| // 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 CHROME_BROWSER_EXTENSIONS_API_SYSTEM_DISPLAY_DISPLAY_INFO_PROVIDER_H_ |
| #define CHROME_BROWSER_EXTENSIONS_API_SYSTEM_DISPLAY_DISPLAY_INFO_PROVIDER_H_ |
| |
| #include <string> |
| |
| #include "base/lazy_instance.h" |
| #include "chrome/browser/extensions/api/system_info/system_info_provider.h" |
| #include "chrome/common/extensions/api/system_display.h" |
| |
| namespace extensions { |
| |
| typedef std::vector<linked_ptr< |
| api::system_display::DisplayUnitInfo> > DisplayInfo; |
| |
| class DisplayInfoProvider : public SystemInfoProvider { |
| public: |
| typedef base::Callback<void(bool success)> |
| RequestInfoCallback; |
| typedef base::Callback<void(bool success, const std::string& error)> |
| SetInfoCallback; |
| |
| // Gets a DisplayInfoProvider instance. |
| static DisplayInfoProvider* Get(); |
| |
| // Starts request for the display info, redirecting the request to a worker |
| // thread if needed (using SystemInfoProvider<DisplayInfo>::StartQuery()). |
| // The callback will be called asynchronously. |
| // The implementation is platform specific. |
| void RequestInfo(const RequestInfoCallback& callback); |
| |
| // Updates the display parameters for a display with the provided id. |
| // The parameters are updated according to content of |info|. After the |
| // display is updated, callback is called with the success status, and error |
| // message. If the method succeeds, the error message is empty. |
| // The callback will be called asynchronously. |
| // This functionality is exposed only on ChromeOS. |
| virtual void SetInfo( |
| const std::string& display_id, |
| const api::system_display::DisplayProperties& info, |
| const SetInfoCallback& callback); |
| |
| const DisplayInfo& display_info() const; |
| |
| static void InitializeForTesting(scoped_refptr<DisplayInfoProvider> provider); |
| |
| protected: |
| DisplayInfoProvider(); |
| virtual ~DisplayInfoProvider(); |
| |
| // The last information filled up by QueryInfo and is accessed on multiple |
| // threads, but the whole class is being guarded by SystemInfoProvider base |
| // class. |
| // |
| // |info_| is accessed on the UI thread while |is_waiting_for_completion_| is |
| // false and on the sequenced worker pool while |is_waiting_for_completion_| |
| // is true. |
| DisplayInfo info_; |
| |
| private: |
| // Overriden from SystemInfoProvider. |
| // The implementation is platform specific. |
| virtual bool QueryInfo() OVERRIDE; |
| |
| static base::LazyInstance<scoped_refptr<DisplayInfoProvider> > provider_; |
| |
| DISALLOW_COPY_AND_ASSIGN(DisplayInfoProvider); |
| }; |
| |
| } // namespace extensions |
| |
| #endif // CHROME_BROWSER_EXTENSIONS_API_SYSTEM_DISPLAY_DISPLAY_INFO_PROVIDER_H_ |