DELPHI中如何让FORM窗体透明，只显示控件？
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largewang
largewang
largewang
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#1 得分：5 回复于： 2002-12-17 13:58:37
procedure TForm1.FormCreate(Sender: TObject);
begin
BorderStyle := bsNone;
Brush.Style := bsClear;
end;

//保证你只看的到控件！！！
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wzrlover
wzrlover
wzrlover
等级：Blank
#2 得分：12 回复于： 2002-12-17 13:59:32
我想这是你需要的吧：

unit Unit1;

{The transparent form effect is done with Regions.
First create a region that encompasses the entire form.
Then, find the client area of the form (Client vs. non-Client) and
combine with the full region with RGN_DIFF to make the borders
and title bar visible. Then create a region for each of the
controls and combine them with the original (FullRgn) region.}

{From various posts in the newsgroups - based on some famous
author I'm sure, but I first saw the post by Kerstin Thaler...}

interface

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

type
TForm1 = class(TForm)
Button1: TButton;
Panel1: TPanel;
Button2: TButton;
procedure FormDestroy(Sender: TObject);
procedure FormCreate(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure FormResize(Sender: TObject);
private
{ Private declarations }
procedure DoVisible;
procedure DoInvisible;
public
{ Public declarations }
end;

var
Form1: TForm1;
FullRgn, ClientRgn, CtlRgn : THandle;

implementation

{$R *.DFM}

procedure TForm1.DoInvisible;
var
AControl : TControl;
A, Margin, X, Y, CtlX, CtlY : Integer;
begin
Margin := ( Width - ClientWidth ) div 2;
//First, get form region
FullRgn := CreateRectRgn(0, 0, Width, Height);
//Find client area region
X := Margin;
Y := Height - ClientHeight - Margin;
ClientRgn := CreateRectRgn( X, Y, X + ClientWidth, Y + ClientHeight );
//'Mask' out all but non-client areas
CombineRgn( FullRgn, FullRgn, ClientRgn, RGN_DIFF );

//Now, walk through all the controls on the form and 'OR' them
// into the existing Full region.
for A := 0 to ControlCount - 1 do begin
AControl := Controls[A];
if ( AControl is TWinControl ) or ( AControl is TGraphicControl )
then with AControl do begin
if Visible then begin
CtlX := X + Left;
CtlY := Y + Top;
CtlRgn := CreateRectRgn( CtlX, CtlY, CtlX + Width, CtlY + Height );
CombineRgn( FullRgn, FullRgn, CtlRgn, RGN_OR );
end;
end;
end;
//When the region is all ready, put it into effect:
SetWindowRgn(Handle, FullRgn, TRUE);
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
//Clean up the regions we created
DeleteObject(ClientRgn);
DeleteObject(FullRgn);
DeleteObject(CtlRgn);
end;

procedure TForm1.DoVisible;
begin
//To restore complete visibility:
FullRgn := CreateRectRgn(0, 0, Width, Height);
CombineRgn(FullRgn, FullRgn, FullRgn, RGN_COPY);
SetWindowRgn(Handle, FullRgn, TRUE);
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
//We start out as a transparent form....
DoInvisible;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
//This button just toggles between transparent and not trans..
if Button1.Caption = 'Show Form' then begin
DoVisible;
Button1.Caption := 'Hide Form';
end
else begin
DoInvisible;
Button1.Caption := 'Show Form';
end;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
Application.Terminate;
end;

procedure TForm1.FormResize(Sender: TObject);
begin

if Button1.Caption = 'Show Form' then
DoInvisible
else
DoVisible;
end;

end.
与她合影留念，致终将逝去的青春对我有用[1] 丢个板砖[0] 引用 | 举报 | 管理
Rensun
Rensun
Rensun
我试了，两种方法都可以实现，第一种比较简单，请问两种方法有什么区别呢？
（技术上）
用这个方法也可以
在interface的private里加入

PROCEDURE CMEraseBkgnd(var Message:TWMEraseBkgnd);Message WM_ERASEBKGND;

在implemetation里加入
PROCEDURE Tform1.CMEraseBkgnd(var Message:TWMEraseBkgnd);
BEGIN
brush.style:=bsClear;
Inherited;
END;