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Better moving form

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Submitted on: 11/14/2001 3:14:27 AM
By: Mark van Renswoude  
Level: Beginner
User Rating: By 2 Users
Compatibility:Delphi 5, Delphi 4, Pre Delphi 4

Users have accessed this article 4693 times.
 

 
     While looking at somebody else's code, I noticed he was doing all sorts of stuff with the MouseDown and MouseMove events. Here's a better way, it captures the WM_NCHITTEST message which Windows sends to make Windows think the user is clicking on the titlebar, thus moving the form...

 
 
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unit Unit1;

interface

uses
  Windows,
  Messages,
  Forms;

type
  TForm1 = class(TForm)
  protected
    procedure WMNCHitTest(var Msg: TWMNCHitTest); message WM_NCHITTEST;
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.WMNCHitTest(var Msg: TWMNCHitTest);
begin
  // Call default procedure
  inherited;

  // Modify result to make windows think we're
  // clicking on the titlebar when we're actually
  // clicking on the client area...

  if Msg.Result = HTCLIENT then
    Msg.Result := HTCAPTION;
end;

end.


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Other User Comments
11/20/2001 12:59:11 PM:Paul Harrison
What a wonderful explanation! About 6 or 7 concepts are explained with 1 (oops, 2) lines of code. Excellent
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8/5/2002 12:11:25 PM:Earl
Thank you. I was about to do that MouseXXX thing too. This is MUCH cleaner and simpler.
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10/17/2002 8:29:21 AM:Jason Myerscough
How could I make this code work when I click an image? instead of the form?
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3/17/2003 4:45:54 PM:
How would i be able to test when a user RIGHT clicks on the title bar only? thus then displaying a POPUPMENU when the user has done so?
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