forked from mozilla/gecko-dev
-
Notifications
You must be signed in to change notification settings - Fork 1
/
nsBaseDragService.cpp
841 lines (722 loc) · 25.4 KB
/
nsBaseDragService.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
/* -*- 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 "nsBaseDragService.h"
#include "nsITransferable.h"
#include "nsIServiceManager.h"
#include "nsITransferable.h"
#include "nsSize.h"
#include "nsXPCOM.h"
#include "nsISupportsPrimitives.h"
#include "nsCOMPtr.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIFrame.h"
#include "nsIDocument.h"
#include "nsIContent.h"
#include "nsIPresShell.h"
#include "nsViewManager.h"
#include "nsIDOMNode.h"
#include "nsIDOMDragEvent.h"
#include "nsISelection.h"
#include "nsISelectionPrivate.h"
#include "nsPresContext.h"
#include "nsIDOMDataTransfer.h"
#include "nsIImageLoadingContent.h"
#include "imgIContainer.h"
#include "imgIRequest.h"
#include "ImageRegion.h"
#include "nsRegion.h"
#include "nsXULPopupManager.h"
#include "nsMenuPopupFrame.h"
#include "SVGImageContext.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/Preferences.h"
#include "mozilla/dom/DataTransferItemList.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/Unused.h"
#include "nsFrameLoader.h"
#include "TabParent.h"
#include "gfxContext.h"
#include "gfxPlatform.h"
#include <algorithm>
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::gfx;
using namespace mozilla::image;
#define DRAGIMAGES_PREF "nglayout.enable_drag_images"
nsBaseDragService::nsBaseDragService()
: mCanDrop(false), mOnlyChromeDrop(false), mDoingDrag(false),
mHasImage(false), mUserCancelled(false),
mDragEventDispatchedToChildProcess(false),
mDragAction(DRAGDROP_ACTION_NONE),
mDragActionFromChildProcess(DRAGDROP_ACTION_UNINITIALIZED), mTargetSize(0,0),
mContentPolicyType(nsIContentPolicy::TYPE_OTHER),
mSuppressLevel(0), mInputSource(nsIDOMMouseEvent::MOZ_SOURCE_MOUSE)
{
}
nsBaseDragService::~nsBaseDragService() = default;
NS_IMPL_ISUPPORTS(nsBaseDragService, nsIDragService, nsIDragSession)
//---------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::SetCanDrop(bool aCanDrop)
{
mCanDrop = aCanDrop;
return NS_OK;
}
//---------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::GetCanDrop(bool * aCanDrop)
{
*aCanDrop = mCanDrop;
return NS_OK;
}
//---------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::SetOnlyChromeDrop(bool aOnlyChrome)
{
mOnlyChromeDrop = aOnlyChrome;
return NS_OK;
}
//---------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::GetOnlyChromeDrop(bool* aOnlyChrome)
{
*aOnlyChrome = mOnlyChromeDrop;
return NS_OK;
}
//---------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::SetDragAction(uint32_t anAction)
{
mDragAction = anAction;
return NS_OK;
}
//---------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::GetDragAction(uint32_t * anAction)
{
*anAction = mDragAction;
return NS_OK;
}
//---------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::SetTargetSize(nsSize aDragTargetSize)
{
mTargetSize = aDragTargetSize;
return NS_OK;
}
//---------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::GetTargetSize(nsSize * aDragTargetSize)
{
*aDragTargetSize = mTargetSize;
return NS_OK;
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::GetNumDropItems(uint32_t * aNumItems)
{
*aNumItems = 0;
return NS_ERROR_FAILURE;
}
//
// GetSourceDocument
//
// Returns the DOM document where the drag was initiated. This will be
// nullptr if the drag began outside of our application.
//
NS_IMETHODIMP
nsBaseDragService::GetSourceDocument(nsIDOMDocument** aSourceDocument)
{
*aSourceDocument = mSourceDocument.get();
NS_IF_ADDREF(*aSourceDocument);
return NS_OK;
}
//
// GetSourceNode
//
// Returns the DOM node where the drag was initiated. This will be
// nullptr if the drag began outside of our application.
//
NS_IMETHODIMP
nsBaseDragService::GetSourceNode(nsIDOMNode** aSourceNode)
{
*aSourceNode = mSourceNode.get();
NS_IF_ADDREF(*aSourceNode);
return NS_OK;
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::GetData(nsITransferable * aTransferable,
uint32_t aItemIndex)
{
return NS_ERROR_FAILURE;
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::IsDataFlavorSupported(const char *aDataFlavor,
bool *_retval)
{
return NS_ERROR_FAILURE;
}
NS_IMETHODIMP
nsBaseDragService::GetDataTransfer(nsIDOMDataTransfer** aDataTransfer)
{
*aDataTransfer = mDataTransfer;
NS_IF_ADDREF(*aDataTransfer);
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragService::SetDataTransfer(nsIDOMDataTransfer* aDataTransfer)
{
mDataTransfer = aDataTransfer;
return NS_OK;
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::InvokeDragSession(nsIDOMNode *aDOMNode,
nsIArray* aTransferableArray,
nsIScriptableRegion* aDragRgn,
uint32_t aActionType,
nsContentPolicyType aContentPolicyType =
nsIContentPolicy::TYPE_OTHER)
{
AUTO_PROFILER_LABEL("nsBaseDragService::InvokeDragSession", OTHER);
NS_ENSURE_TRUE(aDOMNode, NS_ERROR_INVALID_ARG);
NS_ENSURE_TRUE(mSuppressLevel == 0, NS_ERROR_FAILURE);
// stash the document of the dom node
aDOMNode->GetOwnerDocument(getter_AddRefs(mSourceDocument));
mSourceNode = aDOMNode;
mContentPolicyType = aContentPolicyType;
mEndDragPoint = LayoutDeviceIntPoint(0, 0);
// When the mouse goes down, the selection code starts a mouse
// capture. However, this gets in the way of determining drag
// feedback for things like trees because the event coordinates
// are in the wrong coord system, so turn off mouse capture.
nsIPresShell::ClearMouseCapture(nullptr);
nsresult rv = InvokeDragSessionImpl(aTransferableArray,
aDragRgn, aActionType);
if (NS_FAILED(rv)) {
mSourceNode = nullptr;
mSourceDocument = nullptr;
}
return rv;
}
NS_IMETHODIMP
nsBaseDragService::InvokeDragSessionWithImage(nsIDOMNode* aDOMNode,
nsIArray* aTransferableArray,
nsIScriptableRegion* aRegion,
uint32_t aActionType,
nsIDOMNode* aImage,
int32_t aImageX, int32_t aImageY,
nsIDOMDragEvent* aDragEvent,
nsIDOMDataTransfer* aDataTransfer)
{
NS_ENSURE_TRUE(aDragEvent, NS_ERROR_NULL_POINTER);
NS_ENSURE_TRUE(aDataTransfer, NS_ERROR_NULL_POINTER);
NS_ENSURE_TRUE(mSuppressLevel == 0, NS_ERROR_FAILURE);
mDataTransfer = aDataTransfer;
mSelection = nullptr;
mHasImage = true;
mDragPopup = nullptr;
mImage = aImage;
mImageOffset = CSSIntPoint(aImageX, aImageY);
aDragEvent->GetScreenX(&mScreenPosition.x);
aDragEvent->GetScreenY(&mScreenPosition.y);
aDragEvent->GetMozInputSource(&mInputSource);
nsresult rv = InvokeDragSession(aDOMNode, aTransferableArray,
aRegion, aActionType,
nsIContentPolicy::TYPE_INTERNAL_IMAGE);
if (NS_FAILED(rv)) {
mImage = nullptr;
mHasImage = false;
mDataTransfer = nullptr;
}
return rv;
}
NS_IMETHODIMP
nsBaseDragService::InvokeDragSessionWithSelection(nsISelection* aSelection,
nsIArray* aTransferableArray,
uint32_t aActionType,
nsIDOMDragEvent* aDragEvent,
nsIDOMDataTransfer* aDataTransfer)
{
NS_ENSURE_TRUE(aSelection, NS_ERROR_NULL_POINTER);
NS_ENSURE_TRUE(aDragEvent, NS_ERROR_NULL_POINTER);
NS_ENSURE_TRUE(mSuppressLevel == 0, NS_ERROR_FAILURE);
mDataTransfer = aDataTransfer;
mSelection = aSelection;
mHasImage = true;
mDragPopup = nullptr;
mImage = nullptr;
mImageOffset = CSSIntPoint();
aDragEvent->GetScreenX(&mScreenPosition.x);
aDragEvent->GetScreenY(&mScreenPosition.y);
aDragEvent->GetMozInputSource(&mInputSource);
// just get the focused node from the selection
// XXXndeakin this should actually be the deepest node that contains both
// endpoints of the selection
nsCOMPtr<nsIDOMNode> node;
aSelection->GetFocusNode(getter_AddRefs(node));
nsresult rv = InvokeDragSession(node, aTransferableArray,
nullptr, aActionType,
nsIContentPolicy::TYPE_OTHER);
if (NS_FAILED(rv)) {
mHasImage = false;
mSelection = nullptr;
mDataTransfer = nullptr;
}
return rv;
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::GetCurrentSession(nsIDragSession ** aSession)
{
if (!aSession)
return NS_ERROR_INVALID_ARG;
// "this" also implements a drag session, so say we are one but only
// if there is currently a drag going on.
if (!mSuppressLevel && mDoingDrag) {
*aSession = this;
NS_ADDREF(*aSession); // addRef because we're a "getter"
}
else
*aSession = nullptr;
return NS_OK;
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::StartDragSession()
{
if (mDoingDrag) {
return NS_ERROR_FAILURE;
}
mDoingDrag = true;
// By default dispatch drop also to content.
mOnlyChromeDrop = false;
return NS_OK;
}
void
nsBaseDragService::OpenDragPopup()
{
if (mDragPopup) {
nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
if (pm) {
pm->ShowPopupAtScreen(mDragPopup, mScreenPosition.x - mImageOffset.x,
mScreenPosition.y - mImageOffset.y, false, nullptr);
}
}
}
int32_t
nsBaseDragService::TakeChildProcessDragAction()
{
// If the last event was dispatched to the child process, use the drag action
// assigned from it instead and return it. DRAGDROP_ACTION_UNINITIALIZED is
// returned otherwise.
int32_t retval = DRAGDROP_ACTION_UNINITIALIZED;
if (TakeDragEventDispatchedToChildProcess() &&
mDragActionFromChildProcess != DRAGDROP_ACTION_UNINITIALIZED) {
retval = mDragActionFromChildProcess;
}
return retval;
}
//-------------------------------------------------------------------------
NS_IMETHODIMP
nsBaseDragService::EndDragSession(bool aDoneDrag, uint32_t aKeyModifiers)
{
if (!mDoingDrag) {
return NS_ERROR_FAILURE;
}
if (aDoneDrag && !mSuppressLevel) {
FireDragEventAtSource(eDragEnd, aKeyModifiers);
}
if (mDragPopup) {
nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
if (pm) {
pm->HidePopup(mDragPopup, false, true, false, false);
}
}
for (uint32_t i = 0; i < mChildProcesses.Length(); ++i) {
mozilla::Unused << mChildProcesses[i]->SendEndDragSession(aDoneDrag,
mUserCancelled,
mEndDragPoint,
aKeyModifiers);
}
mChildProcesses.Clear();
// mDataTransfer and the items it owns are going to die anyway, but we
// explicitly deref the contained data here so that we don't have to wait for
// CC to reclaim the memory.
if (XRE_IsParentProcess()) {
DiscardInternalTransferData();
}
mDoingDrag = false;
mCanDrop = false;
// release the source we've been holding on to.
mSourceDocument = nullptr;
mSourceNode = nullptr;
mSelection = nullptr;
mDataTransfer = nullptr;
mHasImage = false;
mUserCancelled = false;
mDragPopup = nullptr;
mImage = nullptr;
mImageOffset = CSSIntPoint();
mScreenPosition = CSSIntPoint();
mEndDragPoint = LayoutDeviceIntPoint(0, 0);
mInputSource = nsIDOMMouseEvent::MOZ_SOURCE_MOUSE;
return NS_OK;
}
void
nsBaseDragService::DiscardInternalTransferData()
{
if (mDataTransfer && mSourceNode) {
MOZ_ASSERT(!!DataTransfer::Cast(mDataTransfer));
DataTransferItemList* items = DataTransfer::Cast(mDataTransfer)->Items();
for (size_t i = 0; i < items->Length(); i++) {
bool found;
DataTransferItem* item = items->IndexedGetter(i, found);
// Non-OTHER items may still be needed by JS. Skip them.
if (!found || item->Kind() != DataTransferItem::KIND_OTHER) {
continue;
}
nsCOMPtr<nsIVariant> variant = item->DataNoSecurityCheck();
nsCOMPtr<nsIWritableVariant> writable = do_QueryInterface(variant);
if (writable) {
writable->SetAsEmpty();
}
}
}
}
NS_IMETHODIMP
nsBaseDragService::FireDragEventAtSource(EventMessage aEventMessage,
uint32_t aKeyModifiers)
{
if (mSourceNode && !mSuppressLevel) {
nsCOMPtr<nsIDocument> doc = do_QueryInterface(mSourceDocument);
if (doc) {
nsCOMPtr<nsIPresShell> presShell = doc->GetShell();
if (presShell) {
nsEventStatus status = nsEventStatus_eIgnore;
WidgetDragEvent event(true, aEventMessage, nullptr);
event.inputSource = mInputSource;
if (aEventMessage == eDragEnd) {
event.mRefPoint = mEndDragPoint;
event.mUserCancelled = mUserCancelled;
}
event.mModifiers = aKeyModifiers;
// Send the drag event to APZ, which needs to know about them to be
// able to accurately detect the end of a drag gesture.
if (nsPresContext* presContext = presShell->GetPresContext()) {
if (nsCOMPtr<nsIWidget> widget = presContext->GetRootWidget()) {
widget->DispatchEventToAPZOnly(&event);
}
}
nsCOMPtr<nsIContent> content = do_QueryInterface(mSourceNode);
return presShell->HandleDOMEventWithTarget(content, &event, &status);
}
}
}
return NS_OK;
}
/* This is used by Windows and Mac to update the position of a popup being
* used as a drag image during the drag. This isn't used on GTK as it manages
* the drag popup itself.
*/
NS_IMETHODIMP
nsBaseDragService::DragMoved(int32_t aX, int32_t aY)
{
if (mDragPopup) {
nsIFrame* frame = mDragPopup->GetPrimaryFrame();
if (frame && frame->IsMenuPopupFrame()) {
CSSIntPoint cssPos = RoundedToInt(LayoutDeviceIntPoint(aX, aY) /
frame->PresContext()->CSSToDevPixelScale()) - mImageOffset;
(static_cast<nsMenuPopupFrame *>(frame))->MoveTo(cssPos, true);
}
}
return NS_OK;
}
static nsIPresShell*
GetPresShellForContent(nsIDOMNode* aDOMNode)
{
nsCOMPtr<nsIContent> content = do_QueryInterface(aDOMNode);
if (!content)
return nullptr;
nsCOMPtr<nsIDocument> document = content->GetUncomposedDoc();
if (document) {
document->FlushPendingNotifications(FlushType::Display);
return document->GetShell();
}
return nullptr;
}
nsresult
nsBaseDragService::DrawDrag(nsIDOMNode* aDOMNode,
nsIScriptableRegion* aRegion,
CSSIntPoint aScreenPosition,
LayoutDeviceIntRect* aScreenDragRect,
RefPtr<SourceSurface>* aSurface,
nsPresContext** aPresContext)
{
*aSurface = nullptr;
*aPresContext = nullptr;
// use a default size, in case of an error.
aScreenDragRect->MoveTo(aScreenPosition.x - mImageOffset.x,
aScreenPosition.y - mImageOffset.y);
aScreenDragRect->SizeTo(1, 1);
// if a drag image was specified, use that, otherwise, use the source node
nsCOMPtr<nsIDOMNode> dragNode = mImage ? mImage.get() : aDOMNode;
// get the presshell for the node being dragged. If the drag image is not in
// a document or has no frame, get the presshell from the source drag node
nsIPresShell* presShell = GetPresShellForContent(dragNode);
if (!presShell && mImage)
presShell = GetPresShellForContent(aDOMNode);
if (!presShell)
return NS_ERROR_FAILURE;
*aPresContext = presShell->GetPresContext();
nsCOMPtr<nsIFrameLoaderOwner> flo = do_QueryInterface(dragNode);
if (flo) {
RefPtr<nsFrameLoader> fl = flo->GetFrameLoader();
if (fl) {
auto* tp = static_cast<mozilla::dom::TabParent*>(fl->GetRemoteBrowser());
if (tp && tp->TakeDragVisualization(*aSurface, aScreenDragRect)) {
if (mImage) {
// Just clear the surface if chrome has overridden it with an image.
*aSurface = nullptr;
}
return NS_OK;
}
}
}
// convert mouse position to dev pixels of the prescontext
CSSIntPoint screenPosition(aScreenPosition);
screenPosition.x -= mImageOffset.x;
screenPosition.y -= mImageOffset.y;
LayoutDeviceIntPoint screenPoint = ConvertToUnscaledDevPixels(*aPresContext, screenPosition);
aScreenDragRect->x = screenPoint.x;
aScreenDragRect->y = screenPoint.y;
// check if drag images are disabled
bool enableDragImages = Preferences::GetBool(DRAGIMAGES_PREF, true);
// didn't want an image, so just set the screen rectangle to the frame size
if (!enableDragImages || !mHasImage) {
// if a region was specified, set the screen rectangle to the area that
// the region occupies
CSSIntRect dragRect;
if (aRegion) {
// the region's coordinates are relative to the root frame
aRegion->GetBoundingBox(&dragRect.x, &dragRect.y, &dragRect.width, &dragRect.height);
nsIFrame* rootFrame = presShell->GetRootFrame();
CSSIntRect screenRect = rootFrame->GetScreenRect();
dragRect.MoveBy(screenRect.TopLeft());
}
else {
// otherwise, there was no region so just set the rectangle to
// the size of the primary frame of the content.
nsCOMPtr<nsIContent> content = do_QueryInterface(dragNode);
nsIFrame* frame = content->GetPrimaryFrame();
if (frame) {
dragRect = frame->GetScreenRect();
}
}
nsIntRect dragRectDev =
ToAppUnits(dragRect, nsPresContext::AppUnitsPerCSSPixel()).
ToOutsidePixels((*aPresContext)->AppUnitsPerDevPixel());
aScreenDragRect->SizeTo(dragRectDev.width, dragRectDev.height);
return NS_OK;
}
// draw the image for selections
if (mSelection) {
LayoutDeviceIntPoint pnt(aScreenDragRect->TopLeft());
*aSurface = presShell->RenderSelection(mSelection, pnt, aScreenDragRect,
mImage ? 0 : nsIPresShell::RENDER_AUTO_SCALE);
return NS_OK;
}
// if a custom image was specified, check if it is an image node and draw
// using the source rather than the displayed image. But if mImage isn't
// an image or canvas, fall through to RenderNode below.
if (mImage) {
nsCOMPtr<nsIContent> content = do_QueryInterface(dragNode);
HTMLCanvasElement *canvas = HTMLCanvasElement::FromContentOrNull(content);
if (canvas) {
return DrawDragForImage(*aPresContext, nullptr, canvas, aScreenDragRect, aSurface);
}
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(dragNode);
// for image nodes, create the drag image from the actual image data
if (imageLoader) {
return DrawDragForImage(*aPresContext, imageLoader, nullptr, aScreenDragRect, aSurface);
}
// If the image is a popup, use that as the image. This allows custom drag
// images that can change during the drag, but means that any platform
// default image handling won't occur.
// XXXndeakin this should be chrome-only
nsIFrame* frame = content->GetPrimaryFrame();
if (frame && frame->IsMenuPopupFrame()) {
mDragPopup = content;
}
}
if (!mDragPopup) {
// otherwise, just draw the node
nsIntRegion clipRegion;
uint32_t renderFlags = mImage ? 0 : nsIPresShell::RENDER_AUTO_SCALE;
if (aRegion) {
aRegion->GetRegion(&clipRegion);
}
if (renderFlags) {
nsCOMPtr<nsIDOMNode> child;
nsCOMPtr<nsIDOMNodeList> childList;
uint32_t length;
uint32_t count = 0;
nsAutoString childNodeName;
if (NS_SUCCEEDED(dragNode->GetChildNodes(getter_AddRefs(childList))) &&
NS_SUCCEEDED(childList->GetLength(&length))) {
// check every childnode for being a img-tag
while (count < length) {
if (NS_FAILED(childList->Item(count, getter_AddRefs(child))) ||
NS_FAILED(child->GetNodeName(childNodeName))) {
break;
}
// here the node is checked for being a img-tag
if (childNodeName.LowerCaseEqualsLiteral("img")) {
// if the dragnnode contains a image, set RENDER_IS_IMAGE flag
renderFlags = renderFlags | nsIPresShell::RENDER_IS_IMAGE;
break;
}
count++;
}
}
}
LayoutDeviceIntPoint pnt(aScreenDragRect->TopLeft());
*aSurface = presShell->RenderNode(dragNode, aRegion ? &clipRegion : nullptr,
pnt, aScreenDragRect,
renderFlags);
}
// If an image was specified, reset the position from the offset that was supplied.
if (mImage) {
aScreenDragRect->x = screenPoint.x;
aScreenDragRect->y = screenPoint.y;
}
return NS_OK;
}
nsresult
nsBaseDragService::DrawDragForImage(nsPresContext* aPresContext,
nsIImageLoadingContent* aImageLoader,
HTMLCanvasElement* aCanvas,
LayoutDeviceIntRect* aScreenDragRect,
RefPtr<SourceSurface>* aSurface)
{
nsCOMPtr<imgIContainer> imgContainer;
if (aImageLoader) {
nsCOMPtr<imgIRequest> imgRequest;
nsresult rv = aImageLoader->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
getter_AddRefs(imgRequest));
NS_ENSURE_SUCCESS(rv, rv);
if (!imgRequest)
return NS_ERROR_NOT_AVAILABLE;
rv = imgRequest->GetImage(getter_AddRefs(imgContainer));
NS_ENSURE_SUCCESS(rv, rv);
if (!imgContainer)
return NS_ERROR_NOT_AVAILABLE;
// use the size of the image as the size of the drag image
int32_t imageWidth, imageHeight;
rv = imgContainer->GetWidth(&imageWidth);
NS_ENSURE_SUCCESS(rv, rv);
rv = imgContainer->GetHeight(&imageHeight);
NS_ENSURE_SUCCESS(rv, rv);
aScreenDragRect->width = aPresContext->CSSPixelsToDevPixels(imageWidth);
aScreenDragRect->height = aPresContext->CSSPixelsToDevPixels(imageHeight);
}
else {
// XXX The canvas size should be converted to dev pixels.
NS_ASSERTION(aCanvas, "both image and canvas are null");
nsIntSize sz = aCanvas->GetSize();
aScreenDragRect->width = sz.width;
aScreenDragRect->height = sz.height;
}
nsIntSize destSize;
destSize.width = aScreenDragRect->width;
destSize.height = aScreenDragRect->height;
if (destSize.width == 0 || destSize.height == 0)
return NS_ERROR_FAILURE;
nsresult result = NS_OK;
if (aImageLoader) {
RefPtr<DrawTarget> dt =
gfxPlatform::GetPlatform()->
CreateOffscreenContentDrawTarget(destSize,
SurfaceFormat::B8G8R8A8);
if (!dt || !dt->IsValid())
return NS_ERROR_FAILURE;
RefPtr<gfxContext> ctx = gfxContext::CreateOrNull(dt);
if (!ctx)
return NS_ERROR_FAILURE;
DrawResult res =
imgContainer->Draw(ctx, destSize, ImageRegion::Create(destSize),
imgIContainer::FRAME_CURRENT,
SamplingFilter::GOOD, /* no SVGImageContext */ Nothing(),
imgIContainer::FLAG_SYNC_DECODE, 1.0);
if (res == DrawResult::BAD_IMAGE || res == DrawResult::BAD_ARGS) {
return NS_ERROR_FAILURE;
}
*aSurface = dt->Snapshot();
} else {
*aSurface = aCanvas->GetSurfaceSnapshot();
}
return result;
}
LayoutDeviceIntPoint
nsBaseDragService::ConvertToUnscaledDevPixels(nsPresContext* aPresContext,
CSSIntPoint aScreenPosition)
{
int32_t adj = aPresContext->DeviceContext()->AppUnitsPerDevPixelAtUnitFullZoom();
return LayoutDeviceIntPoint(nsPresContext::CSSPixelsToAppUnits(aScreenPosition.x) / adj,
nsPresContext::CSSPixelsToAppUnits(aScreenPosition.y) / adj);
}
NS_IMETHODIMP
nsBaseDragService::Suppress()
{
EndDragSession(false, 0);
++mSuppressLevel;
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragService::Unsuppress()
{
--mSuppressLevel;
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragService::UserCancelled()
{
mUserCancelled = true;
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragService::UpdateDragEffect()
{
mDragActionFromChildProcess = mDragAction;
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragService::UpdateDragImage(nsIDOMNode* aImage, int32_t aImageX, int32_t aImageY)
{
// Don't change the image if this is a drag from another source or if there
// is a drag popup.
if (!mSourceNode || mDragPopup)
return NS_OK;
mImage = aImage;
mImageOffset = CSSIntPoint(aImageX, aImageY);
return NS_OK;
}
NS_IMETHODIMP
nsBaseDragService::DragEventDispatchedToChildProcess()
{
mDragEventDispatchedToChildProcess = true;
return NS_OK;
}
bool
nsBaseDragService::MaybeAddChildProcess(mozilla::dom::ContentParent* aChild)
{
if (!mChildProcesses.Contains(aChild)) {
mChildProcesses.AppendElement(aChild);
return true;
}
return false;
}