delphi 实现透明窗体
unit Exa1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
procedure Button2Click(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
procedure WMNCHitTest(var M: TWMNCHitTest); message wm_NCHitTest;
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.FormCreate(Sender: TObject);
begin
Self.Left := 100; // 此为窗体的左端在屏幕中的位置
Self.Top := 100; // 此为窗体的上端在屏幕中的位置
Self.Width := 300; // 此为窗体的宽度
Self.Height := 300; // 此为窗体的高度
Self.Color := clBlack; // 此为窗体的颜色
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
if Self.Button1.Caption = 'Normal' then //如果按钮Caption为Normal
begin
Self.Button1.Caption := 'Transparant'; //设置Caption为Transparant
Self.Color := clBlack; //设置窗体颜色为黑色，显示为正常状态
end
else //如果按钮的Caption为Transparant
begin
Self.Button1.Caption := 'Normal'; //设置Caption为Normal
Self.Color := Self.TransparentColorValue;//设置窗体颜色为窗体透明色，显示为透明状态
end;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
Self.Close;
end;
procedure TForm1.WMNCHitTest(var M: TWMNCHitTest);
begin
inherited;
if M.Result = htClient then
M.Result := htCaption;
end;
end.
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