/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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#include "nsISupports.idl"
#include "nsIPluginStreamListener.idl"

%{C++
#include "nsplugindefs.h"
%}

interface nsIPluginInstancePeer;

/**
 * The nsIPluginInstance interface is the minimum interface plugin developers
 * need to support in order to implement a plugin instance. The plugin manager
 * may QueryInterface for more specific types, e.g. nsILiveConnectPluginInstance. 
 *
 * (Corresponds to NPP object.)
 *
 * The old NPP_Destroy call has been factored into two plugin instance 
 * methods:
 *
 * Stop -- called when the plugin instance is to be stopped (e.g. by 
 * displaying another plugin manager window, causing the page containing 
 * the plugin to become removed from the display).
 *
 * Destroy -- called once, before the plugin instance peer is to be 
 * destroyed. This method is used to destroy the plugin instance.
 */
[uuid(ebe00f40-0199-11d2-815b-006008119d7a)]
interface nsIPluginInstance : nsISupports
{
    /**
     * Initializes a newly created plugin instance, passing to it the
     * plugin instance peer which it should use for all communication
     * back to the browser.
     * 
     * @param aPeer - the corresponding plugin instance peer
     * @result      - NS_OK if this operation was successful
     */
    void initialize(in nsIPluginInstancePeer aPeer);

    /**
     * Returns a reference back to the plugin instance peer. This method is
     * used whenever the browser needs to obtain the peer back from a plugin
     * instance. The implementation of this method should be sure to increment
     * the reference count on the peer by calling AddRef.
     *
     * @param aPeer - the resulting plugin instance peer
     * @result      - NS_OK if this operation was successful
     */
    readonly attribute nsIPluginInstancePeer peer;

    /**
     * Called to instruct the plugin instance to start. This will be
     * called after the plugin is first created and initialized, and
     * may be called after the plugin is stopped (via the Stop method)
     * if the plugin instance is returned to in the browser window's
     * history.
     *
     * @result - NS_OK if this operation was successful
     */
    void start();

    /**
     * Called to instruct the plugin instance to stop, thereby
     * suspending its state.  This method will be called whenever the
     * browser window goes on to display another page and the page
     * containing the plugin goes into the window's history list.
     *
     * @result - NS_OK if this operation was successful
     */
    void stop();

    /**
     * Called to instruct the plugin instance to destroy itself. This
     * is called when it become no longer possible to return to the
     * plugin instance, either because the browser window's history
     * list of pages is being trimmed, or because the window
     * containing this page in the history is being closed.
     *
     * @result - NS_OK if this operation was successful
     */
    void destroy();

    /**
     * Called when the window containing the plugin instance changes.
     *
     * (Corresponds to NPP_SetWindow.)
     *
     * @param aWindow - the plugin window structure
     * @result        - NS_OK if this operation was successful
     */
    void setWindow(in nsPluginWindowPtr aWindow);

    /**
     * Called to tell the plugin that the initial src/data stream is
	 * ready.  Expects the plugin to return a nsIPluginStreamListener.
     *
     * (Corresponds to NPP_NewStream.)
     *
     * @param aListener - listener the browser will use to give the plugin the data
     * @result          - NS_OK if this operation was successful
     */
    void newStream(out nsIPluginStreamListener aListener);

    /**
     * Called to instruct the plugin instance to print itself to a printer.
     *
     * (Corresponds to NPP_Print.)
     *
     * @param aPlatformPrint - platform-specific printing information
     * @result               - NS_OK if this operation was successful
     */
    void print(in nsPluginPrintPtr aPlatformPrint);

    /**
     * Returns the value of a variable associated with the plugin instance.
     *
     * @param aVariable - the plugin instance variable to get
     * @param aValue    - the address of where to store the resulting value
     * @result          - NS_OK if this operation was successful
     */
    void getValue(in nsPluginInstanceVariable aVariable, in voidPtr aValue);

    /**
     * Handles an event. An nsIEventHandler can also get registered with with
     * nsIPluginManager2::RegisterWindow and will be called whenever an event
     * comes in for that window.
     *
     * Note that for Unix and Mac the nsPluginEvent structure is different
     * from the old NPEvent structure -- it's no longer the native event
     * record, but is instead a struct. This was done for future extensibility,
     * and so that the Mac could receive the window argument too. For Windows
     * and OS2, it's always been a struct, so there's no change for them.
     *
     * (Corresponds to NPP_HandleEvent.)
     *
     * @param aEvent   - the event to be handled
     * @param aHandled - set to PR_TRUE if event was handled
     * @result - NS_OK if this operation was successful
     */
    void handleEvent(in nsPluginEventPtr aEvent, out boolean aHandled);
};
