/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*

 * This file is part of the LibreOffice project.

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 *

 * This file incorporates work covered by the following license notice:

 *

 *   Licensed to the Apache Software Foundation (ASF) under one or more

 *   contributor license agreements. See the NOTICE file distributed

 *   with this work for additional information regarding copyright

 *   ownership. The ASF licenses this file to you under the Apache

 *   License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 .

 */

#ifndef INCLUDED_SVX_IACCESSIBLEVIEWFORWARDER_HXX

#define INCLUDED_SVX_IACCESSIBLEVIEWFORWARDER_HXX

#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 SvxViewForwarder 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 implicitly by the classes that implement this

    interface.  A third, less important, difference are the additional

    transformation methods for sizes.  The reasons for their existence 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 separately.

*/

class IAccessibleViewForwarder

{

public:

    IAccessibleViewForwarder() = default;

    IAccessibleViewForwarder(IAccessibleViewForwarder const&) = default;

    IAccessibleViewForwarder(IAccessibleViewForwarder&&) = default;

    IAccessibleViewForwarder& operator=(IAccessibleViewForwarder const&) = default;

    IAccessibleViewForwarder& operator=(IAccessibleViewForwarder&&) = default;

    virtual ~IAccessibleViewForwarder(){};

    /** 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 tools::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;

};

} // end of namespace accessibility

#endif

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