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/*
* Copyright 2014 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_LENGTH_VALUE_H_
#define COBALT_CSSOM_LENGTH_VALUE_H_
#include <string>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "cobalt/base/polymorphic_equatable.h"
#include "cobalt/cssom/property_value.h"
namespace cobalt {
namespace cssom {
// TODO: Add more units.
// When adding a unit, please add the name in kUnitNames im length_value.cc.
enum LengthUnit {
kPixelsUnit,
kAbsoluteUnitMax =
kPixelsUnit, // The units above are absolute, the rest are relative.
kFontSizesAkaEmUnit,
kRootElementFontSizesAkaRemUnit,
kViewportWidthPercentsAkaVwUnit,
kViewportHeightPercentsAkaVhUnit,
};
// Represents distance or size.
// Applies to properties such as left, width, font-size, etc.
// See https://www.w3.org/TR/css3-values/#lengths for details.
class LengthValue : public PropertyValue {
public:
LengthValue(float value, LengthUnit unit) : value_(value), unit_(unit) {}
void Accept(PropertyValueVisitor* visitor) OVERRIDE;
float value() const { return value_; }
LengthUnit unit() const { return unit_; }
bool IsUnitRelative() const { return unit_ > kAbsoluteUnitMax; }
std::string ToString() const OVERRIDE;
bool operator==(const LengthValue& other) const {
return value_ == other.value_ && unit_ == other.unit_;
}
bool operator>=(const LengthValue& other) const {
DCHECK_EQ(unit_, other.unit_) << "Value larger comparison of length values "
"can only be done for matching unit types";
return value_ >= other.value_;
}
bool operator<=(const LengthValue& other) const {
DCHECK_EQ(unit_, other.unit_) << "Value smaller comparison of length "
"values can only be done for matching "
"unit types";
return value_ <= other.value_;
}
DEFINE_POLYMORPHIC_EQUATABLE_TYPE(LengthValue);
private:
~LengthValue() OVERRIDE {}
const float value_;
const LengthUnit unit_;
DISALLOW_COPY_AND_ASSIGN(LengthValue);
};
} // namespace cssom
} // namespace cobalt
#endif // COBALT_CSSOM_LENGTH_VALUE_H_