Gmail label column resizer

User script that allows the labels column in Gmail to be resized
Wrap lines
// ==UserScript==
// @name           Gmail label column resizer
// @namespace      http://www.codecouch.com/
// @description    User script that allows the labels column in Gmail to be resized
// @include        http://mail.google.com/*
// @include        https://mail.google.com/*
// @match          http://mail.google.com/*
// @match          https://mail.google.com/*
// @version        1.2
// @history        1.2 Allow 10 seconds for the Gmail Greasemonkey API to load, Chrome & GM userscripts now share same code
// @history        1.1 Stopped duplicate grab bars and added more URL matching
// @history        1.0 Initial version
// @grant          none
// ==/UserScript==
 
var addGmailResizerToPage = function() {
 
	function loadGmailResizer() {
		// Insert code here...
 // Use the Gmail Greasemonkey API to reliably find the 2 main elements (the left- and right-hand columns). You do not need Greasemonkey installed 
// to use this API. See http://code.google.com/p/gmail-greasemonkey/wiki/GmailGreasemonkey10API for details (note: the documentation is out of date)
//
// Load the API. It will run our callback function when loaded, passing a GmailAPI object
gmonkey.load(2, function(o) {
	/*
		Set up variables. To keep the code size down, some are re-used. There should be no global namespace pollution
 
		i		initially points to the parent element of the left-hand nav, ultimately points to the parent element of the grab bar
		l		initially used as a loop counter, ultimately points to the element that is resized to change the left-hand column width
		r		initially used as a temporary loop variable, ultimately points to the style object of the element that is resized in the right-hand column
		c		initially points to the parent element of the active view, then parent element of all columns, then used to hold the width of columns 3-n (if present)
		d		this points to the document in the frame we use
		b		this points to the body
		t		this is used to calculate the top coordinate of the grab bar
		x		this holds the initial x delta between mouse click and left-hand column width
		w		initially used to point to the left-hand and main column elements, then during dragging, this holds the new width of the left-hand column
		n		initially holds pointers to all the columns elements, then the left-hand nav, then holds the string 'addEventListener'
		g		this points to the grab bar element
		Q		this holds the string 'querySelector'
		W		this holds the string 'width'
		U		used for many things, most notably holding the strings 'parentNode', 'childNodes', and 'cssText'
		P		this holds the string 'px'
		S		this holds the string 'style'
		k		this is the function that sets the width of the right-hand column
	*/		
 
	var i=o.getNavPaneElement(), l, r, c=o.getActiveViewElement(), d=c.ownerDocument, b=d.body, t=0, x, w, n, g, Q='querySelector', W='width', U='parentNode', P='px', S='style', k=function() { r[W]=b[o]-l[o]-c+P; };
 
	// Update c and i to point to their intended elements
	while(c.compareDocumentPosition(i)&2) c=c[U];
	while(i[U]!=b) i=i[U];
 
	// Update n to hold pointers to all the column elements (even if more than 2 are present), and w to point to just the first 2
	n=c[U='childNodes'], w=[n[0], n[1]];
 
	// Detect if a table has been used for layout (this happens with some of the Gmail labs, e.g. Right-side chat). If present, find the first
	// element that is controlling the cell's width by finding the first element that has an explicit non-zero width style set. This isn't a
	// perfect detection method (working with all the child nodes might be better), but it's better than nothing, and works at the moment :-)
	if(c.cells)
		for(o in w) {						// Loop over the first two table cells
			for(l in r=w[o][U])				// Find all of the cell's child elements and loop over them
				if(parseInt(r[l][S][W])) {		// If the current child element has a non-zero style width explicitly set...
					w[o]=r[l];			// ... then assume it is the width-controlling element, and store in in the current item in w
					break;				// There's no point in continuing to check the children (doing a "When a stranger calls")
				}
		}
 
	// Update l and r to point to their intended elements, and determine how much space is taken up
	// by any other columns (if present) by subtracting the label & main columns widths from the body width
	l=w[0], r=w[1][S], c=b[o='offsetWidth']-l[o]-w[1][o];
 
	// Create the grab bar, and insert it into the page
	g=i.appendChild(d.createElement('div'));
 
	// Copy the inline style from the "Compose" button. At present, the only inline style is a browser-specific user-select style used to prevent text selection.
	// This is applied to the right-hand column while dragging is underway to stop the text being selected. It is removed afterwards so that text can be copied.
	// This approach keeps the code size down, as the Gmail code handles the browser detection so I don't have to deal with vendor prefixes.
	// Store the inline style in a property called 'cssText2' of the right-hand column's style object
	n=l[Q]('[role^=n]');
	r[(U='cssText')+2]=n[Q]('[role]')[S][U];
 
	// Calculate the top position for the grab bar
	while(t+=n.offsetTop, n=n.offsetParent);
 
	// Style the grab bar
	g[S][U] = W + ':4px;position:absolute;z-index:1;left:' + (l[o]-5) + 'px;top:' + t + 'px;bottom:0;cursor:ew-resize;cursor:col-resize;background:url(data:image/gif;base64,R0lGODlhAwAEAIAAAL+/v////yH5BAAAAAAALAAAAAADAAQAAAIERGKnVwA7)';
 
	// Add a resize event to the window to update the size of the right-hand column when the window is resized
	// While Gmail does this anyway, it doesn't take into account any size change to the left-hand column
	top[n='addEventListener']('resize', k, 0);
 
	// Add mouse event listeners. mousedown is added to the grab bar, mousemove and mouseup to the document
	g[n]('mousedown', function(e) {
		// Only trigger with the LMB on grab bar. Stores initial x coord and width of left-hand column
		// Save a copy of the existing right-hand column style so we can restore it later, then disable text selection
		// Call e.preventDefault() to stop a native drag operation from starting (this happens a lot in Fx)
		e.which==1 && (x=l[o]-e.pageX, r[U+3]=r[U], r[U]+=r[U+2], e.preventDefault());
	}, 0);
 
	d[n]('mousemove', function(e) {
		// If we have the mouse button pressed, work out the x delta then update the column widths and the grab bar position
		x && (w=e.pageX+x, l[S][W]=w+P, g[S].left=w-5+P, k());
	}, 0);
 
	d[n]('mouseup', function(e) {
		// If the LMB is released, stop the mousemove code from running and restore the right-hand column style
		// k() needs to be called again, as restoring the style could alter the width
		e.which==1 && (x=0, r[U]=r[U+3], k());
	}, 0);
});

	};
 
	// Test for the presence of the Gmail Greasemonkey API once per second. Give up if not present after 10 seconds
	var loadCount = 0;
	function testForGmonkey() {
		loadCount++;
		if (loadCount == 10) clearInterval(timerHandle);
		if (typeof(gmonkey) == 'object' && 'load' in gmonkey) {
			clearInterval(timerHandle);
 
			// Only load the resizer code if it hasn't already been run (stops multiple grab bars from appearing)
			if ('loadedGmailResizer' in top) return;
			top.loadedGmailResizer = true;
			loadGmailResizer();
		}
	};
	var timerHandle = setInterval(testForGmonkey, 1000);
 
};
s = document.createElement('script');
s.type = 'text/javascript';
s.textContent = '(' + addGmailResizerToPage.toString() + ')()';
document.body.appendChild(s);
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