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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_RATIO_VALUE_H_
#define COBALT_CSSOM_RATIO_VALUE_H_
#include <string>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "base/stringprintf.h"
#include "cobalt/base/polymorphic_equatable.h"
#include "cobalt/cssom/property_value.h"
#include "cobalt/math/rational.h"
namespace cobalt {
namespace cssom {
class PropertyValueVisitor;
// Represents a ratio value.
// https://www.w3.org/TR/css3-mediaqueries/#values
// Applies to aspect-ratio and device-aspect-ratio media feature.
// https://www.w3.org/TR/css3-mediaqueries/#aspect-ratio
class RatioValue : public PropertyValue {
public:
explicit RatioValue(const math::Rational& value) : value_(value) {
DCHECK_LE(1, value_.numerator());
DCHECK_LE(1, value_.denominator());
}
void Accept(PropertyValueVisitor* visitor) OVERRIDE;
const math::Rational& value() const { return value_; }
std::string ToString() const OVERRIDE {
return base::StringPrintf("%d/%d", value_.numerator(),
value_.denominator());
}
bool operator==(const RatioValue& other) const {
return value_ == other.value_;
}
DEFINE_POLYMORPHIC_EQUATABLE_TYPE(RatioValue);
private:
~RatioValue() OVERRIDE {}
const math::Rational value_;
DISALLOW_COPY_AND_ASSIGN(RatioValue);
};
} // namespace cssom
} // namespace cobalt
#endif // COBALT_CSSOM_RATIO_VALUE_H_