dom/events/test/test_bug574663.html

   1 <!DOCTYPE HTML>
   2 <html>
   3 <!--
   4 https://bugzilla.mozilla.org/show_bug.cgi?id=574663
   5 -->
   6 <head>
   7   <title>Test for Bug 574663</title>
   8   <script src="/tests/SimpleTest/SimpleTest.js"></script>
   9   <script src="/tests/SimpleTest/EventUtils.js"></script>
  10   <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
  11 </head>
  12 <body>
  13 <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=574663">Mozilla Bug 574663</a>
  14 <p id="display"></p>
  15 <div id="content" style="display: none">
  16
  17 </div>
  18 <pre id="test">
  19 <script>
  20
  21 /** Test for Bug 574663 **/
  22
  23 // SimpleTest's paint_listener does not work on other windows, so we inline
  24 // a smaller version here.
  25 function waitForPaint(win, utils, callback) {
  26   win.document.documentElement.getBoundingClientRect();
  27   if (!utils.isMozAfterPaintPending) {
  28     win.requestAnimationFrame(function() {
  29       setTimeout(callback);
  30     });
  31     return;
  32   }
  33
  34   var onpaint = function() {
  35     if (!utils.isMozAfterPaintPending) {
  36       win.removeEventListener("MozAfterPaint", onpaint);
  37       callback();
  38       return;
  39     }
  40     if (utils.isTestControllingRefreshes) {
  41       utils.advanceTimeAndRefresh(0);
  42     }
  43   }
  44   win.addEventListener("MozAfterPaint", onpaint);
  45   if (utils.isTestControllingRefreshes) {
  46     utils.advanceTimeAndRefresh(0);
  47   }
  48 }
  49
  50 // This is a magic number representing how many device pixels we are attempting to
  51 // scroll or zoom.  We use it for sending the wheel events, but we don't actually
  52 // check that we have scrolled by that amount.
  53 var kDelta = 3;
  54
  55 function sendTouchpadScrollMotion(scrollbox, direction, ctrl, momentum, callback) {
  56   var win = scrollbox.ownerDocument.defaultView;
  57   let winUtils = SpecialPowers.getDOMWindowUtils(win);
  58
  59   let event = {
  60     deltaMode: WheelEvent.DOM_DELTA_PIXEL,
  61     deltaY: direction * kDelta,
  62     lineOrPageDeltaY: direction,
  63     ctrlKey: ctrl,
  64     isMomentum: momentum
  65   };
  66
  67   // Construct a promise that will resolve when either scroll or zoom has changed.
  68   // --- Intermittent Warning ---
  69   // Two wheel events are sent, but our promise resolves when any change has been
  70   // made to scroll or zoom. That makes it possible that the effect of the second
  71   // event may not yet be applied when the promise resolves. This shouldn't lead
  72   // to any errors, since the two wheel events are moving in the same direction,
  73   // and our later checks will only ensure that the value has changed from its
  74   // initial value. This was done intentionally, because attempting to wait after
  75   // both events yields problems when the second event has no effect, which does
  76   // happen in testing. It's not clear why this is happening. Since the testing
  77   // pattern is scroll (twice), then scroll back (twice), it's possible that the
  78   // first scroll back event is sufficient to return the scrollbox to its minimal
  79   // scrollTop position, and so the second event doesn't scroll any further.
  80   const initialZoom = SpecialPowers.getFullZoom(win);
  81   const initialScroll = scrollbox.scrollTop;
  82
  83   const effectOfWheelEvent = SimpleTest.promiseWaitForCondition(() => {
  84     return ((SpecialPowers.getFullZoom(win) != initialZoom) || (scrollbox.scrollTop != initialScroll));
  85   }, "Mouse wheel should have caused us to either zoom or scroll.");
  86
  87   synthesizeWheel(scrollbox, 10, 10, event, win);
  88
  89   // then additional pixel scroll
  90   event.lineOrPageDeltaY = 0;
  91   synthesizeWheel(scrollbox, 10, 10, event, win);
  92
  93   effectOfWheelEvent.then(callback);
  94 }
  95
  96 function runTest() {
  97   var win = open('bug574663.html', '_blank', 'width=300,height=300');
  98   let winUtils = SpecialPowers.getDOMWindowUtils(win);
  99
 100   let waitUntilPainted = function(callback) {
 101     // Until the first non-blank paint, the parent will set the opacity of our
 102     // browser to 0 using the 'blank' attribute.
 103     // Until the blank attribute is removed, we can't send scroll events.
 104     SimpleTest.waitForFocus(function() {
 105       /* eslint-disable no-shadow */
 106       let chromeScript = SpecialPowers.loadChromeScript(_ => {
 107         /* eslint-env mozilla/chrome-script */
 108         let win = Services.wm.getMostRecentWindow("navigator:browser");
 109         win.requestAnimationFrame(() => {
 110           win.gBrowser.selectedBrowser.removeAttribute("blank");
 111           win.requestAnimationFrame(() => {
 112             sendAsyncMessage("blank-attribute-removed");
 113           });
 114         });
 115       });
 116       /* eslint-enable no-shadow */
 117       chromeScript.promiseOneMessage("blank-attribute-removed").then(() => {
 118         chromeScript.destroy();
 119         waitForPaint(win, winUtils, callback);
 120       });
 121     }, win);
 122   };
 123
 124   waitUntilPainted(function () {
 125     var scrollbox = win.document.getElementById("scrollbox");
 126     let outstandingTests = [
 127       [false, false],
 128       [false, true],
 129       [true, false],
 130       [true, true],
 131     ];
 132
 133     // grab the refresh driver, since we want to make sure
 134     // async scrolls happen in deterministic time
 135     winUtils.advanceTimeAndRefresh(1000);
 136
 137     function nextTest() {
 138       let [ctrlKey, isMomentum] = outstandingTests.shift();
 139       let scrollTopBefore = scrollbox.scrollTop;
 140       let zoomFactorBefore = SpecialPowers.getFullZoom(win);
 141
 142       let check = function() {
 143         if (!ctrlKey) {
 144           let postfix = isMomentum ? ", even after releasing the touchpad" : "";
 145           // Normal scroll: scroll
 146           is(SpecialPowers.getFullZoom(win), zoomFactorBefore, "Normal scrolling shouldn't change zoom" + postfix);
 147           isnot(scrollbox.scrollTop, scrollTopBefore,
 148              "Normal scrolling should scroll" + postfix);
 149         } else {
 150           if (!isMomentum) {
 151             isnot(SpecialPowers.getFullZoom(win), zoomFactorBefore, "Ctrl-scrolling should zoom while the user is touching the touchpad");
 152             is(scrollbox.scrollTop, scrollTopBefore, "Ctrl-scrolling shouldn't scroll while the user is touching the touchpad");
 153           } else {
 154             is(SpecialPowers.getFullZoom(win), zoomFactorBefore, "Momentum scrolling shouldn't zoom, even when pressing Ctrl");
 155             isnot(scrollbox.scrollTop, scrollTopBefore,
 156                "Momentum scrolling should scroll, even when pressing Ctrl");
 157           }
 158         }
 159
 160         if (!outstandingTests.length) {
 161           winUtils.restoreNormalRefresh();
 162           win.close();
 163           SimpleTest.finish();
 164           return;
 165         }
 166
 167         // Revert the effect for the next test.
 168         sendTouchpadScrollMotion(scrollbox, -1, ctrlKey, isMomentum, function() {
 169           setTimeout(nextTest, 0);
 170         });
 171       }
 172
 173       sendTouchpadScrollMotion(scrollbox, 1, ctrlKey, isMomentum, check);
 174     }
 175     nextTest();
 176   });
 177 }
 178
 179 window.onload = function() {
 180   SpecialPowers.pushPrefEnv({
 181     "set":[["general.smoothScroll", false],
 182            ["mousewheel.acceleration.start", -1],
 183            ["mousewheel.system_scroll_override.enabled", false],
 184            ["mousewheel.with_control.action", 3],
 185            ["test.events.async.enabled", true]]}, runTest);
 186 }
 187
 188 SimpleTest.waitForExplicitFinish();
 189
 190 </script>
 191 </pre>
 192
 193 </body>
 194 </html>