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var scrollbarWidth = 17,
scrollbarHeight = 17;
function testElements(baseid, callback) {
scrollbarWidth = scrollbarHeight = gcs($("scrollbox-test"), "width");
var elements = $(baseid).getElementsByTagName("*");
for (var t = 0; t < elements.length; t++) {
var element = elements[t];
// Ignore presentational content inside menus
if (
element.closest("menu, menuitem") &&
element.closest("[aria-hidden=true]")
) {
continue;
}
// Ignore content inside a <button> This can be removed if/when
// button switches to use shadow DOM.
let buttonParent = element.closest("button");
if (buttonParent && buttonParent !== element) {
continue;
}
testElement(element);
}
var nonappended = document.createElementNS(
"div"
);
nonappended.id = "nonappended";
nonappended.setAttribute("_offsetParent", "null");
testElement(nonappended);
checkScrolledElement($("scrollbox"), $("scrollchild"));
var div = $("noscroll");
div.scrollLeft = 10;
div.scrollTop = 10;
is(element.scrollLeft, 0, element.id + " scrollLeft after nonscroll");
is(element.scrollTop, 0, element.id + " scrollTop after nonscroll");
callback();
}
function usesSVGLayout(e) {
return e instanceof SVGElement && !(e instanceof SVGSVGElement);
}
function toNearestAppunit(v) {
// 60 appunits per CSS pixel; round result to the nearest appunit
return Math.round(v * 60) / 60;
}
function isEqualAppunits(a, b, msg) {
is(toNearestAppunit(a), toNearestAppunit(b), msg);
}
function testElement(element) {
var offsetParent = element.getAttribute("_offsetParent");
offsetParent = $(
offsetParent == "null" ? null : offsetParent ? offsetParent : "body"
);
var borderLeft = gcs(element, "borderLeftWidth");
var borderTop = gcs(element, "borderTopWidth");
var borderRight = gcs(element, "borderRightWidth");
var borderBottom = gcs(element, "borderBottomWidth");
var paddingLeft = gcs(element, "paddingLeft");
var paddingTop = gcs(element, "paddingTop");
var paddingRight = gcs(element, "paddingRight");
var paddingBottom = gcs(element, "paddingBottom");
var width = gcs(element, "width");
var height = gcs(element, "height");
if (element instanceof HTMLElement) {
checkOffsetState(
element,
-10000,
-10000,
borderLeft + paddingLeft + width + paddingRight + borderRight,
borderTop + paddingTop + height + paddingBottom + borderBottom,
offsetParent,
element.id
);
}
var scrollWidth, scrollHeight, clientWidth, clientHeight;
var doScrollCheck = true;
{
if (element.id == "scrollbox") {
clientWidth = paddingLeft + width + paddingRight - scrollbarWidth;
clientHeight = paddingTop + height + paddingBottom - scrollbarHeight;
} else {
clientWidth = paddingLeft + width + paddingRight;
clientHeight = paddingTop + height + paddingBottom;
}
if (element.id == "overflow-visible") {
scrollWidth = 200;
scrollHeight = 201;
} else if (
element.scrollWidth > clientWidth ||
element.scrollHeight > clientHeight
) {
// The element overflows. Don't check scrollWidth/scrollHeight since the
// above calculation is not correct.
doScrollCheck = false;
} else {
scrollWidth = clientWidth;
scrollHeight = clientHeight;
}
}
if (doScrollCheck) {
if (usesSVGLayout(element)) {
checkScrollState(element, 0, 0, 0, 0, element.id);
} else {
checkScrollState(element, 0, 0, scrollWidth, scrollHeight, element.id);
}
}
if (usesSVGLayout(element)) {
checkClientState(element, 0, 0, 0, 0, element.id);
} else {
checkClientState(
element,
borderLeft,
borderTop,
clientWidth,
clientHeight,
element.id
);
}
var boundingrect = element.getBoundingClientRect();
isEqualAppunits(
boundingrect.width,
borderLeft + paddingLeft + width + paddingRight + borderRight,
element.id + " bounding rect width"
);
isEqualAppunits(
boundingrect.height,
borderTop + paddingTop + height + paddingBottom + borderBottom,
element.id + " bounding rect height"
);
isEqualAppunits(
boundingrect.right - boundingrect.left,
boundingrect.width,
element.id + " bounding rect right"
);
isEqualAppunits(
boundingrect.bottom - boundingrect.top,
boundingrect.height,
element.id + " bounding rect bottom"
);
var rects = element.getClientRects();
if (element.id == "div-displaynone" || element.id == "nonappended") {
is(rects.length, 0, element.id + " getClientRects empty");
} else {
is(rects[0].left, boundingrect.left, element.id + " getClientRects left");
is(rects[0].top, boundingrect.top, element.id + " getClientRects top");
is(
rects[0].right,
boundingrect.right,
element.id + " getClientRects right"
);
is(
rects[0].bottom,
boundingrect.bottom,
element.id + " getClientRects bottom"
);
}
}
function checkScrolledElement(element, child) {
var elemrect = element.getBoundingClientRect();
var childrect = child.getBoundingClientRect();
var topdiff = childrect.top - elemrect.top;
element.scrollTop = 20;
is(element.scrollLeft, 0, element.id + " scrollLeft after vertical scroll");
is(element.scrollTop, 20, element.id + " scrollTop after vertical scroll");
// If the viewport has been transformed, then we might have scrolled to a subpixel value
// that's slightly different from what we requested. After rounding, however, it should
// be the same.
is(
Math.round(childrect.top - child.getBoundingClientRect().top),
20,
"child position after vertical scroll"
);
element.scrollTop = 0;
is(
element.scrollLeft,
0,
element.id + " scrollLeft after vertical scroll reset"
);
is(
element.scrollTop,
0,
element.id + " scrollTop after vertical scroll reset"
);
// Scrolling back to the top should work precisely.
is(
child.getBoundingClientRect().top,
childrect.top,
"child position after vertical scroll reset"
);
element.scrollTop = 10;
element.scrollTop = -30;
is(
element.scrollLeft,
0,
element.id + " scrollLeft after vertical scroll negative"
);
is(
element.scrollTop,
0,
element.id + " scrollTop after vertical scroll negative"
);
is(
child.getBoundingClientRect().top,
childrect.top,
"child position after vertical scroll negative"
);
element.scrollLeft = 18;
is(
element.scrollLeft,
18,
element.id + " scrollLeft after horizontal scroll"
);
is(element.scrollTop, 0, element.id + " scrollTop after horizontal scroll");
is(
Math.round(childrect.left - child.getBoundingClientRect().left),
18,
"child position after horizontal scroll"
);
element.scrollLeft = -30;
is(
element.scrollLeft,
0,
element.id + " scrollLeft after horizontal scroll reset"
);
is(
element.scrollTop,
0,
element.id + " scrollTop after horizontal scroll reset"
);
is(
child.getBoundingClientRect().left,
childrect.left,
"child position after horizontal scroll reset"
);
}
function checkOffsetState(element, left, top, width, height, parent, testname) {
checkCoords(element, "offset", left, top, width, height, testname);
is(element.offsetParent, parent, testname + " offsetParent");
}
function checkScrollState(element, left, top, width, height, testname) {
checkCoords(element, "scroll", left, top, width, height, testname);
}
function checkClientState(element, left, top, width, height, testname) {
checkCoords(element, "client", left, top, width, height, testname);
}
function checkCoord(element, type, val, testname) {
if (val != -10000) {
is(element[type], Math.round(val), testname + " " + type);
}
}
function checkCoordFuzzy(element, type, val, fuzz, testname) {
if (val != -10000) {
let v = element[type];
ok(
Math.abs(v - Math.round(val)) <= fuzz,
`${testname} ${type}: ${v} vs. ${val}`
);
}
}
function checkCoords(element, type, left, top, width, height, testname) {
checkCoord(element, type + "Left", left, testname);
checkCoord(element, type + "Top", top, testname);
if (type == "scroll") {
// scrollWidth and scrollHeight can deviate by 1 pixel due to snapping.
checkCoordFuzzy(element, type + "Width", width, 1, testname);
checkCoordFuzzy(element, type + "Height", height, 1, testname);
} else {
checkCoord(element, type + "Width", width, testname);
checkCoord(element, type + "Height", height, testname);
}
if (usesSVGLayout(element)) {
return;
}
if (element.id == "outerpopup" && !element.parentNode.open) {
// closed popup
return;
}
if (element.id == "div-displaynone" || element.id == "nonappended") {
// hidden elements
ok(
element[type + "Width"] == 0 && element[type + "Height"] == 0,
element.id + " has zero " + type + " width and height"
);
}
}
function gcs(element, prop) {
var propVal =
usesSVGLayout(element) && (prop == "width" || prop == "height")
? element.getAttribute(prop)
: getComputedStyle(element, "")[prop];
if (propVal == "auto" || element.id == "nonappended") {
return 0;
}
return parseFloat(propVal);
}