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// Copyright 2018 the Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_CSS_CSSOM_PREPOPULATED_COMPUTED_STYLE_PROPERTY_MAP_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_CSS_CSSOM_PREPOPULATED_COMPUTED_STYLE_PROPERTY_MAP_H_
#include "third_party/blink/renderer/core/css/css_property_id_templates.h"
#include "third_party/blink/renderer/core/css/cssom/style_property_map_read_only_main_thread.h"
#include "third_party/blink/renderer/platform/wtf/text/atomic_string_hash.h"
namespace blink {
class ComputedStyle;
// This class has the same behaviour as the ComputedStylePropertyMap, except it
// only contains the properties given to the constructor.
//
// It is to be used with the Houdini APIs (css-paint-api, css-layout-api) which
// require style maps with a subset of properties.
//
// It will pre-populate internal maps (property->CSSValue), as the above APIs
// have a high probability of querying the values inside the map, however as a
// result when the ComputedStyle changes UpdateStyle needs to be called to
// re-populate the internal maps.
class CORE_EXPORT PrepopulatedComputedStylePropertyMap
: public StylePropertyMapReadOnlyMainThread {
public:
// NOTE: styled_node may be null, in the case where this map is for an
// anonymous box.
PrepopulatedComputedStylePropertyMap(
const Document&,
const ComputedStyle&,
const Vector<CSSPropertyID>& native_properties,
const Vector<AtomicString>& custom_properties);
PrepopulatedComputedStylePropertyMap(
const PrepopulatedComputedStylePropertyMap&) = delete;
PrepopulatedComputedStylePropertyMap& operator=(
const PrepopulatedComputedStylePropertyMap&) = delete;
// Updates the values of the properties based on the new computed style.
void UpdateStyle(const Document&, const ComputedStyle&);
unsigned size() const override;
void Trace(Visitor*) const override;
protected:
const CSSValue* GetProperty(CSSPropertyID) const override;
const CSSValue* GetCustomProperty(AtomicString) const override;
void ForEachProperty(const IterationCallback&) override;
String SerializationForShorthand(const CSSProperty&) const override;
private:
void UpdateNativeProperty(const ComputedStyle&, CSSPropertyID);
void UpdateCustomProperty(const Document&,
const ComputedStyle&,
const AtomicString& property_name);
HeapHashMap<CSSPropertyID, Member<const CSSValue>> native_values_;
HeapHashMap<AtomicString, Member<const CSSValue>> custom_values_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_CSS_CSSOM_PREPOPULATED_COMPUTED_STYLE_PROPERTY_MAP_H_
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