1 files changed, 134 insertions, 0 deletions
diff --git a/dom/grid/GridTracks.cpp b/dom/grid/GridTracks.cpp
new file mode 100644
index 000000000..8b607973c
--- /dev/null
+++ b/dom/grid/GridTracks.cpp
@@ -0,0 +1,134 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "GridTracks.h"
+
+#include "GridDimension.h"
+#include "GridTrack.h"
+#include "mozilla/dom/GridBinding.h"
+#include "nsGridContainerFrame.h"
+
+namespace mozilla {
+namespace dom {
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(GridTracks, mParent, mTracks)
+NS_IMPL_CYCLE_COLLECTING_ADDREF(GridTracks)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(GridTracks)
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(GridTracks)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+GridTracks::GridTracks(GridDimension *aParent)
+  : mParent(aParent)
+{
+  MOZ_ASSERT(aParent,
+    "Should never be instantiated with a null GridDimension");
+}
+
+GridTracks::~GridTracks()
+{
+}
+
+JSObject*
+GridTracks::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
+{
+  return GridTracksBinding::Wrap(aCx, this, aGivenProto);
+}
+
+uint32_t
+GridTracks::Length() const
+{
+  return mTracks.Length();
+}
+
+GridTrack*
+GridTracks::Item(uint32_t aIndex)
+{
+  return mTracks.SafeElementAt(aIndex);
+}
+
+GridTrack*
+GridTracks::IndexedGetter(uint32_t aIndex,
+                          bool& aFound)
+{
+  aFound = aIndex < mTracks.Length();
+  if (!aFound) {
+    return nullptr;
+  }
+  return mTracks[aIndex];
+}
+
+void
+GridTracks::SetTrackInfo(const ComputedGridTrackInfo* aTrackInfo)
+{
+  // rebuild the tracks based on aTrackInfo
+  mTracks.Clear();
+
+  if (!aTrackInfo) {
+    return;
+  }
+
+  nscoord lastTrackEdge = 0;
+  uint32_t repeatIndex = 0;
+  auto AppendRemovedAutoFits = [this, &aTrackInfo, &lastTrackEdge,
+                                &repeatIndex]()
+  {
+    uint32_t numRepeatTracks = aTrackInfo->mRemovedRepeatTracks.Length();
+    // Add in removed auto-fit tracks
+    while (repeatIndex < numRepeatTracks &&
+         aTrackInfo->mRemovedRepeatTracks[repeatIndex]) {
+
+      RefPtr<GridTrack> track = new GridTrack(this);
+      mTracks.AppendElement(track);
+      track->SetTrackValues(
+        nsPresContext::AppUnitsToDoubleCSSPixels(lastTrackEdge),
+        nsPresContext::AppUnitsToDoubleCSSPixels(0),
+        GridDeclaration::Explicit,
+        GridTrackState::Removed
+      );
+      repeatIndex++;
+    }
+    repeatIndex++;
+  };
+
+  for (size_t i = aTrackInfo->mStartFragmentTrack;
+       i < aTrackInfo->mEndFragmentTrack;
+       i++) {
+    if (i >= aTrackInfo->mRepeatFirstTrack) {
+      // Append removed auto-fit tracks, if appropriate. The
+      // AppendRemovedAutoFits function exits early once it has been called
+      // aTrackInfo->mRemovedRepeatTracks.Length() times -- a check we don't
+      // replicate here or at subsequent calling sites.
+      AppendRemovedAutoFits();
+    }
+
+    RefPtr<GridTrack> track = new GridTrack(this);
+    mTracks.AppendElement(track);
+    track->SetTrackValues(
+      nsPresContext::AppUnitsToDoubleCSSPixels(aTrackInfo->mPositions[i]),
+      nsPresContext::AppUnitsToDoubleCSSPixels(aTrackInfo->mSizes[i]),
+      (
+        // Implicit if index is before the first explicit track, or after
+        // the last explicit track.
+        (i < aTrackInfo->mNumLeadingImplicitTracks) ||
+        (i >= aTrackInfo->mNumLeadingImplicitTracks +
+              aTrackInfo->mNumExplicitTracks) ?
+          GridDeclaration::Implicit :
+          GridDeclaration::Explicit
+      ),
+      GridTrackState(aTrackInfo->mStates[i])
+    );
+
+    lastTrackEdge = aTrackInfo->mPositions[i] + aTrackInfo->mSizes[i];
+  }
+
+  // Append any trailing removed auto-fit tracks.
+  AppendRemovedAutoFits();
+}
+
+} // namespace dom
+} // namespace mozilla