From 2d58d9c8b5d5fa0bb565bf949a9cdbcbb080224b Mon Sep 17 00:00:00 2001
From: Nathan Sobo <nathan@github.com>
Date: Wed, 27 Aug 2014 10:22:14 -0600
Subject: [PATCH] Add Pane::onDidActivate

---
 spec/pane-spec.coffee     | 23 +++++++++++++++++++++++
 src/pane-container.coffee |  2 ++
 src/pane.coffee           |  4 ++++
 3 files changed, 29 insertions(+)

diff --git a/spec/pane-spec.coffee b/spec/pane-spec.coffee
index ab9ba7661..2fb011124 100644
--- a/spec/pane-spec.coffee
+++ b/spec/pane-spec.coffee
@@ -28,6 +28,29 @@ describe "Pane", ->
       expect(pane.getItems().length).toBe 2
       expect(pane.getActiveItem()).toBe pane.itemAtIndex(0)
 
+  describe "::activate()", ->
+    [container, pane1, pane2] = []
+
+    beforeEach ->
+      container = new PaneContainer(root: new Pane)
+      container.getRoot().splitRight()
+      [pane1, pane2] = container.getPanes()
+
+    it "changes the active pane on the container", ->
+      expect(container.getActivePane()).toBe pane2
+      pane1.activate()
+      expect(container.getActivePane()).toBe pane1
+      pane2.activate()
+      expect(container.getActivePane()).toBe pane2
+
+    it "invokes ::onDidActivate() observers", ->
+      eventCount = 0
+      pane1.onDidActivate -> eventCount++
+      pane1.activate()
+      pane1.activate()
+      pane2.activate()
+      expect(eventCount).toBe 2
+
   describe "::addItem(item, index)", ->
     it "adds the item at the given index", ->
       pane = new Pane(items: [new Item("A"), new Item("B")])
diff --git a/src/pane-container.coffee b/src/pane-container.coffee
index 07083263a..2a3271eb5 100644
--- a/src/pane-container.coffee
+++ b/src/pane-container.coffee
@@ -36,6 +36,8 @@ class PaneContainer extends Model
     root: @root?.serialize()
     activePaneId: @activePane.id
 
+  getRoot: -> @root
+
   replaceChild: (oldChild, newChild) ->
     throw new Error("Replacing non-existent child") if oldChild isnt @root
     @root = newChild
diff --git a/src/pane.coffee b/src/pane.coffee
index fc8fee05e..e81d2f7d1 100644
--- a/src/pane.coffee
+++ b/src/pane.coffee
@@ -94,6 +94,9 @@ class Pane extends Model
   # Called by the view layer to construct a view for this model.
   getViewClass: -> PaneView ?= require './pane-view'
 
+  onDidActivate: (fn) ->
+    @emitter.on 'did-activate', fn
+
   onDidAddItem: (fn) ->
     @emitter.on 'did-add-item', fn
 
@@ -123,6 +126,7 @@ class Pane extends Model
   activate: ->
     @container?.activePane = this
     @emit 'activated'
+    @emitter.emit 'did-activate'
 
   getPanes: -> [this]