Make a pure mojo::View version of the aura::Window FocusController.

mojo/services/window_manager/view_target.cc

+// Copyright 2014 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 "mojo/services/window_manager/view_target.h"
+
+#include "mojo/services/public/cpp/view_manager/view.h"
+#include "mojo/services/window_manager/window_manager_app.h"
+#include "ui/events/event.h"
+#include "ui/events/event_target_iterator.h"
+#include "ui/events/event_targeter.h"
+
+namespace mojo {
+
+class ViewTargeter : public ui::EventTargeter {};
+
+ViewTarget::ViewTarget(WindowManagerApp* app, View* view_to_wrap)
+    : app_(app),
+      view_(view_to_wrap) {
+}
+
+ViewTarget::~ViewTarget() {
+  // We don't own our children or |view_|.
+}
+
+bool ViewTarget::HasParent() const {
+  return view_->parent();
+}
+
+bool ViewTarget::IsVisible() const {
+  return view_->visible();
+}
+
+void ViewTarget::AddChild(ViewTarget* view) {
+  children_.push_back(view);
+}
+
+scoped_ptr<ViewTargeter> ViewTarget::SetEventTargeter(
+    scoped_ptr<ViewTargeter> targeter) {
+  scoped_ptr<ViewTargeter> old_targeter = targeter_.Pass();
+  targeter_ = targeter.Pass();
+  return old_targeter.Pass();
+}
+
+bool ViewTarget::CanAcceptEvent(const ui::Event& event) {
+  // We need to make sure that a touch cancel event and any gesture events it
+  // creates can always reach the window. This ensures that we receive a valid
+  // touch / gesture stream.
+  if (event.IsEndingEvent())
+    return true;
+
+  if (!view_->visible())
+    return false;
+
+  // The top-most window can always process an event.
+  if (!view_->parent())
+    return true;
+
+  // For located events (i.e. mouse, touch etc.), an assumption is made that
+  // windows that don't have a default event-handler cannot process the event
+  // (see more in GetWindowForPoint()). This assumption is not made for key
+  // events.
+  return event.IsKeyEvent() || target_handler();
+}
+
+ui::EventTarget* ViewTarget::GetParentTarget() {
+  if (!view_->parent()) {
+    // We are the root node.
+    return nullptr;
+  }
+
+  return app_->GetViewTargetForViewId(view_->parent()->id());
+}
+
+scoped_ptr<ui::EventTargetIterator> ViewTarget::GetChildIterator() const {
+  return scoped_ptr<ui::EventTargetIterator>(
+      new ui::EventTargetIteratorImpl<ViewTarget>(children_));
+}
+
+ui::EventTargeter* ViewTarget::GetEventTargeter() {
+  return targeter_.get();
+}
+
+void ViewTarget::ConvertEventToTarget(ui::EventTarget* target,
+                                      ui::LocatedEvent* event) {
+  // TODO(erg): Actually doing enabling this line requires doing some partially
+  // specialized template cruft. Punt for now.
+  //
+  // event->ConvertLocationToTarget(this,
+  //                                static_cast<ViewTarget*>(target));
+}
+
+}  // namespace mojo