blob: 1abf5ab5b900ed58f7105eb31b788ddcaba406b4 [file] [log] [blame]
/* 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.
*/
/* From ppp_input_event.idl modified Wed Aug 17 11:16:34 2011. */
#ifndef PPAPI_C_PPP_INPUT_EVENT_H_
#define PPAPI_C_PPP_INPUT_EVENT_H_
#include "ppapi/c/pp_bool.h"
#include "ppapi/c/pp_instance.h"
#include "ppapi/c/pp_macros.h"
#include "ppapi/c/pp_resource.h"
#include "ppapi/c/pp_stdint.h"
#define PPP_INPUT_EVENT_INTERFACE_0_1 "PPP_InputEvent;0.1"
#define PPP_INPUT_EVENT_INTERFACE PPP_INPUT_EVENT_INTERFACE_0_1
/**
* @file
* This file defines the API for receiving input events from the browser.
*/
/**
* @addtogroup Interfaces
* @{
*/
struct PPP_InputEvent {
/**
* Function for receiving input events from the browser.
*
* In order to receive input events, you must register for them by calling
* PPB_InputEvent.RequestInputEvents() or RequestFilteringInputEvents(). By
* default, no events are delivered.
*
* If the event was handled, it will not be forwarded to the web page or
* browser. If it was not handled, it will bubble according to the normal
* rules. So it is important that an instance respond accurately with whether
* event propagation should continue.
*
* Event propagation also controls focus. If you handle an event like a mouse
* event, typically the instance will be given focus. Returning false from
* a filtered event handler or not registering for an event type means that
* the click will be given to a lower part of the page and your instance will
* not receive focus. This allows an instance to be partially transparent,
* where clicks on the transparent areas will behave like clicks to the
* underlying page.
*
* In general, you should try to keep input event handling short. Especially
* for filtered input events, the browser or page may be blocked waiting for
* you to respond.
*
* The caller of this function will maintain a reference to the input event
* resource during this call. Unless you take a reference to the resource
* to hold it for later, you don't need to release it.
*
* <strong>Note:</strong> If you're not receiving input events, make sure you
* register for the event classes you want by calling RequestInputEvents or
* RequestFilteringInputEvents. If you're still not receiving keyboard input
* events, make sure you're returning true (or using a non-filtered event
* handler) for mouse events. Otherwise, the instance will not receive focus
* and keyboard events will not be sent.
*
* \see PPB_InputEvent.ReqeustInputEvents and
* PPB_InputEvent.RequestFilteringInputEvents
*
* @return PP_TRUE if the event was handled, PP_FALSE if not. If you have
* registered to filter this class of events by calling
* RequestFilteringInputEvents, and you return PP_FALSE, the event will
* be forwarded to the page (and eventually the browser) for the default
* handling. For non-filtered events, the return value will be ignored.
*/
PP_Bool (*HandleInputEvent)(PP_Instance instance, PP_Resource input_event);
};
/**
* @}
*/
#endif /* PPAPI_C_PPP_INPUT_EVENT_H_ */