Mega Code Archive
Drag the form by the client area, NOT the title bar
<![CDATA[
Title: Drag the form by the client area, NOT the title bar
This lets the user drag the form by the client area, but not the title bar.
To mannually disable such dragging, set Form1.AllowDrag to false.
To enable draggin, set the property to true.
---------------------------------------
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs;
type
TForm1 = class(TForm)
procedure FormMouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
procedure FormMouseMove(Sender: TObject; Shift: TShiftState; X,
Y: Integer);
procedure FormMouseUp(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
FDownPoint: TPoint;
FDragging: Boolean;
FAllowDrag: Boolean;
published
{ Public declarations }
property AllowDrag: Boolean read FAllowDrag write FAllowDrag;
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.FormMouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
if Button = mbLeft then
begin
FDragging := True;
GetCursorPos(FDownPoint);
FDownPoint.X := FDownPoint.X - Self.Left;
FDownPoint.Y := FDownPoint.Y - Self.Top;
end;
end;
procedure TForm1.FormMouseMove(Sender: TObject; Shift: TShiftState; X,
Y: Integer);
var MovePoint: TPoint;
begin
if FDragging and FAllowDrag then
begin
GetCursorPos(MovePoint);
Self.SetBounds(
MovePoint.X - FDownPoint.X,
MovePoint.Y - FDownPoint.Y,
Self.Width, Self.Height
);
end;
end;
procedure TForm1.FormMouseUp(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
if Button = mbLeft then
FDragging := False;
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
FAllowDrag := True;
end;
end.
]]>