The Tor Browser: browser/base/content/test/general/browser_gestureSupport.js@6474c204b198 (annotated)

browser/base/content/test/general/browser_gestureSupport.js@6474c204b198 (annotated)

browser/base/content/test/general/browser_gestureSupport.js

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/. */
 // Simple gestures tests
 //
 // These tests require the ability to disable the fact that the
 // Firefox chrome intentionally prevents "simple gesture" events from
 // reaching web content.
 let test_utils;
 let test_commandset;
 let test_prefBranch = "browser.gesture.";
 function test()
 {
   waitForExplicitFinish();
   // Disable the default gestures support during the test
   gGestureSupport.init(false);
   test_utils = window.QueryInterface(Components.interfaces.nsIInterfaceRequestor).
     getInterface(Components.interfaces.nsIDOMWindowUtils);
   // Run the tests of "simple gesture" events generally
   test_EnsureConstantsAreDisjoint();
   test_TestEventListeners();
   test_TestEventCreation();
   // Reenable the default gestures support. The remaining tests target
   // the Firefox gesture functionality.
   gGestureSupport.init(true);
   // Test Firefox's gestures support.
   test_commandset = document.getElementById("mainCommandSet");
   test_swipeGestures();
   test_latchedGesture("pinch", "out", "in", "MozMagnifyGesture");
   test_thresholdGesture("pinch", "out", "in", "MozMagnifyGesture");
   test_rotateGestures();
 }
 let test_eventCount = 0;
 let test_expectedType;
 let test_expectedDirection;
 let test_expectedDelta;
 let test_expectedModifiers;
 let test_expectedClickCount;
 let test_imageTab;
 function test_gestureListener(evt)
 {
   is(evt.type, test_expectedType,
      "evt.type (" + evt.type + ") does not match expected value");
   is(evt.target, test_utils.elementFromPoint(20, 20, false, false),
      "evt.target (" + evt.target + ") does not match expected value");
   is(evt.clientX, 20,
      "evt.clientX (" + evt.clientX + ") does not match expected value");
   is(evt.clientY, 20,
      "evt.clientY (" + evt.clientY + ") does not match expected value");
   isnot(evt.screenX, 0,
         "evt.screenX (" + evt.screenX + ") does not match expected value");
   isnot(evt.screenY, 0,
         "evt.screenY (" + evt.screenY + ") does not match expected value");
   is(evt.direction, test_expectedDirection,
      "evt.direction (" + evt.direction + ") does not match expected value");
   is(evt.delta, test_expectedDelta,
      "evt.delta (" + evt.delta + ") does not match expected value");
   is(evt.shiftKey, (test_expectedModifiers & Components.interfaces.nsIDOMEvent.SHIFT_MASK) != 0,
      "evt.shiftKey did not match expected value");
   is(evt.ctrlKey, (test_expectedModifiers & Components.interfaces.nsIDOMEvent.CONTROL_MASK) != 0,
      "evt.ctrlKey did not match expected value");
   is(evt.altKey, (test_expectedModifiers & Components.interfaces.nsIDOMEvent.ALT_MASK) != 0,
      "evt.altKey did not match expected value");
   is(evt.metaKey, (test_expectedModifiers & Components.interfaces.nsIDOMEvent.META_MASK) != 0,
      "evt.metaKey did not match expected value");
   if (evt.type == "MozTapGesture") {
     is(evt.clickCount, test_expectedClickCount, "evt.clickCount does not match");
   }
   test_eventCount++;
 }
 function test_helper1(type, direction, delta, modifiers)
 {
   // Setup the expected values
   test_expectedType = type;
   test_expectedDirection = direction;
   test_expectedDelta = delta;
   test_expectedModifiers = modifiers;
   let expectedEventCount = test_eventCount + 1;
   document.addEventListener(type, test_gestureListener, true);
   test_utils.sendSimpleGestureEvent(type, 20, 20, direction, delta, modifiers);
   document.removeEventListener(type, test_gestureListener, true);
   is(expectedEventCount, test_eventCount, "Event (" + type + ") was never received by event listener");
 }
 function test_clicks(type, clicks)
 {
   // Setup the expected values
   test_expectedType = type;
   test_expectedDirection = 0;
   test_expectedDelta = 0;
   test_expectedModifiers = 0;
   test_expectedClickCount = clicks;
   let expectedEventCount = test_eventCount + 1;
   document.addEventListener(type, test_gestureListener, true);
   test_utils.sendSimpleGestureEvent(type, 20, 20, 0, 0, 0, clicks);
   document.removeEventListener(type, test_gestureListener, true);
   is(expectedEventCount, test_eventCount, "Event (" + type + ") was never received by event listener");
 }
 function test_TestEventListeners()
 {
   let e = test_helper1;  // easier to type this name
   // Swipe gesture animation events
   e("MozSwipeGestureStart", 0, -0.7, 0);
   e("MozSwipeGestureUpdate", 0, -0.4, 0);
   e("MozSwipeGestureEnd", 0, 0, 0);
   e("MozSwipeGestureStart", 0, 0.6, 0);
   e("MozSwipeGestureUpdate", 0, 0.3, 0);
   e("MozSwipeGestureEnd", 0, 1, 0);
   // Swipe gesture event
   e("MozSwipeGesture", SimpleGestureEvent.DIRECTION_LEFT, 0.0, 0);
   e("MozSwipeGesture", SimpleGestureEvent.DIRECTION_RIGHT, 0.0, 0);
   e("MozSwipeGesture", SimpleGestureEvent.DIRECTION_UP, 0.0, 0);
   e("MozSwipeGesture", SimpleGestureEvent.DIRECTION_DOWN, 0.0, 0);
   e("MozSwipeGesture",
     SimpleGestureEvent.DIRECTION_UP | SimpleGestureEvent.DIRECTION_LEFT, 0.0, 0);
   e("MozSwipeGesture",
     SimpleGestureEvent.DIRECTION_DOWN | SimpleGestureEvent.DIRECTION_RIGHT, 0.0, 0);
   e("MozSwipeGesture",
     SimpleGestureEvent.DIRECTION_UP | SimpleGestureEvent.DIRECTION_RIGHT, 0.0, 0);
   e("MozSwipeGesture",
     SimpleGestureEvent.DIRECTION_DOWN | SimpleGestureEvent.DIRECTION_LEFT, 0.0, 0);
   // magnify gesture events
   e("MozMagnifyGestureStart", 0, 50.0, 0);
   e("MozMagnifyGestureUpdate", 0, -25.0, 0);
   e("MozMagnifyGestureUpdate", 0, 5.0, 0);
   e("MozMagnifyGesture", 0, 30.0, 0);
   // rotate gesture events
   e("MozRotateGestureStart", SimpleGestureEvent.ROTATION_CLOCKWISE, 33.0, 0);
   e("MozRotateGestureUpdate", SimpleGestureEvent.ROTATION_COUNTERCLOCKWISE, -13.0, 0);
   e("MozRotateGestureUpdate", SimpleGestureEvent.ROTATION_CLOCKWISE, 13.0, 0);
   e("MozRotateGesture", SimpleGestureEvent.ROTATION_CLOCKWISE, 33.0, 0);
   // Tap and presstap gesture events
   test_clicks("MozTapGesture", 1);
   test_clicks("MozTapGesture", 2);
   test_clicks("MozTapGesture", 3);
   test_clicks("MozPressTapGesture", 1);
   // simple delivery test for edgeui gestures
   e("MozEdgeUIStarted", 0, 0, 0);
   e("MozEdgeUICanceled", 0, 0, 0);
   e("MozEdgeUICompleted", 0, 0, 0);
   // event.shiftKey
   let modifier = Components.interfaces.nsIDOMEvent.SHIFT_MASK;
   e("MozSwipeGesture", SimpleGestureEvent.DIRECTION_RIGHT, 0, modifier);
   // event.metaKey
   modifier = Components.interfaces.nsIDOMEvent.META_MASK;
   e("MozSwipeGesture", SimpleGestureEvent.DIRECTION_RIGHT, 0, modifier);
   // event.altKey
   modifier = Components.interfaces.nsIDOMEvent.ALT_MASK;
   e("MozSwipeGesture", SimpleGestureEvent.DIRECTION_RIGHT, 0, modifier);
   // event.ctrlKey
   modifier = Components.interfaces.nsIDOMEvent.CONTROL_MASK;
   e("MozSwipeGesture", SimpleGestureEvent.DIRECTION_RIGHT, 0, modifier);
 }
 function test_eventDispatchListener(evt)
 {
   test_eventCount++;
   evt.stopPropagation();
 }
 function test_helper2(type, direction, delta, altKey, ctrlKey, shiftKey, metaKey)
 {
   let event = null;
   let successful;
   try {
     event = document.createEvent("SimpleGestureEvent");
     successful = true;
   }
   catch (ex) {
     successful = false;
   }
   ok(successful, "Unable to create SimpleGestureEvent");
   try {
     event.initSimpleGestureEvent(type, true, true, window, 1,
 , 10, 10, 10,
                                  ctrlKey, altKey, shiftKey, metaKey,
 , window,
 , direction, delta, 0);
     successful = true;
   }
   catch (ex) {
     successful = false;
   }
   ok(successful, "event.initSimpleGestureEvent should not fail");
   // Make sure the event fields match the expected values
   is(event.type, type, "Mismatch on evt.type");
   is(event.direction, direction, "Mismatch on evt.direction");
   is(event.delta, delta, "Mismatch on evt.delta");
   is(event.altKey, altKey, "Mismatch on evt.altKey");
   is(event.ctrlKey, ctrlKey, "Mismatch on evt.ctrlKey");
   is(event.shiftKey, shiftKey, "Mismatch on evt.shiftKey");
   is(event.metaKey, metaKey, "Mismatch on evt.metaKey");
   is(event.view, window, "Mismatch on evt.view");
   is(event.detail, 1, "Mismatch on evt.detail");
   is(event.clientX, 10, "Mismatch on evt.clientX");
   is(event.clientY, 10, "Mismatch on evt.clientY");
   is(event.screenX, 10, "Mismatch on evt.screenX");
   is(event.screenY, 10, "Mismatch on evt.screenY");
   is(event.button, 1, "Mismatch on evt.button");
   is(event.relatedTarget, window, "Mismatch on evt.relatedTarget");
   // Test event dispatch
   let expectedEventCount = test_eventCount + 1;
   document.addEventListener(type, test_eventDispatchListener, true);
   document.dispatchEvent(event);
   document.removeEventListener(type, test_eventDispatchListener, true);
   is(expectedEventCount, test_eventCount, "Dispatched event was never received by listener");
 }
 function test_TestEventCreation()
 {
   // Event creation
   test_helper2("MozMagnifyGesture", SimpleGestureEvent.DIRECTION_RIGHT, 20.0,
                true, false, true, false);
   test_helper2("MozMagnifyGesture", SimpleGestureEvent.DIRECTION_LEFT, -20.0,
                false, true, false, true);
 }
 function test_EnsureConstantsAreDisjoint()
 {
   let up = SimpleGestureEvent.DIRECTION_UP;
   let down = SimpleGestureEvent.DIRECTION_DOWN;
   let left = SimpleGestureEvent.DIRECTION_LEFT;
   let right = SimpleGestureEvent.DIRECTION_RIGHT;
   let clockwise = SimpleGestureEvent.ROTATION_CLOCKWISE;
   let cclockwise = SimpleGestureEvent.ROTATION_COUNTERCLOCKWISE;
   ok(up ^ down, "DIRECTION_UP and DIRECTION_DOWN are not bitwise disjoint");
   ok(up ^ left, "DIRECTION_UP and DIRECTION_LEFT are not bitwise disjoint");
   ok(up ^ right, "DIRECTION_UP and DIRECTION_RIGHT are not bitwise disjoint");
   ok(down ^ left, "DIRECTION_DOWN and DIRECTION_LEFT are not bitwise disjoint");
   ok(down ^ right, "DIRECTION_DOWN and DIRECTION_RIGHT are not bitwise disjoint");
   ok(left ^ right, "DIRECTION_LEFT and DIRECTION_RIGHT are not bitwise disjoint");
   ok(clockwise ^ cclockwise, "ROTATION_CLOCKWISE and ROTATION_COUNTERCLOCKWISE are not bitwise disjoint");
 }
 // Helper for test of latched event processing. Emits the actual
 // gesture events to test whether the commands associated with the
 // gesture will only trigger once for each direction of movement.
 function test_emitLatchedEvents(eventPrefix, initialDelta, cmd)
 {
   let cumulativeDelta = 0;
   let isIncreasing = initialDelta > 0;
   let expect = {};
   // Reset the call counters and initialize expected values
   for (let dir in cmd)
     cmd[dir].callCount = expect[dir] = 0;
   let check = function(aDir, aMsg) ok(cmd[aDir].callCount == expect[aDir], aMsg);
   let checkBoth = function(aNum, aInc, aDec) {
     let prefix = "Step " + aNum + ": ";
     check("inc", prefix + aInc);
     check("dec", prefix + aDec);
   };
   // Send the "Start" event.
   test_utils.sendSimpleGestureEvent(eventPrefix + "Start", 0, 0, 0, initialDelta, 0);
   cumulativeDelta += initialDelta;
   if (isIncreasing) {
     expect.inc++;
     checkBoth(1, "Increasing command was not triggered", "Decreasing command was triggered");
   } else {
     expect.dec++;
     checkBoth(1, "Increasing command was triggered", "Decreasing command was not triggered");
   }
   // Send random values in the same direction and ensure neither
   // command triggers.
   for (let i = 0; i < 5; i++) {
       let delta = Math.random() * (isIncreasing ? 100 : -100);
     test_utils.sendSimpleGestureEvent(eventPrefix + "Update", 0, 0, 0, delta, 0);
     cumulativeDelta += delta;
     checkBoth(2, "Increasing command was triggered", "Decreasing command was triggered");
   }
   // Now go back in the opposite direction.
   test_utils.sendSimpleGestureEvent(eventPrefix + "Update", 0, 0, 0,
 				    - initialDelta, 0);
   cumulativeDelta += - initialDelta;
   if (isIncreasing) {
     expect.dec++;
     checkBoth(3, "Increasing command was triggered", "Decreasing command was not triggered");
   } else {
     expect.inc++;
     checkBoth(3, "Increasing command was not triggered", "Decreasing command was triggered");
   }
   // Send random values in the opposite direction and ensure neither
   // command triggers.
   for (let i = 0; i < 5; i++) {
     let delta = Math.random() * (isIncreasing ? -100 : 100);
     test_utils.sendSimpleGestureEvent(eventPrefix + "Update", 0, 0, 0, delta, 0);
     cumulativeDelta += delta;
     checkBoth(4, "Increasing command was triggered", "Decreasing command was triggered");
   }
   // Go back to the original direction. The original command should trigger.
   test_utils.sendSimpleGestureEvent(eventPrefix + "Update", 0, 0, 0,
 				    initialDelta, 0);
   cumulativeDelta += initialDelta;
   if (isIncreasing) {
     expect.inc++;
     checkBoth(5, "Increasing command was not triggered", "Decreasing command was triggered");
   } else {
     expect.dec++;
     checkBoth(5, "Increasing command was triggered", "Decreasing command was not triggered");
   }
   // Send the wrap-up event. No commands should be triggered.
   test_utils.sendSimpleGestureEvent(eventPrefix, 0, 0, 0, cumulativeDelta, 0);
   checkBoth(6, "Increasing command was triggered", "Decreasing command was triggered");
 }
 function test_addCommand(prefName, id)
 {
   let cmd = test_commandset.appendChild(document.createElement("command"));
   cmd.setAttribute("id", id);
   cmd.setAttribute("oncommand", "this.callCount++;");
   cmd.origPrefName = prefName;
   cmd.origPrefValue = gPrefService.getCharPref(prefName);
   gPrefService.setCharPref(prefName, id);
   return cmd;
 }
 function test_removeCommand(cmd)
 {
   gPrefService.setCharPref(cmd.origPrefName, cmd.origPrefValue);
   test_commandset.removeChild(cmd);
 }
 // Test whether latched events are only called once per direction of motion.
 function test_latchedGesture(gesture, inc, dec, eventPrefix)
 {
   let branch = test_prefBranch + gesture + ".";
   // Put the gesture into latched mode.
   let oldLatchedValue = gPrefService.getBoolPref(branch + "latched");
   gPrefService.setBoolPref(branch + "latched", true);
   // Install the test commands for increasing and decreasing motion.
   let cmd = {
     inc: test_addCommand(branch + inc, "test:incMotion"),
     dec: test_addCommand(branch + dec, "test:decMotion"),
   };
   // Test the gestures in each direction.
   test_emitLatchedEvents(eventPrefix, 500, cmd);
   test_emitLatchedEvents(eventPrefix, -500, cmd);
   // Restore the gesture to its original configuration.
   gPrefService.setBoolPref(branch + "latched", oldLatchedValue);
   for (let dir in cmd)
     test_removeCommand(cmd[dir]);
 }
 // Test whether non-latched events are triggered upon sufficient motion.
 function test_thresholdGesture(gesture, inc, dec, eventPrefix)
 {
   let branch = test_prefBranch + gesture + ".";
   // Disable latched mode for this gesture.
   let oldLatchedValue = gPrefService.getBoolPref(branch + "latched");
   gPrefService.setBoolPref(branch + "latched", false);
   // Set the triggering threshold value to 50.
   let oldThresholdValue = gPrefService.getIntPref(branch + "threshold");
   gPrefService.setIntPref(branch + "threshold", 50);
   // Install the test commands for increasing and decreasing motion.
   let cmdInc = test_addCommand(branch + inc, "test:incMotion");
   let cmdDec = test_addCommand(branch + dec, "test:decMotion");
   // Send the start event but stop short of triggering threshold.
   cmdInc.callCount = cmdDec.callCount = 0;
   test_utils.sendSimpleGestureEvent(eventPrefix + "Start", 0, 0, 0, 49.5, 0);
   ok(cmdInc.callCount == 0, "Increasing command was triggered");
   ok(cmdDec.callCount == 0, "Decreasing command was triggered");
   // Now trigger the threshold.
   cmdInc.callCount = cmdDec.callCount = 0;
   test_utils.sendSimpleGestureEvent(eventPrefix + "Update", 0, 0, 0, 1, 0);
   ok(cmdInc.callCount == 1, "Increasing command was not triggered");
   ok(cmdDec.callCount == 0, "Decreasing command was triggered");
   // The tracking counter should go to zero. Go back the other way and
   // stop short of triggering the threshold.
   cmdInc.callCount = cmdDec.callCount = 0;
   test_utils.sendSimpleGestureEvent(eventPrefix + "Update", 0, 0, 0, -49.5, 0);
   ok(cmdInc.callCount == 0, "Increasing command was triggered");
   ok(cmdDec.callCount == 0, "Decreasing command was triggered");
   // Now cross the threshold and trigger the decreasing command.
   cmdInc.callCount = cmdDec.callCount = 0;
   test_utils.sendSimpleGestureEvent(eventPrefix + "Update", 0, 0, 0, -1.5, 0);
   ok(cmdInc.callCount == 0, "Increasing command was triggered");
   ok(cmdDec.callCount == 1, "Decreasing command was not triggered");
   // Send the wrap-up event. No commands should trigger.
   cmdInc.callCount = cmdDec.callCount = 0;
   test_utils.sendSimpleGestureEvent(eventPrefix, 0, 0, 0, -0.5, 0);
   ok(cmdInc.callCount == 0, "Increasing command was triggered");
   ok(cmdDec.callCount == 0, "Decreasing command was triggered");
   // Restore the gesture to its original configuration.
   gPrefService.setBoolPref(branch + "latched", oldLatchedValue);
   gPrefService.setIntPref(branch + "threshold", oldThresholdValue);
   test_removeCommand(cmdInc);
   test_removeCommand(cmdDec);
 }
 function test_swipeGestures()
 {
   // easier to type names for the direction constants
   let up = SimpleGestureEvent.DIRECTION_UP;
   let down = SimpleGestureEvent.DIRECTION_DOWN;
   let left = SimpleGestureEvent.DIRECTION_LEFT;
   let right = SimpleGestureEvent.DIRECTION_RIGHT;
   let branch = test_prefBranch + "swipe.";
   // Install the test commands for the swipe gestures.
   let cmdUp = test_addCommand(branch + "up", "test:swipeUp");
   let cmdDown = test_addCommand(branch + "down", "test:swipeDown");
   let cmdLeft = test_addCommand(branch + "left", "test:swipeLeft");
   let cmdRight = test_addCommand(branch + "right", "test:swipeRight");
   function resetCounts() {
     cmdUp.callCount = 0;
     cmdDown.callCount = 0;
     cmdLeft.callCount = 0;
     cmdRight.callCount = 0;
   }
   // UP
   resetCounts();
   test_utils.sendSimpleGestureEvent("MozSwipeGesture", 0, 0, up, 0, 0);
   ok(cmdUp.callCount == 1, "Step 1: Up command was not triggered");
   ok(cmdDown.callCount == 0, "Step 1: Down command was triggered");
   ok(cmdLeft.callCount == 0, "Step 1: Left command was triggered");
   ok(cmdRight.callCount == 0, "Step 1: Right command was triggered");
   // DOWN
   resetCounts();
   test_utils.sendSimpleGestureEvent("MozSwipeGesture", 0, 0, down, 0, 0);
   ok(cmdUp.callCount == 0, "Step 2: Up command was triggered");
   ok(cmdDown.callCount == 1, "Step 2: Down command was not triggered");
   ok(cmdLeft.callCount == 0, "Step 2: Left command was triggered");
   ok(cmdRight.callCount == 0, "Step 2: Right command was triggered");
   // LEFT
   resetCounts();
   test_utils.sendSimpleGestureEvent("MozSwipeGesture", 0, 0, left, 0, 0);
   ok(cmdUp.callCount == 0, "Step 3: Up command was triggered");
   ok(cmdDown.callCount == 0, "Step 3: Down command was triggered");
   ok(cmdLeft.callCount == 1, "Step 3: Left command was not triggered");
   ok(cmdRight.callCount == 0, "Step 3: Right command was triggered");
   // RIGHT
   resetCounts();
   test_utils.sendSimpleGestureEvent("MozSwipeGesture", 0, 0, right, 0, 0);
   ok(cmdUp.callCount == 0, "Step 4: Up command was triggered");
   ok(cmdDown.callCount == 0, "Step 4: Down command was triggered");
   ok(cmdLeft.callCount == 0, "Step 4: Left command was triggered");
   ok(cmdRight.callCount == 1, "Step 4: Right command was not triggered");
   // Make sure combinations do not trigger events.
   let combos = [ up | left, up | right, down | left, down | right];
   for (let i = 0; i < combos.length; i++) {
     resetCounts();
     test_utils.sendSimpleGestureEvent("MozSwipeGesture", 0, 0, combos[i], 0, 0);
     ok(cmdUp.callCount == 0, "Step 5-"+i+": Up command was triggered");
     ok(cmdDown.callCount == 0, "Step 5-"+i+": Down command was triggered");
     ok(cmdLeft.callCount == 0, "Step 5-"+i+": Left command was triggered");
     ok(cmdRight.callCount == 0, "Step 5-"+i+": Right command was triggered");
   }
   // Remove the test commands.
   test_removeCommand(cmdUp);
   test_removeCommand(cmdDown);
   test_removeCommand(cmdLeft);
   test_removeCommand(cmdRight);
 }
 function test_rotateHelperGetImageRotation(aImageElement)
 {
   // Get the true image rotation from the transform matrix, bounded
   // to 0 <= result < 360
   let transformValue = content.window.getComputedStyle(aImageElement, null)
                                      .transform;
   if (transformValue == "none")
     return 0;
   transformValue = transformValue.split("(")[1]
                                  .split(")")[0]
                                  .split(",");
   var rotation = Math.round(Math.atan2(transformValue[1], transformValue[0]) *
                             (180 / Math.PI));
   return (rotation < 0 ? rotation + 360 : rotation);
 }
 function test_rotateHelperOneGesture(aImageElement, aCurrentRotation,
                                      aDirection, aAmount, aStop)
 {
   if (aAmount <= 0 || aAmount > 90) // Bound to 0 < aAmount <= 90
     return;
   // easier to type names for the direction constants
   let clockwise = SimpleGestureEvent.ROTATION_CLOCKWISE;
   let cclockwise = SimpleGestureEvent.ROTATION_COUNTERCLOCKWISE;
   let delta = aAmount * (aDirection == clockwise ? 1 : -1);
   // Kill transition time on image so test isn't wrong and doesn't take 10 seconds
   aImageElement.style.transitionDuration = "0s";
   // Start the gesture, perform an update, and force flush
   test_utils.sendSimpleGestureEvent("MozRotateGestureStart", 0, 0, aDirection, .001, 0);
   test_utils.sendSimpleGestureEvent("MozRotateGestureUpdate", 0, 0, aDirection, delta, 0);
   aImageElement.clientTop;
   // If stop, check intermediate
   if (aStop) {
     // Send near-zero-delta to stop, and force flush
     test_utils.sendSimpleGestureEvent("MozRotateGestureUpdate", 0, 0, aDirection, .001, 0);
     aImageElement.clientTop;
     let stopExpectedRotation = (aCurrentRotation + delta) % 360;
     if (stopExpectedRotation < 0)
       stopExpectedRotation += 360;
     is(stopExpectedRotation, test_rotateHelperGetImageRotation(aImageElement),
        "Image rotation at gesture stop/hold: expected=" + stopExpectedRotation +
        ", observed=" + test_rotateHelperGetImageRotation(aImageElement) +
        ", init=" + aCurrentRotation +
        ", amt=" + aAmount +
        ", dir=" + (aDirection == clockwise ? "cl" : "ccl"));
   }
   // End it and force flush
   test_utils.sendSimpleGestureEvent("MozRotateGesture", 0, 0, aDirection, 0, 0);
   aImageElement.clientTop;
   let finalExpectedRotation;
   if (aAmount < 45 && aStop) {
     // Rotate a bit, then stop.  Expect no change at end of gesture.
     finalExpectedRotation = aCurrentRotation;
   }
   else {
     // Either not stopping (expect 90 degree change in aDirection), OR
     // stopping but after 45, (expect 90 degree change in aDirection)
     finalExpectedRotation = (aCurrentRotation +
                              (aDirection == clockwise ? 1 : -1) * 90) % 360;
     if (finalExpectedRotation < 0)
       finalExpectedRotation += 360;
   }
   is(finalExpectedRotation, test_rotateHelperGetImageRotation(aImageElement),
      "Image rotation gesture end: expected=" + finalExpectedRotation +
      ", observed=" + test_rotateHelperGetImageRotation(aImageElement) +
      ", init=" + aCurrentRotation +
      ", amt=" + aAmount +
      ", dir=" + (aDirection == clockwise ? "cl" : "ccl"));
 }
 function test_rotateGesturesOnTab()
 {
   gBrowser.selectedBrowser.removeEventListener("load", test_rotateGesturesOnTab, true);
   if (!(content.document instanceof ImageDocument)) {
     ok(false, "Image document failed to open for rotation testing");
     gBrowser.removeTab(test_imageTab);
     finish();
     return;
   }
   // easier to type names for the direction constants
   let cl = SimpleGestureEvent.ROTATION_CLOCKWISE;
   let ccl = SimpleGestureEvent.ROTATION_COUNTERCLOCKWISE;
   let imgElem = content.document.body &&
                 content.document.body.firstElementChild;
   if (!imgElem) {
     ok(false, "Could not get image element on ImageDocument for rotation!");
     gBrowser.removeTab(test_imageTab);
     finish();
     return;
   }
   // Quick function to normalize rotation to 0 <= r < 360
   var normRot = function(rotation) {
     rotation = rotation % 360;
     if (rotation < 0)
       rotation += 360;
     return rotation;
   }
   for (var initRot = 0; initRot < 360; initRot += 90) {
     // Test each case: at each 90 degree snap; cl/ccl;
     // amount more or less than 45; stop and hold or don't (32 total tests)
     // The amount added to the initRot is where it is expected to be
     test_rotateHelperOneGesture(imgElem, normRot(initRot +   0), cl,  35, true );
     test_rotateHelperOneGesture(imgElem, normRot(initRot +   0), cl,  35, false);
     test_rotateHelperOneGesture(imgElem, normRot(initRot +  90), cl,  55, true );
     test_rotateHelperOneGesture(imgElem, normRot(initRot + 180), cl,  55, false);
     test_rotateHelperOneGesture(imgElem, normRot(initRot + 270), ccl, 35, true );
     test_rotateHelperOneGesture(imgElem, normRot(initRot + 270), ccl, 35, false);
     test_rotateHelperOneGesture(imgElem, normRot(initRot + 180), ccl, 55, true );
     test_rotateHelperOneGesture(imgElem, normRot(initRot +  90), ccl, 55, false);
     // Manually rotate it 90 degrees clockwise to prepare for next iteration,
     // and force flush
     test_utils.sendSimpleGestureEvent("MozRotateGestureStart", 0, 0, cl, .001, 0);
     test_utils.sendSimpleGestureEvent("MozRotateGestureUpdate", 0, 0, cl, 90, 0);
     test_utils.sendSimpleGestureEvent("MozRotateGestureUpdate", 0, 0, cl, .001, 0);
     test_utils.sendSimpleGestureEvent("MozRotateGesture", 0, 0, cl, 0, 0);
     imgElem.clientTop;
   }
   gBrowser.removeTab(test_imageTab);
   test_imageTab = null;
   finish();
 }
 function test_rotateGestures()
 {
   test_imageTab = gBrowser.addTab("chrome://branding/content/about-logo.png");
   gBrowser.selectedTab = test_imageTab;
   gBrowser.selectedBrowser.addEventListener("load", test_rotateGesturesOnTab, true);
 }