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Bug 1561726 - Add a test to exercise dragging the viewport scrollbar. r=kats
Differential Revision: https://phabricator.services.mozilla.com/D34259 --HG-- extra : moz-landing-system : lando
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<!DOCTYPE HTML>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width; initial-scale=1.0">
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<title>Dragging the mouse on the viewport's scrollbar</title>
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<script type="application/javascript" src="apz_test_native_event_utils.js"></script>
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<script type="application/javascript" src="apz_test_utils.js"></script>
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<script src="/tests/SimpleTest/paint_listener.js"></script>
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<style>
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.content {
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width: 1000px;
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height: 5000px;
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}
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</style>
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<script type="text/javascript">
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function* test(testDriver) {
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window.addEventListener("scroll", () => setTimeout(testDriver, 0), {once: true});
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var dragFinisher = yield* dragVerticalScrollbar(window, testDriver);
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if (!dragFinisher) {
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ok(true, "No scrollbar, can't do this test");
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return;
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}
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// the events above might be stuck in APZ input queue for a bit until the
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// layer is activated, so we wait here until the scroll event listener is
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// triggered.
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yield;
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yield* dragFinisher();
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// Flush everything just to be safe
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yield flushApzRepaints(testDriver);
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// After dragging the scrollbar 20px on a 1000px-high viewport, we should
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// have scrolled approx 2% of the 5000px high content. There might have been
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// scroll arrows and such so let's just have a minimum bound of 50px to be safe.
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ok(window.scrollY > 50, "Scrollbar drag resulted in a vertical scroll position of " + window.scrollY);
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// Check that we did not get spurious horizontal scrolling, as we might if the
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// drag gesture is mishandled by content as a select-drag rather than a scrollbar
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// drag.
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is(window.scrollX, 0, "Scrollbar drag resulted in a horizontal scroll position of " + window.scrollX);
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}
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waitUntilApzStable()
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.then(runContinuation(test))
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.then(subtestDone);
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</script>
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</head>
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<body>
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<div class="content">Some content to ensure the root scrollframe is scrollable</div>
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</body>
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</html>
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@ -16,6 +16,12 @@ var subtests = [
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{"file": "helper_click.html?dtc=true"},
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// Sanity test for click but with some mouse movement between the down and up
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{"file": "helper_drag_click.html"},
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// Test for dragging on the scrollbar of the root scrollable element works.
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// This takes different codepaths with async zooming support enabled and
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// disabled, and so needs to be tested separately for both.
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// TODO(bug 1556556): Once we get this working with zooming enabled,
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// add an entry to run this with apz.allow_zooming=true as well.
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{"file": "helper_drag_root_scrollbar.html", "prefs": [["apz.allow_zooming", false]]},
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// Test for dragging on a fake-scrollbar element that scrolls the page
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{"file": "helper_drag_scroll.html"},
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// Test for dragging the scrollbar with a fixed-pos element overlaying it
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