Delphi F11 全屏

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    procedure FormKeyDown(Sender: TObject; var Key: Word;
      Shift: TShiftState);
  private
    { Private declarations }
  public
    { Public declarations }
    OriginalBounds: TRect;
    OriginalWindowState: TWindowState;
    ScreenBounds: TRect;
    procedure SwitchFullScreen;
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormKeyDown(Sender: TObject; var Key: Word;
  Shift: TShiftState);
const
  KeyF11 = 122;
begin
  if Key = KeyF11 then SwitchFullScreen;
end;
 
procedure TForm1.SwitchFullScreen;
begin
  if BorderStyle <> bsNone then begin
    // To full screen
    OriginalWindowState := WindowState;
    OriginalBounds := BoundsRect;
 
    BorderStyle := bsNone;
    ScreenBounds := Screen.MonitorFromWindow(Handle).BoundsRect;
    with ScreenBounds do
      SetBounds(Left, Top, Right - Left, Bottom - Top) ;
  end else begin
    // From full screen
    {$IFDEF MSWINDOWS}
    BorderStyle := bsSizeable;
    {$ENDIF}      
    if OriginalWindowState = wsMaximized then
      WindowState := wsMaximized
    else
      with OriginalBounds do
        SetBounds(Left, Top, Right - Left, Bottom - Top) ;
    {$IFDEF LINUX}
    BorderStyle := bsSizeable;
    {$ENDIF}  
  end;
end;

end.