ash/system/chromeos/session/tray_session_length_limit.cc

   1 // Copyright 2014 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 #include "ash/system/chromeos/session/tray_session_length_limit.h"
   6
   7 #include <algorithm>
   8
   9 #include "ash/shell.h"
  10 #include "ash/system/chromeos/label_tray_view.h"
  11 #include "ash/system/system_notifier.h"
  12 #include "ash/system/tray/system_tray.h"
  13 #include "ash/system/tray/system_tray_delegate.h"
  14 #include "ash/system/tray/system_tray_notifier.h"
  15 #include "base/logging.h"
  16 #include "base/strings/utf_string_conversions.h"
  17 #include "grit/ash_resources.h"
  18 #include "grit/ash_strings.h"
  19 #include "ui/base/l10n/l10n_util.h"
  20 #include "ui/base/l10n/time_format.h"
  21 #include "ui/base/resource/resource_bundle.h"
  22 #include "ui/message_center/message_center.h"
  23 #include "ui/message_center/notification.h"
  24 #include "ui/views/view.h"
  25
  26 namespace ash {
  27 namespace {
  28
  29 // If the remaining session time falls below this threshold, the user should be
  30 // informed that the session is about to expire.
  31 const int kExpiringSoonThresholdInMinutes = 5;
  32
  33 // Use 500ms interval for updates to notification and tray bubble to reduce the
  34 // likelihood of a user-visible skip in high load situations (as might happen
  35 // with 1000ms).
  36 const int kTimerIntervalInMilliseconds = 500;
  37
  38 }  // namespace
  39
  40 // static
  41 const char TraySessionLengthLimit::kNotificationId[] =
  42     "chrome://session/timeout";
  43
  44 TraySessionLengthLimit::TraySessionLengthLimit(SystemTray* system_tray)
  45     : SystemTrayItem(system_tray),
  46       limit_state_(LIMIT_NONE),
  47       last_limit_state_(LIMIT_NONE),
  48       tray_bubble_view_(NULL) {
  49   Shell::GetInstance()->system_tray_notifier()->
  50       AddSessionLengthLimitObserver(this);
  51   Update();
  52 }
  53
  54 TraySessionLengthLimit::~TraySessionLengthLimit() {
  55   Shell::GetInstance()->system_tray_notifier()->
  56       RemoveSessionLengthLimitObserver(this);
  57 }
  58
  59 // Add view to tray bubble.
  60 views::View* TraySessionLengthLimit::CreateDefaultView(
  61     user::LoginStatus status) {
  62   CHECK(!tray_bubble_view_);
  63   UpdateState();
  64   if (limit_state_ == LIMIT_NONE)
  65     return NULL;
  66   tray_bubble_view_ = new LabelTrayView(
  67       NULL /* click_listener */,
  68       IDR_AURA_UBER_TRAY_BUBBLE_SESSION_LENGTH_LIMIT);
  69   tray_bubble_view_->SetMessage(ComposeTrayBubbleMessage());
  70   return tray_bubble_view_;
  71 }
  72
  73 // View has been removed from tray bubble.
  74 void TraySessionLengthLimit::DestroyDefaultView() {
  75   tray_bubble_view_ = NULL;
  76 }
  77
  78 void TraySessionLengthLimit::OnSessionStartTimeChanged() {
  79   Update();
  80 }
  81
  82 void TraySessionLengthLimit::OnSessionLengthLimitChanged() {
  83   Update();
  84 }
  85
  86 void TraySessionLengthLimit::Update() {
  87   UpdateState();
  88   UpdateNotification();
  89   UpdateTrayBubbleView();
  90 }
  91
  92 void TraySessionLengthLimit::UpdateState() {
  93   SystemTrayDelegate* delegate = Shell::GetInstance()->system_tray_delegate();
  94   if (delegate->GetSessionStartTime(&session_start_time_) &&
  95       delegate->GetSessionLengthLimit(&time_limit_)) {
  96     const base::TimeDelta expiring_soon_threshold(
  97         base::TimeDelta::FromMinutes(kExpiringSoonThresholdInMinutes));
  98     remaining_session_time_ = std::max(
  99         time_limit_ - (base::TimeTicks::Now() - session_start_time_),
 100         base::TimeDelta());
 101     limit_state_ = remaining_session_time_ <= expiring_soon_threshold ?
 102         LIMIT_EXPIRING_SOON : LIMIT_SET;
 103     if (!timer_)
 104       timer_.reset(new base::RepeatingTimer<TraySessionLengthLimit>);
 105     if (!timer_->IsRunning()) {
 106       timer_->Start(FROM_HERE,
 107                     base::TimeDelta::FromMilliseconds(
 108                         kTimerIntervalInMilliseconds),
 109                     this,
 110                     &TraySessionLengthLimit::Update);
 111     }
 112   } else {
 113     remaining_session_time_ = base::TimeDelta();
 114     limit_state_ = LIMIT_NONE;
 115     timer_.reset();
 116   }
 117 }
 118
 119 void TraySessionLengthLimit::UpdateNotification() {
 120   message_center::MessageCenter* message_center =
 121       message_center::MessageCenter::Get();
 122
 123   // If state hasn't changed and the notification has already been acknowledged,
 124   // we won't re-create it.
 125   if (limit_state_ == last_limit_state_ &&
 126       !message_center->FindVisibleNotificationById(kNotificationId)) {
 127     return;
 128   }
 129
 130   // After state change, any possibly existing notification is removed to make
 131   // sure it is re-shown even if it had been acknowledged by the user before
 132   // (and in the rare case of state change towards LIMIT_NONE to make the
 133   // notification disappear).
 134   if (limit_state_ != last_limit_state_ &&
 135       message_center->FindVisibleNotificationById(kNotificationId)) {
 136     message_center::MessageCenter::Get()->RemoveNotification(
 137         kNotificationId, false /* by_user */);
 138   }
 139
 140   // For LIMIT_NONE, there's nothing more to do.
 141   if (limit_state_ == LIMIT_NONE) {
 142     last_limit_state_ = limit_state_;
 143     return;
 144   }
 145
 146   ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
 147   message_center::RichNotificationData data;
 148   data.should_make_spoken_feedback_for_popup_updates =
 149       (limit_state_ != last_limit_state_);
 150   scoped_ptr<message_center::Notification> notification(
 151       new message_center::Notification(
 152           message_center::NOTIFICATION_TYPE_SIMPLE, kNotificationId,
 153           base::string16() /* title */,
 154           ComposeNotificationMessage() /* message */,
 155           bundle.GetImageNamed(
 156               IDR_AURA_UBER_TRAY_NOTIFICATION_SESSION_LENGTH_LIMIT),
 157           base::string16() /* display_source */, GURL(),
 158           message_center::NotifierId(
 159               message_center::NotifierId::SYSTEM_COMPONENT,
 160               system_notifier::kNotifierSessionLengthTimeout),
 161           data, NULL /* delegate */));
 162   notification->SetSystemPriority();
 163   if (message_center->FindVisibleNotificationById(kNotificationId))
 164     message_center->UpdateNotification(kNotificationId, notification.Pass());
 165   else
 166     message_center->AddNotification(notification.Pass());
 167   last_limit_state_ = limit_state_;
 168 }
 169
 170 void TraySessionLengthLimit::UpdateTrayBubbleView() const {
 171   if (!tray_bubble_view_)
 172     return;
 173   if (limit_state_ == LIMIT_NONE)
 174     tray_bubble_view_->SetMessage(base::string16());
 175   else
 176     tray_bubble_view_->SetMessage(ComposeTrayBubbleMessage());
 177   tray_bubble_view_->Layout();
 178 }
 179
 180 base::string16 TraySessionLengthLimit::ComposeNotificationMessage() const {
 181   return l10n_util::GetStringFUTF16(
 182       IDS_ASH_STATUS_TRAY_NOTIFICATION_SESSION_LENGTH_LIMIT,
 183       ui::TimeFormat::Detailed(ui::TimeFormat::FORMAT_DURATION,
 184                                ui::TimeFormat::LENGTH_LONG,
 185                                10,
 186                                remaining_session_time_));
 187 }
 188
 189 base::string16 TraySessionLengthLimit::ComposeTrayBubbleMessage() const {
 190   return l10n_util::GetStringFUTF16(
 191       IDS_ASH_STATUS_TRAY_BUBBLE_SESSION_LENGTH_LIMIT,
 192       ui::TimeFormat::Detailed(ui::TimeFormat::FORMAT_DURATION,
 193                                ui::TimeFormat::LENGTH_LONG,
 194                                10,
 195                                remaining_session_time_));
 196 }
 197
 198 }  // namespace ash