flymis/WebRoot/dojojs/src/html/metrics.js

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/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/

dojo.provide("dojo.html.metrics");
dojo.require("dojo.html.layout");

/*	dojo.html.metrics
 *	Methods to help determine font metrics, including things like
 *	how much of a string will fit inside a certain width, what size
 *	something might be if you were to place it in a certain node, etc.
 *
 *	Based partially on a submitted patch by Morris Johns, and work
 *	done with 13th Parallel and f( m ) (the 13th columns and the
 *	unreleased f( m ) layout manager.
 */

//	derived from Morris John's scrollbar measurer.
dojo.html.getScrollbar=function(){
	//	summary
	//	returns the width of a scrollbar.
	
	//	set up the test nodes.
	var scroll = document.createElement("div");
	scroll.style.width="100px";
	scroll.style.height="100px";
	scroll.style.overflow="scroll";
	scroll.style.position="absolute";
	scroll.style.top="-300px";
	scroll.style.left="0px"
	
	var test = document.createElement("div");
	test.style.width="400px";
	test.style.height="400px";
	scroll.appendChild(test);
	dojo.body().appendChild(scroll);

	var width=scroll.offsetWidth - scroll.clientWidth;

	dojo.body().removeChild(scroll);
	scroll.removeChild(test);
	scroll=test=null;

	//	we return an object because we may add additional info in the future.
	return { width: width };	//	object
};

//	derived from Morris John's emResized measurer
dojo.html.getFontMeasurements = function(){
	//	summary
	//	Returns an object that has pixel equivilents of standard font size values.
	var heights = {
		'1em':0, '1ex':0, '100%':0, '12pt':0, '16px':0, 'xx-small':0, 'x-small':0,
		'small':0, 'medium':0, 'large':0, 'x-large':0, 'xx-large':0