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_change_observer.h"
  15 #include "ui/wm/public/activation_client.h"
  16 #include "ui/wm/wm_export.h"
  17
  18 namespace aura {
  19 namespace client {
  20 class ActivationChangeObserver;
  21 }
  22 }
  23
  24 namespace wm {
  25
  26 // Simple ActivationClient implementation for use by tests and other targets
  27 // that just need basic behavior (e.g. activate windows whenever requested,
  28 // restack windows at the top when they're activated, etc.). This object deletes
  29 // itself when the root window it is associated with is destroyed.
  30 class WM_EXPORT DefaultActivationClient : public aura::client::ActivationClient,
  31                                           public aura::WindowObserver {
  32  public:
  33   explicit DefaultActivationClient(aura::Window* root_window);
  34
  35   // Overridden from aura::client::ActivationClient:
  36   void AddObserver(aura::client::ActivationChangeObserver* observer) override;
  37   void RemoveObserver(
  38       aura::client::ActivationChangeObserver* observer) override;
  39   void ActivateWindow(aura::Window* window) override;
  40   void DeactivateWindow(aura::Window* window) override;
  41   aura::Window* GetActiveWindow() override;
  42   aura::Window* GetActivatableWindow(aura::Window* window) override;
  43   aura::Window* GetToplevelWindow(aura::Window* window) override;
  44   bool CanActivateWindow(aura::Window* window) const override;
  45
  46   // Overridden from WindowObserver:
  47   void OnWindowDestroyed(aura::Window* window) override;
  48
  49  private:
  50   class Deleter;
  51
  52   ~DefaultActivationClient() override;
  53   void RemoveActiveWindow(aura::Window* window);
  54
  55   void ActivateWindowImpl(
  56       aura::client::ActivationChangeObserver::ActivationReason reason,
  57       aura::Window* window);
  58
  59   // This class explicitly does NOT store the active window in a window property
  60   // to make sure that ActivationChangeObserver is not treated as part of the
  61   // aura API. Assumptions to that end will cause tests that use this client to
  62   // fail.
  63   std::vector<aura::Window*> active_windows_;
  64
  65   // The window which was active before the currently active one.
  66   aura::Window* last_active_;
  67
  68   base::ObserverList<aura::client::ActivationChangeObserver> observers_;
  69
  70   DISALLOW_COPY_AND_ASSIGN(DefaultActivationClient);
  71 };
  72
  73 }  // namespace wm
  74
  75 #endif  // UI_WM_CORE_DEFAULT_ACTIVATION_CLIENT_H_