summaryrefslogtreecommitdiffstats
path: root/devtools/shared/layout/utils.js
blob: 3e690fc5c36c1d9610a938e0333c4cbd9c82e618 (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
/* 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/. */

"use strict";

loader.lazyRequireGetter(
  this,
  "DevToolsUtils",
  "resource://devtools/shared/DevToolsUtils.js"
);
const lazy = {};
ChromeUtils.defineModuleGetter(
  lazy,
  "NetUtil",
  "resource://gre/modules/NetUtil.jsm"
);

const SHEET_TYPE = {
  agent: "AGENT_SHEET",
  user: "USER_SHEET",
  author: "AUTHOR_SHEET",
};

// eslint-disable-next-line no-unused-vars
loader.lazyRequireGetter(
  this,
  "setIgnoreLayoutChanges",
  "resource://devtools/server/actors/reflow.js",
  true
);
exports.setIgnoreLayoutChanges = (...args) =>
  this.setIgnoreLayoutChanges(...args);

/**
 * Returns the `DOMWindowUtils` for the window given.
 *
 * @param {DOMWindow} win
 * @returns {DOMWindowUtils}
 */
const utilsCache = new WeakMap();
function utilsFor(win) {
  // XXXbz Given that we now have a direct getter for the DOMWindowUtils, is
  // this weakmap cache path any faster than just calling the getter?
  if (!utilsCache.has(win)) {
    utilsCache.set(win, win.windowUtils);
  }
  return utilsCache.get(win);
}

/**
 * Check a window is part of the boundary window given.
 *
 * @param {DOMWindow} boundaryWindow
 * @param {DOMWindow} win
 * @return {Boolean}
 */
function isWindowIncluded(boundaryWindow, win) {
  if (win === boundaryWindow) {
    return true;
  }

  const parent = win.parent;

  if (!parent || parent === win) {
    return false;
  }

  return isWindowIncluded(boundaryWindow, parent);
}
exports.isWindowIncluded = isWindowIncluded;

/**
 * like win.frameElement, but goes through mozbrowsers and mozapps iframes.
 *
 * @param {DOMWindow} win
 *        The window to get the frame for
 * @return {DOMNode}
 *         The element in which the window is embedded.
 */
const getFrameElement = win => {
  const isTopWindow = win && DevToolsUtils.getTopWindow(win) === win;
  return isTopWindow ? null : win.browsingContext.embedderElement;
};
exports.getFrameElement = getFrameElement;

/**
 * Get the x/y offsets for of all the parent frames of a given node, limited to
 * the boundary window given.
 *
 * @param {DOMWindow} boundaryWindow
 *        The window where to stop to iterate. If `null` is given, the top
 *        window is used.
 * @param {DOMNode} node
 *        The node for which we are to get the offset
 * @return {Array}
 *         The frame offset [x, y]
 */
function getFrameOffsets(boundaryWindow, node) {
  let xOffset = 0;
  let yOffset = 0;

  let frameWin = getWindowFor(node);
  const scale = getCurrentZoom(node);

  if (boundaryWindow === null) {
    boundaryWindow = DevToolsUtils.getTopWindow(frameWin);
  } else if (typeof boundaryWindow === "undefined") {
    throw new Error("No boundaryWindow given. Use null for the default one.");
  }

  while (frameWin !== boundaryWindow) {
    const frameElement = getFrameElement(frameWin);
    if (!frameElement) {
      break;
    }

    // We are in an iframe.
    // We take into account the parent iframe position and its
    // offset (borders and padding).
    const frameRect = frameElement.getBoundingClientRect();

    const [offsetTop, offsetLeft] = getFrameContentOffset(frameElement);

    xOffset += frameRect.left + offsetLeft;
    yOffset += frameRect.top + offsetTop;

    frameWin = frameWin.parent;
  }

  return [xOffset * scale, yOffset * scale];
}
exports.getFrameOffsets = getFrameOffsets;

/**
 * Get box quads adjusted for iframes and zoom level.
 *
 * Warning: this function returns things that look like DOMQuad objects but
 * aren't (they resemble an old version of the spec). Unlike the return value
 * of node.getBoxQuads, they have a .bounds property and not a .getBounds()
 * method.
 *
 * @param {DOMWindow} boundaryWindow
 *        The window where to stop to iterate. If `null` is given, the top
 *        window is used.
 * @param {DOMNode} node
 *        The node for which we are to get the box model region
 *        quads.
 * @param {String} region
 *        The box model region to return: "content", "padding", "border" or
 *        "margin".
 * @param {Object} [options.ignoreZoom=false]
 *        Ignore zoom used in the context of e.g. canvas.
 * @return {Array}
 *        An array of objects that have the same structure as quads returned by
 *        getBoxQuads. An empty array if the node has no quads or is invalid.
 */
function getAdjustedQuads(
  boundaryWindow,
  node,
  region,
  { ignoreZoom, ignoreScroll } = {}
) {
  if (!node || !node.getBoxQuads) {
    return [];
  }

  const quads = node.getBoxQuads({
    box: region,
    relativeTo: boundaryWindow.document,
    createFramesForSuppressedWhitespace: false,
  });

  if (!quads.length) {
    return [];
  }

  const scale = ignoreZoom ? 1 : getCurrentZoom(node);
  const { scrollX, scrollY } = ignoreScroll
    ? { scrollX: 0, scrollY: 0 }
    : boundaryWindow;

  const xOffset = scrollX * scale;
  const yOffset = scrollY * scale;

  const adjustedQuads = [];
  for (const quad of quads) {
    const bounds = quad.getBounds();
    adjustedQuads.push({
      p1: {
        w: quad.p1.w * scale,
        x: quad.p1.x * scale + xOffset,
        y: quad.p1.y * scale + yOffset,
        z: quad.p1.z * scale,
      },
      p2: {
        w: quad.p2.w * scale,
        x: quad.p2.x * scale + xOffset,
        y: quad.p2.y * scale + yOffset,
        z: quad.p2.z * scale,
      },
      p3: {
        w: quad.p3.w * scale,
        x: quad.p3.x * scale + xOffset,
        y: quad.p3.y * scale + yOffset,
        z: quad.p3.z * scale,
      },
      p4: {
        w: quad.p4.w * scale,
        x: quad.p4.x * scale + xOffset,
        y: quad.p4.y * scale + yOffset,
        z: quad.p4.z * scale,
      },
      bounds: {
        bottom: bounds.bottom * scale + yOffset,
        height: bounds.height * scale,
        left: bounds.left * scale + xOffset,
        right: bounds.right * scale + xOffset,
        top: bounds.top * scale + yOffset,
        width: bounds.width * scale,
        x: bounds.x * scale + xOffset,
        y: bounds.y * scale + yOffset,
      },
    });
  }

  return adjustedQuads;
}
exports.getAdjustedQuads = getAdjustedQuads;

/**
 * Compute the absolute position and the dimensions of a node, relativalely
 * to the root window.

 * @param {DOMWindow} boundaryWindow
 *        The window where to stop to iterate. If `null` is given, the top
 *        window is used.
 * @param {DOMNode} node
 *        a DOM element to get the bounds for
 * @param {DOMWindow} contentWindow
 *        the content window holding the node
 * @return {Object}
 *         A rect object with the {top, left, width, height} properties
 */
function getRect(boundaryWindow, node, contentWindow) {
  let frameWin = node.ownerDocument.defaultView;
  const clientRect = node.getBoundingClientRect();

  if (boundaryWindow === null) {
    boundaryWindow = DevToolsUtils.getTopWindow(frameWin);
  } else if (typeof boundaryWindow === "undefined") {
    throw new Error("No boundaryWindow given. Use null for the default one.");
  }

  // Go up in the tree of frames to determine the correct rectangle.
  // clientRect is read-only, we need to be able to change properties.
  const rect = {
    top: clientRect.top + contentWindow.pageYOffset,
    left: clientRect.left + contentWindow.pageXOffset,
    width: clientRect.width,
    height: clientRect.height,
  };

  // We iterate through all the parent windows.
  while (frameWin !== boundaryWindow) {
    const frameElement = getFrameElement(frameWin);
    if (!frameElement) {
      break;
    }

    // We are in an iframe.
    // We take into account the parent iframe position and its
    // offset (borders and padding).
    const frameRect = frameElement.getBoundingClientRect();

    const [offsetTop, offsetLeft] = getFrameContentOffset(frameElement);

    rect.top += frameRect.top + offsetTop;
    rect.left += frameRect.left + offsetLeft;

    frameWin = frameWin.parent;
  }

  return rect;
}
exports.getRect = getRect;

/**
 * Get the 4 bounding points for a node taking iframes into account.
 * Note that for transformed nodes, this will return the untransformed bound.
 *
 * @param {DOMWindow} boundaryWindow
 *        The window where to stop to iterate. If `null` is given, the top
 *        window is used.
 * @param {DOMNode} node
 * @return {Object}
 *         An object with p1,p2,p3,p4 properties being {x,y} objects
 */
function getNodeBounds(boundaryWindow, node) {
  if (!node) {
    return null;
  }
  const { scrollX, scrollY } = boundaryWindow;
  const scale = getCurrentZoom(node);

  // Find out the offset of the node in its current frame
  let offsetLeft = 0;
  let offsetTop = 0;
  let el = node;
  while (el?.parentNode) {
    offsetLeft += el.offsetLeft;
    offsetTop += el.offsetTop;
    el = el.offsetParent;
  }

  // Also take scrolled containers into account
  el = node;
  while (el?.parentNode) {
    if (el.scrollTop) {
      offsetTop -= el.scrollTop;
    }
    if (el.scrollLeft) {
      offsetLeft -= el.scrollLeft;
    }
    el = el.parentNode;
  }

  // And add the potential frame offset if the node is nested
  let [xOffset, yOffset] = getFrameOffsets(boundaryWindow, node);
  xOffset += (offsetLeft + scrollX) * scale;
  yOffset += (offsetTop + scrollY) * scale;

  // Get the width and height
  const width = node.offsetWidth * scale;
  const height = node.offsetHeight * scale;

  return {
    p1: { x: xOffset, y: yOffset },
    p2: { x: xOffset + width, y: yOffset },
    p3: { x: xOffset + width, y: yOffset + height },
    p4: { x: xOffset, y: yOffset + height },
    top: yOffset,
    right: xOffset + width,
    bottom: yOffset + height,
    left: xOffset,
    width,
    height,
  };
}
exports.getNodeBounds = getNodeBounds;

/**
 * Same as doing iframe.contentWindow but works with all types of container
 * elements that act like frames (e.g. <embed>), where 'contentWindow' isn't a
 * property that can be accessed.
 * This uses the inIDeepTreeWalker instead.
 * @param {DOMNode} frame
 * @return {Window}
 */
function safelyGetContentWindow(frame) {
  if (frame.contentWindow) {
    return frame.contentWindow;
  }

  const walker = Cc["@mozilla.org/inspector/deep-tree-walker;1"].createInstance(
    Ci.inIDeepTreeWalker
  );
  walker.showSubDocuments = true;
  walker.showDocumentsAsNodes = true;
  walker.init(frame);
  walker.currentNode = frame;

  const document = walker.nextNode();
  if (!document || !document.defaultView) {
    throw new Error("Couldn't get the content window inside frame " + frame);
  }

  return document.defaultView;
}

/**
 * Returns a frame's content offset (frame border + padding).
 * Note: this function shouldn't need to exist, had the platform provided a
 * suitable API for determining the offset between the frame's content and
 * its bounding client rect. Bug 626359 should provide us with such an API.
 *
 * @param {DOMNode} frame
 *        The frame.
 * @return {Array} [offsetTop, offsetLeft]
 *         offsetTop is the distance from the top of the frame and the top of
 *         the content document.
 *         offsetLeft is the distance from the left of the frame and the left
 *         of the content document.
 */
function getFrameContentOffset(frame) {
  const style = safelyGetContentWindow(frame).getComputedStyle(frame);

  // In some cases, the computed style is null
  if (!style) {
    return [0, 0];
  }

  const paddingTop = parseInt(style.getPropertyValue("padding-top"), 10);
  const paddingLeft = parseInt(style.getPropertyValue("padding-left"), 10);

  const borderTop = parseInt(style.getPropertyValue("border-top-width"), 10);
  const borderLeft = parseInt(style.getPropertyValue("border-left-width"), 10);

  return [borderTop + paddingTop, borderLeft + paddingLeft];
}

/**
 * Check if a node and its document are still alive
 * and attached to the window.
 *
 * @param {DOMNode} node
 * @return {Boolean}
 */
function isNodeConnected(node) {
  if (!node.ownerDocument || !node.ownerDocument.defaultView) {
    return false;
  }

  try {
    return !(
      node.compareDocumentPosition(node.ownerDocument.documentElement) &
      node.DOCUMENT_POSITION_DISCONNECTED
    );
  } catch (e) {
    // "can't access dead object" error
    return false;
  }
}
exports.isNodeConnected = isNodeConnected;

/**
 * Determine whether a node is anonymous.
 *
 * @param {DOMNode} node
 * @return {Boolean}
 *
 * FIXME(bug 1597411): Remove one of these (or both, as
 * `node.isNativeAnonymous` is quite clear).
 */
const isAnonymous = node => node.isNativeAnonymous;
exports.isAnonymous = isAnonymous;
exports.isNativeAnonymous = isAnonymous;

/**
 * Determine whether a node is a template element.
 *
 * @param {DOMNode} node
 * @return {Boolean}
 */
function isTemplateElement(node) {
  return (
    node.ownerGlobal && node.ownerGlobal.HTMLTemplateElement.isInstance(node)
  );
}
exports.isTemplateElement = isTemplateElement;

/**
 * Determine whether a node is a shadow root.
 *
 * @param {DOMNode} node
 * @return {Boolean}
 */
const isShadowRoot = node => node.containingShadowRoot == node;
exports.isShadowRoot = isShadowRoot;

/*
 * Gets the shadow root mode (open or closed).
 *
 * @param {DOMNode} node
 * @return {String|null}
 */
function getShadowRootMode(node) {
  return isShadowRoot(node) ? node.mode : null;
}
exports.getShadowRootMode = getShadowRootMode;

/**
 * Determine whether a node is a shadow host, ie. an element that has a shadowRoot
 * attached to itself.
 *
 * @param {DOMNode} node
 * @return {Boolean}
 */
function isShadowHost(node) {
  const shadowRoot = node.openOrClosedShadowRoot;
  return shadowRoot && shadowRoot.nodeType === Node.DOCUMENT_FRAGMENT_NODE;
}
exports.isShadowHost = isShadowHost;

/**
 * Determine whether a node is a child of a shadow host. Even if the element has been
 * assigned to a slot in the attached shadow DOM, the parent node for this element is
 * still considered to be the "host" element, and we need to walk them differently.
 *
 * @param {DOMNode} node
 * @return {Boolean}
 */
function isDirectShadowHostChild(node) {
  // Pseudo elements and native anonymous elements are always part of the anonymous tree.
  if (
    isMarkerPseudoElement(node) ||
    isBeforePseudoElement(node) ||
    isAfterPseudoElement(node) ||
    node.isNativeAnonymous
  ) {
    return false;
  }

  const parentNode = node.parentNode;
  return parentNode && !!parentNode.openOrClosedShadowRoot;
}
exports.isDirectShadowHostChild = isDirectShadowHostChild;

/**
 * Determine whether a node is a ::marker pseudo.
 *
 * @param {DOMNode} node
 * @return {Boolean}
 */
function isMarkerPseudoElement(node) {
  return node.nodeName === "_moz_generated_content_marker";
}
exports.isMarkerPseudoElement = isMarkerPseudoElement;

/**
 * Determine whether a node is a ::before pseudo.
 *
 * @param {DOMNode} node
 * @return {Boolean}
 */
function isBeforePseudoElement(node) {
  return node.nodeName === "_moz_generated_content_before";
}
exports.isBeforePseudoElement = isBeforePseudoElement;

/**
 * Determine whether a node is a ::after pseudo.
 *
 * @param {DOMNode} node
 * @return {Boolean}
 */
function isAfterPseudoElement(node) {
  return node.nodeName === "_moz_generated_content_after";
}
exports.isAfterPseudoElement = isAfterPseudoElement;

/**
 * Get the current zoom factor applied to the container window of a given node.
 * @param {DOMNode|DOMWindow}
 *        The node for which the zoom factor should be calculated, or its
 *        owner window.
 * @return {Number}
 */
function getCurrentZoom(node) {
  const win = getWindowFor(node);

  if (!win) {
    throw new Error("Unable to get the zoom from the given argument.");
  }

  return win.browsingContext?.fullZoom || 1.0;
}
exports.getCurrentZoom = getCurrentZoom;

/**
 * Get the display pixel ratio for a given window.
 * The `devicePixelRatio` property is affected by the zoom (see bug 809788), so we have to
 * divide by the zoom value in order to get just the display density, expressed as pixel
 * ratio (the physical display pixel compares to a pixel on a “normal” density screen).
 *
 * @param {DOMNode|DOMWindow}
 *        The node for which the zoom factor should be calculated, or its
 *        owner window.
 * @return {Number}
 */
function getDisplayPixelRatio(node) {
  const win = getWindowFor(node);
  return win.devicePixelRatio / getCurrentZoom(node);
}
exports.getDisplayPixelRatio = getDisplayPixelRatio;

/**
 * Returns the window's dimensions for the `window` given.
 *
 * @return {Object} An object with `width` and `height` properties, representing the
 * number of pixels for the document's size.
 */
function getWindowDimensions(window) {
  // First we'll try without flushing layout, because it's way faster.
  const windowUtils = utilsFor(window);
  let { width, height } = windowUtils.getRootBounds();

  if (!width || !height) {
    // We need a flush after all :'(
    width = window.innerWidth + window.scrollMaxX - window.scrollMinX;
    height = window.innerHeight + window.scrollMaxY - window.scrollMinY;

    const scrollbarHeight = {};
    const scrollbarWidth = {};
    windowUtils.getScrollbarSize(false, scrollbarWidth, scrollbarHeight);
    width -= scrollbarWidth.value;
    height -= scrollbarHeight.value;
  }

  return { width, height };
}
exports.getWindowDimensions = getWindowDimensions;

/**
 * Returns the viewport's dimensions for the `window` given.
 *
 * @return {Object} An object with `width` and `height` properties, representing the
 * number of pixels for the viewport's size.
 */
function getViewportDimensions(window) {
  const windowUtils = utilsFor(window);

  const scrollbarHeight = {};
  const scrollbarWidth = {};
  windowUtils.getScrollbarSize(false, scrollbarWidth, scrollbarHeight);

  const width = window.innerWidth - scrollbarWidth.value;
  const height = window.innerHeight - scrollbarHeight.value;

  return { width, height };
}
exports.getViewportDimensions = getViewportDimensions;

/**
 * Return the default view for a given node, where node can be:
 * - a DOM node
 * - the document node
 * - the window itself
 * @param {DOMNode|DOMWindow|DOMDocument} node The node to get the window for.
 * @return {DOMWindow}
 */
function getWindowFor(node) {
  if (Node.isInstance(node)) {
    if (node.nodeType === node.DOCUMENT_NODE) {
      return node.defaultView;
    }
    return node.ownerDocument.defaultView;
  } else if (node instanceof Ci.nsIDOMWindow) {
    return node;
  }
  return null;
}

/**
 * Synchronously loads a style sheet from `uri` and adds it to the list of
 * additional style sheets of the document.
 * The sheets added takes effect immediately, and only on the document of the
 * `window` given.
 *
 * @param {DOMWindow} window
 * @param {String} url
 * @param {String} [type="agent"]
 */
function loadSheet(window, url, type = "agent") {
  if (!(type in SHEET_TYPE)) {
    type = "agent";
  }

  const windowUtils = utilsFor(window);
  try {
    windowUtils.loadSheetUsingURIString(url, windowUtils[SHEET_TYPE[type]]);
  } catch (e) {
    // The method fails if the url is already loaded.
  }
}
exports.loadSheet = loadSheet;

/**
 * Remove the document style sheet at `sheetURI` from the list of additional
 * style sheets of the document. The removal takes effect immediately.
 *
 * @param {DOMWindow} window
 * @param {String} url
 * @param {String} [type="agent"]
 */
function removeSheet(window, url, type = "agent") {
  if (!(type in SHEET_TYPE)) {
    type = "agent";
  }

  const windowUtils = utilsFor(window);
  try {
    windowUtils.removeSheetUsingURIString(url, windowUtils[SHEET_TYPE[type]]);
  } catch (e) {
    // The method fails if the url is already removed.
  }
}
exports.removeSheet = removeSheet;

/**
 * Get the untransformed coordinates for a node.
 *
 * @param  {DOMNode} node
 *         The node for which the DOMQuad is to be returned.
 * @param  {String} region
 *         The box model region to return: "content", "padding", "border" or
 *         "margin".
 * @return {DOMQuad}
 *         A DOMQuad representation of the node.
 */
function getUntransformedQuad(node, region = "border") {
  // Get the inverse transformation matrix for the node.
  const matrix = node.getTransformToViewport();
  const inverse = matrix.inverse();
  const win = node.ownerGlobal;

  // Get the adjusted quads for the node (including scroll offsets).
  const quads = getAdjustedQuads(win, node, region, {
    ignoreZoom: true,
  });

  // Create DOMPoints from the transformed node position.
  const p1 = new DOMPoint(quads[0].p1.x, quads[0].p1.y);
  const p2 = new DOMPoint(quads[0].p2.x, quads[0].p2.y);
  const p3 = new DOMPoint(quads[0].p3.x, quads[0].p3.y);
  const p4 = new DOMPoint(quads[0].p4.x, quads[0].p4.y);

  // Apply the inverse transformation matrix to the points to get the
  // untransformed points.
  const ip1 = inverse.transformPoint(p1);
  const ip2 = inverse.transformPoint(p2);
  const ip3 = inverse.transformPoint(p3);
  const ip4 = inverse.transformPoint(p4);

  // Save the results in a DOMQuad.
  const quad = new DOMQuad(
    { x: ip1.x, y: ip1.y },
    { x: ip2.x, y: ip2.y },
    { x: ip3.x, y: ip3.y },
    { x: ip4.x, y: ip4.y }
  );

  // Remove the border offsets because we include them when calculating
  // offsets in the while loop.
  const style = win.getComputedStyle(node);
  const leftAdjustment = parseInt(style.borderLeftWidth, 10) || 0;
  const topAdjustment = parseInt(style.borderTopWidth, 10) || 0;

  quad.p1.x -= leftAdjustment;
  quad.p2.x -= leftAdjustment;
  quad.p3.x -= leftAdjustment;
  quad.p4.x -= leftAdjustment;
  quad.p1.y -= topAdjustment;
  quad.p2.y -= topAdjustment;
  quad.p3.y -= topAdjustment;
  quad.p4.y -= topAdjustment;

  // Calculate offsets.
  while (node) {
    const nodeStyle = win.getComputedStyle(node);
    const borderLeftWidth = parseInt(nodeStyle.borderLeftWidth, 10) || 0;
    const borderTopWidth = parseInt(nodeStyle.borderTopWidth, 10) || 0;
    const leftOffset = node.offsetLeft - node.scrollLeft + borderLeftWidth;
    const topOffset = node.offsetTop - node.scrollTop + borderTopWidth;

    quad.p1.x += leftOffset;
    quad.p2.x += leftOffset;
    quad.p3.x += leftOffset;
    quad.p4.x += leftOffset;
    quad.p1.y += topOffset;
    quad.p2.y += topOffset;
    quad.p3.y += topOffset;
    quad.p4.y += topOffset;

    node = node.offsetParent;
  }

  return quad;
}
exports.getUntransformedQuad = getUntransformedQuad;

/**
 * Calculate the total of the node and all of its ancestor's scrollTop and
 * scrollLeft values.
 *
 * @param  {DOMNode} node
 *         The node for which the absolute scroll offsets should be calculated.
 * @return {Object} object
 *         An object containing scrollTop and scrollLeft values.
 * @return {Number} object.scrollLeft
 *         The total scrollLeft values of the node and all of its ancestors.
 * @return {Number} object.scrollTop
 *         The total scrollTop values of the node and all of its ancestors.
 */
function getAbsoluteScrollOffsetsForNode(node) {
  const doc = node.ownerDocument;

  // Our walker will only iterate up to document.body so we start by saving the
  // scroll values for `document.documentElement`.
  let scrollTop = doc.documentElement.scrollTop;
  let scrollLeft = doc.documentElement.scrollLeft;
  const walker = doc.createTreeWalker(doc.body, NodeFilter.SHOW_ELEMENT);
  walker.currentNode = node;
  let currentNode = walker.currentNode;

  // Iterate from `node` up the tree to `document.body` adding scroll offsets
  // as we go.
  while (currentNode) {
    const nodeScrollTop = currentNode.scrollTop;
    const nodeScrollLeft = currentNode.scrollLeft;

    if (nodeScrollTop || nodeScrollLeft) {
      scrollTop += nodeScrollTop;
      scrollLeft += nodeScrollLeft;
    }

    currentNode = walker.parentNode();
  }

  return {
    scrollLeft,
    scrollTop,
  };
}
exports.getAbsoluteScrollOffsetsForNode = getAbsoluteScrollOffsetsForNode;

/**
 * Check if the provided node is a <frame> or <iframe> element.
 *
 * @param {DOMNode} node
 * @returns {Boolean}
 */
function isFrame(node) {
  const className = ChromeUtils.getClassName(node);
  return className == "HTMLIFrameElement" || className == "HTMLFrameElement";
}

/**
 * Check if the provided node is representing a remote <browser> element.
 *
 * @param  {DOMNode} node
 * @return {Boolean}
 */
function isRemoteBrowserElement(node) {
  return (
    ChromeUtils.getClassName(node) == "XULFrameElement" &&
    !node.childNodes.length &&
    node.getAttribute("remote") == "true"
  );
}
exports.isRemoteBrowserElement = isRemoteBrowserElement;

/**
 * Check if the provided node is representing a remote frame.
 *
 * - In the context of the browser toolbox, a remote frame can be the <browser remote>
 * element found inside each tab.
 * - In the context of the content toolbox, a remote frame can be a <iframe> that contains
 * a different origin document.
 *
 * @param  {DOMNode} node
 * @return {Boolean}
 */
function isRemoteFrame(node) {
  if (isFrame(node)) {
    return node.frameLoader?.isRemoteFrame;
  }

  if (isRemoteBrowserElement(node)) {
    return true;
  }

  return false;
}
exports.isRemoteFrame = isRemoteFrame;

/**
 * Check if the provided node is representing a frame that has its own dedicated child target.
 *
 * @param {BrowsingContextTargetActor} targetActor
 * @param {DOMNode} node
 * @returns {Boolean}
 */
function isFrameWithChildTarget(targetActor, node) {
  // If the iframe is blocked because of CSP, it won't have a document (and no associated targets)
  if (isFrameBlockedByCSP(node)) {
    return false;
  }

  return isRemoteFrame(node) || (isFrame(node) && targetActor.ignoreSubFrames);
}

exports.isFrameWithChildTarget = isFrameWithChildTarget;

/**
 * Check if the provided node is representing a frame that is blocked by CSP.
 *
 * @param {DOMNode} node
 * @returns {Boolean}
 */
function isFrameBlockedByCSP(node) {
  if (!isFrame(node)) {
    return false;
  }

  if (!node.src) {
    return false;
  }

  let uri;
  try {
    uri = lazy.NetUtil.newURI(node.src);
  } catch (e) {
    return false;
  }

  const res = node.ownerDocument.csp.shouldLoad(
    Ci.nsIContentPolicy.TYPE_SUBDOCUMENT,
    null, // nsICSPEventListener
    uri,
    null, // aOriginalURIIfRedirect
    false, // aSendViolationReports
    null, // aNonce
    false // aParserCreated
  );

  return res !== Ci.nsIContentPolicy.ACCEPT;
}

exports.isFrameBlockedByCSP = isFrameBlockedByCSP;