1 // Copyright 2019 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 CHROME_BROWSER_MEDIA_WEBRTC_DESKTOP_MEDIA_PICKER_MANAGER_H_ 6 #define CHROME_BROWSER_MEDIA_WEBRTC_DESKTOP_MEDIA_PICKER_MANAGER_H_ 7 8 #include "base/macros.h" 9 #include "base/observer_list.h" 10 11 namespace base { 12 template <typename T> 13 class NoDestructor; 14 } 15 16 // A singleton that acts as a rendezvous for dialog observers to register and 17 // the dialog managers/delegates to post their activities. 18 // TODO(crbug/953495): Merge this into DesktopMediaPickerFactoryImpl. 19 class DesktopMediaPickerManager { 20 public: 21 class DialogObserver : public base::CheckedObserver { 22 public: 23 // Called when a media dialog is opened/shown. 24 virtual void OnDialogOpened() = 0; 25 26 // Called when a media dialog is closed/hidden. 27 virtual void OnDialogClosed() = 0; 28 }; 29 30 static DesktopMediaPickerManager* Get(); 31 32 // For the observers 33 void AddObserver(DialogObserver* observer); 34 void RemoveObserver(DialogObserver* observer); 35 36 // For the notifiers 37 void OnShowDialog(); 38 void OnHideDialog(); 39 40 private: 41 friend base::NoDestructor<DesktopMediaPickerManager>; 42 43 DesktopMediaPickerManager(); 44 ~DesktopMediaPickerManager(); // Never called. 45 46 base::ObserverList<DesktopMediaPickerManager::DialogObserver> observers_; 47 48 DISALLOW_COPY_AND_ASSIGN(DesktopMediaPickerManager); 49 }; 50 51 #endif // CHROME_BROWSER_MEDIA_WEBRTC_DESKTOP_MEDIA_PICKER_MANAGER_H_ 52