| // 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. |
| |
| #include "cobalt/cssom/css_style_sheet.h" |
| |
| #include "cobalt/cssom/css_condition_rule.h" |
| #include "cobalt/cssom/css_font_face_rule.h" |
| #include "cobalt/cssom/css_grouping_rule.h" |
| #include "cobalt/cssom/css_media_rule.h" |
| #include "cobalt/cssom/css_parser.h" |
| #include "cobalt/cssom/css_rule_list.h" |
| #include "cobalt/cssom/css_rule_visitor.h" |
| #include "cobalt/cssom/css_style_declaration.h" |
| #include "cobalt/cssom/css_style_rule.h" |
| #include "cobalt/cssom/style_sheet_list.h" |
| #include "cobalt/dom/dom_exception.h" |
| |
| namespace cobalt { |
| namespace cssom { |
| namespace { |
| |
| ////////////////////////////////////////////////////////////////////////// |
| // MediaRuleUpdater |
| ////////////////////////////////////////////////////////////////////////// |
| |
| class MediaRuleUpdater : public CSSRuleVisitor { |
| public: |
| explicit MediaRuleUpdater(const math::Size& viewport_size) |
| : any_condition_value_changed_(false), viewport_size_(viewport_size) {} |
| |
| void VisitCSSStyleRule(CSSStyleRule* /*css_style_rule*/) override {} |
| |
| void VisitCSSFontFaceRule(CSSFontFaceRule* /*css_font_face_rule*/) override {} |
| |
| void VisitCSSMediaRule(CSSMediaRule* css_media_rule) override { |
| bool condition_value_changed = |
| css_media_rule->EvaluateConditionValueAndReturnIfChanged( |
| viewport_size_); |
| any_condition_value_changed_ |= condition_value_changed; |
| } |
| |
| void VisitCSSKeyframeRule(CSSKeyframeRule* /*css_keyframe_rule*/) override {} |
| void VisitCSSKeyframesRule( |
| CSSKeyframesRule* /*css_keyframes_rule*/) override {} |
| |
| bool AnyConditionValueChanged() { return any_condition_value_changed_; } |
| |
| private: |
| bool any_condition_value_changed_; |
| math::Size viewport_size_; |
| |
| DISALLOW_COPY_AND_ASSIGN(MediaRuleUpdater); |
| }; |
| |
| } // namespace |
| |
| ////////////////////////////////////////////////////////////////////////// |
| // CSSStyleSheet |
| ////////////////////////////////////////////////////////////////////////// |
| |
| CSSStyleSheet::CSSStyleSheet() |
| : parent_style_sheet_list_(NULL), |
| css_parser_(NULL), |
| media_rules_changed_(false), |
| origin_(kNormalAuthor), |
| origin_clean_(false) {} |
| |
| CSSStyleSheet::CSSStyleSheet(CSSParser* css_parser) |
| : parent_style_sheet_list_(NULL), |
| css_parser_(css_parser), |
| media_rules_changed_(false), |
| origin_(kNormalAuthor), |
| origin_clean_(false) {} |
| |
| // https://drafts.csswg.org/cssom/#dom-cssstylesheet-cssrules |
| const scoped_refptr<CSSRuleList>& CSSStyleSheet::css_rules( |
| script::ExceptionState* exception_state) { |
| if (!origin_clean_) { |
| dom::DOMException::Raise( |
| dom::DOMException::kSecurityErr, |
| "Website trys to access css rules from a CSSStyleSheet " |
| "fetched from another origin.", |
| exception_state); |
| DCHECK(!null_css_rule_list_); |
| return null_css_rule_list_; |
| } |
| return css_rules_same_origin(); |
| } |
| |
| const scoped_refptr<CSSRuleList>& CSSStyleSheet::css_rules_same_origin() { |
| if (!css_rule_list_) { |
| set_css_rules(new CSSRuleList()); |
| } |
| DCHECK(css_rule_list_); |
| return css_rule_list_; |
| } |
| |
| // https://drafts.csswg.org/cssom/#dom-cssstylesheet-insertrule |
| unsigned int CSSStyleSheet::InsertRule( |
| const std::string& rule, unsigned int index, |
| script::ExceptionState* exception_state) { |
| if (!origin_clean_) { |
| dom::DOMException::Raise( |
| dom::DOMException::kSecurityErr, |
| "Website trys to insert css rule to a CSSStyleSheet fetched" |
| "from another origin.", |
| exception_state); |
| return 0; |
| } |
| return css_rules_same_origin()->InsertRule(rule, index); |
| } |
| |
| unsigned int CSSStyleSheet::InsertRuleSameOrigin(const std::string& rule, |
| unsigned int index) { |
| return css_rules_same_origin()->InsertRule(rule, index); |
| } |
| |
| void CSSStyleSheet::OnCSSMutation() { |
| if (parent_style_sheet_list_) { |
| parent_style_sheet_list_->OnCSSMutation(); |
| } |
| } |
| |
| void CSSStyleSheet::AttachToStyleSheetList(StyleSheetList* style_sheet_list) { |
| parent_style_sheet_list_ = style_sheet_list; |
| } |
| |
| void CSSStyleSheet::DetachFromStyleSheetList() { |
| parent_style_sheet_list_ = NULL; |
| } |
| |
| void CSSStyleSheet::set_css_rules( |
| const scoped_refptr<CSSRuleList>& css_rule_list) { |
| DCHECK(css_rule_list); |
| if (css_rule_list == css_rule_list_) { |
| return; |
| } |
| css_rule_list->AttachToCSSStyleSheet(this); |
| bool rules_possibly_added_or_changed_or_removed = |
| (css_rule_list->length() > 0) || |
| (css_rule_list_ && css_rule_list_->length() > 0); |
| css_rule_list_ = css_rule_list; |
| if (rules_possibly_added_or_changed_or_removed) { |
| OnCSSMutation(); |
| } |
| } |
| |
| void CSSStyleSheet::EvaluateMediaRules(const math::Size& viewport_size) { |
| // If the media rules change, we have to do an update. |
| bool should_update_media_rules = media_rules_changed_; |
| media_rules_changed_ = false; |
| |
| if (!css_rule_list_) { |
| return; |
| } |
| |
| // If the media parameters change, we have to do an update. |
| if (!should_update_media_rules) { |
| if (!previous_media_viewport_size_ || |
| viewport_size != *previous_media_viewport_size_) { |
| should_update_media_rules = true; |
| } |
| } |
| |
| if (should_update_media_rules) { |
| // Evaluate the media rule conditions, and signal a css mutation if any |
| // condition values have changed. |
| MediaRuleUpdater media_rule_updater(viewport_size); |
| css_rule_list_->Accept(&media_rule_updater); |
| if (media_rule_updater.AnyConditionValueChanged()) { |
| OnCSSMutation(); |
| } |
| previous_media_viewport_size_ = viewport_size; |
| } |
| } |
| |
| CSSStyleSheet::~CSSStyleSheet() {} |
| |
| } // namespace cssom |
| } // namespace cobalt |