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/*************************************************************************
*
* $RCSfile: outdevprovider.hxx,v $
*
* $Revision: 1.2 $
*
* last change: $Author: thb $ $Date: 2004-03-18 10:38:43 $
*
* The Contents of this file are made available subject to the terms of
* either of the following licenses
*
* - GNU Lesser General Public License Version 2.1
* - Sun Industry Standards Source License Version 1.1
*
* Sun Microsystems Inc., October, 2000
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2000 by Sun Microsystems, Inc.
* 901 San Antonio Road, Palo Alto, CA 94303, USA
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*
* Sun Industry Standards Source License Version 1.1
* =================================================
* The contents of this file are subject to the Sun Industry Standards
* Source 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.openoffice.org/license.html.
*
* Software provided under this License is provided on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
* WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
* MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
* See the License for the specific provisions governing your rights and
* obligations concerning the Software.
*
* The Initial Developer of the Original Code is: Sun Microsystems, Inc.
*
* Copyright: 2000 by Sun Microsystems, Inc.
*
* All Rights Reserved.
*
* Contributor(s): _______________________________________
*
*
************************************************************************/
#ifndef _VCLCANVAS_OUTDEVPROVIDER_HXX
#define _VCLCANVAS_OUTDEVPROVIDER_HXX
#ifndef _COMPHELPER_IMPLEMENTATIONREFERENCE_HXX
#include <comphelper/implementationreference.hxx>
#endif
#ifndef _DRAFTS_COM_SUN_STAR_RENDERING_XCANVAS_HPP_
#include <drafts/com/sun/star/rendering/XCanvas.hpp>
#endif
class OutputDevice;
namespace vclcanvas
{
/* Definition of OutDevProvider interface */
/** Helper interface to connect CanvasBase with its various
clients.
*/
// The problem here is the fact that first of all, XCanvas and its
// specialised interfaces form an inheritance hierarchy. Thus,
// every client of a base class implementing the commons of
// canvases, will have to implement all interface methods, and
// forward them to the base class. Thus, there's no real gain in
// using implementation inheritance here. If we instead use a
// helper class to be held as a member by its client, we have the
// problem that several base methods serve as object factories,
// generating objects which require links to the canvas
// implementation object _and_ a UNO reference. The latter is for
// lifetime issues, and should better be directly from the client
// object.
// Therefore, every client of CanvasBase must implement this
// interface and pass a pointer to it to the CanvasBase
// instance. The XInterface base class is necessary to have basic
// UNO reference semantics.
class OutDevProvider : public ::com::sun::star::uno::XInterface
{
public:
/** Use this type to store a C++ pointer alongside a UNO
reference to this interface.
This is advantageous e.g. for CanvasBase, where several
helper methods (color conversion etc.) need access to the
XCanvas UNO interface. Performing a QueryInterface
everytime is a real performance killer there.
*/
typedef ::comphelper::ImplementationReference<
OutDevProvider,
::drafts::com::sun::star::rendering::XCanvas,
::com::sun::star::uno::XInterface > ImplRef;
virtual ~OutDevProvider() {}
virtual OutputDevice& getOutDev() = 0;
virtual const OutputDevice& getOutDev() const = 0;
};
}
#endif /* _VCLCANVAS_OUTDEVPROVIDER_HXX */
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