user/wxLayout/wxllist.h

   1 /*-*- c++ -*-********************************************************
   2  * wxLayoutList.h - a formatted text rendering engine for wxWindows *
   3  *                                                                  *
   4  * (C) 1998 by Karsten Ballüder (Ballueder@usa.net)                 *
   5  *                                                                  *
   6  * $Id$
   7  *******************************************************************/
   8 #ifndef WXLLIST_H
   9 #define WXLLIST_H
  10
  11 #ifdef __GNUG__
  12 #   pragma interface "wxllist.h"
  13 #endif
  14
  15 #include   "kbList.h"
  16
  17 #include   <wx/wx.h>
  18
  19 // skip the following defines if embedded in M application
  20 #ifndef   MCONFIG_H
  21 // for testing only:
  22 #   define WXLAYOUT_DEBUG
  23 //#   define USE_STD_STRING
  24 #endif
  25
  26 #ifdef USE_STD_STRING
  27 #   include   <string>
  28     typedef   std::string String;
  29 #   define    Str(str)(str.c_str())
  30 #else
  31     typedef   wxString String;
  32 #   define    Str(str) str
  33 #endif
  34
  35 enum wxLayoutObjectType { WXLO_TYPE_INVALID, WXLO_TYPE_TEXT, WXLO_TYPE_CMD, WXLO_TYPE_ICON, WXLO_TYPE_LINEBREAK };
  36
  37 typedef long CoordType;
  38
  39 class wxLayoutList;
  40 class wxLayoutObjectBase;
  41
  42 KBLIST_DEFINE(wxLayoutObjectList, wxLayoutObjectBase);
  43 KBLIST_DEFINE(wxLayoutOLinesList, wxLayoutObjectList::iterator);
  44
  45
  46 class wxLayoutObjectBase
  47 {
  48 public:
  49    virtual wxLayoutObjectType GetType(void) const { return WXLO_TYPE_INVALID; } ;
  50    /** Draws an object.
  51        @param dc the wxDC to draw on
  52        @param position where to draw the top left corner
  53        @param baseLine the baseline for alignment, from top of box
  54        @draw if set to false, do not draw but just calculate sizes
  55    */
  56    virtual void Draw(wxDC &dc, wxPoint position, CoordType baseLine,
  57                      bool draw = true) {};
  58
  59    virtual wxPoint GetSize(CoordType *baseLine) const { return
  60                                                            wxPoint(0,0); };
  61    /// returns the number of cursor positions occupied by this object
  62    virtual CoordType CountPositions(void) const { return 1; }
  63
  64    wxLayoutObjectBase() { m_UserData = NULL; }
  65    virtual ~wxLayoutObjectBase() { if(m_UserData) delete m_UserData; }
  66 #ifdef WXLAYOUT_DEBUG
  67    virtual void Debug(void);
  68 #endif
  69
  70    void   SetUserData(void *data) { m_UserData = data; }
  71    void * GetUserData(void) const { return m_UserData; }
  72 private:
  73    /// optional data for application's use
  74    void * m_UserData;
  75 };
  76
  77 /// object for text block
  78 class wxLayoutObjectText : public wxLayoutObjectBase
  79 {
  80 public:
  81    virtual wxLayoutObjectType GetType(void) const { return WXLO_TYPE_TEXT; }
  82    virtual void Draw(wxDC &dc, wxPoint position, CoordType baseLine,
  83                      bool draw = true);
  84    /** This returns the height and in baseLine the position of the
  85        text's baseline within it's box. This is needed to properly
  86        align text objects.
  87    */
  88    virtual wxPoint GetSize(CoordType *baseLine) const;
  89 #ifdef WXLAYOUT_DEBUG
  90    virtual void Debug(void);
  91 #endif
  92
  93    wxLayoutObjectText(const String &txt);
  94    virtual CoordType CountPositions(void) const { return strlen(m_Text.c_str()); }
  95
  96    // for editing:
  97    String & GetText(void) { return m_Text; }
  98    void SetText(String const &text) { m_Text = text; }
  99 private:
 100    String m_Text;
 101    /// size of the box containing text
 102    long   m_Width, m_Height;
 103    /// the position of the baseline counted from the top of the box
 104    long   m_BaseLine;
 105 };
 106
 107 /// icon/pictures:
 108 class wxLayoutObjectIcon : public wxLayoutObjectBase
 109 {
 110 public:
 111    virtual wxLayoutObjectType GetType(void) const { return WXLO_TYPE_ICON; }
 112    virtual void Draw(wxDC &dc, wxPoint position, CoordType baseLine,
 113                      bool draw = true);
 114    virtual wxPoint GetSize(CoordType *baseLine) const;
 115    wxLayoutObjectIcon(wxIcon *icon);
 116 private:
 117    wxIcon * m_Icon;
 118 };
 119
 120 /// for export to html:
 121 struct wxLayoutStyleInfo
 122 {
 123    int  size, family, style, weight;
 124    bool underline;
 125    unsigned fg_red, fg_green, fg_blue;
 126    unsigned bg_red, bg_green, bg_blue;
 127 };
 128
 129 /// pseudo-object executing a formatting command in Draw()
 130 class wxLayoutObjectCmd : public wxLayoutObjectBase
 131 {
 132 public:
 133    virtual wxLayoutObjectType GetType(void) const { return WXLO_TYPE_CMD; }
 134    virtual void Draw(wxDC &dc, wxPoint position, CoordType baseLine,
 135                      bool draw = true);
 136    wxLayoutObjectCmd(int size, int family, int style, int weight,
 137                 bool underline,
 138                 wxColour const *fg, wxColour const *bg);
 139    ~wxLayoutObjectCmd();
 140    // caller must free pointer:
 141    wxLayoutStyleInfo *GetStyle(void) const ;
 142 private:
 143    /// the font to use
 144    wxFont *m_font;
 145    /// foreground colour
 146    wxColour const *m_ColourFG;
 147    /// background colour
 148    wxColour const *m_ColourBG;
 149 };
 150
 151 /// this object doesn't do anything at all
 152 class wxLayoutObjectLineBreak : public wxLayoutObjectBase
 153 {
 154 public:
 155    virtual wxLayoutObjectType GetType(void) const { return WXLO_TYPE_LINEBREAK; }
 156 };
 157
 158
 159 /**
 160    This class provides a high level abstraction to the wxFText
 161    classes.
 162    It handles most of the character events with its own callback
 163    functions, providing an editing ability. All events which cannot be
 164    handled get passed to the parent window's handlers.
 165 */
 166 class wxLayoutList : public wxLayoutObjectList
 167 {
 168 public:
 169    wxLayoutList();
 170
 171    /// Destructor.
 172    ~wxLayoutList();
 173
 174    /// adds an object:
 175    void AddObject(wxLayoutObjectBase *obj);
 176    void AddText(String const &txt);
 177
 178    void LineBreak(void);
 179    void SetFont(int family, int size, int style,
 180                 int weight, int underline,
 181                 wxColour const *fg,
 182                 wxColour const *bg);
 183    void SetFont(int family=-1, int size = -1, int style=-1,
 184                 int weight=-1, int underline = -1,
 185                 char const *fg = NULL,
 186                 char const *bg = NULL);
 187    inline void SetFontFamily(int family) { SetFont(family); }
 188    inline void SetFontSize(int size) { SetFont(-1,size); }
 189    inline void SetFontStyle(int style) { SetFont(-1,-1,style); }
 190    inline void SetFontWeight(int weight) { SetFont(-1,-1,-1,weight); }
 191    inline void SetFontUnderline(bool ul) { SetFont(-1,-1,-1,-1,(int)ul); }
 192    inline void SetFontColour(char const *fg, char const *bg = NULL) { SetFont(-1,-1,-1,-1,-1,fg,bg); }
 193
 194
 195    /** Draw the list on a given DC.
 196        @param findObject if true, return the object occupying the
 197        position specified by coords
 198        @param coords position where to find the object
 199        @return if findObject == true, the object or NULL
 200    */
 201    wxLayoutObjectBase *Draw(wxDC &dc, bool findObject = false,
 202                        wxPoint const &coords = wxPoint(0,0));
 203
 204 #ifdef WXLAYOUT_DEBUG
 205    void Debug(void);
 206 #endif
 207
 208
 209    /// for access by wxLayoutWindow:
 210    void GetSize(CoordType *max_x, CoordType *max_y,
 211                 CoordType *lineHeight);
 212
 213    /**@name Functionality for editing */
 214    //@{
 215    /// set list editable or read only
 216    void SetEditable(bool editable = true) { m_Editable = true; }
 217    /// move cursor
 218    void MoveCursor(int dx = 0, int dy = 0);
 219    void SetCursor(wxPoint const &p) { m_CursorPosition = p; }
 220    /// delete one or more cursor positions
 221    void Delete(CoordType count = 1);
 222    void Insert(String const &text);
 223    void Insert(wxLayoutObjectBase *obj);
 224    void Clear(int family = wxROMAN, int size=12, int style=wxNORMAL, int weight=wxNORMAL,
 225                     int underline=0, char const *fg="black", char const *bg="white");
 226
 227    //@}
 228 protected:
 229    /// font parameters:
 230    int m_FontFamily, m_FontStyle, m_FontWeight;
 231    int m_FontPtSize;
 232    bool m_FontUnderline;
 233    /// colours:
 234    wxColour const * m_ColourFG;
 235    wxColour const * m_ColourBG;
 236    /// the default setting:
 237    wxLayoutObjectCmd *m_DefaultSetting;
 238
 239    /// needs recalculation?
 240    bool m_dirty;
 241
 242    // the currently updated line:
 243    /// where do we draw next:
 244    wxPoint   m_Position;
 245    /// the height of the current line:
 246    CoordType m_LineHeight;
 247    /// maximum drawn x position so far
 248    CoordType m_MaxX;
 249    /// maximum drawn y position:
 250    CoordType m_MaxY;
 251
 252    //---- this is needed for editing:
 253    /// where is the text cursor:
 254    wxPoint   m_CursorPosition;
 255    /// which is the last line
 256    CoordType m_MaxLine;
 257    /// can we edit it?
 258    bool      m_Editable;
 259    /// find the object to the cursor position and returns the offset
 260    /// in there
 261    wxLayoutObjectList::iterator FindObjectCursor(wxPoint const &cpos, CoordType *offset = NULL);
 262    wxLayoutObjectList::iterator FindCurrentObject(CoordType *offset = NULL);
 263    // get the length of the line with the object pointed to by i
 264    CoordType GetLineLength(wxLayoutObjectList::iterator i);
 265
 266 };
 267
 268 #endif // WXLLIST_H