View synchronization

mojo/services/public/cpp/view_manager/lib/view.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/public/cpp/view_manager/view.h"
+
+#include "mojo/services/public/cpp/view_manager/lib/view_manager_private.h"
+#include "mojo/services/public/cpp/view_manager/lib/view_private.h"
+#include "mojo/services/public/cpp/view_manager/view_observer.h"
+
+namespace mojo {
+namespace services {
+namespace view_manager {
+
+namespace {
+class ScopedDestructionNotifier {
+ public:
+  explicit ScopedDestructionNotifier(View* view)
+      : view_(view) {
+    FOR_EACH_OBSERVER(
+        ViewObserver,
+        *ViewPrivate(view_).observers(),
+        OnViewDestroy(view_, ViewObserver::DISPOSITION_CHANGING));
+  }
+  ~ScopedDestructionNotifier() {
+    FOR_EACH_OBSERVER(
+        ViewObserver,
+        *ViewPrivate(view_).observers(),
+        OnViewDestroy(view_, ViewObserver::DISPOSITION_CHANGED));
+  }
+
+ private:
+  View* view_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedDestructionNotifier);
+};
+}  // namespace
+
+// static
+View* View::Create(ViewManager* manager) {
+  View* view = new View(manager);
+  ViewManagerPrivate(manager).AddView(view->id(), view);
+  return view;
+}
+
+void View::Destroy() {
+  if (manager_)
+    ViewManagerPrivate(manager_).synchronizer()->DestroyView(id_);
+  LocalDestroy();
+}
+
+void View::AddObserver(ViewObserver* observer) {
+  observers_.AddObserver(observer);
+}
+
+void View::RemoveObserver(ViewObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+View::View(ViewManager* manager)
+    : id_(ViewManagerPrivate(manager).synchronizer()->CreateView()),
+      node_(NULL),
+      manager_(manager) {}
+
+View::View()
+    : id_(-1),
+      node_(NULL),
+      manager_(NULL) {}
+
+View::~View() {
+  ScopedDestructionNotifier notifier(this);
+  if (manager_)
+    ViewManagerPrivate(manager_).RemoveView(id_);
+}
+
+void View::LocalDestroy() {
+  delete this;
+}
+
+}  // namespace view_manager
+}  // namespace services
+}  // namespace mojo