From c55977d2ef602131ec39bfc2686d6a6dc2dbcf03 Mon Sep 17 00:00:00 2001
From: jzaefferer <joern.zaefferer@gmail.com>
Date: Thu, 28 Oct 2010 19:15:27 +0200
Subject: [PATCH] Menu: Refactored next/previousPage logic and
 activate-scrolling, improved much!

---
 tests/visual/menu/menu.html |  1 -
 ui/jquery.ui.menu.js        | 59 ++++++++++++++++++-------------------
 2 files changed, 29 insertions(+), 31 deletions(-)

diff --git a/tests/visual/menu/menu.html b/tests/visual/menu/menu.html
index 6388b1053..1247fd7ea 100644
--- a/tests/visual/menu/menu.html
+++ b/tests/visual/menu/menu.html
@@ -8,7 +8,6 @@
 	<script type="text/javascript" src="../../../ui/jquery.ui.core.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.widget.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.menu.js"></script>
-	<script type="text/javascript" src="http://jqueryui.com/themeroller/themeswitchertool/"></script>
 	<script type="text/javascript">
 	$(function() {
 		$.fn.themeswitcher && $('<div/>').css({
diff --git a/ui/jquery.ui.menu.js b/ui/jquery.ui.menu.js
index 94df804f6..58127566d 100644
--- a/ui/jquery.ui.menu.js
+++ b/ui/jquery.ui.menu.js
@@ -122,13 +122,16 @@ $.widget("ui.menu", {
 	activate: function( event, item ) {
 		this.deactivate();
 		if ( this._hasScroll() ) {
-			var offset = item.offset().top - this.element.offset().top,
+			var borderTop = parseFloat( $.curCSS( this.element[0], "borderTopWidth", true) ) || 0,
+				paddingtop = parseFloat( $.curCSS( this.element[0], "paddingTop", true) ) || 0,
+				offset = item.offset().top - this.element.offset().top - borderTop - paddingtop,
 				scroll = this.element.attr( "scrollTop" ),
-				elementHeight = this.element.height();
-			if (offset < 0) {
+				elementHeight = this.element.height(),
+				itemHeight = item.height();
+			if ( offset < 0 ) {
 				this.element.attr( "scrollTop", scroll + offset );
-			} else if (offset > elementHeight) {
-				this.element.attr( "scrollTop", scroll + offset - elementHeight + item.height() );
+			} else if ( offset + itemHeight > elementHeight ) {
+				this.element.attr( "scrollTop", scroll + offset - elementHeight + itemHeight );
 			}
 		}
 		this.active = item.first()
@@ -187,19 +190,16 @@ $.widget("ui.menu", {
 			}
 			var base = this.active.offset().top,
 				height = this.element.height(),
-				// TODO replace children with nextAll
-				// TODO replace filter with each, break once close > 0 and use that item as the result 
-				result = this.element.children( ".ui-menu-item" ).filter( function() {
-					var close = $( this ).offset().top - base - height + $( this ).height();
-					// TODO replace with check close > 0
-					return close < 10 && close > -10;
-				});
-
-			// TODO try to catch this earlier when scrollTop indicates the last page anyway
-			if ( !result.length ) {
-				result = this.element.children( ".ui-menu-item" ).last();
-			}
-			this.activate( event, result );
+				result;
+			this.active.nextAll( ".ui-menu-item" ).each( function() {
+				var close = $( this ).offset().top - base - height;
+				if (close >= 0) {
+					result = $( this );
+					return false;
+				}
+			});
+
+			this.activate( event, result || this.element.children( ".ui-menu-item" ).last() );
 		} else {
 			this.activate( event, this.element.children( ".ui-menu-item" )
 				// TODO use .first()/.last()
@@ -216,18 +216,17 @@ $.widget("ui.menu", {
 			}
 
 			var base = this.active.offset().top,
-				height = this.element.height();
-				result = this.element.children( ".ui-menu-item" ).filter( function() {
-					var close = $(this).offset().top - base + height - $(this).height();
-					// TODO improve approximation
-					return close < 10 && close > -10;
-				});
-
-			// TODO try to catch this earlier when scrollTop indicates the last page anyway
-			if (!result.length) {
-				result = this.element.children( ".ui-menu-item" ).first();
-			}
-			this.activate( event, result );
+				height = this.element.height(),
+				result;
+			this.active.prevAll( ".ui-menu-item" ).each( function() {
+				var close = $(this).offset().top - base + height;
+				if (close <= 0) {
+					result = $( this );
+					return false;
+				}
+			});
+
+			this.activate( event, result || this.element.children( ".ui-menu-item" ).first() );
 		} else {
 			this.activate( event, this.element.children( ".ui-menu-item" )
 				// TODO use .first()/.last()
-- 
2.39.5