From 02ddb7a2f7398ec1fa9faeb29fb39354d3b7bf0b Mon Sep 17 00:00:00 2001
From: Francesco Cretti <francesco.cretti@gmail.com>
Date: Wed, 20 Jun 2018 18:45:38 +0200
Subject: [PATCH] preventDefaultAction in canvas-drag on minimap

---
 src/navigator.js | 32 ++++++++++++++++++++++++++++++--
 1 file changed, 30 insertions(+), 2 deletions(-)

diff --git a/src/navigator.js b/src/navigator.js
index 4c9848cf..6c05e3f7 100644
--- a/src/navigator.js
+++ b/src/navigator.js
@@ -417,8 +417,36 @@ function onCanvasClick( event ) {
  * @function
  */
 function onCanvasDrag( event ) {
-    if ( this.viewer.viewport ) {
-        if( !this.panHorizontal ){
+    var canvasDragEventArgs = {
+      tracker: event.eventSource,
+      position: event.position,
+      delta: event.delta,
+      speed: event.speed,
+      direction: event.direction,
+      shift: event.shift,
+      originalEvent: event.originalEvent,
+      preventDefaultAction: event.preventDefaultAction
+    };
+    /**
+     * Raised when a click event occurs on the {@link OpenSeadragon.Viewer#navigator} element.
+     *
+     * @event navigator-click
+     * @memberof OpenSeadragon.Viewer
+     * @type {object}
+     * @property {OpenSeadragon.Viewer} eventSource - A reference to the Viewer which raised this event.
+     * @property {OpenSeadragon.MouseTracker} tracker - A reference to the MouseTracker which originated this event.
+     * @property {OpenSeadragon.Point} position - The position of the event relative to the tracked element.
+     * @property {Boolean} quick - True only if the clickDistThreshold and clickTimeThreshold are both passed. Useful for differentiating between clicks and drags.
+     * @property {Boolean} shift - True if the shift key was pressed during this event.
+     * @property {Object} originalEvent - The original DOM event.
+     * @property {?Object} userData - Arbitrary subscriber-defined object.
+     * @property {Boolean} preventDefaultAction - Set to true to prevent default click to zoom behaviour. Default: false.
+     */
+
+     this.viewer.raiseEvent('navigator-drag', canvasDragEventArgs);
+
+     if ( !canvasDragEventArgs.preventDefaultAction && this.viewer.viewport ) {
+       if( !this.panHorizontal ){
             event.delta.x = 0;
         }
         if( !this.panVertical ){