<!DOCTYPE HTML>
<html style="font-size: 32px;">
<head>
  <title>Test for D3E WheelEvent</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <script src="/tests/SimpleTest/EventUtils.js"></script>
  <script src="/tests/SimpleTest/paint_listener.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
<p id="display"></p>
<div id="scrollable" style="font-family: monospace; font-size: 16px; line-height: 1; overflow: auto; width: 200px; height: 200px;">
  <div id="scrolled" style="font-size: 64px; width: 5000px; height: 5000px;">
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
    Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text. Tere is a lot of text.<br>
  </div>
</div>
<div id="content" style="display: none">

</div>
<pre id="test">
<script type="application/javascript">

SimpleTest.waitForExplicitFinish();
SimpleTest.waitForFocus(runTest, window);

var gScrollableElement = document.getElementById("scrollable");
var gScrolledElement = document.getElementById("scrolled");

var gLineHeight = 0;
var gHorizontalLine = 0;
var gPageHeight = 0;
var gPageWidth  = 0;

function sendWheelAndWait(aX, aY, aEvent)
{
  sendWheelAndPaint(gScrollableElement, aX, aY, aEvent, continueTest);
}

function* prepareScrollUnits()
{
  var result = -1;
  function handler(aEvent)
  {
    result = aEvent.detail;
    aEvent.preventDefault();
  }
  window.addEventListener("MozMousePixelScroll", handler, { capture: true, passive: false });

  yield sendWheelAndWait(10, 10,
                         { deltaMode: WheelEvent.DOM_DELTA_LINE,
                           deltaY: 1.0, lineOrPageDeltaY: 1 });
  gLineHeight = result;
  ok(gLineHeight > 10 && gLineHeight < 25, "prepareScrollUnits: gLineHeight may be illegal value, got " + gLineHeight);

  result = -1;
  yield sendWheelAndWait(10, 10,
                         { deltaMode: WheelEvent.DOM_DELTA_LINE,
                           deltaX: 1.0, lineOrPageDeltaX: 1 });
  gHorizontalLine = result;
  ok(gHorizontalLine > 5 && gHorizontalLine < 16, "prepareScrollUnits: gHorizontalLine may be illegal value, got " + gHorizontalLine);

  result = -1;
  yield sendWheelAndWait(10, 10,
                         { deltaMode: WheelEvent.DOM_DELTA_PAGE,
                           deltaY: 1.0, lineOrPageDeltaY: 1 });
  gPageHeight = result;
  // XXX Cannot we know the actual scroll port size?
  ok(gPageHeight >= 150 && gPageHeight <= 200,
     "prepareScrollUnits: gPageHeight is strange value, got " + gPageHeight);

  result = -1;
  yield sendWheelAndWait(10, 10,
                         { deltaMode: WheelEvent.DOM_DELTA_PAGE,
                           deltaX: 1.0, lineOrPageDeltaX: 1 });
  gPageWidth = result;
  ok(gPageWidth >= 150 && gPageWidth <= 200,
     "prepareScrollUnits: gPageWidth is strange value, got " + gPageWidth);

  window.removeEventListener("MozMousePixelScroll", handler, true);
}

function testMakingUntrustedEvent()
{
  const kCreateEventArgs = [
    "WheelEvent", "wheelevent", "wheelEvent", "Wheelevent"
  ];

  for (var i = 0; i < kCreateEventArgs.length; i++) {
    try {
      // We never support WheelEvent construction with document.createEvent().
      var event = document.createEvent(kCreateEventArgs[i]);
      ok(false, "document.createEvent(" + kCreateEventArgs[i] + ") should throw an error");
    } catch (e) {
      ok(true, "document.createEvent(" + kCreateEventArgs[i] + ") threw an error");
    }
  }

  var wheelEvent = new WheelEvent("wheel");
  ok(wheelEvent instanceof WheelEvent,
     "new WheelEvent() should create an instance of WheelEvent");
  ok(typeof(wheelEvent.initWheelEvent) != "function",
     "WheelEvent must not have initWheelEvent()");
}

// delta_multiplier prefs should cause changing delta values of trusted events only.
// And also legacy events' detail value should be changed too.
function* testDeltaMultiplierPrefs()
{
  const kModifierAlt     = 0x01;
  const kModifierControl = 0x02;
  const kModifierMeta    = 0x04;
  const kModifierShift   = 0x08;
  const kModifierWin     = 0x10;

  const kTests = [
    { name: "default",
      expected: [ 0, kModifierShift | kModifierAlt, kModifierShift | kModifierControl,
                     kModifierShift | kModifierMeta, kModifierShift | kModifierWin,
                     kModifierControl | kModifierAlt, kModifierMeta | kModifierAlt ],
      unexpected: [ kModifierAlt, kModifierControl, kModifierMeta, kModifierShift, kModifierWin ] },
    { name: "with_alt",
      expected: [ kModifierAlt ],
      unexpected: [0, kModifierControl, kModifierMeta, kModifierShift, kModifierWin,
                      kModifierShift | kModifierAlt, kModifierControl | kModifierAlt,
                      kModifierMeta | kModifierAlt ] },
    { name: "with_control",
      expected: [ kModifierControl ],
      unexpected: [0, kModifierAlt, kModifierMeta, kModifierShift, kModifierWin,
                      kModifierShift | kModifierControl, kModifierControl | kModifierAlt,
                      kModifierMeta | kModifierControl ] },
    { name: "with_meta",
      expected: [ kModifierMeta ],
      unexpected: [0, kModifierAlt, kModifierControl, kModifierShift, kModifierWin,
                      kModifierShift | kModifierMeta, kModifierControl | kModifierMeta,
                      kModifierMeta | kModifierAlt ] },
    { name: "with_shift",
      expected: [ kModifierShift ],
      unexpected: [0, kModifierAlt, kModifierControl, kModifierMeta, kModifierWin,
                      kModifierShift | kModifierAlt, kModifierControl | kModifierShift,
                      kModifierMeta | kModifierShift ] },
    { name: "with_win",
      expected: [ kModifierWin ],
      unexpected: [0, kModifierAlt, kModifierControl, kModifierMeta, kModifierShift,
                      kModifierShift | kModifierWin ] },
  ];

  // Note that this test doesn't support complicated lineOrPageDelta values which are computed with
  // accumulated delta values by the prefs.  If you need to test the lineOrPageDelta accumulation,
  // use test_continuous_dom_wheel_event.html.
  const kEvents = [
    { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
      deltaX: gHorizontalLine, deltaY: gLineHeight, deltaZ: gLineHeight, lineOrPageDeltaX: 1, lineOrPageDeltaY: 1 },
    { deltaMode: WheelEvent.DOM_DELTA_LINE,
      deltaX: 1.0, deltaY: 1.0, deltaZ: 1.0, lineOrPageDeltaX: 1, lineOrPageDeltaY: 1 },
    { deltaMode: WheelEvent.DOM_DELTA_PAGE,
      deltaX: 1.0, deltaY: 1.0, deltaZ: 1.0, lineOrPageDeltaX: 1, lineOrPageDeltaY: 1 },
    { deltaMode: WheelEvent.DOM_DELTA_PIXEL,
      deltaX: -gHorizontalLine, deltaY: -gLineHeight, deltaZ: -gLineHeight, lineOrPageDeltaX: -1, lineOrPageDeltaY: -1 },
    { deltaMode: WheelEvent.DOM_DELTA_LINE,
      deltaX: -1.0, deltaY: -1.0, deltaZ: -1.0, lineOrPageDeltaX: -1, lineOrPageDeltaY: -1 },
    { deltaMode: WheelEvent.DOM_DELTA_LINE, skipDeltaModeCheck: true,
      deltaX: -1.0, deltaY: -1.0, deltaZ: -1.0, lineOrPageDeltaX: -1, lineOrPageDeltaY: -1 },
    { deltaMode: WheelEvent.DOM_DELTA_PAGE,
      deltaX: -1.0, deltaY: -1.0, deltaZ: -1.0, lineOrPageDeltaX: -1, lineOrPageDeltaY: -1 },
  ];

  const kDeltaMultiplierPrefs = [
    "delta_multiplier_x", "delta_multiplier_y", "delta_multiplier_z"
  ];

  const kPrefValues = [
    200, 50, 0, -50, -150
  ];

  var currentTest, currentModifiers, currentEvent, currentPref, currentMultiplier, testingExpected;
  var expectedAsyncHandlerCalls;
  var description;
  var calledHandlers = { wheel: false,
                         DOMMouseScroll: { horizontal: false, vertical: false },
                         MozMousePixelScroll: { horizontal: false, vertical: false } };

  function deltaToPixels(mode, delta, horizontal) {
    switch (mode) {
      case WheelEvent.DOM_DELTA_PIXEL:
        return delta;
      case WheelEvent.DOM_DELTA_LINE:
        return delta * (horizontal ? gHorizontalLine : gLineHeight);
      case WheelEvent.DOM_DELTA_PAGE:
        return delta * (horizontal ? gPageWidth : gPageHeight);
    }
    throw new Error("Unknown delta mode");
  }

  function defaultScrollMultiplier(horizontal) {
    if (!SpecialPowers.getBoolPref("mousewheel.system_scroll_override.enabled")) {
      return 1;
    }
    return SpecialPowers.getIntPref(`mousewheel.system_scroll_override.${horizontal ? "horizontal" : "vertical"}.factor`) / 100;
  }

  function wheelEventHandler(aEvent) {
    calledHandlers.wheel = true;

    var expectedDeltaX = currentEvent.deltaX;
    var expectedDeltaY = currentEvent.deltaY;
    var expectedDeltaZ = currentEvent.deltaZ;

    if (testingExpected) {
      switch (currentPref.charAt(currentPref.length - 1)) {
        case "x":
          expectedDeltaX *= currentMultiplier;
          break;
        case "y":
          expectedDeltaY *= currentMultiplier;
          break;
        case "z":
          expectedDeltaZ *= currentMultiplier;
          break;
      }
    } else if (aEvent.isTrusted && aEvent.deltaMode == WheelEvent.DOM_DELTA_LINE) {
      expectedDeltaX *= defaultScrollMultiplier(true);
      expectedDeltaY *= defaultScrollMultiplier(false);
    }
    is(aEvent.deltaMode, currentEvent.deltaMode, description + "deltaMode (" + currentEvent.deltaMode + ") was invalid");
    is(aEvent.deltaX, expectedDeltaX, description + "deltaX (" + currentEvent.deltaX + ") was invalid");
    is(aEvent.deltaY, expectedDeltaY, description + "deltaY (" + currentEvent.deltaY + ") was invalid");
    is(aEvent.deltaZ, expectedDeltaZ, description + "deltaZ (" + currentEvent.deltaZ + ") was invalid");
    is(aEvent.wheelDeltaX, -Math.round(aEvent.isTrusted ? 3 * deltaToPixels(aEvent.deltaMode, expectedDeltaX, true) : expectedDeltaX), `${description}wheelDeltaX (${aEvent.wheelDeltaX}) was invalid`);
    is(aEvent.wheelDeltaY, -Math.round(aEvent.isTrusted ? 3 * deltaToPixels(aEvent.deltaMode, expectedDeltaY, false) : expectedDeltaY), `${description}wheelDeltaY (${aEvent.wheelDeltaY}) was invalid`);
    is(aEvent.wheelDelta, aEvent.wheelDeltaY || aEvent.wheelDeltaX, description + "wheelDelta was invalid");

    if (expectedAsyncHandlerCalls > 0 && --expectedAsyncHandlerCalls == 0) {
      setTimeout(continueTest, 0);
    }
  }

  function legacyEventHandler(aEvent) {
    var isHorizontal = (aEvent.axis == MouseScrollEvent.HORIZONTAL_AXIS);
    var isScrollEvent = (aEvent.type == "DOMMouseScroll");
    if (isScrollEvent) {
      if (isHorizontal) {
        calledHandlers.DOMMouseScroll.horizontal = true;
      } else {
        calledHandlers.DOMMouseScroll.vertical = true;
      }
    } else {
      if (isHorizontal) {
        calledHandlers.MozMousePixelScroll.horizontal = true;
      } else {
        calledHandlers.MozMousePixelScroll.vertical = true;
      }
    }
    var eventName = (isHorizontal ? "Horizontal " : "Vertical ") + aEvent.type + " ";
    var expectedDetail;
    if (isScrollEvent) {
      expectedDetail = isHorizontal ? currentEvent.lineOrPageDeltaX : currentEvent.lineOrPageDeltaY;
      if (currentEvent.deltaMode == WheelEvent.DOM_DELTA_PAGE && expectedDetail) {
        expectedDetail = ((expectedDetail > 0) ? UIEvent.SCROLL_PAGE_DOWN : UIEvent.SCROLL_PAGE_UP);
      }
    } else {
      expectedDetail = isHorizontal ? currentEvent.deltaX : currentEvent.deltaY;
      if (expectedDetail) {
        if (currentEvent.deltaMode == WheelEvent.DOM_DELTA_LINE) {
          expectedDetail *= (isHorizontal ? gHorizontalLine : gLineHeight);
        } else if (currentEvent.deltaMode == WheelEvent.DOM_DELTA_PAGE) {
          if (expectedDetail > 0) {
            expectedDetail = (isHorizontal ? gPageWidth : gPageHeight);
          } else {
            expectedDetail = (isHorizontal ? -gPageWidth : -gPageHeight);
          }
        }
      }
    }
    if (testingExpected) {
      if ((isHorizontal && currentPref.charAt(currentPref.length - 1) == "x") ||
          (!isHorizontal && currentPref.charAt(currentPref.length - 1) == "y")) {
        // If it's a page scroll event, the detail value is UIEvent.SCROLL_PAGE_DOWN or
        // UIEvent.SCROLL_PAGE_UP.  If the delta value sign is reverted, we need to
        // revert the expected detail value too.  Otherwise, don't touch it.
        if (isScrollEvent && currentEvent.deltaMode == WheelEvent.DOM_DELTA_PAGE) {
          if (currentMultiplier < 0) {
            expectedDetail = ((expectedDetail == UIEvent.SCROLL_PAGE_UP) ? UIEvent.SCROLL_PAGE_DOWN : UIEvent.SCROLL_PAGE_UP);
          }
        } else {
          expectedDetail *= currentMultiplier;
          expectedDetail = expectedDetail < 0 ? Math.ceil(expectedDetail) : Math.floor(expectedDetail);
        }
      }
    }
    is(aEvent.detail, expectedDetail, description + eventName + "detail was invalid");

    aEvent.preventDefault();

    if (expectedAsyncHandlerCalls > 0 && --expectedAsyncHandlerCalls == 0) {
      setTimeout(continueTest, 0);
    }
  }

  window.addEventListener("wheel", wheelEventHandler, true);
  window.addEventListener("DOMMouseScroll", legacyEventHandler, true);
  window.addEventListener("MozMousePixelScroll", legacyEventHandler, true);

  function* dispatchEvent(aIsExpected) {
    for (var i = 0; i < kEvents.length; i++) {
      currentEvent = kEvents[i];
      currentEvent.shiftKey = (currentModifiers & kModifierShift) != 0;
      currentEvent.ctrlKey  = (currentModifiers & kModifierControl) != 0;
      currentEvent.altKey   = (currentModifiers & kModifierAlt) != 0;
      currentEvent.metaKey  = (currentModifiers & kModifierMeta) != 0;
      currentEvent.osKey    = (currentModifiers & kModifierWin) != 0;
      var modifierList = "";
      if (currentEvent.shiftKey) {
        modifierList += "Shift ";
      }
      if (currentEvent.ctrlKey) {
        modifierList += "Control ";
      }
      if (currentEvent.altKey) {
        modifierList += "Alt ";
      }
      if (currentEvent.metaKey) {
        modifierList += "Meta ";
      }
      if (currentEvent.osKey) {
        modifierList += "Win ";
      }

      for (var j = 0; j < kPrefValues.length; j++) {
        currentMultiplier = kPrefValues[j] / 100;
        for (var k = 0; k < kDeltaMultiplierPrefs.length; k++) {
          currentPref = "mousewheel." + currentTest.name + "." + kDeltaMultiplierPrefs[k];

          yield SpecialPowers.pushPrefEnv({"set": [[currentPref, kPrefValues[j]]]}, continueTest);

          gScrollableElement.scrollTop = gScrollableElement.scrollBottom = 1000;

          // trusted event's delta valuses should be reverted by the pref.
          testingExpected = aIsExpected;

          var expectedProps = {
            deltaX: currentEvent.deltaX * currentMultiplier,
            deltaY: currentEvent.deltaY * currentMultiplier,
            dletaZ: currentEvent.deltaZ * currentMultiplier,
            lineOrPageDeltaX: currentEvent.lineOrPageDeltaX * currentMultiplier,
            lineOrPageDeltaY: currentEvent.lineOrPageDeltaY * currentMultiplier,
          };

          var expectedWheel = expectedProps.deltaX != 0 || expectedProps.deltaY != 0 || expectedProps.deltaZ != 0;
          var expectedDOMMouseX = expectedProps.lineOrPageDeltaX >= 1 || expectedProps.lineOrPageDeltaX <= -1;
          var expectedDOMMouseY = expectedProps.lineOrPageDeltaY >= 1 || expectedProps.lineOrPageDeltaY <= -1;
          var expectedMozMouseX = expectedProps.deltaX >= 1 || expectedProps.deltaX <= -1;
          var expectedMozMouseY = expectedProps.deltaY >= 1 || expectedProps.deltaY <= -1;

          expectedAsyncHandlerCalls = 0;
          if (expectedWheel) ++expectedAsyncHandlerCalls;
          if (expectedDOMMouseX) ++expectedAsyncHandlerCalls;
          if (expectedDOMMouseY) ++expectedAsyncHandlerCalls;
          if (expectedMozMouseX) ++expectedAsyncHandlerCalls;
          if (expectedMozMouseY) ++expectedAsyncHandlerCalls;

          description = "testDeltaMultiplierPrefs, pref: " + currentPref + "=" + kPrefValues[j] +
            ", deltaMode: " + currentEvent.deltaMode + ", modifiers: \"" + modifierList + "\", (trusted event): ";
          yield synthesizeWheel(gScrollableElement, 10, 10, currentEvent);

          is(calledHandlers.wheel,
             expectedWheel,
             description + "wheel event was (not) fired");
          is(calledHandlers.DOMMouseScroll.horizontal,
             expectedDOMMouseX,
             description + "Horizontal DOMMouseScroll event was (not) fired");
          is(calledHandlers.DOMMouseScroll.vertical,
             expectedDOMMouseY,
             description + "Vertical DOMMouseScroll event was (not) fired");
          is(calledHandlers.MozMousePixelScroll.horizontal,
             expectedMozMouseX,
             description + "Horizontal MozMousePixelScroll event was (not) fired");
          is(calledHandlers.MozMousePixelScroll.vertical,
             expectedMozMouseY,
             description + "Vertical MozMousePixelScroll event was (not) fired");

          calledHandlers = { wheel: false,
                             DOMMouseScroll: { horizontal: false, vertical: false },
                             MozMousePixelScroll: { horizontal: false, vertical: false } };

          // untrusted event's delta values shouldn't be reverted by the pref.
          testingExpected = false;
          var props = {
            bubbles: true,
            cancelable: true,
            shiftKey: currentEvent.shiftKey,
            ctrlKey: currentEvent.ctrlKey,
            altKey: currentEvent.altKey,
            metaKey: currentEvent.metaKey,
            deltaX: currentEvent.deltaX,
            deltaY: currentEvent.deltaY,
            deltaZ: currentEvent.deltaZ,
            deltaMode: currentEvent.deltaMode,
          };
          var untrustedEvent = new WheelEvent("wheel", props);

          description = "testDeltaMultiplierPrefs, pref: " + currentPref + "=" + kPrefValues[j] +
            ", deltaMode: " + currentEvent.deltaMode + ", modifiers: \"" + modifierList + "\", (untrusted event): ";
          gScrollableElement.dispatchEvent(untrustedEvent);

          ok(calledHandlers.wheel, description + "wheel event was not fired for untrusted event");
          ok(!calledHandlers.DOMMouseScroll.horizontal,
             description + "Horizontal DOMMouseScroll event was fired for untrusted event");
          ok(!calledHandlers.DOMMouseScroll.vertical,
             description + "Vertical DOMMouseScroll event was fired for untrusted event");
          ok(!calledHandlers.MozMousePixelScroll.horizontal,
             description + "Horizontal MozMousePixelScroll event was fired for untrusted event");
          ok(!calledHandlers.MozMousePixelScroll.vertical,
             description + "Vertical MozMousePixelScroll event was fired for untrusted event");

          yield SpecialPowers.pushPrefEnv({"set": [[currentPref, 100]]}, continueTest);

          calledHandlers = { wheel: false,
                             DOMMouseScroll: { horizontal: false, vertical: false },
                             MozMousePixelScroll: { horizontal: false, vertical: false } };

        }
        // We should skip other value tests if testing with modifier key.
        // If we didn't do so, it would test too many times, but we don't need to do so.
        if (kTests.name != "default") {
          break;
        }
      }
    }
  }

  for (var i = 0; i < kTests.length; i++) {
    currentTest = kTests[i];
    for (var j = 0; j < currentTest.expected.length; j++) {
      currentModifiers = currentTest.expected[j];
      yield* dispatchEvent(true);
    }
    for (var k = 0; k < currentTest.unexpected.length; k++) {
      currentModifiers = currentTest.unexpected[k];
      yield* dispatchEvent(false);
    }
  }

  window.removeEventListener("wheel", wheelEventHandler, true);
  window.removeEventListener("DOMMouseScroll", legacyEventHandler, true);
  window.removeEventListener("MozMousePixelScroll", legacyEventHandler, true);
}

// Untrusted wheel events shouldn't cause legacy mouse scroll events.
function testDispatchingUntrustEvent()
{
  var descriptionBase = "testDispatchingUntrustEvent, ";
  var description, wheelEventFired;
  function wheelEventHandler(aEvent)
  {
    wheelEventFired = true;
  }

  function legacyEventHandler(aEvent)
  {
    ok(false, aEvent.type + " must not be fired");
  }

  window.addEventListener("wheel", wheelEventHandler, true);
  window.addEventListener("DOMMouseScroll", legacyEventHandler, true);
  window.addEventListener("MozMousePixelScroll", legacyEventHandler, true);

  description = descriptionBase + "dispatching a pixel wheel event: ";
  wheelEventFired = false;
  var untrustedPixelEvent = new WheelEvent("wheel", {
    bubbles: true, cancelable: true,
    deltaX: 24.0, deltaY: 24.0,
    deltaMode: WheelEvent.DOM_DELTA_PIXEL,
  });
  gScrolledElement.dispatchEvent(untrustedPixelEvent);
  ok(wheelEventFired, description + "wheel event wasn't fired");

  description = descriptionBase + "dispatching a line wheel event: ";
  wheelEventFired = false;
  var untrustedLineEvent = new WheelEvent("wheel", {
    bubbles: true, cancelable: true,
    deltaX: 3.0, deltaY: 3.0,
    deltaMode: WheelEvent.DOM_DELTA_LINE,
  });
  gScrolledElement.dispatchEvent(untrustedLineEvent);
  ok(wheelEventFired, description + "wheel event wasn't fired");

  description = descriptionBase + "dispatching a page wheel event: ";
  wheelEventFired = false;
  var untrustedPageEvent = new WheelEvent("wheel", {
    bubbles: true, cancelable: true,
    deltaX: 1.0, deltaY: 1.0,
    deltaMode: WheelEvent.DOM_DELTA_PAGE,
  });
  gScrolledElement.dispatchEvent(untrustedPageEvent);
  ok(wheelEventFired, description + "wheel event wasn't fired");

  window.removeEventListener("wheel", wheelEventHandler, true);
  window.removeEventListener("DOMMouseScroll", legacyEventHandler, true);
  window.removeEventListener("MozMousePixelScroll", legacyEventHandler, true);
}

function* testEventOrder()
{
  const kWheelEvent                         = 0x0001;
  const kDOMMouseScrollEvent                = 0x0002;
  const kMozMousePixelScrollEvent           = 0x0004;
  const kVerticalScrollEvent                = 0x0010;
  const kHorizontalScrollEvent              = 0x0020;
  const kInSystemGroup                      = 0x0100;
  const kDefaultPrevented                   = 0x1000;

  var currentTest;

  const kTests = [
    {
      description: "Testing the order of the events without preventDefault()",
      expectedEvents: [ kWheelEvent,
                        kDOMMouseScrollEvent | kVerticalScrollEvent,
                        kDOMMouseScrollEvent | kVerticalScrollEvent | kInSystemGroup,
                        kMozMousePixelScrollEvent | kVerticalScrollEvent,
                        kMozMousePixelScrollEvent | kVerticalScrollEvent | kInSystemGroup,
                        kDOMMouseScrollEvent | kHorizontalScrollEvent,
                        kDOMMouseScrollEvent | kHorizontalScrollEvent | kInSystemGroup,
                        kMozMousePixelScrollEvent | kHorizontalScrollEvent,
                        kMozMousePixelScrollEvent | kHorizontalScrollEvent | kInSystemGroup,
                        kWheelEvent | kInSystemGroup],
      resultEvents: [],
      doPreventDefaultAt: 0,
    },
    {
      description: "Testing the order of the events, calling preventDefault() at default group wheel event",
      expectedEvents: [ kWheelEvent,
                        kWheelEvent | kInSystemGroup | kDefaultPrevented],
      resultEvents: [],
      doPreventDefaultAt: kWheelEvent,
    },
    {
      description: "Testing the order of the events, calling preventDefault() at default group DOMMouseScroll event",
      expectedEvents: [ kWheelEvent,
                        kDOMMouseScrollEvent | kVerticalScrollEvent,
                        kDOMMouseScrollEvent | kVerticalScrollEvent | kInSystemGroup | kDefaultPrevented,
                        kMozMousePixelScrollEvent | kVerticalScrollEvent | kDefaultPrevented,
                        kMozMousePixelScrollEvent | kVerticalScrollEvent | kInSystemGroup | kDefaultPrevented,
                        kDOMMouseScrollEvent | kHorizontalScrollEvent,
                        kDOMMouseScrollEvent | kHorizontalScrollEvent | kInSystemGroup,
                        kMozMousePixelScrollEvent | kHorizontalScrollEvent,
                        kMozMousePixelScrollEvent | kHorizontalScrollEvent | kInSystemGroup,
                        kWheelEvent | kInSystemGroup | kDefaultPrevented],
      resultEvents: [],
      doPreventDefaultAt: kDOMMouseScrollEvent | kVerticalScrollEvent,
    },
    {
      description: "Testing the order of the events, calling preventDefault() at default group MozMousePixelScroll event",
      expectedEvents: [ kWheelEvent,
                        kDOMMouseScrollEvent | kVerticalScrollEvent,
                        kDOMMouseScrollEvent | kVerticalScrollEvent | kInSystemGroup,
                        kMozMousePixelScrollEvent | kVerticalScrollEvent,
                        kMozMousePixelScrollEvent | kVerticalScrollEvent | kInSystemGroup | kDefaultPrevented,
                        kDOMMouseScrollEvent | kHorizontalScrollEvent,
                        kDOMMouseScrollEvent | kHorizontalScrollEvent | kInSystemGroup,
                        kMozMousePixelScrollEvent | kHorizontalScrollEvent,
                        kMozMousePixelScrollEvent | kHorizontalScrollEvent | kInSystemGroup,
                        kWheelEvent | kInSystemGroup | kDefaultPrevented],
      resultEvents: [],
      doPreventDefaultAt: kMozMousePixelScrollEvent | kVerticalScrollEvent,
    },
    {
      description: "Testing the order of the events, calling preventDefault() at system group DOMMouseScroll event",
      expectedEvents: [ kWheelEvent,
                        kDOMMouseScrollEvent | kVerticalScrollEvent,
                        kDOMMouseScrollEvent | kVerticalScrollEvent | kInSystemGroup,
                        kMozMousePixelScrollEvent | kVerticalScrollEvent | kDefaultPrevented,
                        kMozMousePixelScrollEvent | kVerticalScrollEvent | kInSystemGroup | kDefaultPrevented,
                        kDOMMouseScrollEvent | kHorizontalScrollEvent,
                        kDOMMouseScrollEvent | kHorizontalScrollEvent | kInSystemGroup,
                        kMozMousePixelScrollEvent | kHorizontalScrollEvent,
                        kMozMousePixelScrollEvent | kHorizontalScrollEvent | kInSystemGroup,
                        kWheelEvent | kInSystemGroup | kDefaultPrevented],
      resultEvents: [],
      doPreventDefaultAt: kDOMMouseScrollEvent | kVerticalScrollEvent | kInSystemGroup,
    },
    {
      description: "Testing the order of the events, calling preventDefault() at system group MozMousePixelScroll event",
      expectedEvents: [ kWheelEvent,
                        kDOMMouseScrollEvent | kVerticalScrollEvent,
                        kDOMMouseScrollEvent | kVerticalScrollEvent | kInSystemGroup,
                        kMozMousePixelScrollEvent | kVerticalScrollEvent,
                        kMozMousePixelScrollEvent | kVerticalScrollEvent | kInSystemGroup,
                        kDOMMouseScrollEvent | kHorizontalScrollEvent,
                        kDOMMouseScrollEvent | kHorizontalScrollEvent | kInSystemGroup,
                        kMozMousePixelScrollEvent | kHorizontalScrollEvent,
                        kMozMousePixelScrollEvent | kHorizontalScrollEvent | kInSystemGroup,
                        kWheelEvent | kInSystemGroup | kDefaultPrevented],
      resultEvents: [],
      doPreventDefaultAt: kMozMousePixelScrollEvent | kVerticalScrollEvent | kInSystemGroup,
    },
  ];

  function getEventDescription(aEvent)
  {
    var result = "";
    if (aEvent & kWheelEvent) {
      result = "wheel"
    } else {
      if (aEvent & kDOMMouseScrollEvent) {
        result = "DOMMouseScroll";
      } else if (aEvent & kMozMousePixelScrollEvent) {
        result = "MozMousePixelScroll";
      }
      if (aEvent & kVerticalScrollEvent) {
        result += ", vertical";
      } else {
        result += ", horizontal";
      }
    }
    if (aEvent & kInSystemGroup) {
      result += ", system group";
    }
    if (aEvent & kDefaultPrevented) {
      result += ", defaultPrevented";
    }
    return result;
  }

  function pushEvent(aEvent, aIsSystemGroup)
  {
    var event = 0;
    if (aEvent.type == "wheel") {
      event = kWheelEvent;
    } else {
      if (aEvent.type == "DOMMouseScroll") {
        event = kDOMMouseScrollEvent;
      } else if (aEvent.type == "MozMousePixelScroll") {
        event = kMozMousePixelScrollEvent;
      }
      if (aEvent.axis == MouseScrollEvent.HORIZONTAL_AXIS) {
        event |= kHorizontalScrollEvent;
      } else {
        event |= kVerticalScrollEvent;
      }
    }
    if (aIsSystemGroup) {
      event |= kInSystemGroup;
    }
    if (aEvent.defaultPrevented) {
      event |= kDefaultPrevented;
    }
    currentTest.resultEvents.push(event);

    if (event == currentTest.doPreventDefaultAt) {
      aEvent.preventDefault();
    }

    if (currentTest.resultEvents.length == currentTest.expectedEvents.length) {
      setTimeout(continueTest, 0);
    }
  }

  function handler(aEvent)
  {
    pushEvent(aEvent, false);
  }

  function systemHandler(aEvent)
  {
    pushEvent(aEvent, true);
  }

  window.addEventListener("wheel", handler, { capture: true, passive: false });
  window.addEventListener("DOMMouseScroll", handler, { capture: true, passive: false });
  window.addEventListener("MozMousePixelScroll", handler, { capture: true, passive: false });

  SpecialPowers.addSystemEventListener(window, "wheel", systemHandler, true);
  SpecialPowers.addSystemEventListener(window, "DOMMouseScroll", systemHandler, true);
  SpecialPowers.addSystemEventListener(window, "MozMousePixelScroll", systemHandler, true);

  for (var i = 0; i < kTests.length; i++) {
    currentTest = kTests[i];
    yield synthesizeWheel(gScrollableElement, 10, 10,
                          { deltaMode: WheelEvent.DOM_DELTA_LINE, deltaX: 1.0, deltaY: 1.0 });

    for (var j = 0; j < currentTest.expectedEvents.length; j++) {
      if (currentTest.resultEvents.length == j) {
        ok(false, currentTest.description + ": " +
           getEventDescription(currentTest.expectedEvents[j]) + " wasn't fired");
        break;
      }
      is(getEventDescription(currentTest.resultEvents[j]),
         getEventDescription(currentTest.expectedEvents[j]),
         currentTest.description + ": " + (j + 1) + "th event is mismatched");
    }
    if (currentTest.expectedEvents.length < currentTest.resultEvents.length) {
      ok(false, currentTest.description + ": " +
         getEventDescription(currentTest.resultEvents[currentTest.expectedEvents.length]) +
         " was fired unexpectedly");
    }
  }

  window.removeEventListener("wheel", handler, true);
  window.removeEventListener("DOMMouseScroll", handler, true);
  window.removeEventListener("MozMousePixelScroll", handler, true);

  SpecialPowers.removeSystemEventListener(window, "wheel", systemHandler, true);
  SpecialPowers.removeSystemEventListener(window, "DOMMouseScroll", systemHandler, true);
  SpecialPowers.removeSystemEventListener(window, "MozMousePixelScroll", systemHandler, true);
}

var gOnWheelAttrHandled = new Array;
var gOnWheelAttrCount = 0;

function* testOnWheelAttr()
{
  function onWheelHandledString(attr) {
    return `gOnWheelAttrHandled['${attr}'] = true;
            ++gOnWheelAttrCount;
            if (gOnWheelAttrCount == 3) {
              setTimeout(continueTest, 0);
            };`;
  }

  document.documentElement.setAttribute("onwheel", onWheelHandledString("html"));
  document.body.setAttribute("onwheel", onWheelHandledString("body"));
  gScrollableElement.setAttribute("onwheel", onWheelHandledString("div"));
  var target = document.getElementById("onwheel");
  yield synthesizeWheel(gScrollableElement, 10, 10,
                        { deltaMode: WheelEvent.DOM_DELTA_LINE,
                        deltaX: 1.0, deltaY: 2.0 });
  ok(gOnWheelAttrHandled.html, "html element's onwheel attribute isn't performed");
  ok(gOnWheelAttrHandled.body, "body element's onwheel attribute isn't performed");
  ok(gOnWheelAttrHandled.div, "div element's onwheel attribute isn't performed");
}

var gOnWheelPropHandled = new Array;
var gOnWheelPropCount = 0;

function* testOnWheelProperty()
{
  const handleOnWheelProp = prop => e => {
    gOnWheelPropHandled[prop] = true;
    ++gOnWheelPropCount;
    if (gOnWheelPropCount == 5) {
      setTimeout(continueTest, 0);
    }
  }

  window.onwheel = handleOnWheelProp('window');
  document.onwheel = handleOnWheelProp('document');
  document.documentElement.onwheel = handleOnWheelProp('html');
  document.body.onwheel = handleOnWheelProp('body');
  gScrollableElement.onwheel = handleOnWheelProp('div');

  var target = document.getElementById("onwheel");
  yield synthesizeWheel(gScrollableElement, 10, 10,
                        { deltaMode: WheelEvent.DOM_DELTA_LINE,
                          deltaX: 1.0, deltaY: 2.0 });

  ok(gOnWheelPropHandled.window, "window's onwheel property isn't performed");
  ok(gOnWheelPropHandled.document, "document's onwheel property isn't performed");
  ok(gOnWheelPropHandled.html, "html element's onwheel property isn't performed");
  ok(gOnWheelPropHandled.body, "body element's onwheel property isn't performed");
  ok(gOnWheelPropHandled.div, "div element's onwheel property isn't performed");
}

function* testBody()
{
  yield* prepareScrollUnits();
  testMakingUntrustedEvent();
  yield* testDeltaMultiplierPrefs();
  testDispatchingUntrustEvent();
  yield* testEventOrder();
  yield* testOnWheelAttr();
  yield* testOnWheelProperty();
}

var gTestContinuation = null;

function continueTest()
{
  if (!gTestContinuation) {
    gTestContinuation = testBody();
  }
  var ret = gTestContinuation.next();
  if (ret.done) {
    SimpleTest.finish();
  }
}

function runTest()
{
  SpecialPowers.pushPrefEnv({"set": [
    // FIXME(emilio): This test is broken in HiDPI, unclear if
    // MozMousePixelScroll is not properly converting to CSS pixels, or
    // whether sendWheelAndWait expectes device rather than CSS pixels, or
    // something else.
    ["layout.css.devPixelsPerPx", 1.0],

    ["dom.event.wheel-deltaMode-lines.disabled", true],

    ["mousewheel.default.delta_multiplier_x", 100],
    ["mousewheel.default.delta_multiplier_y", 100],
    ["mousewheel.default.delta_multiplier_z", 100],
    ["mousewheel.with_alt.delta_multiplier_x", 100],
    ["mousewheel.with_alt.delta_multiplier_y", 100],
    ["mousewheel.with_alt.delta_multiplier_z", 100],
    ["mousewheel.with_control.delta_multiplier_x", 100],
    ["mousewheel.with_control.delta_multiplier_y", 100],
    ["mousewheel.with_control.delta_multiplier_z", 100],
    ["mousewheel.with_meta.delta_multiplier_x", 100],
    ["mousewheel.with_meta.delta_multiplier_y", 100],
    ["mousewheel.with_meta.delta_multiplier_z", 100],
    ["mousewheel.with_shift.delta_multiplier_x", 100],
    ["mousewheel.with_shift.delta_multiplier_y", 100],
    ["mousewheel.with_shift.delta_multiplier_z", 100],
    ["mousewheel.with_win.delta_multiplier_x", 100],
    ["mousewheel.with_win.delta_multiplier_y", 100],
    ["mousewheel.with_win.delta_multiplier_z", 100],
    // TODO: Need to add passive to SpecialPowers.addSystemEventListener
    // somehow.
    ["dom.event.default_to_passive_wheel_listeners", false],
  ]}, continueTest);
}
</script>
</pre>
</body>
</html>
