ash/wm/app_list_controller.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ash/wm/app_list_controller.h"
   6
   7 #include "ash/ash_switches.h"
   8 #include "ash/root_window_controller.h"
   9 #include "ash/screen_util.h"
  10 #include "ash/shelf/shelf.h"
  11 #include "ash/shelf/shelf_layout_manager.h"
  12 #include "ash/shell.h"
  13 #include "ash/shell_delegate.h"
  14 #include "ash/shell_window_ids.h"
  15 #include "base/command_line.h"
  16 #include "ui/app_list/app_list_constants.h"
  17 #include "ui/app_list/app_list_switches.h"
  18 #include "ui/app_list/pagination_model.h"
  19 #include "ui/app_list/views/app_list_view.h"
  20 #include "ui/aura/client/focus_client.h"
  21 #include "ui/aura/window.h"
  22 #include "ui/aura/window_event_dispatcher.h"
  23 #include "ui/compositor/layer.h"
  24 #include "ui/compositor/scoped_layer_animation_settings.h"
  25 #include "ui/events/event.h"
  26 #include "ui/gfx/transform_util.h"
  27 #include "ui/keyboard/keyboard_controller.h"
  28 #include "ui/views/widget/widget.h"
  29
  30 namespace ash {
  31 namespace {
  32
  33 // Duration for show/hide animation in milliseconds.
  34 const int kAnimationDurationMs = 200;
  35
  36 // Offset in pixels to animation away/towards the shelf.
  37 const int kAnimationOffset = 8;
  38
  39 // The maximum shift in pixels when over-scroll happens.
  40 const int kMaxOverScrollShift = 48;
  41
  42 // The minimal anchor position offset to make sure that the bubble is still on
  43 // the screen with 8 pixels spacing on the left / right. This constant is a
  44 // result of minimal bubble arrow sizes and offsets.
  45 const int kMinimalAnchorPositionOffset = 57;
  46
  47 // The minimal margin (in pixels) around the app list when in centered mode.
  48 const int kMinimalCenteredAppListMargin = 10;
  49
  50 ui::Layer* GetLayer(views::Widget* widget) {
  51   return widget->GetNativeView()->layer();
  52 }
  53
  54 // Gets arrow location based on shelf alignment.
  55 views::BubbleBorder::Arrow GetBubbleArrow(aura::Window* window) {
  56   DCHECK(Shell::HasInstance());
  57   return ShelfLayoutManager::ForShelf(window)->
  58       SelectValueForShelfAlignment(
  59           views::BubbleBorder::BOTTOM_CENTER,
  60           views::BubbleBorder::LEFT_CENTER,
  61           views::BubbleBorder::RIGHT_CENTER,
  62           views::BubbleBorder::TOP_CENTER);
  63 }
  64
  65 // Offset given |rect| towards shelf.
  66 gfx::Rect OffsetTowardsShelf(const gfx::Rect& rect, views::Widget* widget) {
  67   DCHECK(Shell::HasInstance());
  68   ShelfAlignment shelf_alignment = Shell::GetInstance()->GetShelfAlignment(
  69       widget->GetNativeView()->GetRootWindow());
  70   gfx::Rect offseted(rect);
  71   switch (shelf_alignment) {
  72     case SHELF_ALIGNMENT_BOTTOM:
  73       offseted.Offset(0, kAnimationOffset);
  74       break;
  75     case SHELF_ALIGNMENT_LEFT:
  76       offseted.Offset(-kAnimationOffset, 0);
  77       break;
  78     case SHELF_ALIGNMENT_RIGHT:
  79       offseted.Offset(kAnimationOffset, 0);
  80       break;
  81     case SHELF_ALIGNMENT_TOP:
  82       offseted.Offset(0, -kAnimationOffset);
  83       break;
  84   }
  85
  86   return offseted;
  87 }
  88
  89 // Using |button_bounds|, determine the anchor offset so that the bubble gets
  90 // shown above the shelf (used for the alternate shelf theme).
  91 gfx::Vector2d GetAnchorPositionOffsetToShelf(
  92     const gfx::Rect& button_bounds, views::Widget* widget) {
  93   DCHECK(Shell::HasInstance());
  94   ShelfAlignment shelf_alignment = Shell::GetInstance()->GetShelfAlignment(
  95       widget->GetNativeView()->GetRootWindow());
  96   gfx::Point anchor(button_bounds.CenterPoint());
  97   switch (shelf_alignment) {
  98     case SHELF_ALIGNMENT_TOP:
  99     case SHELF_ALIGNMENT_BOTTOM:
 100       if (base::i18n::IsRTL()) {
 101         int screen_width = widget->GetWorkAreaBoundsInScreen().width();
 102         return gfx::Vector2d(
 103             std::min(screen_width - kMinimalAnchorPositionOffset - anchor.x(),
 104                      0), 0);
 105       }
 106       return gfx::Vector2d(
 107           std::max(kMinimalAnchorPositionOffset - anchor.x(), 0), 0);
 108     case SHELF_ALIGNMENT_LEFT:
 109       return gfx::Vector2d(
 110           0, std::max(kMinimalAnchorPositionOffset - anchor.y(), 0));
 111     case SHELF_ALIGNMENT_RIGHT:
 112       return gfx::Vector2d(
 113           0, std::max(kMinimalAnchorPositionOffset - anchor.y(), 0));
 114     default:
 115       NOTREACHED();
 116       return gfx::Vector2d();
 117   }
 118 }
 119
 120 // Gets the point at the center of the display that a particular view is on.
 121 // This calculation excludes the virtual keyboard area. If the height of the
 122 // display area is less than |minimum_height|, its bottom will be extended to
 123 // that height (so that the app list never starts above the top of the screen).
 124 gfx::Point GetCenterOfDisplayForView(const views::View* view,
 125                                      int minimum_height) {
 126   gfx::Rect bounds = Shell::GetScreen()->GetDisplayNearestWindow(
 127       view->GetWidget()->GetNativeView()).bounds();
 128
 129   // If the virtual keyboard is active, subtract it from the display bounds, so
 130   // that the app list is centered in the non-keyboard area of the display.
 131   // (Note that work_area excludes the keyboard, but it doesn't get updated
 132   // until after this function is called.)
 133   keyboard::KeyboardController* keyboard_controller =
 134       keyboard::KeyboardController::GetInstance();
 135   if (keyboard_controller && keyboard_controller->keyboard_visible())
 136     bounds.Subtract(keyboard_controller->current_keyboard_bounds());
 137
 138   // Apply the |minimum_height|.
 139   if (bounds.height() < minimum_height)
 140     bounds.set_height(minimum_height);
 141
 142   return bounds.CenterPoint();
 143 }
 144
 145 // Gets the minimum height of the rectangle to center the app list in.
 146 int GetMinimumBoundsHeightForAppList(const app_list::AppListView* app_list) {
 147   return app_list->bounds().height() + 2 * kMinimalCenteredAppListMargin;
 148 }
 149
 150 }  // namespace
 151
 152 ////////////////////////////////////////////////////////////////////////////////
 153 // AppListController, public:
 154
 155 AppListController::AppListController()
 156     : is_visible_(false),
 157       is_centered_(false),
 158       view_(NULL),
 159       current_apps_page_(-1),
 160       should_snap_back_(false) {
 161   Shell::GetInstance()->AddShellObserver(this);
 162 }
 163
 164 AppListController::~AppListController() {
 165   // Ensures app list view goes before the controller since pagination model
 166   // lives in the controller and app list view would access it on destruction.
 167   if (view_) {
 168     view_->GetAppsPaginationModel()->RemoveObserver(this);
 169     if (view_->GetWidget())
 170       view_->GetWidget()->CloseNow();
 171   }
 172
 173   Shell::GetInstance()->RemoveShellObserver(this);
 174 }
 175
 176 void AppListController::Show(aura::Window* window) {
 177   if (is_visible_)
 178     return;
 179
 180   is_visible_ = true;
 181
 182   // App list needs to know the new shelf layout in order to calculate its
 183   // UI layout when AppListView visibility changes.
 184   Shell::GetPrimaryRootWindowController()->GetShelfLayoutManager()->
 185       UpdateAutoHideState();
 186
 187   if (view_) {
 188     ScheduleAnimation();
 189   } else {
 190     // AppListModel and AppListViewDelegate are owned by AppListView. They
 191     // will be released with AppListView on close.
 192     app_list::AppListView* view = new app_list::AppListView(
 193         Shell::GetInstance()->delegate()->CreateAppListViewDelegate());
 194     aura::Window* root_window = window->GetRootWindow();
 195     aura::Window* container = GetRootWindowController(root_window)->
 196         GetContainer(kShellWindowId_AppListContainer);
 197     views::View* applist_button =
 198         Shelf::ForWindow(container)->GetAppListButtonView();
 199     is_centered_ = view->ShouldCenterWindow();
 200     if (is_centered_) {
 201       // Note: We can't center the app list until we have its dimensions, so we
 202       // init at (0, 0) and then reset its anchor point.
 203       view->InitAsBubbleAtFixedLocation(container,
 204                                         current_apps_page_,
 205                                         gfx::Point(),
 206                                         views::BubbleBorder::FLOAT,
 207                                         true /* border_accepts_events */);
 208       // The experimental app list is centered over the display of the app list
 209       // button that was pressed (if triggered via keyboard, this is the display
 210       // with the currently focused window).
 211       view->SetAnchorPoint(GetCenterOfDisplayForView(
 212           applist_button, GetMinimumBoundsHeightForAppList(view)));
 213     } else {
 214       gfx::Rect applist_button_bounds = applist_button->GetBoundsInScreen();
 215       // We need the location of the button within the local screen.
 216       applist_button_bounds = ScreenUtil::ConvertRectFromScreen(
 217           root_window,
 218           applist_button_bounds);
 219       view->InitAsBubbleAttachedToAnchor(
 220           container,
 221           current_apps_page_,
 222           Shelf::ForWindow(container)->GetAppListButtonView(),
 223           GetAnchorPositionOffsetToShelf(
 224               applist_button_bounds,
 225               Shelf::ForWindow(container)->GetAppListButtonView()->GetWidget()),
 226           GetBubbleArrow(container),
 227           true /* border_accepts_events */);
 228       view->SetArrowPaintType(views::BubbleBorder::PAINT_NONE);
 229     }
 230     SetView(view);
 231     // By setting us as DnD recipient, the app list knows that we can
 232     // handle items.
 233     SetDragAndDropHostOfCurrentAppList(
 234         Shelf::ForWindow(window)->GetDragAndDropHostForAppList());
 235   }
 236   // Update applist button status when app list visibility is changed.
 237   Shelf::ForWindow(window)->GetAppListButtonView()->SchedulePaint();
 238 }
 239
 240 void AppListController::Dismiss() {
 241   if (!is_visible_)
 242     return;
 243
 244   // If the app list is currently visible, there should be an existing view.
 245   DCHECK(view_);
 246
 247   is_visible_ = false;
 248
 249   // App list needs to know the new shelf layout in order to calculate its
 250   // UI layout when AppListView visibility changes.
 251   Shell::GetPrimaryRootWindowController()
 252       ->GetShelfLayoutManager()
 253       ->UpdateAutoHideState();
 254
 255   // Our widget is currently active. When the animation completes we'll hide
 256   // the widget, changing activation. If a menu is shown before the animation
 257   // completes then the activation change triggers the menu to close. By
 258   // deactivating now we ensure there is no activation change when the
 259   // animation completes and any menus stay open.
 260   view_->GetWidget()->Deactivate();
 261   ScheduleAnimation();
 262
 263   // Update applist button status when app list visibility is changed.
 264   Shelf::ForWindow(view_->GetWidget()->GetNativeView())
 265       ->GetAppListButtonView()
 266       ->SchedulePaint();
 267 }
 268
 269 bool AppListController::IsVisible() const {
 270   return view_ && view_->GetWidget()->IsVisible();
 271 }
 272
 273 aura::Window* AppListController::GetWindow() {
 274   return is_visible_ && view_ ? view_->GetWidget()->GetNativeWindow() : NULL;
 275 }
 276
 277 ////////////////////////////////////////////////////////////////////////////////
 278 // AppListController, private:
 279
 280 void AppListController::SetDragAndDropHostOfCurrentAppList(
 281     app_list::ApplicationDragAndDropHost* drag_and_drop_host) {
 282   if (view_ && is_visible_)
 283     view_->SetDragAndDropHostOfCurrentAppList(drag_and_drop_host);
 284 }
 285
 286 void AppListController::SetView(app_list::AppListView* view) {
 287   DCHECK(view_ == NULL);
 288   DCHECK(is_visible_);
 289
 290   view_ = view;
 291   views::Widget* widget = view_->GetWidget();
 292   widget->AddObserver(this);
 293   keyboard::KeyboardController* keyboard_controller =
 294       keyboard::KeyboardController::GetInstance();
 295   if (keyboard_controller)
 296     keyboard_controller->AddObserver(this);
 297   Shell::GetInstance()->AddPreTargetHandler(this);
 298   Shelf::ForWindow(widget->GetNativeWindow())->AddIconObserver(this);
 299   widget->GetNativeView()->GetRootWindow()->AddObserver(this);
 300   aura::client::GetFocusClient(widget->GetNativeView())->AddObserver(this);
 301
 302   view_->GetAppsPaginationModel()->AddObserver(this);
 303
 304   view_->ShowWhenReady();
 305 }
 306
 307 void AppListController::ResetView() {
 308   if (!view_)
 309     return;
 310
 311   views::Widget* widget = view_->GetWidget();
 312   widget->RemoveObserver(this);
 313   GetLayer(widget)->GetAnimator()->RemoveObserver(this);
 314   keyboard::KeyboardController* keyboard_controller =
 315       keyboard::KeyboardController::GetInstance();
 316   if (keyboard_controller)
 317     keyboard_controller->RemoveObserver(this);
 318   Shell::GetInstance()->RemovePreTargetHandler(this);
 319   Shelf::ForWindow(widget->GetNativeWindow())->RemoveIconObserver(this);
 320   widget->GetNativeView()->GetRootWindow()->RemoveObserver(this);
 321   aura::client::GetFocusClient(widget->GetNativeView())->RemoveObserver(this);
 322
 323   view_->GetAppsPaginationModel()->RemoveObserver(this);
 324
 325   view_ = NULL;
 326 }
 327
 328 void AppListController::ScheduleAnimation() {
 329   // Stop observing previous animation.
 330   StopObservingImplicitAnimations();
 331
 332   views::Widget* widget = view_->GetWidget();
 333   ui::Layer* layer = GetLayer(widget);
 334   layer->GetAnimator()->StopAnimating();
 335
 336   gfx::Rect target_bounds;
 337   if (is_visible_) {
 338     target_bounds = widget->GetWindowBoundsInScreen();
 339     widget->SetBounds(OffsetTowardsShelf(target_bounds, widget));
 340   } else {
 341     target_bounds = OffsetTowardsShelf(widget->GetWindowBoundsInScreen(),
 342                                        widget);
 343   }
 344
 345   ui::ScopedLayerAnimationSettings animation(layer->GetAnimator());
 346   animation.SetTransitionDuration(
 347       base::TimeDelta::FromMilliseconds(
 348           is_visible_ ? 0 : kAnimationDurationMs));
 349   animation.AddObserver(this);
 350
 351   layer->SetOpacity(is_visible_ ? 1.0 : 0.0);
 352   widget->SetBounds(target_bounds);
 353 }
 354
 355 void AppListController::ProcessLocatedEvent(ui::LocatedEvent* event) {
 356   if (!view_ || !is_visible_)
 357     return;
 358
 359   // If the event happened on a menu, then the event should not close the app
 360   // list.
 361   aura::Window* target = static_cast<aura::Window*>(event->target());
 362   if (target) {
 363     RootWindowController* root_controller =
 364         GetRootWindowController(target->GetRootWindow());
 365     if (root_controller) {
 366       aura::Window* menu_container =
 367           root_controller->GetContainer(kShellWindowId_MenuContainer);
 368       if (menu_container->Contains(target))
 369         return;
 370       aura::Window* keyboard_container = root_controller->GetContainer(
 371           kShellWindowId_VirtualKeyboardContainer);
 372       if (keyboard_container->Contains(target))
 373         return;
 374     }
 375   }
 376
 377   aura::Window* window = view_->GetWidget()->GetNativeView()->parent();
 378   if (!window->Contains(target))
 379     Dismiss();
 380 }
 381
 382 void AppListController::UpdateBounds() {
 383   if (!view_ || !is_visible_)
 384     return;
 385
 386   view_->UpdateBounds();
 387
 388   if (is_centered_)
 389     view_->SetAnchorPoint(GetCenterOfDisplayForView(
 390         view_, GetMinimumBoundsHeightForAppList(view_)));
 391 }
 392
 393 ////////////////////////////////////////////////////////////////////////////////
 394 // AppListController, aura::EventFilter implementation:
 395
 396 void AppListController::OnMouseEvent(ui::MouseEvent* event) {
 397   if (event->type() == ui::ET_MOUSE_PRESSED)
 398     ProcessLocatedEvent(event);
 399 }
 400
 401 void AppListController::OnGestureEvent(ui::GestureEvent* event) {
 402   if (event->type() == ui::ET_GESTURE_TAP_DOWN)
 403     ProcessLocatedEvent(event);
 404 }
 405
 406 ////////////////////////////////////////////////////////////////////////////////
 407 // AppListController,  aura::FocusObserver implementation:
 408
 409 void AppListController::OnWindowFocused(aura::Window* gained_focus,
 410                                         aura::Window* lost_focus) {
 411   if (view_ && is_visible_) {
 412     aura::Window* applist_window = view_->GetWidget()->GetNativeView();
 413     aura::Window* applist_container = applist_window->parent();
 414
 415     if (applist_container->Contains(lost_focus) &&
 416         (!gained_focus || !applist_container->Contains(gained_focus))) {
 417       Dismiss();
 418     }
 419   }
 420 }
 421
 422 ////////////////////////////////////////////////////////////////////////////////
 423 // AppListController,  aura::WindowObserver implementation:
 424 void AppListController::OnWindowBoundsChanged(aura::Window* root,
 425                                               const gfx::Rect& old_bounds,
 426                                               const gfx::Rect& new_bounds) {
 427   UpdateBounds();
 428 }
 429
 430 ////////////////////////////////////////////////////////////////////////////////
 431 // AppListController, ui::ImplicitAnimationObserver implementation:
 432
 433 void AppListController::OnImplicitAnimationsCompleted() {
 434   if (is_visible_ )
 435     view_->GetWidget()->Activate();
 436   else
 437     view_->GetWidget()->Close();
 438 }
 439
 440 ////////////////////////////////////////////////////////////////////////////////
 441 // AppListController, views::WidgetObserver implementation:
 442
 443 void AppListController::OnWidgetDestroying(views::Widget* widget) {
 444   DCHECK(view_->GetWidget() == widget);
 445   if (is_visible_)
 446     Dismiss();
 447   ResetView();
 448 }
 449
 450 ////////////////////////////////////////////////////////////////////////////////
 451 // AppListController, keyboard::KeyboardControllerObserver implementation:
 452
 453 void AppListController::OnKeyboardBoundsChanging(const gfx::Rect& new_bounds) {
 454   UpdateBounds();
 455 }
 456
 457 ////////////////////////////////////////////////////////////////////////////////
 458 // AppListController, ShellObserver implementation:
 459 void AppListController::OnShelfAlignmentChanged(aura::Window* root_window) {
 460   if (view_)
 461     view_->SetBubbleArrow(GetBubbleArrow(view_->GetWidget()->GetNativeView()));
 462 }
 463
 464 ////////////////////////////////////////////////////////////////////////////////
 465 // AppListController, ShelfIconObserver implementation:
 466
 467 void AppListController::OnShelfIconPositionsChanged() {
 468   UpdateBounds();
 469 }
 470
 471 ////////////////////////////////////////////////////////////////////////////////
 472 // AppListController, PaginationModelObserver implementation:
 473
 474 void AppListController::TotalPagesChanged() {
 475 }
 476
 477 void AppListController::SelectedPageChanged(int old_selected,
 478                                             int new_selected) {
 479   current_apps_page_ = new_selected;
 480 }
 481
 482 void AppListController::TransitionStarted() {
 483 }
 484
 485 void AppListController::TransitionChanged() {
 486   // |view_| could be NULL when app list is closed with a running transition.
 487   if (!view_)
 488     return;
 489
 490   app_list::PaginationModel* pagination_model = view_->GetAppsPaginationModel();
 491
 492   const app_list::PaginationModel::Transition& transition =
 493       pagination_model->transition();
 494   if (pagination_model->is_valid_page(transition.target_page))
 495     return;
 496
 497   views::Widget* widget = view_->GetWidget();
 498   ui::LayerAnimator* widget_animator = GetLayer(widget)->GetAnimator();
 499   if (!pagination_model->IsRevertingCurrentTransition()) {
 500     // Update cached |view_bounds_| if it is the first over-scroll move and
 501     // widget does not have running animations.
 502     if (!should_snap_back_ && !widget_animator->is_animating())
 503       view_bounds_ = widget->GetWindowBoundsInScreen();
 504
 505     const int current_page = pagination_model->selected_page();
 506     const int dir = transition.target_page > current_page ? -1 : 1;
 507
 508     const double progress = 1.0 - pow(1.0 - transition.progress, 4);
 509     const int shift = kMaxOverScrollShift * progress * dir;
 510
 511     gfx::Rect shifted(view_bounds_);
 512     shifted.set_x(shifted.x() + shift);
 513     widget->SetBounds(shifted);
 514     should_snap_back_ = true;
 515   } else if (should_snap_back_) {
 516     should_snap_back_ = false;
 517     ui::ScopedLayerAnimationSettings animation(widget_animator);
 518     animation.SetTransitionDuration(base::TimeDelta::FromMilliseconds(
 519         app_list::kOverscrollPageTransitionDurationMs));
 520     widget->SetBounds(view_bounds_);
 521   }
 522 }
 523
 524 }  // namespace ash