jvqeasteregg.pas

East make Tray Icon in delphi

{******************************************************************************}
{* WARNING:  JEDI VCL To CLX Converter generated unit.                        *}
{*           Manual modifications will be lost on next release.               *}
{******************************************************************************}

{-----------------------------------------------------------------------------
The contents of this file are subject to the Mozilla Public License
Version 1.1 (the "License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.mozilla.org/MPL/MPL-1.1.html

Software distributed under the License is distributed on an "AS IS" basis,
WITHOUT WARRANTY OF ANY KIND, either expressed or implied. See the License for
the specific language governing rights and limitations under the License.

The Original Code is: JvEasterEgg.PAS, released on 2001-02-28.

The Initial Developer of the Original Code is S閎astien Buysse [sbuysse att buypin dott com]
Portions created by S閎astien Buysse are Copyright (C) 2001 S閎astien Buysse.
All Rights Reserved.

Contributor(s): Michael Beck [mbeck att bigfoot dott com].

You may retrieve the latest version of this file at the Project JEDI's JVCL home page,
located at http://jvcl.sourceforge.net

Known Issues:
-----------------------------------------------------------------------------}
// $Id: JvQEasterEgg.pas,v 1.15 2004/12/01 22:53:16 asnepvangers Exp $

unit JvQEasterEgg;

{$I jvcl.inc}

interface

uses 
  Qt, 
  QWindows, QMessages, SysUtils, Classes, QControls, QForms,
  JvQComponent;

type
  TJvEasterEgg = class(TJvComponent)
  private
    FActive: Boolean;
    FEventHook: QApplication_hookH;
    FOnEggFound: TNotifyEvent;
    FControlKeys: TShiftState;
    FEgg: string;
    FForm: TCustomForm;
    FCurString: string;
//    FHook: string;
    function NewEventFilter(Sender: QObjectH; Event: QEventH): Boolean; cdecl;
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
  published
    property Active: Boolean read FActive write FActive default True;
    property Egg: string read FEgg write FEgg;
    property ControlKeys: TShiftState read FControlKeys write FControlKeys default [ssAlt];
    property OnEggFound: TNotifyEvent read FOnEggFound write FOnEggFound;
  end;

implementation

function DownCase(Ch: Char): Char;
begin
  Result := Ch;
  case Result of
    'A'..'Z':
      Inc(Result, Ord('a') - Ord('A'));
  end;
end;

constructor TJvEasterEgg.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  FActive := True;
  FControlKeys := [ssAlt];
  FForm := GetParentForm(TControl(AOwner));
  if (FForm <> nil) and not (csDesigning in ComponentState) then
    FEventHook := InstallApplicationEventHook(NewEventFilter);
end;

destructor TJvEasterEgg.Destroy;
begin
  if assigned(FEventHook) then
    QApplication_hook_destroy(FEventHook);
  inherited Destroy;
end;

function TJvEasterEgg.NewEventFilter(Sender: QObjectH; Event: QEventH): Boolean;
var
  Shift: TShiftState;
  KeyCode: Word;
  KeyChar: Char;
begin
  Result := False;
  if Active and (FEgg <> '') and (QEvent_type(Event) = QEventType_KeyRelease) then
  begin
    KeyCode := QKeyEvent_key(QKeyEventH(Event));
    KeyChar := Char(QKeyEvent_ascii(QKeyEventH(Event)));
    Shift := ButtonStateToShiftState(QKeyEvent_state(QKeyEventH(Event)));
    if (KeyCode = Key_Shift) then
      Include(Shift, ssShift);
    if (KeyCode = Key_Control) then
      Include(Shift, ssCtrl);
    if (KeyCode = Key_Alt) then
      Include(Shift, ssAlt);

    if Shift = FControlKeys then
    begin
      if ssShift in Shift then
        FCurString := FCurString + UpCase(KeyChar)
      else
        FCurString := FCurString + DownCase(KeyChar);
      if FCurString = Egg then
      begin
        if Assigned(FOnEggFound) then
          FOnEggFound(Self);
        FCurString := '';
      end
      else
      if Length(FCurString) >= Length(Egg) then
        FCurString := Copy(FCurString, 2, Length(Egg));
    end;
  end;
end;


{$IFDEF UNITVERSIONING}
const
  UnitVersioning: TUnitVersionInfo = (
    RCSfile: '$RCSfile: JvQEasterEgg.pas,v $';
    Revision: '$Revision: 1.15 $';
    Date: '$Date: 2004/12/01 22:53:16 $';
    LogPath: 'JVCL\run'
  );

initialization
  RegisterUnitVersion(HInstance, UnitVersioning);

finalization
  UnregisterUnitVersion(HInstance);
{$ENDIF UNITVERSIONING}

end.