[Athena] Make a quick power button tap suspend the device

athena/system/power_button_controller.cc

 // 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 "base/strings/utf_string_conversions.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
-#include "ui/compositor/layer_animator.h"
-#include "ui/compositor/scoped_layer_animation_settings.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 {
 
-// Duration of the shutdown animation.
-const int kShutdownDurationMs = 1000;
+// The amount of time that the power button must be pressed to show the shutdown
+// warning dialog.
+const int kShowShutdownWarningTimeoutMs = 1000;
 
-// Duration of the cancel shutdown animation.
-const int kCancelShutdownDurationMs = 500;
+// The amount of time that the power button must be pressed to shut down the
+// device.
+const int kShutdownTimeoutMs = 5000;
 
 }  // namespace
 
-PowerButtonController::PowerButtonController()
-    : brightness_is_zero_(false),
+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::StartGrayscaleAndBrightnessAnimation(
-    float target,
-    int duration_ms,
-    gfx::Tween::Type tween_type) {
-  ui::LayerAnimator* animator = ScreenManager::Get()->GetScreenAnimator();
-  ui::ScopedLayerAnimationSettings settings(animator);
-  settings.SetTransitionDuration(
-      base::TimeDelta::FromMilliseconds(duration_ms));
-  settings.SetTweenType(tween_type);
-  settings.SetPreemptionStrategy(
-      ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
-  settings.AddObserver(this);
+void PowerButtonController::ShowShutdownWarningDialog() {

[flackr, 2014/09/19 14:45:29]

I think when this shows we should no longer suspend, since when I see this
dialog my impression is that if I stop holding it will cancel the shutdown.

+  shutdown_warning_message_.reset(new views::Widget);
 
-  animator->SetBrightness(target);
-  animator->SetGrayscale(target);
+  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(
+      base::UTF8ToUTF16("Keep pressing power button to shutdown."));

[flackr, 2014/09/19 14:45:29]

nit s/pressing/holding

+  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) {
-  // Avoid requesting a shutdown if the power button is pressed while the screen
-  // is off (http://crbug.com/128451)
+  // 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 (state_ == STATE_SHUTDOWN_REQUESTED)
     return;
 
-  StopObservingImplicitAnimations();
   if (down) {
-    state_ = STATE_PRE_SHUTDOWN_ANIMATION;
-    StartGrayscaleAndBrightnessAnimation(
-        1.0f, kShutdownDurationMs, gfx::Tween::EASE_IN);
+    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;
-    StartGrayscaleAndBrightnessAnimation(
-        0.0f, kCancelShutdownDurationMs, gfx::Tween::EASE_IN_OUT);
+    timer_.Stop();
+    shutdown_warning_message_.reset();
   }
 }
 
-void PowerButtonController::OnImplicitAnimationsCompleted() {
-  if (state_ == STATE_PRE_SHUTDOWN_ANIMATION) {
-    state_ = STATE_SHUTDOWN_REQUESTED;
-    chromeos::DBusThreadManager::Get()
-        ->GetPowerManagerClient()
-        ->RequestShutdown();
-  }
-}
-
 }  // namespace athena