Auto open and close the palette on an eject event.

chrome/browser/ui/ash/palette_delegate_chromeos.cc

 // Copyright 2016 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 "chrome/browser/ui/ash/palette_delegate_chromeos.h"
 
 #include "ash/accelerators/accelerator_controller_delegate_aura.h"
 #include "ash/magnifier/partial_magnification_controller.h"
 #include "ash/screenshot_delegate.h"
 #include "ash/shell.h"
 #include "ash/utility/screenshot_controller.h"
 #include "chrome/browser/chromeos/note_taking_app_utils.h"
 #include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/common/pref_names.h"
+#include "components/prefs/pref_service.h"
+#include "ui/events/devices/input_device_manager.h"
 
 namespace chromeos {
 namespace {
 
 Profile* GetProfile() {
   return ProfileManager::GetActiveUserProfile();
 }
 
 }  // namespace
 
-PaletteDelegateChromeOS::PaletteDelegateChromeOS() {}
+PaletteDelegateChromeOS::PaletteDelegateChromeOS() {
+  ui::InputDeviceManager::GetInstance()->AddObserver(this);
+}
 
-PaletteDelegateChromeOS::~PaletteDelegateChromeOS() {}
+PaletteDelegateChromeOS::~PaletteDelegateChromeOS() {
+  ui::InputDeviceManager::GetInstance()->RemoveObserver(this);
+}
 
 void PaletteDelegateChromeOS::CreateNote() {
   chromeos::LaunchNoteTakingAppForNewNote(GetProfile(), base::FilePath());
 }
 
 bool PaletteDelegateChromeOS::HasNoteApp() {
   return chromeos::IsNoteTakingAppAvailable(GetProfile());
 }
 
 void PaletteDelegateChromeOS::SetPartialMagnifierState(bool enabled) {
   ash::PartialMagnificationController* controller =
       ash::Shell::GetInstance()->partial_magnification_controller();
   controller->SetEnabled(enabled);
 }
 
+void PaletteDelegateChromeOS::SetStylusStateChangedCallback(
+    const OnStylusStateChangedCallback& on_stylus_state_changed) {
+  on_stylus_state_changed_ = on_stylus_state_changed;
+}
+
+bool PaletteDelegateChromeOS::ShouldAutoOpenPalette() {
+  return GetProfile()->GetPrefs()->GetBoolean(
+      prefs::kLaunchPaletteOnEjectEvent);
+}
+
 void PaletteDelegateChromeOS::TakeScreenshot() {
   auto* screenshot_delegate = ash::Shell::GetInstance()
                                   ->accelerator_controller_delegate()
                                   ->screenshot_delegate();
   screenshot_delegate->HandleTakeScreenshotForAllRootWindows();
 }
 
 void PaletteDelegateChromeOS::TakePartialScreenshot() {
   auto* screenshot_controller =
       ash::Shell::GetInstance()->screenshot_controller();
   auto* screenshot_delegate = ash::Shell::GetInstance()
                                   ->accelerator_controller_delegate()
                                   ->screenshot_delegate();
 
   screenshot_controller->set_pen_events_only(true);
   screenshot_controller->StartPartialScreenshotSession(
       screenshot_delegate, false /* draw_overlay_immediately */);
 }
 
+void PaletteDelegateChromeOS::OnStylusStateChanged(ui::StylusState state) {
+  on_stylus_state_changed_.Run(state);
+}
+
 }  // namespace chromeos