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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_CONDITION_RULE_H_
#define COBALT_CSSOM_CSS_CONDITION_RULE_H_
#include <string>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/ref_counted.h"
#include "cobalt/cssom/css_grouping_rule.h"
#include "cobalt/script/wrappable.h"
namespace cobalt {
namespace cssom {
class CSSRuleList;
class CSSRuleVisitor;
// The CSSConditionRule interface represents all the "conditional" at-rules,
// which consist of a condition and a statement block.
// https://www.w3.org/TR/css3-conditional/#cssconditionrule
class CSSConditionRule : public CSSGroupingRule {
public:
// Web API: CSSConditionRule
virtual std::string condition_text() = 0;
virtual void set_condition_text(const std::string& condition) = 0;
// Custom, not in any spec.
//
// From CSSRule.
void Accept(CSSRuleVisitor* visitor) override {
NOTREACHED();
}
// Returns the cached result of evaluating the condition.
bool condition_value() { return cached_condition_value_; }
// Sets the cached condition value, returns true if the value has changed,
// false if not.
bool SetConditionValueAndTestIfChanged(bool cached_condition_value);
DEFINE_WRAPPABLE_TYPE(CSSConditionRule);
protected:
explicit CSSConditionRule(const scoped_refptr<CSSRuleList>& css_rule_list);
~CSSConditionRule() override {}
private:
bool cached_condition_value_;
DISALLOW_COPY_AND_ASSIGN(CSSConditionRule);
};
} // namespace cssom
} // namespace cobalt
#endif // COBALT_CSSOM_CSS_CONDITION_RULE_H_