/* This file is part of the KDE project
   Copyright (C) 2001 David Faure <faure@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; either
   version 2 of the License, or (at your option) any later version.

   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 koparaglayout_h
#define koparaglayout_h

#include <KoRuler.h> // for KoTabulatorList
#include <tqdom.h>
#include "KoBorder.h"
#include <koffice_export.h>
class KoSavingContext;
class KoGenStyle;
class KoParagCounter;
class KoParagStyle;
class KoOasisContext;
class TQColor;

/**
 * This class holds the paragraph-specific formatting information
 * It's separated from KoTextParag so that it can be copied in
 * the undo/redo history, and in KoParagStyle.
 */
class KOTEXT_EXPORT KoParagLayout
{
public:
    KoParagLayout();
    KoParagLayout( const KoParagLayout &tqlayout ) { operator=( tqlayout ); }

    ~KoParagLayout();

    /** This enum is used to mark parts of a KoParagLayout as changed
     * (i.e. when changing them in the dialog/stylist) */
    enum { Alignment = 1,
           BulletNumber = 2, // TODO: we can use Counter now :)
           Margins = 4,
           LineSpacing = 8,
           Borders = 16,
           Tabulator = 32,
           PageBreaking = 64,
           BackgroundColor = 128,
           /* Style is maybe missing */
           All = Alignment | BulletNumber | Margins | LineSpacing |
                 Borders | Tabulator | PageBreaking | BackgroundColor
    } Flags;

    /** Page breaking flags */
    enum {
        BreakBetweenLines = 0, // default
        KeepLinesTogether = 1,
        HardFrameBreakBefore = 2,      // incompatible with KeepWithPrevious
        HardFrameBreakAfter = 4,       // incompatible with KeepWithNext
        KeepWithPrevious = 8,          // incompatible with HardFrameBreakBefore
        KeepWithNext = 16              // incompatible with HardFrameBreakAfter
    };

    // This class is used as a struct, which explains the public vars :)
    /** left, right, top, bottom, firstLineSpacing - in pt */
    double margins[5];
    /**
     * Line spacing values
     * Assuming h is the height of the biggest char in the line,
     * and v is the linespacing value, the total line height is:
     *
     * Single: h
     * 1.5/2/multiple: v*h
     * Custom (aka "line distance"): h + v
     * At least: >= v
     * Fixed: v
     */
    enum SpacingType { LS_SINGLE = 0, LS_ONEANDHALF = -1, LS_DOUBLE = -2,
                       LS_CUSTOM = -3, LS_AT_LEAST = -4, LS_MULTIPLE = -5, LS_FIXED = -6 };
    SpacingType lineSpacingType;
    double lineSpacingValue() const { return lineSpacing;}
    void setLineSpacingValue(double _value) { lineSpacing = _value;}

    static TQString* shadowCssCompat; // used for compat with koffice-1.2 when loading

    bool joinBorder:1;
    bool unused:7;          // for future use
    char pageBreaking;    // Page breaking flags
    char direction;       // TQChar::Direction
    /// Alignment flag (AlignAuto/AlignLeft/AlignRight/AlignJustify)
    char tqalignment; // TQt::AlignmentFlags
    KoBorder leftBorder, rightBorder, topBorder, bottomBorder;

    /// The background color of the paragraph
    /**
     *  The background color is used for text that has no background color set,
     *  and for parts of the paragraph that are not covered by text.
     *  In theory anyway: the background colour isn't used in rendering text
     *  yet, but it's nice to preserve the value.
     */
    TQColor backgroundColor;

    /** can be 0 if no counter set */
    KoParagCounter* counter;

    KoParagStyle* style;

    bool hasBorder() const { return topBorder.penWidth() > 0
                                 || bottomBorder.penWidth() > 0
                                 || leftBorder.penWidth() > 0
                                 || rightBorder.penWidth() > 0; }

    void setTabList( const KoTabulatorList & tabList ) { m_tabList = tabList; }
    const KoTabulatorList& tabList() const { return m_tabList; }

    //! Assignment operator for KoParagLayout
    /** Copy a paragraph tqlayout.
     *
     *  If you're modifying this, you might also need to modify
     * KoTextParag::setParagLayout
     */
    void operator=( const KoParagLayout & );

    /** Return a set of flags showing the differences between this and 'tqlayout' */
    int compare( const KoParagLayout & tqlayout ) const;

    /** Save this parag tqlayout to XML.
     * This format is used by KWord for paragraphs, and by KPresenter+KWord for styles.
     */
    void saveParagLayout( TQDomElement & parentElem, int tqalignment ) const;

    /** Load this parag tqlayout from XML.
     * This format is used by KWord for paragraphs, and by KPresenter+KWord for styles.
     */
    static void loadParagLayout( KoParagLayout& tqlayout, const TQDomElement& parentElem, int docVersion = 2 );

    /// Load this parag tqlayout from Oasis XML
    static void loadOasisParagLayout( KoParagLayout& tqlayout, KoOasisContext& context );
    /// Save this parag tqlayout to Oasis XML
    /// @param savingStyle true if this is saved as part of a user style,
    ///                    false when saving a paragraph
    /// @param gs the style where all the properties will be saved to
    /// @param context the current context
    void saveOasis( KoGenStyle& gs, KoSavingContext& context, bool savingStyle ) const;

    /// Convert an tqalignment string into an tqalignment flag (load)
    static TQt::AlignmentFlags loadOasisAlignment( const TQCString& str );
    /// Convert an tqalignment flag into an tqalignment string (save)
    static TQCString saveOasisAlignment( TQt::AlignmentFlags tqalignment );

private:
    static int getAttribute(const TQDomElement &element, const char *attributeName, int defaultValue) {
        TQString value = element.attribute( attributeName );
        return value.isNull() ? defaultValue : value.toInt();
    }

    static double getAttribute(const TQDomElement &element, const char *attributeName, double defaultValue) {
        TQString value = element.attribute( attributeName );
        return value.isNull() ? defaultValue : value.toDouble();
    }

private:
    KoTabulatorList m_tabList;
    double lineSpacing;
    class Private;
    Private *d;

    /** Common setup. */
    void initialise();
};

#endif