147 lines
3.9 KiB
JavaScript
147 lines
3.9 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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'use strict';
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this.EXPORTED_SYMBOLS = ['Frames'];
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const Cu = Components.utils;
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const Ci = Components.interfaces;
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Cu.import('resource://gre/modules/Services.jsm');
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Cu.import('resource://gre/modules/SystemAppProxy.jsm');
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const listeners = [];
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const Observer = {
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// Save a map of (MessageManager => Frame) to be able to dispatch
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// the FrameDestroyed event with a frame reference.
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_frames: new Map(),
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// Also save current number of iframes opened by app
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_apps: new Map(),
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start: function () {
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Services.obs.addObserver(this, 'remote-browser-shown', false);
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Services.obs.addObserver(this, 'inprocess-browser-shown', false);
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Services.obs.addObserver(this, 'message-manager-close', false);
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SystemAppProxy.getFrames().forEach(frame => {
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let mm = frame.QueryInterface(Ci.nsIFrameLoaderOwner).frameLoader.messageManager;
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this._frames.set(mm, frame);
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let mozapp = frame.getAttribute('mozapp');
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if (mozapp) {
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this._apps.set(mozapp, (this._apps.get(mozapp) || 0) + 1);
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}
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});
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},
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stop: function () {
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Services.obs.removeObserver(this, 'remote-browser-shown');
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Services.obs.removeObserver(this, 'inprocess-browser-shown');
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Services.obs.removeObserver(this, 'message-manager-close');
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this._frames.clear();
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this._apps.clear();
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},
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observe: function (subject, topic, data) {
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switch(topic) {
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// Listen for frame creation in OOP (device) as well as in parent process (b2g desktop)
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case 'remote-browser-shown':
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case 'inprocess-browser-shown':
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let frameLoader = subject;
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// get a ref to the app <iframe>
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frameLoader.QueryInterface(Ci.nsIFrameLoader);
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let frame = frameLoader.ownerElement;
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let mm = frame.QueryInterface(Ci.nsIFrameLoaderOwner).frameLoader.messageManager;
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this.onMessageManagerCreated(mm, frame);
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break;
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// Every time an iframe is destroyed, its message manager also is
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case 'message-manager-close':
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this.onMessageManagerDestroyed(subject);
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break;
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}
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},
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onMessageManagerCreated: function (mm, frame) {
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this._frames.set(mm, frame);
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let isFirstAppFrame = null;
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let mozapp = frame.getAttribute('mozapp');
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if (mozapp) {
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let count = (this._apps.get(mozapp) || 0) + 1;
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this._apps.set(mozapp, count);
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isFirstAppFrame = (count === 1);
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}
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listeners.forEach(function (listener) {
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try {
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listener.onFrameCreated(frame, isFirstAppFrame);
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} catch(e) {
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dump('Exception while calling Frames.jsm listener:' + e + '\n' +
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e.stack + '\n');
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}
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});
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},
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onMessageManagerDestroyed: function (mm) {
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let frame = this._frames.get(mm);
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if (!frame) {
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// We received an event for an unknown message manager
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return;
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}
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this._frames.delete(mm);
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let isLastAppFrame = null;
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let mozapp = frame.getAttribute('mozapp');
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if (mozapp) {
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let count = (this._apps.get(mozapp) || 0) - 1;
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this._apps.set(mozapp, count);
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isLastAppFrame = (count === 0);
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}
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listeners.forEach(function (listener) {
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try {
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listener.onFrameDestroyed(frame, isLastAppFrame);
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} catch(e) {
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dump('Exception while calling Frames.jsm listener:' + e + '\n' +
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e.stack + '\n');
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}
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});
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}
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};
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var Frames = this.Frames = {
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list: () => SystemAppProxy.getFrames(),
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addObserver: function (listener) {
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if (listeners.indexOf(listener) !== -1) {
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return;
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}
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listeners.push(listener);
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if (listeners.length == 1) {
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Observer.start();
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}
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},
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removeObserver: function (listener) {
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let idx = listeners.indexOf(listener);
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if (idx !== -1) {
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listeners.splice(idx, 1);
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}
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if (listeners.length === 0) {
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Observer.stop();
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}
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}
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};
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