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