/* -*- 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 GridTracks_Binding::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