mash: Migrate ShelfLockingManager to ash/common.

ash/shelf/shelf_locking_manager.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 "ash/shelf/shelf_locking_manager.h"
-
-#include "ash/common/session/session_state_delegate.h"
-#include "ash/common/wm_shell.h"
-#include "ash/shelf/shelf.h"
-#include "ash/shell.h"
-#include "ash/wm/lock_state_controller.h"
-
-namespace ash {
-
-ShelfLockingManager::ShelfLockingManager(Shelf* shelf) : shelf_(shelf) {
-  Shell* shell = Shell::GetInstance();
-  shell->lock_state_controller()->AddObserver(this);
-  SessionStateDelegate* delegate = WmShell::Get()->GetSessionStateDelegate();
-  session_locked_ =
-      delegate->GetSessionState() != SessionStateDelegate::SESSION_STATE_ACTIVE;
-  screen_locked_ = delegate->IsScreenLocked();
-  delegate->AddSessionStateObserver(this);
-  WmShell::Get()->AddShellObserver(this);
-}
-
-ShelfLockingManager::~ShelfLockingManager() {
-  Shell::GetInstance()->lock_state_controller()->RemoveObserver(this);
-  WmShell::Get()->GetSessionStateDelegate()->RemoveSessionStateObserver(this);
-  WmShell::Get()->RemoveShellObserver(this);
-}
-
-void ShelfLockingManager::OnLockStateChanged(bool locked) {
-  screen_locked_ = locked;
-  UpdateLockedState();
-}
-
-void ShelfLockingManager::SessionStateChanged(
-    SessionStateDelegate::SessionState state) {
-  session_locked_ = state != SessionStateDelegate::SESSION_STATE_ACTIVE;
-  UpdateLockedState();
-}
-
-void ShelfLockingManager::OnLockStateEvent(EventType event) {
-  // Lock when the animation starts, ignoring pre-lock. There's no unlock event.
-  screen_locked_ |= event == EVENT_LOCK_ANIMATION_STARTED;
-  UpdateLockedState();
-}
-
-void ShelfLockingManager::UpdateLockedState() {
-  const ShelfAlignment alignment = shelf_->alignment();
-  if (is_locked() && alignment != SHELF_ALIGNMENT_BOTTOM_LOCKED) {
-    stored_alignment_ = alignment;
-    shelf_->SetAlignment(SHELF_ALIGNMENT_BOTTOM_LOCKED);
-  } else if (!is_locked() && alignment == SHELF_ALIGNMENT_BOTTOM_LOCKED) {
-    shelf_->SetAlignment(stored_alignment_);
-  }
-}
-
-}  // namespace ash