Moves ScreenDimmer to ash/common

ash/wm/screen_dimmer.cc

-// Copyright (c) 2012 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/wm/screen_dimmer.h"
-
-#include "ash/common/shell_window_ids.h"
-#include "ash/common/wm/container_finder.h"
-#include "ash/common/wm/window_dimmer.h"
-#include "ash/common/wm_shell.h"
-#include "ash/common/wm_window.h"
-#include "ash/common/wm_window_user_data.h"
-#include "base/memory/ptr_util.h"
-
-namespace ash {
-namespace {
-
-// Opacity when it's dimming the entire screen.
-const float kDimmingLayerOpacityForRoot = 0.4f;
-
-// Opacity for lock screen.
-const float kDimmingLayerOpacityForLockScreen = 0.5f;
-
-}  // namespace
-
-ScreenDimmer::ScreenDimmer(Container container)
-    : container_(container),
-      is_dimming_(false),
-      at_bottom_(false),
-      window_dimmers_(base::MakeUnique<WmWindowUserData<WindowDimmer>>()) {
-  WmShell::Get()->AddShellObserver(this);
-}
-
-ScreenDimmer::~ScreenDimmer() {
-  WmShell::Get()->RemoveShellObserver(this);
-}
-
-void ScreenDimmer::SetDimming(bool should_dim) {
-  if (should_dim == is_dimming_)
-    return;
-  is_dimming_ = should_dim;
-
-  Update(should_dim);
-}
-
-std::vector<WmWindow*> ScreenDimmer::GetAllContainers() {
-  return container_ == Container::ROOT
-             ? WmShell::Get()->GetAllRootWindows()
-             : wm::GetContainersFromAllRootWindows(
-                   ash::kShellWindowId_LockScreenContainersContainer);
-}
-
-void ScreenDimmer::OnRootWindowAdded(WmWindow* root_window) {
-  Update(is_dimming_);
-}
-
-void ScreenDimmer::Update(bool should_dim) {
-  for (WmWindow* container : GetAllContainers()) {
-    WindowDimmer* window_dimmer = window_dimmers_->Get(container);
-    if (should_dim) {
-      if (!window_dimmer) {
-        window_dimmers_->Set(container,
-                             base::MakeUnique<WindowDimmer>(container));
-        window_dimmer = window_dimmers_->Get(container);
-        window_dimmer->SetDimOpacity(container_ == Container::ROOT
-                                         ? kDimmingLayerOpacityForRoot
-                                         : kDimmingLayerOpacityForLockScreen);
-      }
-      if (at_bottom_)
-        container->StackChildAtBottom(window_dimmer->window());
-      else
-        container->StackChildAtTop(window_dimmer->window());
-      window_dimmer->window()->Show();
-    } else if (window_dimmer) {
-      window_dimmers_->Set(container, nullptr);
-    }
-  }
-}
-
-}  // namespace ash