/* Copyright 2012 The Chromium Authors
* 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_Instance</code> structure - a series of
* pointers to methods that you must implement in your module.
*/
label Chrome {
M14 = 1.0,
M17 = 1.1
};
/**
* The <code>PPP_Instance</code> interface contains pointers to a series of
* functions that you must implement in your module. These functions can be
* trivial (simply return the default return value) unless you want your module
* to handle events such as change of focus or input events (keyboard/mouse)
* events.
*/
interface PPP_Instance {
/**
* DidCreate() is a creation handler that is called when a new instance is
* created. This function is called for each instantiation on the page,
* corresponding to one \<embed\> tag on the page.
*
* Generally you would handle this call by initializing the information
* your module associates with an instance and creating a mapping from the
* given <code>PP_Instance</code> handle to this data. The
* <code>PP_Instance</code> handle will be used in subsequent calls to
* identify which instance the call pertains to.
*
* It's possible for more than one instance to be created in a single module.
* This means that you may get more than one <code>OnCreate</code> without an
* <code>OnDestroy</code> in between, and should be prepared to maintain
* multiple states associated with each instance.
*
* If this function reports a failure (by returning <code>PP_FALSE</code>),
* the instance will be deleted.
*
* @param[in] instance A new <code>PP_Instance</code> identifying one
* instance of a module. This is an opaque handle.
*
* @param[in] argc The number of arguments contained in <code>argn</code>
* and <code>argv</code>.
*
* @param[in] argn An array of argument names. These argument names are
* supplied in the \<embed\> tag, for example:
* <code>\<embed id="nacl_module" dimensions="2"\></code> will produce two
* argument names: "id" and "dimensions."
*
* @param[in] argv An array of argument values. These are the values of the
* arguments listed in the \<embed\> tag, for example
* <code>\<embed id="nacl_module" dimensions="2"\></code> will produce two
* argument values: "nacl_module" and "2". The indices of these values match
* the indices of the corresponding names in <code>argn</code>.
*
* @return <code>PP_TRUE</code> on success or <code>PP_FALSE</code> on
* failure.
*/
PP_Bool DidCreate(
/* A PP_Instance identifying one instance of a module. */
[in] PP_Instance instance,
/* The number of arguments contained in argn and argv. */
[in] uint32_t argc,
/* An array of argument names. These argument names are
* supplied in the <embed> tag, for example:
* <embed id="nacl_module" dimensions="2"> will produce two argument
* names: "id" and "dimensions."
*/
[in, size_as=argc] str_t[] argn,
/* An array of argument values. These are the values of the
* arguments listed in the <embed> tag, for example
* <embed id="nacl_module" dimensions="2"> will produce two argument
* values: "nacl_module" and "2." The indices of these values match the
* indices of the corresponding names in argn.
*/
[in, size_as=argc] str_t[] argv);
/**
* DidDestroy() is an instance destruction handler. This function is called
* in many cases (see below) when a module instance is destroyed. It will be
* called even if DidCreate() returned failure.
*
* Generally you will handle this call by deallocating the tracking
* information and the <code>PP_Instance</code> mapping you created in the
* DidCreate() call. You can also free resources associated with this
* instance but this isn't required; all resources associated with the deleted
* instance will be automatically freed when this function returns.
*
* The instance identifier will still be valid during this call, so the module
* can perform cleanup-related tasks. Once this function returns, the
* <code>PP_Instance</code> handle will be invalid. This means that you can't
* do any asynchronous operations like network requests, file writes or
* messaging from this function since they will be immediately canceled.
*
* <strong>Note:</strong> This function will always be skipped on untrusted
* (Native Client) implementations. This function may be skipped on trusted
* implementations in certain circumstances when Chrome does "fast shutdown"
* of a web page. Fast shutdown will happen in some cases when all module
* instances are being deleted, and no cleanup functions will be called.
* The module will just be unloaded and the process terminated.
*
* @param[in] instance A <code>PP_Instance</code> identifying one instance
* of a module.
*/
void DidDestroy(
/* A PP_Instance identifying one instance of a module. */
[in] PP_Instance instance);
/**
* Deprecated in 1.1 in favor of the version that takes a Resource.
*
* DidChangeView() is called when the position, the size, of the clip
* rectangle of the element in the browser that corresponds to this
* instance has changed.
*
* A typical implementation will check the size of the <code>position</code>
* argument and reallocate the graphics context when a different size is
* received. Note that this function will be called for scroll events where
* the size doesn't change, so you should always check that the size is
* actually different before doing any reallocations.
*
* @param[in] instance A <code>PP_Instance</code> identifying the instance
* that has changed.
*
* @param[in] position The location on the page of the instance. This is
* relative to the top left corner of the viewport, which changes as the
* page is scrolled. Generally the size of this value will be used to create
* a graphics device, and the position is ignored (most things are relative
* to the instance so the absolute position isn't useful in most cases).
*
* @param[in] clip The visible region of the instance. This is relative to
* the top left of the module's coordinate system (not the page). If the
* module is invisible, <code>clip</code> will be (0, 0, 0, 0).
*
* It's recommended to check for invisible instances and to stop
* generating graphics updates in this case to save system resources. It's
* not usually worthwhile, however, to generate partial updates according to
* the clip when the instance is partially visible. Instead, update the entire
* region. The time saved doing partial paints is usually not significant and
* it can create artifacts when scrolling (this notification is sent
* asynchronously from scrolling so there can be flashes of old content in the
* exposed regions).
*/
void DidChangeView(
/* A PP_Instance identifying the instance whose view changed. */
[in] PP_Instance instance,
/* The new location on the page of this instance. This is relative to
* the top left corner of the viewport, which changes as the
* page is scrolled.
*/
[in] PP_Rect position,
/* The visible region of the NaCl module. This is relative to the top
* left of the plugin's coordinate system (not the page) If the plugin
* is invisible, clip will be (0, 0, 0, 0).
*/
[in] PP_Rect clip);
/**
* <code>DidChangeView() is called when the position, size, or other view
* attributes of the instance has changed.
*/
[version=1.1]
void DidChangeView(
/* A PP_Instance identifying the instance whose view changed. */
[in] PP_Instance instance,
/**
* A handle to a <code>PPB_View</code> resource identifying the new view.
*/
[in] PP_Resource view);
/**
* DidChangeFocus() is called when an instance has gained or lost focus.
* Having focus means that keyboard events will be sent to the instance.
* An instance's default condition is that it will not have focus.
*
* The focus flag takes into account both browser tab and window focus as
* well as focus of the plugin element on the page. In order to be deemed
* to have focus, the browser window must be topmost, the tab must be
* selected in the window, and the instance must be the focused element on
* the page.
*
* <strong>Note:</strong>Clicks on instances will give focus only if you
* handle the click event. Return <code>true</code> from
* <code>HandleInputEvent</code> in <code>PPP_InputEvent</code> (or use
* unfiltered events) to signal that the click event was handled. Otherwise,
* the browser will bubble the event and give focus to the element on the page
* that actually did end up consuming it. If you're not getting focus, check
* to make sure you're either requesting them via
* <code>RequestInputEvents()<code> (which implicitly marks all input events
* as consumed) or via <code>RequestFilteringInputEvents()</code> and
* returning true from your event handler.
*
* @param[in] instance A <code>PP_Instance</code> identifying the instance
* receiving the input event.
*
* @param[in] has_focus Indicates the new focused state of the instance.
*/
void DidChangeFocus(
/* A PP_Instance identifying one instance of a module. */
[in] PP_Instance instance,
/* Indicates whether this NaCl module gained or lost event focus. */
[in] PP_Bool has_focus);
/**
* HandleDocumentLoad() is called after initialize for a full-frame
* instance that was instantiated based on the MIME type of a DOMWindow
* navigation. This situation only applies to modules that are pre-registered
* to handle certain MIME types. If you haven't specifically registered to
* handle a MIME type or aren't positive this applies to you, your
* implementation of this function can just return <code>PP_FALSE</code>.
*
* The given <code>url_loader</code> corresponds to a
* <code>PPB_URLLoader</code> instance that is already opened. Its response
* headers may be queried using <code>PPB_URLLoader::GetResponseInfo</code>.
* The reference count for the URL loader is not incremented automatically on
* behalf of the module. You need to increment the reference count yourself
* if you are going to keep a reference to it.
*
* This method returns <code>PP_FALSE</code> if the module cannot handle the
* data. In response to this method, the module should call
* ReadResponseBody() to read the incoming data.
*
* @param[in] instance A <code>PP_Instance</code> identifying the instance
* that should do the load.
*
* @param[in] url_loader An open <code>PPB_URLLoader</code> instance.
*
* @return <code>PP_TRUE</code> if the data was handled,
* <code>PP_FALSE</code> otherwise. If you return false, the load will be
* canceled for you.
*/
PP_Bool HandleDocumentLoad(
/* A PP_Instance identifying one instance of a module. */
[in] PP_Instance instance,
/* A PP_Resource an open PPB_URLLoader instance. */
[in] PP_Resource url_loader);
};
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