From 11b6c185e1248516964b18bed8980e06576d5cec Mon Sep 17 00:00:00 2001
From: Luke McCollum <lakemalcom@gmail.com>
Date: Mon, 17 Dec 2012 15:36:09 -0800
Subject: [PATCH 1/3] add an option to disable sensible scroll stopping

---
 portamento.js | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/portamento.js b/portamento.js
index fd43bb4..41592b7 100755
--- a/portamento.js
+++ b/portamento.js
@@ -149,6 +149,7 @@
 		var wrapper = opts.wrapper;
 		var gap = opts.gap;
 		var disableWorkaround = opts.disableWorkaround;		
+		var disableSensibleBehavior = opts.disableSensibleBehavior;
 		var fullyCapableBrowser = positionFixedSupported();
 		
 		if(panel.length != 1) {
@@ -193,7 +194,7 @@
 		
 		thisWindow.bind("scroll.portamento", function () {
 			
-			if(thisWindow.height() > panel.outerHeight() && thisWindow.width() >= (thisDocument.width() - ieFix)) { // don't scroll if the window isn't big enough
+			if(disableSensibleBehavior || (thisWindow.height() > panel.outerHeight() && thisWindow.width() >= (thisDocument.width() - ieFix))) { // don't scroll if the window isn't big enough
 				
 				var y = thisDocument.scrollTop(); // current scroll position of the document
 												
@@ -227,7 +228,7 @@
 		
 		thisWindow.bind("resize.portamento", function () {						
 			// stop users getting undesirable behaviour if they resize the window too small
-			if(thisWindow.height() <= panel.outerHeight() || thisWindow.width() < thisDocument.width()) {			
+			if(!disableSensibleBehavior && (thisWindow.height() <= panel.outerHeight() || thisWindow.width() < thisDocument.width())) {			
 				if(panel.hasClass('fixed')) {
 					panel.removeClass('fixed');
 					panel.css('top', '0');
@@ -257,7 +258,8 @@
 	$.fn.portamento.defaults = {
 	  'wrapper'				: $('body'), // the element that will act as the sliding panel's boundaries
 	  'gap'					: 10, // the gap (in pixels) left between the top of the viewport and the top of the panel
-	  'disableWorkaround' 	: false // option to disable the workaround for not-quite capable browsers 
+	  'disableWorkaround' 	: false, // option to disable the workaround for not-quite capable browsers 
+	  'disableSensibleBehavior' : false //option to stop scroll-stopping when the viewport is too small
 	};
 	
 })(jQuery);
\ No newline at end of file

From 495928322b3689b52ac892ec2c57768ed92874d5 Mon Sep 17 00:00:00 2001
From: Luke McCollum <lakemalcom@gmail.com>
Date: Tue, 18 Dec 2012 13:50:46 -0800
Subject: [PATCH 2/3] fix scroll to top on resize problem

---
 portamento.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/portamento.js b/portamento.js
index 41592b7..02f542b 100755
--- a/portamento.js
+++ b/portamento.js
@@ -192,7 +192,7 @@
 						
 		// ---------------------------------------------------------------------------------------------------
 		
-		thisWindow.bind("scroll.portamento", function () {
+		thisWindow.bind("scroll.portamento", function (event) {
 			
 			if(disableSensibleBehavior || (thisWindow.height() > panel.outerHeight() && thisWindow.width() >= (thisDocument.width() - ieFix))) { // don't scroll if the window isn't big enough
 				
@@ -214,6 +214,7 @@
 							panel.css('position', 'absolute').animate({top: (0 - float_container.viewportOffset().top + gap)});
 						}
 					}
+					event.preventDefault();
 				} else {
 					// if we're above the top scroll boundary
 					panel.removeClass('fixed');

From 2807fd525c8cf636a3f4f8290fd4ec9fe4449f35 Mon Sep 17 00:00:00 2001
From: Luke McCollum <lakemalcom@gmail.com>
Date: Mon, 30 Nov 2015 16:05:32 -0800
Subject: [PATCH 3/3] add animation/transition support, fix broken on browser
 reload issue

---
 portamento.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/portamento.js b/portamento.js
index 02f542b..a74d7ef 100755
--- a/portamento.js
+++ b/portamento.js
@@ -33,6 +33,10 @@
  * http://jqueryfordesigners.com/fixed-floating-elements/
  * 
  */
+// Delegate .transition() calls to .animate()
+// if the browser can't do CSS transitions.
+if (!$.support.transition)
+  $.fn.transition = $.fn.animate;
 (function($){
   	
 	$.fn.portamento = function(options) {
@@ -199,7 +203,7 @@
 				var y = thisDocument.scrollTop(); // current scroll position of the document
 												
 				if (y >= (topScrollBoundary)) { // if we're at or past the upper scrolling boundary
-					if((panel.innerHeight() - wrapper.viewportOffset().top) - wrapperPaddingFix + gap >= wrapper.height()) { // if we're at or past the bottom scrolling boundary
+					if((panel.innerHeight() - wrapper.viewportOffset().top) - wrapperPaddingFix + gap >= wrapper[0].scrollHeight) { // if we're at or past the bottom scrolling boundary
 						if(panel.hasClass('fixed') || thisWindow.height() >= panel.outerHeight()) { // check that there's work to do
 							panel.removeClass('fixed');
 							panel.css('top', (wrapper.height() - panel.innerHeight()) + 'px');
@@ -211,7 +215,7 @@
 							panel.css('top', gap + 'px'); // to keep the gap
 						} else {							
 							panel.clearQueue();
-							panel.css('position', 'absolute').animate({top: (0 - float_container.viewportOffset().top + gap)});
+							panel.css('position', 'absolute').transition({top: (0 - float_container.viewportOffset().top + gap)});
 						}
 					}
 					event.preventDefault();