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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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Roy Tam 2018-01-19 03:59:58 +08:00
commit dcd9973243
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devtools/shared/touch/simulator.js Normal file
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
var promise = require("promise");
var defer = require("devtools/shared/defer");
var Services = require("Services");
const FRAME_SCRIPT =
"resource://devtools/shared/touch/simulator-content.js";
var trackedBrowsers = new WeakMap();
var savedTouchEventsEnabled =
Services.prefs.getIntPref("dom.w3c_touch_events.enabled");
/**
* Simulate touch events for platforms where they aren't generally available.
* Defers to the `simulator-content.js` frame script to perform the real work.
*/
function TouchEventSimulator(browser) {
// Returns an already instantiated simulator for this browser
let simulator = trackedBrowsers.get(browser);
if (simulator) {
return simulator;
}
let mm = browser.frameLoader.messageManager;
mm.loadFrameScript(FRAME_SCRIPT, true);
simulator = {
enabled: false,
start() {
if (this.enabled) {
return promise.resolve({ isReloadNeeded: false });
}
this.enabled = true;
let deferred = defer();
let isReloadNeeded =
Services.prefs.getIntPref("dom.w3c_touch_events.enabled") != 1;
Services.prefs.setIntPref("dom.w3c_touch_events.enabled", 1);
let onStarted = () => {
mm.removeMessageListener("TouchEventSimulator:Started", onStarted);
deferred.resolve({ isReloadNeeded });
};
mm.addMessageListener("TouchEventSimulator:Started", onStarted);
mm.sendAsyncMessage("TouchEventSimulator:Start");
return deferred.promise;
},
stop() {
if (!this.enabled) {
return promise.resolve();
}
this.enabled = false;
let deferred = defer();
Services.prefs.setIntPref("dom.w3c_touch_events.enabled",
savedTouchEventsEnabled);
let onStopped = () => {
mm.removeMessageListener("TouchEventSimulator:Stopped", onStopped);
deferred.resolve();
};
mm.addMessageListener("TouchEventSimulator:Stopped", onStopped);
mm.sendAsyncMessage("TouchEventSimulator:Stop");
return deferred.promise;
}
};
trackedBrowsers.set(browser, simulator);
return simulator;
}
exports.TouchEventSimulator = TouchEventSimulator;