article

Better moving form

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Submitted on: 1/1/2015 8:06:00 AM
By: Mark van Renswoude (from psc cd)  
Level: Beginner
User Rating: By 3 Users
Compatibility: Delphi 5, Delphi 4, Pre Delphi 4
Views: 2179
 
     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...

 
				
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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