From 1d3b8ff78eaa3d64a839ba34af34d1e8b24f82af Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Scott=20Gonz=C3=A1lez?= <scott.gonzalez@gmail.com>
Date: Thu, 16 May 2013 06:26:03 -0400
Subject: [PATCH] Position: Use absolute positioning when getting scrollbar
 width to avoid reflows of user content. Fixes #9291 - Position -
 $.position.scrollbarWidth detection causes layout issues.

---
 demos/position/default.html | 150 +++++++++++-------------------------
 ui/jquery.ui.position.js    |   2 +-
 2 files changed, 47 insertions(+), 105 deletions(-)
diff --git a/demos/position/default.html b/demos/position/default.html
index ad5a3d874..f94d316e3 100644
--- a/demos/position/default.html
+++ b/demos/position/default.html
@@ -12,126 +12,68 @@
 	<script src="../../ui/jquery.ui.position.js"></script>
 	<link rel="stylesheet" href="../demos.css">
 	<style>
-	#parent {
-		width: 60%;
-		height: 40px;
-		margin: 10px auto;
-		padding: 5px;
-		border: 1px solid #777;
-		background-color: #fbca93;
-		text-align: center;
+	body {
+	    margin: 0;
+	    padding: 0;
 	}
-	.positionable {
-		position: absolute;
-		display: block;
-		right: 0;
-		bottom: 0;
-		background-color: #bcd5e6;
-		text-align: center;
+	body > div[style*='display'] {
+	    /* Workaround */
+	    /* position: absolute; */
 	}
-	#positionable1 {
-		width: 75px;
-		height: 75px;
+	.blue {
+	    background: blue;
+	    float: left;
+	    width: 100px;
 	}
-	#positionable2 {
-		width: 120px;
-		height: 40px;
+	.red {
+	    background: red;
+	    float: left;
+	    overflow-y: hidden;
 	}
-	select, input {
-		margin-left: 15px;
+	.content {
+	    width: 2000px;
+	    height: 400px;
+	    border: 2px solid white;
 	}
+	#uiPosition {
+	    width: 100px;
+	    height: 100px;
+	    background: #ccc;
+	}
+
 	</style>
 	<script>
 	$(function() {
-		function position() {
-			$( ".positionable" ).position({
-				of: $( "#parent" ),
-				my: $( "#my_horizontal" ).val() + " " + $( "#my_vertical" ).val(),
-				at: $( "#at_horizontal" ).val() + " " + $( "#at_vertical" ).val(),
-				collision: $( "#collision_horizontal" ).val() + " " + $( "#collision_vertical" ).val()
-			});
-		}
-
-		$( ".positionable" ).css( "opacity", 0.5 );
-
-		$( "select, input" ).bind( "click keyup change", position );
-
-		$( "#parent" ).draggable({
-			drag: position
+		$( "#redBlock" ).css({
+		    width: $( window ).width() - $( "#blueBlock" ).width()
+		});
+		$( ".block" ).css({
+		    height: $( window ).height()
 		});
 
-		position();
+		$( "button" ).on('click', function (e) {
+		    $( "#uiPosition" )
+		        .position({
+		            my: "left top",
+		            at: "left bottom",
+		            of: e.target,
+		            within: $( "#redBlock" ),
+		            collision: "flip"
+		        });
+		});
 	});
 	</script>
 </head>
 <body>
 
-<div id="parent">
-	<p>
-	This is the position parent element.
-	</p>
-</div>
-
-<div class="positionable" id="positionable1">
-	<p>
-	to position
-	</p>
-</div>
-
-<div class="positionable" id="positionable2">
-	<p>
-	to position 2
-	</p>
-</div>
-
-<div style="padding: 20px; margin-top: 75px;">
-	position...
-	<div style="padding-bottom: 20px;">
-		<b>my:</b>
-		<select id="my_horizontal">
-			<option value="left">left</option>
-			<option value="center">center</option>
-			<option value="right">right</option>
-		</select>
-		<select id="my_vertical">
-			<option value="top">top</option>
-			<option value="center">center</option>
-			<option value="bottom">bottom</option>
-		</select>
+	<div class="block blue" id="blueBlock"></div>
+	<div class="block red" id="redBlock">
+	    <div class="content">
+	        <button>Position</button> 
+	    </div>     
 	</div>
-	<div style="padding-bottom: 20px;">
-		<b>at:</b>
-		<select id="at_horizontal">
-			<option value="left">left</option>
-			<option value="center">center</option>
-			<option value="right">right</option>
-		</select>
-		<select id="at_vertical">
-			<option value="top">top</option>
-			<option value="center">center</option>
-			<option value="bottom">bottom</option>
-		</select>
-	</div>
-	<div style="padding-bottom: 20px;">
-		<b>collision:</b>
-		<select id="collision_horizontal">
-			<option value="flip">flip</option>
-			<option value="fit">fit</option>
-			<option value="flipfit">flipfit</option>
-			<option value="none">none</option>
-		</select>
-		<select id="collision_vertical">
-			<option value="flip">flip</option>
-			<option value="fit">fit</option>
-			<option value="flipfit">flipfit</option>
-			<option value="none">none</option>
-		</select>
-	</div>
-</div>
 
-<div class="demo-description">
-<p>Use the form controls to configure the positioning, or drag the positioned element to modify its offset.
-<br>Drag around the parent element to see collision detection in action.</p>
-</div>
+	<div id="uiPosition"></div>
+
 </body>
 </html>
diff --git a/ui/jquery.ui.position.js b/ui/jquery.ui.position.js
index 2d3451c06..d45b24bb1 100644
--- a/ui/jquery.ui.position.js
+++ b/ui/jquery.ui.position.js
@@ -70,7 +70,7 @@ $.position = {
 			return cachedScrollbarWidth;
 		}
 		var w1, w2,
-			div = $( "<div style='display:block;width:50px;height:50px;overflow:hidden;'><div style='height:100px;width:auto;'></div></div>" ),
+			div = $( "<div style='display:block;position:absolute;width:50px;height:50px;overflow:hidden;'><div style='height:100px;width:auto;'></div></div>" ),
 			innerDiv = div.children()[0];
 
 		$( "body" ).append( div );
