src/generic/htmllbox.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        generic/htmllbox.cpp
   3 // Purpose:     implementation of wxHtmlListBox
   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 // License:     wxWidgets license
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #ifndef WX_PRECOMP
  28     #include "wx/dcclient.h"
  29 #endif //WX_PRECOMP
  30
  31 #if wxUSE_HTML
  32
  33 #include "wx/htmllbox.h"
  34
  35 #include "wx/html/htmlcell.h"
  36 #include "wx/html/winpars.h"
  37
  38 // this hack forces the linker to always link in m_* files
  39 #include "wx/html/forcelnk.h"
  40 FORCE_WXHTML_MODULES()
  41
  42 // ============================================================================
  43 // private classes
  44 // ============================================================================
  45
  46 // ----------------------------------------------------------------------------
  47 // wxHtmlListBoxCache
  48 // ----------------------------------------------------------------------------
  49
  50 // this class is used by wxHtmlListBox to cache the parsed representation of
  51 // the items to avoid doing it anew each time an item must be drawn
  52 class wxHtmlListBoxCache
  53 {
  54 public:
  55     wxHtmlListBoxCache()
  56     {
  57         for ( size_t n = 0; n < SIZE; n++ )
  58         {
  59             m_items[n] = (size_t)-1;
  60             m_cells[n] = NULL;
  61         }
  62
  63         m_next = 0;
  64     }
  65
  66     ~wxHtmlListBoxCache()
  67     {
  68         for ( size_t n = 0; n < SIZE; n++ )
  69         {
  70             delete m_cells[n];
  71         }
  72     }
  73
  74     // completely invalidate the cache
  75     void Clear()
  76     {
  77         for ( size_t n = 0; n < SIZE; n++ )
  78         {
  79             m_items[n] = (size_t)-1;
  80             delete m_cells[n];
  81             m_cells[n] = NULL;
  82         }
  83     }
  84
  85     // return the cached cell for this index or NULL if none
  86     wxHtmlCell *Get(size_t item) const
  87     {
  88         for ( size_t n = 0; n < SIZE; n++ )
  89         {
  90             if ( m_items[n] == item )
  91                 return m_cells[n];
  92         }
  93
  94         return NULL;
  95     }
  96
  97     // returns true if we already have this item cached
  98     bool Has(size_t item) const { return Get(item) != NULL; }
  99
 100     // ensure that the item is cached
 101     void Store(size_t item, wxHtmlCell *cell)
 102     {
 103         delete m_cells[m_next];
 104         m_cells[m_next] = cell;
 105         m_items[m_next] = item;
 106
 107         // advance to the next item wrapping around if there are no more
 108         if ( ++m_next == SIZE )
 109             m_next = 0;
 110     }
 111
 112 private:
 113     // the max number of the items we cache
 114     enum { SIZE = 50 };
 115
 116     // the index of the LRU (oldest) cell
 117     size_t m_next;
 118
 119     // the parsed representation of the cached item or NULL
 120     wxHtmlCell *m_cells[SIZE];
 121
 122     // the index of the currently cached item (only valid if m_cells != NULL)
 123     size_t m_items[SIZE];
 124 };
 125
 126 // ----------------------------------------------------------------------------
 127 // wxHtmlListBoxStyle
 128 // ----------------------------------------------------------------------------
 129
 130 // just forward wxDefaultHtmlRenderingStyle callbacks to the main class so that
 131 // they could be overridden by the user code
 132 class wxHtmlListBoxStyle : public wxDefaultHtmlRenderingStyle
 133 {
 134 public:
 135     wxHtmlListBoxStyle(wxHtmlListBox& hlbox) : m_hlbox(hlbox) { }
 136
 137     virtual wxColour GetSelectedTextColour(const wxColour& colFg)
 138     {
 139         return m_hlbox.GetSelectedTextColour(colFg);
 140     }
 141
 142     virtual wxColour GetSelectedTextBgColour(const wxColour& colBg)
 143     {
 144         return m_hlbox.GetSelectedTextBgColour(colBg);
 145     }
 146
 147 private:
 148     const wxHtmlListBox& m_hlbox;
 149
 150     DECLARE_NO_COPY_CLASS(wxHtmlListBoxStyle)
 151 };
 152
 153
 154 // ----------------------------------------------------------------------------
 155 // event tables
 156 // ----------------------------------------------------------------------------
 157
 158 BEGIN_EVENT_TABLE(wxHtmlListBox, wxVListBox)
 159     EVT_SIZE(wxHtmlListBox::OnSize)
 160 END_EVENT_TABLE()
 161
 162 // ============================================================================
 163 // implementation
 164 // ============================================================================
 165
 166 IMPLEMENT_ABSTRACT_CLASS(wxHtmlListBox, wxVListBox)
 167
 168
 169 // ----------------------------------------------------------------------------
 170 // wxHtmlListBox creation
 171 // ----------------------------------------------------------------------------
 172
 173 void wxHtmlListBox::Init()
 174 {
 175     m_htmlParser = NULL;
 176     m_htmlRendStyle = new wxHtmlListBoxStyle(*this);
 177     m_cache = new wxHtmlListBoxCache;
 178 }
 179
 180 bool wxHtmlListBox::Create(wxWindow *parent,
 181                            wxWindowID id,
 182                            const wxPoint& pos,
 183                            const wxSize& size,
 184                            long style,
 185                            const wxString& name)
 186 {
 187     return wxVListBox::Create(parent, id, pos, size, style, name);
 188 }
 189
 190 wxHtmlListBox::~wxHtmlListBox()
 191 {
 192     delete m_cache;
 193
 194     if ( m_htmlParser )
 195     {
 196         delete m_htmlParser->GetDC();
 197         delete m_htmlParser;
 198     }
 199
 200     delete m_htmlRendStyle;
 201 }
 202
 203 // ----------------------------------------------------------------------------
 204 // wxHtmlListBox appearance
 205 // ----------------------------------------------------------------------------
 206
 207 wxColour wxHtmlListBox::GetSelectedTextColour(const wxColour& colFg) const
 208 {
 209     return m_htmlRendStyle->
 210                 wxDefaultHtmlRenderingStyle::GetSelectedTextColour(colFg);
 211 }
 212
 213 wxColour
 214 wxHtmlListBox::GetSelectedTextBgColour(const wxColour& WXUNUSED(colBg)) const
 215 {
 216     return GetSelectionBackground();
 217 }
 218
 219 // ----------------------------------------------------------------------------
 220 // wxHtmlListBox items markup
 221 // ----------------------------------------------------------------------------
 222
 223 wxString wxHtmlListBox::OnGetItemMarkup(size_t n) const
 224 {
 225     // we don't even need to wrap the value returned by OnGetItem() inside
 226     // "<html><body>" and "</body></html>" because wxHTML can parse it even
 227     // without these tags
 228     return OnGetItem(n);
 229 }
 230
 231 // ----------------------------------------------------------------------------
 232 // wxHtmlListBox cache handling
 233 // ----------------------------------------------------------------------------
 234
 235 void wxHtmlListBox::CacheItem(size_t n) const
 236 {
 237     if ( !m_cache->Has(n) )
 238     {
 239         if ( !m_htmlParser )
 240         {
 241             wxHtmlListBox *self = wxConstCast(this, wxHtmlListBox);
 242
 243             self->m_htmlParser = new wxHtmlWinParser;
 244             m_htmlParser->SetDC(new wxClientDC(self));
 245             m_htmlParser->SetFS(&self->m_filesystem);
 246         }
 247
 248         wxHtmlContainerCell *cell = (wxHtmlContainerCell *)m_htmlParser->
 249                 Parse(OnGetItemMarkup(n));
 250         wxCHECK_RET( cell, _T("wxHtmlParser::Parse() returned NULL?") );
 251
 252         cell->Layout(GetClientSize().x - 2*GetMargins().x);
 253
 254         m_cache->Store(n, cell);
 255     }
 256 }
 257
 258 void wxHtmlListBox::OnSize(wxSizeEvent& event)
 259 {
 260     // we need to relayout all the cached cells
 261     m_cache->Clear();
 262
 263     event.Skip();
 264 }
 265
 266 void wxHtmlListBox::RefreshAll()
 267 {
 268     m_cache->Clear();
 269
 270     wxVListBox::RefreshAll();
 271 }
 272
 273 void wxHtmlListBox::SetItemCount(size_t count)
 274 {
 275     // the items are going to change, forget the old ones
 276     m_cache->Clear();
 277
 278     wxVListBox::SetItemCount(count);
 279 }
 280
 281 // ----------------------------------------------------------------------------
 282 // wxHtmlListBox implementation of wxVListBox pure virtuals
 283 // ----------------------------------------------------------------------------
 284
 285 void wxHtmlListBox::OnDrawItem(wxDC& dc, const wxRect& rect, size_t n) const
 286 {
 287     CacheItem(n);
 288
 289     wxHtmlCell *cell = m_cache->Get(n);
 290     wxCHECK_RET( cell, _T("this cell should be cached!") );
 291
 292     wxHtmlRenderingInfo htmlRendInfo;
 293
 294     // draw the selected cell in selected state
 295     if ( IsSelected(n) )
 296     {
 297         wxHtmlSelection htmlSel;
 298         htmlSel.Set(wxPoint(0, 0), cell, wxPoint(INT_MAX, INT_MAX), cell);
 299         htmlRendInfo.SetSelection(&htmlSel);
 300         if ( m_htmlRendStyle )
 301             htmlRendInfo.SetStyle(m_htmlRendStyle);
 302         htmlRendInfo.GetState().SetSelectionState(wxHTML_SEL_IN);
 303     }
 304
 305     // note that we can't stop drawing exactly at the window boundary as then
 306     // even the visible cells part could be not drawn, so always draw the
 307     // entire cell
 308     cell->Draw(dc, rect.x+2, rect.y+2, 0, INT_MAX, htmlRendInfo);
 309 }
 310
 311 wxCoord wxHtmlListBox::OnMeasureItem(size_t n) const
 312 {
 313     CacheItem(n);
 314
 315     wxHtmlCell *cell = m_cache->Get(n);
 316     wxCHECK_MSG( cell, 0, _T("this cell should be cached!") );
 317
 318     return cell->GetHeight() + cell->GetDescent() + 4;
 319 }
 320
 321 #endif