From ec88f94e787745e8043a17d9aae9aa77f9bb8e05 Mon Sep 17 00:00:00 2001
From: Niels van Hoorn <nvh@nvh.io>
Date: Wed, 14 Sep 2016 17:23:21 +0200
Subject: [PATCH] Added deprecated event support on states

Signed-off-by: Niels van Hoorn <nvh@nvh.io>
---
 framer/LayerStates.coffee         |  3 +++
 test/tests/LayerStatesTest.coffee | 31 +++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/framer/LayerStates.coffee b/framer/LayerStates.coffee
index 2dc55e186..5cc6a5eeb 100644
--- a/framer/LayerStates.coffee
+++ b/framer/LayerStates.coffee
@@ -77,6 +77,9 @@ class exports.LayerStates
 				for name, state of layer.states
 					keys = _.union(keys, _.keys(state))
 				keys
+		deprecatedProperty @, "on", "layer.on", stateMachine, (layer) ->
+			(name, handler) ->
+				layer.on(name, handler)
 
 	@filterStateProperties: (properties) ->
 
diff --git a/test/tests/LayerStatesTest.coffee b/test/tests/LayerStatesTest.coffee
index 881914510..d2aff81c0 100644
--- a/test/tests/LayerStatesTest.coffee
+++ b/test/tests/LayerStatesTest.coffee
@@ -507,3 +507,34 @@ describe "LayerStates", ->
 			layerB.states.next(instant: true)
 			assert.equal layerB.y, 300
 			assert.equal layerB.x, 400
+
+		describe "Events", ->
+
+			beforeEach ->
+				@layer = new Layer()
+				@layer.states.add("a", {x:100, y:100})
+				@layer.states.add("b", {x:200, y:200})
+
+			it "should emit willSwitch when switching", (done) ->
+
+				test = (previous, current, states) =>
+					previous.should.equal 'initial'
+					current.should.equal 'a'
+					@layer.states.state.should.equal 'initial'
+					done()
+
+				@layer.states.on 'willSwitch', test
+				@layer.states.switchInstant 'a'
+
+			it "should emit didSwitch when switching", (done) ->
+
+				test = (previous, current, states) =>
+					previous.should.equal 'initial'
+					current.should.equal 'a'
+					@layer.states.state.should.equal 'a'
+					done()
+
+				@layer.states.on 'didSwitch', test
+				@layer.states.switchInstant 'a'
+
+