/*
	File:		GetFile.c
	
	Description: Get a single file using Navigation Services

	Author:		based on code from QTShell sample

	Copyright: 	© Copyright 2000 Apple Computer, Inc. All rights reserved.
	
	Disclaimer:	IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.
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	Change History (most recent first): <1> 4/1/00 initial release

*/

#include "GetFile.h"

const OSType    kApplicationSignature  = FOUR_CHAR_CODE('????');
const ResType   kOpenResourceType = FOUR_CHAR_CODE('open');
const StringPtr kApplicationName = "\pExample";

//////////
//
// GetOneFileWithPreview
// Display the appropriate file-opening dialog box, with an optional QuickTime preview pane. If the user
// selects a file, return information about it using the theFSSpecPtr parameter.
//
// Note that both StandardGetFilePreview and NavGetFile use the function specified by theFilterProc as a
// file filter. This framework always passes NULL in the theFilterProc parameter. If you use this function
// in your own code, keep in mind that on Windows the function specifier must be of type FileFilterUPP and 
// on Macintosh it must be of type NavObjectFilterUPP. (You can use the QTFrame_GetFileFilterUPP to create
// a function specifier of the appropriate type.) Also keep in mind that Navigation Services expects a file 
// filter function to return true if a file is to be displayed, while the Standard File Package expects the
// filter to return false if a file is to be displayed.
//
//////////
OSErr GetOneFileWithPreview (short theNumTypes, TypeListPtr theTypeList, FSSpecPtr theFSSpecPtr, void *theFilterProc)
{
	
#if TARGET_OS_WIN32
	StandardFileReply	myReply;
#endif
#if TARGET_OS_MAC
	NavReplyRecord		myReply;
	NavDialogOptions	myDialogOptions;
	NavTypeListHandle	myOpenList = NULL;
	NavEventUPP			myEventUPP = NewNavEventUPP(HandleNavEvent);
#endif
	OSErr				myErr = noErr;
	
	if (theFSSpecPtr == NULL)
		return(paramErr);

#if TARGET_OS_WIN32
	// prompt the user for a file
	StandardGetFilePreview((FileFilterUPP)theFilterProc, theNumTypes, (ConstSFTypeListPtr)theTypeList, &myReply);
	if (!myReply.sfGood)
		return(userCanceledErr);
	
	// make an FSSpec record
	myErr = FSMakeFSSpec(myReply.sfFile.vRefNum, myReply.sfFile.parID, myReply.sfFile.name, theFSSpecPtr);
#endif

#if TARGET_OS_MAC
	// specify the options for the dialog box
	NavGetDefaultDialogOptions(&myDialogOptions);
	myDialogOptions.dialogOptionFlags -= kNavNoTypePopup;
	myDialogOptions.dialogOptionFlags -= kNavAllowMultipleFiles;
	BlockMoveData(kApplicationName, myDialogOptions.clientName, kApplicationName[0] + 1);
	
	// create a handle to an 'open' resource
	myOpenList = (NavTypeListHandle)CreateOpenHandle(kApplicationSignature, theNumTypes, theTypeList);
	if (myOpenList != NULL)
		HLock((Handle)myOpenList);
	
	// prompt the user for a file
	myErr = NavGetFile(NULL, &myReply, &myDialogOptions, myEventUPP, NULL, (NavObjectFilterUPP)theFilterProc, myOpenList, NULL);
	if ((myErr == noErr) && myReply.validRecord) {
		AEKeyword		myKeyword;
		DescType		myActualType;
		Size			myActualSize = 0;
		
		// get the FSSpec for the selected file
		if (theFSSpecPtr != NULL)
			myErr = AEGetNthPtr(&(myReply.selection), 1, typeFSS, &myKeyword, &myActualType, theFSSpecPtr, sizeof(FSSpec), &myActualSize);

		NavDisposeReply(&myReply);
	}
	
	if (myOpenList != NULL) {
		HUnlock((Handle)myOpenList);
		DisposeHandle((Handle)myOpenList);
	}
	
	DisposeNavEventUPP(myEventUPP);
#endif
 
	return(myErr);
}

//////////
//
// CreateOpenHandle
// Get the 'open' resource or dynamically create a NavTypeListHandle.
//
//////////
Handle CreateOpenHandle (OSType theApplicationSignature, short theNumTypes, TypeListPtr theTypeList)
{
	Handle			myHandle = NULL;
	
	// see if we have an 'open' resource...
	myHandle = Get1Resource('open', 128);
	if ( myHandle != NULL && ResError() == noErr ) {
		DetachResource( myHandle );
		return myHandle;
	} else {
		myHandle = NULL;
	}
	
	// nope, use the passed in types and dynamically create the NavTypeList
	if (theTypeList == NULL)
		return myHandle;
	
	if (theNumTypes > 0) {
		myHandle = NewHandle(sizeof(NavTypeList) + (theNumTypes * sizeof(OSType)));
		if (myHandle != NULL) {
			NavTypeListHandle 	myOpenResHandle	= (NavTypeListHandle)myHandle;
			
			(*myOpenResHandle)->componentSignature = theApplicationSignature;
			(*myOpenResHandle)->osTypeCount = theNumTypes;
			BlockMoveData(theTypeList, (*myOpenResHandle)->osType, theNumTypes * sizeof(OSType));
		}
	}
	
	return myHandle;
}

//////////
//
// HandleNavEvent
// A callback procedure that handles events while a Navigation Service dialog box is displayed.
//
//////////
//PASCAL_RTN void HandleNavEvent(NavEventCallbackMessage theCallBackSelector, NavCBRecPtr theCallBackParms, void *theCallBackUD)
pascal void HandleNavEvent(NavEventCallbackMessage theCallBackSelector, NavCBRecPtr theCallBackParms, void *theCallBackUD)
{
#pragma unused(theCallBackUD)
	
	if (theCallBackSelector == kNavCBEvent) {
		switch (theCallBackParms->eventData.eventDataParms.event->what) {
			case updateEvt:
#if TARGET_OS_MAC
				// Handle Update Event
#endif
				break;
			case nullEvent:
				// Handle Null Event
				break;
		}
	}
}