1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6
7 #include "GridTracks.h"
8
9 #include "GridDimension.h"
10 #include "GridTrack.h"
11 #include "mozilla/dom/GridBinding.h"
12 #include "nsGridContainerFrame.h"
13
14 namespace mozilla {
15 namespace dom {
16
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(GridTracks,mParent,mTracks)17 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(GridTracks, mParent, mTracks)
18 NS_IMPL_CYCLE_COLLECTING_ADDREF(GridTracks)
19 NS_IMPL_CYCLE_COLLECTING_RELEASE(GridTracks)
20 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(GridTracks)
21 NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
22 NS_INTERFACE_MAP_ENTRY(nsISupports)
23 NS_INTERFACE_MAP_END
24
25 GridTracks::GridTracks(GridDimension* aParent) : mParent(aParent) {
26 MOZ_ASSERT(aParent, "Should never be instantiated with a null GridDimension");
27 }
28
29 GridTracks::~GridTracks() = default;
30
WrapObject(JSContext * aCx,JS::Handle<JSObject * > aGivenProto)31 JSObject* GridTracks::WrapObject(JSContext* aCx,
32 JS::Handle<JSObject*> aGivenProto) {
33 return GridTracks_Binding::Wrap(aCx, this, aGivenProto);
34 }
35
Length() const36 uint32_t GridTracks::Length() const { return mTracks.Length(); }
37
Item(uint32_t aIndex)38 GridTrack* GridTracks::Item(uint32_t aIndex) {
39 return mTracks.SafeElementAt(aIndex);
40 }
41
IndexedGetter(uint32_t aIndex,bool & aFound)42 GridTrack* GridTracks::IndexedGetter(uint32_t aIndex, bool& aFound) {
43 aFound = aIndex < mTracks.Length();
44 if (!aFound) {
45 return nullptr;
46 }
47 return mTracks[aIndex];
48 }
49
SetTrackInfo(const ComputedGridTrackInfo * aTrackInfo)50 void GridTracks::SetTrackInfo(const ComputedGridTrackInfo* aTrackInfo) {
51 // rebuild the tracks based on aTrackInfo
52 mTracks.Clear();
53
54 if (!aTrackInfo) {
55 return;
56 }
57
58 nscoord lastTrackEdge = 0;
59 uint32_t repeatIndex = 0;
60 auto AppendRemovedAutoFits = [this, &aTrackInfo, &lastTrackEdge,
61 &repeatIndex]() {
62 uint32_t numRepeatTracks = aTrackInfo->mRemovedRepeatTracks.Length();
63 // Add in removed auto-fit tracks
64 while (repeatIndex < numRepeatTracks &&
65 aTrackInfo->mRemovedRepeatTracks[repeatIndex]) {
66 RefPtr<GridTrack> track = new GridTrack(this);
67 mTracks.AppendElement(track);
68 track->SetTrackValues(
69 nsPresContext::AppUnitsToDoubleCSSPixels(lastTrackEdge),
70 nsPresContext::AppUnitsToDoubleCSSPixels(0),
71 GridDeclaration::Explicit, GridTrackState::Removed);
72 repeatIndex++;
73 }
74 repeatIndex++;
75 };
76
77 for (size_t i = aTrackInfo->mStartFragmentTrack;
78 i < aTrackInfo->mEndFragmentTrack; i++) {
79 if (i >= aTrackInfo->mRepeatFirstTrack) {
80 // Append removed auto-fit tracks, if appropriate. The
81 // AppendRemovedAutoFits function exits early once it has been called
82 // aTrackInfo->mRemovedRepeatTracks.Length() times -- a check we don't
83 // replicate here or at subsequent calling sites.
84 AppendRemovedAutoFits();
85 }
86
87 RefPtr<GridTrack> track = new GridTrack(this);
88 mTracks.AppendElement(track);
89 track->SetTrackValues(
90 nsPresContext::AppUnitsToDoubleCSSPixels(aTrackInfo->mPositions[i]),
91 nsPresContext::AppUnitsToDoubleCSSPixels(aTrackInfo->mSizes[i]),
92 (
93 // Implicit if index is before the first explicit track, or after
94 // the last explicit track.
95 (i < aTrackInfo->mNumLeadingImplicitTracks) ||
96 (i >= aTrackInfo->mNumLeadingImplicitTracks +
97 aTrackInfo->mNumExplicitTracks)
98 ? GridDeclaration::Implicit
99 : GridDeclaration::Explicit),
100 GridTrackState(aTrackInfo->mStates[i]));
101
102 lastTrackEdge = aTrackInfo->mPositions[i] + aTrackInfo->mSizes[i];
103 }
104
105 // Append any trailing removed auto-fit tracks.
106 AppendRemovedAutoFits();
107 }
108
109 } // namespace dom
110 } // namespace mozilla
111