Programmer 7500/MAX_PROGRAMMERS.iso/PASCAL/PLX13.ZIP/FONTS.PAS

Pascal/Delphi Source File | 1991-10-11 | 5.4 KB | 213 lines

{FONTS - Extensions to ObjectWindows Copyright (C) Doug Overmyer 10/1/91}
{This unit puts an OO face on enum. fonts for a given DC. Stores info in
    mem structure and facilitates retrieval}
unit Fonts;


{******************************************************************}
{ I N T E R F A C E                                                }
{******************************************************************}
interface
uses WinTypes, WinProcs, WinDos, Strings, WObjects,StdDlgs,
      WFPlus,WOPlus;

type
    PIntObj = ^TIntObj;
  TIntObj = object(TObject)
      Int:Integer;
    constructor Init(NewInt:Integer);
    destructor Done;virtual;
    end;


type                          {convert TLogFont records to objects}
PFontItem = ^TFontItem;
TFontItem = object(TObject)
    LogFont:TLogFont;
  FontType:Integer;
  Sizes:PCollection;
  constructor Init(NewItem:TLogFont;NewType:Integer);
  destructor Done;virtual;
end;

PFontCollection = ^TFontCollection;   {Collection of printer TLOGFont recs}
TFontCollection = object(TSortedCollection)
    function KeyOf(Item:Pointer):Pointer;virtual;
  function Compare(Key1,Key2:Pointer):Integer;virtual;
  function GetCount:Integer;virtual;
end;

type PFonts = ^TFonts;
TFonts = object
    LogPixlX,LogPixlY:Integer;
  constructor Init;
  destructor Done;virtual;
  procedure ReInit;virtual;
  procedure Enumerate(TheDC:hDC);virtual;
  function At(Index:Integer):pointer;virtual;
  function Count:Integer;virtual;
  function LogPixX:Integer;virtual;
  function LogPixY:Integer;virtual;
end;


{********************************************************************}
{I M P L E M E N T A T I O N                                         }
{********************************************************************}
implementation

{********************************************************************}
{G L O B A L  V A R I A B L E S                                      }
{********************************************************************}
var
  Faces:PFontCollection; {collection of PFontItem for call-back func}

{***********************************************************************}
constructor TIntObj.Init(NewInt:Integer);
begin
    Int := NewInt;
end;

destructor TIntObj.Done;
begin

end;
{********************************************************************}
constructor TFontItem.Init(NewItem:TLogFont;NewType:Integer);
begin
    LogFont := NewItem;
  FontType := NewType;
  Sizes := New(PCollection,Init(10,10));
end;

destructor TFontItem.Done;
begin
    Dispose(Sizes,Done);
end;

{*********************************************************************}
function TFontCollection.KeyOf(Item:Pointer):Pointer;
var
    Ptr :PChar;
begin
    Ptr := PFontItem(Item)^.LogFont.lfFaceName;
    KeyOf := Ptr;
end;


function TFontCollection.Compare(Key1,Key2:Pointer):Integer;
begin
    Compare := StrIComp(PChar(Key1),PChar(Key2));
end;

function TFontCollection.GetCount:Integer;
begin
    GetCount := Count;
end;
{******************************************************************}
constructor TFonts.Init;
begin
    Faces := New(PFontCollection,Init(100,100));
  Faces^.Duplicates := False;
  LogPixlX := 0;
  LogPixlY := 0;
end;

destructor TFonts.Done;
begin
    Dispose(Faces,Done);
end;

procedure TFonts.ReInit;
begin
    Dispose(Faces,Done);
    Faces := New(PFontCollection,Init(100,100));
  Faces^.Duplicates := False;
  LogPixlX := 0;
  LogPixlY := 0;
end;


function EnumerateFace(var LogFont: TLogFont; TextMetric: PTextMetric;
      FontType: Integer; Data: PChar): Integer; export;
 function DupF(Item:PFontItem):Boolean;far;
     begin
  DupF := (StrIComp(Item^.LogFont.lfFaceName, LogFont.lfFacename)= 0);
  end;
var
  Result:PFontItem;
begin
   Result := Faces^.FirstThat(@DupF);
   if Result = nil then Faces^.Insert(New(PFontItem,Init(LogFont,FontType)));
   EnumerateFace := 1;
end;


function EnumerateSize(var LogFont: TLogFont; TextMetric: PTextMetric;
          FontType: Integer; Indx: PChar): Integer; export;
 function DupS(Item:PIntObj):Boolean;far;
      begin
       DupS := (Item^.Int = LogFont.lfHeight);
   end;
var
  Result :PIntObj;
  FI:PFontItem;
  Indxx :Integer;
  Error:Integer;
begin
    Val(Indx,Indxx,Error);
  FI := Faces^.At(Indxx);
  Result := FI^.Sizes^.FirstThat(@DupS);
  if Result = nil then Fi^.Sizes^.AtInsert(0,(New(PIntObj,Init(LogFont.lfHeight)))) ;
    EnumerateSize := 1;
end;



procedure TFonts.Enumerate(TheDC:hDC);
var
  EnumProc: TFarProc;
  Indx:Integer;
  pIndx:PChar;
  szIndx:Array[0..25] of Char;
  FontItem :PFontItem;

begin
    pIndx := @szIndx;
    StrCopy(szIndx,'');
  EnumProc := MakeProcInstance(@EnumerateFace, HInstance);
  EnumFonts(TheDC, nil, EnumProc,nil);
  EnumProc := MakeProcInstance(@EnumerateSize, HInstance);
  for Indx := 0 to Faces^.Count -1 do
      begin
    Str(Indx,szIndx);
    FontItem := Faces^.At(Indx);
    EnumFonts(TheDC, FontItem^.LogFont.lfFaceName,
        EnumProc,pIndx);
    end;
  LogPixlX := GetDeviceCaps(TheDC,LogPixelsX);
  LogPixlY := GetDeviceCaps(TheDC,LogPixelsY);
end;

function TFonts.At(Index:Integer):Pointer;
begin
    At := Faces^.At(Index);
end;

function TFonts.Count:Integer;
begin
    Count := Faces^.Count;
end;

function TFonts.LogPixX:Integer;
begin
    LogPixX := LogPixlX;
end;

function TFonts.LogPixY:Integer;
begin
    LogPixY := LogPixlY;
end;
{******************************************************************}
end.