Get event targetting working for mouse events.

ui/events/event_target_iterator.h

Index: ui/events/event_target_iterator.h
diff --git a/ui/events/event_target_iterator.h b/ui/events/event_target_iterator.h
index 28b4a30202a3fa2e29d1f32520188f2ac5bb06cb..2adc62cd1f2941dcd67a81a64bbbcb14148ed159 100644
--- a/ui/events/event_target_iterator.h
+++ b/ui/events/event_target_iterator.h
@@ -43,6 +43,32 @@ class EventTargetIteratorImpl : public EventTargetIterator {
   typename std::vector<T*>::const_reverse_iterator end_;
 };
 
+// Provides a version which keeps a copy of the data (for when it has to be
+// derived instead of pointed at).
+template<typename T>
+class CopyingEventTargetIteratorImpl : public EventTargetIterator {
+ public:
+  explicit CopyingEventTargetIteratorImpl(const std::vector<T*>& children)
+      : children_(children),
+        begin_(children_.rbegin()),
+        end_(children_.rend()) {
+  }
+  virtual ~CopyingEventTargetIteratorImpl() {}

[sky, 2014/11/14 01:43:57]

nit: no virtual, just override.

+
+  virtual EventTarget* GetNextTarget() override {

[sky, 2014/11/14 01:43:57]

same thing, no virtual, just override.

+    if (begin_ == end_)
+      return NULL;

[sky, 2014/11/14 01:43:57]

nullptr.

+    EventTarget* target = *(begin_);
+    ++begin_;
+    return target;
+  }
+
+ private:
+  typename std::vector<T*> children_;
+  typename std::vector<T*>::const_reverse_iterator begin_;
+  typename std::vector<T*>::const_reverse_iterator end_;
+};
+
 }  // namespace ui
 
 #endif  // UI_EVENTS_EVENT_TARGET_ITERATOR_H_