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| -rw-r--r-- | layout/generic/test/test_bug1756831.html | 149 |
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diff --git a/layout/generic/test/test_bug1756831.html b/layout/generic/test/test_bug1756831.html new file mode 100644 index 0000000000..c95a79b84e --- /dev/null +++ b/layout/generic/test/test_bug1756831.html @@ -0,0 +1,149 @@ +<!DOCTYPE HTML> +<html> +<!-- +https://bugzilla.mozilla.org/show_bug.cgi?id=1756831 +--> +<head> + <title>Test for Bug 1756831</title> + <script src="/tests/SimpleTest/SimpleTest.js"></script> + <script src="/tests/SimpleTest/EventUtils.js"></script> + <link rel="stylesheet" href="/tests/SimpleTest/test.css"/> +</head> +<body> + + +<style> +.scroller { + height: 300px; + width: 300px; + overflow: hidden; + border: 1px solid grey; +} + +.long-content { + height: 300vh; +} + +.modal { + position: fixed; + top: 0; + left: 0; + right: 0; + bottom: 0; + background: rgba(0,0,0,0.1); + z-index: 10; +} + +</style> +<div id="sc" class="scroller"> + + <div class="long-content"> + <div style="width: 30px; height: 30px; background: blue;"></div> + <div class="modal"></div> + </div> + +</div> + + +<script> +SimpleTest.requestFlakyTimeout("need to wait for overlay scrollbars to fade out"); +SimpleTest.waitForExplicitFinish(); +// Test that mousing over content descendants that are not scrollable does not +// scroll the overlay scrollbars. + +/* We are testing overlay scrollbars here, specifically those that display when + the mouse is moved over scrollable content. The first two prefs are for + that. We set the prefs that determine the duration of the scrollbar fade out + so they are uniform for us. It would be nice if we could set a very short + duration so we didn't have to wait, or a very long duration so as to prevent + the possibility of the scrollbars disappearing before we take a screenshot + to compare against, however neither of those are workable. If the duration + is too short we risk the scrollbars disappearing before we can screenshot + them. If the duration is too long the test takes a long time. We can't + change the duration prefs part way through the test because the prefs are + only read when the a scroll frame is created or when a scroll frame is + reflowed and we've switched to/from overlay scrollbars. Both of these would + cause the scrollbars to be shown again which would interrupt the test. +*/ + +add_task(async function() { + await SimpleTest.promiseFocus(window); + await SpecialPowers.pushPrefEnv({"set": [["ui.useOverlayScrollbars", 1], + ["ui.scrollbarDisplayOnMouseMove", 1], + ["ui.scrollbarFadeDuration", 500], + ["ui.scrollbarFadeBeginDelay", 500]]}); + let utils = SpecialPowers.DOMWindowUtils; + + let sc = document.getElementById("sc"); + let boundingClientRect = sc.getBoundingClientRect(); + + // The div is initially overflow hidden, so it doesn't have scrollbars, + // capture that so we can compare against it later. + let noscrollbars = document.createElement("canvas"); + noscrollbars.setAttribute("width", boundingClientRect.width); + noscrollbars.setAttribute("height", boundingClientRect.height); + let ctx = noscrollbars.getContext("2d"); + SpecialPowers.wrap(ctx).drawWindow(window, boundingClientRect.x, boundingClientRect.y, + boundingClientRect.width, + boundingClientRect.height, + "rgb(255,255,255)"); + + // dump("noscrollbars " + noscrollbars.toDataURL() + "\n"); + + await new Promise(resolve => setTimeout(resolve, 0)); + + // make div scrollable + sc.style.overflow = "auto"; + + // and make sure it's reconstructed so the prefs get applied + document.documentElement.style.display = "table"; + document.documentElement.getBoundingClientRect(); + document.documentElement.style.display = ""; + document.documentElement.getBoundingClientRect(); + + + const maxRetries = 5; + let retries = 0; + let canvasesSame = false; + while (!canvasesSame && retries < maxRetries) { + // wait for the scrollbars to fade away, 500+500 from prefs, then a bit more. + await new Promise(resolve => setTimeout(resolve, 1500)); + + let canvas = document.createElement("canvas"); + canvas.setAttribute("width", boundingClientRect.width); + canvas.setAttribute("height", boundingClientRect.height); + // take screen shot + ctx = canvas.getContext("2d"); + SpecialPowers.wrap(ctx).drawWindow(window, boundingClientRect.x, boundingClientRect.y, + boundingClientRect.width, + boundingClientRect.height, + "rgb(255,255,255)"); + canvasesSame = (utils.compareCanvases(noscrollbars, canvas, {}) == 0); + retries++; + // dump("differences " + utils.compareCanvases(noscrollbars, canvas, {})); + // dump("canvas " + canvas.toDataURL() + "\n"); + } + + ok(canvasesSame, "scrollbars disappeared: canvasesSame " + canvasesSame + " retries " + retries) + + // send mouse move that should not show scrollbar + await synthesizeMouseAtCenter(document.documentElement, { type: "mousemove" }); + await new Promise(r => requestAnimationFrame(r)); + + let canvas = document.createElement("canvas"); + canvas.setAttribute("width", boundingClientRect.width); + canvas.setAttribute("height", boundingClientRect.height); + ctx = canvas.getContext("2d"); + SpecialPowers.wrap(ctx).drawWindow(window, boundingClientRect.x, boundingClientRect.y, + boundingClientRect.width, + boundingClientRect.height, + "rgb(255,255,255)"); + + let differences = utils.compareCanvases(noscrollbars, canvas, {}); + // dump("canvas " + canvas.toDataURL() + "\n"); + + ok(differences == 0, "differences " + differences); +}); +</script> +</body> +</html> |