MacFormat 1995 June/MacFormat 25.iso/Shareware City/Developers/ICAppSourceKit1.0/ICIconSuites.p

Text File | 1994-10-31 | 5.4 KB | 220 lines | [TEXT/PJMM]

unit ICIconSuites;

interface

    procedure InitICIconSuites;
    function GetDTDBIconSuiteCached (ftype, fcreator: OSType; var suite: Handle): OSErr;

implementation

    uses
        ICGlobals, ICMiscSubs, IconFamilies;

    function GetDTDBIcon (ftype, fcreator: OSType; var cookie: integer; icon_to_get: SignedByte; var pbdt: DTPBRec): OSErr;
        function GetTheIcon (dtrn: integer): boolean;
        begin
            pbdt.ioDTRefNum := dtrn;
            pbdt.ioTagInfo := 0;
            pbdt.ioIconType := icon_to_get;
            pbdt.ioFileCreator := fcreator;
            pbdt.ioFileType := ftype;
            GetTheIcon := PBDTGetIconSync(@pbdt) = noErr;
        end;

        var
            oe: OSErr;
            i: integer;
            found: boolean;
            junkstr: Str63;
            vrefnum: OSErr;
            crdate: longint;
    begin
        found := false;
        if system7 then begin
            if cookie = 0 then begin
                i := 1;
                repeat
                    vrefnum := 0;
                    junkstr := '';
                    oe := GetVolInfo(junkstr, vrefnum, i, crdate);
                    i := i + 1;
                    if oe = noErr then begin
                        with pbdt do begin
                            ioNamePtr := nil;
                            ioVRefNum := vrefnum;
                            oe := PBDTGetPath(@pbdt);
                            if oe = noErr then begin
                                if GetTheIcon(pbdt.ioDTRefNum) then begin
                                    cookie := pbdt.ioDTRefNum;
                                    found := true;
                                end;
                            end;
                        end;
                        oe := noErr;
                    end;
                until found or (oe <> noErr);
            end
            else begin
                found := GetTheIcon(cookie);
            end;
        end;
        if found then begin
            oe := noErr;
        end
        else begin
            oe := afpItemNotFound;
        end;
        GetDTDBIcon := oe;
    end; (* GetDTDBIcon *)

    var
        icon_buffer: packed array[0..1023] of byte;

    function GetDTDBIconH (ftype, fcreator: OSType; var cookie: integer; icon_to_get: SignedByte; var iconh: Handle): OSErr;
        var
            dtpb: DTPBRec;
            err: OSErr;
    begin
        iconh := nil;
        dtpb.ioDTBuffer := @icon_buffer;
        dtpb.ioDTReqCount := sizeof(icon_buffer);
        err := GetDTDBIcon(ftype, fcreator, cookie, icon_to_get, dtpb);
        if err = noErr then begin
            err := PtrToHand(@icon_buffer, iconh, dtpb.ioDTActCount);
        end; (* if *)
        if err <> noErr then begin
            DisposeHandle(iconh);
            iconh := nil;
        end; (* if *)
        GetDTDBIconH := err;
    end; (* GetDTDBIconH *)

    function GetDTDBAddSuite (suite: Handle; ftype, fcreator: OSType; var cookie: integer; icon_to_get: SignedByte; icon_to_put: OSType): OSErr;
        var
            err: OSErr;
            iconh: Handle;
    begin
        err := GetDTDBIconH(ftype, fcreator, cookie, icon_to_get, iconh);
        if err = noErr then begin
            err := AddIconToSuite(iconh, suite, icon_to_put);
        end; (* if *)
        if err <> noErr then begin
            DisposeHandle(iconh);
            iconh := nil;
        end; (* if *)
        GetDTDBAddSuite := err;
    end; (* GetDTDBAddSuite *)

    function GetDTDBIconSuiteUncached (ftype, fcreator: OSType; var suite: Handle): OSErr;
        var
            err: OSErr;
            junk: OSErr;
            cookie: integer;
    begin
        suite := nil;
        err := NewIconSuite(suite);
        if err = noErr then begin
            cookie := 0;
            if GetDTDBAddSuite(suite, ftype, fcreator, cookie, kLargeIcon, large1BitMask) = noErr then begin
                junk := GetDTDBAddSuite(suite, ftype, fcreator, cookie, kLarge4BitIcon, large4BitData);
                junk := GetDTDBAddSuite(suite, ftype, fcreator, cookie, kLarge8BitIcon, large8BitData);
            end
            else begin
                err := afpItemNotFound;
            end; (* if *)
        end; (* if *)
        if err <> noErr then begin
            if suite <> nil then begin
                junk := DisposeIconSuite(suite, true);
                suite := nil;
            end; (* if *)
        end; (* if *)
        GetDTDBIconSuiteUncached := err;
    end; (* GetDTDBIconSuiteUncached *)

    const
        cache_max = 20;

    type
        CacheRecord = record
                usage: longInt;
                ftype, fcreator: OSType;
                suite: handle;
            end;

    var
        cache: array[1..cache_max] of CacheRecord;
        usage: longInt;
        default_application_suite: handle;
        default_document_suite: handle;

    function GetDTDBIconSuiteCached (ftype, fcreator: OSType; var suite: Handle): OSErr;
        var
            err, junk: OSErr;
            i, j: integer;
            m: longInt;
    begin
        err := -1;
        suite := nil;
        for i := 1 to cache_max do begin
            if (cache[i].usage > 0) & (cache[i].ftype = ftype) & (cache[i].fcreator = fcreator) then begin
                suite := cache[i].suite;
                err := noErr;
                cache[i].usage := usage;
                usage := usage + 1;
                leave;
            end;
        end;
        if err <> noErr then begin
            m := maxLongInt;
            for i := 1 to cache_max do begin
                if (cache[i].usage < m) then begin
                    j := i;
                    m := cache[i].usage;
                end;
            end;
            err := GetDTDBIconSuiteUncached(ftype, fcreator, suite);
            if err = noErr then begin
                if m > 0 then begin
                    junk := DisposeIconSuite(cache[j].suite, true);
                end;
                cache[j].suite := suite;
                cache[j].ftype := ftype;
                cache[j].fcreator := fcreator;
                cache[j].usage := usage;
                usage := usage + 1;
            end;
        end;
        if (err = noErr) & (suite = nil) then begin
            err := resNotFound;
        end;
        if (err <> noErr) then begin
            suite := default_document_suite;
            if (ftype = 'APPL') & (default_application_suite <> nil) then begin
                suite := default_application_suite;
            end;
        end;
        GetDTDBIconSuiteCached := err;
    end;

    procedure InitICIconSuites;
        var
            i: integer;
    begin
        for i := 1 to cache_max do begin
            cache[i].usage := -1;
        end;
        usage := 1;
        default_application_suite := nil;
        default_document_suite := nil;
        if system7 then begin
            if GetIconSuite(default_document_suite, -4000, svAllLargeData) <> noErr then begin
                default_document_suite := nil;
            end; (* if *)
            if GetIconSuite(default_application_suite, -3996, svAllLargeData) <> noErr then begin
                default_application_suite := nil;
            end; (* if *)
        end; (* if *)
    end;

end.