Rework unhovering to occur automatically for all simulated hovers

1 files changed, 20 insertions, 7 deletions

diff --git a/lib/dom_utils.coffee b/lib/dom_utils.coffee
index 06a02180..7473df17 100644
--- a/lib/dom_utils.coffee
+++ b/lib/dom_utils.coffee
@@ -241,13 +241,26 @@ DomUtils =
     for event in eventSequence
       @simulateMouseEvent event, element, modifiers
 
-  simulateMouseEvent: (event, element, modifiers = {}) ->
-    mouseEvent = document.createEvent("MouseEvents")
-    mouseEvent.initMouseEvent(event, true, true, window, 1, 0, 0, 0, 0, modifiers.ctrlKey, modifiers.altKey,
-    modifiers.shiftKey, modifiers.metaKey, 0, null)
-    # Debugging note: Firefox will not execute the element's default action if we dispatch this click event,
-    # but Webkit will. Dispatching a click on an input box does not seem to focus it; we do that separately
-    element.dispatchEvent(mouseEvent)
+  simulateMouseEvent: do ->
+    lastHoveredElement = undefined
+    (event, element, modifiers = {}) ->
+
+      if event == "mouseout"
+        element ?= lastHoveredElement # Allow unhovering the last hovered element by passing undefined.
+        lastHoveredElement = undefined
+        return unless element?
+
+      else if event == "mouseover"
+        # Simulate moving the mouse off the previous element first, as if we were a real mouse.
+        @simulateMouseEvent "mouseout", undefined, modifiers
+        lastHoveredElement = element
+
+      mouseEvent = document.createEvent("MouseEvents")
+      mouseEvent.initMouseEvent(event, true, true, window, 1, 0, 0, 0, 0, modifiers.ctrlKey, modifiers.altKey,
+      modifiers.shiftKey, modifiers.metaKey, 0, null)
+      # Debugging note: Firefox will not execute the element's default action if we dispatch this click event,
+      # but Webkit will. Dispatching a click on an input box does not seem to focus it; we do that separately
+      element.dispatchEvent(mouseEvent)
 
   # momentarily flash a rectangular border to give user some visual feedback
   flashRect: (rect) ->