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/* Copyright 2014 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.
*/
/**
* This file defines the <code>PPP_MessageHandler</code> interface that plugins
* can implement and register using PPB_Messaging::RegisterMessageHandler in
* order to handle messages sent from JavaScript via postMessage() or
* postMessageAndAwaitResponse().
*/
label Chrome {
M39 = 0.2
};
/**
* The <code>PPP_MessageHandler</code> interface is implemented by the plugin
* if the plugin wants to receive messages from a thread other than the main
* Pepper thread, or if the plugin wants to handle blocking messages which
* JavaScript may send via postMessageAndAwaitResponse().
*
* This interface struct should not be returned by PPP_GetInterface; instead it
* must be passed as a parameter to PPB_Messaging::RegisterMessageHandler.
*/
[no_interface_string]
interface PPP_MessageHandler {
/**
* Invoked as a result of JavaScript invoking postMessage() on the plugin's
* DOM element.
*
* @param[in] instance A <code>PP_Instance</code> identifying one instance
* of a module.
* @param[in] user_data is the same pointer which was provided by a call to
* RegisterMessageHandler().
* @param[in] message A copy of the parameter that JavaScript provided to
* postMessage().
*/
void HandleMessage([in] PP_Instance instance,
[inout] mem_t user_data,
[constptr_in] PP_Var message);
/**
* Invoked as a result of JavaScript invoking postMessageAndAwaitResponse()
* on the plugin's DOM element.
*
* NOTE: JavaScript execution is blocked during the duration of this call.
* Hence, the plugin should respond as quickly as possible. For this reason,
* blocking completion callbacks are disallowed while handling a blocking
* message.
*
* @param[in] instance A <code>PP_Instance</code> identifying one instance
* of a module.
* @param[in] user_data is the same pointer which was provided by a call to
* RegisterMessageHandler().
* @param[in] message is a copy of the parameter that JavaScript provided
* to postMessageAndAwaitResponse().
* @param[out] response will be copied to a JavaScript object which is
* returned as the result of postMessageAndAwaitResponse() to the invoking
JavaScript.
*/
void HandleBlockingMessage([in] PP_Instance instance,
[inout] mem_t user_data,
[constptr_in] PP_Var message,
[out] PP_Var response);
/**
* Invoked when the handler object is no longer needed. After this, no more
* calls will be made which pass this same value for <code>instance</code>
* and <code>user_data</code>.
*
* @param[in] instance A <code>PP_Instance</code> identifying one instance
* of a module.
* @param[in] user_data is the same pointer which was provided by a call to
* RegisterMessageHandler.
*/
void Destroy([in] PP_Instance instance, [inout] mem_t user_data);
};
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