src/common/ctrlcmn.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/ctrlcmn.cpp
   3 // Purpose:     wxControl common interface
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     26.07.99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) wxWidgets team
   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 #if wxUSE_CONTROLS
  28
  29 #include "wx/control.h"
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/dc.h"
  33     #include "wx/log.h"
  34     #include "wx/radiobut.h"
  35     #include "wx/statbmp.h"
  36     #include "wx/bitmap.h"
  37     #include "wx/utils.h"       // for wxStripMenuCodes()
  38     #include "wx/settings.h"
  39 #endif
  40
  41 const char wxControlNameStr[] = "control";
  42
  43 // ============================================================================
  44 // implementation
  45 // ============================================================================
  46
  47 wxControlBase::~wxControlBase()
  48 {
  49     // this destructor is required for Darwin
  50 }
  51
  52 bool wxControlBase::Create(wxWindow *parent,
  53                            wxWindowID id,
  54                            const wxPoint &pos,
  55                            const wxSize &size,
  56                            long style,
  57                            const wxValidator& wxVALIDATOR_PARAM(validator),
  58                            const wxString &name)
  59 {
  60     bool ret = wxWindow::Create(parent, id, pos, size, style, name);
  61
  62 #if wxUSE_VALIDATORS
  63     if ( ret )
  64         SetValidator(validator);
  65 #endif // wxUSE_VALIDATORS
  66
  67     return ret;
  68 }
  69
  70 bool wxControlBase::CreateControl(wxWindowBase *parent,
  71                                   wxWindowID id,
  72                                   const wxPoint& pos,
  73                                   const wxSize& size,
  74                                   long style,
  75                                   const wxValidator& validator,
  76                                   const wxString& name)
  77 {
  78     // even if it's possible to create controls without parents in some port,
  79     // it should surely be discouraged because it doesn't work at all under
  80     // Windows
  81     wxCHECK_MSG( parent, false, wxT("all controls must have parents") );
  82
  83     if ( !CreateBase(parent, id, pos, size, style, validator, name) )
  84         return false;
  85
  86     parent->AddChild(this);
  87
  88     return true;
  89 }
  90
  91 void wxControlBase::Command(wxCommandEvent& event)
  92 {
  93     (void)GetEventHandler()->ProcessEvent(event);
  94 }
  95
  96 void wxControlBase::InitCommandEvent(wxCommandEvent& event) const
  97 {
  98     event.SetEventObject(const_cast<wxControlBase *>(this));
  99
 100     // event.SetId(GetId()); -- this is usuall done in the event ctor
 101
 102     switch ( m_clientDataType )
 103     {
 104         case wxClientData_Void:
 105             event.SetClientData(GetClientData());
 106             break;
 107
 108         case wxClientData_Object:
 109             event.SetClientObject(GetClientObject());
 110             break;
 111
 112         case wxClientData_None:
 113             // nothing to do
 114             ;
 115     }
 116 }
 117
 118 bool wxControlBase::SetFont(const wxFont& font)
 119 {
 120     InvalidateBestSize();
 121     return wxWindow::SetFont(font);
 122 }
 123
 124 // wxControl-specific processing after processing the update event
 125 void wxControlBase::DoUpdateWindowUI(wxUpdateUIEvent& event)
 126 {
 127     // call inherited
 128     wxWindowBase::DoUpdateWindowUI(event);
 129
 130     // update label
 131     if ( event.GetSetText() )
 132     {
 133         if ( event.GetText() != GetLabel() )
 134             SetLabel(event.GetText());
 135     }
 136
 137     // Unfortunately we don't yet have common base class for
 138     // wxRadioButton, so we handle updates of radiobuttons here.
 139     // TODO: If once wxRadioButtonBase will exist, move this code there.
 140 #if wxUSE_RADIOBTN
 141     if ( event.GetSetChecked() )
 142     {
 143         wxRadioButton *radiobtn = wxDynamicCastThis(wxRadioButton);
 144         if ( radiobtn )
 145             radiobtn->SetValue(event.GetChecked());
 146     }
 147 #endif // wxUSE_RADIOBTN
 148 }
 149
 150 /* static */
 151 wxString wxControlBase::GetLabelText(const wxString& label)
 152 {
 153     // we don't want strip the TABs here, just the mnemonics
 154     return wxStripMenuCodes(label, wxStrip_Mnemonics);
 155 }
 156
 157 /* static */
 158 wxString wxControlBase::RemoveMnemonics(const wxString& str)
 159 {
 160     // we don't want strip the TABs here, just the mnemonics
 161     return wxStripMenuCodes(str, wxStrip_Mnemonics);
 162 }
 163
 164 /* static */
 165 wxString wxControlBase::EscapeMnemonics(const wxString& text)
 166 {
 167     wxString label(text);
 168     label.Replace("&", "&&");
 169     return label;
 170 }
 171
 172 /* static */
 173 int wxControlBase::FindAccelIndex(const wxString& label, wxString *labelOnly)
 174 {
 175     // the character following MNEMONIC_PREFIX is the accelerator for this
 176     // control unless it is MNEMONIC_PREFIX too - this allows to insert
 177     // literal MNEMONIC_PREFIX chars into the label
 178     static const wxChar MNEMONIC_PREFIX = wxT('&');
 179
 180     if ( labelOnly )
 181     {
 182         labelOnly->Empty();
 183         labelOnly->Alloc(label.length());
 184     }
 185
 186     int indexAccel = -1;
 187     for ( wxString::const_iterator pc = label.begin(); pc != label.end(); ++pc )
 188     {
 189         if ( *pc == MNEMONIC_PREFIX )
 190         {
 191             ++pc; // skip it
 192             if ( pc == label.end() )
 193                 break;
 194             else if ( *pc != MNEMONIC_PREFIX )
 195             {
 196                 if ( indexAccel == -1 )
 197                 {
 198                     // remember it (-1 is for MNEMONIC_PREFIX itself
 199                     indexAccel = pc - label.begin() - 1;
 200                 }
 201                 else
 202                 {
 203                     wxFAIL_MSG(wxT("duplicate accel char in control label"));
 204                 }
 205             }
 206         }
 207
 208         if ( labelOnly )
 209         {
 210             *labelOnly += *pc;
 211         }
 212     }
 213
 214     return indexAccel;
 215 }
 216
 217 wxBorder wxControlBase::GetDefaultBorder() const
 218 {
 219     return wxBORDER_THEME;
 220 }
 221
 222 /* static */ wxVisualAttributes
 223 wxControlBase::GetCompositeControlsDefaultAttributes(wxWindowVariant WXUNUSED(variant))
 224 {
 225     wxVisualAttributes attrs;
 226     attrs.font = wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT);
 227     attrs.colFg = wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOWTEXT);
 228     attrs.colBg = wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW);
 229
 230     return attrs;
 231 }
 232
 233 // ----------------------------------------------------------------------------
 234 // wxControlBase - ellipsization code
 235 // ----------------------------------------------------------------------------
 236
 237 #define wxELLIPSE_REPLACEMENT       wxS("...")
 238
 239 /* static and protected */
 240 wxString wxControlBase::DoEllipsizeSingleLine(const wxString& curLine, const wxDC& dc,
 241                                               wxEllipsizeMode mode, int maxFinalWidthPx,
 242                                               int replacementWidthPx, int marginWidthPx)
 243 {
 244     wxASSERT_MSG(replacementWidthPx > 0 && marginWidthPx > 0,
 245                  "Invalid parameters");
 246     wxASSERT_LEVEL_2_MSG(!curLine.Contains('\n'),
 247                          "Use Ellipsize() instead!");
 248
 249     wxASSERT_MSG( mode != wxELLIPSIZE_NONE, "shouldn't be called at all then" );
 250
 251     // NOTE: this function assumes that any mnemonic/tab character has already
 252     //       been handled if it was necessary to handle them (see Ellipsize())
 253
 254     if (maxFinalWidthPx <= 0)
 255         return wxEmptyString;
 256
 257     wxArrayInt charOffsetsPx;
 258     size_t len = curLine.length();
 259     if (len == 0 ||
 260         !dc.GetPartialTextExtents(curLine, charOffsetsPx))
 261         return curLine;
 262
 263     wxASSERT(charOffsetsPx.GetCount() == len);
 264
 265     // NOTE: charOffsetsPx[n] is the width in pixels of the first n characters (with the last one INCLUDED)
 266     //       thus charOffsetsPx[len-1] is the total width of the string
 267     size_t totalWidthPx = charOffsetsPx.Last();
 268     if ( totalWidthPx <= (size_t)maxFinalWidthPx )
 269         return curLine;     // we don't need to do any ellipsization!
 270
 271     int excessPx = wxMin(totalWidthPx - maxFinalWidthPx +
 272                          replacementWidthPx +
 273                          marginWidthPx,     // security margin
 274                          totalWidthPx);
 275     wxASSERT(excessPx>0);       // excessPx should be in the [1;totalWidthPx] range
 276
 277     // REMEMBER: indexes inside the string have a valid range of [0;len-1] if not otherwise constrained
 278     //           lengths/counts of characters (e.g. nCharsToRemove) have a valid range of [0;len] if not otherwise constrained
 279     // NOTE: since this point we know we have for sure a non-empty string from which we need
 280     //       to remove _at least_ one character (thus nCharsToRemove below is constrained to be >= 1)
 281
 282     size_t initialCharToRemove,     // index of first character to erase, valid range is [0;len-1]
 283            nCharsToRemove;          // how many chars do we need to erase? valid range is [1;len-initialCharToRemove]
 284
 285     // let's compute the range of characters to remove depending on the ellipsization mode:
 286     switch (mode)
 287     {
 288         case wxELLIPSIZE_START:
 289             initialCharToRemove = 0;
 290             for ( nCharsToRemove = 1;
 291                   nCharsToRemove < len && charOffsetsPx[nCharsToRemove-1] < excessPx;
 292                   nCharsToRemove++ )
 293                 ;
 294             break;
 295
 296         case wxELLIPSIZE_MIDDLE:
 297             {
 298                 // NOTE: the following piece of code works also when len == 1
 299
 300                 // start the removal process from the middle of the string
 301                 // i.e. separe the string in three parts:
 302                 // - the first one to preserve, valid range [0;initialCharToRemove-1] or the empty range if initialCharToRemove==0
 303                 // - the second one to remove, valid range [initialCharToRemove;endCharToRemove]
 304                 // - the third one to preserve, valid range [endCharToRemove+1;len-1] or the empty range if endCharToRemove==len-1
 305                 // NOTE: empty range != range [0;0] since the range [0;0] contains 1 character (the zero-th one)!
 306                 initialCharToRemove = len/2;
 307                 size_t endCharToRemove = len/2;     // index of the last character to remove; valid range is [0;len-1]
 308
 309                 int removedPx = 0;
 310                 bool removeFromStart = true;
 311                 for ( ; removedPx < excessPx; )
 312                 {
 313                     const bool canRemoveFromStart = initialCharToRemove > 0;
 314                     const bool canRemoveFromEnd = endCharToRemove < len - 1;
 315
 316                     if ( !canRemoveFromStart && !canRemoveFromEnd )
 317                     {
 318                         // we need to remove all the characters of the string!
 319                         break;
 320                     }
 321
 322                     // Remove from the beginning in even steps and from the end
 323                     // in odd steps, unless we exhausted one side already:
 324                     removeFromStart = !removeFromStart;
 325                     if ( removeFromStart && !canRemoveFromStart )
 326                         removeFromStart = false;
 327                     else if ( !removeFromStart && !canRemoveFromEnd )
 328                         removeFromStart = true;
 329
 330                     if ( removeFromStart )
 331                     {
 332                         // try to remove the last character of the first part of the string
 333
 334                         // width of the (initialCharToRemove-1)-th character
 335                         int widthPx;
 336                         if (initialCharToRemove >= 2)
 337                             widthPx = charOffsetsPx[initialCharToRemove-1] - charOffsetsPx[initialCharToRemove-2];
 338                         else
 339                             widthPx = charOffsetsPx[initialCharToRemove-1];
 340                                 // the (initialCharToRemove-1)-th character is the first char of the string
 341
 342                         wxASSERT(widthPx >= 0);     // widthPx is zero for e.g. tab characters
 343
 344                         // mark the (initialCharToRemove-1)-th character as removable
 345                         initialCharToRemove--;
 346                         removedPx += widthPx;
 347
 348                         continue; // don't remove anything else
 349                     }
 350                     else // !removeFromStart
 351                     {
 352                         // try to remove the first character of the last part of the string
 353
 354                         // width of the (endCharToRemove+1)-th character
 355                         int widthPx = charOffsetsPx[endCharToRemove+1] -
 356                                       charOffsetsPx[endCharToRemove];
 357
 358                         wxASSERT(widthPx >= 0);     // widthPx is zero for e.g. tab characters
 359
 360                         // mark the (endCharToRemove+1)-th character as removable
 361                         endCharToRemove++;
 362                         removedPx += widthPx;
 363
 364                         continue; // don't remove anything else
 365                     }
 366                 }
 367
 368                 nCharsToRemove = endCharToRemove - initialCharToRemove + 1;
 369             }
 370             break;
 371
 372         case wxELLIPSIZE_END:
 373             {
 374                 int maxWidthPx = totalWidthPx - excessPx;
 375
 376                 // go backward from the end of the string toward the start
 377                 for ( initialCharToRemove = len-1;
 378                       initialCharToRemove > 0 && charOffsetsPx[initialCharToRemove-1] > maxWidthPx;
 379                       initialCharToRemove-- )
 380                     ;
 381                 nCharsToRemove = len - initialCharToRemove;
 382             }
 383             break;
 384
 385         case wxELLIPSIZE_NONE:
 386         default:
 387             wxFAIL_MSG("invalid ellipsize mode");
 388             return curLine;
 389     }
 390
 391     wxASSERT(initialCharToRemove <= len-1);  // see valid range for initialCharToRemove above
 392     wxASSERT(nCharsToRemove >= 1 && nCharsToRemove <= len-initialCharToRemove);  // see valid range for nCharsToRemove above
 393
 394     // erase nCharsToRemove characters after initialCharToRemove (included);
 395     // e.g. if we have the string "foobar" (len = 6)
 396     //                               ^
 397     //                               \--- initialCharToRemove = 2
 398     //      and nCharsToRemove = 2, then we get "foar"
 399     wxString ret(curLine);
 400     ret.erase(initialCharToRemove, nCharsToRemove);
 401
 402     int removedPx;
 403     if (initialCharToRemove >= 1)
 404         removedPx = charOffsetsPx[initialCharToRemove+nCharsToRemove-1] - charOffsetsPx[initialCharToRemove-1];
 405     else
 406         removedPx = charOffsetsPx[initialCharToRemove+nCharsToRemove-1];
 407     wxASSERT(removedPx >= excessPx);
 408
 409     // if there is space for the replacement dots, add them
 410     if ((int)totalWidthPx-removedPx+replacementWidthPx < maxFinalWidthPx)
 411         ret.insert(initialCharToRemove, wxELLIPSE_REPLACEMENT);
 412
 413     // if everything was ok, we should have shortened this line
 414     // enough to make it fit in maxFinalWidthPx:
 415     wxASSERT_LEVEL_2(dc.GetTextExtent(ret).GetWidth() <= maxFinalWidthPx);
 416
 417     return ret;
 418 }
 419
 420 /* static */
 421 wxString wxControlBase::Ellipsize(const wxString& label, const wxDC& dc,
 422                                   wxEllipsizeMode mode, int maxFinalWidth,
 423                                   int flags)
 424 {
 425     wxString ret;
 426
 427     // these cannot be cached between different Ellipsize() calls as they can
 428     // change because of e.g. a font change; however we calculate them only once
 429     // when ellipsizing multiline labels:
 430     int replacementWidth = dc.GetTextExtent(wxELLIPSE_REPLACEMENT).GetWidth();
 431     int marginWidth = dc.GetCharWidth();
 432
 433     // NB: we must handle correctly labels with newlines:
 434     wxString curLine;
 435     for ( wxString::const_iterator pc = label.begin(); ; ++pc )
 436     {
 437         if ( pc == label.end() || *pc == wxS('\n') )
 438         {
 439             curLine = DoEllipsizeSingleLine(curLine, dc, mode, maxFinalWidth,
 440                                             replacementWidth, marginWidth);
 441
 442             // add this (ellipsized) row to the rest of the label
 443             ret << curLine;
 444             if ( pc == label.end() )
 445             {
 446                 // NOTE: this is the return which always exits the function
 447                 return ret;
 448             }
 449             else
 450             {
 451                 ret << *pc;
 452                 curLine.clear();
 453             }
 454         }
 455         // we need to remove mnemonics from the label for correct calculations
 456         else if ( *pc == wxS('&') && (flags & wxELLIPSIZE_FLAGS_PROCESS_MNEMONICS) )
 457         {
 458             // pc+1 is safe: at worst we'll be at end()
 459             wxString::const_iterator next = pc + 1;
 460             if ( next != label.end() && *next == wxS('&') )
 461                 curLine += wxS('&');          // && becomes &
 462             //else: remove this ampersand
 463         }
 464         // we need also to expand tabs to properly calc their size
 465         else if ( *pc == wxS('\t') && (flags & wxELLIPSIZE_FLAGS_EXPAND_TABS) )
 466         {
 467             // Windows natively expands the TABs to 6 spaces. Do the same:
 468             curLine += wxS("      ");
 469         }
 470         else
 471         {
 472             curLine += *pc;
 473         }
 474     }
 475
 476     // this return would generate a
 477     //  warning C4702: unreachable code
 478     // with MSVC since the function always exits from inside the loop
 479     //return ret;
 480 }
 481
 482
 483
 484 // ----------------------------------------------------------------------------
 485 // wxStaticBitmap
 486 // ----------------------------------------------------------------------------
 487
 488 #if wxUSE_STATBMP
 489
 490 wxStaticBitmapBase::~wxStaticBitmapBase()
 491 {
 492     // this destructor is required for Darwin
 493 }
 494
 495 wxSize wxStaticBitmapBase::DoGetBestSize() const
 496 {
 497     wxSize best;
 498     wxBitmap bmp = GetBitmap();
 499     if ( bmp.Ok() )
 500         best = wxSize(bmp.GetWidth(), bmp.GetHeight());
 501     else
 502         // this is completely arbitrary
 503         best = wxSize(16, 16);
 504     CacheBestSize(best);
 505     return best;
 506 }
 507
 508 #endif // wxUSE_STATBMP
 509
 510 #endif // wxUSE_CONTROLS