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// Copyright (c) 2012 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 CONTENT_RENDERER_PEPPER_PEPPER_DEVICE_ENUMERATION_HOST_HELPER_H_
#define CONTENT_RENDERER_PEPPER_PEPPER_DEVICE_ENUMERATION_HOST_HELPER_H_
#include <vector>
#include "base/basictypes.h"
#include "base/callback_forward.h"
#include "base/memory/scoped_ptr.h"
#include "content/common/content_export.h"
#include "ppapi/c/dev/ppb_device_ref_dev.h"
#include "url/gurl.h"
namespace ppapi {
struct DeviceRefData;
namespace host {
struct HostMessageContext;
struct ReplyMessageContext;
class ResourceHost;
}
}
namespace IPC {
class Message;
}
namespace content {
// Resource hosts that support device enumeration can use this class to filter
// and process PpapiHostMsg_DeviceEnumeration_* messages.
// TODO(yzshen): Refactor ppapi::host::ResourceMessageFilter to support message
// handling on the same thread, and then derive this class from the filter
// class.
class CONTENT_EXPORT PepperDeviceEnumerationHostHelper {
public:
class Delegate {
public:
virtual ~Delegate() {}
typedef base::Callback<
void (int /* request_id */,
const std::vector<ppapi::DeviceRefData>& /* devices */)>
EnumerateDevicesCallback;
// Enumerates devices of the specified type. The request ID passed into the
// callback will be the same as the return value.
virtual int EnumerateDevices(PP_DeviceType_Dev type,
const GURL& document_url,
const EnumerateDevicesCallback& callback) = 0;
// Stop enumerating devices of the specified |request_id|. The |request_id|
// is the return value of EnumerateDevicesCallback.
virtual void StopEnumerateDevices(int request_id) = 0;
};
// |resource_host| and |delegate| must outlive this object.
PepperDeviceEnumerationHostHelper(ppapi::host::ResourceHost* resource_host,
Delegate* delegate,
PP_DeviceType_Dev device_type,
const GURL& document_url);
~PepperDeviceEnumerationHostHelper();
// Returns true if the message has been handled.
bool HandleResourceMessage(const IPC::Message& msg,
ppapi::host::HostMessageContext* context,
int32_t* result);
private:
class ScopedRequest;
// Has a different signature than HandleResourceMessage() in order to utilize
// message dispatching macros.
int32_t InternalHandleResourceMessage(
const IPC::Message& msg,
ppapi::host::HostMessageContext* context,
bool* handled);
int32_t OnEnumerateDevices(ppapi::host::HostMessageContext* context);
int32_t OnMonitorDeviceChange(ppapi::host::HostMessageContext* context,
uint32_t callback_id);
int32_t OnStopMonitoringDeviceChange(
ppapi::host::HostMessageContext* context);
void OnEnumerateDevicesComplete(
int request_id,
const std::vector<ppapi::DeviceRefData>& devices);
void OnNotifyDeviceChange(
uint32_t callback_id,
int request_id,
const std::vector<ppapi::DeviceRefData>& devices);
// Non-owning pointers.
ppapi::host::ResourceHost* resource_host_;
Delegate* delegate_;
PP_DeviceType_Dev device_type_;
GURL document_url_;
scoped_ptr<ScopedRequest> enumerate_;
scoped_ptr<ScopedRequest> monitor_;
scoped_ptr<ppapi::host::ReplyMessageContext> enumerate_devices_context_;
DISALLOW_COPY_AND_ASSIGN(PepperDeviceEnumerationHostHelper);
};
} // namespace content
#endif // CONTENT_RENDERER_PEPPER_PEPPER_DEVICE_ENUMERATION_HOST_HELPER_H_
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