blob: 97285c2842050d3f5877f26e904ad71a9cf7213b [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.
* This file defines the API for receiving input events from the browser.
label Chrome {
M14 = 0.1
[version=0.1, macro="PPP_INPUT_EVENT_INTERFACE"]
interface 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 default handlers
* in the web page. If it was not handled, it may be dispatched to a default
* handler. 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.RequestInputEvents 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([in] PP_Instance instance,
[in] PP_Resource input_event);