{*******************************************************************}
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{       Developer Express Visual Component Library                  }
{       ExpressPrinting System COMPONENT SUITE                      }
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unit dxPSFillPatterns;

interface

{$I cxVer.inc}

uses
  Classes, Windows, {$IFDEF DELPHI6} Types, {$ENDIF} Graphics, dxCore, dxBase, 
  dxPSSngltn;
  
type
  TdxPSPatternBitRow = Word;
  TdxPSPatternBitRows = array[0..7] of TdxPSPatternBitRow;
  
  TdxPSFillPatternClass = class of TdxPSFillPattern;

  TdxPSFillPattern = class(TPersistent)
  public    
    class procedure Register; virtual;
    class procedure Unregister; virtual;

    class procedure Bits(var APattern: TdxPSPatternBitRows); virtual;
    class function Dimensions: TSize; virtual;
    class function Name: string; virtual;
    class function RequiredBrushOrigin: Boolean; virtual;
    class function RequiredScaling: Boolean; virtual;
    class function Solid: Boolean; virtual;
  end;

  TdxPSSolidFillPattern = class(TdxPSFillPattern)
  public
    class procedure Bits(var APattern: TdxPSPatternBitRows); override;
    class function Name: string; override;
    class function RequiredBrushOrigin: Boolean; override;
    class function RequiredScaling: Boolean; override;
    class function Solid: Boolean; override;
  end;

  TdxPSGray50FillPattern = class(TdxPSFillPattern)
  public
    class procedure Bits(var APattern: TdxPSPatternBitRows); override;
    class function Name: string; override;
  end;

  TdxPSFillPatternItem = class
  private
    FBitmap: TBitmap;
    FBrush: TBrush;
    FPattern: TdxPSFillPatternClass;
  protected
    procedure Initialize(AIsPrinting: Boolean);
  public
    constructor Create(APattern: TdxPSFillPatternClass; AIsPrinting: Boolean);
    destructor Destroy; override;

    property Bitmap: TBitmap read FBitmap;
    property Brush: TBrush read FBrush;
    property Pattern: TdxPSFillPatternClass read FPattern;
  end;

  TdxPSFillPatternFactory = class(TBasedxPSSingleton)
  private
    FItems: TList;
    FPatterns: TdxClassList;
    FPrintItems: TList;

    function GetCount: Integer;
    function GetInternalItem(Index: Integer; IsPrinting: Boolean): TdxPSFillPatternItem;
    function GetItem(Pattern: TdxPSFillPatternClass; IsPrinting: Boolean): TdxPSFillPatternItem;
    function GetPattern(Index: Integer): TdxPSFillPatternClass;
    procedure SetInternalItem(Index: Integer; IsPrinting: Boolean; Value: TdxPSFillPatternItem);
    
    procedure AddPattern(APattern: TdxPSFillPatternClass);
    procedure RemovePattern(APattern: TdxPSFillPatternClass);

    function HasItem(APattern: TdxPSFillPatternClass): Boolean;
    function HasPrintItem(APattern: TdxPSFillPatternClass): Boolean;

    procedure RemovePatternItem(APattern: TdxPSFillPatternClass);
    procedure RemovePatternPrintItem(APattern: TdxPSFillPatternClass);
  protected
    procedure FinalizeInstance; override;
    procedure InitializeInstance; override;
    function IndexOf(APattern: TdxPSFillPatternClass): Integer;
    property InternalItems[Index: Integer; IsPrinting: Boolean]: TdxPSFillPatternItem read GetInternalItem write SetInternalItem;    
  public
    class function Instance: TdxPSFillPatternFactory; reintroduce; overload; 
    procedure Register(APattern: TdxPSFillPatternClass);
    procedure Unregister(APattern: TdxPSFillPatternClass);

    procedure ResetPrintItems;    
    property Count: Integer read GetCount;
    property Items[Pattern: TdxPSFillPatternClass; IsPrinting: Boolean]: TdxPSFillPatternItem read GetItem; default;
    property Patterns[Index: Integer]: TdxPSFillPatternClass read GetPattern;
  end;

function dxPSFillPatternFactory: TdxPSFillPatternFactory;

implementation

uses
  SysUtils, Forms, cxClasses, dxPSRes, dxPrnDev, dxPSUtl;
    
function dxPSFillPatternFactory: TdxPSFillPatternFactory;
begin
  Result := TdxPSFillPatternFactory.Instance;
end;

{ TdxPSFillPattern }

class procedure TdxPSFillPattern.Register;
begin
  dxPSFillPatternFactory.Register(Self);
end;

class procedure TdxPSFillPattern.Unregister;
begin
  dxPSFillPatternFactory.Unregister(Self);
end;

class procedure TdxPSFillPattern.Bits(var APattern: TdxPSPatternBitRows);
const
  Bits: TdxPSPatternBitRows = ($0000, $0000, $0000, $0000, $0000, $0000, $0000, $0000);
begin
  APattern := Bits;
end;

class function TdxPSFillPattern.Dimensions: TSize;
begin
  Result.cX := 8;
  Result.cY := 8;  
end;

class function TdxPSFillPattern.Name: string;
begin
  Result := '';
end;

class function TdxPSFillPattern.RequiredBrushOrigin: Boolean;
begin
  Result := True;
end;

class function TdxPSFillPattern.RequiredScaling: Boolean;
begin
  Result := True;
end;

class function TdxPSFillPattern.Solid: Boolean;
begin
  Result := False;
end;

{ TdxPSSolidFillPattern }

class procedure TdxPSSolidFillPattern.Bits(var APattern: TdxPSPatternBitRows);
const
  Bits: TdxPSPatternBitRows = ($0000, $0000, $0000, $0000, $0000, $0000, $0000, $0000);
begin
  APattern := Bits;
end;
    
class function TdxPSSolidFillPattern.Name: string;
begin
  Result := cxGetResourceString(@sdxSolidFillPattern);
end;

class function TdxPSSolidFillPattern.RequiredBrushOrigin: Boolean;
begin
  Result := False;
end;

class function TdxPSSolidFillPattern.RequiredScaling: Boolean;
begin
  Result := False;
end;

class function TdxPSSolidFillPattern.Solid: Boolean;
begin
  Result := True;
end;

{ TdxPSGray50FillPattern }

class procedure TdxPSGray50FillPattern.Bits(var APattern: TdxPSPatternBitRows);
const
  Bits: TdxPSPatternBitRows = ($5555, $AAAA, $5555, $AAAA, $5555, $AAAA, $5555, $AAAA);
begin
  APattern := Bits;
end;

class function TdxPSGray50FillPattern.Name: string;
begin
  Result := cxGetResourceString(@sdxGray50FillPattern);
end;

{ TdxPSFillPatternItem }

constructor TdxPSFillPatternItem.Create(APattern: TdxPSFillPatternClass; AIsPrinting: Boolean);
begin
  inherited Create;
  FBitmap := TBitmap.Create;
  FBrush := TBrush.Create;
  FPattern := APattern;
  Initialize(AIsPrinting);
end;
    
destructor TdxPSFillPatternItem.Destroy;
begin
  FBrush.Free;
  FBitmap.Free;
  inherited Destroy;
end;

procedure TdxPSFillPatternItem.Initialize(AIsPrinting: Boolean);

  procedure ScaleBitmap(ABitmap: TBitmap);
  var
    Numerator, Denominator: Integer;
    TempBitmap: TBitmap;
  begin
    Numerator := GetDeviceCaps(dxPrintDevice.Handle, LOGPIXELSY);
    Denominator := Screen.PixelsPerInch;
    TempBitmap := TBitmap.Create;
    try
      TempBitmap.Assign(ABitmap);
      ABitmap.Height := ABitmap.Height * Numerator div Denominator;
      ABitmap.Width := ABitmap.Width * Numerator div Denominator;    
      ABitmap.Canvas.StretchDraw(Rect(0, 0, ABitmap.Width, ABitmap.Height), TempBitmap);
    finally
      TempBitmap.Free;
    end;
  end;

const
  Colors: array[Boolean] of TColor = (clWhite, clBlack);
var
  Size: TSize;
  I, J: Integer;
  PatternBits: TdxPSPatternBitRows;
  PatternRow: TdxPSPatternBitRow;
begin
  Size := Pattern.Dimensions;
  if Size.cX < 8 then Size.cX := 8;
  if Size.cY < 8 then Size.cY := 8;

  with Bitmap, Canvas do
  begin
    Width := Size.cX;
    Height := Size.cY;
    Monochrome := True;
    Pattern.Bits(PatternBits);
    for I := 0 to Size.cY - 1 do
    begin
      PatternRow := PatternBits[I];
      for J := 0 to Size.cX - 1 do
        Pixels[J, I] := Colors[PatternRow and (1 shl J) = 0];
    end;
  end;

  if AIsPrinting and Pattern.RequiredScaling then 
    ScaleBitmap(Bitmap);
  Brush.Bitmap := Bitmap;
end;

{ TdxPSFillPatternFactory }    

class function TdxPSFillPatternFactory.Instance: TdxPSFillPatternFactory;
begin
  Result := inherited Instance as TdxPSFillPatternFactory;
end;

procedure TdxPSFillPatternFactory.Register(APattern: TdxPSFillPatternClass);
begin
  if IndexOf(APattern) = -1 then
  begin
    AddPattern(APattern);
    Classes.RegisterClass(APattern); 
  end;  
end;

procedure TdxPSFillPatternFactory.Unregister(APattern: TdxPSFillPatternClass);
begin
  RemovePattern(APattern);
  //Classes.UnregisterClass(APattern);
end;

procedure TdxPSFillPatternFactory.ResetPrintItems;
var
  I: Integer;
begin
  for I := 0 to FPrintItems.Count - 1 do 
  begin
    TObject(FPrintItems[I]).Free;
    FPrintItems[I] := nil;
  end;  
end;

procedure TdxPSFillPatternFactory.FinalizeInstance;

  procedure FreeObjectList(AList: TList);
  var
    I: Integer;
  begin
    for I := 0 to AList.Count - 1 do 
      TObject(AList[I]).Free;
    AList.Free;
  end;  
   
begin
  FreeObjectList(FItems);
  FreeObjectList(FPrintItems);
  FreeAndNil(FPatterns);
  inherited;
end;

procedure TdxPSFillPatternFactory.InitializeInstance;
begin
  inherited;
  FItems := TList.Create;
  FPatterns := TdxClassList.Create;
  FPrintItems := TList.Create;
end;

function TdxPSFillPatternFactory.IndexOf(APattern: TdxPSFillPatternClass): Integer;
begin
  Result := FPatterns.IndexOf(APattern);
end;

function TdxPSFillPatternFactory.GetCount: Integer;
begin
  Result := FPatterns.Count;
end;

function TdxPSFillPatternFactory.GetInternalItem(Index: Integer; IsPrinting: Boolean): TdxPSFillPatternItem;
begin
  if IsPrinting then 
    Result := TdxPSFillPatternItem(FPrintItems[Index])
  else  
    Result := TdxPSFillPatternItem(FItems[Index]);
end;

function TdxPSFillPatternFactory.GetItem(Pattern: TdxPSFillPatternClass; IsPrinting: Boolean): TdxPSFillPatternItem;
var
  Index: Integer;
begin
  if Pattern <> nil then 
  begin
    Index := IndexOf(Pattern);
    if Index = -1 then
      raise EdxException.CreateFmt(cxGetResourceString(@sdxPatternIsNotRegistered), [Pattern.ClassName]);
    if InternalItems[Index, IsPrinting] = nil then 
      InternalItems[Index, IsPrinting] := TdxPSFillPatternItem.Create(Pattern, IsPrinting);
    Result := InternalItems[Index, IsPrinting];
  end    
  else
    Result := nil;
end;

function TdxPSFillPatternFactory.GetPattern(Index: Integer): TdxPSFillPatternClass;
begin
  Result := TdxPSFillPatternClass(FPatterns[Index]);
end;

procedure TdxPSFillPatternFactory.SetInternalItem(Index: Integer; IsPrinting: Boolean; 
  Value: TdxPSFillPatternItem);
begin
  if IsPrinting then 
    FPrintItems[Index] := Value
  else  
    FItems[Index] := Value;
end;

procedure TdxPSFillPatternFactory.AddPattern(APattern: TdxPSFillPatternClass);
begin
  FPatterns.Add(APattern);
  FItems.Add(nil);
  FPrintItems.Add(nil);
end;

procedure TdxPSFillPatternFactory.RemovePattern(APattern: TdxPSFillPatternClass);
begin
  if HasItem(APattern) then RemovePatternItem(APattern);
  if HasPrintItem(APattern) then RemovePatternPrintItem(APattern);
  FPatterns.Remove(APattern);
end;

function TdxPSFillPatternFactory.HasItem(APattern: TdxPSFillPatternClass): Boolean;
begin
  Result := InternalItems[IndexOf(APattern), False] <> nil;
end;

function TdxPSFillPatternFactory.HasPrintItem(APattern: TdxPSFillPatternClass): Boolean;
begin
  Result := InternalItems[IndexOf(APattern), True] <> nil;
end;
  
procedure TdxPSFillPatternFactory.RemovePatternItem(APattern: TdxPSFillPatternClass);
var
  Item: TdxPSFillPatternItem;
begin
  Item := Items[APattern, False];
  FItems.Remove(Item);
  Item.Free;
end;

procedure TdxPSFillPatternFactory.RemovePatternPrintItem(APattern: TdxPSFillPatternClass);
var
  Item: TdxPSFillPatternItem;
begin
  Item := Items[APattern, True];
  FPrintItems.Remove(Item);
  Item.Free;
end;

initialization
  TdxPSSolidFillPattern.Register;
  TdxPSGray50FillPattern.Register;

end.