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      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/ash_activation_controller.h"
      6 
      7 #include "ash/launcher/launcher.h"
      8 #include "ash/root_window_controller.h"
      9 #include "ash/shelf/shelf_widget.h"
     10 #include "ash/shell.h"
     11 #include "ash/shell_delegate.h"
     12 #include "ash/wm/activation_controller.h"
     13 #include "ash/wm/property_util.h"
     14 #include "ash/wm/window_util.h"
     15 #include "ash/wm/workspace_controller.h"
     16 #include "ui/views/corewm/window_modality_controller.h"
     17 #include "ui/views/widget/widget.h"
     18 
     19 namespace ash {
     20 namespace internal {
     21 
     22 ////////////////////////////////////////////////////////////////////////////////
     23 // AshActivationController, public:
     24 
     25 AshActivationController::AshActivationController() {
     26 }
     27 
     28 AshActivationController::~AshActivationController() {
     29 }
     30 
     31 ////////////////////////////////////////////////////////////////////////////////
     32 // AshActivationController, ActivationControllerDelegate implementation:
     33 
     34 aura::Window* AshActivationController::WillActivateWindow(
     35     aura::Window* window) {
     36   aura::Window* window_modal_transient =
     37       views::corewm::GetModalTransient(window);
     38   if (window_modal_transient)
     39     return window_modal_transient;
     40 
     41   // Fallback to launcher
     42   if (!window)
     43     window = PrepareToActivateLauncher();
     44 
     45   // Restore minimized window. This needs to be done before CanReceiveEvents()
     46   // is called as that function checks window visibility.
     47   if (window && wm::IsWindowMinimized(window))
     48     window->Show();
     49 
     50   // If the screen is locked, just bring the window to top so that
     51   // it will be activated when the lock window is destroyed.
     52   // TODO(beng): Call EventClient directly here, rather than conflating with
     53   //             window visibility.
     54   if (window && !window->CanReceiveEvents())
     55     return NULL;
     56 
     57   // TODO(beng): could probably move to being a ActivationChangeObserver on
     58   //             Shell.
     59   if (window) {
     60     DCHECK(window->GetRootWindow());
     61     Shell::GetInstance()->set_active_root_window(window->GetRootWindow());
     62   }
     63   return window;
     64 }
     65 
     66 aura::Window* AshActivationController::WillFocusWindow(
     67     aura::Window* window) {
     68   aura::Window* window_modal_transient =
     69       views::corewm::GetModalTransient(window);
     70   if (window_modal_transient)
     71     return window_modal_transient;
     72   return window;
     73 }
     74 
     75 aura::Window* AshActivationController::PrepareToActivateLauncher() {
     76   // If workspace controller is not available, then it means that the root
     77   // window is being destroyed. We can't activate any window then.
     78   if (!GetRootWindowController(
     79       Shell::GetActiveRootWindow())->workspace_controller()) {
     80     return NULL;
     81   }
     82   // Fallback to a launcher only when Spoken feedback is enabled.
     83   if (!Shell::GetInstance()->delegate()->IsSpokenFeedbackEnabled())
     84     return NULL;
     85   ShelfWidget* shelf = GetRootWindowController(
     86       Shell::GetActiveRootWindow())->shelf();
     87   // Launcher's window may be already destroyed in shutting down process.
     88   if (!shelf)
     89     return NULL;
     90   // Notify launcher to allow activation via CanActivate().
     91   shelf->WillActivateAsFallback();
     92   return shelf->GetNativeWindow();
     93 }
     94 
     95 }  // namespace internal
     96 }  // namespace ash
     97