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'use strict';
// Create a namespace.
var BlocklySimStorage = {};
BlocklySimStorage.STORAGE_URL = 'https://glowing-fire-4998.firebaseio.com';
BlocklySimStorage.LOCALSTORAGE_KEY = 'simulator';
BlocklySimStorage.isLinkUrl = function () {
var op = ['openModal', 'close'];
return window.location.hash.length > 1 && op.indexOf(window.location.hash.substring(1)) === -1;
};
/**
* Backup simulator config to localStorage.
* @param {Element} area - Dom Element
* @param {Element} frame - Dom Element
* @private
*/
BlocklySimStorage.backupBlocks_ = function (area, frame) {
if ('localStorage' in window) {
var storage = BlocklySimStorage.getConfig_(area, frame);
window.localStorage.setItem(BlocklySimStorage.LOCALSTORAGE_KEY, JSON.stringify(storage));
}
};
/**
* Get simulator config
* @param {element} area - DOM element
* @param {element} frame - DOM Element
* @return {object} storage - Simulator config
* @private
*/
BlocklySimStorage.getConfig_ = function (area, frame) {
var storage = {};
storage.config = frame.contentWindow.blockly.getConfig();
storage.opened = area.classList.contains('show');
storage.isFull = area.classList.contains('full');
storage.width = area.dataset.width;
storage.height = area.dataset.height;
return storage;
};
/**
* Save simulator config to localStorage when window unloaded.
* @param {element} area - DOM element
* @param {element} frame - DOM Element
*/
BlocklySimStorage.backupOnUnload = function (area, frame) {
window.addEventListener('unload',
function () {
if (!BlocklySimStorage.isLinkUrl()) {
BlocklySimStorage.backupBlocks_(area, frame);
}
}, false);
};
/**
* Set config to frame
* @param {element} area - DOM element
* @param {element} frame - DOM Element
* @param {element} toggleBtn - DOM element
* @param {object} storage - Simulator config
* @param {function} cb - callback function
* @private
*/
BlocklySimStorage.setConfig_ = function (area, frame, toggleBtn, storage, cb) {
if (!frame.contentWindow.blockly) {
frame.contentWindow.addEventListener('load', function aa() {
frame.contentWindow.removeEventListener('load', aa);
BlocklySimStorage.setConfig_(area, frame, toggleBtn, storage, cb);
});
return;
}
cb = cb || function() {};
var api = frame.contentWindow.blockly;
// 寬、高值儲存在元素屬性上，全畫面放大／縮小的依據
storage.width && (area.dataset.width = storage.width);
storage.height && (area.dataset.height = storage.height);
// 依 blockly 目前的語系
api.lang(Code.getLang());
// 設定 area 寬高
if (storage.isFull) {
area.classList.add('full');
} else {
storage.width && (area.style.width = storage.width);
storage.height && (area.style.height = storage.height);
}
// 設定 area 顯示/隱藏
if (storage.opened) {
area.classList.add('show');
toggleBtn.classList.add('opened');
} else {
area.classList.remove('show');
toggleBtn.classList.remove('opened');
}
// 之前存檔的回復
api.setConfig(storage.config, cb);
};
/**
* Restore simulator config from localStorage
* @param {Element} area - DOM Element
* @param {Element} frame - DOM Element
* @param {Element} toggleBtn - DOM Element
*/
BlocklySimStorage.restoreBlocks = function (area, frame, toggleBtn) {
if ('localStorage' in window && window.localStorage[BlocklySimStorage.LOCALSTORAGE_KEY]) {
var storage = JSON.parse(window.localStorage[BlocklySimStorage.LOCALSTORAGE_KEY]);
BlocklySimStorage.setConfig_(area, frame, toggleBtn, storage);
}
};
/**
* Save simulator config to database
* @param {Element} area - DOM element
* @param {element} frame - DOM Element
* @param {element} toggleBtn - DOM element
*/
BlocklySimStorage.link = function (area, frame, toggleBtn) {
window.addEventListener('hashchange', hashChange, false);
function hashChange() {
window.removeEventListener('hashchange', hashChange);
var key = window.location.hash.substring(1);
var data = JSON.stringify(BlocklySimStorage.getConfig_(area, frame));
var workInfo = {
area: area,
frame: frame,
toggleBtn: toggleBtn,
key: key
};
BlocklySimStorage.makeRequest_('/blockly', 'simulator', data, workInfo);
}
};
/**
* Retrieve Simulator text from database using given key.
* @param {string} key - Key to Simulator
* @param {Element} area - DOM element
* @param {element} frame - DOM Element
* @param {element} toggleBtn - DOM element
*/
BlocklySimStorage.retrieveXml = function (key, area, frame, toggleBtn) {
var workInfo = {
area: area,
frame: frame,
toggleBtn: toggleBtn
};
BlocklySimStorage.makeRequest_('/blockly', 'key', key, workInfo);
};
/**
* Global reference to current AJAX request.
* @type {XMLHttpRequest}
* @private
*/
BlocklySimStorage.httpRequest_ = null;
/**
* Fire a new AJAX request.
* @param {string} url - URL to fetch.
* @param {string} name - Name of parameter.
* @param {string} content - Content of parameter.
* @param {object} workInfo - {area, frame, toggleBtn}
* @private
*/
BlocklySimStorage.makeRequest_ = function (url, name, content, workInfo) {
BlocklySimStorage.httpRequest_ = new XMLHttpRequest();
BlocklySimStorage.httpRequest_.name = name;
BlocklySimStorage.httpRequest_.onreadystatechange =
BlocklySimStorage.handleRequest_;
switch (name) {
case 'simulator':
BlocklySimStorage.httpRequest_.open('PATCH',
BlocklySimStorage.STORAGE_URL + url + '/' + workInfo.key + '.json');
BlocklySimStorage.httpRequest_.setRequestHeader('Content-Type',
'application/x-www-form-urlencoded');
BlocklySimStorage.httpRequest_.send(JSON.stringify({
simulator: content
}));
break;
case 'key':
BlocklySimStorage.httpRequest_.open('GET',
BlocklySimStorage.STORAGE_URL + url + '/' + content + '.json');
BlocklySimStorage.httpRequest_.send();
break;
}
BlocklySimStorage.httpRequest_.workInfo = workInfo;
};
/**
* Callback function for AJAX call.
* @private
*/
BlocklySimStorage.handleRequest_ = function () {
if (BlocklySimStorage.httpRequest_.readyState == 4) {
if (BlocklySimStorage.httpRequest_.status != 200) {
BlocklySimStorage.alert(BlocklySimStorage.HTTPREQUEST_ERROR + '\n' +
'httpRequest_.status: ' + BlocklySimStorage.httpRequest_.status);
} else {
var data = BlocklySimStorage.httpRequest_.responseText.trim();
var workInfo = BlocklySimStorage.httpRequest_.workInfo;
var area = workInfo.area;
var frame = workInfo.frame;
var toggleBtn = workInfo.toggleBtn;
var storage;
if (BlocklySimStorage.httpRequest_.name == 'simulator') {
BlocklySimStorage.monitorChanges_(workInfo);
} else if (BlocklySimStorage.httpRequest_.name == 'key') {
if (!data.length) return;
data = JSON.parse(data).simulator;
// 相容舊的情況
if (data) {
storage = JSON.parse(data);
BlocklySimStorage.setConfig_(area, frame, toggleBtn, storage, function () {
BlocklySimStorage.monitorChanges_(workInfo);
});
}
}
}
BlocklySimStorage.httpRequest_ = null;
}
};
/**
* Start monitoring the iframe. If a change is made that changes the iframe,
* clear the key from the URL. Stop monitoring the iframe once such a
* change is detected.
* @param {object} workInfo - {area, frame, toggleBtn}
* @private
*/
BlocklySimStorage.monitorChanges_ = function (workInfo) {
var frame = workInfo.frame;
var win = frame.contentWindow;
var MutationObserver = win.MutationObserver
|| win.WebKitMutationObserver
|| win.MozMutationObserver;
var observeMutationSupport = !!MutationObserver;
if (!observeMutationSupport) {
console.warn('No support MutationObserver!');
return;
}
function change() {
observer.disconnect();
observer = null;
history.pushState('', document.title, window.location.pathname + window.location.search);
}
var observer = new MutationObserver(change);
var option = {
'childList': true,
'attributes': true,
'characterData': true,
'subtree': true
};
observer.observe(win.document.body, option);
};