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/* Copyright (c) 2011 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 PPAPI_C_PPB_MESSAGING_H_
#define PPAPI_C_PPB_MESSAGING_H_
#include "ppapi/c/pp_instance.h"
#include "ppapi/c/pp_var.h"
#define PPB_MESSAGING_INTERFACE_0_1 "PPB_Messaging;0.1"
#define PPB_MESSAGING_INTERFACE_1_0 "PPB_Messaging;1.0"
#define PPB_MESSAGING_INTERFACE PPB_MESSAGING_INTERFACE_1_0
/**
* @file
* This file defines the <code>PPB_Messaging</code> interface implemented
* by the browser for sending messages to DOM elements associated with a
* specific module instance.
*
* @addtogroup Interfaces
* @{
*/
/**
* The <code>PPB_Messaging</code> interface is implemented by the browser
* and is related to sending messages to JavaScript message event listeners on
* the DOM element associated with specific module instance.
*/
struct PPB_Messaging {
/**
* PostMessage() asynchronously invokes any listeners for message events on
* the DOM element for the given module instance. A call to PostMessage()
* will not block while the message is processed.
*
* @param[in] instance A <code>PP_Instance</code> indentifying one instance
* of a module.
* @param[in] message A <code>PP_Var</code> containing the data to be sent to
* JavaScript.
* Message can have a numeric, boolean, or string value; arrays and
* dictionaries are not yet supported. Ref-counted var types are copied, and
* are therefore not shared between the module instance and the browser.
*
* Listeners for message events in JavaScript code will receive an object
* conforming to the HTML 5 <code>MessageEvent</code> interface.
* Specifically, the value of message will be contained as a property called
* data in the received <code>MessageEvent</code>.
*
* This messaging system is similar to the system used for listening for
* messages from Web Workers. Refer to
* <code>http://www.whatwg.org/specs/web-workers/current-work/</code> for
* further information.
*
* <strong>Example:</strong>
*
* @code
*
* <body>
* <object id="plugin"
* type="application/x-ppapi-postMessage-example"/>
* <script type="text/javascript">
* var plugin = document.getElementById('plugin');
* plugin.AddEventListener("message",
* function(message) { alert(message.data); },
* false);
* </script>
* </body>
*
* @endcode
*
* The module instance then invokes PostMessage() as follows:
*
* @code
*
*
* char hello_world[] = "Hello world!";
* PP_Var hello_var = ppb_var_interface->VarFromUtf8(instance,
* hello_world,
* sizeof(hello_world));
* ppb_messaging_interface->PostMessage(instance, hello_var); // Copies var.
* ppb_var_interface->Release(hello_var);
*
* @endcode
*
* The browser will pop-up an alert saying "Hello world!"
*/
void (*PostMessage)(PP_Instance instance, struct PP_Var message);
};
/**
* @}
*/
#endif /* PPAPI_C_PPB_MESSAGING_H_ */
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