/*

File: IconListUtilities.c

Abstract: Handles adding and removing data from the custom Icon List.

Version: 4.0

Change History:

    <4.0>   removed all Classic code

    <3.0>   no changes necessary

    <2.0>   changed ReleaseListIcons to make sure the icons get 

            released when they are unregistered (see the comment 

            in the function for discussion)

    <1.0>   first release version

            though we're not using them, Mac OS 8.6 introduces 

            packages; we made getCurrentResourceFSSpec to allow for 

            the possibility that our main application file might not 

            contain the 'icns' resources at some point in the future

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*/

#include "ExamplePrefs.h"

#include "IconListDef.h"

#include "IconListUtilities.h"

static Boolean gIconsRegistered;

static OSErr getCurrentResourceFSSpec(FSSpec *curResSpec);

// --------------------------------------------------------------------------------------

void ClearIconsAreRegistered(void)

{

    gIconsRegistered = false;

}

// --------------------------------------------------------------------------------------

void AddRowsAndDataToIconList(ListHandle iconList, SInt16 iconFamilyBaseID)

{

    short dataLength, rowNumber;

    IconListCellDataRec cellData;

    Cell theCell;

    if (!gIconsRegistered)      // if we didn't register our icons already, we need to

    {

        OSErr error;

        FSSpec iconResFile;

            /* The first thing we need to do to register an IconRef is to get the FSSpec 

               for the file containing the icon resources.  This could be the 

               application file itself or a flattened resource file in a bundle.  Either 

               way, in this program it's the "current" resource file so we call our 

               utility function that converts the file reference number returned by 

               CurResFile to an FSSpec. */

        error = getCurrentResourceFSSpec(&iconResFile);

        if (error != noErr)     // if we can't get our icons, this program is kind of useless

            ExitToShell();

            // we've got the FSSpec, now get the icons out of it

        dataLength = sizeof(IconListCellDataRec);

                                                        // Mac OS 8/9 under CarbonLib requires 

        for (rowNumber = 0; rowNumber < kNumberOfRows; rowNumber++)     // the 'icns' resources 

        {       // to be in the resource fork of the file for the following call to work

            RegisterIconRefFromResource(kAppSignature, 'LIc0' + rowNumber, &iconResFile, 

                                        iconFamilyBaseID + rowNumber, &cellData.icon);

            GetIndString(cellData.name, rIconListStrings, rowNumber + 1);

            rowNumber = LAddRow(1, rowNumber, iconList);    // add each row to the 

            SetPt(&theCell, 0, rowNumber);                  // bottom of the List

            LSetCell(&cellData, dataLength, theCell, iconList);

        }

        gIconsRegistered = true;

    }

    else    // the icons are already registered so we just have to get them

    {

        dataLength = sizeof(IconListCellDataRec);

        for (rowNumber = 0; rowNumber < kNumberOfRows; rowNumber++)

        {

            GetIconRef(kOnSystemDisk, kAppSignature, 'LIc0' + rowNumber, &cellData.icon);

            GetIndString(cellData.name, rIconListStrings, rowNumber + 1);

            rowNumber = LAddRow(1, rowNumber, iconList);    // add each row to the 

            SetPt(&theCell, 0, rowNumber);                  // bottom of the List

            LSetCell(&cellData, dataLength, theCell, iconList);

        }

    }

}

// --------------------------------------------------------------------------------------

void ReleaseIconListIcons(ListHandle iconList)

{

    short dataLength;

    IconListCellDataRec cellData;

    Cell theCell;

    UInt16 referenceCount;

    Boolean needRelease = false;

    dataLength = sizeof(IconListCellDataRec);

    SetPt(&theCell, 0, 0);

    LGetCell(&cellData, &dataLength, theCell, iconList);

    GetIconRefOwners(cellData.icon, &referenceCount);

    if (referenceCount == 1)    // if this is the last instance of the 

    {                           // IconRefs we should unregister them

        OSType iconType;

            /* UnregisterIconRef doesn't decrement the reference count on some versions 

               of Mac OS X (it does on 10.1.5, doesn't on 10.2.8, and does on 10.3.4).  

               To account for this we will retain/acquire the icon, unregister it, then 

               check the reference/owner count.  If it's the same then we will also 

               release the icons.  We can't release the icons first or UnregisterIconRef 

               will return noSuchIconErr (because the icons will already be disposed).  

               Likewise we can't just release the icons afterwards because they may get 

               disposed of when they're unregistered. */

        AcquireIconRef(cellData.icon);

        for (iconType = 'LIc0'; iconType <= 'LIc9'; iconType++)

            UnregisterIconRef(kAppSignature, iconType);

        gIconsRegistered = false;

        GetIconRefOwners(cellData.icon, &referenceCount);

        if (referenceCount > 1)

            needRelease = true;

        ReleaseIconRef(cellData.icon);

    }

    else                        // otherwise simply release the icons

        needRelease = true;

    if (needRelease)

    {

        short rowNumber;

        ReleaseIconRef(cellData.icon);

        for (rowNumber = 1; rowNumber < kNumberOfRows; rowNumber++)

        {

            dataLength = sizeof(IconListCellDataRec);

            SetPt(&theCell, 0, rowNumber);

            LGetCell(&cellData, &dataLength, theCell, iconList);

            ReleaseIconRef(cellData.icon);

        }

    }

}

// --------------------------------------------------------------------------------------

static OSErr getCurrentResourceFSSpec(FSSpec *curResSpec)

{

    OSErr error;

    FCBPBPtr fileInfo;      // file control block parameter block pointer

    StrFileName fileName;

        /* In the age of application packages and bundles, it's less likely that the 

           current resource file is the application file itself.  It's more likely to be 

           a flattened resource file in a bundle so we need a generic method instead of 

           the traditional Process Manager method of getting the current application's 

           FSSpec of it's executable file. */

    fileInfo = (FCBPBPtr)NewPtr(sizeof(FCBPBRec));

    fileInfo->ioNamePtr = fileName;     // to hold the resource file's name

    fileInfo->ioVRefNum = 0;            // 0 to search through all open files on all volumes

    fileInfo->ioRefNum = CurResFile();  // get info about the main resource file 

                                        // by using its reference number

    fileInfo->ioFCBIndx = 0;            // 0 to ignore this parameter and use the 

                                        // ioRefNum parameter instead

    error = PBGetFCBInfoSync(fileInfo); // synchronous because we don't have 

                        // anything else to do while we're waiting on the filesystem

    if (error == noErr)     // if we got the necessary file info, make an FSSpec out of it

        FSMakeFSSpec(fileInfo->ioFCBVRefNum, fileInfo->ioFCBParID, fileName, curResSpec);

    DisposePtr((Ptr)fileInfo);

    return error;

}