Moves mash/wm into ash/mus

mash/wm/shadow_controller.cc

-// Copyright 2015 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 "mash/wm/shadow_controller.h"
-
-#include "components/mus/public/cpp/window.h"
-#include "components/mus/public/cpp/window_tree_client.h"
-#include "mash/wm/property_util.h"
-#include "mash/wm/shadow.h"
-
-namespace mash {
-namespace wm {
-namespace {
-
-// Returns the first ancestor of |from| (including |from|) that has a shadow.
-mus::Window* FindAncestorWithShadow(mus::Window* from) {
-  mus::Window* result = from;
-  while (result && !GetShadow(result))
-    result = result->parent();
-  // Small shadows never change.
-  return result && GetShadow(result)->style() != Shadow::STYLE_SMALL ? result
-                                                                     : nullptr;
-}
-
-}  // namespace
-
-ShadowController::ShadowController(mus::WindowTreeClient* window_tree)
-    : window_tree_(window_tree), active_window_(nullptr) {
-  window_tree_->AddObserver(this);
-  SetActiveWindow(FindAncestorWithShadow(window_tree_->GetFocusedWindow()));
-}
-
-ShadowController::~ShadowController() {
-  window_tree_->RemoveObserver(this);
-  if (active_window_)
-    active_window_->RemoveObserver(this);
-}
-
-void ShadowController::SetActiveWindow(mus::Window* window) {
-  if (window == active_window_)
-    return;
-
-  if (active_window_) {
-    if (GetShadow(active_window_))
-      GetShadow(active_window_)->SetStyle(Shadow::STYLE_INACTIVE);
-    active_window_->RemoveObserver(this);
-  }
-  active_window_ = window;
-  if (active_window_) {
-    GetShadow(active_window_)->SetStyle(Shadow::STYLE_ACTIVE);
-    active_window_->AddObserver(this);
-  }
-}
-
-void ShadowController::OnWindowTreeFocusChanged(mus::Window* gained_focus,
-                                                mus::Window* lost_focus) {
-  SetActiveWindow(FindAncestorWithShadow(gained_focus));
-}
-
-void ShadowController::OnWindowDestroying(mus::Window* window) {
-  DCHECK_EQ(window, active_window_);
-  SetActiveWindow(nullptr);
-}
-
-}  // namespace wm
-}  // namespace mash