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Test Info:
<!-- This Source Code Form is subject to the terms of the Mozilla Public
- License, v. 2.0. If a copy of the MPL was not distributed with this
<!DOCTYPE HTML>
<html>
<!--
Test that we only render visible tree items.
-->
<head>
<meta charset="utf-8">
<title>Tree component test</title>
</head>
<body>
<pre id="test">
<script src="head.js" type="application/javascript"></script>
<script type="application/javascript">
'use strict'
window.onload = async function () {
try {
function getSpacerHeights() {
return {
top: document.querySelector(".tree > div:first-of-type").clientHeight,
bottom: document.querySelector(".tree > div:last-of-type").clientHeight,
};
}
const ITEM_HEIGHT = 3;
const ReactDOM = browserRequire("devtools/client/shared/vendor/react-dom");
const React = browserRequire("devtools/client/shared/vendor/react");
const Tree = React.createFactory(browserRequire("devtools/client/shared/components/VirtualizedTree"));
const tree = ReactDOM.render(
Tree(Object.assign({}, TEST_TREE_INTERFACE, { itemHeight: ITEM_HEIGHT })),
window.document.body);
TEST_TREE.expanded = new Set("ABCDEFGHIJKLMNO".split(""));
await setState(tree, {
height: 3 * ITEM_HEIGHT,
scroll: 1 * ITEM_HEIGHT
});
isAccessibleTree(tree);
isRenderedTree(document.body.textContent, [
"A:false",
"-B:false",
"--E:false",
"---K:false",
"---L:false",
], "Tree should show the 2nd, 3rd, and 4th items + buffer of 1 item at each end");
let spacers = getSpacerHeights();
is(spacers.top, 0, "Top spacer has the correct height");
is(spacers.bottom, 10 * ITEM_HEIGHT, "Bottom spacer has the correct height");
await setState(tree, {
height: 2 * ITEM_HEIGHT,
scroll: 3 * ITEM_HEIGHT
});
isAccessibleTree(tree);
isRenderedTree(document.body.textContent, [
"--E:false",
"---K:false",
"---L:false",
"--F:false",
], "Tree should show the 4th and 5th item + buffer of 1 item at each end");
spacers = getSpacerHeights();
is(spacers.top, 2 * ITEM_HEIGHT, "Top spacer has the correct height");
is(spacers.bottom, 9 * ITEM_HEIGHT, "Bottom spacer has the correct height");
// Set height to 2 items + 1 pixel at each end, scroll so that 4 items are visible
// (2 fully, 2 partially with 1 visible pixel)
await setState(tree, {
height: 2 * ITEM_HEIGHT + 2,
scroll: 3 * ITEM_HEIGHT - 1
});
isRenderedTree(document.body.textContent, [
"-B:false",
"--E:false",
"---K:false",
"---L:false",
"--F:false",
"--G:false",
], "Tree should show the 4 visible items + buffer of 1 item at each end");
spacers = getSpacerHeights();
is(spacers.top, 1 * ITEM_HEIGHT, "Top spacer has the correct height");
is(spacers.bottom, 8 * ITEM_HEIGHT, "Bottom spacer has the correct height");
await setState(tree, {
height: 20 * ITEM_HEIGHT,
scroll: 0
});
isRenderedTree(document.body.textContent, [
"A:false",
"-B:false",
"--E:false",
"---K:false",
"---L:false",
"--F:false",
"--G:false",
"-C:false",
"--H:false",
"--I:false",
"-D:false",
"--J:false",
"M:false",
"-N:false",
"--O:false",
], "Tree should show all rows");
spacers = getSpacerHeights();
is(spacers.top, 0, "Top spacer has zero height");
is(spacers.bottom, 0, "Bottom spacer has zero height");
} catch(e) {
ok(false, "Got an error: " + DevToolsUtils.safeErrorString(e));
} finally {
SimpleTest.finish();
}
};
</script>
</pre>
</body>
</html>