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 #ifndef UI_WM_CORE_CAPTURE_CONTROLLER_H_ 6 #define UI_WM_CORE_CAPTURE_CONTROLLER_H_ 7 8 #include <set> 9 10 #include "base/basictypes.h" 11 #include "base/compiler_specific.h" 12 #include "ui/aura/client/capture_client.h" 13 #include "ui/aura/window_observer.h" 14 #include "ui/wm/wm_export.h" 15 16 namespace wm { 17 18 // Internal CaptureClient implementation. See ScopedCaptureClient for details. 19 class WM_EXPORT CaptureController : public aura::client::CaptureClient { 20 public: 21 // Adds |root| to the list of RootWindows notified when capture changes. 22 void Attach(aura::Window* root); 23 24 // Removes |root| from the list of RootWindows notified when capture changes. 25 void Detach(aura::Window* root); 26 27 // Returns true if this CaptureController is installed on at least one 28 // RootWindow. is_active()29 bool is_active() const { return !root_windows_.empty(); } 30 31 // Overridden from aura::client::CaptureClient: 32 virtual void SetCapture(aura::Window* window) OVERRIDE; 33 virtual void ReleaseCapture(aura::Window* window) OVERRIDE; 34 virtual aura::Window* GetCaptureWindow() OVERRIDE; 35 virtual aura::Window* GetGlobalCaptureWindow() OVERRIDE; 36 37 private: 38 friend class ScopedCaptureClient; 39 typedef std::set<aura::Window*> RootWindows; 40 41 CaptureController(); 42 virtual ~CaptureController(); 43 44 // The current capture window. NULL if there is no capture window. 45 aura::Window* capture_window_; 46 47 // Set of RootWindows notified when capture changes. 48 RootWindows root_windows_; 49 50 DISALLOW_COPY_AND_ASSIGN(CaptureController); 51 }; 52 53 // ScopedCaptureClient is responsible for creating a CaptureClient for a 54 // RootWindow. Specifically it creates a single CaptureController that is shared 55 // among all ScopedCaptureClients and adds the RootWindow to it. 56 class WM_EXPORT ScopedCaptureClient : public aura::WindowObserver { 57 public: 58 explicit ScopedCaptureClient(aura::Window* root); 59 virtual ~ScopedCaptureClient(); 60 61 // Returns true if there is a CaptureController with at least one RootWindow. 62 static bool IsActive(); 63 capture_client()64 aura::client::CaptureClient* capture_client() { 65 return capture_controller_; 66 } 67 68 // Overridden from aura::WindowObserver: 69 virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE; 70 71 private: 72 // Invoked from destructor and OnWindowDestroyed() to cleanup. 73 void Shutdown(); 74 75 // The single CaptureController instance. 76 static CaptureController* capture_controller_; 77 78 // RootWindow this ScopedCaptureClient was create for. 79 aura::Window* root_window_; 80 81 DISALLOW_COPY_AND_ASSIGN(ScopedCaptureClient); 82 }; 83 84 } // namespace wm 85 86 #endif // UI_WM_CORE_CAPTURE_CONTROLLER_H_ 87