dom/flex/Flex.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 "Flex.h"
   8
   9 #include "FlexLineValues.h"
  10 #include "mozilla/dom/Element.h"
  11 #include "mozilla/dom/FlexBinding.h"
  12 #include "nsFlexContainerFrame.h"
  13
  14 namespace mozilla::dom {
  15
  16 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(Flex, mParent, mLines)
  17 NS_IMPL_CYCLE_COLLECTING_ADDREF(Flex)
  18 NS_IMPL_CYCLE_COLLECTING_RELEASE(Flex)
  19 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Flex)
  20   NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
  21   NS_INTERFACE_MAP_ENTRY(nsISupports)
  22 NS_INTERFACE_MAP_END
  23
  24 Flex::Flex(Element* aParent, nsFlexContainerFrame* aFrame) : mParent(aParent) {
  25   MOZ_ASSERT(aFrame,
  26              "Should never be instantiated with a null nsFlexContainerFrame");
  27
  28   // Eagerly create property values from aFrame, because we're not
  29   // going to keep it around.
  30   const ComputedFlexContainerInfo* containerInfo =
  31       aFrame->GetFlexContainerInfo();
  32   if (!containerInfo) {
  33     // It's weird but possible to fail to get a ComputedFlexContainerInfo
  34     // structure. Assign sensible default values.
  35     mMainAxisDirection = FlexPhysicalDirection::Horizontal_lr;
  36     mCrossAxisDirection = FlexPhysicalDirection::Vertical_tb;
  37     return;
  38   }
  39   mLines.SetLength(containerInfo->mLines.Length());
  40   uint32_t index = 0;
  41   for (auto&& l : containerInfo->mLines) {
  42     FlexLineValues* line = new FlexLineValues(this, &l);
  43     mLines.ElementAt(index) = line;
  44     index++;
  45   }
  46
  47   mMainAxisDirection = containerInfo->mMainAxisDirection;
  48   mCrossAxisDirection = containerInfo->mCrossAxisDirection;
  49 }
  50
  51 JSObject* Flex::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
  52   return Flex_Binding::Wrap(aCx, this, aGivenProto);
  53 }
  54
  55 void Flex::GetLines(nsTArray<RefPtr<FlexLineValues>>& aResult) {
  56   aResult.AppendElements(mLines);
  57 }
  58
  59 FlexPhysicalDirection Flex::MainAxisDirection() const {
  60   return mMainAxisDirection;
  61 }
  62
  63 FlexPhysicalDirection Flex::CrossAxisDirection() const {
  64   return mCrossAxisDirection;
  65 }
  66
  67 }  // namespace mozilla::dom