =============================================================================
*/
static bool
IsForeignChild(const nsIFrame* aFrame)
{
// This counts nsMathMLmathBlockFrame as a foreign child, because it
// uses block reflow
return !(aFrame->IsFrameOfType(nsIFrame::eMathML)) ||
aFrame->GetType() == nsGkAtoms::blockFrame;
}
NS_DECLARE_FRAME_PROPERTY_DELETABLE(HTMLReflowMetricsProperty,
nsHTMLReflowMetrics)
/* static */ void
nsMathMLContainerFrame::SaveReflowAndBoundingMetricsFor(nsIFrame* aFrame,
const nsHTMLReflowMetrics& aReflowMetrics,
const nsBoundingMetrics& aBoundingMetrics)
{
nsHTMLReflowMetrics *metrics = new nsHTMLReflowMetrics(aReflowMetrics);
metrics->mBoundingMetrics = aBoundingMetrics;
aFrame->Properties().Set(HTMLReflowMetricsProperty(), metrics);
}
// helper method to facilitate getting the reflow and bounding metrics
/* static */ void
nsMathMLContainerFrame::GetReflowAndBoundingMetricsFor(nsIFrame* aFrame,
nsHTMLReflowMetrics& aReflowMetrics,
nsBoundingMetrics& aBoundingMetrics,
eMathMLFrameType* aMathMLFrameType)
{
NS_PRECONDITION(aFrame, "null arg");
nsHTMLReflowMetrics *metrics =
aFrame->Properties().Get(HTMLReflowMetricsProperty());
// IMPORTANT: This function is only meant to be called in Place() methods
// where it is assumed that SaveReflowAndBoundingMetricsFor has recorded the
// information.
NS_ASSERTION(metrics, "Didn't SaveReflowAndBoundingMetricsFor frame!");
if (metrics) {
aReflowMetrics = *metrics;
aBoundingMetrics = metrics->mBoundingMetrics;
}
if (aMathMLFrameType) {
if (!IsForeignChild(aFrame)) {
nsIMathMLFrame* mathMLFrame = do_QueryFrame(aFrame);
if (mathMLFrame) {
*aMathMLFrameType = mathMLFrame->GetMathMLFrameType();
return;
}
}
*aMathMLFrameType = eMathMLFrameType_UNKNOWN;
}
}
void
nsMathMLContainerFrame::ClearSavedChildMetrics()
{
nsIFrame* childFrame = mFrames.FirstChild();
FramePropertyTable* props = PresContext()->PropertyTable();
while (childFrame) {
props->Delete(childFrame, HTMLReflowMetricsProperty());
childFrame = childFrame->GetNextSibling();
}
}
// helper to get the preferred size that a container frame should use to fire
// the stretch on its stretchy child frames.
void
nsMathMLContainerFrame::GetPreferredStretchSize(DrawTarget* aDrawTarget,
uint32_t aOptions,
nsStretchDirection aStretchDirection,
nsBoundingMetrics& aPreferredStretchSize)
{
if (aOptions & STRETCH_CONSIDER_ACTUAL_SIZE) {
// when our actual size is ok, just use it
aPreferredStretchSize = mBoundingMetrics;
}
else if (aOptions & STRETCH_CONSIDER_EMBELLISHMENTS) {
// compute our up-to-date size using Place()
nsHTMLReflowMetrics metrics(GetWritingMode()); // ???
Place(aDrawTarget, false, metrics);
aPreferredStretchSize = metrics.mBoundingMetrics;
}
else {
// compute a size that includes embellishments iff the container stretches
// in the same direction as the embellished operator.
bool stretchAll = aStretchDirection == NS_STRETCH_DIRECTION_VERTICAL ?
NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(mPresentationData.flags) :
NS_MATHML_WILL_STRETCH_ALL_CHILDREN_HORIZONTALLY(mPresentationData.flags);
NS_ASSERTION(aStretchDirection == NS_STRETCH_DIRECTION_HORIZONTAL ||
aStretchDirection == NS_STRETCH_DIRECTION_VERTICAL,
"You must specify a direction in which to stretch");
NS_ASSERTION(NS_MATHML_IS_EMBELLISH_OPERATOR(mEmbellishData.flags) ||
stretchAll,
"invalid call to GetPreferredStretchSize");
bool firstTime = true;
nsBoundingMetrics bm, bmChild;
nsIFrame* childFrame =
stretchAll ? PrincipalChildList().FirstChild() : mPresentationData.baseFrame;
while (childFrame) {
// initializations in case this child happens not to be a MathML frame
nsIMathMLFrame* mathMLFrame = do_QueryFrame(childFrame);
if (mathMLFrame) {
nsEmbellishData embellishData;
nsPresentationData presentationData;
mathMLFrame->GetEmbellishData(embellishData);
mathMLFrame->GetPresentationData(presentationData);
if (NS_MATHML_IS_EMBELLISH_OPERATOR(embellishData.flags) &&
embellishData.direction == aStretchDirection &&
presentationData.baseFrame) {
// embellishements are not included, only consider the inner first child itself
// XXXkt Does that mean the core descendent frame should be used
// instead of the base child?
nsIMathMLFrame* mathMLchildFrame = do_QueryFrame(presentationData.baseFrame);
if (mathMLchildFrame) {
mathMLFrame = mathMLchildFrame;
}
}
mathMLFrame->GetBoundingMetrics(bmChild);
}
else {
nsHTMLReflowMetrics unused(GetWritingMode());
GetReflowAndBoundingMetricsFor(childFrame, unused, bmChild);
}
if (firstTime) {
firstTime = false;
bm = bmChild;
if (!stretchAll) {
// we may get here for cases such as <msup><mo>...</mo> ... </msup>,
// or <maction>...<mo>...</mo></maction>.
break;
}
}
else {
if (aStretchDirection == NS_STRETCH_DIRECTION_HORIZONTAL) {
// if we get here, it means this is container that will stack its children
// vertically and fire an horizontal stretch on each them. This is the case
// for \munder, \mover, \munderover. We just sum-up the size vertically.
bm.descent += bmChild.ascent + bmChild.descent;
// Sometimes non-spacing marks (when width is zero) are positioned
// to the left of the origin, but it is the distance between left
// and right bearing that is important rather than the offsets from
// the origin.
if (bmChild.width == 0) {
bmChild.rightBearing -= bmChild.leftBearing;
bmChild.leftBearing = 0;
}
if (bm.leftBearing > bmChild.leftBearing)
bm.leftBearing = bmChild.leftBearing;
if (bm.rightBearing < bmChild.rightBearing)
bm.rightBearing = bmChild.rightBearing;
}
else if (aStretchDirection == NS_STRETCH_DIRECTION_VERTICAL) {
// just sum-up the sizes horizontally.
bm += bmChild;
}
else {
NS_ERROR("unexpected case in GetPreferredStretchSize");
break;
}
}
childFrame = childFrame->GetNextSibling();
}
aPreferredStretchSize = bm;
}
}
NS_IMETHODIMP
nsMathMLContainerFrame::Stretch(DrawTarget* aDrawTarget,
nsStretchDirection aStretchDirection,
nsBoundingMetrics& aContainerSize,
nsHTMLReflowMetrics& aDesiredStretchSize)
{
if (NS_MATHML_IS_EMBELLISH_OPERATOR(mEmbellishData.flags)) {
if (NS_MATHML_STRETCH_WAS_DONE(mPresentationData.flags)) {
NS_WARNING("it is wrong to fire stretch more than once on a frame");
return NS_OK;
}
mPresentationData.flags |= NS_MATHML_STRETCH_DONE;
if (NS_MATHML_HAS_ERROR(mPresentationData.flags)) {
NS_WARNING("it is wrong to fire stretch on a erroneous frame");
return NS_OK;
}
// Pass the stretch to the base child ...
nsIFrame* baseFrame = mPresentationData.baseFrame;
if (baseFrame) {
nsIMathMLFrame* mathMLFrame = do_QueryFrame(baseFrame);
NS_ASSERTION(mathMLFrame, "Something is wrong somewhere");
if (mathMLFrame) {
// And the trick is that the child's rect.x is still holding the descent,
// and rect.y is still holding the ascent ...
nsHTMLReflowMetrics childSize(aDesiredStretchSize);
GetReflowAndBoundingMetricsFor(baseFrame, childSize, childSize.mBoundingMetrics);
// See if we should downsize and confine the stretch to us...
// XXX there may be other cases where we can downsize the stretch,
// e.g., the first ∑ might appear big in the following situation
// <math xmlns='http://www.w3.org/1998/Math/MathML'>
// <mstyle>
// <msub>
// <msub><mo>∑</mo><mfrac><mi>a</mi><mi>b</mi></mfrac></msub>
// <msub><mo>∑</mo><mfrac><mi>a</mi><mi>b</mi></mfrac></msub>
// </msub>
// </mstyle>
// </math>
nsBoundingMetrics containerSize = aContainerSize;
if (aStretchDirection != mEmbellishData.direction &&
mEmbellishData.direction != NS_STRETCH_DIRECTION_UNSUPPORTED) {
NS_ASSERTION(mEmbellishData.direction != NS_STRETCH_DIRECTION_DEFAULT,
"Stretches may have a default direction, operators can not.");
if (mEmbellishData.direction == NS_STRETCH_DIRECTION_VERTICAL ?
NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(mPresentationData.flags) :
NS_MATHML_WILL_STRETCH_ALL_CHILDREN_HORIZONTALLY(mPresentationData.flags)) {
GetPreferredStretchSize(aDrawTarget, 0,
mEmbellishData.direction, containerSize);
// Stop further recalculations
aStretchDirection = mEmbellishData.direction;
} else {
// We aren't going to stretch the child, so just use the child metrics.
containerSize = childSize.mBoundingMetrics;
}
}
// do the stretching...
mathMLFrame->Stretch(aDrawTarget,
aStretchDirection, containerSize, childSize);
// store the updated metrics
SaveReflowAndBoundingMetricsFor(baseFrame, childSize,
childSize.mBoundingMetrics);
// Remember the siblings which were _deferred_.
// Now that this embellished child may have changed, we need to
// fire the stretch on its siblings using our updated size
if (NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(mPresentationData.flags) ||
NS_MATHML_WILL_STRETCH_ALL_CHILDREN_HORIZONTALLY(mPresentationData.flags)) {
nsStretchDirection stretchDir =
NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(mPresentationData.flags) ?
NS_STRETCH_DIRECTION_VERTICAL : NS_STRETCH_DIRECTION_HORIZONTAL;
GetPreferredStretchSize(aDrawTarget, STRETCH_CONSIDER_EMBELLISHMENTS,
stretchDir, containerSize);
nsIFrame* childFrame = mFrames.FirstChild();
while (childFrame) {
if (childFrame != mPresentationData.baseFrame) {
mathMLFrame = do_QueryFrame(childFrame);
if (mathMLFrame) {
// retrieve the metrics that was stored at the previous pass
GetReflowAndBoundingMetricsFor(childFrame,
childSize, childSize.mBoundingMetrics);
// do the stretching...
mathMLFrame->Stretch(aDrawTarget, stretchDir,
containerSize, childSize);
// store the updated metrics
SaveReflowAndBoundingMetricsFor(childFrame, childSize,
childSize.mBoundingMetrics);
}
}
childFrame = childFrame->GetNextSibling();
}
}
// re-position all our children
nsresult rv = Place(aDrawTarget, true, aDesiredStretchSize);
if (NS_MATHML_HAS_ERROR(mPresentationData.flags) || NS_FAILED(rv)) {
// Make sure the child frames get their DidReflow() calls.
DidReflowChildren(mFrames.FirstChild());
}
// If our parent is not embellished, it means we are the outermost embellished
// container and so we put the spacing, otherwise we don't include the spacing,
// the outermost embellished container will take care of it.
nsEmbellishData parentData;
GetEmbellishDataFrom(GetParent(), parentData);
// ensure that we are the embellished child, not just a sibling
// (need to test coreFrame since <mfrac> resets other things)
if (parentData.coreFrame != mEmbellishData.coreFrame) {
// (we fetch values from the core since they may use units that depend
// on style data, and style changes could have occurred in the core since
// our last visit there)
nsEmbellishData coreData;
GetEmbellishDataFrom(mEmbellishData.coreFrame, coreData);
mBoundingMetrics.width +=
coreData.leadingSpace + coreData.trailingSpace;
aDesiredStretchSize.Width() = mBoundingMetrics.width;
aDesiredStretchSize.mBoundingMetrics.width = mBoundingMetrics.width;
nscoord dx = (StyleVisibility()->mDirection ?
coreData.trailingSpace : coreData.leadingSpace);
if (dx != 0) {
mBoundingMetrics.leftBearing += dx;
mBoundingMetrics.rightBearing += dx;
aDesiredStretchSize.mBoundingMetrics.leftBearing += dx;
aDesiredStretchSize.mBoundingMetrics.rightBearing += dx;
nsIFrame* childFrame = mFrames.FirstChild();
while (childFrame) {
childFrame->SetPosition(childFrame->GetPosition()
+ nsPoint(dx, 0));
childFrame = childFrame->GetNextSibling();
}
}
}
// Finished with these:
ClearSavedChildMetrics();
// Set our overflow area
GatherAndStoreOverflow(&aDesiredStretchSize);
}
}
}
return NS_OK;
}
nsresult
nsMathMLContainerFrame::FinalizeReflow(DrawTarget* aDrawTarget,
nsHTMLReflowMetrics& aDesiredSize)
{
// During reflow, we use rect.x and rect.y as placeholders for the child's ascent
// and descent in expectation of a stretch command. Hence we need to ensure that
// a stretch command will actually be fired later on, after exiting from our
// reflow. If the stretch is not fired, the rect.x, and rect.y will remain
// with inappropriate data causing children to be improperly positioned.
// This helper method checks to see if our parent will fire a stretch command
// targeted at us. If not, we go ahead and fire an involutive stretch on
// ourselves. This will clear all the rect.x and rect.y, and return our
// desired size.
// First, complete the post-reflow hook.
// We use the information in our children rectangles to position them.
// If placeOrigin==false, then Place() will not touch rect.x, and rect.y.
// They will still be holding the ascent and descent for each child.
// The first clause caters for any non-embellished container.
// The second clause is for a container which won't fire stretch even though it is
// embellished, e.g., as in <mfrac><mo>...</mo> ... </mfrac>, the test is convoluted
// because it excludes the particular case of the core <mo>...</mo> itself.
// (<mo> needs to fire stretch on its MathMLChar in any case to initialize it)
bool placeOrigin = !NS_MATHML_IS_EMBELLISH_OPERATOR(mEmbellishData.flags) ||
(mEmbellishData.coreFrame != this && !mPresentationData.baseFrame &&
mEmbellishData.direction == NS_STRETCH_DIRECTION_UNSUPPORTED);
nsresult rv = Place(aDrawTarget, placeOrigin, aDesiredSize);
// Place() will call FinishReflowChild() when placeOrigin is true but if
// it returns before reaching FinishReflowChild() due to errors we need
// to fulfill the reflow protocol by calling DidReflow for the child frames
// that still needs it here (or we may crash - bug 366012).
// If placeOrigin is false we should reach Place() with aPlaceOrigin == true
// through Stretch() eventually.
if (NS_MATHML_HAS_ERROR(mPresentationData.flags) || NS_FAILED(rv)) {
GatherAndStoreOverflow(&aDesiredSize);
DidReflowChildren(PrincipalChildList().FirstChild());
return rv;
}
bool parentWillFireStretch = false;
if (!placeOrigin) {
// This means the rect.x and rect.y of our children were not set!!
// Don't go without checking to see if our parent will later fire a Stretch() command
// targeted at us. The Stretch() will cause the rect.x and rect.y to clear...
nsIMathMLFrame* mathMLFrame = do_QueryFrame(GetParent());
if (mathMLFrame) {
nsEmbellishData embellishData;
nsPresentationData presentationData;
mathMLFrame->GetEmbellishData(embellishData);
mathMLFrame->GetPresentationData(presentationData);
if (NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(presentationData.flags) ||
NS_MATHML_WILL_STRETCH_ALL_CHILDREN_HORIZONTALLY(presentationData.flags) ||
(NS_MATHML_IS_EMBELLISH_OPERATOR(embellishData.flags)
&& presentationData.baseFrame == this))
{
parentWillFireStretch = true;
}
}
if (!parentWillFireStretch) {
// There is nobody who will fire the stretch for us, we do it ourselves!
bool stretchAll =
/* NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(mPresentationData.flags) || */
NS_MATHML_WILL_STRETCH_ALL_CHILDREN_HORIZONTALLY(mPresentationData.flags);
nsStretchDirection stretchDir;
if (mEmbellishData.coreFrame == this || /* case of a bare <mo>...</mo> itself */
(mEmbellishData.direction == NS_STRETCH_DIRECTION_HORIZONTAL &&
stretchAll) || /* or <mover><mo>...</mo>...</mover>, or friends */
mEmbellishData.direction == NS_STRETCH_DIRECTION_UNSUPPORTED) { /* Doesn't stretch */
stretchDir = mEmbellishData.direction;
} else {
// Let the Stretch() call decide the direction.
stretchDir = NS_STRETCH_DIRECTION_DEFAULT;
}
// Use our current size as computed earlier by Place()
// The stretch call will detect if this is incorrect and recalculate the size.
nsBoundingMetrics defaultSize = aDesiredSize.mBoundingMetrics;
Stretch(aDrawTarget, stretchDir, defaultSize, aDesiredSize);
#ifdef DEBUG
{
// The Place() call above didn't request FinishReflowChild(),
// so let's check that we eventually did through Stretch().
for (nsIFrame* childFrame : PrincipalChildList()) {
NS_ASSERTION(!(childFrame->GetStateBits() & NS_FRAME_IN_REFLOW),
"DidReflow() was never called");
}
}
#endif
}
}
// Also return our bounding metrics
aDesiredSize.mBoundingMetrics = mBoundingMetrics;
// see if we should fix the spacing
FixInterFrameSpacing(aDesiredSize);
if (!parentWillFireStretch) {
// Not expecting a stretch.
// Finished with these:
ClearSavedChildMetrics();
// Set our overflow area.
GatherAndStoreOverflow(&aDesiredSize);
}
return NS_OK;
}
/* /////////////
* nsIMathMLFrame - support methods for scripting elements (nested frames
* within msub, msup, msubsup, munder, mover, munderover, mmultiscripts,
* mfrac, mroot, mtable).
* =============================================================================
*/
// helper to let the update of presentation data pass through
// a subtree that may contain non-mathml container frames
/* static */ void
nsMathMLContainerFrame::PropagatePresentationDataFor(nsIFrame* aFrame,
uint32_t aFlagsValues,
uint32_t aFlagsToUpdate)
{
if (!aFrame || !aFlagsToUpdate)
return;
nsIMathMLFrame* mathMLFrame = do_QueryFrame(aFrame);
if (mathMLFrame) {
// update
mathMLFrame->UpdatePresentationData(aFlagsValues,
aFlagsToUpdate);
// propagate using the base method to make sure that the control
// is passed on to MathML frames that may be overloading the method
mathMLFrame->UpdatePresentationDataFromChildAt(0, -1,
aFlagsValues, aFlagsToUpdate);
}
else {
// propagate down the subtrees
for (nsIFrame* childFrame : aFrame->PrincipalChildList()) {
PropagatePresentationDataFor(childFrame,
aFlagsValues, aFlagsToUpdate);
}
}
}
/* static */ void
nsMathMLContainerFrame::PropagatePresentationDataFromChildAt(nsIFrame* aParentFrame,
int32_t aFirstChildIndex,
int32_t aLastChildIndex,
uint32_t aFlagsValues,
uint32_t aFlagsToUpdate)
{
if (!aParentFrame || !aFlagsToUpdate)
return;
int32_t index = 0;
for (nsIFrame* childFrame : aParentFrame->PrincipalChildList()) {
if ((index >= aFirstChildIndex) &&
((aLastChildIndex <= 0) || ((aLastChildIndex > 0) &&
(index <= aLastChildIndex)))) {
PropagatePresentationDataFor(childFrame,
aFlagsValues, aFlagsToUpdate);
}
index++;
}
}
/* //////////////////
* Frame construction
* =============================================================================
*/
void
nsMathMLContainerFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
// report an error if something wrong was found in this frame
if (NS_MATHML_HAS_ERROR(mPresentationData.flags)) {
if (!IsVisibleForPainting(aBuilder))
return;
aLists.Content()->AppendNewToTop(
new (aBuilder) nsDisplayMathMLError(aBuilder, this));
return;
}
DisplayBorderBackgroundOutline(aBuilder, aLists);
BuildDisplayListForNonBlockChildren(aBuilder, aDirtyRect, aLists,
DISPLAY_CHILD_INLINE);
#if defined(DEBUG) && defined(SHOW_BOUNDING_BOX)
// for visual debug
// ----------------
// if you want to see your bounding box, make sure to properly fill
// your mBoundingMetrics and mReference point, and set
// mPresentationData.flags |= NS_MATHML_SHOW_BOUNDING_METRICS
// in the Init() of your sub-class
DisplayBoundingMetrics(aBuilder, this, mReference, mBoundingMetrics, aLists);
#endif
}
// Note that this method re-builds the automatic data in the children -- not
// in aParentFrame itself (except for those particular operations that the
// parent frame may do in its TransmitAutomaticData()).
/* static */ void
nsMathMLContainerFrame::RebuildAutomaticDataForChildren(nsIFrame* aParentFrame)
{
// 1. As we descend the tree, make each child frame inherit data from
// the parent
// 2. As we ascend the tree, transmit any specific change that we want
// down the subtrees
for (nsIFrame* childFrame : aParentFrame->PrincipalChildList()) {
nsIMathMLFrame* childMathMLFrame = do_QueryFrame(childFrame);
if (childMathMLFrame) {
childMathMLFrame->InheritAutomaticData(aParentFrame);
}
RebuildAutomaticDataForChildren(childFrame);
}
nsIMathMLFrame* mathMLFrame = do_QueryFrame(aParentFrame);
if (mathMLFrame) {
mathMLFrame->TransmitAutomaticData();
}
}
/* static */ nsresult
nsMathMLContainerFrame::ReLayoutChildren(nsIFrame* aParentFrame)
{
if (!aParentFrame)
return NS_OK;
// walk-up to the first frame that is a MathML frame, stop if we reach <math>
nsIFrame* frame = aParentFrame;
while (1) {
nsIFrame* parent = frame->GetParent();
if (!parent || !parent->GetContent())
break;
// stop if it is a MathML frame
nsIMathMLFrame* mathMLFrame = do_QueryFrame(frame);
if (mathMLFrame)
break;
// stop if we reach the root <math> tag
nsIContent* content = frame->GetContent();
NS_ASSERTION(content, "dangling frame without a content node");
if (!content)
break;
if (content->IsMathMLElement(nsGkAtoms::math))
break;
frame = parent;
}
// re-sync the presentation data and embellishment data of our children
RebuildAutomaticDataForChildren(frame);
// Ask our parent frame to reflow us
nsIFrame* parent = frame->GetParent();
NS_ASSERTION(parent, "No parent to pass the reflow request up to");
if (!parent)
return NS_OK;
frame->PresContext()->PresShell()->
FrameNeedsReflow(frame, nsIPresShell::eStyleChange, NS_FRAME_IS_DIRTY);
return NS_OK;
}
// There are precise rules governing children of a MathML frame,
// and properties such as the scriptlevel depends on those rules.
// Hence for things to work, callers must use Append/Insert/etc wisely.
nsresult
nsMathMLContainerFrame::ChildListChanged(int32_t aModType)
{
// If this is an embellished frame we need to rebuild the
// embellished hierarchy by walking-up to the parent of the
// outermost embellished container.
nsIFrame* frame = this;
if (mEmbellishData.coreFrame) {
nsIFrame* parent = GetParent();
nsEmbellishData embellishData;
for ( ; parent; frame = parent, parent = parent->GetParent()) {
GetEmbellishDataFrom(parent, embellishData);
if (embellishData.coreFrame != mEmbellishData.coreFrame)
break;
}
}
return ReLayoutChildren(frame);
}
void
nsMathMLContainerFrame::AppendFrames(ChildListID aListID,
nsFrameList& aFrameList)
{
MOZ_ASSERT(aListID == kPrincipalList);
mFrames.AppendFrames(this, aFrameList);
ChildListChanged(nsIDOMMutationEvent::ADDITION);
}
void
nsMathMLContainerFrame::InsertFrames(ChildListID aListID,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList)
{
MOZ_ASSERT(aListID == kPrincipalList);
mFrames.InsertFrames(this, aPrevFrame, aFrameList);
ChildListChanged(nsIDOMMutationEvent::ADDITION);
}
void
nsMathMLContainerFrame::RemoveFrame(ChildListID aListID,
nsIFrame* aOldFrame)
{
MOZ_ASSERT(aListID == kPrincipalList);
mFrames.DestroyFrame(aOldFrame);
ChildListChanged(nsIDOMMutationEvent::REMOVAL);
}
nsresult
nsMathMLContainerFrame::AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
// XXX Since they are numerous MathML attributes that affect layout, and
// we can't check all of them here, play safe by requesting a reflow.
// XXXldb This should only do work for attributes that cause changes!
PresContext()->PresShell()->
FrameNeedsReflow(this, nsIPresShell::eStyleChange, NS_FRAME_IS_DIRTY);
return NS_OK;
}
void
nsMathMLContainerFrame::GatherAndStoreOverflow(nsHTMLReflowMetrics* aMetrics)
{
// nsIFrame::FinishAndStoreOverflow likes the overflow area to include the
// frame rectangle.
aMetrics->SetOverflowAreasToDesiredBounds();
// All non-child-frame content such as nsMathMLChars (and most child-frame
// content) is included in mBoundingMetrics.
nsRect boundingBox(mBoundingMetrics.leftBearing,
aMetrics->BlockStartAscent() - mBoundingMetrics.ascent,
mBoundingMetrics.rightBearing - mBoundingMetrics.leftBearing,
mBoundingMetrics.ascent + mBoundingMetrics.descent);
// REVIEW: Maybe this should contribute only to visual overflow
// and not scrollable?
aMetrics->mOverflowAreas.UnionAllWith(boundingBox);
// mBoundingMetrics does not necessarily include content of <mpadded>
// elements whose mBoundingMetrics may not be representative of the true
// bounds, and doesn't include the CSS2 outline rectangles of children, so
// make such to include child overflow areas.
nsIFrame* childFrame = mFrames.FirstChild();
while (childFrame) {
ConsiderChildOverflow(aMetrics->mOverflowAreas, childFrame);
childFrame = childFrame->GetNextSibling();
}
FinishAndStoreOverflow(aMetrics);
}
bool
nsMathMLContainerFrame::UpdateOverflow()
{
// Our overflow areas may have changed, so reflow the frame.
PresContext()->PresShell()->FrameNeedsReflow(
this, nsIPresShell::eResize, NS_FRAME_IS_DIRTY);
// As we're reflowing, there's no need to propagate this change.
return false;
}
void
nsMathMLContainerFrame::ReflowChild(nsIFrame* aChildFrame,
nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
// Having foreign/hybrid children, e.g., from html markups, is not defined by
// the MathML spec. But it can happen in practice, e.g., <html:img> allows us
// to do some cool demos... or we may have a child that is an nsInlineFrame
// from a generated content such as :before { content: open-quote } or
// :after { content: close-quote }. Unfortunately, the other frames out-there
// may expect their own invariants that are not met when we mix things.
// Hence we do not claim their support, but we will nevertheless attempt to keep
// them in the flow, if we can get their desired size. We observed that most
// frames may be reflowed generically, but nsInlineFrames need extra care.
#ifdef DEBUG
nsInlineFrame* inlineFrame = do_QueryFrame(aChildFrame);
NS_ASSERTION(!inlineFrame, "Inline frames should be wrapped in blocks");
#endif
nsContainerFrame::
ReflowChild(aChildFrame, aPresContext, aDesiredSize, aReflowState,
0, 0, NS_FRAME_NO_MOVE_FRAME, aStatus);
if (aDesiredSize.BlockStartAscent() == nsHTMLReflowMetrics::ASK_FOR_BASELINE) {
// This will be suitable for inline frames, which are wrapped in a block.
nscoord ascent;
WritingMode wm = aDesiredSize.GetWritingMode();
if (!nsLayoutUtils::GetLastLineBaseline(wm, aChildFrame, &ascent)) {
// We don't expect any other block children so just place the frame on
// the baseline instead of going through DidReflow() and
// GetBaseline(). This is what nsFrame::GetBaseline() will do anyway.
aDesiredSize.SetBlockStartAscent(aDesiredSize.BSize(wm));
} else {
aDesiredSize.SetBlockStartAscent(ascent);
}
}
if (IsForeignChild(aChildFrame)) {
// use ComputeTightBounds API as aDesiredSize.mBoundingMetrics is not set.
nsRect r = aChildFrame->ComputeTightBounds(aReflowState.rendContext->GetDrawTarget());
aDesiredSize.mBoundingMetrics.leftBearing = r.x;
aDesiredSize.mBoundingMetrics.rightBearing = r.XMost();
aDesiredSize.mBoundingMetrics.ascent = aDesiredSize.BlockStartAscent() - r.y;
aDesiredSize.mBoundingMetrics.descent = r.YMost() - aDesiredSize.BlockStartAscent();
aDesiredSize.mBoundingMetrics.width = aDesiredSize.Width();
}
}
void
nsMathMLContainerFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
MarkInReflow();
mPresentationData.flags &= ~NS_MATHML_ERROR;
aDesiredSize.Width() = aDesiredSize.Height() = 0;
aDesiredSize.SetBlockStartAscent(0);
aDesiredSize.mBoundingMetrics = nsBoundingMetrics();
/////////////
// Reflow children
// Asking each child to cache its bounding metrics
nsReflowStatus childStatus;
nsIFrame* childFrame = mFrames.FirstChild();
while (childFrame) {
nsHTMLReflowMetrics childDesiredSize(aReflowState, // ???
aDesiredSize.mFlags);
WritingMode wm = childFrame->GetWritingMode();
LogicalSize availSize = aReflowState.ComputedSize(wm);
availSize.BSize(wm) = NS_UNCONSTRAINEDSIZE;
nsHTMLReflowState childReflowState(aPresContext, aReflowState,
childFrame, availSize);
ReflowChild(childFrame, aPresContext, childDesiredSize,
childReflowState, childStatus);
//NS_ASSERTION(NS_FRAME_IS_COMPLETE(childStatus), "bad status");
SaveReflowAndBoundingMetricsFor(childFrame, childDesiredSize,
childDesiredSize.mBoundingMetrics);
childFrame = childFrame->GetNextSibling();
}
/////////////
// If we are a container which is entitled to stretch its children, then we
// ask our stretchy children to stretch themselves
// The stretching of siblings of an embellished child is _deferred_ until
// after finishing the stretching of the embellished child - bug 117652
DrawTarget* drawTarget = aReflowState.rendContext->GetDrawTarget();
if (!NS_MATHML_IS_EMBELLISH_OPERATOR(mEmbellishData.flags) &&
(NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(mPresentationData.flags) ||
NS_MATHML_WILL_STRETCH_ALL_CHILDREN_HORIZONTALLY(mPresentationData.flags))) {
// get the stretchy direction
nsStretchDirection stretchDir =
NS_MATHML_WILL_STRETCH_ALL_CHILDREN_VERTICALLY(mPresentationData.flags)
? NS_STRETCH_DIRECTION_VERTICAL
: NS_STRETCH_DIRECTION_HORIZONTAL;
// what size should we use to stretch our stretchy children
// We don't use STRETCH_CONSIDER_ACTUAL_SIZE -- because our size is not known yet
// We don't use STRETCH_CONSIDER_EMBELLISHMENTS -- because we don't want to
// include them in the caculations of the size of stretchy elements
nsBoundingMetrics containerSize;
GetPreferredStretchSize(drawTarget, 0, stretchDir, containerSize);
// fire the stretch on each child
childFrame = mFrames.FirstChild();
while (childFrame) {
nsIMathMLFrame* mathMLFrame = do_QueryFrame(childFrame);
if (mathMLFrame) {
// retrieve the metrics that was stored at the previous pass
nsHTMLReflowMetrics childDesiredSize(aReflowState);
GetReflowAndBoundingMetricsFor(childFrame,
childDesiredSize, childDesiredSize.mBoundingMetrics);
mathMLFrame->Stretch(drawTarget, stretchDir,
containerSize, childDesiredSize);
// store the updated metrics
SaveReflowAndBoundingMetricsFor(childFrame, childDesiredSize,
childDesiredSize.mBoundingMetrics);
}
childFrame = childFrame->GetNextSibling();
}
}
/////////////
// Place children now by re-adjusting the origins to align the baselines
FinalizeReflow(drawTarget, aDesiredSize);
aStatus = NS_FRAME_COMPLETE;
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
}
static nscoord AddInterFrameSpacingToSize(nsHTMLReflowMetrics& aDesiredSize,
nsMathMLContainerFrame* aFrame);
/* virtual */ void
nsMathMLContainerFrame::MarkIntrinsicISizesDirty()
{
mIntrinsicWidth = NS_INTRINSIC_WIDTH_UNKNOWN;
nsContainerFrame::MarkIntrinsicISizesDirty();
}
void
nsMathMLContainerFrame::UpdateIntrinsicWidth(nsRenderingContext* aRenderingContext)
{
if (mIntrinsicWidth == NS_INTRINSIC_WIDTH_UNKNOWN) {
nsHTMLReflowMetrics desiredSize(GetWritingMode());
GetIntrinsicISizeMetrics(aRenderingContext, desiredSize);
// Include the additional width added by FixInterFrameSpacing to ensure
// consistent width calculations.
AddInterFrameSpacingToSize(desiredSize, this);
mIntrinsicWidth = desiredSize.ISize(GetWritingMode());
}
}
/* virtual */ nscoord
nsMathMLContainerFrame::GetMinISize(nsRenderingContext* aRenderingContext)
{
nscoord result;
DISPLAY_MIN_WIDTH(this, result);
UpdateIntrinsicWidth(aRenderingContext);
result = mIntrinsicWidth;
return result;
}
/* virtual */ nscoord