chromeos: Move files in //ash/common to //ash, part 2

ash/common/wm/maximize_mode/workspace_backdrop_delegate.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 "ash/common/wm/maximize_mode/workspace_backdrop_delegate.h"
-
-#include "ash/common/wm/workspace/workspace_layout_manager_backdrop_delegate.h"
-#include "ash/common/wm_window.h"
-#include "ash/public/cpp/shell_window_ids.h"
-#include "ash/root_window_controller.h"
-#include "base/auto_reset.h"
-#include "ui/aura/window_observer.h"
-#include "ui/compositor/layer.h"
-#include "ui/compositor/scoped_layer_animation_settings.h"
-#include "ui/views/background.h"
-#include "ui/views/widget/widget.h"
-#include "ui/wm/core/window_animations.h"
-#include "ui/wm/core/window_util.h"
-
-namespace ash {
-namespace {
-
-// The opacity of the backdrop.
-const float kBackdropOpacity = 0.5f;
-
-}  // namespace
-
-class WorkspaceBackdropDelegate::WindowObserverImpl
-    : public aura::WindowObserver {
- public:
-  explicit WindowObserverImpl(WorkspaceBackdropDelegate* delegate)
-      : delegate_(delegate) {}
-  ~WindowObserverImpl() override {}
-
- private:
-  // aura::WindowObserver overrides:
-  void OnWindowBoundsChanged(aura::Window* window,
-                             const gfx::Rect& old_bounds,
-                             const gfx::Rect& new_bounds) override {
-    // The container size has changed and the layer needs to be adapt to it.
-    delegate_->AdjustToContainerBounds();
-  }
-
-  WorkspaceBackdropDelegate* delegate_;
-
-  DISALLOW_COPY_AND_ASSIGN(WindowObserverImpl);
-};
-
-WorkspaceBackdropDelegate::WorkspaceBackdropDelegate(WmWindow* container)
-    : container_observer_(new WindowObserverImpl(this)),
-      container_(container),
-      in_restacking_(false) {
-  background_ = new views::Widget;
-  views::Widget::InitParams params(
-      views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
-  params.bounds = container_->GetBoundsInScreen();
-  params.layer_type = ui::LAYER_SOLID_COLOR;
-  params.name = "WorkspaceBackdropDelegate";
-  // To disallow the MRU list from picking this window up it should not be
-  // activateable.
-  params.activatable = views::Widget::InitParams::ACTIVATABLE_NO;
-  DCHECK_NE(kShellWindowId_Invalid, container_->GetShellWindowId());
-  container_->GetRootWindowController()->ConfigureWidgetInitParamsForContainer(
-      background_, container_->GetShellWindowId(), &params);
-  background_->Init(params);
-  background_window_ = WmWindow::Get(background_->GetNativeWindow());
-  // Do not use the animation system. We don't want the bounds animation and
-  // opacity needs to get set to |kBackdropOpacity|.
-  background_window_->SetVisibilityAnimationTransition(::wm::ANIMATE_NONE);
-  background_window_->GetLayer()->SetColor(SK_ColorBLACK);
-  // Make sure that the layer covers visibly everything - including the shelf.
-  background_window_->GetLayer()->SetBounds(params.bounds);
-  DCHECK(background_window_->GetBounds() == params.bounds);
-  Show();
-  RestackBackdrop();
-  container_->aura_window()->AddObserver(container_observer_.get());
-}
-
-WorkspaceBackdropDelegate::~WorkspaceBackdropDelegate() {
-  container_->aura_window()->RemoveObserver(container_observer_.get());
-  // TODO: animations won't work right with mus: http://crbug.com/548396.
-  ::wm::ScopedHidingAnimationSettings hiding_settings(
-      background_->GetNativeView());
-  background_->Close();
-  background_window_->GetLayer()->SetOpacity(0.0f);
-}
-
-void WorkspaceBackdropDelegate::OnWindowAddedToLayout(WmWindow* child) {
-  RestackBackdrop();
-}
-
-void WorkspaceBackdropDelegate::OnWindowRemovedFromLayout(WmWindow* child) {
-  RestackBackdrop();
-}
-
-void WorkspaceBackdropDelegate::OnChildWindowVisibilityChanged(WmWindow* child,
-                                                               bool visible) {
-  RestackBackdrop();
-}
-
-void WorkspaceBackdropDelegate::OnWindowStackingChanged(WmWindow* window) {
-  RestackBackdrop();
-}
-
-void WorkspaceBackdropDelegate::OnPostWindowStateTypeChange(
-    wm::WindowState* window_state,
-    wm::WindowStateType old_type) {
-  RestackBackdrop();
-}
-
-void WorkspaceBackdropDelegate::OnDisplayWorkAreaInsetsChanged() {
-  AdjustToContainerBounds();
-}
-
-void WorkspaceBackdropDelegate::RestackBackdrop() {
-  // Avoid recursive calls.
-  if (in_restacking_)
-    return;
-
-  WmWindow* window = GetCurrentTopWindow();
-  if (!window) {
-    // Hide backdrop since no suitable window was found.
-    background_->Hide();
-    return;
-  }
-  if (window == background_window_ && background_->IsVisible())
-    return;
-  if (window->GetRootWindow() != background_window_->GetRootWindow())
-    return;
-  // We are changing the order of windows which will cause recursion.
-  base::AutoReset<bool> lock(&in_restacking_, true);
-  if (!background_->IsVisible())
-    Show();
-  // Since the backdrop needs to be immediately behind the window and the
-  // stacking functions only guarantee a "it's above or below", we need
-  // to re-arrange the two windows twice.
-  container_->StackChildAbove(background_window_, window);
-  container_->StackChildAbove(window, background_window_);
-}
-
-WmWindow* WorkspaceBackdropDelegate::GetCurrentTopWindow() {
-  const WmWindow::Windows windows = container_->GetChildren();
-  for (auto window_iter = windows.rbegin(); window_iter != windows.rend();
-       ++window_iter) {
-    WmWindow* window = *window_iter;
-    if (window->GetTargetVisibility() &&
-        window->GetType() == ui::wm::WINDOW_TYPE_NORMAL &&
-        window->CanActivate())
-      return window;
-  }
-  return nullptr;
-}
-
-void WorkspaceBackdropDelegate::AdjustToContainerBounds() {
-  // Cover the entire container window.
-  gfx::Rect target_rect(gfx::Point(0, 0), container_->GetBounds().size());
-  if (target_rect != background_window_->GetBounds()) {
-    // TODO: this won't work right with mus: http://crbug.com/548396.
-    // This needs to be instant.
-    ui::ScopedLayerAnimationSettings settings(
-        background_window_->GetLayer()->GetAnimator());
-    settings.SetTransitionDuration(base::TimeDelta::FromMilliseconds(0));
-    background_window_->SetBounds(target_rect);
-    if (!background_->IsVisible())
-      background_window_->GetLayer()->SetOpacity(kBackdropOpacity);
-  }
-}
-
-void WorkspaceBackdropDelegate::Show() {
-  background_window_->GetLayer()->SetOpacity(0.0f);
-  background_->Show();
-  ui::ScopedLayerAnimationSettings settings(
-      background_window_->GetLayer()->GetAnimator());
-  background_window_->GetLayer()->SetOpacity(kBackdropOpacity);
-}
-
-}  // namespace ash