Do not show notifications when in fullscreen or screensaver mode.

I add full-screen/presentation mode detection for all 3 platforms. I also
add screensaver detection for MacOSX and Linux since it is missing in these
2 platforms.

BUG=25061
TEST=Manual test

Review URL: http://codereview.chromium.org/6359008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72539 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 45 insertions, 3 deletions

diff --git a/chrome/browser/notifications/notification_ui_manager.cc b/chrome/browser/notifications/notification_ui_manager.cc
index 950bd6c..51a2c66 100644
--- a/chrome/browser/notifications/notification_ui_manager.cc
+++ b/chrome/browser/notifications/notification_ui_manager.cc
@@ -8,6 +8,8 @@
 #include "base/scoped_ptr.h"
 #include "base/stl_util-inl.h"
 #include "chrome/browser/browser_process.h"
+#include "chrome/browser/fullscreen.h"
+#include "chrome/browser/idle.h"
 #include "chrome/browser/notifications/balloon_collection.h"
 #include "chrome/browser/notifications/notification.h"
 #include "chrome/browser/prefs/pref_service.h"
@@ -16,6 +18,10 @@
 #include "chrome/common/notification_type.h"
 #include "chrome/common/pref_names.h"
 
+namespace {
+const int kUserStatePollingIntervalSeconds = 1;
+}
+
 // A class which represents a notification waiting to be shown.
 class QueuedNotification {
  public:
@@ -42,14 +48,21 @@ class QueuedNotification {
 };
 
 NotificationUIManager::NotificationUIManager(PrefService* local_state)
-    : balloon_collection_(NULL) {
+    : balloon_collection_(NULL),
+      is_user_active_(true) {
   registrar_.Add(this, NotificationType::APP_TERMINATING,
                  NotificationService::AllSources());
   position_pref_.Init(prefs::kDesktopNotificationPosition, local_state, this);
+#if defined(OS_MACOSX)
+  InitFullScreenMonitor();
+#endif
 }
 
 NotificationUIManager::~NotificationUIManager() {
   STLDeleteElements(&show_queue_);
+#if defined(OS_MACOSX)
+  StopFullScreenMonitor();
+#endif
 }
 
 // static
@@ -126,8 +139,29 @@ void NotificationUIManager::CancelAll() {
 }
 
 void NotificationUIManager::CheckAndShowNotifications() {
-  // TODO(johnnyg): http://crbug.com/25061 - Check for user idle/presentation.
-  ShowNotifications();
+  CheckUserState();
+  if (is_user_active_)
+    ShowNotifications();
+}
+
+void NotificationUIManager::CheckUserState() {
+  bool is_user_active_previously = is_user_active_;
+  is_user_active_ = CalculateIdleState(0) != IDLE_STATE_LOCKED &&
+                    !IsFullScreenMode();
+  if (is_user_active_ == is_user_active_previously)
+    return;
+
+  if (is_user_active_) {
+    user_state_check_timer_.Stop();
+    // We need to show any postponed nofications when the user becomes active
+    // again.
+    ShowNotifications();
+  } else if (!user_state_check_timer_.IsRunning()) {
+    // Start a timer to detect the moment at which the user becomes active.
+    user_state_check_timer_.Start(
+        base::TimeDelta::FromSeconds(kUserStatePollingIntervalSeconds), this,
+        &NotificationUIManager::CheckUserState);
+  }
 }
 
 void NotificationUIManager::ShowNotifications() {
diff --git a/chrome/browser/notifications/notification_ui_manager.h b/chrome/browser/notifications/notification_ui_manager.h
index 1b9475d..7ac63a2 100644
--- a/chrome/browser/notifications/notification_ui_manager.h
+++ b/chrome/browser/notifications/notification_ui_manager.h
@@ -11,6 +11,7 @@
 
 #include "base/id_map.h"
 #include "base/scoped_ptr.h"
+#include "base/timer.h"
 #include "chrome/browser/notifications/balloon.h"
 #include "chrome/browser/notifications/balloon_collection.h"
 #include "chrome/browser/prefs/pref_member.h"
@@ -93,6 +94,9 @@ class NotificationUIManager
   // returns true if the replacement happened.
   bool TryReplacement(const Notification& notification);
 
+  // Checks the user state to decide if we want to show the notification.
+  void CheckUserState();
+
   // An owned pointer to the collection of active balloons.
   scoped_ptr<BalloonCollection> balloon_collection_;
 
@@ -106,6 +110,10 @@ class NotificationUIManager
   // Prefs listener for the position preference.
   IntegerPrefMember position_pref_;
 
+  // Used by screen-saver and full-screen handling support.
+  bool is_user_active_;
+  base::RepeatingTimer<NotificationUIManager> user_state_check_timer_;
+
   DISALLOW_COPY_AND_ASSIGN(NotificationUIManager);
 };