AppListController refactoring part 1: AppListShower implementation.

ui/app_list/shower/app_list_shower_impl.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 "ui/app_list/shower/app_list_shower_impl.h"
+
+#include "ui/app_list/app_list_constants.h"
+#include "ui/app_list/app_list_switches.h"
+#include "ui/app_list/pagination_model.h"
+#include "ui/app_list/shower/app_list_shower_delegate_factory.h"
+#include "ui/app_list/views/app_list_view.h"
+#include "ui/aura/client/focus_client.h"
+#include "ui/aura/window.h"
+#include "ui/compositor/layer.h"
+#include "ui/compositor/scoped_layer_animation_settings.h"
+#include "ui/views/widget/widget.h"
+
+namespace app_list {
+namespace {
+
+// Duration for show/hide animation in milliseconds.
+const int kAnimationDurationMs = 200;
+
+// The maximum shift in pixels when over-scroll happens.
+const int kMaxOverScrollShift = 48;
+
+ui::Layer* GetLayer(views::Widget* widget) {
+  return widget->GetNativeView()->layer();
+}
+
+}  // namespace
+
+AppListShowerImpl::AppListShowerImpl(AppListShowerDelegateFactory* factory)
+    : factory_(factory) {
+  DCHECK(factory);
+}
+
+AppListShowerImpl::~AppListShowerImpl() {
+  shower_delegate_.reset();
+  // Ensures app list view goes before the controller since pagination model
+  // lives in the controller and app list view would access it on destruction.
+  if (view_) {
+    view_->GetAppsPaginationModel()->RemoveObserver(this);
+    if (view_->GetWidget())
+      view_->GetWidget()->CloseNow();
+  }
+}
+
+aura::Window* AppListShowerImpl::GetWindow() {
+  return is_visible_ && view_ ? view_->GetWidget()->GetNativeWindow() : nullptr;
+}
+
+void AppListShowerImpl::Show(aura::Window* window) {
+  if (is_visible_)
+    return;
+
+  DCHECK(window);
+  is_visible_ = true;
+  aura::Window* root_window = window->GetRootWindow();
+  if (view_) {
+    ScheduleAnimation();
+  } else {
+    shower_delegate_ = factory_->GetDelegate(this);
+    AppListViewDelegate* view_delegate = shower_delegate_->GetViewDelegate();
+    DCHECK(view_delegate);
+    // Note the AppListViewDelegate outlives the AppListView. For Ash, the view
+    // is destroyed when dismissed.
+    AppListView* view = new AppListView(view_delegate);
+    shower_delegate_->Init(view, root_window, current_apps_page_);
+    SetView(view);
+  }
+  shower_delegate_->OnShown(root_window);
+}
+
+void AppListShowerImpl::Dismiss() {
+  if (!is_visible_)
+    return;
+
+  // If the app list is currently visible, there should be an existing view.
+  DCHECK(view_);
+
+  is_visible_ = false;
+
+  // Our widget is currently active. When the animation completes we'll hide
+  // the widget, changing activation. If a menu is shown before the animation
+  // completes then the activation change triggers the menu to close. By
+  // deactivating now we ensure there is no activation change when the
+  // animation completes and any menus stay open.
+  view_->GetWidget()->Deactivate();
+
+  shower_delegate_->OnDismissed();
+  ScheduleAnimation();
+}
+
+bool AppListShowerImpl::IsVisible() const {
+  return view_ && view_->GetWidget()->IsVisible();
+}
+
+bool AppListShowerImpl::GetTargetVisibility() const {
+  return is_visible_;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// AppListShowerImpl, private:
+
+void AppListShowerImpl::SetView(AppListView* view) {
+  DCHECK(view_ == nullptr);
+  DCHECK(is_visible_);
+
+  view_ = view;
+  views::Widget* widget = view_->GetWidget();
+  widget->AddObserver(this);
+  widget->GetNativeView()->GetRootWindow()->AddObserver(this);
+  aura::client::GetFocusClient(widget->GetNativeView())->AddObserver(this);
+  view_->GetAppsPaginationModel()->AddObserver(this);
+  view_->ShowWhenReady();
+}
+
+void AppListShowerImpl::ResetView() {
+  if (!view_)
+    return;
+
+  views::Widget* widget = view_->GetWidget();
+  widget->RemoveObserver(this);
+  GetLayer(widget)->GetAnimator()->RemoveObserver(this);
+  shower_delegate_.reset();
+  widget->GetNativeView()->GetRootWindow()->RemoveObserver(this);
+  aura::client::GetFocusClient(widget->GetNativeView())->RemoveObserver(this);
+
+  view_->GetAppsPaginationModel()->RemoveObserver(this);
+
+  view_ = nullptr;
+}
+
+void AppListShowerImpl::ScheduleAnimation() {
+  // Stop observing previous animation.
+  StopObservingImplicitAnimations();
+
+  views::Widget* widget = view_->GetWidget();
+  ui::Layer* layer = GetLayer(widget);
+  layer->GetAnimator()->StopAnimating();
+
+  gfx::Rect target_bounds;
+  gfx::Vector2d offset = shower_delegate_->GetVisibilityAnimationOffset(
+      widget->GetNativeView()->GetRootWindow());
+  if (is_visible_) {
+    target_bounds = widget->GetWindowBoundsInScreen();
+    gfx::Rect start_bounds = gfx::Rect(target_bounds);
+    start_bounds.Offset(offset);
+    widget->SetBounds(start_bounds);
+  } else {
+    target_bounds = widget->GetWindowBoundsInScreen();
+    target_bounds.Offset(offset);
+  }
+
+  ui::ScopedLayerAnimationSettings animation(layer->GetAnimator());
+  animation.SetTransitionDuration(base::TimeDelta::FromMilliseconds(
+      is_visible_ ? 0 : kAnimationDurationMs));
+  animation.AddObserver(this);
+
+  layer->SetOpacity(is_visible_ ? 1.0 : 0.0);
+  widget->SetBounds(target_bounds);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// AppListShowerImpl,  aura::client::FocusChangeObserver implementation:
+
+void AppListShowerImpl::OnWindowFocused(aura::Window* gained_focus,
+                                        aura::Window* lost_focus) {
+  if (view_ && is_visible_) {
+    aura::Window* applist_window = view_->GetWidget()->GetNativeView();
+    aura::Window* applist_container = applist_window->parent();
+    if (applist_container->Contains(lost_focus) &&
+        (!gained_focus || !applist_container->Contains(gained_focus)) &&
+        !switches::ShouldNotDismissOnBlur()) {
+      Dismiss();
+    }
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// AppListShowerImpl,  aura::WindowObserver implementation:
+void AppListShowerImpl::OnWindowBoundsChanged(aura::Window* root,
+                                              const gfx::Rect& old_bounds,
+                                              const gfx::Rect& new_bounds) {
+  if (shower_delegate_)
+    shower_delegate_->UpdateBounds();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// AppListShowerImpl, ui::ImplicitAnimationObserver implementation:
+
+void AppListShowerImpl::OnImplicitAnimationsCompleted() {
+  if (is_visible_)
+    view_->GetWidget()->Activate();
+  else
+    view_->GetWidget()->Close();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// AppListShowerImpl, views::WidgetObserver implementation:
+
+void AppListShowerImpl::OnWidgetDestroying(views::Widget* widget) {
+  DCHECK(view_->GetWidget() == widget);
+  if (is_visible_)
+    Dismiss();
+  ResetView();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// AppListShowerImpl, PaginationModelObserver implementation:
+
+void AppListShowerImpl::TotalPagesChanged() {}
+
+void AppListShowerImpl::SelectedPageChanged(int old_selected,
+                                            int new_selected) {
+  current_apps_page_ = new_selected;
+}
+
+void AppListShowerImpl::TransitionStarted() {}
+
+void AppListShowerImpl::TransitionChanged() {
+  // |view_| could be NULL when app list is closed with a running transition.
+  if (!view_)
+    return;
+
+  PaginationModel* pagination_model = view_->GetAppsPaginationModel();
+
+  const PaginationModel::Transition& transition =
+      pagination_model->transition();
+  if (pagination_model->is_valid_page(transition.target_page))
+    return;
+
+  views::Widget* widget = view_->GetWidget();
+  ui::LayerAnimator* widget_animator =
+      widget->GetNativeView()->layer()->GetAnimator();
+  if (!pagination_model->IsRevertingCurrentTransition()) {
+    // Update cached |view_bounds_| if it is the first over-scroll move and
+    // widget does not have running animations.
+    if (!should_snap_back_ && !widget_animator->is_animating())
+      view_bounds_ = widget->GetWindowBoundsInScreen();
+
+    const int current_page = pagination_model->selected_page();
+    const int dir = transition.target_page > current_page ? -1 : 1;
+
+    const double progress = 1.0 - pow(1.0 - transition.progress, 4);
+    const int shift = kMaxOverScrollShift * progress * dir;
+
+    gfx::Rect shifted(view_bounds_);
+    shifted.set_x(shifted.x() + shift);
+
+    widget->SetBounds(shifted);
+
+    should_snap_back_ = true;
+  } else if (should_snap_back_) {
+    should_snap_back_ = false;
+    ui::ScopedLayerAnimationSettings animation(widget_animator);
+    animation.SetTransitionDuration(
+        base::TimeDelta::FromMilliseconds(kOverscrollPageTransitionDurationMs));
+    widget->SetBounds(view_bounds_);
+  }
+}
+
+}  // namespace app_list