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// Keep track of how many fullscreenChange enters we've received, so that
// we can balance them with the number of exits we receive. We reset this
// to 0 when we load a test.
var fullscreenChangeEnters = 0;
addLoadEvent(function () {
info(`Resetting fullscreen enter count.`);
fullscreenChangeEnters = 0;
});
// This can be used to force a certain value for fullscreenChangeEnters
// to handle unusual conditions -- such as exiting multiple levels of
// fullscreen forcibly.
function setFullscreenChangeEnters(enters) {
info(`Setting fullscreen enter count to ${enters}.`);
fullscreenChangeEnters = enters;
}
// Returns true if the window believes it is in fullscreen. This may be true even
// before an asynchronous fullscreen transition is complete.
function inFullscreenMode(win) {
return win.document.fullscreenElement;
}
// Adds a listener that will be called once a fullscreen transition
// is complete. When type==='enter', callback is called when we've
// received a fullscreenchange event, and the fullscreen transition is
// complete. When type==='exit', callback is called when we've
// received a fullscreenchange event and the window is out of
// fullscreen. inDoc is the document which the listeners are added on,
// if absent, the listeners are added to the current document.
// the current document.
function addFullscreenChangeContinuation(type, callback, inDoc) {
var doc = inDoc || document;
var topWin = doc.defaultView.top;
function checkCondition() {
if (type == "enter") {
fullscreenChangeEnters++;
return inFullscreenMode(topWin);
} else if (type == "exit") {
fullscreenChangeEnters--;
return fullscreenChangeEnters
? inFullscreenMode(topWin)
: !inFullscreenMode(topWin);
}
throw new Error("'type' must be either 'enter', or 'exit'.");
}
function onFullscreenChange(event) {
doc.removeEventListener("fullscreenchange", onFullscreenChange);
ok(checkCondition(), `Should ${type} fullscreen.`);
// Delay invocation so other listeners have a chance to respond before
// we continue.
requestAnimationFrame(() => setTimeout(() => callback(event), 0), 0);
}
doc.addEventListener("fullscreenchange", onFullscreenChange);
}
// Calls |callback| when the next fullscreenerror is dispatched to inDoc||document.
function addFullscreenErrorContinuation(callback, inDoc) {
let doc = inDoc || document;
let listener = function (event) {
doc.removeEventListener("fullscreenerror", listener);
// Delay invocation so other listeners have a chance to respond before
// we continue.
requestAnimationFrame(() => setTimeout(() => callback(event), 0), 0);
};
doc.addEventListener("fullscreenerror", listener);
}
// Waits until the window has both the load event and a MozAfterPaint called on
// it, and then invokes the callback
function waitForLoadAndPaint(win, callback) {
win.addEventListener(
"MozAfterPaint",
function () {
// The load event may have fired before the MozAfterPaint, in which case
// listening for it now will hang. Instead we check the readyState to see if
// it already fired, and if so, invoke the callback right away.
if (win.document.readyState == "complete") {
callback();
} else {
win.addEventListener("load", callback, { once: true });
}
},
{ once: true }
);
}