The Tor Browser: accessible/src/jsat/PointerAdapter.jsm@6474c204b198 (annotated)

accessible/src/jsat/PointerAdapter.jsm@6474c204b198 (annotated)

accessible/src/jsat/PointerAdapter.jsm

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* 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/. */
 /* global Components, XPCOMUtils, Utils, Logger, GestureSettings,
    GestureTracker */
 /* exported PointerRelay, PointerAdapter */
 'use strict';
 const Ci = Components.interfaces;
 const Cu = Components.utils;
 this.EXPORTED_SYMBOLS = ['PointerRelay', 'PointerAdapter']; // jshint ignore:line
 Cu.import('resource://gre/modules/XPCOMUtils.jsm');
 XPCOMUtils.defineLazyModuleGetter(this, 'Utils', // jshint ignore:line
   'resource://gre/modules/accessibility/Utils.jsm');
 XPCOMUtils.defineLazyModuleGetter(this, 'Logger', // jshint ignore:line
   'resource://gre/modules/accessibility/Utils.jsm');
 XPCOMUtils.defineLazyModuleGetter(this, 'GestureSettings', // jshint ignore:line
   'resource://gre/modules/accessibility/Gestures.jsm');
 XPCOMUtils.defineLazyModuleGetter(this, 'GestureTracker', // jshint ignore:line
   'resource://gre/modules/accessibility/Gestures.jsm');
 // The virtual touch ID generated by a mouse event.
 const MOUSE_ID = 'mouse';
 // Synthesized touch ID.
 const SYNTH_ID = -1;
 let PointerRelay = { // jshint ignore:line
   /**
    * A mapping of events we should be intercepting. Entries with a value of
    * |true| are used for compiling high-level gesture events. Entries with a
    * value of |false| are cancelled and do not propogate to content.
    */
   get _eventsOfInterest() {
     delete this._eventsOfInterest;
     switch (Utils.widgetToolkit) {
       case 'gonk':
         this._eventsOfInterest = {
           'touchstart' : true,
           'touchmove' : true,
           'touchend' : true,
           'mousedown' : false,
           'mousemove' : false,
           'mouseup': false,
           'click': false };
         break;
       case 'android':
         this._eventsOfInterest = {
           'touchstart' : true,
           'touchmove' : true,
           'touchend' : true,
           'mousemove' : true,
           'mouseenter' : true,
           'mouseleave' : true,
           'mousedown' : false,
           'mouseup': false,
           'click': false };
         break;
       default:
         // Desktop.
         this._eventsOfInterest = {
           'mousemove' : true,
           'mousedown' : true,
           'mouseup': true,
           'click': false
         };
         if ('ontouchstart' in Utils.win) {
           for (let eventType of ['touchstart', 'touchmove', 'touchend']) {
             this._eventsOfInterest[eventType] = true;
           }
         }
         break;
     }
     return this._eventsOfInterest;
   },
   _eventMap: {
     'touchstart' : 'pointerdown',
     'mousedown' : 'pointerdown',
     'mouseenter' : 'pointerdown',
     'touchmove' : 'pointermove',
     'mousemove' : 'pointermove',
     'touchend' : 'pointerup',
     'mouseup': 'pointerup',
     'mouseleave': 'pointerup'
   },
   start: function PointerRelay_start(aOnPointerEvent) {
     Logger.debug('PointerRelay.start');
     this.onPointerEvent = aOnPointerEvent;
     for (let eventType in this._eventsOfInterest) {
       Utils.win.addEventListener(eventType, this, true, true);
     }
   },
   stop: function PointerRelay_stop() {
     Logger.debug('PointerRelay.stop');
     delete this.lastPointerMove;
     delete this.onPointerEvent;
     for (let eventType in this._eventsOfInterest) {
       Utils.win.removeEventListener(eventType, this, true, true);
     }
   },
   _suppressPointerMove: function PointerRelay__suppressPointerMove(aChangedTouches) {
     if (!this.lastPointerMove) {
       return false;
     }
     for (let i = 0; i < aChangedTouches.length; ++i) {
       let touch = aChangedTouches[i];
       let lastTouch;
       try {
         lastTouch = this.lastPointerMove.identifiedTouch ?
           this.lastPointerMove.identifiedTouch(touch.identifier) :
           this.lastPointerMove[i];
       } catch (x) {
         // Sometimes touch object can't be accessed after page navigation.
       }
       if (!lastTouch || lastTouch.target !== touch.target ||
         Math.hypot(touch.screenX - lastTouch.screenX, touch.screenY -
           lastTouch.screenY) / Utils.dpi >= GestureSettings.travelThreshold) {
         return false;
       }
     }
     return true;
   },
   handleEvent: function PointerRelay_handleEvent(aEvent) {
     // Don't bother with chrome mouse events.
     if (Utils.MozBuildApp === 'browser' &&
       aEvent.view.top instanceof Ci.nsIDOMChromeWindow) {
       return;
     }
     if (aEvent.mozInputSource === Ci.nsIDOMMouseEvent.MOZ_SOURCE_UNKNOWN) {
       // Ignore events that are scripted or clicks from the a11y API.
       return;
     }
     let changedTouches = aEvent.changedTouches || [{
       identifier: MOUSE_ID,
       screenX: aEvent.screenX,
       screenY: aEvent.screenY,
       target: aEvent.target
     }];
     if (changedTouches.length === 1 &&
         changedTouches[0].identifier === SYNTH_ID) {
       return;
     }
     aEvent.preventDefault();
     aEvent.stopImmediatePropagation();
     let type = aEvent.type;
     if (!this._eventsOfInterest[type]) {
       return;
     }
     let pointerType = this._eventMap[type];
     if (pointerType === 'pointermove') {
       if (this._suppressPointerMove(changedTouches)) {
         // Do not fire pointermove more than every POINTERMOVE_THROTTLE.
         return;
       }
       this.lastPointerMove = changedTouches;
     }
     this.onPointerEvent({
       type: pointerType,
       points: Array.prototype.map.call(changedTouches,
         function mapTouch(aTouch) {
           return {
             identifier: aTouch.identifier,
             x: aTouch.screenX,
             y: aTouch.screenY
           };
         }
       )
     });
   }
 };
 this.PointerAdapter = { // jshint ignore:line
   start: function PointerAdapter_start() {
     Logger.debug('PointerAdapter.start');
     GestureTracker.reset();
     PointerRelay.start(this.handleEvent);
   },
   stop: function PointerAdapter_stop() {
     Logger.debug('PointerAdapter.stop');
     PointerRelay.stop();
     GestureTracker.reset();
   },
   handleEvent: function PointerAdapter_handleEvent(aDetail) {
     let timeStamp = Date.now();
     GestureTracker.handle(aDetail, timeStamp);
   }
 };

The Tor Browser / annotate

accessible/src/jsat/PointerAdapter.jsm@6474c204b198 (annotated)

accessible/src/jsat/PointerAdapter.jsm