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See the\n// GNU General Public License for more details.\n//\n// You should have received a copy of the GNU General Public License\n// along with Moodle. If not, see <http://www.gnu.org/licenses/>.\n\n/**\n * Prefetch module to help lazily load content for use on the current page.\n *\n * @module core/prefetch\n * @class prefetch\n * @package core\n * @copyright 2020 Andrew Nicols <andrew@nicols.co.uk>\n * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n */\nimport Config from 'core/config';\n\n// Keep track of whether the initial prefetch has occurred.\nlet initialPrefetchComplete = false;\n\n// Prefetch templates.\nlet templateList = [];\n\n// Prefetch strings.\nlet stringList = {};\n\nlet prefetchTimer;\n\n/**\n * Fetch all queued items in the queue.\n *\n * Should only be called via processQueue.\n */\nconst fetchQueue = () => {\n // Prefetch templates.\n if (templateList) {\n const templatesToLoad = templateList.slice();\n templateList = [];\n import('core/templates')\n .then(Templates => Templates.prefetchTemplates(templatesToLoad))\n .catch();\n }\n\n // Prefetch strings.\n const mappedStringsToFetch = stringList;\n stringList = {};\n\n const stringsToFetch = [];\n Object.keys(mappedStringsToFetch).forEach(component => {\n stringsToFetch.push(...mappedStringsToFetch[component].map(key => {\n return {component, key};\n }));\n });\n\n if (stringsToFetch) {\n import('core/str')\n .then(Str => Str.get_strings(stringsToFetch))\n .catch();\n }\n};\n\n/**\n * Process the prefetch queues as required.\n *\n * The initial call will queue the first fetch after a delay.\n * Subsequent fetches are immediate.\n */\nconst processQueue = () => {\n if (prefetchTimer) {\n // There is a live prefetch timer. The initial prefetch has been scheduled but is not complete.\n return;\n }\n\n // The initial prefetch has compelted. Just queue as normal.\n if (initialPrefetchComplete) {\n fetchQueue();\n\n return;\n }\n\n // Queue the initial prefetch in a short while.\n prefetchTimer = setTimeout(() => {\n initialPrefetchComplete = true;\n prefetchTimer = null;\n\n // Ensure that the icon system is loaded.\n // This can be quite slow and delay UI interactions if it is loaded on demand.\n import(Config.iconsystemmodule)\n .then(IconSystem => {\n const iconSystem = new IconSystem();\n prefetchTemplate(iconSystem.getTemplateName());\n\n return iconSystem;\n })\n .then(iconSystem => {\n fetchQueue();\n iconSystem.init();\n\n return;\n })\n .catch();\n }, 500);\n};\n\n/**\n * Add a set of templates to the prefetch queue.\n *\n * @param {Array} templatesNames\n */\nconst prefetchTemplates = templatesNames => {\n templateList = templateList.concat(templatesNames);\n\n processQueue();\n};\n\n/**\n * Add a single template to the prefetch queue.\n *\n * @param {String} templateName\n * @returns {undefined}\n */\nconst prefetchTemplate = templateName => prefetchTemplates([templateName]);\n\n/**\n * Add a set of strings from the same component to the prefetch queue.\n *\n * @param {String} component\n * @param {String[]} keys\n */\nconst prefetchStrings = (component, keys) => {\n if (!stringList[component]) {\n stringList[component] = [];\n }\n\n stringList[component] = stringList[component].concat(keys);\n\n processQueue();\n};\n\n/**\n * Add a single string to the prefetch queue.\n *\n * @param {String} component\n * @param {String} key\n */\nconst prefetchString = (component, key) => {\n if (!stringList[component]) {\n stringList[component] = [];\n }\n\n stringList[component].push(key);\n\n processQueue();\n};\n\n// Prefetch some commonly-used templates.\nprefetchTemplates([].concat(\n ['core/loading'],\n ['core/modal'],\n ['core/modal_backdrop'],\n));\n\n// And some commonly used strings.\nprefetchStrings('core', [\n 'cancel',\n 'closebuttontitle',\n 'loading',\n 'savechanges',\n]);\nprefetchStrings('core_form', [\n 'showless',\n 'showmore',\n]);\n\nexport default {\n prefetchTemplate,\n prefetchTemplates,\n prefetchString,\n prefetchStrings,\n};\n"],"file":"prefetch.min.js"}