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_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_CAPTURE_CLIENT_H_ 6 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_CAPTURE_CLIENT_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/views/views_export.h" 14 15 namespace aura { 16 class RootWindow; 17 } 18 19 namespace views { 20 21 // Desktop implementation of CaptureClient. There is one CaptureClient per 22 // DesktopNativeWidgetAura. 23 // 24 // DesktopCaptureClient and CaptureController (used by ash) differ slightly in 25 // how they handle capture. CaptureController is a singleton shared among all 26 // RootWindows created by ash. An implication of this is that all RootWindows 27 // know which window has capture. This is not the case with 28 // DesktopCaptureClient. Instead each RootWindow has its own 29 // DesktopCaptureClient. This means only the RootWindow of the Window that has 30 // capture knows which window has capture. All others think no one has 31 // capture. This behavior is necessitated by Windows occassionally delivering 32 // mouse events to a window other than the capture window and expecting that 33 // window to get the event. If we shared the capture window on the desktop this 34 // behavior would not be possible. 35 class VIEWS_EXPORT DesktopCaptureClient : public aura::client::CaptureClient { 36 public: 37 explicit DesktopCaptureClient(aura::Window* root); 38 virtual ~DesktopCaptureClient(); 39 40 // Overridden from aura::client::CaptureClient: 41 virtual void SetCapture(aura::Window* window) OVERRIDE; 42 virtual void ReleaseCapture(aura::Window* window) OVERRIDE; 43 virtual aura::Window* GetCaptureWindow() OVERRIDE; 44 virtual aura::Window* GetGlobalCaptureWindow() OVERRIDE; 45 46 private: 47 typedef std::set<DesktopCaptureClient*> CaptureClients; 48 49 aura::Window* root_; 50 aura::Window* capture_window_; 51 52 // Set of DesktopCaptureClients. 53 static CaptureClients* capture_clients_; 54 55 DISALLOW_COPY_AND_ASSIGN(DesktopCaptureClient); 56 }; 57 58 } // namespace views 59 60 #endif // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_CAPTURE_CLIENT_H_ 61
