include/wx/htmllbox.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/htmllbox.h
   3 // Purpose:     wxHtmlListBox is a listbox whose items are wxHtmlCells
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     31.05.03
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2003 Vadim Zeitlin <vadim@wxwindows.org>
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_HTMLLBOX_H_
  13 #define _WX_HTMLLBOX_H_
  14
  15 #include "wx/vlbox.h"               // base class
  16
  17 class WXDLLEXPORT wxHtmlCell;
  18 class WXDLLEXPORT wxHtmlWinParser;
  19 class WXDLLEXPORT wxHtmlListBoxCache;
  20 class WXDLLEXPORT wxHtmlListBoxStyle;
  21
  22 // ----------------------------------------------------------------------------
  23 // wxHtmlListBox
  24 // ----------------------------------------------------------------------------
  25
  26 class WXDLLEXPORT wxHtmlListBox : public wxVListBox
  27 {
  28 public:
  29     // constructors and such
  30     // ---------------------
  31
  32     // default constructor, you must call Create() later
  33     wxHtmlListBox() { Init(); }
  34
  35     // normal constructor which calls Create() internally
  36     wxHtmlListBox(wxWindow *parent,
  37                   wxWindowID id = wxID_ANY,
  38                   const wxPoint& pos = wxDefaultPosition,
  39                   const wxSize& size = wxDefaultSize,
  40                   long style = 0,
  41                   const wxString& name = wxVListBoxNameStr)
  42     {
  43         Init();
  44
  45         (void)Create(parent, id, pos, size, style, name);
  46     }
  47
  48     // really creates the control and sets the initial number of items in it
  49     // (which may be changed later with SetItemCount())
  50     //
  51     // the only special style which may be specified here is wxLB_MULTIPLE
  52     //
  53     // returns true on success or false if the control couldn't be created
  54     bool Create(wxWindow *parent,
  55                 wxWindowID id = wxID_ANY,
  56                 const wxPoint& pos = wxDefaultPosition,
  57                 const wxSize& size = wxDefaultSize,
  58                 long style = 0,
  59                 const wxString& name = wxVListBoxNameStr);
  60
  61     // destructor cleans up whatever resources we use
  62     virtual ~wxHtmlListBox();
  63
  64     // override some base class virtuals
  65     virtual void RefreshAll();
  66     virtual void SetItemCount(size_t count);
  67
  68 protected:
  69     // this method must be implemented in the derived class and should return
  70     // the body (i.e. without <html>) of the HTML for the given item
  71     virtual wxString OnGetItem(size_t n) const = 0;
  72
  73     // this function may be overridden to decorate HTML returned by OnGetItem()
  74     virtual wxString OnGetItemMarkup(size_t n) const;
  75
  76
  77     // this method allows to customize the selection appearance: it may be used
  78     // to specify the colour of the text which normally has the given colour
  79     // colFg when it is inside the selection
  80     //
  81     // by default, the original colour is not used at all and all text has the
  82     // same (default for this system) colour inside selection
  83     virtual wxColour GetSelectedTextColour(const wxColour& colFg) const;
  84
  85     // this is the same as GetSelectedTextColour() but allows to customize the
  86     // background colour -- this is even more rarely used as you can change it
  87     // globally using SetSelectionBackground()
  88     virtual wxColour GetSelectedTextBgColour(const wxColour& colBg) const;
  89
  90
  91     // we implement both of these functions in terms of OnGetItem(), they are
  92     // not supposed to be overridden by our descendants
  93     virtual void OnDrawItem(wxDC& dc, const wxRect& rect, size_t n) const;
  94     virtual wxCoord OnMeasureItem(size_t n) const;
  95
  96
  97     // event handlers
  98     void OnSize(wxSizeEvent& event);
  99
 100
 101     // common part of all ctors
 102     void Init();
 103
 104     // ensure that the given item is cached
 105     void CacheItem(size_t n) const;
 106
 107 private:
 108     // this class caches the pre-parsed HTML to speed up display
 109     wxHtmlListBoxCache *m_cache;
 110
 111     // HTML parser we use
 112     wxHtmlWinParser *m_htmlParser;
 113
 114     // rendering style for the parser which allows us to customize our colours
 115     wxHtmlListBoxStyle *m_htmlRendStyle;
 116
 117
 118     // it calls our GetSelectedTextColour() and GetSelectedTextBgColour()
 119     friend class wxHtmlListBoxStyle;
 120
 121
 122     DECLARE_EVENT_TABLE()
 123 };
 124
 125 #endif // _WX_HTMLLBOX_H_
 126