dom/grid/Grid.cpp

   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 "Grid.h"
   8
   9 #include "GridArea.h"
  10 #include "GridDimension.h"
  11 #include "mozilla/dom/Element.h"
  12 #include "mozilla/dom/GridBinding.h"
  13 #include "nsGridContainerFrame.h"
  14 #include "nsTHashSet.h"
  15
  16 namespace mozilla::dom {
  17
  18 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(Grid)
  19
  20 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(Grid)
  21   tmp->ForgetFrame();
  22   NS_IMPL_CYCLE_COLLECTION_UNLINK(mParent, mRows, mCols, mAreas)
  23   NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
  24 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
  25
  26 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Grid)
  27   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent, mRows, mCols, mAreas)
  28 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
  29
  30 NS_IMPL_CYCLE_COLLECTING_ADDREF(Grid)
  31 NS_IMPL_CYCLE_COLLECTING_RELEASE(Grid)
  32
  33 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Grid)
  34   NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
  35   NS_INTERFACE_MAP_ENTRY(nsISupports)
  36 NS_INTERFACE_MAP_END
  37
  38 Grid::Grid(nsISupports* aParent, nsGridContainerFrame* aFrame)
  39     : mParent(do_QueryInterface(aParent)),
  40       mFrame(aFrame),
  41       mRows(new GridDimension(this)),
  42       mCols(new GridDimension(this)) {
  43   MOZ_ASSERT(aFrame,
  44              "Should never be instantiated with a null nsGridContainerFrame");
  45
  46   aFrame->SetProperty(nsGridContainerFrame::GridFragmentInfo(), this);
  47
  48   // Construct areas first, because lines may need to reference them
  49   // to extract additional names for boundary lines.
  50
  51   // Add implicit areas first. Track the names that we add here, because
  52   // we will ignore future explicit areas with the same name.
  53   nsTHashSet<RefPtr<nsAtom>> namesSeen;
  54   nsGridContainerFrame::ImplicitNamedAreas* implicitAreas =
  55       aFrame->GetImplicitNamedAreas();
  56   if (implicitAreas) {
  57     for (auto iter = implicitAreas->iter(); !iter.done(); iter.next()) {
  58       auto& areaInfo = iter.get().value();
  59       namesSeen.Insert(areaInfo.name.AsAtom());
  60       GridArea* area =
  61           new GridArea(this, areaInfo.name.AsAtom(), GridDeclaration::Implicit,
  62                        areaInfo.rows.start, areaInfo.rows.end,
  63                        areaInfo.columns.start, areaInfo.columns.end);
  64       mAreas.AppendElement(area);
  65     }
  66   }
  67
  68   // Add explicit areas next, as long as they don't have the same name
  69   // as the implicit areas, because the implicit values override what was
  70   // initially available in the explicit areas.
  71   if (auto* explicitAreas = aFrame->GetExplicitNamedAreas()) {
  72     for (auto& areaInfo : explicitAreas->AsSpan()) {
  73       if (!namesSeen.Contains(areaInfo.name.AsAtom())) {
  74         GridArea* area = new GridArea(
  75             this, areaInfo.name.AsAtom(), GridDeclaration::Explicit,
  76             areaInfo.rows.start, areaInfo.rows.end, areaInfo.columns.start,
  77             areaInfo.columns.end);
  78         mAreas.AppendElement(area);
  79       }
  80     }
  81   }
  82
  83   // Now construct the tracks and lines.
  84   const ComputedGridTrackInfo* rowTrackInfo = aFrame->GetComputedTemplateRows();
  85   const ComputedGridLineInfo* rowLineInfo =
  86       aFrame->GetComputedTemplateRowLines();
  87   mRows->SetTrackInfo(rowTrackInfo);
  88   mRows->SetLineInfo(rowTrackInfo, rowLineInfo, mAreas, true);
  89
  90   const ComputedGridTrackInfo* columnTrackInfo =
  91       aFrame->GetComputedTemplateColumns();
  92   const ComputedGridLineInfo* columnLineInfo =
  93       aFrame->GetComputedTemplateColumnLines();
  94   mCols->SetTrackInfo(columnTrackInfo);
  95   mCols->SetLineInfo(columnTrackInfo, columnLineInfo, mAreas, false);
  96 }
  97
  98 Grid::~Grid() = default;
  99
 100 JSObject* Grid::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
 101   return Grid_Binding::Wrap(aCx, this, aGivenProto);
 102 }
 103
 104 void Grid::ForgetFrame() {
 105   if (mFrame.IsAlive()) {
 106     mFrame->RemoveProperty(nsGridContainerFrame::GridFragmentInfo());
 107     mFrame.Clear(mFrame->PresContext()->GetPresShell());
 108   }
 109 }
 110
 111 GridDimension* Grid::Rows() const { return mRows; }
 112
 113 GridDimension* Grid::Cols() const { return mCols; }
 114
 115 void Grid::GetAreas(nsTArray<RefPtr<GridArea>>& aAreas) const {
 116   aAreas = mAreas.Clone();
 117 }
 118
 119 }  // namespace mozilla::dom