libs/textlayout/FloatingAnchorStrategy.h

0001 /* This file is part of the KDE project
0002  * Copyright (C) 2007, 2009, 2010 Thomas Zander <zander@kde.org>
0003  * Copyright (C) 2011 Matus Hanzes <matus.hanzes@ixonos.com>
0004  *
0005  * This library is free software; you can redistribute it and/or
0006  * modify it under the terms of the GNU Library General Public
0007  * License as published by the Free Software Foundation; either
0008  * version 2 of the License, or (at your option) any later version.
0009  *
0010  * This library is distributed in the hope that it will be useful,
0011  * but WITHOUT ANY WARRANTY; without even the implied warranty of
0012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
0013  * Library General Public License for more details.
0014  *
0015  * You should have received a copy of the GNU Library General Public License
0016  * along with this library; see the file COPYING.LIB.  If not, write to
0017  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
0018  * Boston, MA 02110-1301, USA.
0019  */
0020
0021 #ifndef FLOATINGANCHORSTRATEGY_H
0022 #define FLOATINGANCHORSTRATEGY_H
0023
0024 #include "AnchorStrategy.h"
0025
0026 class KoTextLayoutRootArea;
0027 class KoTextShapeData;
0028 class QTextBlock;
0029 class QTextLayout;
0030 class KoTextLayoutObstruction;
0031 class KoAnchorTextRange;
0032
0033 class FloatingAnchorStrategy  : public AnchorStrategy
0034 {
0035 public:
0036     FloatingAnchorStrategy(KoAnchorTextRange *anchor, KoTextLayoutRootArea *rootArea);
0037     ~FloatingAnchorStrategy() override;
0038
0039     /**
0040      * This moves the subject (i.e. shape when used with flake) of the anchor.
0041      *
0042      * @return true if subject was moved
0043      */
0044     bool moveSubject() override;
0045
0046 private:
0047
0048     inline bool countHorizontalRel(QRectF &anchorBoundingRect, const QRectF &containerBoundingRect,
0049                                    QTextBlock &block, QTextLayout *layout);
0050     inline void countHorizontalPos(QPointF &newPosition, const QRectF &anchorBoundingRect);
0051     inline bool countVerticalRel(QRectF &anchorBoundingRect, const QRectF &containerBoundingRect,
0052                                  KoTextShapeData *data, QTextBlock &block, QTextLayout *layout);
0053     inline void countVerticalPos(QPointF &newPosition, const QRectF &anchorBoundingRect);
0054
0055     //check the layout environment and move the shape back to have it within
0056     inline void checkLayoutEnvironment(QPointF &newPosition, KoTextShapeData *data);
0057     //check the border of page and move the shape back to have it visible
0058     inline void checkPageBorder(QPointF &newPosition);
0059     //check stacking and reorder to proper position objects according to there z-index
0060     inline void checkStacking(QPointF &newPosition);
0061
0062     void updateObstruction(qreal documentOffset);
0063
0064     KoTextLayoutObstruction *m_obstruction; // the obstruction representation of the subject
0065     KoAnchorTextRange *m_anchorRange;
0066 };
0067
0068 #endif // FLOATINGANCHORSTRATEGY_H