| // 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_ |