78 lines
2.3 KiB
JavaScript
78 lines
2.3 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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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var promise = require("promise");
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var defer = require("devtools/shared/defer");
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var Services = require("Services");
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const FRAME_SCRIPT =
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"resource://devtools/shared/touch/simulator-content.js";
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var trackedBrowsers = new WeakMap();
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var savedTouchEventsEnabled =
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Services.prefs.getIntPref("dom.w3c_touch_events.enabled");
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/**
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* Simulate touch events for platforms where they aren't generally available.
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* Defers to the `simulator-content.js` frame script to perform the real work.
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*/
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function TouchEventSimulator(browser) {
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// Returns an already instantiated simulator for this browser
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let simulator = trackedBrowsers.get(browser);
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if (simulator) {
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return simulator;
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}
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let mm = browser.frameLoader.messageManager;
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mm.loadFrameScript(FRAME_SCRIPT, true);
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simulator = {
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enabled: false,
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start() {
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if (this.enabled) {
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return promise.resolve({ isReloadNeeded: false });
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}
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this.enabled = true;
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let deferred = defer();
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let isReloadNeeded =
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Services.prefs.getIntPref("dom.w3c_touch_events.enabled") != 1;
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Services.prefs.setIntPref("dom.w3c_touch_events.enabled", 1);
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let onStarted = () => {
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mm.removeMessageListener("TouchEventSimulator:Started", onStarted);
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deferred.resolve({ isReloadNeeded });
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};
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mm.addMessageListener("TouchEventSimulator:Started", onStarted);
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mm.sendAsyncMessage("TouchEventSimulator:Start");
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return deferred.promise;
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},
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stop() {
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if (!this.enabled) {
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return promise.resolve();
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}
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this.enabled = false;
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let deferred = defer();
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Services.prefs.setIntPref("dom.w3c_touch_events.enabled",
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savedTouchEventsEnabled);
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let onStopped = () => {
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mm.removeMessageListener("TouchEventSimulator:Stopped", onStopped);
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deferred.resolve();
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};
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mm.addMessageListener("TouchEventSimulator:Stopped", onStopped);
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mm.sendAsyncMessage("TouchEventSimulator:Stop");
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return deferred.promise;
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}
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};
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trackedBrowsers.set(browser, simulator);
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return simulator;
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}
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exports.TouchEventSimulator = TouchEventSimulator;
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