arc: Show custom notification via notification surface

ui/arc/notification/arc_custom_notification_item.cc

+// Copyright 2016 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/arc/notification/arc_custom_notification_item.h"
+
+#include "base/memory/ptr_util.h"
+#include "base/strings/string16.h"
+#include "base/strings/utf_string_conversions.h"
+#include "components/exo/notification_surface.h"
+#include "ui/arc/notification/arc_custom_notification_view.h"
+#include "ui/message_center/notification.h"
+#include "ui/message_center/notification_types.h"
+
+namespace arc {
+
+namespace {
+
+constexpr char kNotifierId[] = "ARC_NOTIFICATION";
+
+exo::NotificationSurfaceRegistry* notification_surface_registry = nullptr;
+
+class ArcNotificationDelegate : public message_center::NotificationDelegate {
+ public:
+  ArcNotificationDelegate() {}
+
+  std::unique_ptr<views::View> CreateCustomContent() override {
+    if (!surface_)
+      return std::unique_ptr<views::View>();

[dcheng, 2016/06/22 02:23:56]

return nullptr

[xiyuan, 2016/06/22 14:36:00]

Done.

+
+    return base::WrapUnique(new ArcCustomNotificationView(surface_));

[dcheng, 2016/06/22 02:23:56]

base::MakeUnique<ArcCustomNotificationView>(surface_)

[xiyuan, 2016/06/22 14:35:59]

Done.

+  }
+
+  void set_notification_surface(exo::NotificationSurface* surface) {
+    surface_ = surface;
+  }
+
+ private:
+  // The destructor is private since this class is ref-counted.
+  ~ArcNotificationDelegate() override {}
+
+  exo::NotificationSurface* surface_ = nullptr;
+
+  DISALLOW_COPY_AND_ASSIGN(ArcNotificationDelegate);
+};
+
+}  // namespace
+
+ArcCustomNotificationItem::ArcCustomNotificationItem(
+    ArcNotificationManager* manager,
+    message_center::MessageCenter* message_center,
+    const std::string& notification_key,
+    const AccountId& profile_id)
+    : ArcNotificationItem(manager,
+                          message_center,
+                          notification_key,
+                          profile_id) {}
+
+ArcCustomNotificationItem::~ArcCustomNotificationItem() {
+  if (notification_surface_registry)
+    notification_surface_registry->RemoveObserver(this);
+}
+
+// static
+void ArcCustomNotificationItem::SetNotificationSurfaceRegistry(
+    exo::NotificationSurfaceRegistry* registry) {
+  notification_surface_registry = registry;
+}
+
+void ArcCustomNotificationItem::UpdateWithArcNotificationData(
+    const mojom::ArcNotificationData& data) {
+  DCHECK(CalledOnValidThread());
+  DCHECK(notification_key() == data.key);

[dcheng, 2016/06/22 02:23:56]

Nit: DCHECK_EQ?

[xiyuan, 2016/06/22 14:35:59]

Done.

+
+  if (CacheArcNotificationData(data))
+    return;
+
+  message_center::RichNotificationData rich_data;
+  rich_data.pinned = (data.no_clear || data.ongoing_event);
+  rich_data.priority = ConvertAndroidPriority(data.priority);
+
+  message_center::NotifierId notifier_id(
+      message_center::NotifierId::SYSTEM_COMPONENT, kNotifierId);
+  notifier_id.profile_id = profile_id().GetUserEmail();
+
+  DCHECK(!data.title.is_null());
+  DCHECK(!data.message.is_null());
+  SetNotification(base::WrapUnique(new message_center::Notification(

[dcheng, 2016/06/22 02:23:56]

Nit: base::MakeUnique<message_center::Notification>(...)

[xiyuan, 2016/06/22 14:35:59]

Done.

+      message_center::NOTIFICATION_TYPE_CUSTOM, notification_id(),
+      base::UTF8ToUTF16(data.title.get()),
+      base::UTF8ToUTF16(data.message.get()), gfx::Image(),
+      base::UTF8ToUTF16("arc"),  // display source
+      GURL(),                    // empty origin url, for system component
+      notifier_id, rich_data, new ArcNotificationDelegate())));
+
+  exo::NotificationSurface* surface =
+      notification_surface_registry->GetSurface(notification_key());
+  if (surface)
+    OnNotificationSurfaceAdded(surface);
+  else
+    notification_surface_registry->AddObserver(this);
+}
+
+void ArcCustomNotificationItem::OnNotificationSurfaceAdded(
+    exo::NotificationSurface* surface) {
+  if (!pending_notification() ||
+      surface->notification_id() != notification_key())
+    return;
+
+  static_cast<ArcNotificationDelegate*>(pending_notification()->delegate())
+      ->set_notification_surface(surface);
+  AddToMessageCenter();
+}
+
+void ArcCustomNotificationItem::OnNotificationSurfaceRemoved(
+    exo::NotificationSurface* surface) {
+  if (surface->notification_id() != notification_key())
+    return;
+
+  OnClosedFromAndroid(false);
+}
+
+}  // namespace arc