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// Copyright 2015 Google Inc. 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_LINEAR_GRADIENT_VALUE_H_
#define COBALT_CSSOM_LINEAR_GRADIENT_VALUE_H_
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/optional.h"
#include "cobalt/base/polymorphic_equatable.h"
#include "cobalt/cssom/color_stop.h"
#include "cobalt/cssom/property_value.h"
namespace cobalt {
namespace cssom {
// The angle or side_or_corner specifies the gradient line, which gives the
// gradient a direction and determines how color-stops are positioned.
// https://www.w3.org/TR/css3-images/#linear-gradients
class LinearGradientValue : public PropertyValue {
public:
enum SideOrCorner {
kBottom,
kBottomLeft,
kBottomRight,
kLeft,
kRight,
kTop,
kTopLeft,
kTopRight,
};
LinearGradientValue(float angle_in_radians, ColorStopList color_stop_list)
: angle_in_radians_(angle_in_radians),
color_stop_list_(color_stop_list.Pass()) {}
LinearGradientValue(SideOrCorner side_or_corner,
ColorStopList color_stop_list)
: side_or_corner_(side_or_corner),
color_stop_list_(color_stop_list.Pass()) {}
void Accept(PropertyValueVisitor* visitor) OVERRIDE;
const base::optional<float>& angle_in_radians() const {
return angle_in_radians_;
}
const base::optional<SideOrCorner>& side_or_corner() const {
return side_or_corner_;
}
const ColorStopList& color_stop_list() const { return color_stop_list_; }
std::string ToString() const OVERRIDE;
bool operator==(const LinearGradientValue& other) const;
DEFINE_POLYMORPHIC_EQUATABLE_TYPE(LinearGradientValue);
private:
~LinearGradientValue() OVERRIDE {}
// Exactly one of |angle_in_radians_| and |side_or_corner_| is engaged.
const base::optional<float> angle_in_radians_;
const base::optional<SideOrCorner> side_or_corner_;
const ColorStopList color_stop_list_;
DISALLOW_COPY_AND_ASSIGN(LinearGradientValue);
};
} // namespace cssom
} // namespace cobalt
#endif // COBALT_CSSOM_LINEAR_GRADIENT_VALUE_H_