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+/*************************************************************************
+ *
+ * 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