FlexItemValues.cpp

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/* -*- 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 "FlexItemValues.h"

#include "mozilla/dom/DOMRect.h"

#include "mozilla/dom/FlexBinding.h"

#include "mozilla/dom/FlexLineValues.h"

#include "nsFlexContainerFrame.h"

namespace mozilla::dom {

NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(FlexItemValues, mParent, mNode,

                                      mFrameRect)

NS_IMPL_CYCLE_COLLECTING_ADDREF(FlexItemValues)

NS_IMPL_CYCLE_COLLECTING_RELEASE(FlexItemValues)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(FlexItemValues)

  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY

  NS_INTERFACE_MAP_ENTRY(nsISupports)

NS_INTERFACE_MAP_END

/**

 * Utility function to convert a nscoord size to CSS pixel values, with

 * graceful treatment of NS_UNCONSTRAINEDSIZE (which this function converts to

 * the double "positive infinity" value).

 * This function is suitable for converting quantities that are expected to

 * sometimes legitimately (rather than arbitrarily/accidentally) contain the

 * sentinel value NS_UNCONSTRAINEDSIZE -- e.g. to handle "max-width: none".

*/

static double ToPossiblyUnconstrainedPixels(nscoord aSize) {

  if (aSize == NS_UNCONSTRAINEDSIZE) {

    return std::numeric_limits<double>::infinity();

  return nsPresContext::AppUnitsToDoubleCSSPixels(aSize);

FlexItemValues::FlexItemValues(FlexLineValues* aParent,

                               const ComputedFlexItemInfo* aItem)

    : mParent(aParent) {

  MOZ_ASSERT(aItem,

             "Should never be instantiated with a null ComputedFlexLineInfo.");

  // Eagerly copy values from aItem, because we're not

  // going to keep it around.

  mNode = aItem->mNode;

  // Since mNode might be null, we associate the mFrameRect with

  // our parent.

  mFrameRect = new DOMRectReadOnly(

      mParent, nsPresContext::AppUnitsToDoubleCSSPixels(aItem->mFrameRect.X()),

      nsPresContext::AppUnitsToDoubleCSSPixels(aItem->mFrameRect.Y()),

      nsPresContext::AppUnitsToDoubleCSSPixels(aItem->mFrameRect.Width()),

      nsPresContext::AppUnitsToDoubleCSSPixels(aItem->mFrameRect.Height()));

  // Convert app unit sizes to css pixel sizes.

  mMainBaseSize =

      nsPresContext::AppUnitsToDoubleCSSPixels(aItem->mMainBaseSize);

  mMainDeltaSize =

      nsPresContext::AppUnitsToDoubleCSSPixels(aItem->mMainDeltaSize);

  mMainMinSize = nsPresContext::AppUnitsToDoubleCSSPixels(aItem->mMainMinSize);

  mMainMaxSize = ToPossiblyUnconstrainedPixels(aItem->mMainMaxSize);

  mCrossMinSize =

      nsPresContext::AppUnitsToDoubleCSSPixels(aItem->mCrossMinSize);

  mCrossMaxSize = ToPossiblyUnconstrainedPixels(aItem->mCrossMaxSize);

  mClampState = aItem->mClampState;

JSObject* FlexItemValues::WrapObject(JSContext* aCx,

                                     JS::Handle<JSObject*> aGivenProto) {

  return FlexItemValues_Binding::Wrap(aCx, this, aGivenProto);

nsINode* FlexItemValues::GetNode() const { return mNode; }

DOMRectReadOnly* FlexItemValues::FrameRect() const { return mFrameRect; }

double FlexItemValues::MainBaseSize() const { return mMainBaseSize; }

double FlexItemValues::MainDeltaSize() const { return mMainDeltaSize; }

double FlexItemValues::MainMinSize() const { return mMainMinSize; }

double FlexItemValues::MainMaxSize() const { return mMainMaxSize; }

double FlexItemValues::CrossMinSize() const { return mCrossMinSize; }

double FlexItemValues::CrossMaxSize() const { return mCrossMaxSize; }

FlexItemClampState FlexItemValues::ClampState() const { return mClampState; }

}  // namespace mozilla::dom