| // Copyright 2021 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 REMOTING_HOST_DESKTOP_DISPLAY_INFO_MONITOR_H_ |
| #define REMOTING_HOST_DESKTOP_DISPLAY_INFO_MONITOR_H_ |
| |
| #include <memory> |
| |
| #include "base/memory/scoped_refptr.h" |
| #include "base/memory/weak_ptr.h" |
| #include "base/sequence_checker.h" |
| #include "base/timer/timer.h" |
| #include "remoting/host/desktop_display_info.h" |
| #include "remoting/host/desktop_display_info_loader.h" |
| |
| namespace base { |
| class SequencedTaskRunner; |
| } // namespace base |
| |
| namespace remoting { |
| |
| class ClientSessionControl; |
| |
| // This class regularly queries the OS for any changes to the multi-monitor |
| // display configuration, and reports any changes to the ClientSession. |
| // This class ensures that the DisplayInfo is fetched on the UI thread, which |
| // may be different from the calling thread. This is helpful on platforms where |
| // REMOTING_MULTI_PROCESS == false, allowing this class to be used on the |
| // network thread. When REMOTING_MULTI_PROCESS == true, this instance lives in |
| // the Desktop process. |
| class DesktopDisplayInfoMonitor { |
| public: |
| DesktopDisplayInfoMonitor( |
| scoped_refptr<base::SequencedTaskRunner> ui_task_runner, |
| base::WeakPtr<ClientSessionControl> client_session_control); |
| |
| DesktopDisplayInfoMonitor(const DesktopDisplayInfoMonitor&) = delete; |
| DesktopDisplayInfoMonitor& operator=(const DesktopDisplayInfoMonitor&) = |
| delete; |
| |
| virtual ~DesktopDisplayInfoMonitor(); |
| |
| // Begins continuous monitoring for changes. Any changes to the monitor layout |
| // will be reported to the ClientSessionControl. |
| void Start(); |
| |
| // Queries the OS immediately for the current monitor layout and reports any |
| // changed display info to the ClientSessionControl. If this instance is |
| // associated with a DesktopCapturerProxy, this method could be used to |
| // query the display info on each captured frame. |
| void QueryDisplayInfo(); |
| |
| private: |
| void OnDisplayInfoLoaded(DesktopDisplayInfo info); |
| |
| SEQUENCE_CHECKER(sequence_checker_); |
| |
| scoped_refptr<base::SequencedTaskRunner> ui_task_runner_; |
| |
| // Object which receives DesktopDisplayInfo updates. |
| base::WeakPtr<ClientSessionControl> client_session_control_ |
| GUARDED_BY_CONTEXT(sequence_checker_); |
| |
| // Contains the most recently gathered info about the desktop displays. |
| DesktopDisplayInfo desktop_display_info_ |
| GUARDED_BY_CONTEXT(sequence_checker_); |
| |
| // Created on the calling thread, but accessed and destroyed on the UI thread. |
| std::unique_ptr<DesktopDisplayInfoLoader> desktop_display_info_loader_; |
| |
| // Timer to regularly poll |desktop_display_info_loader_| for updates. |
| base::RepeatingTimer timer_ GUARDED_BY_CONTEXT(sequence_checker_); |
| |
| base::WeakPtrFactory<DesktopDisplayInfoMonitor> weak_factory_{this}; |
| }; |
| |
| } // namespace remoting |
| |
| #endif // REMOTING_HOST_DESKTOP_DISPLAY_INFO_MONITOR_H_ |