unit PreviewFrm;

{******************************************************************************}
{                                                                              }
{                StarUML - The Open Source UML/MDA Platform.                   }
{                                                                              }
{              Copyright (C) 2002-2005 - Plastic Software, Inc.                }
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{ This program is free software; you can redistribute it and/or modify it      }
{ under the terms of the GNU General Public License as published by the Free   }
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{ combine StarUML program with free software programs or libraries that are    }
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{******************************************************************************}

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ExtCtrls, StdCtrls;

const
  MAX_IMAGE_WIDTH = 200;
  MAX_IMAGE_HEIGHT = 230;
  IMAGE_INTERVAL = 30;
  
type
  TPreviewForm = class(TForm)
    PreviewScrollBox: TScrollBox;
    CloseButton: TButton;
    procedure AutoSizeImage(AImage: TImage);
  public
    procedure Preview(Images: TStringList);
  end;

implementation

{$R *.dfm}

procedure TPreviewForm.AutoSizeImage(AImage: TImage);
var
  W, H: Integer;
begin
  W := AImage.Picture.Width;
  H := AImage.Picture.Height;

  if W > MAX_IMAGE_WIDTH then begin
    H := MAX_IMAGE_WIDTH * H div W;
    W := MAX_IMAGE_WIDTH;
  end;
  if H > MAX_IMAGE_HEIGHT then begin
    W := MAX_IMAGE_HEIGHT * W div H;
    H := MAX_IMAGE_HEIGHT;
  end;

  AImage.Width := W;
  AImage.Height := H;
  AImage.Stretch := True;
end;

procedure TPreviewForm.Preview(Images: TStringList);
var
  Img: TImage;
  H, VC: Integer;
  I: Integer;
begin
  VC := PreviewScrollBox.ClientHeight div 2;
  H := IMAGE_INTERVAL;
  for I := 0 to Images.Count - 1 do begin
    Img := TImage.Create(Self);
    Img.Parent := PreviewScrollBox;
    try
      Img.Picture.LoadFromFile(Images[I]);
      AutoSizeImage(Img);
    except
      on E: Exception do begin
        Img.Width := IMAGE_INTERVAL;
        Img.Height := IMAGE_INTERVAL;
      end;
    end;
    Img.Left := H;
    Img.Top := VC - Img.Height div 2;
    H := H + Img.Width + IMAGE_INTERVAL;
  end;
  Img := TImage.Create(Self);
  Img.Parent := PreviewScrollBox;
  Img.Left := H;
  Img.Top := 1;
  Img.Width := 1;
  Img.Height := 1;

  ShowModal;
end;

end.