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      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 #include "ash/wm/user_activity_detector.h"
      6 
      7 #include "ash/wm/user_activity_observer.h"
      8 #include "base/format_macros.h"
      9 #include "base/logging.h"
     10 #include "base/strings/stringprintf.h"
     11 #include "ui/events/event.h"
     12 
     13 namespace ash {
     14 
     15 namespace {
     16 
     17 // Returns a string describing |event|.
     18 std::string GetEventDebugString(const ui::Event* event) {
     19   std::string details = base::StringPrintf(
     20       "type=%d name=%s flags=%d time=%" PRId64,
     21       event->type(), event->name().c_str(), event->flags(),
     22       event->time_stamp().InMilliseconds());
     23 
     24   if (event->IsKeyEvent()) {
     25     details += base::StringPrintf(" key_code=%d",
     26         static_cast<const ui::KeyEvent*>(event)->key_code());
     27   } else if (event->IsMouseEvent() || event->IsTouchEvent() ||
     28              event->IsGestureEvent()) {
     29     details += base::StringPrintf(" location=%s",
     30         static_cast<const ui::LocatedEvent*>(
     31             event)->location().ToString().c_str());
     32   }
     33 
     34   return details;
     35 }
     36 
     37 }  // namespace
     38 
     39 const int UserActivityDetector::kNotifyIntervalMs = 200;
     40 
     41 // Too low and mouse events generated at the tail end of reconfiguration
     42 // will be reported as user activity and turn the screen back on; too high
     43 // and we'll ignore legitimate activity.
     44 const int UserActivityDetector::kDisplayPowerChangeIgnoreMouseMs = 1000;
     45 
     46 UserActivityDetector::UserActivityDetector() {
     47 }
     48 
     49 UserActivityDetector::~UserActivityDetector() {
     50 }
     51 
     52 bool UserActivityDetector::HasObserver(UserActivityObserver* observer) const {
     53   return observers_.HasObserver(observer);
     54 }
     55 
     56 void UserActivityDetector::AddObserver(UserActivityObserver* observer) {
     57   observers_.AddObserver(observer);
     58 }
     59 
     60 void UserActivityDetector::RemoveObserver(UserActivityObserver* observer) {
     61   observers_.RemoveObserver(observer);
     62 }
     63 
     64 void UserActivityDetector::OnDisplayPowerChanging() {
     65   honor_mouse_events_time_ = GetCurrentTime() +
     66       base::TimeDelta::FromMilliseconds(kDisplayPowerChangeIgnoreMouseMs);
     67 }
     68 
     69 void UserActivityDetector::OnKeyEvent(ui::KeyEvent* event) {
     70   HandleActivity(event);
     71 }
     72 
     73 void UserActivityDetector::OnMouseEvent(ui::MouseEvent* event) {
     74   if (event->flags() & ui::EF_IS_SYNTHESIZED)
     75     return;
     76   if (!honor_mouse_events_time_.is_null() &&
     77       GetCurrentTime() < honor_mouse_events_time_)
     78     return;
     79 
     80   HandleActivity(event);
     81 }
     82 
     83 void UserActivityDetector::OnScrollEvent(ui::ScrollEvent* event) {
     84   HandleActivity(event);
     85 }
     86 
     87 void UserActivityDetector::OnTouchEvent(ui::TouchEvent* event) {
     88   HandleActivity(event);
     89 }
     90 
     91 void UserActivityDetector::OnGestureEvent(ui::GestureEvent* event) {
     92   HandleActivity(event);
     93 }
     94 
     95 base::TimeTicks UserActivityDetector::GetCurrentTime() const {
     96   return !now_for_test_.is_null() ? now_for_test_ : base::TimeTicks::Now();
     97 }
     98 
     99 void UserActivityDetector::HandleActivity(const ui::Event* event) {
    100   base::TimeTicks now = GetCurrentTime();
    101   last_activity_time_ = now;
    102   if (last_observer_notification_time_.is_null() ||
    103       (now - last_observer_notification_time_).InMillisecondsF() >=
    104       kNotifyIntervalMs) {
    105     if (VLOG_IS_ON(1))
    106       VLOG(1) << "Reporting user activity: " << GetEventDebugString(event);
    107     FOR_EACH_OBSERVER(UserActivityObserver, observers_, OnUserActivity(event));
    108     last_observer_notification_time_ = now;
    109   }
    110 }
    111 
    112 }  // namespace ash
    113