From 3dbebea530945992a7bdabb90ddbfcc4c0027199 Mon Sep 17 00:00:00 2001
From: jonataswalker <jonataswalker@gmail.com>
Date: Mon, 23 May 2016 14:56:34 -0300
Subject: [PATCH 1/2] Add  event

---
 src/js/constants.js |  4 ++++
 src/js/internal.js  | 12 +++++++++---
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/src/js/constants.js b/src/js/constants.js
index d0e7a59..99b7adb 100644
--- a/src/js/constants.js
+++ b/src/js/constants.js
@@ -2,6 +2,10 @@ import * as vars from '../../config/vars.json';
 import utils from './utils';
 
 export const eventType = {
+  /**
+   * Triggered before context menu is openned.
+   */
+  BEFOREOPEN: 'beforeopen',
   /**
    * Triggered when context menu is openned.
    */
diff --git a/src/js/internal.js b/src/js/internal.js
index 1d75b56..7eea533 100644
--- a/src/js/internal.js
+++ b/src/js/internal.js
@@ -110,7 +110,7 @@ export class Internal {
     this.Base.dispatchEvent({
       type: constants.eventType.OPEN,
       pixel: pixel,
-      coordinate: coordinate,
+      coordinate: coordinate
     });
   }
 
@@ -130,15 +130,21 @@ export class Internal {
         map = this.map,
         canvas = map.getTargetElement(),
         menu = function(evt) {
+          this_.coordinate_clicked = map.getEventCoordinate(evt);
+          this_.pixel_clicked = map.getEventPixel(evt);
 
+          this_.Base.dispatchEvent({
+            type: constants.eventType.BEFOREOPEN,
+            pixel: this_.pixel_clicked,
+            coordinate: this_.coordinate_clicked
+          });
+          
           if (this_.Base.disabled) {
             return;
           }
 
           evt.stopPropagation();
           evt.preventDefault();
-          this_.coordinate_clicked = map.getEventCoordinate(evt);
-          this_.pixel_clicked = map.getEventPixel(evt);
           this_.openMenu(this_.pixel_clicked, this_.coordinate_clicked);
           
           //one-time fire

From 582025d19c5e55f195f5b7060eb98923e85790bc Mon Sep 17 00:00:00 2001
From: jonataswalker <jonataswalker@gmail.com>
Date: Mon, 23 May 2016 15:02:39 -0300
Subject: [PATCH 2/2] Add beforeopen event

---
 README.md | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index a47f77f..939d2f9 100644
--- a/README.md
+++ b/README.md
@@ -159,13 +159,30 @@ Get an array of default items.
 
 ## Events
 
-#### Listen and make some changes before context menu opens
+#### If you want to disable this plugin under certain circumstances, listen to `beforeopen`
+
+```javascript
+contextmenu.on('beforeopen', function(evt){
+  var feature = map.forEachFeatureAtPixel(evt.pixel, function(ft, l){
+    return ft;
+  });
+
+  if (feature) { // open only on features
+    contextmenu.disable();
+  } else {
+    contextmenu.enable();
+  }
+});
+```
+
+#### Listen and make some changes when context menu opens
 
 ```javascript
 contextmenu.on('open', function(evt){
   var feature = map.forEachFeatureAtPixel(evt.pixel, function(ft, l){
     return ft;
   });
+
   if (feature) {
     // add some other items to the menu
   }