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// 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 gfx {
class Display;
}
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;
// Update the content of the |unit| obtained for |display| using
// platform specific method.
void UpdateDisplayUnitInfoForPlatform(
const gfx::Display& display,
extensions::api::system_display::DisplayUnitInfo* unit);
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_
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