ui/wm/core/default_activation_client.h

   1 // Copyright 2013 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 #ifndef UI_WM_CORE_DEFAULT_ACTIVATION_CLIENT_H_
   6 #define UI_WM_CORE_DEFAULT_ACTIVATION_CLIENT_H_
   7
   8 #include <vector>
   9
  10 #include "base/compiler_specific.h"
  11 #include "base/logging.h"
  12 #include "base/observer_list.h"
  13 #include "ui/aura/window_observer.h"
  14 #include "ui/wm/public/activation_client.h"
  15 #include "ui/wm/wm_export.h"
  16
  17 namespace aura {
  18 namespace client {
  19 class ActivationChangeObserver;
  20 }
  21 }
  22
  23 namespace wm {
  24
  25 // Simple ActivationClient implementation for use by tests and other targets
  26 // that just need basic behavior (e.g. activate windows whenever requested,
  27 // restack windows at the top when they're activated, etc.). This object deletes
  28 // itself when the root window it is associated with is destroyed.
  29 class WM_EXPORT DefaultActivationClient : public aura::client::ActivationClient,
  30                                           public aura::WindowObserver {
  31  public:
  32   explicit DefaultActivationClient(aura::Window* root_window);
  33
  34   // Overridden from aura::client::ActivationClient:
  35   void AddObserver(aura::client::ActivationChangeObserver* observer) override;
  36   void RemoveObserver(
  37       aura::client::ActivationChangeObserver* observer) override;
  38   void ActivateWindow(aura::Window* window) override;
  39   void DeactivateWindow(aura::Window* window) override;
  40   aura::Window* GetActiveWindow() override;
  41   aura::Window* GetActivatableWindow(aura::Window* window) override;
  42   aura::Window* GetToplevelWindow(aura::Window* window) override;
  43   bool CanActivateWindow(aura::Window* window) const override;
  44
  45   // Overridden from WindowObserver:
  46   void OnWindowDestroyed(aura::Window* window) override;
  47
  48  private:
  49   class Deleter;
  50
  51   ~DefaultActivationClient() override;
  52   void RemoveActiveWindow(aura::Window* window);
  53
  54   // This class explicitly does NOT store the active window in a window property
  55   // to make sure that ActivationChangeObserver is not treated as part of the
  56   // aura API. Assumptions to that end will cause tests that use this client to
  57   // fail.
  58   std::vector<aura::Window*> active_windows_;
  59
  60   // The window which was active before the currently active one.
  61   aura::Window* last_active_;
  62
  63   ObserverList<aura::client::ActivationChangeObserver> observers_;
  64
  65   DISALLOW_COPY_AND_ASSIGN(DefaultActivationClient);
  66 };
  67
  68 }  // namespace wm
  69
  70 #endif  // UI_WM_CORE_DEFAULT_ACTIVATION_CLIENT_H_