Open the file dragged to window.

spec/app/window-spec.coffee

@@ -198,3 +198,31 @@ describe "Window", ->
           expect(deserialize({ deserializer: 'Foo', version: 3, name: 'Bar' })).toBeUndefined()
           expect(deserialize({ deserializer: 'Foo', version: 1, name: 'Bar' })).toBeUndefined()
           expect(deserialize({ deserializer: 'Foo', name: 'Bar' })).toBeUndefined()
+
+  describe "drag and drop", ->
+    buildDragEvent = (type, files) ->
+      dataTransfer =
+        files: files
+        data: {}
+        setData: (key, value) -> @data[key] = value
+        getData: (key) -> @data[key]
+
+      event = $.Event(type)
+      event.originalEvent = { dataTransfer }
+      event.preventDefault = ->
+      event.stopPropagation = ->
+      event
+
+    describe "when a file is dragged to window", ->
+      it "opens it", ->
+        spyOn(atom, "open")
+        event = buildDragEvent("drop", [ {path: "/fake1"}, {path: "/fake2"} ])
+        window.onDrop(event)
+        expect(atom.open.callCount).toBe 2
+
+    describe "when a non-file is dragged to window", ->
+      it "does nothing", ->
+        spyOn(atom, "open")
+        event = buildDragEvent("drop", [])
+        window.onDrop(event)
+        expect(atom.open).not.toHaveBeenCalled()

src/app/window.coffee

@@ -25,12 +25,6 @@ window.setUpEnvironment = ->
   $(document).on 'keydown', keymap.handleKeyEvent
   keymap.bindDefaultKeys()
 
-  ignoreEvents = (e) ->
-    e.preventDefault()
-    e.stopPropagation()
-  $(document).on 'dragover', ignoreEvents
-  $(document).on 'drop', ignoreEvents
-
   requireStylesheet 'reset'
   requireStylesheet 'atom'
   requireStylesheet 'overlay'
@@ -50,6 +44,7 @@ window.startup = ->
     console.warn "Failed to install `atom` binary"
 
   handleWindowEvents()
+  handleDragDrop()
   config.load()
   keymap.loadBundledKeymaps()
   atom.loadThemes()
@@ -93,6 +88,18 @@ window.handleWindowEvents = ->
   $(window).command 'window:close', => confirmClose()
   $(window).command 'window:reload', => reload()
 
+window.handleDragDrop = ->
+  $(document).on 'dragover', (e) ->
+    e.preventDefault()
+    e.stopPropagation()
+  $(document).on 'drop', onDrop
+
+window.onDrop = (e) ->
+  e.preventDefault()
+  e.stopPropagation()
+  for file in e.originalEvent.dataTransfer.files
+    atom.open(file.path)
+
 window.deserializeWindowState = ->
   RootView = require 'root-view'
   Project = require 'project'