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// Copyright 2016 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_COLOR_STOP_H_
#define COBALT_CSSOM_COLOR_STOP_H_
#include <memory>
#include <string>
#include "base/memory/ref_counted.h"
#include "cobalt/cssom/length_value.h"
#include "cobalt/cssom/percentage_value.h"
#include "cobalt/cssom/property_value.h"
#include "cobalt/cssom/rgba_color_value.h"
namespace cobalt {
namespace cssom {
// A color stop is a combination of a color and a position. Percentages refer to
// the length of the gradient line, with 0% being at the starting point and 100%
// being at the ending point. Lengths are measured from the starting point in
// the direction of the ending point.
// See https://www.w3.org/TR/css3-images/#color-stop-syntax
// 4.4. Gradient Color-Stops for details.
class ColorStop {
public:
explicit ColorStop(const scoped_refptr<RGBAColorValue>& rgba)
: rgba_(rgba), position_(NULL) {}
ColorStop(const scoped_refptr<RGBAColorValue>& rgba,
const scoped_refptr<PropertyValue>& position)
: rgba_(rgba), position_(position) {}
const scoped_refptr<RGBAColorValue>& rgba() const { return rgba_; }
const scoped_refptr<PropertyValue>& position() const { return position_; }
std::string ToString() const;
bool operator==(const ColorStop& other) const;
private:
const scoped_refptr<RGBAColorValue> rgba_;
const scoped_refptr<PropertyValue> position_;
DISALLOW_COPY_AND_ASSIGN(ColorStop);
};
// A list of ColorStopValue. Color-stops are points placed along the line
// defined by gradient line at the beginning of the rule. Color-stops must be
// specified in order.
typedef std::vector<std::unique_ptr<ColorStop>> ColorStopList;
bool ColorStopListsEqual(const ColorStopList& lhs, const ColorStopList& rhs);
} // namespace cssom
} // namespace cobalt
#endif // COBALT_CSSOM_COLOR_STOP_H_