| // 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. |
| |
| #include "cobalt/cssom/media_list.h" |
| |
| #include <limits> |
| |
| #include "base/logging.h" |
| #include "cobalt/cssom/css_parser.h" |
| #include "cobalt/cssom/length_value.h" |
| #include "cobalt/cssom/media_query.h" |
| #include "cobalt/cssom/property_value.h" |
| #include "cobalt/cssom/viewport_size.h" |
| |
| namespace cobalt { |
| namespace cssom { |
| |
| MediaList::MediaList() : css_parser_(NULL) {} |
| |
| MediaList::MediaList(CSSParser* css_parser) : css_parser_(css_parser) {} |
| |
| std::string MediaList::media_text() const { |
| std::string media; |
| size_t mediaitem = 0; |
| while (true) { |
| media += media_queries_[mediaitem]->media_query(); |
| if (++mediaitem < media_queries_.size()) |
| media += ", "; |
| else |
| break; |
| } |
| return media; |
| } |
| |
| void MediaList::set_media_text(const std::string& css_text) { |
| DCHECK(css_parser_); |
| scoped_refptr<MediaList> media_list = |
| css_parser_->ParseMediaList(css_text, GetInlineSourceLocation()); |
| |
| media_queries_.swap(media_list->media_queries_); |
| } |
| |
| // Returns the number of MediaQuery objects represented by the collection. |
| unsigned int MediaList::length() const { |
| CHECK_LE(media_queries_.size(), std::numeric_limits<unsigned int>::max()); |
| return static_cast<unsigned int>(media_queries_.size()); |
| } |
| |
| std::string MediaList::Item(unsigned int index) const { |
| return index < media_queries_.size() ? media_queries_[index]->media_query() |
| : ""; |
| } |
| |
| // Inserts a new media query string into the current style sheet. This Web API |
| // takes a string as input and parses it into a MediaQuery. |
| void MediaList::AppendMedium(const std::string& medium) { |
| DCHECK(css_parser_); |
| scoped_refptr<MediaQuery> media_query = |
| css_parser_->ParseMediaQuery(medium, GetInlineSourceLocation()); |
| |
| // TODO: Don't add the query if the same one already exists in the |
| // collection. See https://www.w3.org/TR/cssom/#medialist for details. |
| media_queries_.push_back(media_query); |
| } |
| |
| void MediaList::Append(const scoped_refptr<MediaQuery>& media_query) { |
| media_queries_.push_back(media_query); |
| } |
| |
| bool MediaList::EvaluateConditionValue(const ViewportSize& viewport_size) { |
| if (media_queries_.empty()) { |
| // A CSSMediaRule with no expressions always evaluates to true. |
| return true; |
| } |
| |
| for (MediaQueries::iterator it = media_queries_.begin(); |
| it != media_queries_.end(); ++it) { |
| if ((*it)->EvaluateConditionValue(viewport_size)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| void MediaList::TraceMembers(script::Tracer* tracer) { |
| tracer->TraceItems(media_queries_); |
| } |
| |
| MediaList::~MediaList() {} |
| |
| } // namespace cssom |
| } // namespace cobalt |