richtextbuffer.h

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    /// Maximum descent for this line (location of text baseline)
    int                 m_descent;

    // The parent object
    wxRichTextParagraph* m_parent;
};

WX_DECLARE_LIST_WITH_DECL( wxRichTextLine, wxRichTextLineList , class WXDLLIMPEXP_RICHTEXT );

/*!
 * wxRichTextParagraph class declaration
 * This object represents a single paragraph (or in a straight text editor, a line).
 */

class WXDLLIMPEXP_RICHTEXT wxRichTextParagraph: public wxRichTextBox
{
    DECLARE_DYNAMIC_CLASS(wxRichTextParagraph)
public:
// Constructors

    wxRichTextParagraph(wxRichTextObject* parent = NULL, wxTextAttrEx* style = NULL);
    wxRichTextParagraph(const wxString& text, wxRichTextObject* parent = NULL, wxTextAttrEx* paraStyle = NULL, wxTextAttrEx* charStyle = NULL);
    virtual ~wxRichTextParagraph();
    wxRichTextParagraph(const wxRichTextParagraph& obj): wxRichTextBox() { Copy(obj); }

// Overrideables

    /// Draw the item
    virtual bool Draw(wxDC& dc, const wxRichTextRange& range, const wxRichTextRange& selectionRange, const wxRect& rect, int descent, int style);

    /// Lay the item out
    virtual bool Layout(wxDC& dc, const wxRect& rect, int style);

    /// Get/set the object size for the given range. Returns false if the range
    /// is invalid for this object.
    virtual bool GetRangeSize(const wxRichTextRange& range, wxSize& size, int& descent, wxDC& dc, int flags, wxPoint position = wxPoint(0,0)) const;

    /// Finds the absolute position and row height for the given character position
    virtual bool FindPosition(wxDC& dc, long index, wxPoint& pt, int* height, bool forceLineStart);

    /// Hit-testing: returns a flag indicating hit test details, plus
    /// information about position
    virtual int HitTest(wxDC& dc, const wxPoint& pt, long& textPosition);

    /// Calculate range
    virtual void CalculateRange(long start, long& end);

// Accessors

    /// Get the cached lines
    wxRichTextLineList& GetLines() { return m_cachedLines; }

// Operations

    /// Copy
    void Copy(const wxRichTextParagraph& obj);

    /// Clone
    virtual wxRichTextObject* Clone() const { return new wxRichTextParagraph(*this); }

    /// Clear the cached lines
    void ClearLines();

// Implementation

    /// Apply paragraph styles such as centering to the wrapped lines
    virtual void ApplyParagraphStyle(const wxTextAttrEx& attr, const wxRect& rect);

    /// Insert text at the given position
    virtual bool InsertText(long pos, const wxString& text);

    /// Split an object at this position if necessary, and return
    /// the previous object, or NULL if inserting at beginning.
    virtual wxRichTextObject* SplitAt(long pos, wxRichTextObject** previousObject = NULL);

    /// Move content to a list from this point
    virtual void MoveToList(wxRichTextObject* obj, wxList& list);

    /// Add content back from list
    virtual void MoveFromList(wxList& list);

    /// Get the plain text searching from the start or end of the range.
    /// The resulting string may be shorter than the range given.
    bool GetContiguousPlainText(wxString& text, const wxRichTextRange& range, bool fromStart = true);

    /// Find a suitable wrap position. wrapPosition is the last position in the line to the left
    /// of the split.
    bool FindWrapPosition(const wxRichTextRange& range, wxDC& dc, int availableSpace, long& wrapPosition);

    /// Find the object at the given position
    wxRichTextObject* FindObjectAtPosition(long position);

    /// Get the bullet text for this paragraph.
    wxString GetBulletText();

    /// Allocate or reuse a line object
    wxRichTextLine* AllocateLine(int pos);

    /// Clear remaining unused line objects, if any
    bool ClearUnusedLines(int lineCount);

    /// Get combined attributes of the base style, paragraph style and character style. We use this to dynamically
    /// retrieve the actual style.
    wxTextAttrEx GetCombinedAttributes(const wxTextAttrEx& contentStyle) const;

    /// Get combined attributes of the base style and paragraph style.
    wxTextAttrEx GetCombinedAttributes() const;

    /// Get the first position from pos that has a line break character.
    long GetFirstLineBreakPosition(long pos);

    /// Create default tabstop array
    static void InitDefaultTabs();

    /// Clear default tabstop array
    static void ClearDefaultTabs();

    /// Get default tabstop array
    static const wxArrayInt& GetDefaultTabs() { return sm_defaultTabs; }

protected:
    /// The lines that make up the wrapped paragraph
    wxRichTextLineList m_cachedLines;

    /// Default tabstops
    static wxArrayInt  sm_defaultTabs;
};

/*!
 * wxRichTextPlainText class declaration
 * This object represents a single piece of text.
 */

class WXDLLIMPEXP_RICHTEXT wxRichTextPlainText: public wxRichTextObject
{
    DECLARE_DYNAMIC_CLASS(wxRichTextPlainText)
public:
// Constructors

    wxRichTextPlainText(const wxString& text = wxEmptyString, wxRichTextObject* parent = NULL, wxTextAttrEx* style = NULL);
    wxRichTextPlainText(const wxRichTextPlainText& obj): wxRichTextObject() { Copy(obj); }

// Overrideables

    /// Draw the item
    virtual bool Draw(wxDC& dc, const wxRichTextRange& range, const wxRichTextRange& selectionRange, const wxRect& rect, int descent, int style);

    /// Lay the item out
    virtual bool Layout(wxDC& dc, const wxRect& rect, int style);

    /// Get/set the object size for the given range. Returns false if the range
    /// is invalid for this object.
    virtual bool GetRangeSize(const wxRichTextRange& range, wxSize& size, int& descent, wxDC& dc, int flags, wxPoint position/* = wxPoint(0,0)*/) const;

    /// Get any text in this object for the given range
    virtual wxString GetTextForRange(const wxRichTextRange& range) const;

    /// Do a split, returning an object containing the second part, and setting
    /// the first part in 'this'.
    virtual wxRichTextObject* DoSplit(long pos);

    /// Calculate range
    virtual void CalculateRange(long start, long& end);

    /// Delete range
    virtual bool DeleteRange(const wxRichTextRange& range);

    /// Returns true if the object is empty
    virtual bool IsEmpty() const { return m_text.empty(); }

    /// Returns true if this object can merge itself with the given one.
    virtual bool CanMerge(wxRichTextObject* object) const;

    /// Returns true if this object merged itself with the given one.
    /// The calling code will then delete the given object.
    virtual bool Merge(wxRichTextObject* object);

    /// Dump to output stream for debugging
    virtual void Dump(wxTextOutputStream& stream);

    /// Get the first position from pos that has a line break character.
    long GetFirstLineBreakPosition(long pos);

// Accessors

    /// Get the text
    const wxString& GetText() const { return m_text; }

    /// Set the text
    void SetText(const wxString& text) { m_text = text; }

// Operations

    /// Copy
    void Copy(const wxRichTextPlainText& obj);

    /// Clone
    virtual wxRichTextObject* Clone() const { return new wxRichTextPlainText(*this); }
private:
    bool DrawTabbedString(wxDC& dc, const wxTextAttrEx& attr, const wxRect& rect, wxString& str, wxCoord& x, wxCoord& y, bool selected);

protected:
    wxString    m_text;
};

/*!
 * wxRichTextImageBlock stores information about an image, in binary in-memory form
 */

class WXDLLIMPEXP_BASE wxDataInputStream;
class WXDLLIMPEXP_BASE wxDataOutputStream;

class WXDLLIMPEXP_RICHTEXT wxRichTextImageBlock: public wxObject
{
public:
    wxRichTextImageBlock();
    wxRichTextImageBlock(const wxRichTextImageBlock& block);
    virtual ~wxRichTextImageBlock();

    void Init();
    void Clear();

    // Load the original image into a memory block.
    // If the image is not a JPEG, we must convert it into a JPEG
    // to conserve space.
    // If it's not a JPEG we can make use of 'image', already scaled, so we don't have to
    // load the image a 2nd time.
    virtual bool MakeImageBlock(const wxString& filename, int imageType, wxImage& image, bool convertToJPEG = true);

    // Make an image block from the wxImage in the given
    // format.
    virtual bool MakeImageBlock(wxImage& image, int imageType, int quality = 80);

    // Write to a file
    bool Write(const wxString& filename);

    // Write data in hex to a stream
    bool WriteHex(wxOutputStream& stream);

    // Read data in hex from a stream
    bool ReadHex(wxInputStream& stream, int length, int imageType);

    // Copy from 'block'
    void Copy(const wxRichTextImageBlock& block);

    // Load a wxImage from the block
    bool Load(wxImage& image);

//// Operators
    void operator=(const wxRichTextImageBlock& block);

//// Accessors

    unsigned char* GetData() const { return m_data; }
    size_t GetDataSize() const { return m_dataSize; }
    int GetImageType() const { return m_imageType; }

    void SetData(unsigned char* image) { m_data = image; }
    void SetDataSize(size_t size) { m_dataSize = size; }
    void SetImageType(int imageType) { m_imageType = imageType; }

    bool Ok() const { return IsOk(); }
    bool IsOk() const { return GetData() != NULL; }

    // Gets the extension for the block's type
    wxString GetExtension() const;

/// Implementation

    // Allocate and read from stream as a block of memory
    static unsigned char* ReadBlock(wxInputStream& stream, size_t size);
    static unsigned char* ReadBlock(const wxString& filename, size_t size);

    // Write memory block to stream
    static bool WriteBlock(wxOutputStream& stream, unsigned char* block, size_t size);

    // Write memory block to file
    static bool WriteBlock(const wxString& filename, unsigned char* block, size_t size);

protected:
    // Size in bytes of the image stored.
    // This is in the raw, original form such as a JPEG file.
    unsigned char*      m_data;
    size_t              m_dataSize;
    int                 m_imageType; // wxWin type id
};


/*!
 * wxRichTextImage class declaration
 * This object represents an image.
 */

class WXDLLIMPEXP_RICHTEXT wxRichTextImage: public wxRichTextObject
{
    DECLARE_DYNAMIC_CLASS(wxRichTextImage)
public:
// Constructors

    wxRichTextImage(wxRichTextObject* parent = NULL): wxRichTextObject(parent) { }
    wxRichTextImage(const wxImage& image, wxRichTextObject* parent = NULL, wxTextAttrEx* charStyle = NULL);
    wxRichTextImage(const wxRichTextImageBlock& imageBlock, wxRichTextObject* parent = NULL, wxTextAttrEx* charStyle = NULL);
    wxRichTextImage(const wxRichTextImage& obj): wxRichTextObject() { Copy(obj); }

// Overrideables

    /// Draw the item
    virtual bool Draw(wxDC& dc, const wxRichTextRange& range, const wxRichTextRange& se