Method getElementStyles

src/eepp/ui/css/stylesheet.cpp:231–280

This is based on the RmlUi implementation.

// This is based on the RmlUi implementation.
std::shared_ptr<ElementDefinition> StyleSheet::getElementStyles( UIWidget* element,
																 const bool& applyPseudo ) const {
	static StyleSheetStyleVector applicableNodes;
	applicableNodes.clear();

	const std::string& tag = element->getElementTag();
	const std::string& id = element->getId();

	std::array<size_t, 4> nodeHash;
	int numHashes = 2;

	nodeHash[0] = 0;
	nodeHash[1] = this->nodeHash( tag, "" );

	if ( !id.empty() ) {
		numHashes = 4;
		nodeHash[2] = this->nodeHash( "", id );
		nodeHash[3] = this->nodeHash( tag, id );
	}

	for ( int i = 0; i < numHashes; i++ ) {
		auto itNodes = mNodeIndex.find( nodeHash[i] );
		if ( itNodes != mNodeIndex.end() ) {
			const StyleSheetStyleVector& nodes = itNodes->second;
			for ( StyleSheetStyle* node : nodes ) {
				if ( node->isMediaValid() && node->getSelector().select( element, applyPseudo ) ) {
					applicableNodes.push_back( node );
				}
			}
		}
	}

	std::sort( applicableNodes.begin(), applicableNodes.end(), StyleSheetNodeSort );

	if ( applicableNodes.empty() )
		return nullptr;

	size_t seed = 0;
	for ( const StyleSheetStyle* node : applicableNodes )
		HashCombine( seed, node );

	auto cacheIterator = mNodeCache.find( seed );
	if ( cacheIterator != mNodeCache.end() )
		return cacheIterator->second;

	auto newDefinition = std::make_shared<ElementDefinition>( applicableNodes );
	mNodeCache[seed] = newDefinition;

	return newDefinition;
}

const std::vector<std::shared_ptr<StyleSheetStyle>>& StyleSheet::getStyles() const {
	return mNodes;