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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_CSS_MEDIA_RULE_H_
#define COBALT_CSSOM_CSS_MEDIA_RULE_H_
#include <string>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/ref_counted.h"
#include "cobalt/cssom/css_condition_rule.h"
#include "cobalt/cssom/viewport_size.h"
#include "cobalt/math/size.h"
#include "cobalt/script/wrappable.h"
namespace cobalt {
namespace cssom {
class CSSRuleList;
class CSSRuleVisitor;
class CSSStyleSheet;
class MediaList;
class PropertyValue;
// The CSSMediaRule interface represents an @media at-rule.
// https://www.w3.org/TR/cssom/#the-cssmediarule-interface
class CSSMediaRule : public CSSConditionRule {
public:
CSSMediaRule(const scoped_refptr<MediaList>& media_list,
const scoped_refptr<CSSRuleList>& css_rule_list);
// Web API: CSSRule
Type type() const override { return kMediaRule; }
std::string css_text(script::ExceptionState* exception_state) const override;
void set_css_text(const std::string& css_text,
script::ExceptionState* exception_state) override;
// Web API: CSSConditionRule
std::string condition_text() override;
void set_condition_text(const std::string& condition) override;
// Web API: CSSMediaRule
//
// Returns a read-only, live object representing the CSS rules.
const scoped_refptr<MediaList>& media() const;
// Custom, not in any spec.
//
// From CSSRule.
void Accept(CSSRuleVisitor* visitor) override;
// Evaluates the condition expression and caches the resulting condition
// value. Returns true if the cached condition value has changed.
bool EvaluateConditionValueAndReturnIfChanged(
const ViewportSize& viewport_size);
// This method can be used to setup the parent style sheet.
void AttachToCSSStyleSheet(CSSStyleSheet* style_sheet) override;
CSSMediaRule* AsCSSMediaRule() override { return this; }
DEFINE_WRAPPABLE_TYPE(CSSMediaRule);
private:
~CSSMediaRule() override;
scoped_refptr<MediaList> media_list_;
DISALLOW_COPY_AND_ASSIGN(CSSMediaRule);
};
} // namespace cssom
} // namespace cobalt
#endif // COBALT_CSSOM_CSS_MEDIA_RULE_H_