抄来的
**************************
To make a form transparent you should put these 2 lines in form's creation procedure:procedure TForm1.FormCreate(Sender: TObject);
begin
Form1.Brush.Style:=bsClear;
Form1.BorderStyle:=bsNone;
end;If you use only that you will notice that the form is transparent but if you put something
over it, it will not clear its own background and traces of that object will be left on the
form. To solve that you need to make sure that the transparent form's Paint procedure (WM_PAINT)
will be called last. To do that you need to override the TWinControl (TForm's ancestor)
CreateParams procedure and set the Form's extended style (ExStyle) to WS_EX_TRANSPARENT.Here's the full code for making a form transparent:type
TForm1 = class(TForm)
procedure CreateParams(var Params:TCreateParams); override;
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;var
Form1: TForm1;implementation{$R *.DFM}procedure TForm1.CreateParams(var Params:TCreateParams);
Begin
inherited CreateParams(Params);
Params.ExStyle:=WS_EX_TRANSPARENT;
End;procedure TForm1.FormCreate(Sender: TObject);
begin
Form1.Brush.Style:=bsClear;
Form1.BorderStyle:=bsNone;
end;
**************************
To make a form transparent you should put these 2 lines in form's creation procedure:procedure TForm1.FormCreate(Sender: TObject);
begin
Form1.Brush.Style:=bsClear;
Form1.BorderStyle:=bsNone;
end;If you use only that you will notice that the form is transparent but if you put something
over it, it will not clear its own background and traces of that object will be left on the
form. To solve that you need to make sure that the transparent form's Paint procedure (WM_PAINT)
will be called last. To do that you need to override the TWinControl (TForm's ancestor)
CreateParams procedure and set the Form's extended style (ExStyle) to WS_EX_TRANSPARENT.Here's the full code for making a form transparent:type
TForm1 = class(TForm)
procedure CreateParams(var Params:TCreateParams); override;
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;var
Form1: TForm1;implementation{$R *.DFM}procedure TForm1.CreateParams(var Params:TCreateParams);
Begin
inherited CreateParams(Params);
Params.ExStyle:=WS_EX_TRANSPARENT;
End;procedure TForm1.FormCreate(Sender: TObject);
begin
Form1.Brush.Style:=bsClear;
Form1.BorderStyle:=bsNone;
end;
begin
Margin := ( Width - ClientWidth ) div 2;
FullRgn := CreateRectRgn(0, 0, Width, Height);
X := Margin;
Y := Height - ClientHeight - Margin;
ClientRgn := CreateRectRgn( X, Y, X + Width, Y + Height );
CombineRgn( FullRgn, FullRgn, ClientRgn, RGN_DIFF );
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;
SetWindowRgn(Handle, FullRgn, TRUE);
end;
to vb_delphi(Iwantc):
你可真绝呀!连标题栏都被你隐藏了,怎么移动呀?
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
//Need to address the transparency if the form gets re-sized.
//Also, note that Form1 scroll bars are set to VISIBLE/FALSE.
//I did that to save a little coding here....
if Button1.Caption = 'Show Form' then
DoInvisible
else
DoVisible;
end; end.
to TechnoFantasy(www.applevb.com):高手,搞定!
var margin,x,y,a,ctlx,ctly:integer;
fullrgn,clientrgn,ctlrgn:hrgn;
acontrol:tcontrol;
to vb_delphi(Iwantc):
这下对了!
要是在透明窗口中加一个lable,怎样使lable背景透明?答出来了另行加分!
但是它总被上面窗体覆盖