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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_MEDIA_FEATURE_KEYWORD_VALUE_H_
#define COBALT_CSSOM_MEDIA_FEATURE_KEYWORD_VALUE_H_
#include <string>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/ref_counted.h"
#include "cobalt/base/polymorphic_equatable.h"
#include "cobalt/cssom/property_value.h"
namespace cobalt {
namespace cssom {
class PropertyValueVisitor;
class MediaFeatureKeywordValue : public PropertyValue {
public:
enum Value {
// "interlace" is a value of the "scan" media feature which indicates that
// the display is interlaced.
// https://www.w3.org/TR/css3-mediaqueries/#scan
kInterlace,
// "landscape" is a value of the "orientation" media feature which indicates
// that the display is oriented in landscape mode.
// https://www.w3.org/TR/css3-mediaqueries/#orientation
kLandscape,
// "portrait" is a value of the "orientation" media feature which indicates
// that the display is oriented in portrait mode.
// https://www.w3.org/TR/css3-mediaqueries/#orientation
kPortrait,
// "progressive" is a value of the "scan" media feature which indicates that
// the display is progressive (not interlaced).
// https://www.w3.org/TR/css3-mediaqueries/#scan
kProgressive,
};
// Since keyword values do not hold additional information and some of them
// (namely "inherit" and "initial") are used extensively, for the sake of
// saving memory an explicit instantiation of this class is disallowed.
// Use factory methods below to obtain shared instances.
static const scoped_refptr<MediaFeatureKeywordValue>& GetInterlace();
static const scoped_refptr<MediaFeatureKeywordValue>& GetLandscape();
static const scoped_refptr<MediaFeatureKeywordValue>& GetPortrait();
static const scoped_refptr<MediaFeatureKeywordValue>& GetProgressive();
void Accept(PropertyValueVisitor* visitor) override;
Value value() const { return value_; }
std::string ToString() const override;
bool operator==(const MediaFeatureKeywordValue& other) const {
return value_ == other.value_;
}
DEFINE_POLYMORPHIC_EQUATABLE_TYPE(MediaFeatureKeywordValue);
// Implementation detail, has to be public in order to be constructible.
struct NonTrivialStaticFields;
private:
explicit MediaFeatureKeywordValue(Value value) : value_(value) {}
~MediaFeatureKeywordValue() override {}
const Value value_;
DISALLOW_COPY_AND_ASSIGN(MediaFeatureKeywordValue);
};
} // namespace cssom
} // namespace cobalt
#endif // COBALT_CSSOM_MEDIA_FEATURE_KEYWORD_VALUE_H_