src/common/stattextcmn.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/stattextcmn.cpp
   3 // Purpose:     common (to all ports) wxStaticText functions
   4 // Author:      Vadim Zeitlin, Francesco Montorsi
   5 // Created:     2007-01-07 (extracted from dlgcmn.cpp)
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 1999-2006 Vadim Zeitlin
   8 //              (c) 2007 Francesco Montorsi
   9 // Licence:     wxWindows licence
  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 #include "wx/private/stattext.h"
  28
  29 #ifndef WX_PRECOMP
  30     #include "wx/button.h"
  31     #include "wx/dcclient.h"
  32     #include "wx/intl.h"
  33     #include "wx/log.h"
  34     #include "wx/settings.h"
  35     #include "wx/stattext.h"
  36     #include "wx/sizer.h"
  37     #include "wx/containr.h"
  38 #endif
  39
  40 const wxChar *wxMarkupEntities[][wxMARKUP_ENTITY_MAX] =
  41 {
  42     // the entities handled by SetLabel() when wxST_MARKUP is used and their referenced string
  43
  44     { wxT("&amp;"), wxT("&lt;"), wxT("&gt;"), wxT("&apos;"), wxT("&quot;") },
  45     { wxT("&"),     wxT("<"),    wxT(">"),    wxT("'"),      wxT("\"")     }
  46 };
  47
  48 #if wxUSE_STATTEXT
  49
  50 // ----------------------------------------------------------------------------
  51 // wxTextWrapper
  52 // ----------------------------------------------------------------------------
  53
  54 void wxTextWrapper::Wrap(wxWindow *win, const wxString& text, int widthMax)
  55 {
  56     wxString line;
  57
  58     wxString::const_iterator lastSpace = text.end();
  59     wxString::const_iterator lineStart = text.begin();
  60     for ( wxString::const_iterator p = lineStart; ; ++p )
  61     {
  62         if ( IsStartOfNewLine() )
  63         {
  64             OnNewLine();
  65
  66             lastSpace = text.end();
  67             line.clear();
  68             lineStart = p;
  69         }
  70
  71         if ( p == text.end() || *p == _T('\n') )
  72         {
  73             DoOutputLine(line);
  74
  75             if ( p == text.end() )
  76                 break;
  77         }
  78         else // not EOL
  79         {
  80             if ( *p == _T(' ') )
  81                 lastSpace = p;
  82
  83             line += *p;
  84
  85             if ( widthMax >= 0 && lastSpace != text.end() )
  86             {
  87                 int width;
  88                 win->GetTextExtent(line, &width, NULL);
  89
  90                 if ( width > widthMax )
  91                 {
  92                     // remove the last word from this line
  93                     line.erase(lastSpace - lineStart, p + 1 - lineStart);
  94                     DoOutputLine(line);
  95
  96                     // go back to the last word of this line which we didn't
  97                     // output yet
  98                     p = lastSpace;
  99                 }
 100             }
 101             //else: no wrapping at all or impossible to wrap
 102         }
 103     }
 104 }
 105
 106
 107 // ----------------------------------------------------------------------------
 108 // wxLabelWrapper: helper class for wxStaticTextBase::Wrap()
 109 // ----------------------------------------------------------------------------
 110
 111 class wxLabelWrapper : public wxTextWrapper
 112 {
 113 public:
 114     void WrapLabel(wxWindow *text, int widthMax)
 115     {
 116         m_text.clear();
 117         Wrap(text, text->GetLabel(), widthMax);
 118         text->SetLabel(m_text);
 119     }
 120
 121 protected:
 122     virtual void OnOutputLine(const wxString& line)
 123     {
 124         m_text += line;
 125     }
 126
 127     virtual void OnNewLine()
 128     {
 129         m_text += _T('\n');
 130     }
 131
 132 private:
 133     wxString m_text;
 134 };
 135
 136
 137 // ----------------------------------------------------------------------------
 138 // wxStaticTextBase
 139 // ----------------------------------------------------------------------------
 140
 141 void wxStaticTextBase::Wrap(int width)
 142 {
 143     wxLabelWrapper wrapper;
 144     wrapper.WrapLabel(this, width);
 145 }
 146
 147 wxString wxStaticTextBase::GetLabelText() const
 148 {
 149     wxString ret(GetLabel());
 150
 151     if (HasFlag(wxST_MARKUP))
 152         ret = RemoveMarkup(ret);
 153     return RemoveMnemonics(ret);
 154 }
 155
 156 /*static*/
 157 wxString wxStaticTextBase::GetLabelText(const wxString& label)
 158 {
 159     // remove markup
 160     wxString ret = RemoveMarkup(label);
 161     return RemoveMnemonics(ret);
 162 }
 163
 164 /*static*/
 165 wxString wxStaticTextBase::RemoveMarkup(const wxString& text)
 166 {
 167     // strip out of "text" the markup for platforms which don't support it natively
 168     bool inside_tag = false;
 169
 170     wxString label;
 171     for ( wxString::const_iterator source = text.begin();
 172           source != text.end(); ++source )
 173     {
 174         switch ( (*source).GetValue() )
 175         {
 176             case wxT('<'):
 177                 if (inside_tag)
 178                 {
 179                     wxLogDebug(wxT("Invalid markup !"));
 180                     return wxEmptyString;
 181                 }
 182                 inside_tag = true;
 183                 break;
 184
 185             case wxT('>'):
 186                 if (!inside_tag)
 187                 {
 188                     wxLogDebug(wxT("Invalid markup !"));
 189                     return wxEmptyString;
 190                 }
 191                 inside_tag = false;
 192                 break;
 193
 194             case wxT('&'):
 195                 {
 196                     if ( source+1 == text.end() )
 197                     {
 198                         wxLogDebug(wxT("Cannot use & as last character of the string '%s'"),
 199                                    text.c_str());
 200                         return wxEmptyString;
 201                     }
 202
 203                     // is this ampersand introducing a mnemonic or rather an entity?
 204                     bool isMnemonic = true;
 205                     size_t distanceFromEnd = text.end() - source;
 206                     for (size_t j=0; j < wxMARKUP_ENTITY_MAX; j++)
 207                     {
 208                         const wxChar *entity = wxMarkupEntities[wxMARKUP_ELEMENT_NAME][j];
 209                         size_t entityLen = wxStrlen(entity);
 210
 211                         if (distanceFromEnd >= entityLen &&
 212                             wxString(source, source + entityLen) == entity)
 213                         {
 214                             // replace the &entity; string with the entity reference
 215                             label << wxMarkupEntities[wxMARKUP_ELEMENT_VALUE][j];
 216                             // little exception: when the entity reference is
 217                             // "&" (i.e. when entity is "&amp;"), substitute it
 218                             // with && instead of a single ampersand:
 219                             if (*wxMarkupEntities[wxMARKUP_ELEMENT_VALUE][j] == wxT('&'))
 220                                 label << wxT('&');
 221                             // the -1 is because main for() loop already
 222                             // increments i:
 223                             source += entityLen - 1;
 224                             isMnemonic = false;
 225                             break;
 226                         }
 227                     }
 228
 229                     if (isMnemonic)
 230                         label << *source;
 231                 }
 232                 break;
 233
 234
 235             default:
 236                 if (!inside_tag)
 237                     label << *source;
 238         }
 239     }
 240
 241     return label;
 242 }
 243
 244 /* static */
 245 wxString wxStaticTextBase::EscapeMarkup(const wxString& text)
 246 {
 247     wxString ret;
 248
 249     for (wxString::const_iterator source = text.begin();
 250          source != text.end(); ++source)
 251     {
 252         bool isEntity = false;
 253
 254         // search in the list of the entities and eventually escape this character
 255         for (size_t j=0; j < wxMARKUP_ENTITY_MAX; j++)
 256         {
 257             if (*source == *wxMarkupEntities[wxMARKUP_ELEMENT_VALUE][j])
 258             {
 259                 ret << wxMarkupEntities[wxMARKUP_ELEMENT_NAME][j];
 260                 isEntity = true;
 261                 break;
 262             }
 263         }
 264
 265         if (!isEntity)
 266             ret << *source;     // this character does not need to be escaped
 267     }
 268
 269     return ret;
 270 }
 271
 272
 273
 274 // ----------------------------------------------------------------------------
 275 // wxStaticTextBase - generic implementation for wxST_ELLIPSIZE_* support
 276 // ----------------------------------------------------------------------------
 277
 278 void wxStaticTextBase::UpdateLabel()
 279 {
 280     if (!IsEllipsized())
 281         return;
 282
 283     wxString newlabel = GetEllipsizedLabelWithoutMarkup();
 284
 285     // we need to touch the "real" label (i.e. the text set inside the control,
 286     // using port-specific functions) instead of the string returned by GetLabel().
 287     //
 288     // In fact, we must be careful not to touch the original label passed to
 289     // SetLabel() otherwise GetLabel() will behave in a strange way to the user
 290     // (e.g. returning a "Ver...ing" instead of "Very long string") !
 291     if (newlabel == DoGetLabel())
 292         return;
 293     DoSetLabel(newlabel);
 294 }
 295
 296 wxString wxStaticTextBase::GetEllipsizedLabelWithoutMarkup() const
 297 {
 298     // this function should be used only by ports which do not support
 299     // ellipsis in static texts: we first remove markup (which cannot
 300     // be handled safely by Ellipsize()) and then ellipsize the result.
 301
 302     wxString ret(m_labelOrig);
 303
 304     // the order of the following two blocks is important!
 305
 306     if (HasFlag(wxST_MARKUP))
 307         ret = RemoveMarkup(ret);
 308
 309     if (IsEllipsized())
 310         ret = Ellipsize(ret);
 311
 312     return ret;
 313 }
 314
 315 #define wxELLIPSE_REPLACEMENT       wxT("...")
 316
 317 wxString wxStaticTextBase::Ellipsize(const wxString& label) const
 318 {
 319     wxSize sz(GetSize());
 320     if (sz.GetWidth() < 2 || sz.GetHeight() < 2)
 321     {
 322         // the size of this window is not valid (yet)
 323         return label;
 324     }
 325
 326     wxClientDC dc(wx_const_cast(wxStaticTextBase*, this));
 327     dc.SetFont(GetFont());
 328
 329     wxArrayInt charOffsets;
 330     wxString ret;
 331
 332     // these cannot be cached as they can change because of e.g. a font change
 333     int replacementWidth = dc.GetTextExtent(wxELLIPSE_REPLACEMENT).GetWidth();
 334     int marginWidth = dc.GetCharWidth()*2;
 335
 336     // handle correctly labels with newlines
 337     wxString curLine;
 338     wxSize reqsize;
 339     size_t len;
 340     for ( wxString::const_iterator pc = label.begin(); ; ++pc )
 341     {
 342         if ( pc == label.end() || *pc == _T('\n') )
 343         {
 344             len = curLine.length();
 345             if (len > 0 &&
 346                 dc.GetPartialTextExtents(curLine, charOffsets))
 347             {
 348                 wxASSERT(charOffsets.GetCount() == len);
 349
 350                 size_t totalWidth = charOffsets.Last();
 351                 if ( totalWidth > (size_t)sz.GetWidth() )
 352                 {
 353                     // we need to ellipsize this row
 354                     int excessPixels = totalWidth - sz.GetWidth() +
 355                                        replacementWidth +
 356                                        marginWidth;     // security margin (NEEDED!)
 357
 358                     // remove characters in excess
 359                     size_t initialChar,     // index of first char to erase
 360                            nChars;          // how many chars do we need to erase?
 361                     if (HasFlag(wxST_ELLIPSIZE_START))
 362                     {
 363                         initialChar = 0;
 364                         for (nChars=0;
 365                              nChars < len && charOffsets[nChars] < excessPixels;
 366                              nChars++)
 367                             ;
 368                     }
 369                     else if (HasFlag(wxST_ELLIPSIZE_MIDDLE))
 370                     {
 371                         // the start & end of the removed span of chars
 372                         initialChar = len/2;
 373                         size_t endChar = len/2;
 374
 375                         int removed = 0;
 376                         for ( ; removed < excessPixels; )
 377                         {
 378                             if (initialChar > 0)
 379                             {
 380                                 // width of the initialChar-th character
 381                                 int width = charOffsets[initialChar] -
 382                                             charOffsets[initialChar-1];
 383
 384                                 // remove the initialChar-th character
 385                                 removed += width;
 386                                 initialChar--;
 387                             }
 388
 389                             if (endChar < len - 1 &&
 390                                 removed < excessPixels)
 391                             {
 392                                 // width of the (endChar+1)-th character
 393                                 int width = charOffsets[endChar+1] -
 394                                             charOffsets[endChar];
 395
 396                                 // remove the endChar-th character
 397                                 removed += width;
 398                                 endChar++;
 399                             }
 400
 401                             if (initialChar == 0 && endChar == len-1)
 402                             {
 403                                 nChars = len+1;
 404                                 break;
 405                             }
 406                         }
 407
 408                         initialChar++;
 409                         nChars = endChar - initialChar + 1;
 410                     }
 411                     else
 412                     {
 413                         wxASSERT(HasFlag(wxST_ELLIPSIZE_END));
 414                         wxASSERT(len > 0);
 415
 416                         int maxWidth = totalWidth - excessPixels;
 417                         for (initialChar=0;
 418                              initialChar < len &&
 419                              charOffsets[initialChar] < maxWidth;
 420                              initialChar++)
 421                             ;
 422
 423                         if (initialChar == 0)
 424                         {
 425                             nChars = len;
 426                         }
 427                         else
 428                         {
 429                             initialChar--;      // go back one character
 430                             nChars = len - initialChar;
 431                         }
 432                     }
 433
 434                     if (nChars > len)
 435                     {
 436                         // need to remove the entire row!
 437                         curLine.clear();
 438                     }
 439                     else
 440                     {
 441                         // erase nChars characters after initialChar (included):
 442                         curLine.erase(initialChar, nChars+1);
 443
 444                         // if there is space for the replacement dots, add them
 445                         if (sz.GetWidth() > replacementWidth)
 446                             curLine.insert(initialChar, wxELLIPSE_REPLACEMENT);
 447                     }
 448
 449                     // if everything was ok, we should have shortened this line
 450                     // enough to make it fit in sz.GetWidth():
 451                     wxASSERT(dc.GetTextExtent(curLine).GetWidth() < sz.GetWidth());
 452                 }
 453             }
 454
 455             // add this (ellipsized) row to the rest of the label
 456             ret << curLine;
 457             if ( pc == label.end() )
 458             {
 459                 return ret;
 460             }
 461             else
 462             {
 463                 ret << *pc;
 464                 curLine.clear();
 465             }
 466         }
 467         // we need to remove mnemonics from the label for correct calculations
 468         else if ( *pc == _T('&') )
 469         {
 470             // pc+1 is safe: at worst we'll be at end()
 471             wxString::const_iterator next = pc + 1;
 472             if ( next != label.end() && *next == _T('&') )
 473                 curLine += _T('&');          // && becomes &
 474             //else: remove this ampersand
 475         }
 476         // we need also to expand tabs to properly calc their size
 477         else if ( *pc == _T('\t') )
 478         {
 479             // Windows natively expands the TABs to 6 spaces. Do the same:
 480             curLine += wxT("      ");
 481         }
 482         else
 483         {
 484             curLine += *pc;
 485         }
 486     }
 487
 488     //return ret;
 489 }
 490
 491 #endif // wxUSE_STATTEXT