From 7537736a0898f736d689092b9bd350886f327ab0 Mon Sep 17 00:00:00 2001
From: Stephen Blott
Date: Sat, 3 Jan 2015 18:32:47 +0000
Subject: Modes; add ConstrainedMode.

---
 content_scripts/mode.coffee | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'content_scripts/mode.coffee')

diff --git a/content_scripts/mode.coffee b/content_scripts/mode.coffee
index a19c3df0..e4e2679d 100644
--- a/content_scripts/mode.coffee
+++ b/content_scripts/mode.coffee
@@ -83,7 +83,26 @@ class MultiMode extends Mode
   exit: ->
     mode.exit() for mode in modes
 
+# When the user clicks anywhere outside of the given element, the mode is exited.
+class ConstrainedMode extends Mode
+  constructor: (@element, options) ->
+    options.name = if options.name? then "constrained-#{options.name}" else "constrained"
+    super options
+
+    @handlers.push handlerStack.push
+      "click": (event) =>
+        @exit() unless @isDOMDescendant @element, event.srcElement
+        @continueBubbling
+
+  isDOMDescendant: (parent, child) ->
+    node = child
+    while (node != null)
+      return true if (node == parent)
+      node = node.parentNode
+    false
+
 root = exports ? window
 root.Mode = Mode
 root.SingletonMode = SingletonMode
 root.MultiMode = MultiMode
+root.ConstrainedMode = ConstrainedMode
-- 
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