[Mac] Implement a NotificationUIManager that uses Notification Center on 10.8 for text notifications

chrome/browser/notifications/notification_ui_manager_mac.mm

+// Copyright (c) 2012 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 "chrome/browser/notifications/notification_ui_manager_mac.h"
+
+#include "base/mac/cocoa_protocols.h"
+#include "base/mac/mac_util.h"
+#include "base/sys_string_conversions.h"
+#include "chrome/browser/notifications/notification.h"
+#include "chrome/browser/notifications/notification_ui_manager_impl.h"
+
+@class NSUserNotificationCenter;
+
+// Since NSUserNotification and NSUserNotificationCenter are new classes in
+// 10.8, they cannot simply be declared with an @interface. An @implementation
+// is needed to link, but providing one would cause a runtime conflict when
+// running on 10.8. Instead, provide the interface defined as a protocol and
+// use that instead, because sizeof(id<Protocol>) == sizeof(Class*). In order to
+// instantiate, use NSClassFromString and simply assign the alloc/init'd result
+// to an instance of the proper protocol. This way the compiler, linker, and
+// loader are all happy. And the code isn't full of objc_msgSend.
+@protocol CrUserNotification <NSObject>
+@property(copy) NSString* title;
+@property(copy) NSString* subtitle;
+@property(copy) NSString* informativeText;
+@property(copy) NSString* actionButtonTitle;
+@property(copy) NSDictionary* userInfo;
+@property(copy) NSDate* deliveryDate;
+@property(copy) NSTimeZone* deliveryTimeZone;
+@property(copy) NSDateComponents* deliveryRepeatInterval;
+@property(readonly) NSDate* actualDeliveryDate;
+@property(readonly, getter=isPresented) BOOL presented;
+@property(readonly, getter=isRemote) BOOL remote;
+@property(copy) NSString* soundName;
+@property BOOL hasActionButton;
+@end
+
+@protocol CrUserNotificationCenter
++ (NSUserNotificationCenter*)defaultUserNotificationCenter;
+@property(assign) id<NSUserNotificationCenterDelegate> delegate;
+@property(copy) NSArray* scheduledNotifications;
+- (void)scheduleNotification:(id<CrUserNotification>)notification;
+- (void)removeScheduledNotification:(id<CrUserNotification>)notification;
+@property(readonly) NSArray* deliveredNotifications;
+- (void)deliverNotification:(id<CrUserNotification>)notification;
+- (void)removeDeliveredNotification:(id<CrUserNotification>)notification;
+- (void)removeAllDeliveredNotifications;
+@end
+
+////////////////////////////////////////////////////////////////////////////////
+
+namespace {
+
+// A "fun" way of saying:
+//   +[NSUserNotificationCenter defaultUserNotificationCenter].
+id<CrUserNotificationCenter> GetNotificationCenter() {
+  return [NSClassFromString(@"NSUserNotificationCenter")
+      performSelector:@selector(defaultUserNotificationCenter)];
+}
+
+// The key in NSUserNotification.userInfo that stores the C++ notification_id.
+NSString* const kNotificationIDKey = @"notification_id";
+
+}  // namespace
+
+// A Cocoa class that can be the delegate of NSUserNotificationCenter that
+// forwards commands to C++.
+@interface NotificationCenterDelegate : NSObject
+    <NSUserNotificationCenterDelegate> {
+ @private
+  NotificationUIManagerMac* manager_;  // Weak, owns self.
+}
+- (id)initWithManager:(NotificationUIManagerMac*)manager;
+@end
+
+////////////////////////////////////////////////////////////////////////////////
+
+// static
+NotificationUIManager* NotificationUIManager::Create(
+    PrefService* local_state,
+    BalloonCollection* balloons) {
+  NotificationUIManager* instance = NULL;
+  NotificationUIManagerImpl* impl = NULL;
+
+  if (base::mac::IsOSMountainLionOrLater()) {
+    NotificationUIManagerMac* mac_instance =
+        new NotificationUIManagerMac(local_state);
+    instance = mac_instance;
+    impl = mac_instance->builtin_manager();
+  } else {
+    instance = impl = new NotificationUIManagerImpl(local_state);
+  }
+
+  impl->Initialize(balloons);
+  balloons->set_space_change_listener(impl);
+
+  return instance;
+}
+
+NotificationUIManagerMac::ControllerNotification::ControllerNotification(
+    id<CrUserNotification> a_view, Notification* a_model)
+    : view(a_view),
+      model(a_model) {
+}
+
+NotificationUIManagerMac::ControllerNotification::~ControllerNotification() {
+  [view release];
+  delete model;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+NotificationUIManagerMac::NotificationUIManagerMac(PrefService* local_state)
+    : builtin_manager_(new NotificationUIManagerImpl(local_state)),
+      delegate_(ALLOW_THIS_IN_INITIALIZER_LIST(
+          [[NotificationCenterDelegate alloc] initWithManager:this])) {
+  DCHECK(!GetNotificationCenter().delegate);
+  GetNotificationCenter().delegate = delegate_.get();
+}
+
+NotificationUIManagerMac::~NotificationUIManagerMac() {
+  CancelAll();
+}
+
+void NotificationUIManagerMac::Add(const Notification& notification,
+                                   Profile* profile) {
+  if (notification.is_html()) {
+    builtin_manager_->Add(notification, profile);
+  } else {
+    id<CrUserNotification> replacee = FindNotificationWithReplacementId(
+        notification.replace_id());
+    if (replacee)
+      RemoveNotification(replacee);
+
+    // Owned by ControllerNotification.
+    id<CrUserNotification> ns_notification =
+        [[NSClassFromString(@"NSUserNotification") alloc] init];
+
+    ns_notification.title = base::SysUTF16ToNSString(notification.title());
+    ns_notification.subtitle =
+        base::SysUTF16ToNSString(notification.display_source());
+    ns_notification.informativeText =
+        base::SysUTF16ToNSString(notification.body());
+    ns_notification.userInfo =
+        [NSDictionary dictionaryWithObject:base::SysUTF8ToNSString(
+            notification.notification_id())
+                                    forKey:kNotificationIDKey];
+    ns_notification.hasActionButton = NO;
+
+    notification_map_.insert(
+        std::make_pair(notification.notification_id(),
+            new ControllerNotification(ns_notification,
+                                       new Notification(notification))));
+
+    [GetNotificationCenter() deliverNotification:ns_notification];
+  }
+}
+
+bool NotificationUIManagerMac::CancelById(const std::string& notification_id) {
+  NotificationMap::iterator it = notification_map_.find(notification_id);
+  if (it == notification_map_.end())
+    return builtin_manager_->CancelById(notification_id);
+
+  return RemoveNotification(it->second->view);
+}
+
+bool NotificationUIManagerMac::CancelAllBySourceOrigin(
+    const GURL& source_origin) {
+  bool success = builtin_manager_->CancelAllBySourceOrigin(source_origin);
+
+  for (NotificationMap::iterator it = notification_map_.begin();
+       it != notification_map_.end();) {
+    if (it->second->model->origin_url() == source_origin) {
+      // RemoveNotification will erase from the map, invalidating iterator
+      // references to the removed element.
+      success |= RemoveNotification((it++)->second->view);
+    } else {
+      ++it;
+    }
+  }
+
+  return success;
+}
+
+void NotificationUIManagerMac::CancelAll() {
+  id<CrUserNotificationCenter> center = GetNotificationCenter();
+
+  // Calling RemoveNotification would loop many times over, so just replicate
+  // a small bit of its logic here.
+  for (NotificationMap::iterator it = notification_map_.begin();
+       it != notification_map_.end();
+       ++it) {
+    it->second->model->Close(false);
+    delete it->second;
+  }
+  notification_map_.clear();
+
+  // Clean up any lingering ones in the system tray.
+  [center removeAllDeliveredNotifications];
+
+  builtin_manager_->CancelAll();
+}
+
+BalloonCollection* NotificationUIManagerMac::balloon_collection() {
+  return builtin_manager_->balloon_collection();
+}
+
+NotificationPrefsManager* NotificationUIManagerMac::prefs_manager() {
+  return builtin_manager_.get();
+}
+
+void NotificationUIManagerMac::GetQueuedNotificationsForTesting(
+    std::vector<const Notification*>* notifications) {
+  return builtin_manager_->GetQueuedNotificationsForTesting(notifications);
+}
+
+const Notification*
+NotificationUIManagerMac::FindNotificationWithCocoaNotification(
+    id<CrUserNotification> notification) const {
+  std::string notification_id = base::SysNSStringToUTF8(
+      [notification.userInfo objectForKey:kNotificationIDKey]);
+
+  NotificationMap::const_iterator it = notification_map_.find(notification_id);
+  if (it == notification_map_.end())
+    return NULL;
+
+  return it->second->model;
+}
+
+bool NotificationUIManagerMac::RemoveNotification(
+    id<CrUserNotification> notification) {
+  std::string notification_id = base::SysNSStringToUTF8(
+      [notification.userInfo objectForKey:kNotificationIDKey]);
+  id<CrUserNotificationCenter> center = GetNotificationCenter();
+
+  // First remove all Cocoa notifications from the center that match the
+  // notification. Notifications in the system tray do not share pointer
+  // equality with the balloons or any other message delievered to the
+  // delegate, so this loop must be run through every time to clean up stale
+  // notifications.
+  NSArray* delivered_notifications = center.deliveredNotifications;
+  for (id<CrUserNotification> delivered in delivered_notifications) {
+    if ([delivered isEqual:notification]) {
+      [center removeDeliveredNotification:delivered];
+    }
+  }
+
+  // Then clean up the C++ model side.
+  NotificationMap::iterator it = notification_map_.find(notification_id);
+  if (it == notification_map_.end())
+    return false;
+
+  it->second->model->Close(false);
+  delete it->second;
+  notification_map_.erase(it);
+
+  return true;
+}
+
+id<CrUserNotification>
+NotificationUIManagerMac::FindNotificationWithReplacementId(
+    const string16& replacement_id) const {
+  for (NotificationMap::const_iterator it = notification_map_.begin();
+       it != notification_map_.end();
+       ++it) {
+    if (it->second->model->replace_id() == replacement_id)
+      return it->second->view;
+  }
+  return nil;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+@implementation NotificationCenterDelegate
+
+- (id)initWithManager:(NotificationUIManagerMac*)manager {
+  if ((self = [super init])) {
+    CHECK(manager);
+    manager_ = manager;
+  }
+  return self;
+}
+
+- (void)userNotificationCenter:(NSUserNotificationCenter*)center
+        didDeliverNotification:(id<CrUserNotification>)nsNotification {
+  const Notification* notification =
+      manager_->FindNotificationWithCocoaNotification(nsNotification);
+  if (notification)
+    notification->Display();
+}
+
+- (void)userNotificationCenter:(NSUserNotificationCenter*)center
+       didActivateNotification:(id<CrUserNotification>)nsNotification {
+  const Notification* notification =
+      manager_->FindNotificationWithCocoaNotification(nsNotification);
+  if (notification)
+    notification->Click();
+}
+
+- (BOOL)userNotificationCenter:(NSUserNotificationCenter*)center
+     shouldPresentNotification:(id<CrUserNotification>)nsNotification {
+  // Always display notifications, regardless of whether the app is foreground.
+  return YES;
+}
+
+@end