Revert of 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
new file mode 100644
index 0000000000000000000000000000000000000000..e1105b90e9ad458f4816dfc5d525aa5e4247813d
--- /dev/null
+++ b/athena/system/power_button_controller.cc
@@ -0,0 +1,126 @@
+// 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