document.loadOverlay

Bug330458.uc.js

// ==uc==
// @include *
// @exclude chrome://browser/content/preferences/preferences.xul
// ==/uc==


(function Bug330458() {
	var orgLoadOverlay = document.loadOverlay;
	var queue = [];
	var loading = false;

	function Observer(org) {
		this.org = org;
	}
	Observer.prototype = {
		constructor: Observer,
		observe: function observe(subject, topic, data) {
			try {
				if (this.org instanceof Ci.nsIObserver)
					this.org.observe(subject, topic, data);
			} catch (e) {
				Cu.reportError(e);
			}

			if (topic === 'xul-overlay-merged')
				setTimeout(next, 0);
		},
		QueryInterface: function(iId) {
			if(iId.equals(Ci.nsISupports) || iId.equals(Ci.nsIObserver))
				return this;

			throw Cr.NS_ERROR_NO_INTERFACE;
		},
	};
	function next() {
		loading = false;
		var args = queue.shift();
		if (args)
			loadOverlay.apply(document, args);
	}
	function loadOverlay(url, observer) {
		if (loading) {
			queue.push([url, observer]);
			return;
		}

		loading = true;
		orgLoadOverlay.call(this, url, new Observer(observer));
	}

	document.loadOverlay = loadOverlay;
})();