| // Copyright 2019 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_USED_STYLE_H_ |
| #define COBALT_CSSOM_USED_STYLE_H_ |
| |
| #include "base/optional.h" |
| #include "cobalt/cssom/calc_value.h" |
| #include "cobalt/cssom/length_value.h" |
| #include "cobalt/cssom/percentage_value.h" |
| #include "cobalt/cssom/property_value_visitor.h" |
| #include "cobalt/layout/layout_unit.h" |
| |
| namespace cobalt { |
| namespace cssom { |
| |
| template <typename LengthType> |
| class UsedLengthValueProvider : public NotReachedPropertyValueVisitor { |
| public: |
| explicit UsedLengthValueProvider(LengthType percentage_base, |
| bool calc_permitted = false) |
| : percentage_base_(percentage_base), calc_permitted_(calc_permitted) {} |
| |
| void VisitLength(LengthValue* length) { |
| depends_on_containing_block_ = false; |
| |
| DCHECK_EQ(kPixelsUnit, length->unit()); |
| used_length_ = LengthType(length->value()); |
| } |
| |
| void VisitPercentage(PercentageValue* percentage) { |
| depends_on_containing_block_ = true; |
| used_length_ = percentage->value() * percentage_base_; |
| } |
| |
| void VisitCalc(CalcValue* calc) { |
| if (!calc_permitted_) { |
| NOTREACHED(); |
| } |
| depends_on_containing_block_ = true; |
| used_length_ = LengthType(calc->length_value()->value()) + |
| calc->percentage_value()->value() * percentage_base_; |
| } |
| |
| bool depends_on_containing_block() const { |
| return depends_on_containing_block_; |
| } |
| |
| const base::Optional<LengthType>& used_length() const { return used_length_; } |
| |
| protected: |
| bool depends_on_containing_block_; |
| |
| private: |
| const LengthType percentage_base_; |
| const bool calc_permitted_; |
| |
| base::Optional<LengthType> used_length_; |
| |
| DISALLOW_COPY_AND_ASSIGN(UsedLengthValueProvider); |
| }; |
| |
| } // namespace cssom |
| } // namespace cobalt |
| |
| #endif // COBALT_CSSOM_USED_STYLE_H_ |