From b5d977d593557cfffda139a1035b1e7a6b218bca Mon Sep 17 00:00:00 2001
From: Robert Hickman <robhobbes@gmail.com>
Date: Wed, 29 May 2013 17:10:45 -0600
Subject: [PATCH] Adding an option that allows the previous and next buttons to
 wrap around past the end or beginning images.

---
 changelog.txt        |  1 +
 src/openseadragon.js |  1 +
 src/viewer.js        | 18 ++++++++++++++++--
 3 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/changelog.txt b/changelog.txt
index 9e696ade..af8a9d18 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -9,6 +9,7 @@ OPENSEADRAGON CHANGELOG
 * Keyboard handling is now done in the viewer rather than navigator (#46)
 * Additional navigator fixes (#46)
 * Fixed an error in EventHandler.removeHandler() (#48)
+* You can now choose to have previous and next buttons wrap using the config.navPrevNextWrap.
 
 0.9.127:
 
diff --git a/src/openseadragon.js b/src/openseadragon.js
index 83f417fa..ab899aa0 100644
--- a/src/openseadragon.js
+++ b/src/openseadragon.js
@@ -588,6 +588,7 @@ window.OpenSeadragon = window.OpenSeadragon || function( options ){
                     DOWN:   'next_pressed.png'
                 }
             },
+            navPrevNextWrap:        false,
 
             //DEVELOPER SETTINGS
             debugMode:              false,
diff --git a/src/viewer.js b/src/viewer.js
index a44717ee..7c7c4722 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -345,6 +345,10 @@ $.Viewer = function( options ) {
         beginControlsAutoHide( _this );
     } );    // initial fade out
 
+    if(this.navPrevNextWrap){
+        this.previousButton.enable();
+    }
+
 };
 
 $.extend( $.Viewer.prototype, $.EventHandler.prototype, $.ControlDock.prototype, {
@@ -1021,7 +1025,9 @@ $.extend( $.Viewer.prototype, $.EventHandler.prototype, $.ControlDock.prototype,
             if( this.nextButton ){
                 if( ( this.tileSources.length - 1 ) === page  ){
                     //Disable next button
-                    this.nextButton.disable();
+                    if(!this.navPrevNextWrap){
+                        this.nextButton.disable();
+                    }
                 } else {
                     this.nextButton.enable();
                 }
@@ -1031,7 +1037,9 @@ $.extend( $.Viewer.prototype, $.EventHandler.prototype, $.ControlDock.prototype,
                     //Enable previous button
                     this.previousButton.enable();
                 } else {
-                    this.previousButton.disable();
+                    if(!this.navPrevNextWrap){
+                        this.previousButton.disable();
+                    }
                 }
             }
 
@@ -1625,12 +1633,18 @@ function onFullPage() {
 
 function onPrevious(){
     var previous = THIS[ this.hash ].sequence - 1;
+    if(this.navPrevNextWrap && previous < 0){
+        previous += this.tileSources.length;
+    }
     this.goToPage( previous );
 }
 
 
 function onNext(){
     var next = THIS[ this.hash ].sequence + 1;
+    if(this.navPrevNextWrap && next >= this.tileSources.length){
+        next = 0;
+    }
     this.goToPage( next );
 }