Source code
Revision control
Copy as Markdown
Other Tools
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width; initial-scale=1.0">
<title>Scrolling with mouse down on the scrollbar</title>
<script type="application/javascript" src="apz_test_native_event_utils.js"></script>
<script type="application/javascript" src="apz_test_utils.js"></script>
<script src="/tests/SimpleTest/paint_listener.js"></script>
<style>
.content {
width: 1000px;
height: 20000px;
}
</style>
<script type="text/javascript">
async function test() {
var targetElement = elementForTarget(window);
var w = {},
h = {};
var utils = utilsForTarget(window);
utils.getScrollbarSizes(targetElement, w, h);
var verticalScrollbarWidth = w.value;
var mouseX = targetElement.clientWidth + verticalScrollbarWidth / 2;
var mouseY = targetElement.clientHeight - 100; // 100 pixels above the bottom of the scrollbar track
let scrollEndPromise = promiseScrollend();
// Click and hold the mouse. Thumb should start scrolling towards the click location.
await promiseNativeMouseEventWithAPZ({
target: window,
offsetX: mouseX,
offsetY: mouseY,
type: "mousemove",
});
// mouse down
await promiseNativeMouseEventWithAPZ({
target: window,
offsetX: mouseX,
offsetY: mouseY,
type: "mousedown",
});
// Wait for scrolling to complete
await scrollEndPromise;
// event too early.
if (window.scrollY < (window.scrollMaxY / 2)) {
scrollEndPromise = promiseScrollend();
await scrollEndPromise;
}
// Flush everything just to be safe
await promiseOnlyApzControllerFlushed();
// Give WebRender a chance to sample any remaining async scroll offset
// that affects the scrollbar position.
utils.advanceTimeAndRefresh(16);
utils.restoreNormalRefresh();
var result = hitTest({x: mouseX, y: mouseY});
// Check that the scroll thumb is under the cursor.
// If the bug occurs, the thumb will scroll too far and
// will not be under the cursor.
ok((result.hitInfo & APZHitResultFlags.SCROLLBAR_THUMB) != 0, "Scrollbar thumb hit");
await promiseNativeMouseEventWithAPZ({
target: window,
offsetX: mouseX,
offsetY: mouseY,
type: "mouseup",
});
}
if (getPlatform() == "mac") {
subtestDone();
} else {
// Note: on Linux, if the gtk-primary-button-warps-slider setting
// is enabled, this test will not exercise the codepath it intends
// to test (the thumb will jump immediately under the cursor, causing
// the test to pass trivially). However, the test should still not fail.
waitUntilApzStable()
.then(test)
.then(subtestDone, subtestFailed);
}
</script>
</head>
<body>
<div class="content">Some content to ensure the root scrollframe is scrollable</div>
</body>
</html>