/* This file is part of the KDE project
   Copyright 2006-2007 Stefan Nikolaus <stefan.nikolaus@kdemail.net>
   Copyright 2004 Tomas Mecir <mecirt@gmail.com>
   Copyright 1999-2002,2004 Laurent Montel <montel@kde.org>
   Copyright 2002,2004 Ariya Hidayat <ariya@kde.org>
   Copyright 2002-2003 Norbert Andres <nandres@web.de>
   Copyright 2003 Stefan Hetzl <shetzl@chello.at>
   Copyright 2001-2002 Philipp Mueller <philipp.mueller@gmx.de>
   Copyright 2002 Harri Porten <porten@kde.org>
   Copyright 2002 John Dailey <dailey@vt.edu>
   Copyright 1999-2001 David Faure <faure@kde.org>
   Copyright 2000-2001 Werner Trobin <trobin@kde.org>
   Copyright 2000 Simon Hausmann <hausmann@kde.org
   Copyright 1998-1999 Torben Weis <weis@kde.org>
   Copyright 1999 Michael Reiher <michael.reiher@gmx.de>
   Copyright 1999 Reginald Stadlbauer <reggie@kde.org>

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; only
   version 2 of the License.

   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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.
*/

#ifndef CALLIGRA_SHEETS_CELL_VIEW
#define CALLIGRA_SHEETS_CELL_VIEW

// Qt
#include <QExplicitlySharedDataPointer>

// Sheets
#include "Global.h"
#include "Style.h"
#include "sheets_common_export.h"

class QFontMetricsF;
class QRectF;

namespace Calligra
{
namespace Sheets
{
class Cell;
class Sheet;
class SheetView;
class Style;

/**
 * \ingroup Painting
 * Responsible for the painting of Cell.
 * For each visible Cell exists a CellView, which is cached in the
 * corresponding SheetView. If the content of a Cell has changed, the CellView
 * will be destroyed and a new one will be created.
 */
class CALLIGRA_SHEETS_COMMON_EXPORT CellView
{
    friend class SheetView;
    friend class PixmapCachingSheetView;

public:
    CellView(SheetView* sheetView, int col, int row);
    CellView(const CellView& other);
    virtual ~CellView();
    CellView& operator=(const CellView& other);

    enum Border {
        NoBorder     = 0x0,
        LeftBorder   = 0x1,
        RightBorder  = 0x2,
        TopBorder    = 0x4,
        BottomBorder = 0x8
    };
    Q_DECLARE_FLAGS(Borders, Border)

    /**
     * \return the style for the cell associated with this view
     */
    Style style() const;

    /**
     * Paints the cell's background.
     * \param painter the used painter
     * \param coordinate the top left coordinate (scroll offset dependent)
     */
    void paintCellBackground(QPainter& painter, const QRegion &clipRegion, const QPointF& coordinate) const;

    /**
     * Paints the cell.
     * \param paintRegion the portion of the canvas that is actually in view
     * \param painter the used painter
     * \param coordinate the top left coordinate (scroll offset dependent)
     * \param cell the Cell
     */
    virtual void paintCellContents(const QRectF& paintRegion, QPainter& painter, const QRegion &clipRegion,
                           const QPointF& coordinate,
                           const Cell& cell, SheetView* sheetView) const;

    /**
     * Paints the cell custom borders, the page borders, diagonal lines.
     * \param paintRegion the portion of the canvas that is actually in view
     * \param painter the used painter
     * \param coordinate the top left coordinate (scroll offset dependent)
     * \param cellRange the cell range, that is painted
     * \param cell the Cell
     * \param sheetView the SheetView
     */
    void paintCellBorders(const QRectF& paintRegion, QPainter& painter, const QRegion &clipRegion,
                          const QPointF& coordinate,
                          const QRect& cellRange,
                          const Cell& cell, SheetView* sheetView) const;

    /**
     * Paints the default cell borders.
     * \param painter the used painter
     * \param paintRegion the portion of the canvas that is actually in view
     * \param coordinate the painting coordinate
     * \param paintBorder the borders, that should be painted (should be removed???)
     * \param cellRange the cell range, that is painted
     * \param cell the Cell
     * \param sheetView the SheetView
     */
    void paintDefaultBorders(QPainter& painter, const QRegion &clipRegion, const QRectF &paintRegion,
                             const QPointF& coordinate,
                             Borders paintBorder, const QRect& cellRange,
                             const Cell& cell, SheetView* sheetView) const;

    /**
     * \return width of the text
     */
    qreal textWidth() const;

    /**
     * \return height of the text
     */
    qreal textHeight() const;

    /**
     * \return the rectangle the text covers
     */
    QRectF textRect() const;

    QString testAnchor(SheetView* sheetView, const Cell& cell, qreal x, qreal y) const;

    bool hitTestFilterButton(const Cell& cell, const QRect& cellRect, const QPoint& position) const;

    qreal cellHeight() const;
    qreal cellWidth() const;

    bool dimensionFits() const;

    void detach();
protected:
    /**
     * \ingroup Layout
     * Calculates the layout of the cell.
     *
     * I.e. recalculates the text to be shown, its dimensions, its offset,
     * breaks lines of the text to fit it into the cell, obscures neighbouring
     * cells, if necessary.
     */
    void makeLayout(SheetView* sheetView, const Cell& cell);

    /**
     * \ingroup Layout
     * Determines the text offset relative to the cell's top left corner.
     *
     * This depends on the following variables:
     * \li horizontal alignment
     * \li vertical alignment
     * \li text angle
     * \li text direction (horizontal or vertical)
     * \li text width and height
     * \li single or multiple rows
     * \li cell width and height, including obscured cells
     * \li thickness of the border pens
     *
     * \internal Called from makeLayout().
     */
    void textOffset(const QFontMetricsF& fontMetrics, const Cell& cell);

    /**
     * \ingroup Layout
     * Determines the dimension of this cell including any merged cells.
     * Does NOT consider space, which is available from empty neighbours,
     * and would be able to be obscured.
     *
     * \internal Called from makeLayout().
     */
    void calculateCellDimension(const Cell& cell);

    /**
     * \ingroup Layout
     * Checks, whether horizontal neighbours could be obscured
     * and does so, if necessary.
     *
     * \internal Called from makeLayout().
     */
    void obscureHorizontalCells(SheetView* sheetView, const Cell& cell);

    /**
     * \ingroup Layout
     * Checks, whether vertical neighbours could be obscured
     * and does so, if necessary.
     *
     * \internal Called from makeLayout().
     */
    void obscureVerticalCells(SheetView* sheetView, const Cell& cell);

    /**
     * Adjust the output text, so that it only holds the part that can be
     * displayed. The altered text is only temporary stored. It is restored
     * after the paint event has been processed.
     *
     * This depends on the following variables:
     * \li horizontal alignment
     * \li value format
     * \li text direction (horizontal or vertical)
     * \li indentation
     *
     * \internal Called from paintText().
     */
    QString textDisplaying(const QFontMetricsF& fontMetrics, const Cell& cell);

    /**
     * helper function for paintCell() function
     * @see paintCell()
     * @internal
     */
    void paintCustomBorders(QPainter& painter, const QRectF &paintRegion,
                            const QPointF& coordinate, Borders paintBorder,
                            bool rtl) const;

    /**
     * helper function for paintCell() function
     * @see paintCell()
     * @internal
     */
    void paintPageBorders(QPainter& painter, const QPointF &coordinate,
                          Borders paintBorder, const Cell& cell) const;

    /**
     * helper function for paintCell() function
     * @see paintCell()
     * @internal
     */
    void paintText(QPainter& painter, const QPointF& coordinate, const Cell& cell) const;

    /**
     * helper function for paintCell() function
     * @see paintCell()
     * @internal
     */
    void paintMoreTextIndicator(QPainter& painter, const QPointF& coordinate) const;

    /**
     * helper function for paintCell() function
     * @see paintCell()
     * @internal
     */
    void paintCommentIndicator(QPainter& painter, const QPointF& coordinate,
                               const Cell& cell) const;

    /**
     * helper function for paintCell() function
     * @see paintCell()
     * @internal
     */
    void paintFormulaIndicator(QPainter& painter, const QPointF& coordinate, const Cell& cell) const;

    /**
     * helper function for paintCell() function
     * @see paintCell()
     * @internal
     */
    void paintMatrixElementIndicator(QPainter& painter, const QPointF& coordinate, const Cell& cell) const;

    /**
     * helper function for paintCell() function
     * @see paintCell()
     * @internal
     */
    void paintCellDiagonalLines(QPainter& painter, const QPointF& coordinate) const;

    /**
     * helper function for paintCell() function
     * @see paintCell()
     * @internal
     */
    void paintFilterButton(QPainter& painter, const QPointF& coordinate,
                           const Cell& cell, SheetView* sheetView) const;

    void drawText(QPainter& painter, const QPointF& location, const QStringList& textLines,
                  const Cell& cell, qreal lineSpacing = 0) const;

    /**
     * Default CellView used by SheetView.
     */
    CellView(SheetView* sheetView);

    class Private;
    QExplicitlySharedDataPointer<Private> d;
};

Q_DECLARE_OPERATORS_FOR_FLAGS(CellView::Borders)

} // namespace Sheets
} // namespace Calligra

Q_DECLARE_TYPEINFO(Calligra::Sheets::CellView, Q_MOVABLE_TYPE);

#endif
