summaryrefslogtreecommitdiffstats
path: root/editor/composer/nsEditingSession.cpp
blob: 6d09c3ba9d06c95e395b2662bd4b21db0912368a (plain)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et tw=78: */
/* 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 <string.h>  // for nullptr, strcmp

#include "imgIContainer.h"                    // for imgIContainer, etc
#include "mozilla/ComposerCommandsUpdater.h"  // for ComposerCommandsUpdater
#include "mozilla/FlushType.h"                // for FlushType::Frames
#include "mozilla/HTMLEditor.h"               // for HTMLEditor
#include "mozilla/mozalloc.h"                 // for operator new
#include "mozilla/PresShell.h"                // for PresShell
#include "mozilla/Try.h"                      // for MOZ_TRY
#include "nsAString.h"
#include "nsBaseCommandController.h"  // for nsBaseCommandController
#include "nsCommandManager.h"         // for nsCommandManager
#include "nsComponentManagerUtils.h"  // for do_CreateInstance
#include "nsContentUtils.h"
#include "nsDebug.h"     // for NS_ENSURE_SUCCESS, etc
#include "nsDocShell.h"  // for nsDocShell
#include "nsEditingSession.h"
#include "nsError.h"                      // for NS_ERROR_FAILURE, NS_OK, etc
#include "nsIChannel.h"                   // for nsIChannel
#include "nsIDocumentViewer.h"            // for nsIDocumentViewer
#include "nsIControllers.h"               // for nsIControllers
#include "nsID.h"                         // for NS_GET_IID, etc
#include "nsHTMLDocument.h"               // for nsHTMLDocument
#include "nsIDocShell.h"                  // for nsIDocShell
#include "mozilla/dom/Document.h"         // for Document
#include "nsIEditor.h"                    // for nsIEditor
#include "nsIInterfaceRequestorUtils.h"   // for do_GetInterface
#include "nsIRefreshURI.h"                // for nsIRefreshURI
#include "nsIRequest.h"                   // for nsIRequest
#include "nsITimer.h"                     // for nsITimer, etc
#include "nsIWeakReference.h"             // for nsISupportsWeakReference, etc
#include "nsIWebNavigation.h"             // for nsIWebNavigation
#include "nsIWebProgress.h"               // for nsIWebProgress, etc
#include "nsLiteralString.h"              // for NS_LITERAL_STRING
#include "nsPIDOMWindow.h"                // for nsPIDOMWindow
#include "nsPresContext.h"                // for nsPresContext
#include "nsReadableUtils.h"              // for AppendUTF16toUTF8
#include "nsStringFwd.h"                  // for nsString
#include "mozilla/dom/BrowsingContext.h"  // for BrowsingContext
#include "mozilla/dom/Selection.h"        // for AutoHideSelectionChanges, etc
#include "mozilla/dom/WindowContext.h"    // for WindowContext
#include "nsFrameSelection.h"             // for nsFrameSelection
#include "nsBaseCommandController.h"      // for nsBaseCommandController
#include "mozilla/dom/LoadURIOptionsBinding.h"

class nsISupports;
class nsIURI;

using namespace mozilla;
using namespace mozilla::dom;

/*---------------------------------------------------------------------------

  nsEditingSession

----------------------------------------------------------------------------*/
nsEditingSession::nsEditingSession()
    : mDoneSetup(false),
      mCanCreateEditor(false),
      mInteractive(false),
      mMakeWholeDocumentEditable(true),
      mDisabledJS(false),
      mScriptsEnabled(true),
      mProgressListenerRegistered(false),
      mImageAnimationMode(0),
      mEditorFlags(0),
      mEditorStatus(eEditorOK),
      mBaseCommandControllerId(0),
      mDocStateControllerId(0),
      mHTMLCommandControllerId(0) {}

/*---------------------------------------------------------------------------

  ~nsEditingSession

----------------------------------------------------------------------------*/
nsEditingSession::~nsEditingSession() {
  // Must cancel previous timer?
  if (mLoadBlankDocTimer) mLoadBlankDocTimer->Cancel();
}

NS_IMPL_ISUPPORTS(nsEditingSession, nsIEditingSession, nsIWebProgressListener,
                  nsISupportsWeakReference)

/*---------------------------------------------------------------------------

  MakeWindowEditable

  aEditorType string, "html" "htmlsimple" "text" "textsimple"
  void makeWindowEditable(in nsIDOMWindow aWindow, in string aEditorType,
                          in boolean aDoAfterUriLoad,
                          in boolean aMakeWholeDocumentEditable,
                          in boolean aInteractive);
----------------------------------------------------------------------------*/
#define DEFAULT_EDITOR_TYPE "html"

NS_IMETHODIMP
nsEditingSession::MakeWindowEditable(mozIDOMWindowProxy* aWindow,
                                     const char* aEditorType,
                                     bool aDoAfterUriLoad,
                                     bool aMakeWholeDocumentEditable,
                                     bool aInteractive) {
  mEditorType.Truncate();
  mEditorFlags = 0;

  NS_ENSURE_TRUE(aWindow, NS_ERROR_FAILURE);
  auto* window = nsPIDOMWindowOuter::From(aWindow);

  // disable plugins
  nsCOMPtr<nsIDocShell> docShell = window->GetDocShell();
  NS_ENSURE_TRUE(docShell, NS_ERROR_FAILURE);
  mDocShell = do_GetWeakReference(docShell);

  mInteractive = aInteractive;
  mMakeWholeDocumentEditable = aMakeWholeDocumentEditable;

  nsresult rv;
  if (!mInteractive) {
    rv = DisableJS(window->GetCurrentInnerWindow());
    NS_ENSURE_SUCCESS(rv, rv);
  }

  // Always remove existing editor
  TearDownEditorOnWindow(aWindow);

  // Tells embedder that startup is in progress
  mEditorStatus = eEditorCreationInProgress;

  // temporary to set editor type here. we will need different classes soon.
  if (!aEditorType) aEditorType = DEFAULT_EDITOR_TYPE;
  mEditorType = aEditorType;

  // if all this does is setup listeners and I don't need listeners,
  // can't this step be ignored?? (based on aDoAfterURILoad)
  rv = PrepareForEditing(window);
  NS_ENSURE_SUCCESS(rv, rv);

  // set the flag on the docShell to say that it's editable
  rv = docShell->MakeEditable(aDoAfterUriLoad);
  NS_ENSURE_SUCCESS(rv, rv);

  // Setup commands common to plaintext and html editors,
  //  including the document creation observers
  // the first is an editing controller
  rv = SetupEditorCommandController(
      nsBaseCommandController::CreateEditingController, aWindow,
      static_cast<nsIEditingSession*>(this), &mBaseCommandControllerId);
  NS_ENSURE_SUCCESS(rv, rv);

  // The second is a controller to monitor doc state,
  // such as creation and "dirty flag"
  rv = SetupEditorCommandController(
      nsBaseCommandController::CreateHTMLEditorDocStateController, aWindow,
      static_cast<nsIEditingSession*>(this), &mDocStateControllerId);
  NS_ENSURE_SUCCESS(rv, rv);

  // aDoAfterUriLoad can be false only when making an existing window editable
  if (!aDoAfterUriLoad) {
    rv = SetupEditorOnWindow(MOZ_KnownLive(*window));

    // mEditorStatus is set to the error reason
    // Since this is used only when editing an existing page,
    //  it IS ok to destroy current editor
    if (NS_FAILED(rv)) {
      TearDownEditorOnWindow(aWindow);
    }
  }
  return rv;
}

nsresult nsEditingSession::DisableJS(nsPIDOMWindowInner* aWindow) {
  WindowContext* wc = aWindow->GetWindowContext();

  mScriptsEnabled = wc->GetAllowJavascript();
  MOZ_TRY(wc->SetAllowJavascript(false));
  mDisabledJS = true;
  return NS_OK;
}

nsresult nsEditingSession::RestoreJS(nsPIDOMWindowInner* aWindow) {
  if (!mDisabledJS) {
    return NS_OK;
  }

  mDisabledJS = false;

  if (NS_WARN_IF(!aWindow)) {
    // DetachFromWindow may call this method with nullptr.
    return NS_ERROR_FAILURE;
  }

  WindowContext* wc = aWindow->GetWindowContext();
  return wc->SetAllowJavascript(mScriptsEnabled);
}

/*---------------------------------------------------------------------------

  WindowIsEditable

  boolean windowIsEditable (in nsIDOMWindow aWindow);
----------------------------------------------------------------------------*/
NS_IMETHODIMP
nsEditingSession::WindowIsEditable(mozIDOMWindowProxy* aWindow,
                                   bool* outIsEditable) {
  NS_ENSURE_STATE(aWindow);
  nsCOMPtr<nsIDocShell> docShell =
      nsPIDOMWindowOuter::From(aWindow)->GetDocShell();
  NS_ENSURE_STATE(docShell);

  return docShell->GetEditable(outIsEditable);
}

bool IsSupportedTextType(const nsAString& aMIMEType) {
  // These are MIME types that are automatically parsed as "text/plain"
  //   and thus we can edit them as plaintext
  // Note: in older versions, we attempted to convert the mimetype of
  //   the network channel for these and "text/xml" to "text/plain",
  //   but further investigation reveals that strategy doesn't work
  static constexpr nsLiteralString sSupportedTextTypes[] = {
      u"text/plain"_ns,
      u"text/css"_ns,
      u"text/rdf"_ns,
      u"text/xsl"_ns,
      u"text/javascript"_ns,  // obsolete type
      u"text/ecmascript"_ns,  // obsolete type
      u"application/javascript"_ns,
      u"application/ecmascript"_ns,
      u"application/x-javascript"_ns,  // obsolete type
      u"text/xul"_ns                   // obsolete type
  };

  for (const nsLiteralString& supportedTextType : sSupportedTextTypes) {
    if (aMIMEType.Equals(supportedTextType)) {
      return true;
    }
  }

  return false;
}

nsresult nsEditingSession::SetupEditorOnWindow(nsPIDOMWindowOuter& aWindow) {
  mDoneSetup = true;

  // MIME CHECKING
  // must get the content type
  // Note: the doc gets this from the network channel during StartPageLoad,
  //    so we don't have to get it from there ourselves
  nsAutoString mimeType;

  // then lets check the mime type
  if (RefPtr<Document> doc = aWindow.GetDoc()) {
    doc->GetContentType(mimeType);

    if (IsSupportedTextType(mimeType)) {
      mEditorType.AssignLiteral("text");
      mimeType.AssignLiteral("text/plain");
    } else if (!doc->IsHTMLOrXHTML()) {
      // Neither an acceptable text or html type.
      mEditorStatus = eEditorErrorCantEditMimeType;

      // Turn editor into HTML -- we will load blank page later
      mEditorType.AssignLiteral("html");
      mimeType.AssignLiteral("text/html");
    }

    // Flush out frame construction to make sure that the subframe's
    // presshell is set up if it needs to be.
    doc->FlushPendingNotifications(mozilla::FlushType::Frames);
    if (mMakeWholeDocumentEditable) {
      doc->SetEditableFlag(true);
      // Enable usage of the execCommand API
      doc->SetEditingState(Document::EditingState::eDesignMode);
    }
  }
  bool needHTMLController = false;

  if (mEditorType.EqualsLiteral("textmail")) {
    mEditorFlags = nsIEditor::eEditorPlaintextMask |
                   nsIEditor::eEditorEnableWrapHackMask |
                   nsIEditor::eEditorMailMask;
  } else if (mEditorType.EqualsLiteral("text")) {
    mEditorFlags =
        nsIEditor::eEditorPlaintextMask | nsIEditor::eEditorEnableWrapHackMask;
  } else if (mEditorType.EqualsLiteral("htmlmail")) {
    if (mimeType.EqualsLiteral("text/html")) {
      needHTMLController = true;
      mEditorFlags = nsIEditor::eEditorMailMask;
    } else {
      // Set the flags back to textplain.
      mEditorFlags = nsIEditor::eEditorPlaintextMask |
                     nsIEditor::eEditorEnableWrapHackMask;
    }
  } else {
    // Defaulted to html
    needHTMLController = true;
  }

  if (mInteractive) {
    mEditorFlags |= nsIEditor::eEditorAllowInteraction;
  }

  // make the UI state maintainer
  RefPtr<ComposerCommandsUpdater> commandsUpdater =
      new ComposerCommandsUpdater();
  mComposerCommandsUpdater = commandsUpdater;

  // now init the state maintainer
  // This allows notification of error state
  //  even if we don't create an editor
  commandsUpdater->Init(aWindow);

  if (mEditorStatus != eEditorCreationInProgress) {
    commandsUpdater->OnHTMLEditorCreated();

    // At this point we have made a final decision that we don't support
    // editing the current document.  This is an internal failure state, but
    // we return NS_OK to avoid throwing an exception from the designMode
    // setter for web compatibility.  The document editing APIs will tell the
    // developer if editing has been disabled because we're in a document type
    // that doesn't support editing.
    return NS_OK;
  }

  // Create editor and do other things
  //  only if we haven't found some error above,
  const RefPtr<nsDocShell> docShell = nsDocShell::Cast(aWindow.GetDocShell());
  if (NS_WARN_IF(!docShell)) {
    return NS_ERROR_FAILURE;
  }
  const RefPtr<PresShell> presShell = docShell->GetPresShell();
  if (NS_WARN_IF(!presShell)) {
    return NS_ERROR_FAILURE;
  }

  if (!mInteractive) {
    // Disable animation of images in this document:
    nsPresContext* presContext = presShell->GetPresContext();
    NS_ENSURE_TRUE(presContext, NS_ERROR_FAILURE);

    mImageAnimationMode = presContext->ImageAnimationMode();
    presContext->SetImageAnimationMode(imgIContainer::kDontAnimMode);
  }

  // Hide selection changes during initialization, in order to hide this
  // from web pages.
  RefPtr<nsFrameSelection> fs = presShell->FrameSelection();
  NS_ENSURE_TRUE(fs, NS_ERROR_FAILURE);
  AutoHideSelectionChanges hideSelectionChanges(fs);

  nsCOMPtr<nsIDocumentViewer> viewer;
  nsresult rv = docShell->GetDocViewer(getter_AddRefs(viewer));
  if (NS_FAILED(rv) || NS_WARN_IF(!viewer)) {
    NS_WARNING("nsDocShell::GetDocViewer() failed");
    return rv;
  }

  const RefPtr<Document> doc = viewer->GetDocument();
  if (NS_WARN_IF(!doc)) {
    return NS_ERROR_FAILURE;
  }

  // create and set editor
  // Try to reuse an existing editor
  nsCOMPtr<nsIEditor> editor = do_QueryReferent(mExistingEditor);
  RefPtr<HTMLEditor> htmlEditor = HTMLEditor::GetFrom(editor);
  MOZ_ASSERT_IF(editor, htmlEditor);
  if (htmlEditor) {
    htmlEditor->PreDestroy();
  } else {
    htmlEditor = new HTMLEditor(*doc);
    mExistingEditor =
        do_GetWeakReference(static_cast<nsIEditor*>(htmlEditor.get()));
  }
  // set the editor on the docShell. The docShell now owns it.
  rv = docShell->SetHTMLEditor(htmlEditor);
  NS_ENSURE_SUCCESS(rv, rv);

  // setup the HTML editor command controller
  if (needHTMLController) {
    // The third controller takes an nsIEditor as the context
    rv = SetupEditorCommandController(
        nsBaseCommandController::CreateHTMLEditorController, &aWindow,
        static_cast<nsIEditor*>(htmlEditor), &mHTMLCommandControllerId);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  // Set mimetype on editor
  rv = htmlEditor->SetContentsMIMEType(mimeType);
  NS_ENSURE_SUCCESS(rv, rv);

  MOZ_ASSERT(docShell->HasDocumentViewer());
  MOZ_ASSERT(viewer->GetDocument());

  MOZ_DIAGNOSTIC_ASSERT(commandsUpdater == mComposerCommandsUpdater);
  if (MOZ_UNLIKELY(commandsUpdater != mComposerCommandsUpdater)) {
    commandsUpdater = mComposerCommandsUpdater;
  }
  rv = htmlEditor->Init(*doc, *commandsUpdater, mEditorFlags);
  NS_ENSURE_SUCCESS(rv, rv);

  RefPtr<Selection> selection = htmlEditor->GetSelection();
  if (NS_WARN_IF(!selection)) {
    return NS_ERROR_FAILURE;
  }

  // Set context on all controllers to be the editor
  rv = SetEditorOnControllers(aWindow, htmlEditor);
  NS_ENSURE_SUCCESS(rv, rv);

  // Everything went fine!
  mEditorStatus = eEditorOK;

  // This will trigger documentCreation notification
  return htmlEditor->PostCreate();
}

// Removes all listeners and controllers from aWindow and aEditor.
void nsEditingSession::RemoveListenersAndControllers(
    nsPIDOMWindowOuter* aWindow, HTMLEditor* aHTMLEditor) {
  if (!mComposerCommandsUpdater || !aHTMLEditor) {
    return;
  }

  // Remove all the listeners
  RefPtr<ComposerCommandsUpdater> composertCommandsUpdater =
      std::move(mComposerCommandsUpdater);
  MOZ_ASSERT(!mComposerCommandsUpdater);
  aHTMLEditor->Detach(*composertCommandsUpdater);

  // Remove editor controllers from the window now that we're not
  // editing in that window any more.
  RemoveEditorControllers(aWindow);
}

/*---------------------------------------------------------------------------

  TearDownEditorOnWindow

  void tearDownEditorOnWindow (in nsIDOMWindow aWindow);
----------------------------------------------------------------------------*/
NS_IMETHODIMP
nsEditingSession::TearDownEditorOnWindow(mozIDOMWindowProxy* aWindow) {
  if (!mDoneSetup) {
    return NS_OK;
  }

  NS_ENSURE_TRUE(aWindow, NS_ERROR_NULL_POINTER);

  // Kill any existing reload timer
  if (mLoadBlankDocTimer) {
    mLoadBlankDocTimer->Cancel();
    mLoadBlankDocTimer = nullptr;
  }

  mDoneSetup = false;

  // Check if we're turning off editing (from contentEditable or designMode).
  auto* window = nsPIDOMWindowOuter::From(aWindow);

  RefPtr<Document> doc = window->GetDoc();
  bool stopEditing = doc && doc->IsEditingOn();
  if (stopEditing) {
    RemoveWebProgressListener(window);
  }

  nsCOMPtr<nsIDocShell> docShell = window->GetDocShell();
  NS_ENSURE_STATE(docShell);

  RefPtr<HTMLEditor> htmlEditor = docShell->GetHTMLEditor();
  if (stopEditing) {
    doc->TearingDownEditor();
  }

  if (mComposerCommandsUpdater && htmlEditor) {
    // Null out the editor on the controllers first to prevent their weak
    // references from pointing to a destroyed editor.
    SetEditorOnControllers(*window, nullptr);
  }

  // Null out the editor on the docShell to trigger PreDestroy which
  // needs to happen before document state listeners are removed below.
  docShell->SetEditor(nullptr);

  RemoveListenersAndControllers(window, htmlEditor);

  if (stopEditing) {
    // Make things the way they were before we started editing.
    RestoreJS(window->GetCurrentInnerWindow());
    RestoreAnimationMode(window);

    if (mMakeWholeDocumentEditable) {
      doc->SetEditableFlag(false);
      doc->SetEditingState(Document::EditingState::eOff);
    }
  }

  return NS_OK;
}

/*---------------------------------------------------------------------------

  GetEditorForFrame

  nsIEditor getEditorForFrame (in nsIDOMWindow aWindow);
----------------------------------------------------------------------------*/
NS_IMETHODIMP
nsEditingSession::GetEditorForWindow(mozIDOMWindowProxy* aWindow,
                                     nsIEditor** outEditor) {
  if (NS_WARN_IF(!aWindow)) {
    return NS_ERROR_INVALID_ARG;
  }
  nsCOMPtr<nsIEditor> editor = GetHTMLEditorForWindow(aWindow);
  editor.forget(outEditor);
  return NS_OK;
}

/*---------------------------------------------------------------------------

  OnStateChange

----------------------------------------------------------------------------*/
NS_IMETHODIMP
nsEditingSession::OnStateChange(nsIWebProgress* aWebProgress,
                                nsIRequest* aRequest, uint32_t aStateFlags,
                                nsresult aStatus) {
#ifdef NOISY_DOC_LOADING
  nsCOMPtr<nsIChannel> channel(do_QueryInterface(aRequest));
  if (channel) {
    nsAutoCString contentType;
    channel->GetContentType(contentType);
    if (!contentType.IsEmpty()) {
      printf(" ++++++ MIMETYPE = %s\n", contentType.get());
    }
  }
#endif

  //
  // A Request has started...
  //
  if (aStateFlags & nsIWebProgressListener::STATE_START) {
#ifdef NOISY_DOC_LOADING
    {
      nsCOMPtr<nsIChannel> channel(do_QueryInterface(aRequest));
      if (channel) {
        nsCOMPtr<nsIURI> uri;
        channel->GetURI(getter_AddRefs(uri));
        if (uri) {
          nsCString spec;
          uri->GetSpec(spec);
          printf(" **** STATE_START: CHANNEL URI=%s, flags=%x\n", spec.get(),
                 aStateFlags);
        }
      } else {
        printf("    STATE_START: NO CHANNEL flags=%x\n", aStateFlags);
      }
    }
#endif
    // Page level notification...
    if (aStateFlags & nsIWebProgressListener::STATE_IS_NETWORK) {
      nsCOMPtr<nsIChannel> channel(do_QueryInterface(aRequest));
      StartPageLoad(channel);
#ifdef NOISY_DOC_LOADING
      printf("STATE_START & STATE_IS_NETWORK flags=%x\n", aStateFlags);
#endif
    }

    // Document level notification...
    if (aStateFlags & nsIWebProgressListener::STATE_IS_DOCUMENT &&
        !(aStateFlags & nsIWebProgressListener::STATE_RESTORING)) {
#ifdef NOISY_DOC_LOADING
      printf("STATE_START & STATE_IS_DOCUMENT flags=%x\n", aStateFlags);
#endif

      bool progressIsForTargetDocument =
          IsProgressForTargetDocument(aWebProgress);

      if (progressIsForTargetDocument) {
        nsCOMPtr<mozIDOMWindowProxy> window;
        aWebProgress->GetDOMWindow(getter_AddRefs(window));

        auto* piWindow = nsPIDOMWindowOuter::From(window);
        RefPtr<Document> doc = piWindow->GetDoc();
        nsHTMLDocument* htmlDoc =
            doc && doc->IsHTMLOrXHTML() ? doc->AsHTMLDocument() : nullptr;
        if (htmlDoc && doc->IsWriting()) {
          nsAutoString designMode;
          htmlDoc->GetDesignMode(designMode);

          if (designMode.EqualsLiteral("on")) {
            // This notification is for data coming in through
            // document.open/write/close(), ignore it.

            return NS_OK;
          }
        }

        mCanCreateEditor = true;
        StartDocumentLoad(aWebProgress, progressIsForTargetDocument);
      }
    }
  }
  //
  // A Request is being processed
  //
  else if (aStateFlags & nsIWebProgressListener::STATE_TRANSFERRING) {
    if (aStateFlags & nsIWebProgressListener::STATE_IS_DOCUMENT) {
      // document transfer started
    }
  }
  //
  // Got a redirection
  //
  else if (aStateFlags & nsIWebProgressListener::STATE_REDIRECTING) {
    if (aStateFlags & nsIWebProgressListener::STATE_IS_DOCUMENT) {
      // got a redirect
    }
  }
  //
  // A network or document Request has finished...
  //
  else if (aStateFlags & nsIWebProgressListener::STATE_STOP) {
#ifdef NOISY_DOC_LOADING
    {
      nsCOMPtr<nsIChannel> channel(do_QueryInterface(aRequest));
      if (channel) {
        nsCOMPtr<nsIURI> uri;
        channel->GetURI(getter_AddRefs(uri));
        if (uri) {
          nsCString spec;
          uri->GetSpec(spec);
          printf(" **** STATE_STOP: CHANNEL URI=%s, flags=%x\n", spec.get(),
                 aStateFlags);
        }
      } else {
        printf("     STATE_STOP: NO CHANNEL  flags=%x\n", aStateFlags);
      }
    }
#endif

    // Document level notification...
    if (aStateFlags & nsIWebProgressListener::STATE_IS_DOCUMENT) {
      nsCOMPtr<nsIChannel> channel = do_QueryInterface(aRequest);
      EndDocumentLoad(aWebProgress, channel, aStatus,
                      IsProgressForTargetDocument(aWebProgress));
#ifdef NOISY_DOC_LOADING
      printf("STATE_STOP & STATE_IS_DOCUMENT flags=%x\n", aStateFlags);
#endif
    }

    // Page level notification...
    if (aStateFlags & nsIWebProgressListener::STATE_IS_NETWORK) {
      nsCOMPtr<nsIChannel> channel = do_QueryInterface(aRequest);
      (void)EndPageLoad(aWebProgress, channel, aStatus);
#ifdef NOISY_DOC_LOADING
      printf("STATE_STOP & STATE_IS_NETWORK flags=%x\n", aStateFlags);
#endif
    }
  }

  return NS_OK;
}

/*---------------------------------------------------------------------------

  OnProgressChange

----------------------------------------------------------------------------*/
NS_IMETHODIMP
nsEditingSession::OnProgressChange(nsIWebProgress* aWebProgress,
                                   nsIRequest* aRequest,
                                   int32_t aCurSelfProgress,
                                   int32_t aMaxSelfProgress,
                                   int32_t aCurTotalProgress,
                                   int32_t aMaxTotalProgress) {
  MOZ_ASSERT_UNREACHABLE("notification excluded in AddProgressListener(...)");
  return NS_OK;
}

/*---------------------------------------------------------------------------

  OnLocationChange

----------------------------------------------------------------------------*/
NS_IMETHODIMP
nsEditingSession::OnLocationChange(nsIWebProgress* aWebProgress,
                                   nsIRequest* aRequest, nsIURI* aURI,
                                   uint32_t aFlags) {
  nsCOMPtr<mozIDOMWindowProxy> domWindow;
  nsresult rv = aWebProgress->GetDOMWindow(getter_AddRefs(domWindow));
  NS_ENSURE_SUCCESS(rv, rv);

  auto* piWindow = nsPIDOMWindowOuter::From(domWindow);

  RefPtr<Document> doc = piWindow->GetDoc();
  NS_ENSURE_TRUE(doc, NS_ERROR_FAILURE);

  doc->SetDocumentURI(aURI);

  // Notify the location-changed observer that
  //  the document URL has changed
  nsIDocShell* docShell = piWindow->GetDocShell();
  NS_ENSURE_TRUE(docShell, NS_ERROR_FAILURE);

  RefPtr<nsCommandManager> commandManager = docShell->GetCommandManager();
  commandManager->CommandStatusChanged("obs_documentLocationChanged");
  return NS_OK;
}

/*---------------------------------------------------------------------------

  OnStatusChange

----------------------------------------------------------------------------*/
NS_IMETHODIMP
nsEditingSession::OnStatusChange(nsIWebProgress* aWebProgress,
                                 nsIRequest* aRequest, nsresult aStatus,
                                 const char16_t* aMessage) {
  MOZ_ASSERT_UNREACHABLE("notification excluded in AddProgressListener(...)");
  return NS_OK;
}

/*---------------------------------------------------------------------------

  OnSecurityChange

----------------------------------------------------------------------------*/
NS_IMETHODIMP
nsEditingSession::OnSecurityChange(nsIWebProgress* aWebProgress,
                                   nsIRequest* aRequest, uint32_t aState) {
  MOZ_ASSERT_UNREACHABLE("notification excluded in AddProgressListener(...)");
  return NS_OK;
}

/*---------------------------------------------------------------------------

  OnContentBlockingEvent

----------------------------------------------------------------------------*/
NS_IMETHODIMP
nsEditingSession::OnContentBlockingEvent(nsIWebProgress* aWebProgress,
                                         nsIRequest* aRequest,
                                         uint32_t aEvent) {
  MOZ_ASSERT_UNREACHABLE("notification excluded in AddProgressListener(...)");
  return NS_OK;
}

/*---------------------------------------------------------------------------

  IsProgressForTargetDocument

  Check that this notification is for our document.
----------------------------------------------------------------------------*/

bool nsEditingSession::IsProgressForTargetDocument(
    nsIWebProgress* aWebProgress) {
  nsCOMPtr<nsIWebProgress> editedWebProgress = do_QueryReferent(mDocShell);
  return editedWebProgress == aWebProgress;
}

/*---------------------------------------------------------------------------

  GetEditorStatus

  Called during GetCommandStateParams("obs_documentCreated"...)
  to determine if editor was created and document
  was loaded successfully
----------------------------------------------------------------------------*/
NS_IMETHODIMP
nsEditingSession::GetEditorStatus(uint32_t* aStatus) {
  NS_ENSURE_ARG_POINTER(aStatus);
  *aStatus = mEditorStatus;
  return NS_OK;
}

/*---------------------------------------------------------------------------

  StartDocumentLoad

  Called on start of load in a single frame
----------------------------------------------------------------------------*/
nsresult nsEditingSession::StartDocumentLoad(nsIWebProgress* aWebProgress,
                                             bool aIsToBeMadeEditable) {
#ifdef NOISY_DOC_LOADING
  printf("======= StartDocumentLoad ========\n");
#endif

  NS_ENSURE_ARG_POINTER(aWebProgress);

  if (aIsToBeMadeEditable) {
    mEditorStatus = eEditorCreationInProgress;
  }

  return NS_OK;
}

/*---------------------------------------------------------------------------

  EndDocumentLoad

  Called on end of load in a single frame
----------------------------------------------------------------------------*/
nsresult nsEditingSession::EndDocumentLoad(nsIWebProgress* aWebProgress,
                                           nsIChannel* aChannel,
                                           nsresult aStatus,
                                           bool aIsToBeMadeEditable) {
  NS_ENSURE_ARG_POINTER(aWebProgress);

#ifdef NOISY_DOC_LOADING
  printf("======= EndDocumentLoad ========\n");
  printf("with status %d, ", aStatus);
  nsCOMPtr<nsIURI> uri;
  nsCString spec;
  if (NS_SUCCEEDED(aChannel->GetURI(getter_AddRefs(uri)))) {
    uri->GetSpec(spec);
    printf(" uri %s\n", spec.get());
  }
#endif

  // We want to call the base class EndDocumentLoad,
  // but avoid some of the stuff
  // that nsDocShell does (need to refactor).

  // OK, time to make an editor on this document
  nsCOMPtr<mozIDOMWindowProxy> domWindow;
  aWebProgress->GetDOMWindow(getter_AddRefs(domWindow));
  NS_ENSURE_TRUE(domWindow, NS_ERROR_FAILURE);

  // Set the error state -- we will create an editor
  // anyway and load empty doc later
  if (aIsToBeMadeEditable && aStatus == NS_ERROR_FILE_NOT_FOUND) {
    mEditorStatus = eEditorErrorFileNotFound;
  }

  auto* window = nsPIDOMWindowOuter::From(domWindow);
  nsIDocShell* docShell = window->GetDocShell();
  NS_ENSURE_TRUE(docShell, NS_ERROR_FAILURE);  // better error handling?

  // cancel refresh from meta tags
  // we need to make sure that all pages in editor (whether editable or not)
  // can't refresh contents being edited
  nsCOMPtr<nsIRefreshURI> refreshURI = do_QueryInterface(docShell);
  if (refreshURI) {
    refreshURI->CancelRefreshURITimers();
  }

  nsresult rv = NS_OK;

  // did someone set the flag to make this shell editable?
  if (aIsToBeMadeEditable && mCanCreateEditor) {
    bool makeEditable;
    docShell->GetEditable(&makeEditable);

    if (makeEditable) {
      // To keep pre Gecko 1.9 behavior, setup editor always when
      // mMakeWholeDocumentEditable.
      bool needsSetup = false;
      if (mMakeWholeDocumentEditable) {
        needsSetup = true;
      } else {
        // do we already have an editor here?
        needsSetup = !docShell->GetHTMLEditor();
      }

      if (needsSetup) {
        mCanCreateEditor = false;
        rv = SetupEditorOnWindow(MOZ_KnownLive(*window));
        if (NS_FAILED(rv)) {
          // If we had an error, setup timer to load a blank page later
          if (mLoadBlankDocTimer) {
            // Must cancel previous timer?
            mLoadBlankDocTimer->Cancel();
            mLoadBlankDocTimer = nullptr;
          }

          rv = NS_NewTimerWithFuncCallback(getter_AddRefs(mLoadBlankDocTimer),
                                           nsEditingSession::TimerCallback,
                                           static_cast<void*>(mDocShell.get()),
                                           10, nsITimer::TYPE_ONE_SHOT,
                                           "nsEditingSession::EndDocumentLoad");
          NS_ENSURE_SUCCESS(rv, rv);

          mEditorStatus = eEditorCreationInProgress;
        }
      }
    }
  }
  return rv;
}

void nsEditingSession::TimerCallback(nsITimer* aTimer, void* aClosure) {
  nsCOMPtr<nsIDocShell> docShell =
      do_QueryReferent(static_cast<nsIWeakReference*>(aClosure));
  if (docShell) {
    nsCOMPtr<nsIWebNavigation> webNav(do_QueryInterface(docShell));
    if (webNav) {
      LoadURIOptions loadURIOptions;
      loadURIOptions.mTriggeringPrincipal =
          nsContentUtils::GetSystemPrincipal();
      nsCOMPtr<nsIURI> uri;
      MOZ_ALWAYS_SUCCEEDS(NS_NewURI(getter_AddRefs(uri), "about:blank"_ns));
      webNav->LoadURI(uri, loadURIOptions);
    }
  }
}

/*---------------------------------------------------------------------------

  StartPageLoad

  Called on start load of the entire page (incl. subframes)
----------------------------------------------------------------------------*/
nsresult nsEditingSession::StartPageLoad(nsIChannel* aChannel) {
#ifdef NOISY_DOC_LOADING
  printf("======= StartPageLoad ========\n");
#endif
  return NS_OK;
}

/*---------------------------------------------------------------------------

  EndPageLoad

  Called on end load of the entire page (incl. subframes)
----------------------------------------------------------------------------*/
nsresult nsEditingSession::EndPageLoad(nsIWebProgress* aWebProgress,
                                       nsIChannel* aChannel, nsresult aStatus) {
#ifdef NOISY_DOC_LOADING
  printf("======= EndPageLoad ========\n");
  printf("  with status %d, ", aStatus);
  nsCOMPtr<nsIURI> uri;
  nsCString spec;
  if (NS_SUCCEEDED(aChannel->GetURI(getter_AddRefs(uri)))) {
    uri->GetSpec(spec);
    printf("uri %s\n", spec.get());
  }

  nsAutoCString contentType;
  aChannel->GetContentType(contentType);
  if (!contentType.IsEmpty()) {
    printf("   flags = %d, status = %d, MIMETYPE = %s\n", mEditorFlags,
           mEditorStatus, contentType.get());
  }
#endif

  // Set the error state -- we will create an editor anyway
  // and load empty doc later
  if (aStatus == NS_ERROR_FILE_NOT_FOUND) {
    mEditorStatus = eEditorErrorFileNotFound;
  }

  nsCOMPtr<mozIDOMWindowProxy> domWindow;
  aWebProgress->GetDOMWindow(getter_AddRefs(domWindow));

  nsIDocShell* docShell =
      domWindow ? nsPIDOMWindowOuter::From(domWindow)->GetDocShell() : nullptr;
  NS_ENSURE_TRUE(docShell, NS_ERROR_FAILURE);

  // cancel refresh from meta tags
  // we need to make sure that all pages in editor (whether editable or not)
  // can't refresh contents being edited
  nsCOMPtr<nsIRefreshURI> refreshURI = do_QueryInterface(docShell);
  if (refreshURI) {
    refreshURI->CancelRefreshURITimers();
  }

#if 0
  // Shouldn't we do this when we want to edit sub-frames?
  return MakeWindowEditable(domWindow, "html", false, mInteractive);
#else
  return NS_OK;
#endif
}

/*---------------------------------------------------------------------------

  PrepareForEditing

  Set up this editing session for one or more editors
----------------------------------------------------------------------------*/
nsresult nsEditingSession::PrepareForEditing(nsPIDOMWindowOuter* aWindow) {
  if (mProgressListenerRegistered) {
    return NS_OK;
  }

  nsIDocShell* docShell = aWindow ? aWindow->GetDocShell() : nullptr;

  // register callback
  nsCOMPtr<nsIWebProgress> webProgress = do_GetInterface(docShell);
  NS_ENSURE_TRUE(webProgress, NS_ERROR_FAILURE);

  nsresult rv = webProgress->AddProgressListener(
      this, (nsIWebProgress::NOTIFY_STATE_NETWORK |
             nsIWebProgress::NOTIFY_STATE_DOCUMENT |
             nsIWebProgress::NOTIFY_LOCATION));

  mProgressListenerRegistered = NS_SUCCEEDED(rv);

  return rv;
}

/*---------------------------------------------------------------------------

  SetupEditorCommandController

  Create a command controller, append to controllers,
  get and return the controller ID, and set the context
----------------------------------------------------------------------------*/
nsresult nsEditingSession::SetupEditorCommandController(
    nsEditingSession::ControllerCreatorFn aControllerCreatorFn,
    mozIDOMWindowProxy* aWindow, nsISupports* aContext,
    uint32_t* aControllerId) {
  NS_ENSURE_ARG_POINTER(aControllerCreatorFn);
  NS_ENSURE_ARG_POINTER(aWindow);
  NS_ENSURE_ARG_POINTER(aContext);
  NS_ENSURE_ARG_POINTER(aControllerId);

  auto* piWindow = nsPIDOMWindowOuter::From(aWindow);
  MOZ_ASSERT(piWindow);

  nsCOMPtr<nsIControllers> controllers;
  nsresult rv = piWindow->GetControllers(getter_AddRefs(controllers));
  NS_ENSURE_SUCCESS(rv, rv);

  // We only have to create each singleton controller once
  // We know this has happened once we have a controllerId value
  if (!*aControllerId) {
    RefPtr<nsBaseCommandController> commandController = aControllerCreatorFn();
    NS_ENSURE_TRUE(commandController, NS_ERROR_FAILURE);

    // We must insert at head of the list to be sure our
    //   controller is found before other implementations
    //   (e.g., not-implemented versions by browser)
    rv = controllers->InsertControllerAt(0, commandController);
    NS_ENSURE_SUCCESS(rv, rv);

    // Remember the ID for the controller
    rv = controllers->GetControllerId(commandController, aControllerId);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  // Set the context
  return SetContextOnControllerById(controllers, aContext, *aControllerId);
}

nsresult nsEditingSession::SetEditorOnControllers(nsPIDOMWindowOuter& aWindow,
                                                  HTMLEditor* aEditor) {
  nsCOMPtr<nsIControllers> controllers;
  nsresult rv = aWindow.GetControllers(getter_AddRefs(controllers));
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsISupports> editorAsISupports = static_cast<nsIEditor*>(aEditor);
  if (mBaseCommandControllerId) {
    rv = SetContextOnControllerById(controllers, editorAsISupports,
                                    mBaseCommandControllerId);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  if (mDocStateControllerId) {
    rv = SetContextOnControllerById(controllers, editorAsISupports,
                                    mDocStateControllerId);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  if (mHTMLCommandControllerId) {
    rv = SetContextOnControllerById(controllers, editorAsISupports,
                                    mHTMLCommandControllerId);
  }

  return rv;
}

nsresult nsEditingSession::SetContextOnControllerById(
    nsIControllers* aControllers, nsISupports* aContext, uint32_t aID) {
  NS_ENSURE_ARG_POINTER(aControllers);

  // aContext can be null (when destroying editor)
  nsCOMPtr<nsIController> controller;
  aControllers->GetControllerById(aID, getter_AddRefs(controller));

  // ok with nil controller
  nsCOMPtr<nsIControllerContext> editorController =
      do_QueryInterface(controller);
  NS_ENSURE_TRUE(editorController, NS_ERROR_FAILURE);

  return editorController->SetCommandContext(aContext);
}

void nsEditingSession::RemoveEditorControllers(nsPIDOMWindowOuter* aWindow) {
  // Remove editor controllers from the aWindow, call when we're
  // tearing down/detaching editor.

  nsCOMPtr<nsIControllers> controllers;
  if (aWindow) {
    aWindow->GetControllers(getter_AddRefs(controllers));
  }

  if (controllers) {
    nsCOMPtr<nsIController> controller;
    if (mBaseCommandControllerId) {
      controllers->GetControllerById(mBaseCommandControllerId,
                                     getter_AddRefs(controller));
      if (controller) {
        controllers->RemoveController(controller);
      }
    }

    if (mDocStateControllerId) {
      controllers->GetControllerById(mDocStateControllerId,
                                     getter_AddRefs(controller));
      if (controller) {
        controllers->RemoveController(controller);
      }
    }

    if (mHTMLCommandControllerId) {
      controllers->GetControllerById(mHTMLCommandControllerId,
                                     getter_AddRefs(controller));
      if (controller) {
        controllers->RemoveController(controller);
      }
    }
  }

  // Clear IDs to trigger creation of new controllers.
  mBaseCommandControllerId = 0;
  mDocStateControllerId = 0;
  mHTMLCommandControllerId = 0;
}

void nsEditingSession::RemoveWebProgressListener(nsPIDOMWindowOuter* aWindow) {
  nsIDocShell* docShell = aWindow ? aWindow->GetDocShell() : nullptr;
  nsCOMPtr<nsIWebProgress> webProgress = do_GetInterface(docShell);
  if (webProgress) {
    webProgress->RemoveProgressListener(this);
    mProgressListenerRegistered = false;
  }
}

void nsEditingSession::RestoreAnimationMode(nsPIDOMWindowOuter* aWindow) {
  if (mInteractive) {
    return;
  }

  nsCOMPtr<nsIDocShell> docShell = aWindow ? aWindow->GetDocShell() : nullptr;
  NS_ENSURE_TRUE_VOID(docShell);
  RefPtr<PresShell> presShell = docShell->GetPresShell();
  if (NS_WARN_IF(!presShell)) {
    return;
  }
  nsPresContext* presContext = presShell->GetPresContext();
  NS_ENSURE_TRUE_VOID(presContext);

  presContext->SetImageAnimationMode(mImageAnimationMode);
}

nsresult nsEditingSession::DetachFromWindow(nsPIDOMWindowOuter* aWindow) {
  NS_ENSURE_TRUE(mDoneSetup, NS_OK);

  NS_ASSERTION(mComposerCommandsUpdater,
               "mComposerCommandsUpdater should exist.");

  // Kill any existing reload timer
  if (mLoadBlankDocTimer) {
    mLoadBlankDocTimer->Cancel();
    mLoadBlankDocTimer = nullptr;
  }

  // Remove controllers, webprogress listener, and otherwise
  // make things the way they were before we started editing.
  RemoveEditorControllers(aWindow);
  RemoveWebProgressListener(aWindow);
  RestoreJS(aWindow->GetCurrentInnerWindow());
  RestoreAnimationMode(aWindow);

  // Kill our weak reference to our original window, in case
  // it changes on restore, or otherwise dies.
  mDocShell = nullptr;

  return NS_OK;
}

nsresult nsEditingSession::ReattachToWindow(nsPIDOMWindowOuter* aWindow) {
  NS_ENSURE_TRUE(mDoneSetup, NS_OK);
  NS_ENSURE_TRUE(aWindow, NS_ERROR_FAILURE);

  NS_ASSERTION(mComposerCommandsUpdater,
               "mComposerCommandsUpdater should exist.");

  // Imitate nsEditorDocShell::MakeEditable() to reattach the
  // old editor to the window.
  nsresult rv;

  nsIDocShell* docShell = aWindow->GetDocShell();
  NS_ENSURE_TRUE(docShell, NS_ERROR_FAILURE);
  mDocShell = do_GetWeakReference(docShell);

  // Disable JS.
  if (!mInteractive) {
    rv = DisableJS(aWindow->GetCurrentInnerWindow());
    NS_ENSURE_SUCCESS(rv, rv);
  }

  // Tells embedder that startup is in progress.
  mEditorStatus = eEditorCreationInProgress;

  // Adds back web progress listener.
  rv = PrepareForEditing(aWindow);
  NS_ENSURE_SUCCESS(rv, rv);

  // Setup the command controllers again.
  rv = SetupEditorCommandController(
      nsBaseCommandController::CreateEditingController, aWindow,
      static_cast<nsIEditingSession*>(this), &mBaseCommandControllerId);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = SetupEditorCommandController(
      nsBaseCommandController::CreateHTMLEditorDocStateController, aWindow,
      static_cast<nsIEditingSession*>(this), &mDocStateControllerId);
  NS_ENSURE_SUCCESS(rv, rv);

  if (mComposerCommandsUpdater) {
    mComposerCommandsUpdater->Init(*aWindow);
  }

  // Get editor
  RefPtr<HTMLEditor> htmlEditor = GetHTMLEditorForWindow(aWindow);
  if (NS_WARN_IF(!htmlEditor)) {
    return NS_ERROR_FAILURE;
  }

  if (!mInteractive) {
    // Disable animation of images in this document:
    RefPtr<PresShell> presShell = docShell->GetPresShell();
    if (NS_WARN_IF(!presShell)) {
      return NS_ERROR_FAILURE;
    }
    nsPresContext* presContext = presShell->GetPresContext();
    NS_ENSURE_TRUE(presContext, NS_ERROR_FAILURE);

    mImageAnimationMode = presContext->ImageAnimationMode();
    presContext->SetImageAnimationMode(imgIContainer::kDontAnimMode);
  }

  // The third controller takes an nsIEditor as the context
  rv = SetupEditorCommandController(
      nsBaseCommandController::CreateHTMLEditorController, aWindow,
      static_cast<nsIEditor*>(htmlEditor.get()), &mHTMLCommandControllerId);
  NS_ENSURE_SUCCESS(rv, rv);

  // Set context on all controllers to be the editor
  rv = SetEditorOnControllers(*aWindow, htmlEditor);
  NS_ENSURE_SUCCESS(rv, rv);

#ifdef DEBUG
  {
    bool isEditable;
    rv = WindowIsEditable(aWindow, &isEditable);
    NS_ENSURE_SUCCESS(rv, rv);
    NS_ASSERTION(isEditable,
                 "Window is not editable after reattaching editor.");
  }
#endif  // DEBUG

  return NS_OK;
}

HTMLEditor* nsIEditingSession::GetHTMLEditorForWindow(
    mozIDOMWindowProxy* aWindow) {
  if (NS_WARN_IF(!aWindow)) {
    return nullptr;
  }

  nsCOMPtr<nsIDocShell> docShell =
      nsPIDOMWindowOuter::From(aWindow)->GetDocShell();
  if (NS_WARN_IF(!docShell)) {
    return nullptr;
  }

  return docShell->GetHTMLEditor();
}