textctrl.h

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    // -------

    // draw the text in the given rectangle
    void DoDrawTextInRect(wxDC& dc, const wxRect& rectUpdate);

    // draw the line wrap marks in this rect
    void DoDrawLineWrapMarks(wxDC& dc, const wxRect& rectUpdate);

    // line/row geometry calculations
    // ------------------------------

    // get the extent (width) of the text
    wxCoord GetTextWidth(const wxString& text) const;

    // get the logical text width (accounting for scrolling)
    wxCoord GetTotalWidth() const;

    // get total number of rows (different from number of lines if the lines
    // can be wrapped)
    wxTextCoord GetRowCount() const;

    // find the number of rows in this line (only if WrapLines())
    wxTextCoord GetRowsPerLine(wxTextCoord line) const;

    // get the starting row of the given line
    wxTextCoord GetFirstRowOfLine(wxTextCoord line) const;

    // get the row following this line
    wxTextCoord GetRowAfterLine(wxTextCoord line) const;

    // refresh functions
    // -----------------

    // the text area is the part of the window in which the text can be
    // displayed, i.e. part of it inside the margins and the real text area is
    // the area in which the text *is* currently displayed: for example, in the
    // multiline control case the text area can have extra space at the bottom
    // which is not tall enough for another line and which is then not included
    // into the real text area
    wxRect GetRealTextArea() const;

    // refresh the text in the given (in logical coords) rect
    void RefreshTextRect(const wxRect& rect, bool textOnly = true);

    // refresh the line wrap marks for the given range of lines (inclusive)
    void RefreshLineWrapMarks(wxTextCoord rowFirst, wxTextCoord rowLast);

    // refresh the text in the given range (in logical coords) of this line, if
    // width is 0, refresh to the end of line
    void RefreshPixelRange(wxTextCoord line, wxCoord start, wxCoord width);

    // refresh the text in the given range (in text coords) in this line
    void RefreshColRange(wxTextCoord line, wxTextPos start, size_t count);

    // refresh the text from in the given line range (inclusive)
    void RefreshLineRange(wxTextCoord lineFirst, wxTextCoord lineLast);

    // refresh the text in the given range which can span multiple lines
    // (this method accepts arguments in any order)
    void RefreshTextRange(wxTextPos start, wxTextPos end);

    // get the text to show: either the text itself or the text replaced with
    // starts for wxTE_PASSWORD control
    wxString GetTextToShow(const wxString& text) const;

    // find the row in this line where the given position (counted from the
    // start of line) is
    wxTextCoord GetRowInLine(wxTextCoord line,
                             wxTextCoord col,
                             wxTextCoord *colRowStart = NULL) const;

    // find the number of characters of a line before it wraps
    // (and optionally also the real width of the line)
    size_t GetPartOfWrappedLine(const wxChar* text,
                                wxCoord *widthReal = NULL) const;

    // get the start and end of the selection for this line: if the line is
    // outside the selection, both will be -1 and false will be returned
    bool GetSelectedPartOfLine(wxTextCoord line,
                               wxTextPos *start, wxTextPos *end) const;

    // update the text rect: the zone inside our client rect (its coords are
    // client coords) which contains the text
    void UpdateTextRect();

    // calculate the last visible position
    void UpdateLastVisible();

    // move caret to the given position unconditionally
    // (SetInsertionPoint() does nothing if the position didn't change)
    void DoSetInsertionPoint(wxTextPos pos);

    // move caret to the new position without updating the display (for
    // internal use only)
    void MoveInsertionPoint(wxTextPos pos);

    // set the caret to its initial (default) position
    void InitInsertionPoint();

    // get the width of the longest line in pixels
    wxCoord GetMaxWidth() const;

    // force recalculation of the max line width
    void RecalcMaxWidth();

    // update the max width after the given line was modified
    void UpdateMaxWidth(wxTextCoord line);

    // hit testing
    // -----------

    // HitTest2() is more efficient than 2 consecutive HitTest()s with the same
    // line (i.e. y) and it also returns the offset of the starting position in
    // pixels
    //
    // as the last hack, this function accepts either logical or device (by
    // default) coords depending on devCoords flag
    wxTextCtrlHitTestResult HitTest2(wxCoord y,
                                     wxCoord x1,
                                     wxCoord x2,
                                     wxTextCoord *row,
                                     wxTextCoord *colStart,
                                     wxTextCoord *colEnd,
                                     wxTextCoord *colRowStart,
                                     bool devCoords = true) const;

    // HitTest() version which takes the logical text coordinates and not the
    // device ones
    wxTextCtrlHitTestResult HitTestLogical(const wxPoint& pos,
                                           wxTextCoord *col,
                                           wxTextCoord *row) const;

    // get the line and the row in this line corresponding to the given row,
    // return true if ok and false if row is out of range
    //
    // NB: this function can only be called for controls which wrap lines
    bool GetLineAndRow(wxTextCoord row,
                       wxTextCoord *line,
                       wxTextCoord *rowInLine) const;

    // get the height of one line (the same for all lines)
    wxCoord GetLineHeight() const
    {
        // this one should be already precalculated
        wxASSERT_MSG( m_heightLine != -1, _T("should have line height") );

        return m_heightLine;
    }

    // get the average char width
    wxCoord GetAverageWidth() const { return m_widthAvg; }

    // recalc the line height and char width (to call when the font changes)
    void RecalcFontMetrics();

    // vertical scrolling helpers
    // --------------------------

    // all these functions are for multi line controls only

    // get the number of visible lines
    size_t GetLinesPerPage() const;

    // return the position above the cursor or INVALID_POS_VALUE
    wxTextPos GetPositionAbove();

    // return the position below the cursor or INVALID_POS_VALUE
    wxTextPos GetPositionBelow();

    // event handlers
    // --------------
    void OnChar(wxKeyEvent& event);
    void OnSize(wxSizeEvent& event);

    // return the struct containing control-type dependent data
    struct wxTextSingleLineData& SData() { return *m_data.sdata; }
    struct wxTextMultiLineData& MData() { return *m_data.mdata; }
    struct wxTextWrappedData& WData() { return *m_data.wdata; }
    const wxTextSingleLineData& SData() const { return *m_data.sdata; }
    const wxTextMultiLineData& MData() const { return *m_data.mdata; }
    const wxTextWrappedData& WData() const { return *m_data.wdata; }

    // clipboard operations (unlike the versions without Do prefix, they have a
    // return code)
    bool DoCut();
    bool DoPaste();

private:
    // all these methods are for multiline text controls only

    // update the scrollbars (only called from OnIdle)
    void UpdateScrollbars();

    // get read only access to the lines of multiline control
    inline const wxArrayString& GetLines() const;
    inline size_t GetLineCount() const;

    // replace a line (returns true if the number of rows in thel ine changed)
    bool ReplaceLine(wxTextCoord line, const wxString& text);

    // remove a line
    void RemoveLine(wxTextCoord line);

    // insert a line at this position
    void InsertLine(wxTextCoord line, const wxString& text);

    // calculate geometry of this line
    void LayoutLine(wxTextCoord line, class wxWrappedLineData& lineData) const;

    // calculate geometry of all lines until the given one
    void LayoutLines(wxTextCoord lineLast) const;

    // the initially specified control size
    wxSize m_sizeInitial;

    // the global control text
    wxString m_value;

    // current position
    wxTextPos m_curPos;
    wxTextCoord m_curCol,
                m_curRow;

    // last position (only used by GetLastPosition())
    wxTextPos m_posLast;

    // selection
    wxTextPos m_selAnchor,
              m_selStart,
              m_selEnd;

    // flags
    bool m_isModified:1,
         m_isEditable:1,
         m_hasCaret:1;

    // the rectangle (in client coordinates) to draw text inside
    wxRect m_rectText;

    // the height of one line (cached value of GetCharHeight)
    wxCoord m_heightLine;

    // and the average char width (cached value of GetCharWidth)
    wxCoord m_widthAvg;

    // we have some data which depends on the kind of control (single or multi
    // line)
    union
    {
        wxTextSingleLineData *sdata;
        wxTextMultiLineData *mdata;
        wxTextWrappedData *wdata;
        void *data;
    } m_data;

    // the object to which we delegate our undo/redo implementation
    wxTextCtrlCommandProcessor *m_cmdProcessor;

    DECLARE_EVENT_TABLE()
    DECLARE_DYNAMIC_CLASS(wxTextCtrl)

    friend class wxWrappedLineData;
};

#endif // _WX_UNIV_TEXTCTRL_H_