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Reading X,Y-pos while moving Form

Posted on 2000-02-16
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Last Modified: 2010-04-04
I'm trying to get the windows X,Y pos while moving the form.
The movement is initiated through performing wm_syscommand.
Like this:  form.Perform(WM_Syscommand,$F012,0);

I tried Using the WM_WindowPosChanging Message to read the pos, but i can't figure it out.

Any help appreciated

Raidos
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Question by:raidos
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11 Comments
 
LVL 3

Expert Comment

by:ckaneta
ID: 2528509
here's a hint, when you move a form it gets repainted, too
0
 
LVL 6

Expert Comment

by:edey
ID: 2528558
or you could trap the WM_MOVING message

GL
Mike
0
 
LVL 13

Expert Comment

by:Epsylon
ID: 2528578
Here it is:

type
  TForm1 = class(TForm)
  private
    { Private declarations }
    procedure Move(var Message: TWMChar); message WM_MOVE;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Move(var Message: TWMChar);
begin
  Caption := IntToStr(Left);
//  Caption := IntToStr(Top);
end;
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Expert Comment

by:edey
ID: 2528603
note, WM_MOVE is fired *after* the window has moved

GL
Mike
0
 
LVL 3

Author Comment

by:raidos
ID: 2528643
Hmm, thanks for your comments.

Allthough this is not really what i'm looking for.
I need to read the pos of the forms Outline that
gets displayed while moving the form

0
 
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Expert Comment

by:bryan7
ID: 2528667
listenning
0
 
LVL 3

Expert Comment

by:ckaneta
ID: 2528698
question: do you have it set up so a user can only drag from the titlebar or from anywhere on the form?

either way, I guess it would work the same, so here's another idea...
get the mousepos, save the forms top and left positions, and set a flag on an LButton down event, on a if the flag is set when you get a Move message, calculate the outlines top, and left from the forms old top and left from the current position of the mouse.

0
 
LVL 13

Expert Comment

by:Epsylon
ID: 2528785
Ahh... you have 'Show window contents while dragging' turned off.... right?
0
 
LVL 8

Expert Comment

by:ZifNab
ID: 2528797
euhm, why not using the WM_MOVING message?

Thus eventually the same solution as Epsylons, but use WM_MOVING instead of WM_MOVED...

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
  private
    { Private declarations }
  public
    { Public declarations }
  protected

 procedure FormMoving(var MSG : TMessage); message WM_MOVING ;

  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.FormMoving(var Msg: TMessage);
begin
  inherited;
  showmessage('New form position : '+inttostr(left)+','+inttostr(top));

end;


end.
0
 
LVL 3

Author Comment

by:raidos
ID: 2528929
Found a solution to my problem
I goes like so:

Procedure WMMoving(Var Message: TMessage);
Var
  Wpos : Prect;
Begin
  WPos := Pointer(Message.LParam);
  If WPos.Left < 10 then Begin
    WPos.Left := 0;
    WPos.Right := Form.Width;
  End;
  Inherited;
End;

Now, how should i post the points?
0
 
LVL 13

Accepted Solution

by:
Epsylon earned 100 total points
ID: 2531755
Just grade it  :o)
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