/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * This file is part of the LibreOffice project.
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 * 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
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 *   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_FRAMELINK_HXX
#define INCLUDED_SVX_FRAMELINK_HXX

#include <sal/types.h>
#include <tools/color.hxx>
#include <svx/svxdllapi.h>
#include <editeng/borderline.hxx>

#include <memory>

namespace svx {
namespace frame {


// Enums


/** Specifies how the reference points for frame borders are used.
 */
enum class RefMode
{
    /** Frame borders are drawn centered to the reference points. */
    Centered,

    /** The reference points specify the begin of the frame border width.

        The result is that horizontal lines are drawn below, and vertical lines
        are drawn right of the reference points.
     */
    Begin,

    /** The reference points specify the end of the frame border width.

        The result is that horizontal lines are drawn above, and vertical lines
        are drawn left of the reference points.
     */
    End
};


// Classes


/** Contains the widths of primary and secondary line of a frame style.

    In the following, "frame style" is a complete style of one frame border,
    i.e. the double line at the left side of the frame. A "line" is always a
    trivial single line, i.e. the first line of a double frame style.

    The following states of the members of this struct are valid:

    mnPrim      mnDist      mnSecn      frame style
    -------------------------------------------------
    0           0           0           invisible
    >0          0           0           single
    >0          >0          >0          double

    The behaviour of the member functions for other states is not defined.

    Per definition the primary line in double frame styles is:
    -   The top line for horizontal frame borders.
    -   The left line for vertical frame borders.
    -   The bottom-left line for top-left to bottom-right diagonal frame borders.
    -   The top-left line for bottom-left to top-right diagonal frame borders.

    The following picture shows the upper end of a vertical double frame
    border.

        |<---------------- GetWidth() ----------------->|
        |                                               |
        |<----- mnPrim ----->||<- mnDist ->||<- mnSecn >|
        |                    ||            ||           |
        ######################              #############
        ######################              #############
        ######################              #############
        ######################              #############
        ######################  |           #############
        ######################  |           #############
                                |
                                |<- middle of the frame border
 */
class SAL_WARN_UNUSED SVXCORE_DLLPUBLIC Style
{
private:
    class implStyle
    {
    private:
        friend class Style;

        Color               maColorPrim;
        Color               maColorSecn;
        Color               maColorGap;
        bool                mbUseGapColor;
        RefMode             meRefMode;  /// Reference point handling for this frame border.
        double              mfPrim;     /// Width of primary (single, left, or top) line.
        double              mfDist;     /// Distance between primary and secondary line.
        double              mfSecn;     /// Width of secondary (right or bottom) line.
        double              mfPatternScale; /// Scale used for line pattern spacing.
        SvxBorderLineStyle  mnType;
        bool mbWordTableCell;

    public:
        /** Constructs an invisible frame style. */
        explicit implStyle() :
            maColorPrim(),
            maColorSecn(),
            maColorGap(),
            mbUseGapColor(false),
            meRefMode(RefMode::Centered),
            mfPrim(0.0),
            mfDist(0.0),
            mfSecn(0.0),
            mfPatternScale(1.0),
            mnType(SvxBorderLineStyle::SOLID),
            mbWordTableCell(false)
        {}
    };

    /// the impl class holding the data
    std::shared_ptr< implStyle >        maImplStyle;

    /// call to set maImplStyle on demand
    void implEnsureImplStyle();

public:
    /** Constructs an invisible frame style. */
    explicit Style();
    /** Constructs a frame style with passed line widths. */
    explicit Style( double nP, double nD, double nS, SvxBorderLineStyle nType, double fScale );
    /** Constructs a frame style with passed color and line widths. */
    explicit Style( const Color& rColorPrim, const Color& rColorSecn, const Color& rColorGap, bool bUseGapColor, double nP, double nD, double nS, SvxBorderLineStyle nType, double fScale );
    /** Constructs a frame style from the passed SvxBorderLine struct. */
    explicit Style( const editeng::SvxBorderLine* pBorder, double fScale );

    RefMode GetRefMode() const { if(!maImplStyle) return RefMode::Centered; return maImplStyle->meRefMode; }
    Color GetColorPrim() const { if(!maImplStyle) return Color(); return maImplStyle->maColorPrim; }
    Color GetColorSecn() const { if(!maImplStyle) return Color(); return maImplStyle->maColorSecn; }
    Color GetColorGap() const { if(!maImplStyle) return Color(); return maImplStyle->maColorGap; }
    bool UseGapColor() const { if(!maImplStyle) return false; return maImplStyle->mbUseGapColor; }
    double Prim() const { if(!maImplStyle) return 0.0; return maImplStyle->mfPrim; }
    double Dist() const { if(!maImplStyle) return 0.0; return maImplStyle->mfDist; }
    double Secn() const { if(!maImplStyle) return 0.0; return maImplStyle->mfSecn; }
    double PatternScale() const { if(!maImplStyle) return 1.0; return maImplStyle->mfPatternScale;}
    SvxBorderLineStyle Type() const { if(!maImplStyle) return SvxBorderLineStyle::SOLID; return maImplStyle->mnType; }

    /// Check if this style is used - this depends on it having any width definition.
    /// As can be seen in the definition comment above, Prim() *must* be non zero to have a width
    bool IsUsed() const { if(!maImplStyle) return false; return 0.0 != maImplStyle->mfPrim; }

    /** Returns the total width of this frame style. */
    double GetWidth() const { if(!maImplStyle) return 0.0; implStyle* pTarget = maImplStyle.get(); return pTarget->mfPrim + pTarget->mfDist + pTarget->mfSecn; }

    /** Sets the frame style to invisible state. */
    void Clear();
    /** Sets the frame style to the passed line widths. */
    void Set( double nP, double nD, double nS );
    /** Sets the frame style to the passed line widths. */
    void Set( const Color& rColorPrim, const Color& rColorSecn, const Color& rColorGap, bool bUseGapColor, double nP, double nD, double nS );
    /** Sets the frame style to the passed SvxBorderLine struct. If nullptr, resets the style */
    void Set( const editeng::SvxBorderLine* pBorder, double fScale, sal_uInt16 nMaxWidth = SAL_MAX_UINT16 );

    /** Sets a new reference point handling mode, does not modify other settings. */
    void SetRefMode( RefMode eRefMode );
    /** Sets a new color, does not modify other settings. */
    void SetColorPrim( const Color& rColor );
    void SetColorSecn( const Color& rColor );
    /** Sets whether to use dotted style for single hair lines. */
    void SetType( SvxBorderLineStyle nType );

    /** Mirrors this style (exchanges primary and secondary), if it is a double frame style. */
    Style& MirrorSelf();

    /** Enables the Word-compatible Style comparison code. */
    void SetWordTableCell(bool bWordTableCell);

    bool operator==( const Style& rOther) const;
    bool operator<( const Style& rOther) const;
};

inline bool operator>( const Style& rL, const Style& rR ) { return rR.operator<(rL); }

}
}

#endif
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