Sync ui/events to chromium @ https://codereview.chromium.org/1210203002

ui/events/event_targeter.cc

-// Copyright (c) 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "ui/events/event_targeter.h"
-
-#include "ui/events/event.h"
-#include "ui/events/event_target.h"
-#include "ui/events/event_target_iterator.h"
-
-namespace ui {
-
-EventTargeter::~EventTargeter() {
-}
-
-EventTarget* EventTargeter::FindTargetForEvent(EventTarget* root,
-                                               Event* event) {
-  if (event->IsMouseEvent() ||
-      event->IsScrollEvent() ||
-      event->IsTouchEvent() ||
-      event->IsGestureEvent()) {
-    return FindTargetForLocatedEvent(root,
-                                     static_cast<LocatedEvent*>(event));
-  }
-  return root;
-}
-
-EventTarget* EventTargeter::FindTargetForLocatedEvent(EventTarget* root,
-                                                      LocatedEvent* event) {
-  scoped_ptr<EventTargetIterator> iter = root->GetChildIterator();
-  if (iter) {
-    EventTarget* target = root;
-    for (EventTarget* child = iter->GetNextTarget(); child;
-         child = iter->GetNextTarget()) {
-      EventTargeter* targeter = child->GetEventTargeter();
-      if (!targeter)
-        targeter = this;
-      if (!targeter->SubtreeShouldBeExploredForEvent(child, *event))
-        continue;
-      target->ConvertEventToTarget(child, event);
-      target = child;
-      EventTarget* child_target =
-          targeter->FindTargetForLocatedEvent(child, event);
-      if (child_target)
-        return child_target;
-    }
-    target->ConvertEventToTarget(root, event);
-  }
-  return root->CanAcceptEvent(*event) ? root : NULL;
-}
-
-bool EventTargeter::SubtreeShouldBeExploredForEvent(EventTarget* target,
-                                                    const LocatedEvent& event) {
-  return SubtreeCanAcceptEvent(target, event) &&
-         EventLocationInsideBounds(target, event);
-}
-
-EventTarget* EventTargeter::FindNextBestTarget(EventTarget* previous_target,
-                                               Event* event) {
-  return NULL;
-}
-
-bool EventTargeter::SubtreeCanAcceptEvent(EventTarget* target,
-                                          const LocatedEvent& event) const {
-  return true;
-}
-
-bool EventTargeter::EventLocationInsideBounds(EventTarget* target,
-                                              const LocatedEvent& event) const {
-  return true;
-}
-
-}  // namespace ui