src/ash/wm/default_state.cc

   1 // Copyright 2014 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/default_state.h"
   6
   7 #include "ash/display/display_controller.h"
   8 #include "ash/screen_util.h"
   9 #include "ash/shell.h"
  10 #include "ash/shell_window_ids.h"
  11 #include "ash/wm/coordinate_conversion.h"
  12 #include "ash/wm/dock/docked_window_layout_manager.h"
  13 #include "ash/wm/window_animations.h"
  14 #include "ash/wm/window_state.h"
  15 #include "ash/wm/window_state_delegate.h"
  16 #include "ash/wm/window_state_util.h"
  17 #include "ash/wm/window_util.h"
  18 #include "ash/wm/wm_event.h"
  19 #include "ash/wm/workspace/workspace_window_resizer.h"
  20 #include "ui/aura/client/aura_constants.h"
  21 #include "ui/aura/window.h"
  22 #include "ui/aura/window_delegate.h"
  23 #include "ui/gfx/display.h"
  24 #include "ui/gfx/rect.h"
  25
  26 namespace ash {
  27 namespace wm {
  28 namespace {
  29
  30 // This specifies how much percent (30%) of a window rect
  31 // must be visible when the window is added to the workspace.
  32 const float kMinimumPercentOnScreenArea = 0.3f;
  33
  34 bool IsMinimizedWindowState(const WindowStateType state_type) {
  35   return state_type == WINDOW_STATE_TYPE_MINIMIZED ||
  36          state_type == WINDOW_STATE_TYPE_DOCKED_MINIMIZED;
  37 }
  38
  39 void MoveToDisplayForRestore(WindowState* window_state) {
  40   if (!window_state->HasRestoreBounds())
  41     return;
  42   const gfx::Rect& restore_bounds = window_state->GetRestoreBoundsInScreen();
  43
  44   // Move only if the restore bounds is outside of
  45   // the display. There is no information about in which
  46   // display it should be restored, so this is best guess.
  47   // TODO(oshima): Restore information should contain the
  48   // work area information like WindowResizer does for the
  49   // last window location.
  50   gfx::Rect display_area = Shell::GetScreen()->GetDisplayNearestWindow(
  51       window_state->window()).bounds();
  52
  53   if (!display_area.Intersects(restore_bounds)) {
  54     const gfx::Display& display =
  55         Shell::GetScreen()->GetDisplayMatching(restore_bounds);
  56     DisplayController* display_controller =
  57         Shell::GetInstance()->display_controller();
  58     aura::Window* new_root =
  59         display_controller->GetRootWindowForDisplayId(display.id());
  60     if (new_root != window_state->window()->GetRootWindow()) {
  61       aura::Window* new_container =
  62           Shell::GetContainer(new_root, window_state->window()->parent()->id());
  63       new_container->AddChild(window_state->window());
  64     }
  65   }
  66 }
  67
  68 DockedWindowLayoutManager* GetDockedWindowLayoutManager() {
  69   aura::Window* active_window = ash::wm::GetActiveWindow();
  70   if (active_window) {
  71     aura::Window* dock_container = Shell::GetContainer(
  72       active_window->GetRootWindow(), kShellWindowId_DockedContainer);
  73     DockedWindowLayoutManager* dock_layout =
  74       static_cast<DockedWindowLayoutManager*>(
  75         dock_container->layout_manager());
  76     return dock_layout;
  77   }
  78   return NULL;
  79 }
  80
  81 class ScopedPreferredAlignmentResetter {
  82  public:
  83   ScopedPreferredAlignmentResetter(DockedAlignment dock_alignment,
  84                                    DockedWindowLayoutManager* dock_layout)
  85       : docked_window_layout_manager_(dock_layout) {
  86     docked_window_layout_manager_->set_preferred_alignment(dock_alignment);
  87   }
  88   ~ScopedPreferredAlignmentResetter() {
  89     docked_window_layout_manager_->set_preferred_alignment(
  90         DOCKED_ALIGNMENT_NONE);
  91   }
  92
  93  private:
  94   DockedWindowLayoutManager* docked_window_layout_manager_;
  95
  96   DISALLOW_COPY_AND_ASSIGN(ScopedPreferredAlignmentResetter);
  97 };
  98
  99 class ScopedDockedLayoutEventSourceResetter {
 100  public:
 101   ScopedDockedLayoutEventSourceResetter(DockedWindowLayoutManager* dock_layout)
 102       : docked_window_layout_manager_(dock_layout) {
 103     docked_window_layout_manager_->set_event_source(
 104         DOCKED_ACTION_SOURCE_KEYBOARD);
 105   }
 106   ~ScopedDockedLayoutEventSourceResetter() {
 107     docked_window_layout_manager_->set_event_source(
 108         DOCKED_ACTION_SOURCE_UNKNOWN);
 109   }
 110
 111  private:
 112   DockedWindowLayoutManager* docked_window_layout_manager_;
 113
 114   DISALLOW_COPY_AND_ASSIGN(ScopedDockedLayoutEventSourceResetter);
 115 };
 116
 117 void CycleSnapDock(WindowState* window_state, WMEventType event) {
 118   DockedWindowLayoutManager* dock_layout = GetDockedWindowLayoutManager();
 119   wm::WindowStateType desired_snap_state = event ==
 120       WM_EVENT_CYCLE_SNAP_DOCK_LEFT ? wm::WINDOW_STATE_TYPE_LEFT_SNAPPED :
 121       wm::WINDOW_STATE_TYPE_RIGHT_SNAPPED;
 122   DockedAlignment desired_dock_alignment = event ==
 123       WM_EVENT_CYCLE_SNAP_DOCK_LEFT ?
 124       DOCKED_ALIGNMENT_LEFT : DOCKED_ALIGNMENT_RIGHT;
 125   DockedAlignment current_dock_alignment = dock_layout ?
 126       dock_layout->CalculateAlignment() : DOCKED_ALIGNMENT_NONE;
 127
 128   if (!window_state->IsDocked() ||
 129       (current_dock_alignment != DOCKED_ALIGNMENT_NONE &&
 130        current_dock_alignment != desired_dock_alignment)) {
 131     if (window_state->CanSnap() &&
 132         window_state->GetStateType() != desired_snap_state &&
 133         window_state->window()->type() != ui::wm::WINDOW_TYPE_PANEL) {
 134       const wm::WMEvent event(desired_snap_state ==
 135                               wm::WINDOW_STATE_TYPE_LEFT_SNAPPED ?
 136                               wm::WM_EVENT_SNAP_LEFT : wm::WM_EVENT_SNAP_RIGHT);
 137       window_state->OnWMEvent(&event);
 138       return;
 139     }
 140
 141     if (dock_layout &&
 142         dock_layout->CanDockWindow(window_state->window(),
 143                                    desired_dock_alignment)) {
 144       if (window_state->IsDocked()) {
 145         dock_layout->MaybeSetDesiredDockedAlignment(desired_dock_alignment);
 146         return;
 147       }
 148
 149       ScopedDockedLayoutEventSourceResetter event_source_resetter(dock_layout);
 150       ScopedPreferredAlignmentResetter alignmentResetter(desired_dock_alignment,
 151                                                          dock_layout);
 152       const wm::WMEvent event(wm::WM_EVENT_DOCK);
 153       window_state->OnWMEvent(&event);
 154       return;
 155     }
 156   }
 157
 158   if (window_state->IsDocked() || window_state->IsSnapped()) {
 159     ScopedDockedLayoutEventSourceResetter event_source_resetter(dock_layout);
 160     window_state->Restore();
 161     return;
 162   }
 163   ::wm::AnimateWindow(window_state->window(),
 164                       ::wm::WINDOW_ANIMATION_TYPE_BOUNCE);
 165 }
 166
 167 }  // namespace;
 168
 169 DefaultState::DefaultState(WindowStateType initial_state_type)
 170     : state_type_(initial_state_type) {}
 171 DefaultState::~DefaultState() {}
 172
 173 void DefaultState::OnWMEvent(WindowState* window_state,
 174                              const WMEvent* event) {
 175   if (ProcessWorkspaceEvents(window_state, event))
 176     return;
 177
 178   if (ProcessCompoundEvents(window_state, event))
 179     return;
 180
 181   WindowStateType current_state_type = window_state->GetStateType();
 182   WindowStateType next_state_type = WINDOW_STATE_TYPE_NORMAL;
 183   switch (event->type()) {
 184     case WM_EVENT_NORMAL:
 185       next_state_type =
 186           current_state_type == WINDOW_STATE_TYPE_DOCKED_MINIMIZED ?
 187               WINDOW_STATE_TYPE_DOCKED : WINDOW_STATE_TYPE_NORMAL;
 188       break;
 189     case WM_EVENT_MAXIMIZE:
 190       next_state_type = WINDOW_STATE_TYPE_MAXIMIZED;
 191       break;
 192     case WM_EVENT_MINIMIZE:
 193       next_state_type =
 194           current_state_type == WINDOW_STATE_TYPE_DOCKED ?
 195               WINDOW_STATE_TYPE_DOCKED_MINIMIZED : WINDOW_STATE_TYPE_MINIMIZED;
 196       break;
 197     case WM_EVENT_FULLSCREEN:
 198       next_state_type = WINDOW_STATE_TYPE_FULLSCREEN;
 199       break;
 200     case WM_EVENT_SNAP_LEFT:
 201       next_state_type = WINDOW_STATE_TYPE_LEFT_SNAPPED;
 202       break;
 203     case WM_EVENT_SNAP_RIGHT:
 204       next_state_type = WINDOW_STATE_TYPE_RIGHT_SNAPPED;
 205       break;
 206     case WM_EVENT_DOCK:
 207       next_state_type = WINDOW_STATE_TYPE_DOCKED;
 208       break;
 209     case WM_EVENT_SET_BOUNDS:
 210       SetBounds(window_state, static_cast<const SetBoundsEvent*>(event));
 211       return;
 212     case WM_EVENT_SHOW_INACTIVE:
 213       next_state_type = WINDOW_STATE_TYPE_INACTIVE;
 214       break;
 215     case WM_EVENT_TOGGLE_MAXIMIZE_CAPTION:
 216     case WM_EVENT_TOGGLE_MAXIMIZE:
 217     case WM_EVENT_TOGGLE_VERTICAL_MAXIMIZE:
 218     case WM_EVENT_TOGGLE_HORIZONTAL_MAXIMIZE:
 219     case WM_EVENT_TOGGLE_FULLSCREEN:
 220     case WM_EVENT_CYCLE_SNAP_DOCK_LEFT:
 221     case WM_EVENT_CYCLE_SNAP_DOCK_RIGHT:
 222     case WM_EVENT_CENTER:
 223       NOTREACHED() << "Compound event should not reach here:" << event;
 224       return;
 225     case WM_EVENT_ADDED_TO_WORKSPACE:
 226     case WM_EVENT_WORKAREA_BOUNDS_CHANGED:
 227     case WM_EVENT_DISPLAY_BOUNDS_CHANGED:
 228       NOTREACHED() << "Workspace event should not reach here:" << event;
 229       return;
 230   }
 231
 232   if (next_state_type == current_state_type && window_state->IsSnapped()) {
 233     gfx::Rect snapped_bounds = event->type() == WM_EVENT_SNAP_LEFT ?
 234         GetDefaultLeftSnappedWindowBoundsInParent(window_state->window()) :
 235         GetDefaultRightSnappedWindowBoundsInParent(window_state->window());
 236     window_state->SetBoundsDirectAnimated(snapped_bounds);
 237     return;
 238   }
 239
 240   EnterToNextState(window_state, next_state_type);
 241 }
 242
 243 WindowStateType DefaultState::GetType() const {
 244   return state_type_;
 245 }
 246
 247 void DefaultState::AttachState(
 248     WindowState* window_state,
 249     WindowState::State* state_in_previous_mode) {
 250   DCHECK_EQ(stored_window_state_, window_state);
 251
 252   ReenterToCurrentState(window_state, state_in_previous_mode);
 253
 254   // If the display has changed while in the another mode,
 255   // we need to let windows know the change.
 256   gfx::Display current_display = Shell::GetScreen()->
 257       GetDisplayNearestWindow(window_state->window());
 258   if (stored_display_state_.bounds() != current_display.bounds()) {
 259     const WMEvent event(wm::WM_EVENT_DISPLAY_BOUNDS_CHANGED);
 260     window_state->OnWMEvent(&event);
 261   } else if (stored_display_state_.work_area() != current_display.work_area()) {
 262     const WMEvent event(wm::WM_EVENT_WORKAREA_BOUNDS_CHANGED);
 263     window_state->OnWMEvent(&event);
 264   }
 265 }
 266
 267 void DefaultState::DetachState(WindowState* window_state) {
 268   stored_window_state_ = window_state;
 269   aura::Window* window = window_state->window();
 270   stored_bounds_ = window->bounds();
 271   stored_restore_bounds_ = window_state->HasRestoreBounds() ?
 272       window_state->GetRestoreBoundsInParent() : gfx::Rect();
 273   // Remember the display state so that in case of the display change
 274   // while in the other mode, we can perform necessary action to
 275   // restore the window state to the proper state for the current
 276   // display.
 277   stored_display_state_ = Shell::GetScreen()->
 278       GetDisplayNearestWindow(window_state->window());
 279 }
 280
 281 // static
 282 bool DefaultState::ProcessCompoundEvents(WindowState* window_state,
 283                                          const WMEvent* event) {
 284   aura::Window* window = window_state->window();
 285
 286   switch (event->type()) {
 287     case WM_EVENT_TOGGLE_MAXIMIZE_CAPTION:
 288       if (window_state->IsFullscreen()) {
 289         const wm::WMEvent event(wm::WM_EVENT_TOGGLE_FULLSCREEN);
 290         window_state->OnWMEvent(&event);
 291       } else if (window_state->IsMaximized()) {
 292         window_state->Restore();
 293       } else if (window_state->IsNormalOrSnapped()) {
 294         if (window_state->CanMaximize())
 295           window_state->Maximize();
 296       }
 297       return true;
 298     case WM_EVENT_TOGGLE_MAXIMIZE:
 299       if (window_state->IsFullscreen()) {
 300         const wm::WMEvent event(wm::WM_EVENT_TOGGLE_FULLSCREEN);
 301         window_state->OnWMEvent(&event);
 302       } else if (window_state->IsMaximized()) {
 303         window_state->Restore();
 304       } else if (window_state->CanMaximize()) {
 305         window_state->Maximize();
 306       }
 307       return true;
 308     case WM_EVENT_TOGGLE_VERTICAL_MAXIMIZE: {
 309       gfx::Rect work_area =
 310           ScreenUtil::GetDisplayWorkAreaBoundsInParent(window);
 311
 312       // Maximize vertically if:
 313       // - The window does not have a max height defined.
 314       // - The window has the normal state type. Snapped windows are excluded
 315       //   because they are already maximized vertically and reverting to the
 316       //   restored bounds looks weird.
 317       if (window->delegate()->GetMaximumSize().height() != 0 ||
 318           !window_state->IsNormalStateType()) {
 319         return true;
 320       }
 321       if (window_state->HasRestoreBounds() &&
 322           (window->bounds().height() == work_area.height() &&
 323            window->bounds().y() == work_area.y())) {
 324         window_state->SetAndClearRestoreBounds();
 325       } else {
 326         window_state->SaveCurrentBoundsForRestore();
 327         window->SetBounds(gfx::Rect(window->bounds().x(),
 328                                     work_area.y(),
 329                                     window->bounds().width(),
 330                                     work_area.height()));
 331       }
 332       return true;
 333     }
 334     case WM_EVENT_TOGGLE_HORIZONTAL_MAXIMIZE: {
 335       // Maximize horizontally if:
 336       // - The window does not have a max width defined.
 337       // - The window is snapped or has the normal state type.
 338       if (window->delegate()->GetMaximumSize().width() != 0)
 339         return true;
 340       if (!window_state->IsNormalOrSnapped())
 341         return true;
 342       gfx::Rect work_area =
 343           ScreenUtil::GetDisplayWorkAreaBoundsInParent(window);
 344       if (window_state->IsNormalStateType() &&
 345           window_state->HasRestoreBounds() &&
 346           (window->bounds().width() == work_area.width() &&
 347            window->bounds().x() == work_area.x())) {
 348         window_state->SetAndClearRestoreBounds();
 349       } else {
 350         gfx::Rect new_bounds(work_area.x(),
 351                              window->bounds().y(),
 352                              work_area.width(),
 353                              window->bounds().height());
 354
 355         gfx::Rect restore_bounds = window->bounds();
 356         if (window_state->IsSnapped()) {
 357           window_state->SetRestoreBoundsInParent(new_bounds);
 358           window_state->Restore();
 359
 360           // The restore logic prevents a window from being restored to bounds
 361           // which match the workspace bounds exactly so it is necessary to set
 362           // the bounds again below.
 363         }
 364
 365         window_state->SetRestoreBoundsInParent(restore_bounds);
 366         window->SetBounds(new_bounds);
 367       }
 368       return true;
 369     }
 370     case WM_EVENT_TOGGLE_FULLSCREEN:
 371       ToggleFullScreen(window_state, window_state->delegate());
 372       return true;
 373     case WM_EVENT_CYCLE_SNAP_DOCK_LEFT:
 374     case WM_EVENT_CYCLE_SNAP_DOCK_RIGHT:
 375       CycleSnapDock(window_state, event->type());
 376       return true;
 377     case WM_EVENT_CENTER:
 378       CenterWindow(window_state);
 379       return true;
 380     case WM_EVENT_NORMAL:
 381     case WM_EVENT_MAXIMIZE:
 382     case WM_EVENT_MINIMIZE:
 383     case WM_EVENT_FULLSCREEN:
 384     case WM_EVENT_SNAP_LEFT:
 385     case WM_EVENT_SNAP_RIGHT:
 386     case WM_EVENT_SET_BOUNDS:
 387     case WM_EVENT_SHOW_INACTIVE:
 388     case WM_EVENT_DOCK:
 389       break;
 390     case WM_EVENT_ADDED_TO_WORKSPACE:
 391     case WM_EVENT_WORKAREA_BOUNDS_CHANGED:
 392     case WM_EVENT_DISPLAY_BOUNDS_CHANGED:
 393       NOTREACHED() << "Workspace event should not reach here:" << event;
 394       break;
 395   }
 396   return false;
 397 }
 398
 399 bool DefaultState::ProcessWorkspaceEvents(WindowState* window_state,
 400                                           const WMEvent* event) {
 401   switch (event->type()) {
 402     case WM_EVENT_ADDED_TO_WORKSPACE: {
 403       // When a window is dragged and dropped onto a different
 404       // root window, the bounds will be updated after they are added
 405       // to the root window.
 406       // If a window is opened as maximized or fullscreen, its bounds may be
 407       // empty, so update the bounds now before checking empty.
 408       if (window_state->is_dragged() ||
 409           SetMaximizedOrFullscreenBounds(window_state)) {
 410         return true;
 411       }
 412
 413       aura::Window* window = window_state->window();
 414       gfx::Rect bounds = window->bounds();
 415
 416       // Don't adjust window bounds if the bounds are empty as this
 417       // happens when a new views::Widget is created.
 418       if (bounds.IsEmpty())
 419         return true;
 420
 421       // Only windows of type WINDOW_TYPE_NORMAL or WINDOW_TYPE_PANEL need to be
 422       // adjusted to have minimum visibility, because they are positioned by the
 423       // user and user should always be able to interact with them. Other
 424       // windows are positioned programmatically.
 425       if (window_state->window()->type() != ui::wm::WINDOW_TYPE_NORMAL &&
 426           window_state->window()->type() != ui::wm::WINDOW_TYPE_PANEL) {
 427         return true;
 428       }
 429
 430       // Use entire display instead of workarea because the workarea can
 431       // be further shrunk by the docked area. The logic ensures 30%
 432       // visibility which should be enough to see where the window gets
 433       // moved.
 434       gfx::Rect display_area = ScreenUtil::GetDisplayBoundsInParent(window);
 435       int min_width = bounds.width() * kMinimumPercentOnScreenArea;
 436       int min_height = bounds.height() * kMinimumPercentOnScreenArea;
 437       AdjustBoundsToEnsureWindowVisibility(
 438           display_area, min_width, min_height, &bounds);
 439       window_state->AdjustSnappedBounds(&bounds);
 440       if (window->bounds() != bounds)
 441         window_state->SetBoundsConstrained(bounds);
 442       return true;
 443     }
 444     case WM_EVENT_DISPLAY_BOUNDS_CHANGED: {
 445       if (window_state->is_dragged() ||
 446           SetMaximizedOrFullscreenBounds(window_state)) {
 447         return true;
 448       }
 449       gfx::Rect work_area_in_parent =
 450           ScreenUtil::GetDisplayWorkAreaBoundsInParent(window_state->window());
 451       gfx::Rect bounds = window_state->window()->bounds();
 452       // When display bounds has changed, make sure the entire window is fully
 453       // visible.
 454       bounds.AdjustToFit(work_area_in_parent);
 455       window_state->AdjustSnappedBounds(&bounds);
 456       if (window_state->window()->bounds() != bounds)
 457         window_state->SetBoundsDirectAnimated(bounds);
 458       return true;
 459     }
 460     case WM_EVENT_WORKAREA_BOUNDS_CHANGED: {
 461       if (window_state->is_dragged() ||
 462           SetMaximizedOrFullscreenBounds(window_state)) {
 463         return true;
 464       }
 465       gfx::Rect work_area_in_parent =
 466           ScreenUtil::GetDisplayWorkAreaBoundsInParent(window_state->window());
 467       gfx::Rect bounds = window_state->window()->bounds();
 468       AdjustBoundsToEnsureMinimumWindowVisibility(work_area_in_parent, &bounds);
 469       window_state->AdjustSnappedBounds(&bounds);
 470       if (window_state->window()->bounds() != bounds)
 471         window_state->SetBoundsDirectAnimated(bounds);
 472       return true;
 473     }
 474     case WM_EVENT_TOGGLE_MAXIMIZE_CAPTION:
 475     case WM_EVENT_TOGGLE_MAXIMIZE:
 476     case WM_EVENT_TOGGLE_VERTICAL_MAXIMIZE:
 477     case WM_EVENT_TOGGLE_HORIZONTAL_MAXIMIZE:
 478     case WM_EVENT_TOGGLE_FULLSCREEN:
 479     case WM_EVENT_CYCLE_SNAP_DOCK_LEFT:
 480     case WM_EVENT_CYCLE_SNAP_DOCK_RIGHT:
 481     case WM_EVENT_CENTER:
 482     case WM_EVENT_NORMAL:
 483     case WM_EVENT_MAXIMIZE:
 484     case WM_EVENT_MINIMIZE:
 485     case WM_EVENT_FULLSCREEN:
 486     case WM_EVENT_SNAP_LEFT:
 487     case WM_EVENT_SNAP_RIGHT:
 488     case WM_EVENT_SET_BOUNDS:
 489     case WM_EVENT_SHOW_INACTIVE:
 490     case WM_EVENT_DOCK:
 491       break;
 492   }
 493   return false;
 494 }
 495
 496 // static
 497 bool DefaultState::SetMaximizedOrFullscreenBounds(WindowState* window_state) {
 498   DCHECK(!window_state->is_dragged());
 499   if (window_state->IsMaximized()) {
 500     window_state->SetBoundsDirect(
 501         ScreenUtil::GetMaximizedWindowBoundsInParent(window_state->window()));
 502     return true;
 503   }
 504   if (window_state->IsFullscreen()) {
 505     window_state->SetBoundsDirect(
 506         ScreenUtil::GetDisplayBoundsInParent(window_state->window()));
 507     return true;
 508   }
 509   return false;
 510 }
 511
 512 // static
 513 void DefaultState::SetBounds(WindowState* window_state,
 514                              const SetBoundsEvent* event) {
 515   if (window_state->is_dragged()) {
 516     window_state->SetBoundsDirect(event->requested_bounds());
 517   } else if (window_state->IsSnapped()) {
 518     gfx::Rect work_area_in_parent =
 519         ScreenUtil::GetDisplayWorkAreaBoundsInParent(window_state->window());
 520     gfx::Rect child_bounds(event->requested_bounds());
 521     AdjustBoundsSmallerThan(work_area_in_parent.size(), &child_bounds);
 522     window_state->AdjustSnappedBounds(&child_bounds);
 523     window_state->SetBoundsDirect(child_bounds);
 524   } else if (!SetMaximizedOrFullscreenBounds(window_state)) {
 525     window_state->SetBoundsConstrained(event->requested_bounds());
 526   }
 527 }
 528
 529 void DefaultState::EnterToNextState(WindowState* window_state,
 530                                     WindowStateType next_state_type) {
 531   // Do nothing if  we're already in the same state.
 532   if (state_type_ == next_state_type)
 533     return;
 534
 535   WindowStateType previous_state_type = state_type_;
 536   state_type_ = next_state_type;
 537
 538   window_state->UpdateWindowShowStateFromStateType();
 539   window_state->NotifyPreStateTypeChange(previous_state_type);
 540
 541   if (window_state->window()->parent()) {
 542     if (!window_state->HasRestoreBounds() &&
 543         (previous_state_type == WINDOW_STATE_TYPE_DEFAULT ||
 544          previous_state_type == WINDOW_STATE_TYPE_NORMAL) &&
 545         !window_state->IsMinimized() &&
 546         !window_state->IsNormalStateType()) {
 547       window_state->SaveCurrentBoundsForRestore();
 548     }
 549
 550     // When restoring from a minimized state, we want to restore to the
 551     // previous bounds. However, we want to maintain the restore bounds.
 552     // (The restore bounds are set if a user maximized the window in one
 553     // axis by double clicking the window border for example).
 554     gfx::Rect restore_bounds_in_screen;
 555     if (previous_state_type == WINDOW_STATE_TYPE_MINIMIZED &&
 556         window_state->IsNormalStateType() &&
 557         window_state->HasRestoreBounds() &&
 558         !window_state->unminimize_to_restore_bounds()) {
 559       restore_bounds_in_screen = window_state->GetRestoreBoundsInScreen();
 560       window_state->SaveCurrentBoundsForRestore();
 561     }
 562
 563     if (window_state->IsMaximizedOrFullscreen())
 564       MoveToDisplayForRestore(window_state);
 565
 566     UpdateBoundsFromState(window_state, previous_state_type);
 567
 568     // Normal state should have no restore bounds unless it's
 569     // unminimized.
 570     if (!restore_bounds_in_screen.IsEmpty())
 571       window_state->SetRestoreBoundsInScreen(restore_bounds_in_screen);
 572     else if (window_state->IsNormalStateType())
 573       window_state->ClearRestoreBounds();
 574   }
 575   window_state->NotifyPostStateTypeChange(previous_state_type);
 576 }
 577
 578 void DefaultState::ReenterToCurrentState(
 579     WindowState* window_state,
 580     WindowState::State* state_in_previous_mode) {
 581   WindowStateType previous_state_type = state_in_previous_mode->GetType();
 582   if (previous_state_type == wm::WINDOW_STATE_TYPE_FULLSCREEN) {
 583     // A state change should not move a window out of full screen since full
 584     // screen is a "special mode" the user wanted to be in and should be
 585     // respected as such.
 586     state_type_ = wm::WINDOW_STATE_TYPE_FULLSCREEN;
 587   }
 588   window_state->UpdateWindowShowStateFromStateType();
 589   window_state->NotifyPreStateTypeChange(previous_state_type);
 590
 591   if ((state_type_ == wm::WINDOW_STATE_TYPE_NORMAL ||
 592        state_type_ == wm::WINDOW_STATE_TYPE_DEFAULT) &&
 593       !stored_bounds_.IsEmpty()) {
 594     // Use the restore mechanism to set the bounds for
 595     // the window in normal state. This also covers unminimize case.
 596     window_state->SetRestoreBoundsInParent(stored_bounds_);
 597   }
 598
 599   UpdateBoundsFromState(window_state, state_in_previous_mode->GetType());
 600
 601   // Then restore the restore bounds to their previous value.
 602   if (!stored_restore_bounds_.IsEmpty())
 603     window_state->SetRestoreBoundsInParent(stored_restore_bounds_);
 604   else
 605     window_state->ClearRestoreBounds();
 606
 607   window_state->NotifyPostStateTypeChange(previous_state_type);
 608 }
 609
 610 void DefaultState::UpdateBoundsFromState(WindowState* window_state,
 611                                          WindowStateType previous_state_type) {
 612   aura::Window* window = window_state->window();
 613   gfx::Rect bounds_in_parent;
 614   switch (state_type_) {
 615     case WINDOW_STATE_TYPE_LEFT_SNAPPED:
 616     case WINDOW_STATE_TYPE_RIGHT_SNAPPED:
 617       bounds_in_parent = state_type_ == WINDOW_STATE_TYPE_LEFT_SNAPPED ?
 618           GetDefaultLeftSnappedWindowBoundsInParent(window_state->window()) :
 619           GetDefaultRightSnappedWindowBoundsInParent(window_state->window());
 620       break;
 621     case WINDOW_STATE_TYPE_DOCKED: {
 622       if (window->parent()->id() != kShellWindowId_DockedContainer) {
 623         aura::Window* docked_container = Shell::GetContainer(
 624             window->GetRootWindow(),
 625             kShellWindowId_DockedContainer);
 626         wm::ReparentChildWithTransientChildren(window,
 627             window->parent(),
 628             docked_container);
 629       }
 630       // Return early because we don't want to update the bounds of the
 631       // window below; as the bounds are managed by the dock layout.
 632       return;
 633     }
 634     case WINDOW_STATE_TYPE_DEFAULT:
 635     case WINDOW_STATE_TYPE_NORMAL: {
 636       gfx::Rect work_area_in_parent =
 637           ScreenUtil::GetDisplayWorkAreaBoundsInParent(window_state->window());
 638       if (window_state->HasRestoreBounds()) {
 639         bounds_in_parent = window_state->GetRestoreBoundsInParent();
 640         // Check if the |window|'s restored size is bigger than the working area
 641         // This may happen if a window was resized to maximized bounds or if the
 642         // display resolution changed while the window was maximized.
 643         if (previous_state_type == WINDOW_STATE_TYPE_MAXIMIZED &&
 644             bounds_in_parent.width() >= work_area_in_parent.width() &&
 645             bounds_in_parent.height() >= work_area_in_parent.height()) {
 646           // Inset the bounds slightly so that they are not exactly same as
 647           // the work area bounds and it is easier to resize the window.
 648           bounds_in_parent = work_area_in_parent;
 649           bounds_in_parent.Inset(10, 10, 10, 10);
 650         }
 651       } else {
 652         bounds_in_parent = window->bounds();
 653       }
 654       // Make sure that part of the window is always visible.
 655       AdjustBoundsToEnsureMinimumWindowVisibility(
 656           work_area_in_parent, &bounds_in_parent);
 657       break;
 658     }
 659     case WINDOW_STATE_TYPE_MAXIMIZED:
 660       bounds_in_parent = ScreenUtil::GetMaximizedWindowBoundsInParent(window);
 661       break;
 662
 663     case WINDOW_STATE_TYPE_FULLSCREEN:
 664       bounds_in_parent = ScreenUtil::GetDisplayBoundsInParent(window);
 665       break;
 666
 667     case WINDOW_STATE_TYPE_DOCKED_MINIMIZED:
 668     case WINDOW_STATE_TYPE_MINIMIZED:
 669       break;
 670     case WINDOW_STATE_TYPE_INACTIVE:
 671     case WINDOW_STATE_TYPE_END:
 672     case WINDOW_STATE_TYPE_AUTO_POSITIONED:
 673       return;
 674   }
 675
 676   if (!window_state->IsMinimized()) {
 677     if (IsMinimizedWindowState(previous_state_type) ||
 678         window_state->IsFullscreen()) {
 679       window_state->SetBoundsDirect(bounds_in_parent);
 680     } else if (window_state->IsMaximized() ||
 681                IsMaximizedOrFullscreenWindowStateType(previous_state_type)) {
 682       window_state->SetBoundsDirectCrossFade(bounds_in_parent);
 683     } else if (window_state->is_dragged()) {
 684       // SetBoundsDirectAnimated does not work when the window gets reparented.
 685       // TODO(oshima): Consider fixing it and reenable the animation.
 686       window_state->SetBoundsDirect(bounds_in_parent);
 687     } else {
 688       window_state->SetBoundsDirectAnimated(bounds_in_parent);
 689     }
 690   }
 691
 692   if (window_state->IsMinimized()) {
 693     // Save the previous show state so that we can correctly restore it.
 694     window_state->window()->SetProperty(aura::client::kRestoreShowStateKey,
 695                                         ToWindowShowState(previous_state_type));
 696     ::wm::SetWindowVisibilityAnimationType(
 697         window_state->window(), WINDOW_VISIBILITY_ANIMATION_TYPE_MINIMIZE);
 698
 699     // Hide the window.
 700     window_state->window()->Hide();
 701     // Activate another window.
 702     if (window_state->IsActive())
 703       window_state->Deactivate();
 704   } else if ((window_state->window()->TargetVisibility() ||
 705              IsMinimizedWindowState(previous_state_type)) &&
 706              !window_state->window()->layer()->visible()) {
 707     // The layer may be hidden if the window was previously minimized. Make
 708     // sure it's visible.
 709     window_state->window()->Show();
 710     if (IsMinimizedWindowState(previous_state_type) &&
 711         !window_state->IsMaximizedOrFullscreen()) {
 712       window_state->set_unminimize_to_restore_bounds(false);
 713     }
 714   }
 715 }
 716
 717 // static
 718 void DefaultState::CenterWindow(WindowState* window_state) {
 719   if (!window_state->IsNormalOrSnapped())
 720     return;
 721   aura::Window* window = window_state->window();
 722   if (window_state->IsSnapped()) {
 723     gfx::Rect center_in_screen =
 724         Shell::GetScreen()->GetDisplayNearestWindow(window).work_area();
 725     gfx::Size size = window_state->HasRestoreBounds() ?
 726         window_state->GetRestoreBoundsInScreen().size() :
 727         window->bounds().size();
 728     center_in_screen.ClampToCenteredSize(size);
 729     window_state->SetRestoreBoundsInScreen(center_in_screen);
 730     window_state->Restore();
 731   } else {
 732     gfx::Rect center_in_parent =
 733         ScreenUtil::GetDisplayWorkAreaBoundsInParent(window);
 734     center_in_parent.ClampToCenteredSize(window->bounds().size());
 735     window_state->SetBoundsDirectAnimated(center_in_parent);
 736   }
 737   // Centering window is treated as if a user moved and resized the window.
 738   window_state->set_bounds_changed_by_user(true);
 739 }
 740
 741 }  // namespace wm
 742 }  // namespace ash