ash/system/chromeos/network/tray_network_state_observer.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef ASH_SYSTEM_CHROMEOS_NETWORK_TRAY_NETWORK_STATE_OBSERVER_H
   6 #define ASH_SYSTEM_CHROMEOS_NETWORK_TRAY_NETWORK_STATE_OBSERVER_H
   7
   8 #include <string>
   9
  10 #include "base/compiler_specific.h"
  11 #include "base/timer/timer.h"
  12 #include "chromeos/network/network_state_handler_observer.h"
  13
  14 namespace ash {
  15
  16 class TrayNetworkStateObserver : public chromeos::NetworkStateHandlerObserver {
  17  public:
  18   class Delegate {
  19    public:
  20     // Called when any interesting network changes occur. The frequency of this
  21     // event is limited to kUpdateFrequencyMs.
  22     virtual void NetworkStateChanged() = 0;
  23
  24    protected:
  25     virtual ~Delegate() {}
  26   };
  27
  28   explicit TrayNetworkStateObserver(Delegate* delegate);
  29
  30   ~TrayNetworkStateObserver() override;
  31
  32   // NetworkStateHandlerObserver overrides.
  33   void NetworkListChanged() override;
  34   void DeviceListChanged() override;
  35   void DefaultNetworkChanged(const chromeos::NetworkState* network) override;
  36   void NetworkConnectionStateChanged(
  37       const chromeos::NetworkState* network) override;
  38   void NetworkPropertiesUpdated(const chromeos::NetworkState* network) override;
  39
  40  private:
  41   void SignalUpdate();
  42   void SendNetworkStateChanged();
  43
  44   // Unowned Delegate pointer (must outlive this instance).
  45   Delegate* delegate_;
  46
  47   // Set to true when we should purge stale icons in the cache.
  48   bool purge_icons_;
  49
  50   // Frequency at which to push NetworkStateChanged updates. This avoids
  51   // unnecessarily frequent UI updates (which can be expensive). We set this
  52   // to 0 for tests to eliminate timing variance.
  53   int update_frequency_;
  54
  55   // Timer used to limit the frequency of NetworkStateChanged updates.
  56   base::OneShotTimer<TrayNetworkStateObserver> timer_;
  57
  58   DISALLOW_COPY_AND_ASSIGN(TrayNetworkStateObserver);
  59 };
  60
  61 }  // namespace ash
  62
  63 #endif  // ASH_SYSTEM_CHROMEOS_NETWORK_TRAY_NETWORK_STATE_OBSERVER_H