htmlcell.h

wxGTK 是 wxWidgets 的 linux GTK+ (>2.2.3)版本。wxWidgets 是一个跨平台的 GUI 框架

    // dimensions of fragment (m_Descent is used to position text & images)
    long m_Width, m_Height, m_Descent;
    // position where the fragment is drawn:
    long m_PosX, m_PosY;

    // superscript/subscript/normal:
    wxHtmlScriptMode m_ScriptMode;
    long m_ScriptBaseline;

    // destination address if this fragment is hypertext link, NULL otherwise
    wxHtmlLinkInfo *m_Link;
    // true if this cell can be placed on pagebreak, false otherwise
    bool m_CanLiveOnPagebreak;
    // unique identifier of the cell, generated from "id" property of tags
    wxString m_id;

    DECLARE_ABSTRACT_CLASS(wxHtmlCell)
    DECLARE_NO_COPY_CLASS(wxHtmlCell)
};




// ----------------------------------------------------------------------------
// Inherited cells:
// ----------------------------------------------------------------------------


// ----------------------------------------------------------------------------
// wxHtmlWordCell
//                  Single word in input stream.
// ----------------------------------------------------------------------------

class WXDLLIMPEXP_HTML wxHtmlWordCell : public wxHtmlCell
{
public:
    wxHtmlWordCell(const wxString& word, const wxDC& dc);
    void Draw(wxDC& dc, int x, int y, int view_y1, int view_y2,
              wxHtmlRenderingInfo& info);
    virtual wxCursor GetMouseCursor(wxHtmlWindowInterface *window) const;
    wxString ConvertToText(wxHtmlSelection *sel) const;
    bool IsLinebreakAllowed() const { return m_allowLinebreak; }

    void SetPreviousWord(wxHtmlWordCell *cell);

protected:
    void SetSelectionPrivPos(const wxDC& dc, wxHtmlSelection *s) const;
    void Split(const wxDC& dc,
               const wxPoint& selFrom, const wxPoint& selTo,
               unsigned& pos1, unsigned& pos2) const;

    wxString m_Word;
    bool     m_allowLinebreak;

    DECLARE_ABSTRACT_CLASS(wxHtmlWordCell)
    DECLARE_NO_COPY_CLASS(wxHtmlWordCell)
};





// Container contains other cells, thus forming tree structure of rendering
// elements. Basic code of layout algorithm is contained in this class.
class WXDLLIMPEXP_HTML wxHtmlContainerCell : public wxHtmlCell
{
public:
    wxHtmlContainerCell(wxHtmlContainerCell *parent);
    virtual ~wxHtmlContainerCell();

    virtual void Layout(int w);
    virtual void Draw(wxDC& dc, int x, int y, int view_y1, int view_y2,
                      wxHtmlRenderingInfo& info);
    virtual void DrawInvisible(wxDC& dc, int x, int y,
                               wxHtmlRenderingInfo& info);
/*    virtual bool AdjustPagebreak(int *pagebreak, int *known_pagebreaks = NULL, int number_of_pages = 0) const;*/
    virtual bool AdjustPagebreak(int *pagebreak, wxArrayInt& known_pagebreaks) const;

    // insert cell at the end of m_Cells list
    void InsertCell(wxHtmlCell *cell);

    // sets horizontal/vertical alignment
    void SetAlignHor(int al) {m_AlignHor = al; m_LastLayout = -1;}
    int GetAlignHor() const {return m_AlignHor;}
    void SetAlignVer(int al) {m_AlignVer = al; m_LastLayout = -1;}
    int GetAlignVer() const {return m_AlignVer;}

    // sets left-border indentation. units is one of wxHTML_UNITS_* constants
    // what is combination of wxHTML_INDENT_*
    void SetIndent(int i, int what, int units = wxHTML_UNITS_PIXELS);
    // returns the indentation. ind is one of wxHTML_INDENT_* constants
    int GetIndent(int ind) const;
    // returns type of value returned by GetIndent(ind)
    int GetIndentUnits(int ind) const;

    // sets alignment info based on given tag's params
    void SetAlign(const wxHtmlTag& tag);
    // sets floating width adjustment
    // (examples : 32 percent of parent container,
    // -15 pixels percent (this means 100 % - 15 pixels)
    void SetWidthFloat(int w, int units) {m_WidthFloat = w; m_WidthFloatUnits = units; m_LastLayout = -1;}
    void SetWidthFloat(const wxHtmlTag& tag, double pixel_scale = 1.0);
    // sets minimal height of this container.
    void SetMinHeight(int h, int align = wxHTML_ALIGN_TOP) {m_MinHeight = h; m_MinHeightAlign = align; m_LastLayout = -1;}

    void SetBackgroundColour(const wxColour& clr) {m_UseBkColour = true; m_BkColour = clr;}
    // returns background colour (of wxNullColour if none set), so that widgets can
    // adapt to it:
    wxColour GetBackgroundColour();
    void SetBorder(const wxColour& clr1, const wxColour& clr2) {m_UseBorder = true; m_BorderColour1 = clr1, m_BorderColour2 = clr2;}
    virtual wxHtmlLinkInfo* GetLink(int x = 0, int y = 0) const;
    virtual const wxHtmlCell* Find(int condition, const void* param) const;

#if WXWIN_COMPATIBILITY_2_6
    // this was replaced by ProcessMouseClick, don't use in new code!
    virtual void OnMouseClick(wxWindow *window,
                              int x, int y, const wxMouseEvent& event);
#endif
    virtual bool ProcessMouseClick(wxHtmlWindowInterface *window,
                                   const wxPoint& pos,
                                   const wxMouseEvent& event);

    virtual wxHtmlCell* GetFirstChild() const { return m_Cells; }
#if WXWIN_COMPATIBILITY_2_4
    wxDEPRECATED( wxHtmlCell* GetFirstCell() const );
#endif
    // returns last child cell:
    wxHtmlCell* GetLastChild() const { return m_LastCell; }

    // see comment in wxHtmlCell about this method
    virtual bool IsTerminalCell() const { return false; }

    virtual wxHtmlCell *FindCellByPos(wxCoord x, wxCoord y,
                                  unsigned flags = wxHTML_FIND_EXACT) const;

    virtual wxHtmlCell *GetFirstTerminal() const;
    virtual wxHtmlCell *GetLastTerminal() const;


    // Removes indentation on top or bottom of the container (i.e. above or
    // below first/last terminal cell). For internal use only.
    virtual void RemoveExtraSpacing(bool top, bool bottom);

    // Returns the maximum possible length of the container.
    // Call Layout at least once before using GetMaxTotalWidth()
    virtual int GetMaxTotalWidth() const { return m_MaxTotalWidth; }

protected:
    void UpdateRenderingStatePre(wxHtmlRenderingInfo& info,
                                 wxHtmlCell *cell) const;
    void UpdateRenderingStatePost(wxHtmlRenderingInfo& info,
                                  wxHtmlCell *cell) const;

protected:
    int m_IndentLeft, m_IndentRight, m_IndentTop, m_IndentBottom;
            // indentation of subcells. There is always m_Indent pixels
            // big space between given border of the container and the subcells
            // it m_Indent < 0 it is in PERCENTS, otherwise it is in pixels
    int m_MinHeight, m_MinHeightAlign;
        // minimal height.
    wxHtmlCell *m_Cells, *m_LastCell;
            // internal cells, m_Cells points to the first of them, m_LastCell to the last one.
            // (LastCell is needed only to speed-up InsertCell)
    int m_AlignHor, m_AlignVer;
            // alignment horizontal and vertical (left, center, right)
    int m_WidthFloat, m_WidthFloatUnits;
            // width float is used in adjustWidth
    bool m_UseBkColour;
    wxColour m_BkColour;
            // background color of this container
    bool m_UseBorder;
    wxColour m_BorderColour1, m_BorderColour2;
            // borders color of this container
    int m_LastLayout;
            // if != -1 then call to Layout may be no-op
            // if previous call to Layout has same argument
    int m_MaxTotalWidth;
            // Maximum possible length if ignoring line wrap


    DECLARE_ABSTRACT_CLASS(wxHtmlContainerCell)
    DECLARE_NO_COPY_CLASS(wxHtmlContainerCell)
};

#if WXWIN_COMPATIBILITY_2_4
inline wxHtmlCell* wxHtmlContainerCell::GetFirstCell() const
    { return GetFirstChild(); }
#endif




// ---------------------------------------------------------------------------
// wxHtmlColourCell
//                  Color changer.
// ---------------------------------------------------------------------------

class WXDLLIMPEXP_HTML wxHtmlColourCell : public wxHtmlCell
{
public:
    wxHtmlColourCell(const wxColour& clr, int flags = wxHTML_CLR_FOREGROUND) : wxHtmlCell() {m_Colour = clr; m_Flags = flags;}
    virtual void Draw(wxDC& dc, int x, int y, int view_y1, int view_y2,
                      wxHtmlRenderingInfo& info);
    virtual void DrawInvisible(wxDC& dc, int x, int y,
                               wxHtmlRenderingInfo& info);

protected:
    wxColour m_Colour;
    unsigned m_Flags;

    DECLARE_ABSTRACT_CLASS(wxHtmlColourCell)
    DECLARE_NO_COPY_CLASS(wxHtmlColourCell)
};




//--------------------------------------------------------------------------------
// wxHtmlFontCell
//                  Sets actual font used for text rendering
//--------------------------------------------------------------------------------

class WXDLLIMPEXP_HTML wxHtmlFontCell : public wxHtmlCell
{
public:
    wxHtmlFontCell(wxFont *font) : wxHtmlCell() { m_Font = (*font); }
    virtual void Draw(wxDC& dc, int x, int y, int view_y1, int view_y2,
                      wxHtmlRenderingInfo& info);
    virtual void DrawInvisible(wxDC& dc, int x, int y,
                               wxHtmlRenderingInfo& info);

protected:
    wxFont m_Font;

    DECLARE_ABSTRACT_CLASS(wxHtmlFontCell)
    DECLARE_NO_COPY_CLASS(wxHtmlFontCell)
};






//--------------------------------------------------------------------------------
// wxHtmlwidgetCell
//                  This cell is connected with wxWindow object
//                  You can use it to insert windows into HTML page
//                  (buttons, input boxes etc.)
//--------------------------------------------------------------------------------

class WXDLLIMPEXP_HTML wxHtmlWidgetCell : public wxHtmlCell
{
public:
    // !!! wnd must have correct parent!
    // if w != 0 then the m_Wnd has 'floating' width - it adjust
    // it's width according to parent container's width
    // (w is percent of parent's width)
    wxHtmlWidgetCell(wxWindow *wnd, int w = 0);
    virtual ~wxHtmlWidgetCell() { m_Wnd->Destroy(); }
    virtual void Draw(wxDC& dc, int x, int y, int view_y1, int view_y2,
                      wxHtmlRenderingInfo& info);
    virtual void DrawInvisible(wxDC& dc, int x, int y,
                               wxHtmlRenderingInfo& info);
    virtual void Layout(int w);

protected:
    wxWindow* m_Wnd;
    int m_WidthFloat;
            // width float is used in adjustWidth (it is in percents)

    DECLARE_ABSTRACT_CLASS(wxHtmlWidgetCell)
    DECLARE_NO_COPY_CLASS(wxHtmlWidgetCell)
};



//--------------------------------------------------------------------------------
// wxHtmlLinkInfo
//                  Internal data structure. It represents hypertext link
//--------------------------------------------------------------------------------

class WXDLLIMPEXP_HTML wxHtmlLinkInfo : public wxObject
{
public:
    wxHtmlLinkInfo() : wxObject()
          { m_Href = m_Target = wxEmptyString; m_Event = NULL, m_Cell = NULL; }
    wxHtmlLinkInfo(const wxString& href, const wxString& target = wxEmptyString) : wxObject()
          { m_Href = href; m_Target = target; m_Event = NULL, m_Cell = NULL; }
    wxHtmlLinkInfo(const wxHtmlLinkInfo& l) : wxObject()
          { m_Href = l.m_Href, m_Target = l.m_Target, m_Event = l.m_Event;
            m_Cell = l.m_Cell; }
    wxHtmlLinkInfo& operator=(const wxHtmlLinkInfo& l)
          { m_Href = l.m_Href, m_Target = l.m_Target, m_Event = l.m_Event;
            m_Cell = l.m_Cell; return *this; }

    void SetEvent(const wxMouseEvent *e) { m_Event = e; }
    void SetHtmlCell(const wxHtmlCell *e) { m_Cell = e; }

    wxString GetHref() const { return m_Href; }
    wxString GetTarget() const { return m_Target; }
    const wxMouseEvent* GetEvent() const { return m_Event; }
    const wxHtmlCell* GetHtmlCell() const { return m_Cell; }

private:
    wxString m_Href, m_Target;
    const wxMouseEvent *m_Event;
    const wxHtmlCell *m_Cell;
};



// ----------------------------------------------------------------------------
// wxHtmlTerminalCellsInterator
// ----------------------------------------------------------------------------

class WXDLLIMPEXP_HTML wxHtmlTerminalCellsInterator
{
public:
    wxHtmlTerminalCellsInterator(const wxHtmlCell *from, const wxHtmlCell *to)
        : m_to(to), m_pos(from) {}

    operator bool() const { return m_pos != NULL; }
    const wxHtmlCell* operator++();
    const wxHtmlCell* operator->() const { return m_pos; }
    const wxHtmlCell* operator*() const { return m_pos; }

private:
    const wxHtmlCell *m_to, *m_pos;
};



#endif // wxUSE_HTML

#endif // _WX_HTMLCELL_H_