//////////

//

//  File:       VRActions.c

//

//  Contains:   Support for reacting to QuickTime wired actions in VR nodes.

//

//  Written by: Tim Monroe

//

//  Copyright:  © 1999 by Apple Computer, Inc., all rights reserved.

//

//  Change History (most recent first):

//

//     <1>      08/05/99    rtm     first file

//     

//  This code supports intercepting and reacting to wired actions in QuickTime VR movies.

//  Currently, we support two kinds of wired actions: (1) wired actions triggered by sprite

//  actions and (2) wired actions triggered by VR-specific actions (namely, entering a node

//  and interacting with hot spots). 

//

//////////

// header files

#include "VRActions.h"

//////////

//

// VRActions_InitWindowData

// Initialize window-specific data for wired actions.

//

//////////

void VRActions_InitWindowData (WindowObject theWindowObject)

{

    ApplicationDataHdl  myAppData = NULL;

    Track               myTrack = NULL;

    short               myCount = 0;

    QTAtomContainer     myContainer = NULL;

    QTAtom              myAtom = 0;

    OSErr               myErr = noErr;

    myAppData = (ApplicationDataHdl)QTFrame_GetAppDataFromWindowObject(theWindowObject);

    if (myAppData != NULL) {

        // assume that the movie has no wired actions of any kind

        (**myAppData).fMovieHasActions = false;

        //////////

        //

        // look for any QTVR- or sprite-specific wired actions

        //

        //////////

        // loop thru all sprite tracks in the VR movie file; 

        // **but the first time thru the loop, the track is the QTVR track**

        myCount = 0;

        myTrack = GetMovieIndTrackType((**theWindowObject).fMovie, 1, kQTVRQTVRType, movieTrackMediaType);

        while (myTrack != NULL) {

            // see if this track has any wired actions; we do this by looking for 

            // an atom of type kSpriteTrackPropertyHasActions in the media property atom

            myErr = QTNewAtomContainer(&myContainer);

            if (myErr != noErr)

                goto bail;

            myErr = GetMediaPropertyAtom(GetTrackMedia(myTrack), &myContainer);

            if (myErr != noErr)

                goto bail;

            // find a child of type kSpriteTrackPropertyHasActions and with ID 1

            myAtom = QTFindChildByIndex(myContainer, kParentAtomIsContainer, kSpriteTrackPropertyHasActions, 1, NULL);

            if (myAtom != 0) {

                Ptr             myData = NULL;

                long            mySize = sizeof(Boolean);

                Boolean         myHasActions = false;

                // get the data in this atom

                myErr = QTGetAtomDataPtr(myContainer, myAtom, &mySize, &myData);

                if (myErr != noErr)

                    goto bail;

                // if the data is 1, then the track has wired actions

                myHasActions = (Boolean)*myData;

                if (myHasActions) {

                    (**myAppData).fMovieHasActions = true;

                    goto bail;

                }

            }

            QTDisposeAtomContainer(myContainer);

            myContainer = NULL;

            // get the next sprite track

            myCount++;

            myTrack = GetMovieIndTrackType((**theWindowObject).fMovie, myCount, SpriteMediaType, movieTrackMediaType | movieTrackEnabledOnly);

        }

    }

bail:

    if (myContainer != NULL)

        QTDisposeAtomContainer(myContainer);

}

//////////

//

// VRActions_DumpWindowData

// Get rid of any window-specific data for sprites.

//

//////////

void VRActions_DumpWindowData (WindowObject theWindowObject)

{

#pragma unused(theWindowObject)

    // nothing yet....

}