include/wx/ownerdrw.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        ownerdrw.h
   3 // Purpose:     interface for owner-drawn GUI elements
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     11.11.97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows license
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef   _OWNERDRW_H
  13 #define   _OWNERDRW_H
  14
  15 #ifdef    __GNUG__
  16 #pragma interface "ownerdrw.h"
  17 #endif
  18
  19 typedef   wxColour      wxColor;
  20 typedef   unsigned int  size_t;
  21
  22 // ----------------------------------------------------------------------------
  23 // wxOwnerDrawn - a mix-in base class, derive from it to implement owner-drawn
  24 //                behaviour
  25 //
  26 // wxOwnerDrawn supports drawing of an item with non standard font, color and
  27 // also supports 3 bitmaps: either a checked/unchecked bitmap for a checkable
  28 // element or one unchangeable bitmap otherwise.
  29 // ----------------------------------------------------------------------------
  30 class WXDLLEXPORT wxOwnerDrawn
  31 {
  32 public:
  33   // ctor & dtor
  34   wxOwnerDrawn(const wxString& str = "",
  35                bool bCheckable = FALSE,
  36                bool bMenuItem = FALSE); // @@ kludge for colors
  37   virtual ~wxOwnerDrawn() { }
  38
  39   // fix appearance
  40   inline void SetFont(const wxFont& font)
  41   { m_font = font; m_bOwnerDrawn = TRUE; }
  42
  43   inline wxFont& GetFont() const { return (wxFont &)m_font; }
  44
  45   inline void SetTextColour(const wxColour& colText)
  46   { m_colText = colText; m_bOwnerDrawn = TRUE; }
  47
  48   inline wxColour& GetTextColour() const { return (wxColour&) m_colText; }
  49
  50   inline void SetBackgroundColour(const wxColour& colBack)
  51   { m_colBack = colBack; m_bOwnerDrawn = TRUE; }
  52
  53   inline wxColour& GetBackgroundColour() const
  54   { return (wxColour&) m_colBack ; }
  55
  56   inline void SetBitmaps(const wxBitmap& bmpChecked,
  57                          const wxBitmap& bmpUnchecked = wxNullBitmap)
  58   { m_bmpChecked = bmpChecked;
  59     m_bmpUnchecked = bmpUnchecked;
  60     m_bOwnerDrawn = TRUE;          }
  61
  62   inline wxBitmap& GetBitmap(bool bChecked = TRUE) const
  63   { return (wxBitmap &)(bChecked ? m_bmpChecked : m_bmpUnchecked); }
  64
  65   // the height of the menu checkmark (or bitmap) is determined by the font
  66   // for the current item, but the width should be always the same (for the
  67   // items to be aligned), so by default it's taken to be the same as for
  68   // the last item (and default width for the first one).
  69   //
  70   // NB: default is too small for bitmaps, but ok for checkmarks.
  71   inline void SetMarginWidth(int nWidth)
  72   { ms_nLastMarginWidth = m_nMarginWidth = (size_t) nWidth;
  73     if ( ((size_t) nWidth) != ms_nDefaultMarginWidth ) m_bOwnerDrawn = TRUE; }
  74
  75   inline int GetMarginWidth() const { return (int) m_nMarginWidth; }
  76   inline static int GetDefaultMarginWidth() { return (int) ms_nDefaultMarginWidth; }
  77
  78   // accessors
  79   void            SetName(const wxString& strName)  { m_strName = strName; }
  80   const wxString& GetName()       const             { return m_strName;    }
  81   bool            IsCheckable()   const             { return m_bCheckable; }
  82
  83   // this function might seem strange, but if it returns FALSE it means that
  84   // no non-standard attribute are set, so there is no need for this control
  85   // to be owner-drawn. Moreover, you can force owner-drawn to FALSE if you
  86   // want to change, say, the color for the item but only if it is owner-drawn
  87   // (see wxMenuItem::wxMenuItem for example)
  88   inline bool     IsOwnerDrawn()  const             { return m_bOwnerDrawn;   }
  89   inline void     ResetOwnerDrawn()                 { m_bOwnerDrawn = FALSE;  }
  90
  91 public:
  92   // constants used in OnDrawItem
  93   // (they have the same values as corresponding Win32 constants)
  94   enum wxODAction
  95   {
  96     wxODDrawAll       = 0x0001,   // redraw entire control
  97     wxODSelectChanged = 0x0002,   // selection changed (see Status.Select)
  98     wxODFocusChanged  = 0x0004,   // keyboard focus changed (see Status.Focus)
  99   };
 100
 101   enum wxODStatus
 102   {
 103     wxODSelected  = 0x0001,         // control is currently selected
 104     wxODGrayed    = 0x0002,         // item is to be grayed
 105     wxODDisabled  = 0x0004,         // item is to be drawn as disabled
 106     wxODChecked   = 0x0008,         // item is to be checked
 107     wxODHasFocus  = 0x0010,         // item has the keyboard focus
 108     wxODDefault   = 0x0020,         // item is the default item
 109   };
 110
 111   // virtual functions to implement drawing (return TRUE if processed)
 112   virtual bool OnMeasureItem(size_t *pwidth, size_t *pheight);
 113   virtual bool OnDrawItem(wxDC& dc, const wxRect& rc, wxODAction act, wxODStatus stat);
 114
 115 protected:
 116   wxString  m_strName;      // label for a manu item
 117
 118 private:
 119   static size_t ms_nDefaultMarginWidth; // menu check mark width
 120   static size_t ms_nLastMarginWidth;    // handy for aligning all items
 121
 122   bool      m_bCheckable,   // used only for menu or check listbox items
 123             m_bOwnerDrawn;  // true if something is non standard
 124
 125   wxFont    m_font;         // font to use for drawing
 126   wxColor   m_colText,      // color ----"---"---"----
 127             m_colBack;      // background color
 128   wxBitmap  m_bmpChecked,   // bitmap to put near the item
 129             m_bmpUnchecked; // (checked is used also for 'uncheckable' items)
 130
 131   size_t      m_nHeight,      // font height
 132             m_nMarginWidth; // space occupied by bitmap to the left of the item
 133 };
 134
 135 #endif  //_OWNERDRW_H