abgradient.pas

著名的虚拟仪表控件,包含全部源码, 可以在,delphi2007 下安装运行

unit AbGradient;

{******************************************************************************}
{ Abakus VCL                                                                   }
{                            component AbGradient                              }
{                                                                              }
{******************************************************************************}
{        e-Mail: [e-mail] , Web: http://www.abaecker.com            }
{------------------------------------------------------------------------------}
{          (c) Copyright 1998..2000 A.Baecker, All rights Reserved             }
{******************************************************************************}

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  _GClass, _AbProc;

type
  TAbGradient = class(TAbGraphicControl)
  private
    { Private-Deklarationen }
    FGradSettings: TAbGradSettings;
  protected
    { Protected-Deklarationen }
    procedure Paint; override;
    procedure ParamChange(Sender: TObject); override;
    procedure Loaded; override;
  public
    { Public-Deklarationen }
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
  published
    property Align;
    property Visible;
    property OnClick;
    property OnDblClick;
    property OnDragDrop;
    property OnDragOver;
    property OnEndDrag;
    property OnMouseDown;
    property OnMouseUp;
    property OnStartDrag;
    property GradSettings: TAbGradSettings read FGradSettings write
    FGradSettings;
  end;


implementation

procedure TAbGradient.Paint;
begin
  if (not Visible and not (csDesigning in Componentstate)) then Exit;
  AbGradFill(Canvas,
    ClientRect,
    FGradSettings.ColorFrom, FGradSettings.ColorTo,
    FGradSettings.Style);

end;

constructor TAbGradient.Create(AOwner: TComponent);
begin
  BeginUpdate;
  inherited Create(AOwner);
  if (AOwner is TWinControl) then Parent := AOwner as TWinControl;
  Width := 50;
  Height := 50;
  FGradSettings := TAbGradSettings.Create;
  if (csDesigning in Componentstate) then Loaded;
end;

procedure TAbGradient.Loaded;
begin
  FGradSettings.OnChange := ParamChange;
  EndUpdate;
end;

destructor TAbGradient.Destroy;
begin
  FGradSettings.Free;
  inherited Destroy;
end;

procedure TAbGradient.ParamChange(Sender: TObject);
begin
  inherited ParamChange(Sender);
  Invalidate;
end;

end.