tor-browser

The Tor Browser
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Flex.cpp (2237B)

      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