125 lines
3.5 KiB
ObjectPascal
125 lines
3.5 KiB
ObjectPascal
{-----------------------------------------------------------------------------
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The contents of this file are subject to the Mozilla Public License
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Version 1.1 (the "License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.mozilla.org/MPL/MPL-1.1.html
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Software distributed under the License is distributed on an "AS IS" basis,
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WITHOUT WARRANTY OF ANY KIND, either expressed or implied. See the License for
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the specific language governing rights and limitations under the License.
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The Original Code is: JvAppCommand.PAS, released on 2005-09-02.
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The Initial Developer of the Original Code is Robert Marquardt [robert_marquardt att dmx dott de]
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Portions created by Robert Marquardt are Copyright (C) 2001 Robert Marquardt.
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All Rights Reserved.
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Contributor(s):
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You may retrieve the latest version of this file at the Project JEDI's JVCL home page,
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located at http://jvcl.sourceforge.net
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Known Issues:
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-----------------------------------------------------------------------------}
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// $Id: JvScreenSaveSuppress.pas 10612 2006-05-19 19:04:09Z jfudickar $
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unit JvScreenSaveSuppress;
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{$I jvcl.inc}
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interface
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uses
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{$IFDEF UNITVERSIONING}
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JclUnitVersioning,
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{$ENDIF UNITVERSIONING}
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Windows, Messages, SysUtils, Classes, Controls, Forms,
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JvComponentBase;
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const
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// from JwaWinUser.pas
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SC_SCREENSAVE = $F140;
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{$EXTERNALSYM SC_SCREENSAVE}
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type
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TJvScreenSaveEvent = procedure(var Handled: Boolean) of object;
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TJvScreenSaveSuppressor = class(TJvComponent)
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private
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FActive: Boolean;
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FOnScreenSave: TJvScreenSaveEvent;
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FForm: TCustomForm;
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function NewWndProc(var Msg: TMessage): Boolean;
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procedure SetActive(Value: Boolean);
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public
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constructor Create(AOwner: TComponent); override;
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destructor Destroy; override;
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published
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property Active: Boolean read FActive write SetActive default True;
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property OnScreenSave: TJvScreenSaveEvent read FOnScreenSave write FOnScreenSave;
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end;
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{$IFDEF UNITVERSIONING}
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const
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UnitVersioning: TUnitVersionInfo = (
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RCSfile: '$URL: https://jvcl.svn.sourceforge.net/svnroot/jvcl/tags/JVCL3_32/run/JvScreenSaveSuppress.pas $';
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Revision: '$Revision: 10612 $';
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Date: '$Date: 2006-05-19 21:04:09 +0200 (ven., 19 mai 2006) $';
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LogPath: 'JVCL\run'
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);
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{$ENDIF UNITVERSIONING}
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implementation
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uses
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JvWndProcHook;
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constructor TJvScreenSaveSuppressor.Create(AOwner: TComponent);
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begin
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inherited Create(AOwner);
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FForm := GetParentForm(TControl(AOwner));
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Active := True;
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end;
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destructor TJvScreenSaveSuppressor.Destroy;
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begin
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Active := False;
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inherited Destroy;
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end;
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procedure TJvScreenSaveSuppressor.SetActive(Value: Boolean);
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begin
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if FActive <> Value then
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begin
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FActive := Value;
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if (FForm <> nil) and not (csDesigning in ComponentState) then
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if Value then
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RegisterWndProcHook(FForm, NewWndProc, hoBeforeMsg)
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else
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UnregisterWndProcHook(FForm, NewWndProc, hoBeforeMsg);
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end;
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end;
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function TJvScreenSaveSuppressor.NewWndProc(var Msg: TMessage): Boolean;
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begin
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Result := False;
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if (Msg.Msg = WM_SYSCOMMAND) and (Msg.WParam = SC_SCREENSAVE) and Active then
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begin
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Result := True;
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if Assigned(FOnScreenSave) then
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FOnScreenSave(Result);
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Msg.Result := Ord(Result);
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end;
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end;
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{$IFDEF UNITVERSIONING}
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initialization
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RegisterUnitVersion(HInstance, UnitVersioning);
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finalization
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UnregisterUnitVersion(HInstance);
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{$ENDIF UNITVERSIONING}
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end.
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