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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/. */
#ifndef AnchorPositioningUtils_h__
#define AnchorPositioningUtils_h__
#include "mozilla/Maybe.h"
#include "nsRect.h"
struct AnchorPosResolutionData;
class nsAtom;
class nsIFrame;
template <class T>
class nsTArray;
namespace mozilla {
struct AnchorPosInfo {
// Border-box of the anchor frame, offset against `mContainingBlock`'s padding
// box.
nsRect mRect;
const nsIFrame* mContainingBlock;
};
/**
* AnchorPositioningUtils is a namespace class used for various anchor
* positioning helper functions that are useful in multiple places.
* The goal is to avoid code duplication and to avoid having too
* many helpers in nsLayoutUtils.
*/
struct AnchorPositioningUtils {
/**
* Finds the first acceptable frame from the list of possible anchor frames
* following https://drafts.csswg.org/css-anchor-position-1/#target
*/
static nsIFrame* FindFirstAcceptableAnchor(
const nsAtom* aName, const nsIFrame* aPositionedFrame,
const nsTArray<nsIFrame*>& aPossibleAnchorFrames);
static Maybe<AnchorPosInfo> GetAnchorPosRect(
const nsIFrame* aAbsoluteContainingBlock, const nsIFrame* aAnchor,
bool aCBRectIsvalid,
Maybe<AnchorPosResolutionData>* aReferencedAnchorsEntry);
};
} // namespace mozilla
#endif // AnchorPositioningUtils_h__
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