Intorduce PowerButtonObserver API

athena/system/power_button_controller.cc

Index: athena/system/power_button_controller.cc
diff --git a/athena/system/power_button_controller.cc b/athena/system/power_button_controller.cc
deleted file mode 100644
index e1105b90e9ad458f4816dfc5d525aa5e4247813d..0000000000000000000000000000000000000000
--- a/athena/system/power_button_controller.cc
+++ /dev/null
@@ -1,126 +0,0 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "athena/system/power_button_controller.h"
-
-#include "athena/screen/public/screen_manager.h"
-#include "athena/strings/grit/athena_strings.h"
-#include "chromeos/dbus/dbus_thread_manager.h"
-#include "ui/base/l10n/l10n_util.h"
-#include "ui/gfx/font_list.h"
-#include "ui/views/background.h"
-#include "ui/views/border.h"
-#include "ui/views/controls/label.h"
-#include "ui/views/layout/box_layout.h"
-#include "ui/views/widget/widget.h"
-
-namespace athena {
-namespace {
-
-// The amount of time that the power button must be held to show the shutdown
-// warning dialog.
-const int kShowShutdownWarningTimeoutMs = 1000;
-
-// The amount of time that the power button must be held to shut down the
-// device.
-const int kShutdownTimeoutMs = 5000;
-
-}  // namespace
-
-PowerButtonController::PowerButtonController(aura::Window* dialog_container)
-    : warning_message_container_(dialog_container),
-      brightness_is_zero_(false),
-      state_(STATE_OTHER) {
-  chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->AddObserver(
-      this);
-}
-
-PowerButtonController::~PowerButtonController() {
-  chromeos::DBusThreadManager::Get()->GetPowerManagerClient()->RemoveObserver(
-      this);
-}
-
-void PowerButtonController::ShowShutdownWarningDialog() {
-  state_ = STATE_SHUTDOWN_WARNING_VISIBLE;
-
-  shutdown_warning_message_.reset(new views::Widget);
-
-  views::Widget::InitParams params(views::Widget::InitParams::TYPE_POPUP);
-  params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
-  params.parent = warning_message_container_;
-  shutdown_warning_message_->Init(params);
-
-  views::Label* label =
-      new views::Label(l10n_util::GetStringUTF16(IDS_ATHENA_SHUTDOWN_WARNING));
-  label->SetBackgroundColor(SK_ColorWHITE);
-  label->SetFontList(gfx::FontList().DeriveWithStyle(gfx::Font::BOLD));
-
-  views::View* container = new views::View;
-  container->AddChildView(label);
-
-  const int kBorderSpacing = 50;
-  container->SetLayoutManager(new views::BoxLayout(
-      views::BoxLayout::kHorizontal, kBorderSpacing, kBorderSpacing, 0));
-  container->set_background(
-      views::Background::CreateSolidBackground(SK_ColorWHITE));
-  container->SetBorder(views::Border::CreateSolidBorder(1, SK_ColorBLACK));
-
-  shutdown_warning_message_->SetContentsView(container);
-  shutdown_warning_message_->CenterWindow(container->GetPreferredSize());
-  shutdown_warning_message_->Show();
-
-  timer_.Start(FROM_HERE,
-               base::TimeDelta::FromMilliseconds(kShutdownTimeoutMs -
-                                                 kShowShutdownWarningTimeoutMs),
-               this,
-               &PowerButtonController::Shutdown);
-}
-
-void PowerButtonController::Shutdown() {
-  state_ = STATE_SHUTDOWN_REQUESTED;
-  chromeos::DBusThreadManager::Get()
-      ->GetPowerManagerClient()
-      ->RequestShutdown();
-}
-
-void PowerButtonController::BrightnessChanged(int level, bool user_initiated) {
-  if (brightness_is_zero_)
-    zero_brightness_end_time_ = base::TimeTicks::Now();
-  brightness_is_zero_ = (level == 0);
-}
-
-void PowerButtonController::PowerButtonEventReceived(
-    bool down,
-    const base::TimeTicks& timestamp) {
-  if (state_ == STATE_SHUTDOWN_REQUESTED)
-    return;
-
-  // Avoid requesting suspend or shutdown if the power button is pressed while
-  // the screen is off (http://crbug.com/128451).
-  base::TimeDelta time_since_zero_brightness = brightness_is_zero_ ?
-      base::TimeDelta() : (base::TimeTicks::Now() - zero_brightness_end_time_);
-  const int kShortTimeMs = 10;
-  if (time_since_zero_brightness.InMilliseconds() <= kShortTimeMs)
-    return;
-
-  if (down) {
-    state_ = STATE_SUSPEND_ON_RELEASE;
-    timer_.Start(
-        FROM_HERE,
-        base::TimeDelta::FromMilliseconds(kShowShutdownWarningTimeoutMs),
-        this,
-        &PowerButtonController::ShowShutdownWarningDialog);
-  } else {
-    if (state_ == STATE_SUSPEND_ON_RELEASE) {
-      chromeos::DBusThreadManager::Get()
-          ->GetPowerManagerClient()
-          ->RequestSuspend();
-    }
-    state_ = STATE_OTHER;
-    timer_.Stop();
-    shutdown_warning_message_.reset();
-  }
-}
-
-}  // namespace athena