From 87bb5c24549e7b90b9f03ca7e345b9cecf49191c Mon Sep 17 00:00:00 2001
From: Taras Mankovski <tarasm@gmail.com>
Date: Mon, 6 Jun 2016 13:07:18 -0400
Subject: [PATCH] Added onScrollEnd hook

---
 .gitignore                             |  3 ++-
 demo/index.html                        | 12 ++++++++++--
 jquery.trackpad-scroll-emulator.js     | 14 ++++++++++++++
 jquery.trackpad-scroll-emulator.min.js |  2 +-
 4 files changed, 27 insertions(+), 4 deletions(-)

diff --git a/.gitignore b/.gitignore
index b512c09..a088b6f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
-node_modules
\ No newline at end of file
+node_modules
+bower_components
diff --git a/demo/index.html b/demo/index.html
index d0cbbb7..6ad6331 100644
--- a/demo/index.html
+++ b/demo/index.html
@@ -97,8 +97,16 @@ <h2>Horizontal scroller</h2>
   <script>
   $(document).ready(function() {
     // Initialize scrollers.
-    $('.demo1').TrackpadScrollEmulator();
-    $('.demo2').TrackpadScrollEmulator();
+    $('.demo1').TrackpadScrollEmulator({
+      onScrollEnd: function() {
+        alert('at the end');
+      }
+    });
+    $('.demo2').TrackpadScrollEmulator({
+      onScrollEnd: function() {
+        alert('at the end');
+      }
+    });
     // Demonstration of changing the vertical scroller content and dimensions.
     $('.add-more').on('click', function(e){
       e.preventDefault();
diff --git a/jquery.trackpad-scroll-emulator.js b/jquery.trackpad-scroll-emulator.js
index d0ca0fc..140439e 100644
--- a/jquery.trackpad-scroll-emulator.js
+++ b/jquery.trackpad-scroll-emulator.js
@@ -139,6 +139,18 @@
      */
     function onScrolled(e) {
       flashScrollbar();
+      checkScrollEnd();
+    }
+
+    function checkScrollEnd() {
+      var contentSize = sizeAttr === 'height' ? $contentEl.outerHeight() : $contentEl.outerWidth();
+      var scrollOffset = $scrollContentEl[scrollOffsetAttr](); // Either scrollTop() or scrollLeft().
+      var scrollbarSize = $scrollbarEl[sizeAttr]();
+      
+      var endReached = scrollOffset + scrollbarSize + options.scrollBuffer >= contentSize;
+      if (endReached) {
+        hook('onScrollEnd');
+      }
     }
 
     /**
@@ -322,6 +334,8 @@
   $.fn[pluginName].defaults = {
     onInit: function() {},
     onDestroy: function() {},
+    onScrollEnd: function() {},
+    scrollBuffer: 50,
     wrapContent: true,
     autoHide: true
   };
diff --git a/jquery.trackpad-scroll-emulator.min.js b/jquery.trackpad-scroll-emulator.min.js
index eae0d16..f32b549 100644
--- a/jquery.trackpad-scroll-emulator.min.js
+++ b/jquery.trackpad-scroll-emulator.min.js
@@ -4,4 +4,4 @@
  * Author: Jonathan Nicol @f6design
  * https://github.com/jnicol/trackpad-scroll-emulator
  */
-!function(a){function b(b,d){function e(){A.hasClass("horizontal")&&(D="horiz",E="scrollLeft",F="width",G="left"),A.prepend('<div class="tse-scrollbar"><div class="drag-handle"></div></div>'),v=A.find(".tse-scrollbar:first"),w=A.find(".drag-handle:first"),d.wrapContent&&B.wrap('<div class="tse-scroll-content" />'),u=A.find(".tse-scroll-content:first"),o(),d.autoHide&&A.on("mouseenter",l),w.on("mousedown",f),v.on("mousedown",i),u.on("scroll",j),k(),a(window).on("resize.trackpadScollEmulator",q),d.autoHide||m()}function f(b){b.preventDefault();var c=b.pageY;"horiz"===D&&(c=b.pageX),x=c-w.offset()[G],a(document).on("mousemove",g),a(document).on("mouseup",h)}function g(a){a.preventDefault();var b=a.pageY;"horiz"===D&&(b=a.pageX);var c=b-v.offset()[G]-x,d=c/v[F](),e=d*B[F]();u[E](e)}function h(){a(document).off("mousemove",g),a(document).off("mouseup",h)}function i(a){if(a.target!==w[0]){var b=C*u[F](),c="vert"===D?a.originalEvent.layerY:a.originalEvent.layerX,d=w.position()[G],e=d>c?u[E]()-b:u[E]()+b;u[E](e)}}function j(){l()}function k(){var a="height"===F?B.outerHeight():B.outerWidth(),b=u[E](),c=v[F](),d=c/a,e=Math.round(d*b)+2,f=Math.floor(d*(c-2))-2;a>c?(w.css("vert"===D?{top:e,height:f}:{left:e,width:f}),v.show()):v.hide()}function l(){k(),m()}function m(){w.addClass("visible"),d.autoHide&&("number"==typeof y&&window.clearTimeout(y),y=window.setTimeout(function(){n()},1e3))}function n(){w.removeClass("visible"),"number"==typeof y&&window.clearTimeout(y)}function o(){"vert"===D?(u.width(A.width()+p()),u.height(A.height())):(u.width(A.width()),u.height(A.height()+p()),B.height(A.height()))}function p(){var b=a('<div class="scrollbar-width-tester" style="width:50px;height:50px;overflow-y:scroll;position:absolute;top:-200px;left:-200px;"><div style="height:100px;"></div>');a("body").append(b);var c=a(b).innerWidth(),d=a("div",b).innerWidth();return b.remove(),c===d&&navigator.userAgent.toLowerCase().indexOf("firefox")>-1?17:c-d}function q(){o(),k()}function r(a,b){return b?void(d[a]=b):d[a]}function s(){B.insertBefore(v),v.remove(),u.remove(),B.css({height:A.height()+"px","overflow-y":"scroll"}),a(window).off("resize.trackpadScollEmulator"),t("onDestroy"),A.removeData("plugin_"+c)}function t(a){void 0!==d[a]&&d[a].call(z)}var u,v,w,x,y,z=b,A=a(b),B=A.find(".tse-content:first"),C=7/8,D="vert",E="scrollTop",F="height",G="top";return d=a.extend({},a.fn[c].defaults,d),e(),{option:r,destroy:s,recalculate:q}}var c="TrackpadScrollEmulator";a.fn[c]=function(d){if("string"==typeof arguments[0]){var e,f=arguments[0],g=Array.prototype.slice.call(arguments,1);return this.each(function(){if(!a.data(this,"plugin_"+c)||"function"!=typeof a.data(this,"plugin_"+c)[f])throw new Error("Method "+f+" does not exist on jQuery."+c);e=a.data(this,"plugin_"+c)[f].apply(this,g)}),void 0!==e?e:this}return"object"!=typeof d&&d?void 0:this.each(function(){a.data(this,"plugin_"+c)||a.data(this,"plugin_"+c,new b(this,d))})},a.fn[c].defaults={onInit:function(){},onDestroy:function(){},wrapContent:!0,autoHide:!0}}(jQuery);
\ No newline at end of file
+!function(a){function b(b,d){function e(){B.hasClass("horizontal")&&(E="horiz",F="scrollLeft",G="width",H="left"),B.prepend('<div class="tse-scrollbar"><div class="drag-handle"></div></div>'),w=B.find(".tse-scrollbar:first"),x=B.find(".drag-handle:first"),d.wrapContent&&C.wrap('<div class="tse-scroll-content" />'),v=B.find(".tse-scroll-content:first"),p(),d.autoHide&&B.on("mouseenter",m),x.on("mousedown",f),w.on("mousedown",i),v.on("scroll",j),l(),a(window).on("resize.trackpadScollEmulator",r),d.autoHide||n()}function f(b){b.preventDefault();var c=b.pageY;"horiz"===E&&(c=b.pageX),y=c-x.offset()[H],a(document).on("mousemove",g),a(document).on("mouseup",h)}function g(a){a.preventDefault();var b=a.pageY;"horiz"===E&&(b=a.pageX);var c=b-w.offset()[H]-y,d=c/w[G](),e=d*C[G]();v[F](e)}function h(){a(document).off("mousemove",g),a(document).off("mouseup",h)}function i(a){if(a.target!==x[0]){var b=D*v[G](),c="vert"===E?a.originalEvent.layerY:a.originalEvent.layerX,d=x.position()[H],e=d>c?v[F]()-b:v[F]()+b;v[F](e)}}function j(){m(),k()}function k(){var a="height"===G?C.outerHeight():C.outerWidth(),b=v[F](),c=w[G](),e=b+c+d.scrollBuffer>=a;e&&u("onScrollEnd")}function l(){var a="height"===G?C.outerHeight():C.outerWidth(),b=v[F](),c=w[G](),d=c/a,e=Math.round(d*b)+2,f=Math.floor(d*(c-2))-2;a>c?(x.css("vert"===E?{top:e,height:f}:{left:e,width:f}),w.show()):w.hide()}function m(){l(),n()}function n(){x.addClass("visible"),d.autoHide&&("number"==typeof z&&window.clearTimeout(z),z=window.setTimeout(function(){o()},1e3))}function o(){x.removeClass("visible"),"number"==typeof z&&window.clearTimeout(z)}function p(){"vert"===E?(v.width(B.width()+q()),v.height(B.height())):(v.width(B.width()),v.height(B.height()+q()),C.height(B.height()))}function q(){var b=a('<div class="scrollbar-width-tester" style="width:50px;height:50px;overflow-y:scroll;position:absolute;top:-200px;left:-200px;"><div style="height:100px;"></div>');a("body").append(b);var c=a(b).innerWidth(),d=a("div",b).innerWidth();return b.remove(),c===d&&navigator.userAgent.toLowerCase().indexOf("firefox")>-1?17:c-d}function r(){p(),l()}function s(a,b){return b?void(d[a]=b):d[a]}function t(){C.insertBefore(w),w.remove(),v.remove(),C.css({height:B.height()+"px","overflow-y":"scroll"}),a(window).off("resize.trackpadScollEmulator"),u("onDestroy"),B.removeData("plugin_"+c)}function u(a){void 0!==d[a]&&d[a].call(A)}var v,w,x,y,z,A=b,B=a(b),C=B.find(".tse-content:first"),D=7/8,E="vert",F="scrollTop",G="height",H="top";return d=a.extend({},a.fn[c].defaults,d),e(),{option:s,destroy:t,recalculate:r}}var c="TrackpadScrollEmulator";a.fn[c]=function(d){if("string"==typeof arguments[0]){var e,f=arguments[0],g=Array.prototype.slice.call(arguments,1);return this.each(function(){if(!a.data(this,"plugin_"+c)||"function"!=typeof a.data(this,"plugin_"+c)[f])throw new Error("Method "+f+" does not exist on jQuery."+c);e=a.data(this,"plugin_"+c)[f].apply(this,g)}),void 0!==e?e:this}return"object"!=typeof d&&d?void 0:this.each(function(){a.data(this,"plugin_"+c)||a.data(this,"plugin_"+c,new b(this,d))})},a.fn[c].defaults={onInit:function(){},onDestroy:function(){},onScrollEnd:function(){},scrollBuffer:50,wrapContent:!0,autoHide:!0}}(jQuery);
\ No newline at end of file