wxWidgets/interface/html/winpars.h

/////////////////////////////////////////////////////////////////////////////
// Name:        html/winpars.h
// Purpose:     interface of wxHtmlTagsModule
// Author:      wxWidgets team
// RCS-ID:      $Id$
// Licence:     wxWindows license
/////////////////////////////////////////////////////////////////////////////

/**
    @class wxHtmlTagsModule
    @headerfile winpars.h wx/html/winpars.h

    This class provides easy way of filling wxHtmlWinParser's table of
    tag handlers. It is used almost exclusively together with the set of
    @ref overview_handlers "TAGS_MODULE_* macros"

    @library{wxhtml}
    @category{FIXME}

    @see @ref overview_handlers "Tag Handlers", wxHtmlTagHandler,
    wxHtmlWinTagHandler,
*/
class wxHtmlTagsModule : public wxModule
{
public:
    /**
        You must override this method. In most common case its body consists
        only of lines of the following type:
        
        I recommend using the @b TAGS_MODULE_* macros.
        
        @param parser
            Pointer to the parser that requested tables filling.
    */
    virtual void FillHandlersTable(wxHtmlWinParser parser);
};



/**
    @class wxHtmlWinTagHandler
    @headerfile winpars.h wx/html/winpars.h

    This is basically wxHtmlTagHandler except that
    it is extended with protected member m_WParser pointing to
    the wxHtmlWinParser object (value of this member is identical
    to wxHtmlParser's m_Parser).

    @library{wxhtml}
    @category{html}
*/
class wxHtmlWinTagHandler : public wxHtmlTagHandler
{
public:
    /**
        @b wxHtmlWinParser* m_WParser
        Value of this attribute is identical to value of m_Parser. The only different
        is that m_WParser points to wxHtmlWinParser object while m_Parser
        points to wxHtmlParser object. (The same object, but overcast.)
    */
};



/**
    @class wxHtmlWinParser
    @headerfile winpars.h wx/html/winpars.h

    This class is derived from wxHtmlParser and
    its main goal is to parse HTML input so that it can be displayed in
    wxHtmlWindow. It uses a special
    wxHtmlWinTagHandler.

    @library{wxhtml}
    @category{html}

    @see @ref overview_handlers "Handlers overview"
*/
class wxHtmlWinParser : public wxHtmlParser
{
public:
    //@{
    /**
        Constructor. Don't use the default one, use constructor with
        @a wndIface parameter (@a wndIface is a pointer to interface object for
        the associated wxHtmlWindow or other HTML rendering
        window such as wxHtmlListBox).
    */
    wxHtmlWinParser();
    wxHtmlWinParser(wxHtmlWindowInterface wndIface);
    //@}

    /**
        Adds module() to the list of wxHtmlWinParser tag handler.
    */
    static void AddModule(wxHtmlTagsModule module);

    /**
        Closes the container, sets actual container to the parent one
        and returns pointer to it (see Overview()).
    */
    wxHtmlContainerCell* CloseContainer();

    /**
        Creates font based on current setting (see
        SetFontSize(),
        SetFontBold(),
        SetFontItalic(),
        SetFontFixed(),
        wxHtmlWinParser::SetFontUnderlined)
        and returns pointer to it.
        If the font was already created only a pointer is returned.
    */
    virtual wxFont* CreateCurrentFont();

    /**
        Returns actual text colour.
    */
    const wxColour GetActualColor() const;

    /**
        Returns default horizontal alignment.
    */
    int GetAlign() const;

    /**
        Returns (average) char height in standard font. It is used as DC-independent
        metrics.
        @b Note: This function doesn't return the @e actual height. If you want to
        know the height of the current font, call @c GetDC - GetCharHeight().
    */
    int GetCharHeight() const;

    /**
        Returns average char width in standard font. It is used as DC-independent
        metrics.
        @b Note: This function doesn't return the @e actual width. If you want to
        know the height of the current font, call @c GetDC - GetCharWidth()
    */
    int GetCharWidth() const;

    /**
        Returns pointer to the currently opened container (see Overview()).
        Common use:
    */
    wxHtmlContainerCell* GetContainer() const;

    /**
        Returns pointer to the DC used during parsing.
    */
    wxDC* GetDC();

    /**
        Returns wxEncodingConverter class used
        to do conversion between @ref getinputencoding() "input encoding"
        and @ref getoutputencoding() "output encoding".
    */
    wxEncodingConverter* GetEncodingConverter() const;

    /**
        Returns @true if actual font is bold, @false otherwise.
    */
    int GetFontBold() const;

    /**
        Returns actual font face name.
    */
    wxString GetFontFace() const;

    /**
        Returns @true if actual font is fixed face, @false otherwise.
    */
    int GetFontFixed() const;

    /**
        Returns @true if actual font is italic, @false otherwise.
    */
    int GetFontItalic() const;

    /**
        Returns actual font size (HTML size varies from -2 to +4)
    */
    int GetFontSize() const;

    /**
        Returns @true if actual font is underlined, @false otherwise.
    */
    int GetFontUnderlined() const;

    /**
        Returns input encoding.
    */
    wxFontEncoding GetInputEncoding() const;

    /**
        Returns actual hypertext link. (This value has a non-empty
        @ref wxHtmlLinkInfo::gethref Href string
        if the parser is between @c A and @c /A tags,
        wxEmptyString otherwise.)
    */
    const wxHtmlLinkInfo GetLink() const;

    /**
        Returns the colour of hypertext link text.
    */
    const wxColour GetLinkColor() const;

    /**
        Returns output encoding, i.e. closest match to document's input encoding
        that is supported by operating system.
    */
    wxFontEncoding GetOutputEncoding() const;

    /**
        Returns associated window (wxHtmlWindow). This may be @NULL! (You should always
        test if it is non-@NULL. For example @c TITLE handler sets window
        title only if some window is associated, otherwise it does nothing)
    */
    wxHtmlWindow* GetWindow();

    /**
        Opens new container and returns pointer to it (see Overview()).
    */
    wxHtmlContainerCell* OpenContainer();

    /**
        Sets actual text colour. Note: this DOESN'T change the colour!
        You must create wxHtmlColourCell yourself.
    */
    void SetActualColor(const wxColour& clr);

    /**
        Sets default horizontal alignment (see
        wxHtmlContainerCell::SetAlignHor.)
        Alignment of newly opened container is set to this value.
    */
    void SetAlign(int a);

    /**
        Allows you to directly set opened container. This is not recommended - you
        should use OpenContainer
        wherever possible.
    */
    wxHtmlContainerCell* SetContainer(wxHtmlContainerCell* c);

    /**
        Sets the DC. This must be called before wxHtmlParser::Parse!
        @a pixel_scale  can be used when rendering to high-resolution
        DCs (e.g. printer) to adjust size of pixel metrics. (Many dimensions in
        HTML are given in pixels -- e.g. image sizes. 300x300 image would be only one
        inch wide on typical printer. With pixel_scale = 3.0 it would be 3 inches.)
    */
    virtual void SetDC(wxDC dc, double pixel_scale = 1.0);

    /**
        Sets bold flag of actualfont. @a x is either @true of @false.
    */
    void SetFontBold(int x);

    /**
        Sets current font face to @e face. This affects either fixed size
        font or proportional, depending on context (whether the parser is
        inside @c TT tag or not).
    */
    void SetFontFace(const wxString& face);

    /**
        Sets fixed face flag of actualfont. @a x is either @true of @false.
    */
    void SetFontFixed(int x);

    /**
        Sets italic flag of actualfont. @a x is either @true of @false.
    */
    void SetFontItalic(int x);

    /**
        Sets actual font size (HTML size varies from 1 to 7)
    */
    void SetFontSize(int s);

    /**
        Sets underlined flag of actualfont. @a x is either @true of @false.
    */
    void SetFontUnderlined(int x);

    /**
        Sets fonts. See wxHtmlWindow::SetFonts for
        detailed description.
    */
    void SetFonts(const wxString& normal_face,
                  const wxString& fixed_face,
                  const int sizes = NULL);

    /**
        Sets input encoding. The parser uses this information to build conversion
        tables from document's encoding to some encoding supported by operating
        system.
    */
    void SetInputEncoding(wxFontEncoding enc);

    /**
        Sets actual hypertext link. Empty link is represented
        by wxHtmlLinkInfo with @e Href equal
        to wxEmptyString.
    */
    void SetLink(const wxHtmlLinkInfo& link);

    /**
        Sets colour of hypertext link.
    */
    void SetLinkColor(const wxColour& clr);
};