1 files changed, 174 insertions, 0 deletions
diff --git a/accessible/jsat/PointerAdapter.jsm b/accessible/jsat/PointerAdapter.jsm
new file mode 100644
index 000000000..ff54976b7
--- /dev/null
+++ b/accessible/jsat/PointerAdapter.jsm
@@ -0,0 +1,174 @@
+/* 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;
+
+var 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 'android':
+        this._eventsOfInterest = {
+          'touchstart' : true,
+          'touchmove' : true,
+          'touchend' : true };
+        break;
+
+      case 'gonk':
+        this._eventsOfInterest = {
+          'touchstart' : true,
+          'touchmove' : true,
+          'touchend' : true,
+          'mousedown' : false,
+          'mousemove' : 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',
+    'touchmove' : 'pointermove',
+    'mousemove' : 'pointermove',
+    'touchend' : 'pointerup',
+    'mouseup': '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);
+    }
+  },
+
+  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 ||
+        aEvent.isSynthesized) {
+      // 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 (Utils.widgetToolkit === 'android' &&
+      changedTouches.length === 1 && changedTouches[0].identifier === 1) {
+      return;
+    }
+
+    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];
+    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);
+  }
+};