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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org 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 version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#ifndef _SVX_ACCESSIBILITY_IACCESSIBLE_VIEW_FORWARDER_HXX
#define _SVX_ACCESSIBILITY_IACCESSIBLE_VIEW_FORWARDER_HXX
#include <sal/types.h>
#include <tools/gen.hxx>
namespace accessibility {
/** <p>This interface provides the means to transform between internal
coordinates in 100th of mm and screen coordinates without giving direct
access to the underlying view. Each view forwarder represents a
specific real or virtual window. A call to
<method>GetVisibleArea</method> returns the visible rectangle that
corresponds to this window.</p>
<p>This interface is similar to the <type>SvxViewForwarder</type> but
differs in two important points: Firstly the <member>GetVisArea</member>
method returns a rectangle in internal coordinates and secondly the
transformation methods do not require explicit mapmodes. These have to
be provided implicitely by the classes that implement this
interface. A third, less important, difference are the additional
transfomation methods for sizes. The reasons for their existince are
convenience and improved performance.</p>
@attention
Note, that modifications of the underlying view that lead to
different transformations between internal and screen coordinates or
change the validity of the forwarder have to be signaled seperately.
*/
class IAccessibleViewForwarder
{
public:
virtual ~IAccessibleViewForwarder (void){};
/** This method informs you about the state of the forwarder. Do not
use it when the returned value is <false/>.
@return
Return <true/> if the view forwarder is valid and <false/> else.
*/
virtual sal_Bool IsValid (void) const = 0;
/** Returns the area of the underlying document that is visible in the
* corresponding window.
@return
The rectangle of the visible part of the document. The values
are, contrary to the base class, in internal coordinates of
100th of mm.
*/
virtual Rectangle GetVisibleArea() const = 0;
/** Transform the specified point from internal coordinates in 100th of
mm to an absolute screen position.
@param rPoint
Point in internal coordinates (100th of mm).
@return
The same point but in screen coordinates relative to the upper
left corner of the (current) screen.
*/
virtual Point LogicToPixel (const Point& rPoint) const = 0;
/** Transform the specified size from internal coordinates in 100th of
mm to a screen oriented pixel size.
@param rSize
Size in internal coordinates (100th of mm).
@return
The same size but in screen coordinates.
*/
virtual Size LogicToPixel (const Size& rSize) const = 0;
/** Transform the specified point from absolute screen coordinates to
internal coordinates (100th of mm).
@param rPoint
Point in screen coordinates relative to the upper left corner of
the (current) screen.
@return
The same point but in internal coordinates (100th of mm).
*/
virtual Point PixelToLogic (const Point& rPoint) const = 0;
/** Transform the specified size from screen coordinates to internal
coordinates (100th of mm).
@param rSize
Size in screen coordinates.
@return
The same size but in internal coordinates (100th of mm).
*/
virtual Size PixelToLogic (const Size& rSize) const = 0;
};
} // end of namespace accessibility
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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