// Copyright 2013 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_CAPTURE_CLIENT_H_ #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_CAPTURE_CLIENT_H_ #include <set> #include "base/basictypes.h" #include "base/compiler_specific.h" #include "ui/aura/client/capture_client.h" #include "ui/views/views_export.h" namespace aura { class RootWindow; } namespace views { // Desktop implementation of CaptureClient. There is one CaptureClient per // DesktopNativeWidgetAura. // // DesktopCaptureClient and CaptureController (used by ash) differ slightly in // how they handle capture. CaptureController is a singleton shared among all // RootWindows created by ash. An implication of this is that all RootWindows // know which window has capture. This is not the case with // DesktopCaptureClient. Instead each RootWindow has its own // DesktopCaptureClient. This means only the RootWindow of the Window that has // capture knows which window has capture. All others think no one has // capture. This behavior is necessitated by Windows occassionally delivering // mouse events to a window other than the capture window and expecting that // window to get the event. If we shared the capture window on the desktop this // behavior would not be possible. class VIEWS_EXPORT DesktopCaptureClient : public aura::client::CaptureClient { public: explicit DesktopCaptureClient(aura::Window* root); virtual ~DesktopCaptureClient(); // Overridden from aura::client::CaptureClient: virtual void SetCapture(aura::Window* window) OVERRIDE; virtual void ReleaseCapture(aura::Window* window) OVERRIDE; virtual aura::Window* GetCaptureWindow() OVERRIDE; virtual aura::Window* GetGlobalCaptureWindow() OVERRIDE; private: typedef std::set<DesktopCaptureClient*> CaptureClients; aura::Window* root_; aura::Window* capture_window_; // Set of DesktopCaptureClients. static CaptureClients* capture_clients_; DISALLOW_COPY_AND_ASSIGN(DesktopCaptureClient); }; } // namespace views #endif // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_CAPTURE_CLIENT_H_