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timer1.Interval 设置为5最好
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, ComCtrls, ExtCtrls,Math, StdCtrls;
type
TForm1 = class(TForm)
Timer1: TTimer;
Label1: TLabel;
procedure Timer1Timer(Sender: TObject);
private
FAnchors: TAnchors;
procedure WMMOVING(var Msg: TMessage);message WM_MOVING;
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.WMMOVING(var Msg: TMessage);
begin
inherited;
with PRect(Msg.LParam)^ do
begin
Left := Min(Max(0, Left), Screen.Width - Width);
Top := Min(Max(0, Top), Screen.Height - Height);
Right := Min(Max(Width, Right), Screen.Width);
Bottom := Min(Max(Height, Bottom), Screen.Height);
FAnchors := [];
if Left = 0 then Include(FAnchors, akLeft);
if Right = Screen.Width then
Include(FAnchors, akRight);
if Top = 0 then Include(FAnchors, akTop);
if Bottom = Screen.Height then
Include(FAnchors, akBottom);
Timer1.Enabled := FAnchors <> [];
end;
end;
procedure TForm1.Timer1Timer(Sender: TObject);
const
cOffset = 2;
begin
if WindowFromPoint(Mouse.CursorPos) = Handle then
begin
if akLeft in FAnchors then Left := 0;
if akTop in FAnchors then Top := 0;
if akRight in FAnchors then
Left := Screen.Width - Width;
if akBottom in FAnchors then
Top := Screen.Height - Height;
end else
begin
if akLeft in FAnchors then Left := -Width + cOffset;
if akTop in FAnchors then Top := -Height + cOffset;
if akRight in FAnchors then
Left := Screen.Width - cOffset;
if akBottom in FAnchors then
Top := Screen.Height - cOffset;
end;
end;
end.
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