1 files changed, 225 insertions, 0 deletions
diff --git a/widget/nsIdleService.h b/widget/nsIdleService.h
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+++ b/widget/nsIdleService.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:expandtab:shiftwidth=2:tabstop=2:
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsIdleService_h__
+#define nsIdleService_h__
+
+#include "nsIIdleServiceInternal.h"
+#include "nsCOMPtr.h"
+#include "nsITimer.h"
+#include "nsTArray.h"
+#include "nsIObserver.h"
+#include "nsIIdleService.h"
+#include "nsCategoryCache.h"
+#include "nsWeakReference.h"
+#include "mozilla/TimeStamp.h"
+
+/**
+ * Class we can use to store an observer with its associated idle time
+ * requirement and whether or not the observer thinks it's "idle".
+ */
+class IdleListener {
+public:
+  nsCOMPtr<nsIObserver> observer;
+  uint32_t reqIdleTime;
+  bool isIdle;
+
+  IdleListener(nsIObserver* obs, uint32_t reqIT, bool aIsIdle = false) :
+    observer(obs), reqIdleTime(reqIT), isIdle(aIsIdle) {}
+  ~IdleListener() {}
+};
+
+// This one will be declared later.
+class nsIdleService;
+
+/**
+ * Class to handle the daily idle timer.
+ */
+class nsIdleServiceDaily : public nsIObserver,
+                           public nsSupportsWeakReference
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIOBSERVER
+
+  explicit nsIdleServiceDaily(nsIIdleService* aIdleService);
+
+  /**
+   * Initializes the daily idle observer.
+   * Keep this separated from the constructor, since it could cause pointer
+   * corruption due to AddRef/Release of "this".
+   */
+  void Init();
+
+private:
+  virtual ~nsIdleServiceDaily();
+
+  /**
+   * StageIdleDaily is the interim call made when an idle-daily event is due.
+   * However we don't want to fire idle-daily until the user is idle for this
+   * session, so this sets up a short wait for an idle event which triggers
+   * the actual idle-daily event.
+   *
+   * @param aHasBeenLongWait Pass true indicating nsIdleServiceDaily is having
+   * trouble getting the idle-daily event fired. If true StageIdleDaily will
+   * use a shorter idle wait time before firing idle-daily.
+   */
+  void StageIdleDaily(bool aHasBeenLongWait);
+
+  /**
+   * @note This is a normal pointer, part to avoid creating a cycle with the
+   * idle service, part to avoid potential pointer corruption due to this class
+   * being instantiated in the constructor of the service itself.
+   */
+  nsIIdleService* mIdleService;
+
+  /**
+   * Place to hold the timer used by this class to determine when a day has
+   * passed, after that it will wait for idle time to be detected.
+   */
+  nsCOMPtr<nsITimer> mTimer;
+
+  /**
+   * Function that is called back once a day.
+   */
+  static void DailyCallback(nsITimer* aTimer, void* aClosure);
+
+  /**
+   * Cache of observers for the "idle-daily" category.
+   */
+  nsCategoryCache<nsIObserver> mCategoryObservers;
+
+  /**
+   * Boolean set to true when daily idle notifications should be disabled.
+   */
+  bool mShutdownInProgress;
+
+  /**
+   * Next time we expect an idle-daily timer to fire, in case timers aren't
+   * very reliable on the platform. Value is in PR_Now microsecond units.
+   */
+  PRTime mExpectedTriggerTime;
+
+  /**
+   * Tracks which idle daily observer callback we ask for. There are two: a
+   * regular long idle wait and a shorter wait if we've been waiting to fire
+   * idle daily for an extended period. Set by StageIdleDaily.
+   */
+  int32_t mIdleDailyTriggerWait;
+};
+
+class nsIdleService : public nsIIdleServiceInternal
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIIDLESERVICE
+  NS_DECL_NSIIDLESERVICEINTERNAL
+
+protected:
+  static already_AddRefed<nsIdleService> GetInstance();
+
+  nsIdleService();
+  virtual ~nsIdleService();
+
+  /**
+   * If there is a platform specific function to poll the system idel time
+   * then that must be returned in this function, and the function MUST return
+   * true, otherwise then the function should be left unimplemented or made
+   * to return false (this can also be used for systems where it depends on
+   * the configuration of the system if the idle time can be determined)
+   *
+   * @param aIdleTime
+   *        The idle time in ms.
+   *
+   * @return true if the idle time could be polled, false otherwise.
+   *
+   * @note The time returned by this function can be different than the one
+   *       returned by GetIdleTime, as that is corrected by any calls to
+   *       ResetIdleTimeOut(), unless you overwrite that function too...
+   */
+  virtual bool PollIdleTime(uint32_t* aIdleTime);
+
+  /**
+   * Function that determines if we are in poll mode or not.
+   *
+   * @return true if polling is supported, false otherwise.
+   */
+  virtual bool UsePollMode();
+
+private:
+  /**
+   * Ensure that the timer is expiring at least at the given time
+   *
+   * The function might not restart the timer if there is one running currently
+   *
+   * @param aNextTimeout
+   *        The last absolute time the timer should expire
+   */
+  void SetTimerExpiryIfBefore(mozilla::TimeStamp aNextTimeout);
+
+  /**
+   * Stores the next timeout time, 0 means timer not running
+   */
+  mozilla::TimeStamp mCurrentlySetToTimeoutAt;
+
+  /**
+   * mTimer holds the internal timer used by this class to detect when to poll
+   * for idle time, when to check if idle timers should expire etc.
+   */
+  nsCOMPtr<nsITimer> mTimer;
+
+  /**
+   * Array of listeners that wants to be notified about idle time.
+   */
+  nsTArray<IdleListener> mArrayListeners;
+
+  /**
+   * Object keeping track of the daily idle thingy.
+   */
+  RefPtr<nsIdleServiceDaily> mDailyIdle;
+
+  /**
+   * Number of observers currently in idle mode.
+   */
+  uint32_t mIdleObserverCount;
+
+  /**
+   * Delta time from last non idle time to when the next observer should switch
+   * to idle mode
+   *
+   * Time in seconds
+   *
+   * If this value is 0 it means there are no active observers
+   */
+  uint32_t mDeltaToNextIdleSwitchInS;
+
+  /**
+   * Absolute value for when the last user interaction took place.
+   */
+  mozilla::TimeStamp mLastUserInteraction;
+
+
+  /**
+   * Function that ensures the timer is running with at least the minimum time
+   * needed.  It will kill the timer if there are no active observers.
+   */
+  void ReconfigureTimer(void);
+
+  /**
+   * Callback function that is called when the internal timer expires.
+   *
+   * This in turn calls the IdleTimerCallback that does the real processing
+   */
+  static void StaticIdleTimerCallback(nsITimer* aTimer, void* aClosure);
+
+  /**
+   * Function that handles when a timer has expired
+   */
+  void IdleTimerCallback(void);
+};
+
+#endif // nsIdleService_h__