blob: 98c746a6beb20bf97df7e13b9761365f95122a46 [file] [log] [blame]
// 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.
#include <stdint.h>
#include <memory>
#include <vector>
#include "base/callback_forward.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "content/common/content_export.h"
#include "ppapi/c/dev/ppb_device_ref_dev.h"
#include "ppapi/host/host_message_context.h"
#include "url/gurl.h"
namespace ppapi {
struct DeviceRefData;
namespace host {
class ResourceHost;
} // namespace ppapi
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 {
class Delegate {
virtual ~Delegate() {}
using DevicesCallback = base::Callback<void(
const std::vector<ppapi::DeviceRefData>& /* devices */)>;
// Enumerates devices of the specified type.
virtual void EnumerateDevices(PP_DeviceType_Dev type,
const DevicesCallback& callback) = 0;
// Starts monitoring devices of the specified |type|. Returns a
// subscription ID that must be used to stop monitoring for the device
// |type|. Does not invoke |callback| synchronously. |callback| is invoked
// when device changes of the specified |type| occur.
virtual size_t StartMonitoringDevices(PP_DeviceType_Dev type,
const DevicesCallback& callback) = 0;
// Stops monitoring devices of the specified |type|. The
// |subscription_id| is the return value of StartMonitoringDevices.
virtual void StopMonitoringDevices(PP_DeviceType_Dev type,
size_t subscription_id) = 0;
// |resource_host| and |delegate| must outlive this object.
PepperDeviceEnumerationHostHelper(ppapi::host::ResourceHost* resource_host,
base::WeakPtr<Delegate> delegate,
PP_DeviceType_Dev device_type,
const GURL& document_url);
// Returns true if the message has been handled.
bool HandleResourceMessage(const IPC::Message& msg,
ppapi::host::HostMessageContext* context,
int32_t* result);
class ScopedEnumerationRequest;
class ScopedMonitoringRequest;
// 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(
const std::vector<ppapi::DeviceRefData>& devices);
void OnNotifyDeviceChange(uint32_t callback_id,
const std::vector<ppapi::DeviceRefData>& devices);
// Non-owning pointers.
ppapi::host::ResourceHost* resource_host_;
base::WeakPtr<Delegate> delegate_;
PP_DeviceType_Dev device_type_;
std::unique_ptr<ScopedEnumerationRequest> enumerate_;
std::unique_ptr<ScopedMonitoringRequest> monitor_;
ppapi::host::ReplyMessageContext enumerate_devices_context_;
} // namespace content