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 CHROME_BROWSER_EXTENSIONS_API_SYSTEM_DISPLAY_DISPLAY_INFO_PROVIDER_H_ 6 #define CHROME_BROWSER_EXTENSIONS_API_SYSTEM_DISPLAY_DISPLAY_INFO_PROVIDER_H_ 7 8 #include <string> 9 10 #include "base/lazy_instance.h" 11 #include "chrome/browser/extensions/api/system_info/system_info_provider.h" 12 #include "chrome/common/extensions/api/system_display.h" 13 14 namespace extensions { 15 16 typedef std::vector<linked_ptr< 17 api::system_display::DisplayUnitInfo> > DisplayInfo; 18 19 class DisplayInfoProvider : public SystemInfoProvider { 20 public: 21 typedef base::Callback<void(bool success)> 22 RequestInfoCallback; 23 typedef base::Callback<void(bool success, const std::string& error)> 24 SetInfoCallback; 25 26 // Gets a DisplayInfoProvider instance. 27 static DisplayInfoProvider* Get(); 28 29 // Starts request for the display info, redirecting the request to a worker 30 // thread if needed (using SystemInfoProvider<DisplayInfo>::StartQuery()). 31 // The callback will be called asynchronously. 32 // The implementation is platform specific. 33 void RequestInfo(const RequestInfoCallback& callback); 34 35 // Updates the display parameters for a display with the provided id. 36 // The parameters are updated according to content of |info|. After the 37 // display is updated, callback is called with the success status, and error 38 // message. If the method succeeds, the error message is empty. 39 // The callback will be called asynchronously. 40 // This functionality is exposed only on ChromeOS. 41 virtual void SetInfo( 42 const std::string& display_id, 43 const api::system_display::DisplayProperties& info, 44 const SetInfoCallback& callback); 45 46 const DisplayInfo& display_info() const; 47 48 static void InitializeForTesting(scoped_refptr<DisplayInfoProvider> provider); 49 50 protected: 51 DisplayInfoProvider(); 52 virtual ~DisplayInfoProvider(); 53 54 // The last information filled up by QueryInfo and is accessed on multiple 55 // threads, but the whole class is being guarded by SystemInfoProvider base 56 // class. 57 // 58 // |info_| is accessed on the UI thread while |is_waiting_for_completion_| is 59 // false and on the sequenced worker pool while |is_waiting_for_completion_| 60 // is true. 61 DisplayInfo info_; 62 63 private: 64 // Overriden from SystemInfoProvider. 65 // The implementation is platform specific. 66 virtual bool QueryInfo() OVERRIDE; 67 68 static base::LazyInstance<scoped_refptr<DisplayInfoProvider> > provider_; 69 70 DISALLOW_COPY_AND_ASSIGN(DisplayInfoProvider); 71 }; 72 73 } // namespace extensions 74 75 #endif // CHROME_BROWSER_EXTENSIONS_API_SYSTEM_DISPLAY_DISPLAY_INFO_PROVIDER_H_ 76
