test_media_queries_dynamic.html
<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=473400
-->
<head>
<title>Test for Bug 473400</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body onload="run()">
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=473400">Mozilla Bug 473400</a>
<iframe id="subdoc" src="about:blank"></iframe>
<div id="content" style="display: none">
</div>
<pre id="test">
<script class="testbody" type="application/javascript">
/** Test for Bug 473400 **/
SimpleTest.waitForExplicitFinish();
function run() {
var subdoc = document.getElementById("subdoc").contentDocument;
var subwin = document.getElementById("subdoc").contentWindow;
var style = subdoc.createElement("style");
style.setAttribute("type", "text/css");
subdoc.getElementsByTagName("head")[0].appendChild(style);
var sheet = style.sheet;
var iframe_style = document.getElementById("subdoc").style;
// Create a style rule and an element now based on the given media
// query "q", and return the computed style that should be passed to
// query_applies to see if that query currently applies.
var n = 0;
function make_query(q) {
var i = ++n;
sheet.insertRule("@media " + q + " { #e" + i + " { text-decoration: underline; } }", sheet.cssRules.length);
var e = subdoc.createElement("div");
e.id = "e" + i;
subdoc.body.appendChild(e);
var cs = subdoc.defaultView.getComputedStyle(e);
cs._originalQueryText = q;
return cs;
}
function query_applies(cs) {
return cs.getPropertyValue("text-decoration-line") == "underline";
}
function should_apply(cs) {
ok(query_applies(cs), cs._originalQueryText + " should apply");
}
function should_not_apply(cs) {
ok(!query_applies(cs), cs._originalQueryText + " should not apply");
}
var content_div = document.getElementById("content");
content_div.style.font = "initial";
var em_size =
getComputedStyle(content_div, "").fontSize.match(/^(\d+)px$/)[1];
let width_val = 317; // pick two not-too-round numbers
let height_val = 228;
iframe_style.width = width_val + "px";
iframe_style.height = height_val + "px";
var wh_queries = [
make_query("all and (min-width: " +
(Math.ceil(width_val/em_size) + 1) + "em)"),
make_query("all and (min-width: " +
(Math.floor(width_val/em_size) - 1) + "em)"),
make_query("all and (max-width: " +
(Math.ceil(width_val/em_size) + 1) + "em)"),
make_query("all and (max-width: " +
(Math.floor(width_val/em_size) - 1) + "em)"),
make_query("all and (min-width: " +
(Math.ceil(width_val/(em_size*2)) + 1) + "em)"),
make_query("all and (min-width: " +
(Math.floor(width_val/(em_size*2)) - 1) + "em)"),
make_query("all and (max-width: " +
(Math.ceil(width_val/(em_size*2)) + 1) + "em)"),
make_query("all and (max-width: " +
(Math.floor(width_val/(em_size*2)) - 1) + "em)")
];
is(wh_queries[0].fontSize, em_size + "px", "text zoom is 1.0");
should_not_apply(wh_queries[0]);
should_apply(wh_queries[1]);
should_apply(wh_queries[2]);
should_not_apply(wh_queries[3]);
SpecialPowers.setTextZoom(subwin, 2.0);
isnot(wh_queries[0].fontSize, em_size + "px", "text zoom is not 1.0");
should_not_apply(wh_queries[4]);
should_apply(wh_queries[5]);
should_apply(wh_queries[6]);
should_not_apply(wh_queries[7]);
SpecialPowers.setTextZoom(subwin, 1.0);
is(wh_queries[0].fontSize, em_size + "px", "text zoom is 1.0");
is(subwin.innerHeight, 228, "full zoom is 1.0");
should_not_apply(wh_queries[0]);
should_apply(wh_queries[1]);
should_apply(wh_queries[2]);
should_not_apply(wh_queries[3]);
SpecialPowers.setFullZoom(subwin, 2.0);
isnot(subwin.innerHeight, 228, "full zoom is not 1.0");
should_not_apply(wh_queries[4]);
should_apply(wh_queries[5]);
should_apply(wh_queries[6]);
should_not_apply(wh_queries[7]);
SpecialPowers.setFullZoom(subwin, 1.0);
is(subwin.innerHeight, 228, "full zoom is 1.0");
// Now test that certain things *don't* happen, i.e., that we're
// making the optimizations we expect.
subdoc.body.textContent = "";
subdoc.body.appendChild(subdoc.createElement("div"));
for (var ruleIdx = sheet.cssRules.length; ruleIdx-- != 0; ) {
sheet.deleteRule(ruleIdx);
}
var utils = SpecialPowers.getDOMWindowUtils(subwin);
var restyleGeneration, framesConstructed, framesReflowed;
function reset_change_counters()
{
restyleGeneration = utils.restyleGeneration;
framesConstructed = utils.framesConstructed;
framesReflowed = utils.framesReflowed;
}
function flush_and_assert_change_counters(desc, expected) {
subdoc.body.offsetHeight;
if (!("restyle" in expected) ||
!("construct" in expected) ||
!("reflow" in expected)) {
ok(false, "parameter missing expectation");
return;
}
var didRestyle = utils.restyleGeneration != restyleGeneration;
var constructs = utils.framesConstructed - framesConstructed;
var reflows = utils.framesReflowed - framesReflowed;
(expected.restyle ? isnot : is)(didRestyle, false, "restyle: " + desc);
(expected.construct ? isnot : is)(constructs, 0,
"frame construct count: " + desc);
(expected.reflow ? isnot : is)(reflows, 0, "reflow count: " + desc);
reset_change_counters();
}
subdoc.body.offsetHeight;
reset_change_counters();
iframe_style.width = "103px";
flush_and_assert_change_counters("change width with no media queries",
{ restyle: false, construct: false, reflow: true });
flush_and_assert_change_counters("no change",
{ restyle: false, construct: false, reflow: false });
iframe_style.height = "123px";
flush_and_assert_change_counters("change height with no media queries",
{ restyle: false, construct: false, reflow: true });
sheet.insertRule("@media (min-width: 150px) { div { display:flex } }", 0);
flush_and_assert_change_counters("add non-matching media query",
{ restyle: false, construct: false, reflow: false });
iframe_style.width = "177px";
flush_and_assert_change_counters("resize width across media query with 'display'",
{ restyle: true, construct: true, reflow: true });
iframe_style.width = "162px";
flush_and_assert_change_counters("resize width without crossing media query",
{ restyle: false, construct: false, reflow: true });
sheet.deleteRule(0);
flush_and_assert_change_counters("remove matching media query with 'display'",
{ restyle: true, construct: true, reflow: true });
sheet.insertRule("@media (max-height: 150px) { div { display:flex } }", 0);
flush_and_assert_change_counters("add matching media query with 'display'",
{ restyle: true, construct: true, reflow: true });
iframe_style.height = "111px";
flush_and_assert_change_counters("resize height without crossing media query",
{ restyle: false, construct: false, reflow: true });
iframe_style.height = "184px";
flush_and_assert_change_counters("resize height across media query with 'display'",
{ restyle: true, construct: true, reflow: true });
sheet.deleteRule(0);
flush_and_assert_change_counters("remove non-matching media query",
{ restyle: false, construct: false, reflow: false });
SimpleTest.finish();
}
</script>
</pre>
</body>
</html>
