SingleFile/WebContent/scripts/ui.js

/*
 * Copyright 2010 Gildas Lormeau
 * contact : gildas.lormeau <at> gmail.com
 * 
 * This file is part of SingleFile.
 *
 *   SingleFile is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   SingleFile is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with SingleFile.  If not, see <http://www.gnu.org/licenses/>.
 */

(function(holder) {
	function showProcessing() {
		var div = document.createElement("div");
		div.id = "__SingleFile_mask__";
		div.style.position = "fixed";
		div.style.top = "0px";
		div.style.left = "0px";
		div.style.height = "100%";
		div.style.width = "100%";
		div.style.backgroundColor = "black";
		div.style.zIndex = 2147483647;
		div.style.opacity = 0;
		div.style["-webkit-transition"] = "opacity 250ms";
		document.body.appendChild(div);
		div.offsetWidth;
		div.style.opacity = .3;
	}

	function hideProcessing() {
		var div = document.getElementById("__SingleFile_mask__");
		if (div)
			document.body.removeChild(div);
	}

	holder.ui = {
		init : function(bgPort) {
			if (window == top)
				bgPort.addListener(function(message) {
					if (message.start)
						showProcessing();
					else if (message.done)
						setTimeout(function() {
							hideProcessing();
						}, 250);
				});
		}
	};
})(singlefile);