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// Copyright 2015 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_ANIMATION_PROPERTY_HANDLE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_PROPERTY_HANDLE_H_
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/css/css_property_name.h"
#include "third_party/blink/renderer/core/css/css_property_names.h"
#include "third_party/blink/renderer/core/css/properties/css_property.h"
#include "third_party/blink/renderer/core/dom/qualified_name.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
namespace blink {
// Represents the property of a PropertySpecificKeyframe.
class CORE_EXPORT PropertyHandle {
DISALLOW_NEW();
public:
explicit PropertyHandle(const CSSProperty& property,
bool is_presentation_attribute = false)
: handle_type_(is_presentation_attribute ? kHandlePresentationAttribute
: kHandleCSSProperty),
css_property_(&property) {
DCHECK_NE(CSSPropertyID::kVariable, property.PropertyID());
}
explicit PropertyHandle(const AtomicString& property_name)
: handle_type_(kHandleCSSCustomProperty),
css_property_(&GetCSSPropertyVariable()),
property_name_(property_name) {}
explicit PropertyHandle(const QualifiedName& attribute_name)
: handle_type_(kHandleSVGAttribute), svg_attribute_(&attribute_name) {}
bool operator==(const PropertyHandle&) const;
bool operator!=(const PropertyHandle& other) const {
return !(*this == other);
}
unsigned GetHash() const;
bool IsCSSProperty() const {
return handle_type_ == kHandleCSSProperty || IsCSSCustomProperty();
}
const CSSProperty& GetCSSProperty() const {
DCHECK(IsCSSProperty());
return *css_property_;
}
bool IsCSSCustomProperty() const {
return handle_type_ == kHandleCSSCustomProperty;
}
const AtomicString& CustomPropertyName() const {
DCHECK(IsCSSCustomProperty());
return property_name_;
}
bool IsPresentationAttribute() const {
return handle_type_ == kHandlePresentationAttribute;
}
const CSSProperty& PresentationAttribute() const {
DCHECK(IsPresentationAttribute());
return *css_property_;
}
bool IsSVGAttribute() const { return handle_type_ == kHandleSVGAttribute; }
const QualifiedName& SvgAttribute() const {
DCHECK(IsSVGAttribute());
return *svg_attribute_;
}
CSSPropertyName GetCSSPropertyName() const {
if (handle_type_ == kHandleCSSCustomProperty)
return CSSPropertyName(property_name_);
DCHECK(IsCSSProperty() || IsPresentationAttribute());
return CSSPropertyName(css_property_->PropertyID());
}
private:
enum HandleType {
kHandleEmptyValueForHashTraits,
kHandleDeletedValueForHashTraits,
kHandleCSSProperty,
kHandleCSSCustomProperty,
kHandlePresentationAttribute,
kHandleSVGAttribute,
};
explicit PropertyHandle(HandleType handle_type)
: handle_type_(handle_type), svg_attribute_(nullptr) {}
static PropertyHandle EmptyValueForHashTraits() {
return PropertyHandle(kHandleEmptyValueForHashTraits);
}
static PropertyHandle DeletedValueForHashTraits() {
return PropertyHandle(kHandleDeletedValueForHashTraits);
}
bool IsDeletedValueForHashTraits() const {
return handle_type_ == kHandleDeletedValueForHashTraits;
}
HandleType handle_type_;
union {
const CSSProperty* css_property_;
const QualifiedName* svg_attribute_;
};
AtomicString property_name_;
friend struct ::WTF::HashTraits<blink::PropertyHandle>;
};
} // namespace blink
namespace WTF {
template <>
struct DefaultHash<blink::PropertyHandle> {
struct Hash {
STATIC_ONLY(Hash);
static unsigned GetHash(const blink::PropertyHandle& handle) {
return handle.GetHash();
}
static bool Equal(const blink::PropertyHandle& a,
const blink::PropertyHandle& b) {
return a == b;
}
static const bool safe_to_compare_to_empty_or_deleted = true;
};
};
template <>
struct HashTraits<blink::PropertyHandle>
: SimpleClassHashTraits<blink::PropertyHandle> {
static const bool kNeedsDestruction = true;
static void ConstructDeletedValue(blink::PropertyHandle& slot, bool) {
new (NotNull, &slot) blink::PropertyHandle(
blink::PropertyHandle::DeletedValueForHashTraits());
}
static bool IsDeletedValue(const blink::PropertyHandle& value) {
return value.IsDeletedValueForHashTraits();
}
static blink::PropertyHandle EmptyValue() {
return blink::PropertyHandle::EmptyValueForHashTraits();
}
};
} // namespace WTF
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_PROPERTY_HANDLE_H_
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