• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 266
  • Last Modified:

Transparently Form?

How to make the Form1 transparent?
0
rozanek
Asked:
rozanek
  • 2
  • 2
  • 2
  • +3
1 Solution
 
erajojCommented:
Hi, is this what you want?:

procedure TForm1.FormCreate(Sender: TObject);
begin
  Canvas.Brush.Style := bsClear;
end;

/// John
0
 
bryanphillipsCommented:
I don't remember where I got this information. I have tried to locate information about the author but it is not included in the comments. I appologize to whomever it was and hope that he/she gets credit but everyone should include their name in any publicly available code if they want credit.

That aside, here is one way of doing it:

1) Add a new function to your form definition called Disappear:

procedure TForm1.Disappear;
 Var
   frmRegion, tempRegion: HRGN;
   i: Integer;
   Arect: TRect;
 Begin
   frmRegion := 0;
   For I:= 0 To ControlCount - 1 Do Begin
     // create a region for the control
     aRect := Controls[i].BoundsRect;
     // coordinates have to be window-relative, not client area
     // relative
     OffsetRect( aRect, clientorigin.x - left, clientorigin.y - top );
     tempRegion := CreateRectRgnIndirect( aRect );
     // merge the region with the "summary" region we are
     // building
     If frmRegion = 0 Then
       frmRegion := tempRegion
     Else Begin
       CombineRgn( frmRegion, frmRegion, tempRegion, RGN_OR );
       DeleteObject( tempRegion );
     End;
   End;
   // To create a region for the caption and menu bar and add it
   // to the summary, uncomment this section of code.
{   tempregion :=
     CreateRectRgn( 0, 0, Width,
                    GetSystemMetrics( SM_CYCAPTION )+
                    GetSystemMetrics( SM_CYSIZEFRAME )+
                    GetSystemMetrics( SM_CYMENU ));

   CombineRgn( frmRegion, frmRegion, tempRegion, RGN_OR );
   DeleteObject( tempRegion );
}
   SetWindowRgn( handle, frmRegion, true );
 End;


2) Call this function whenever you want the form to DISAPPEAR! All that's left behind are the visible components.
0
 
erajojCommented:
Bryan, your code doesn't make the form transparent, it makes a BIG HOLE IN IT!

/// John
0
Concerto Cloud for Software Providers & ISVs

Can Concerto Cloud Services help you focus on evolving your application offerings, while delivering the best cloud experience to your customers? From DevOps to revenue models and customer support, the answer is yes!

Learn how Concerto can help you.

 
viktornetCommented:
John's right y'all :)))

Cheers,
Viktor
0
 
ThaddyCommented:
But this will make the border disappear as well:
procedure TForm1.FormCreate(Sender: TObject);
begin
  Form1.Canvas.Brush.Style := bsClear;
  Form1.Borderstyle:=bsNone;//Yup!, Gone
end;

0
 
viktornetCommented:
C'mon Thaddy Bear :)
0
 
bryanphillipsCommented:
I guess I was confused as to what you wanted. Sorry :).
0
 
bryan7Commented:
Use this to toggle transparent/normal


Drop a panel and 2 buttons to the form and use this:



            unit Unit1;

            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;
              Button1.Caption := 'Hide Form';
            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.

( don't forget to double click on the object inspector events for buttonclick and form create, resize and destroy )

bryan

0
 
rozanekAuthor Commented:
Thank you for help, friend.
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

  • 2
  • 2
  • 2
  • +3
Tackle projects and never again get stuck behind a technical roadblock.
Join Now