athena/system/power_button_controller.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 "athena/system/power_button_controller.h"
   6
   7 #include "athena/screen/public/screen_manager.h"
   8 #include "chromeos/dbus/dbus_thread_manager.h"
   9 #include "ui/compositor/layer_animator.h"
  10 #include "ui/compositor/scoped_layer_animation_settings.h"
  11
  12 namespace athena {
  13 namespace {
  14
  15 // Duration of the shutdown animation.
  16 const int kShutdownDurationMs = 1000;
  17
  18 // Duration of the cancel shutdown animation.
  19 const int kCancelShutdownDurationMs = 500;
  20
  21 }  // namespace
  22
  23 PowerButtonController::PowerButtonController()
  24     : brightness_is_zero_(false),
  25       state_(STATE_OTHER) {
  26   chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->AddObserver(
  27       this);
  28 }
  29
  30 PowerButtonController::~PowerButtonController() {
  31   chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->RemoveObserver(
  32       this);
  33 }
  34
  35 void PowerButtonController::StartGrayscaleAndBrightnessAnimation(
  36     float target,
  37     int duration_ms,
  38     gfx::Tween::Type tween_type) {
  39   ui::LayerAnimator* animator = ScreenManager::Get()->GetScreenAnimator();
  40   ui::ScopedLayerAnimationSettings settings(animator);
  41   settings.SetTransitionDuration(
  42       base::TimeDelta::FromMilliseconds(duration_ms));
  43   settings.SetTweenType(tween_type);
  44   settings.SetPreemptionStrategy(
  45       ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
  46   settings.AddObserver(this);
  47
  48   animator->SetBrightness(target);
  49   animator->SetGrayscale(target);
  50 }
  51
  52 void PowerButtonController::BrightnessChanged(int level, bool user_initiated) {
  53   if (brightness_is_zero_)
  54     zero_brightness_end_time_ = base::TimeTicks::Now();
  55   brightness_is_zero_ = (level == 0);
  56 }
  57
  58 void PowerButtonController::PowerButtonEventReceived(
  59     bool down,
  60     const base::TimeTicks& timestamp) {
  61   // Avoid requesting a shutdown if the power button is pressed while the screen
  62   // is off (http://crbug.com/128451)
  63   base::TimeDelta time_since_zero_brightness = brightness_is_zero_ ?
  64       base::TimeDelta() : (base::TimeTicks::Now() - zero_brightness_end_time_);
  65   const int kShortTimeMs = 10;
  66   if (time_since_zero_brightness.InMilliseconds() <= kShortTimeMs)
  67     return;
  68
  69   if (state_ == STATE_SHUTDOWN_REQUESTED)
  70     return;
  71
  72   StopObservingImplicitAnimations();
  73   if (down) {
  74     state_ = STATE_PRE_SHUTDOWN_ANIMATION;
  75     StartGrayscaleAndBrightnessAnimation(
  76         1.0f, kShutdownDurationMs, gfx::Tween::EASE_IN);
  77   } else {
  78     state_ = STATE_OTHER;
  79     StartGrayscaleAndBrightnessAnimation(
  80         0.0f, kCancelShutdownDurationMs, gfx::Tween::EASE_IN_OUT);
  81   }
  82 }
  83
  84 void PowerButtonController::OnImplicitAnimationsCompleted() {
  85   if (state_ == STATE_PRE_SHUTDOWN_ANIMATION) {
  86     state_ = STATE_SHUTDOWN_REQUESTED;
  87     chromeos::DBusThreadManager::Get()
  88         ->GetPowerManagerClient()
  89         ->RequestShutdown();
  90   }
  91 }
  92
  93 }  // namespace athena