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/*
* Copyright (C) 2024 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "CSSValueKeywords.h"
#include "EventTarget.h"
#include "LayoutUnit.h"
#include "ScopedName.h"
#include "WritingMode.h"
#include <wtf/HashMap.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/WeakHashMap.h>
#include <wtf/WeakHashSet.h>
#include <wtf/text/AtomStringHash.h>
namespace WebCore {
class Document;
class Element;
class LayoutRect;
class RenderBlock;
class RenderBox;
class RenderBoxModelObject;
class RenderStyle;
struct PositionTryFallback;
enum CSSPropertyID : uint16_t;
namespace Style {
class BuilderState;
enum class AnchorPositionResolutionStage : uint8_t {
FindAnchors,
ResolveAnchorFunctions,
Resolved,
Positioned,
};
using AnchorElements = HashMap<AtomString, WeakPtr<Element, WeakPtrImplWithEventTargetData>>;
struct AnchorPositionedState {
WTF_MAKE_TZONE_ALLOCATED(AnchorPositionedState);
public:
AnchorElements anchorElements;
UncheckedKeyHashSet<AtomString> anchorNames;
AnchorPositionResolutionStage stage { AnchorPositionResolutionStage::FindAnchors };
bool hasAnchorFunctions { false };
};
using AnchorsForAnchorName = HashMap<AtomString, Vector<SingleThreadWeakRef<const RenderBoxModelObject>>>;
// https://drafts.csswg.org/css-anchor-position-1/#typedef-anchor-size
enum class AnchorSizeDimension : uint8_t {
Width,
Height,
Block,
Inline,
SelfBlock,
SelfInline
};
using AnchorPositionedStates = WeakHashMap<Element, std::unique_ptr<AnchorPositionedState>, WeakPtrImplWithEventTargetData>;
// https://drafts.csswg.org/css-anchor-position-1/#position-try-order-property
enum class PositionTryOrder : uint8_t {
Normal,
MostWidth,
MostHeight,
MostBlockSize,
MostInlineSize
};
WTF::TextStream& operator<<(WTF::TextStream&, PositionTryOrder);
class AnchorPositionEvaluator {
public:
// Find the anchor element indicated by `elementName` and update the associated anchor resolution data.
// Returns nullptr if the anchor element can't be found.
static RefPtr<Element> findAnchorForAnchorFunctionAndAttemptResolution(const BuilderState&, std::optional<ScopedName> elementName);
using Side = std::variant<CSSValueID, double>;
static bool propertyAllowsAnchorFunction(CSSPropertyID);
static std::optional<double> evaluate(const BuilderState&, std::optional<ScopedName> elementName, Side);
static bool propertyAllowsAnchorSizeFunction(CSSPropertyID);
static std::optional<double> evaluateSize(const BuilderState&, std::optional<ScopedName> elementName, std::optional<AnchorSizeDimension>);
static void updateAnchorPositioningStatesAfterInterleavedLayout(const Document&);
static void cleanupAnchorPositionedState(Element&);
static void updateSnapshottedScrollOffsets(Document&);
static void updateAnchorPositionedStateForLayoutTimePositioned(Element&, const RenderStyle&);
static LayoutRect computeAnchorRectRelativeToContainingBlock(CheckedRef<const RenderBoxModelObject> anchorBox, const RenderBlock& containingBlock);
using AnchorToAnchorPositionedMap = SingleThreadWeakHashMap<const RenderBoxModelObject, Vector<Ref<Element>>>;
static AnchorToAnchorPositionedMap makeAnchorPositionedForAnchorMap(Document&);
static bool isLayoutTimeAnchorPositioned(const RenderStyle&);
static CSSPropertyID resolvePositionTryFallbackProperty(CSSPropertyID, WritingMode, const PositionTryFallback&);
static bool overflowsContainingBlock(const RenderBox& anchoredBox);
private:
static AnchorElements findAnchorsForAnchorPositionedElement(const Element&, const UncheckedKeyHashSet<AtomString>& anchorNames, const AnchorsForAnchorName&);
};
} // namespace Style
} // namespace WebCore
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