From be47c18fe9e173b0de32f3bb73139b45805f7823 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tiago=20Rolda=CC=83o?= <focus5.6@gmail.com>
Date: Sun, 1 Oct 2017 11:46:35 +0100
Subject: [PATCH] Added events to manager, to play well with routers

---
 src/Manager.js | 14 ++++++++++++++
 src/index.js   |  1 +
 2 files changed, 15 insertions(+)

diff --git a/src/Manager.js b/src/Manager.js
index 6d74f72..72ad053 100644
--- a/src/Manager.js
+++ b/src/Manager.js
@@ -14,9 +14,21 @@ class Manager {
     this.anchors = {}
     this.forcedHash = false
     this.config = defaultConfig
+    this.hashChangeListeners = []
 
     this.scrollHandler = debounce(this.handleScroll, 100)
     this.forceHashUpdate = debounce(this.handleHashChange, 1)
+    this.triggerHashChangeEvent = (hash, affectHistory) => {
+      this.hashChangeListeners.forEach(fn => fn(hash, affectHistory))
+    }
+  }
+
+  onHashChange = (fn) => {
+    this.hashChangeListeners.push(fn);
+
+    return () => {
+      this.hashChangeListeners.splice(this.hashChangeListeners.indexOf(fn), 1);
+    }
   }
 
   addListeners = () => {
@@ -66,8 +78,10 @@ class Manager {
     if (bestAnchorId && getHash() !== bestAnchorId) {
       this.forcedHash = true
       updateHash(bestAnchorId, false)
+      this.triggerHashChangeEvent(bestAnchorId, false)
     } else if (!bestAnchorId && !keepLastAnchorHash) {
       removeHash()
+      this.triggerHashChangeEvent('', false)
     }
   }
 
diff --git a/src/index.js b/src/index.js
index 1e20c08..27f17e6 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,6 +1,7 @@
 import Manager from './Manager'
 export const goToTop = Manager.goToTop
 export const configureAnchors = Manager.configure
+export const onHashChange = Manager.onHashChange
 
 export { updateHash as goToAnchor, removeHash } from './utils/hash'
 export { default } from './ScrollableAnchor'