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_VIEWS_COREWM_CAPTURE_CONTROLLER_H_ 6 #define UI_VIEWS_COREWM_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/views/views_export.h" 15 16 namespace views { 17 namespace corewm { 18 19 // Internal CaptureClient implementation. See ScopedCaptureClient for details. 20 class VIEWS_EXPORT CaptureController : public aura::client::CaptureClient { 21 public: 22 // Adds |root| to the list of RootWindows notified when capture changes. 23 void Attach(aura::Window* root); 24 25 // Removes |root| from the list of RootWindows notified when capture changes. 26 void Detach(aura::Window* root); 27 28 // Returns true if this CaptureController is installed on at least one 29 // RootWindow. is_active()30 bool is_active() const { return !root_windows_.empty(); } 31 32 // Overridden from aura::client::CaptureClient: 33 virtual void SetCapture(aura::Window* window) OVERRIDE; 34 virtual void ReleaseCapture(aura::Window* window) OVERRIDE; 35 virtual aura::Window* GetCaptureWindow() OVERRIDE; 36 virtual aura::Window* GetGlobalCaptureWindow() OVERRIDE; 37 38 private: 39 friend class ScopedCaptureClient; 40 typedef std::set<aura::Window*> RootWindows; 41 42 CaptureController(); 43 virtual ~CaptureController(); 44 45 // The current capture window. NULL if there is no capture window. 46 aura::Window* capture_window_; 47 48 // Set of RootWindows notified when capture changes. 49 RootWindows root_windows_; 50 51 DISALLOW_COPY_AND_ASSIGN(CaptureController); 52 }; 53 54 // ScopedCaptureClient is responsible for creating a CaptureClient for a 55 // RootWindow. Specifically it creates a single CaptureController that is shared 56 // among all ScopedCaptureClients and adds the RootWindow to it. 57 class VIEWS_EXPORT ScopedCaptureClient : public aura::WindowObserver { 58 public: 59 explicit ScopedCaptureClient(aura::Window* root); 60 virtual ~ScopedCaptureClient(); 61 62 // Returns true if there is a CaptureController with at least one RootWindow. 63 static bool IsActive(); 64 capture_client()65 aura::client::CaptureClient* capture_client() { 66 return capture_controller_; 67 } 68 69 // Overridden from aura::WindowObserver: 70 virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE; 71 72 private: 73 // Invoked from destructor and OnWindowDestroyed() to cleanup. 74 void Shutdown(); 75 76 // The single CaptureController instance. 77 static CaptureController* capture_controller_; 78 79 // RootWindow this ScopedCaptureClient was create for. 80 aura::Window* root_window_; 81 82 DISALLOW_COPY_AND_ASSIGN(ScopedCaptureClient); 83 }; 84 85 } // namespace corewm 86 } // namespace views 87 88 #endif // UI_VIEWS_COREWM_CAPTURE_CONTROLLER_H_ 89