Bug 1525570 - Add a test for preventDefault on pinch zooms. r=botond

Differential Revision: https://phabricator.services.mozilla.com/D21421 --HG-- extra : moz-landing-system : lando

Bug 1525570 - Add a test for preventDefault on pinch zooms. r=botond
Differential Revision: https://phabricator.services.mozilla.com/D21421 --HG-- extra : moz-landing-system : lando
885a3e0d · Kartikaya Gupta · 9e38acbf · 885a3e0d · 885a3e0d
Commit 885a3e0d authored Feb 28, 2019 by Kartikaya Gupta
--- a/gfx/layers/apz/test/mochitest/helper_zoom_prevented.html
+++ b/gfx/layers/apz/test/mochitest/helper_zoom_prevented.html
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width">
+  <title>Checking prevent-default for zooming</title>
+  <script type="application/javascript" src="apz_test_native_event_utils.js"></script>
+  <script type="application/javascript" src="apz_test_utils.js"></script>
+  <script type="application/javascript" src="/tests/SimpleTest/paint_listener.js"></script>
+  <script type="application/javascript">
+
+function* testPreventDefault(testDriver, aTouchStartToCancel) {
+  var initial_resolution = getResolution();
+  ok(initial_resolution > 0,
+      "The initial_resolution is " + initial_resolution + ", which is some sane value");
+
+  // preventDefault exactly one touchstart based on the value of aTouchStartToCancel
+  var touchStartCount = 0;
+  var canceller = function(e) {
+    dump("touchstart listener hit, count: " + touchStartCount + "\n");
+    touchStartCount++;
+    if (touchStartCount == aTouchStartToCancel) {
+      dump("calling preventDefault on touchstart\n");
+      e.preventDefault();
+      document.documentElement.removeEventListener("touchstart", canceller, {passive: false});
+    }
+  };
+  document.documentElement.addEventListener("touchstart", canceller, {passive: false});
+
+  // Ensure that APZ gets updated hit-test info
+  yield waitForAllPaints(testDriver);
+
+  var zoom_in = [
+      [ { x: 125, y: 250 }, { x: 175, y: 350 } ],
+      [ { x: 120, y: 220 }, { x: 180, y: 380 } ],
+      [ { x: 115, y: 190 }, { x: 185, y: 410 } ],
+      [ { x: 110, y: 160 }, { x: 190, y: 440 } ],
+      [ { x: 105, y: 130 }, { x: 195, y: 470 } ],
+      [ { x: 100, y: 100 }, { x: 200, y: 500 } ],
+  ];
+
+  var touchIds = [0, 1];
+  yield* synthesizeNativeTouchSequences(document.body, zoom_in, null, touchIds);
+
+  // Flush state and get the resolution we're at now
+  yield waitForApzFlushedRepaints(testDriver);
+  let final_resolution = getResolution();
+  is(final_resolution, initial_resolution, "The final resolution (" + final_resolution + ") matches the initial resolution");
+}
+
+function* test(testDriver) {
+  // Register a listener that fails the test if the APZ:TransformEnd event fires,
+  // because this test shouldn't actually be triggering any transforms
+  SpecialPowers.Services.obs.addObserver(function() {
+    ok(false, "The test fired an unexpected APZ:TransformEnd");
+  }, "APZ:TransformEnd");
+
+  yield* testPreventDefault(testDriver, 1);
+  yield* testPreventDefault(testDriver, 2);
+}
+
+waitUntilApzStable()
+.then(runContinuation(test))
+.then(subtestDone);
+
+  </script>
+</head>
+<body>
+  Here is some text to stare at as the test runs. It serves no functional
+  purpose, but gives you an idea of the zoom level. It's harder to tell what
+  the zoom level is when the page is just solid white.
+</body>
+</html>
--- a/gfx/layers/apz/test/mochitest/test_group_zoom.html
+++ b/gfx/layers/apz/test/mochitest/test_group_zoom.html
@@ -32,6 +32,9 @@ var prefs = [
  // Pinch-zooming currently requires meta viewport support (this requirement
  // will eventually be removed).
  ["dom.meta-viewport.enabled", true],
+  // Increase the content response timeout because some tests do preventDefault
+  // and we want to make sure APZ actually waits for them.
+  ["apz.content_response_timeout", 60000],
 ];

 // Increase the tap timeouts so the double-tap is still detected in case of
@@ -45,6 +48,7 @@ var doubletap_prefs = [
 var subtests = [
  {"file": "helper_bug1280013.html", "prefs": prefs},
  {"file": "helper_basic_zoom.html", "prefs": prefs},
+  {"file": "helper_zoom_prevented.html", "prefs": prefs},
  {"file": "helper_zoomed_pan.html", "prefs": prefs},
  {"file": "helper_fixed_position_scroll_hittest.html", "prefs": prefs},
  {"file": "helper_basic_doubletap_zoom.html", "prefs": doubletap_prefs},