Ticket #4716: dialog-position.patch

Index: /Users/sgonzale/Documents/workspace/jQuery UI/ui/ui.dialog.js
===================================================================
--- /Users/sgonzale/Documents/workspace/jQuery UI/ui/ui.dialog.js	(revision 2970)
+++ /Users/sgonzale/Documents/workspace/jQuery UI/ui/ui.dialog.js	(working copy)
@@ -10,6 +10,7 @@
  * Depends:
  *	ui.core.js
  *	ui.draggable.js
+ *  ui.position.js
  *	ui.resizable.js
  */
 (function($) {
@@ -377,55 +378,26 @@
 	},
 
 	_position: function(pos) {
-		var wnd = $(window), doc = $(document),
-			pTop = doc.scrollTop(), pLeft = doc.scrollLeft(),
-			minTop = pTop,
-			uiDialog = this.uiDialog;
-
-		if ($.inArray(pos, ['center','top','right','bottom','left']) >= 0) {
-			pos = [
-				pos == 'right' || pos == 'left' ? pos : 'center',
-				pos == 'top' || pos == 'bottom' ? pos : 'middle'
-			];
+		var offset = [0, 0];
+		pos = $.isArray(pos) ? pos : pos.split(' ');
+		if (pos.length == 1) {
+			pos[1] = pos[0];
 		}
-		if (pos.constructor != Array) {
-			pos = ['center', 'middle'];
-		}
-		if (pos[0].constructor == Number) {
-			pLeft += pos[0];
-		} else {
-			switch (pos[0]) {
-				case 'left':
-					pLeft += 0;
-					break;
-				case 'right':
-					pLeft += wnd.width() - uiDialog.outerWidth();
-					break;
-				default:
-				case 'center':
-					pLeft += (wnd.width() - uiDialog.outerWidth()) / 2;
+
+		$.each(['left', 'top'], function(i, offsetPosition) {
+			if (typeof pos[i] == 'number') {
+				offset[i] = pos[i];
+				pos[i] = offsetPosition;
 			}
-		}
-		if (pos[1].constructor == Number) {
-			pTop += pos[1];
-		} else {
-			switch (pos[1]) {
-				case 'top':
-					pTop += 0;
-					break;
-				case 'bottom':
-					pTop += wnd.height() - uiDialog.outerHeight();
-					break;
-				default:
-				case 'middle':
-					pTop += (wnd.height() - uiDialog.outerHeight()) / 2;
-			}
-		}
+		});
 
-		// prevent the dialog from being too high (make sure the titlebar
-		// is accessible)
-		pTop = Math.max(pTop, minTop);
-		uiDialog.css({top: pTop, left: pLeft});
+		this.uiDialog.position({
+			my: pos.join(' '),
+			at: pos.join(' '),
+			of: window,
+			offset: offset.join(' '),
+			collision: 'fit'
+		});
 	},
 
 	_setData: function(key, value){