mozilla-central/devtools/client/inspector/fonts/test/browser_fontinspector_reveal-in-page.js (file symbol)

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/* Any copyright is dedicated to the Public Domain.
"use strict";
// Test that fonts usage can be revealed in the page using the FontsHighlighter.
const TEST_URI = URL_ROOT + "doc_browser_fontinspector.html";
add_task(async function () {
// Make sure the toolbox is tall enough to accomodate all fonts, otherwise mouseover
// events simulation will fail.
await pushPref("devtools.toolbox.footer.height", 500);
const { view } = await openFontInspectorForURL(TEST_URI);
await testFontHighlighting(view);
info("Check that highlighting still works after reloading the page");
await reloadBrowser();
await testFontHighlighting(view);
});
async function testFontHighlighting(view) {
// The number of window selection change events we expect to get as we hover over each
// font in the list. Waiting for those events is how we know that text-runs were
// highlighted in the page.
// The reason why these numbers vary is because the highlighter may create more than
// 1 selection range object, depending on the number of text-runs found.
const expectedSelectionChangeEvents = [2, 2, 2, 1, 1];
const viewDoc = view.document;
// Wait for the view to have all the expected used fonts.
const fontEls = await waitFor(() => {
const els = getUsedFontsEls(viewDoc);
if (els.length !== expectedSelectionChangeEvents.length) {
return false;
}
return els;
});
for (let i = 0; i < fontEls.length; i++) {
info(
`Mousing over and out of font number ${i} ("${fontEls[i].textContent}") in the list`
);
// Simulating a mouse over event on the font name and expecting a selectionchange.
const nameEl = fontEls[i];
let onEvents = waitForNSelectionEvents(expectedSelectionChangeEvents[i]);
EventUtils.synthesizeMouse(
nameEl,
2,
2,
{ type: "mouseover" },
viewDoc.defaultView
);
await onEvents;
ok(
true,
`${expectedSelectionChangeEvents[i]} selectionchange events detected on mouseover`
);
// Simulating a mouse out event on the font name and expecting a selectionchange.
const otherEl = viewDoc.querySelector("body");
onEvents = waitForNSelectionEvents(1);
EventUtils.synthesizeMouse(
otherEl,
2,
2,
{ type: "mouseover" },
viewDoc.defaultView
);
await onEvents;
ok(true, "1 selectionchange events detected on mouseout");
}
}
async function waitForNSelectionEvents(numberOfTimes) {
await SpecialPowers.spawn(
gBrowser.selectedBrowser,
[numberOfTimes],
async function (n) {
const win = content.wrappedJSObject;
await new Promise(resolve => {
let received = 0;
win.document.addEventListener("selectionchange", function listen() {
received++;
if (received === n) {
win.document.removeEventListener("selectionchange", listen);
resolve();
}
});
});
}
);
}