2018-10-13 窗体透明控制

unit Unit1;

interface

uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls;

type

  TForm1 = class(TForm)

    Button1: TButton;

    ScrollBar1: TScrollBar;

    procedure Button1Click(Sender: TObject);

    procedure FormCreate(Sender: TObject);

    procedure ScrollBar1Change(Sender: TObject);

  private

    { Private declarations }

  public

    { Public declarations }

  end;

var

  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);

begin

          form1.AlphaBlend:=true;

          ScrollBar1.enabled:=true;

end;

procedure TForm1.FormCreate(Sender: TObject);

begin

        scrollbar1.Min:=0;

        scrollbar1.Max:=255;

        scrollbar1.position:=255;

        scrollbar1.Enabled:=False;

        form1.AlphaBlend:=False;

end;

procedure TForm1.ScrollBar1Change(Sender: TObject);

begin

    Form1.AlphaBlendvalue:=ScrollBar1.Position;  //AlphaBlendvalue

end;

end.