From 5309d5f24d17c0cc808eecdb50de470890272fe0 Mon Sep 17 00:00:00 2001
From: Nathan Sobo <nathan@github.com>
Date: Thu, 9 Jan 2014 15:46:32 -0700
Subject: [PATCH] Add ability to suppress blur on all focusable objects in a
 focus context

When a view receives a 'focusout' event, we relay that to the model by
calling ::blur. This is great for when users initiate the change in
focus, but 'focusout' events can *also* be caused by elements being
temporarily detached from the DOM.

The ::suppressBlur method gives the ability to ignore blur calls during
a certain operation. This is helpful, for example, when we want to
detach a model and reattach it somewhere else without changing its focus
state.
---
 src/focus-context.coffee | 10 ++++++++++
 src/focusable.coffee     | 13 +++++++++++--
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/src/focus-context.coffee b/src/focus-context.coffee
index e52b0487f..c17514471 100644
--- a/src/focus-context.coffee
+++ b/src/focus-context.coffee
@@ -3,3 +3,13 @@
 module.exports =
 class FocusContext extends Model
   @property 'focusedObject', null
+
+  blurSuppressionCounter: 0
+
+  isBlurSuppressed: ->
+    @blurSuppressionCounter > 0
+
+  suppressBlur: (fn) ->
+    @blurSuppressionCounter++
+    fn()
+    @blurSuppressionCounter--
diff --git a/src/focusable.coffee b/src/focusable.coffee
index 69c966896..c046e7cd2 100644
--- a/src/focusable.coffee
+++ b/src/focusable.coffee
@@ -12,8 +12,17 @@ class Focusable extends Mixin
 
   focus: ->
     throw new Error("Object must be assigned a focusContext to be focus") unless @focusContext
-    @focusContext.focusedObject = this
+    unless @focused
+      @suppressBlur =>
+        @focusContext.focusedObject = this
 
   blur: ->
     throw new Error("Object must be assigned a focusContext to be blurred") unless @focusContext
-    @focusContext.focusedObject = null if @focused
+    if @focused and not @focusContext.isBlurSuppressed()
+      @focusContext.focusedObject = null
+
+  suppressBlur: (fn) ->
+    if @focusContext?
+      @focusContext.suppressBlur(fn)
+    else
+      fn()