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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 #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. | |
| 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 | |
| 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_ | |
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