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// Copyright 2015 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef COBALT_CSSOM_RADIAL_GRADIENT_VALUE_H_
#define COBALT_CSSOM_RADIAL_GRADIENT_VALUE_H_
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/ref_counted.h"
#include "base/optional.h"
#include "cobalt/base/polymorphic_equatable.h"
#include "cobalt/cssom/color_stop.h"
#include "cobalt/cssom/property_list_value.h"
#include "cobalt/cssom/property_value.h"
namespace cobalt {
namespace cssom {
// A radial gradient is specified by indicating the center of the gradient (
// where the 0% ellipse will be) and the size and shape of the ending shape (the
// 100% ellipse). Color stops are given as a list. Starting from the center and
// progressing towards (and potentially beyond) the ending shape
// uniformly-scaled concentric ellipses are drawn and colored according to the
// specified color stops.
// https://www.w3.org/TR/css3-images/#radial-gradients
class RadialGradientValue : public PropertyValue {
public:
enum Shape {
kCircle,
kEllipse,
};
enum SizeKeyword {
kClosestSide,
kFarthestSide,
kClosestCorner,
kFarthestCorner,
};
RadialGradientValue(Shape shape, SizeKeyword size_keyword,
const scoped_refptr<PropertyListValue>& position,
ColorStopList color_stop_list)
: shape_(shape),
size_keyword_(size_keyword),
size_value_(nullptr),
position_(position),
color_stop_list_(std::move(color_stop_list)) {}
RadialGradientValue(Shape shape,
const scoped_refptr<PropertyListValue>& size_value,
const scoped_refptr<PropertyListValue>& position,
ColorStopList color_stop_list)
: shape_(shape),
size_value_(size_value),
position_(position),
color_stop_list_(std::move(color_stop_list)) {}
void Accept(PropertyValueVisitor* visitor) override;
const Shape& shape() const { return shape_; }
base::Optional<SizeKeyword> size_keyword() const { return size_keyword_; }
const scoped_refptr<PropertyListValue>& size_value() const {
return size_value_;
}
const scoped_refptr<PropertyListValue>& position() const { return position_; }
const ColorStopList& color_stop_list() const {
return color_stop_list_;
}
std::string ToString() const override;
bool operator==(const RadialGradientValue& other) const;
DEFINE_POLYMORPHIC_EQUATABLE_TYPE(RadialGradientValue);
private:
~RadialGradientValue() override {}
const Shape shape_;
// Exactly one of |size_keyword_| and |size_value_| is engaged.
const base::Optional<SizeKeyword> size_keyword_;
const scoped_refptr<PropertyListValue> size_value_;
const scoped_refptr<PropertyListValue> position_;
const ColorStopList color_stop_list_;
DISALLOW_COPY_AND_ASSIGN(RadialGradientValue);
};
} // namespace cssom
} // namespace cobalt
#endif // COBALT_CSSOM_RADIAL_GRADIENT_VALUE_H_