samples/widgets/widgets.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Program:     wxWidgets Widgets Sample
   3 // Name:        widgets.cpp
   4 // Purpose:     Sample showing most of the simple wxWidgets widgets
   5 // Author:      Vadim Zeitlin
   6 // Created:     27.03.01
   7 // Id:          $Id$
   8 // Copyright:   (c) 2001 Vadim Zeitlin
   9 // License:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // for compilers that support precompilation, includes "wx/wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 // for all others, include the necessary headers
  28 #ifndef WX_PRECOMP
  29     #include "wx/app.h"
  30     #include "wx/log.h"
  31     #include "wx/frame.h"
  32     #include "wx/menu.h"
  33
  34     #include "wx/button.h"
  35     #include "wx/checkbox.h"
  36     #include "wx/listbox.h"
  37     #include "wx/statbox.h"
  38     #include "wx/stattext.h"
  39     #include "wx/textctrl.h"
  40 #endif
  41
  42 #include "wx/sysopt.h"
  43 #include "wx/bookctrl.h"
  44 #include "wx/sizer.h"
  45 #include "wx/colordlg.h"
  46 #include "wx/fontdlg.h"
  47 #include "wx/textdlg.h"
  48
  49 #include "widgets.h"
  50
  51 // ----------------------------------------------------------------------------
  52 // constants
  53 // ----------------------------------------------------------------------------
  54
  55 // control ids
  56 enum
  57 {
  58     Widgets_ClearLog = 100,
  59     Widgets_Quit,
  60 #if wxUSE_TOOLTIPS
  61     Widgets_SetTooltip,
  62 #endif // wxUSE_TOOLTIPS
  63     Widgets_SetFgColour,
  64     Widgets_SetBgColour,
  65     Widgets_SetFont,
  66     Widgets_Enable
  67 };
  68
  69 // ----------------------------------------------------------------------------
  70 // our classes
  71 // ----------------------------------------------------------------------------
  72
  73 // Define a new application type, each program should derive a class from wxApp
  74 class WidgetsApp : public wxApp
  75 {
  76 public:
  77     // override base class virtuals
  78     // ----------------------------
  79
  80     // this one is called on application startup and is a good place for the app
  81     // initialization (doing it here and not in the ctor allows to have an error
  82     // return: if OnInit() returns false, the application terminates)
  83     virtual bool OnInit();
  84 };
  85
  86 // Define a new frame type: this is going to be our main frame
  87 class WidgetsFrame : public wxFrame
  88 {
  89 public:
  90     // ctor(s) and dtor
  91     WidgetsFrame(const wxString& title);
  92     virtual ~WidgetsFrame();
  93
  94 protected:
  95     // event handlers
  96 #if USE_LOG
  97     void OnButtonClearLog(wxCommandEvent& event);
  98 #endif // USE_LOG
  99     void OnExit(wxCommandEvent& event);
 100
 101 #if wxUSE_MENUS
 102 #if wxUSE_TOOLTIPS
 103     void OnSetTooltip(wxCommandEvent& event);
 104 #endif // wxUSE_TOOLTIPS
 105     void OnSetFgCol(wxCommandEvent& event);
 106     void OnSetBgCol(wxCommandEvent& event);
 107     void OnSetFont(wxCommandEvent& event);
 108     void OnEnable(wxCommandEvent& event);
 109 #endif // wxUSE_MENUS
 110
 111     // initialize the book: add all pages to it
 112     void InitBook();
 113
 114 private:
 115     // the panel containing everything
 116     wxPanel *m_panel;
 117
 118 #if USE_LOG
 119     // the listbox for logging messages
 120     wxListBox *m_lboxLog;
 121
 122     // the log target we use to redirect messages to the listbox
 123     wxLog *m_logTarget;
 124 #endif // USE_LOG
 125
 126     // the book containing the test pages
 127     wxBookCtrl *m_book;
 128
 129     // and the image list for it
 130     wxImageList *m_imaglist;
 131
 132 #if wxUSE_MENUS
 133     // last chosen fg/bg colours and font
 134     wxColour m_colFg,
 135              m_colBg;
 136     wxFont   m_font;
 137 #endif // wxUSE_MENUS
 138
 139     // any class wishing to process wxWidgets events must use this macro
 140     DECLARE_EVENT_TABLE()
 141 };
 142
 143 #if USE_LOG
 144 // A log target which just redirects the messages to a listbox
 145 class LboxLogger : public wxLog
 146 {
 147 public:
 148     LboxLogger(wxListBox *lbox, wxLog *logOld)
 149     {
 150         m_lbox = lbox;
 151         //m_lbox->Disable(); -- looks ugly under MSW
 152         m_logOld = logOld;
 153     }
 154
 155     virtual ~LboxLogger()
 156     {
 157         wxLog::SetActiveTarget(m_logOld);
 158     }
 159
 160 private:
 161     // implement sink functions
 162     virtual void DoLog(wxLogLevel level, const wxChar *szString, time_t t)
 163     {
 164         // don't put trace messages into listbox or we can get into infinite
 165         // recursion
 166         if ( level == wxLOG_Trace )
 167         {
 168             if ( m_logOld )
 169             {
 170                 // cast is needed to call protected method
 171                 ((LboxLogger *)m_logOld)->DoLog(level, szString, t);
 172             }
 173         }
 174         else
 175         {
 176             wxLog::DoLog(level, szString, t);
 177         }
 178     }
 179
 180     virtual void DoLogString(const wxChar *szString, time_t WXUNUSED(t))
 181     {
 182         wxString msg;
 183         TimeStamp(&msg);
 184         msg += szString;
 185
 186         #ifdef __WXUNIVERSAL__
 187             m_lbox->AppendAndEnsureVisible(msg);
 188         #else // other ports don't have this method yet
 189             m_lbox->Append(msg);
 190             m_lbox->SetFirstItem(m_lbox->GetCount() - 1);
 191         #endif
 192     }
 193
 194     // the control we use
 195     wxListBox *m_lbox;
 196
 197     // the old log target
 198     wxLog *m_logOld;
 199 };
 200 #endif // USE_LOG
 201
 202 // array of pages
 203 WX_DEFINE_ARRAY_PTR(WidgetsPage *, ArrayWidgetsPage);
 204
 205 // ----------------------------------------------------------------------------
 206 // misc macros
 207 // ----------------------------------------------------------------------------
 208
 209 IMPLEMENT_APP(WidgetsApp)
 210
 211 // ----------------------------------------------------------------------------
 212 // event tables
 213 // ----------------------------------------------------------------------------
 214
 215 BEGIN_EVENT_TABLE(WidgetsFrame, wxFrame)
 216 #if USE_LOG
 217     EVT_BUTTON(Widgets_ClearLog, WidgetsFrame::OnButtonClearLog)
 218 #endif // USE_LOG
 219     EVT_BUTTON(Widgets_Quit, WidgetsFrame::OnExit)
 220
 221 #if wxUSE_TOOLTIPS
 222     EVT_MENU(Widgets_SetTooltip, WidgetsFrame::OnSetTooltip)
 223 #endif // wxUSE_TOOLTIPS
 224
 225     EVT_MENU(Widgets_SetFgColour, WidgetsFrame::OnSetFgCol)
 226     EVT_MENU(Widgets_SetBgColour, WidgetsFrame::OnSetBgCol)
 227     EVT_MENU(Widgets_SetFont,     WidgetsFrame::OnSetFont)
 228     EVT_MENU(Widgets_Enable,      WidgetsFrame::OnEnable)
 229
 230     EVT_MENU(wxID_EXIT, WidgetsFrame::OnExit)
 231 END_EVENT_TABLE()
 232
 233 // ============================================================================
 234 // implementation
 235 // ============================================================================
 236
 237 // ----------------------------------------------------------------------------
 238 // app class
 239 // ----------------------------------------------------------------------------
 240
 241 bool WidgetsApp::OnInit()
 242 {
 243     if ( !wxApp::OnInit() )
 244         return false;
 245
 246     // the reason for having these ifdef's is that I often run two copies of
 247     // this sample side by side and it is useful to see which one is which
 248     wxString title;
 249 #if defined(__WXUNIVERSAL__)
 250     title = _T("wxUniv/");
 251 #endif
 252
 253 #if defined(__WXMSW__)
 254     title += _T("wxMSW");
 255 #elif defined(__WXGTK__)
 256     title += _T("wxGTK");
 257 #elif defined(__WXMAC__)
 258     title += _T("wxMAC");
 259 #elif defined(__WXMOTIF__)
 260     title += _T("wxMOTIF");
 261 #else
 262     title += _T("wxWidgets");
 263 #endif
 264
 265     wxFrame *frame = new WidgetsFrame(title + _T(" widgets demo"));
 266     frame->Show();
 267
 268     //wxLog::AddTraceMask(_T("listbox"));
 269     //wxLog::AddTraceMask(_T("scrollbar"));
 270     //wxLog::AddTraceMask(_T("focus"));
 271
 272     return true;
 273 }
 274
 275 // ----------------------------------------------------------------------------
 276 // WidgetsFrame construction
 277 // ----------------------------------------------------------------------------
 278
 279 WidgetsFrame::WidgetsFrame(const wxString& title)
 280             : wxFrame(NULL, wxID_ANY, title,
 281                       wxPoint(0, 50), wxDefaultSize,
 282                       wxDEFAULT_FRAME_STYLE |
 283                       wxNO_FULL_REPAINT_ON_RESIZE |
 284                       wxCLIP_CHILDREN |
 285                       wxTAB_TRAVERSAL)
 286 {
 287     // init everything
 288 #if USE_LOG
 289     m_lboxLog = (wxListBox *)NULL;
 290     m_logTarget = (wxLog *)NULL;
 291 #endif // USE_LOG
 292     m_book = (wxBookCtrl *)NULL;
 293     m_imaglist = (wxImageList *)NULL;
 294
 295 #if wxUSE_MENUS
 296     // create the menubar
 297     wxMenuBar *mbar = new wxMenuBar;
 298     wxMenu *menuWidget = new wxMenu;
 299 #if wxUSE_TOOLTIPS
 300     menuWidget->Append(Widgets_SetTooltip, _T("Set &tooltip...\tCtrl-T"));
 301     menuWidget->AppendSeparator();
 302 #endif // wxUSE_TOOLTIPS
 303     menuWidget->Append(Widgets_SetFgColour, _T("Set &foreground...\tCtrl-F"));
 304     menuWidget->Append(Widgets_SetBgColour, _T("Set &background...\tCtrl-B"));
 305     menuWidget->Append(Widgets_SetFont,     _T("Set f&ont...\tCtrl-O"));
 306     menuWidget->AppendCheckItem(Widgets_Enable,  _T("&Enable/disable\tCtrl-E"));
 307     menuWidget->AppendSeparator();
 308     menuWidget->Append(wxID_EXIT, _T("&Quit\tCtrl-Q"));
 309     mbar->Append(menuWidget, _T("&Widget"));
 310     SetMenuBar(mbar);
 311
 312     mbar->Check(Widgets_Enable, true);
 313 #endif // wxUSE_MENUS
 314
 315     // create controls
 316     m_panel = new wxPanel(this, wxID_ANY,
 317         wxDefaultPosition, wxDefaultSize, wxCLIP_CHILDREN);
 318
 319     wxSizer *sizerTop = new wxBoxSizer(wxVERTICAL);
 320
 321     // we have 2 panes: book with pages demonstrating the controls in the
 322     // upper one and the log window with some buttons in the lower
 323
 324     int style = wxNO_FULL_REPAINT_ON_RESIZE|wxCLIP_CHILDREN|wxBC_DEFAULT;
 325     // Uncomment to suppress page theme (draw in solid colour)
 326     //style |= wxNB_NOPAGETHEME;
 327
 328     m_book = new wxBookCtrl(m_panel, wxID_ANY, wxDefaultPosition,
 329         wxDefaultSize, style);
 330     InitBook();
 331
 332 #ifndef __SMARTPHONE__
 333     // the lower one only has the log listbox and a button to clear it
 334 #if USE_LOG
 335     wxSizer *sizerDown = new wxStaticBoxSizer(
 336         new wxStaticBox( m_panel, wxID_ANY, _T("&Log window") ),
 337         wxVERTICAL);
 338
 339     m_lboxLog = new wxListBox(m_panel, wxID_ANY);
 340     sizerDown->Add(m_lboxLog, 1, wxGROW | wxALL, 5);
 341     sizerDown->SetMinSize(100, 150);
 342 #else
 343     wxSizer *sizerDown = new wxBoxSizer(wxVERTICAL);
 344 #endif // USE_LOG
 345
 346     wxBoxSizer *sizerBtns = new wxBoxSizer(wxHORIZONTAL);
 347     wxButton *btn;
 348 #if USE_LOG
 349     btn = new wxButton(m_panel, Widgets_ClearLog, _T("Clear &log"));
 350     sizerBtns->Add(btn);
 351     sizerBtns->Add(10, 0); // spacer
 352 #endif // USE_LOG
 353     btn = new wxButton(m_panel, Widgets_Quit, _T("E&xit"));
 354     sizerBtns->Add(btn);
 355     sizerDown->Add(sizerBtns, 0, wxALL | wxALIGN_RIGHT, 5);
 356
 357     // put everything together
 358     sizerTop->Add(m_book, 1, wxGROW | (wxALL & ~(wxTOP | wxBOTTOM)), 10);
 359     sizerTop->Add(0, 5, 0, wxGROW); // spacer in between
 360     sizerTop->Add(sizerDown, 0,  wxGROW | (wxALL & ~wxTOP), 10);
 361
 362 #else // !__SMARTPHONE__/__SMARTPHONE__
 363
 364     sizerTop->Add(m_book, 1, wxGROW | wxALL );
 365
 366 #endif // __SMARTPHONE__
 367
 368     m_panel->SetSizer(sizerTop);
 369
 370     sizerTop->Fit(this);
 371     sizerTop->SetSizeHints(this);
 372
 373 #if USE_LOG && !defined(__WXCOCOA__)
 374     // wxCocoa's listbox is too flakey to use for logging right now
 375     // now that everything is created we can redirect the log messages to the
 376     // listbox
 377     m_logTarget = new LboxLogger(m_lboxLog, wxLog::GetActiveTarget());
 378     wxLog::SetActiveTarget(m_logTarget);
 379 #endif
 380 }
 381
 382 void WidgetsFrame::InitBook()
 383 {
 384     m_imaglist = new wxImageList(32, 32);
 385
 386     ArrayWidgetsPage pages;
 387     wxArrayString labels;
 388
 389     // we need to first create all pages and only then add them to the book
 390     // as we need the image list first
 391     WidgetsPageInfo *info = WidgetsPage::ms_widgetPages;
 392     while ( info )
 393     {
 394         WidgetsPage *page = (*info->GetCtor())(m_book, m_imaglist);
 395         pages.Add(page);
 396
 397         labels.Add(info->GetLabel());
 398
 399         info = info->GetNext();
 400     }
 401
 402     m_book->SetImageList(m_imaglist);
 403
 404     // now do add them
 405     size_t count = pages.GetCount();
 406     for ( size_t n = 0; n < count; n++ )
 407     {
 408         m_book->AddPage(
 409                         pages[n],
 410                         labels[n],
 411                         false, // don't select
 412                         n // image id
 413                        );
 414
 415 /*
 416         wxColour colour = m_book->MSWGetBgColourForChild(pages[n]);
 417         pages[n]->SetBackgroundColour(colour);
 418 */
 419     }
 420 }
 421
 422 WidgetsFrame::~WidgetsFrame()
 423 {
 424 #if USE_LOG
 425     delete m_logTarget;
 426 #endif // USE_LOG
 427     delete m_imaglist;
 428 }
 429
 430 // ----------------------------------------------------------------------------
 431 // WidgetsFrame event handlers
 432 // ----------------------------------------------------------------------------
 433
 434 void WidgetsFrame::OnExit(wxCommandEvent& WXUNUSED(event))
 435 {
 436     Close();
 437 }
 438
 439 #if USE_LOG
 440 void WidgetsFrame::OnButtonClearLog(wxCommandEvent& WXUNUSED(event))
 441 {
 442     m_lboxLog->Clear();
 443 }
 444 #endif // USE_LOG
 445
 446 #if wxUSE_MENUS
 447
 448 #if wxUSE_TOOLTIPS
 449
 450 void WidgetsFrame::OnSetTooltip(wxCommandEvent& WXUNUSED(event))
 451 {
 452     static wxString s_tip = _T("This is a tooltip");
 453
 454     wxString s = wxGetTextFromUser
 455                  (
 456                     _T("Tooltip text: "),
 457                     _T("Widgets sample"),
 458                     s_tip,
 459                     this
 460                  );
 461
 462     if ( s.empty() )
 463         return;
 464
 465     WidgetsPage *page = wxStaticCast(m_book->GetCurrentPage(), WidgetsPage);
 466     page->GetWidget()->SetToolTip(s_tip = s);
 467
 468     wxControl *ctrl2 = page->GetWidget2();
 469     if ( ctrl2 )
 470         ctrl2->SetToolTip(s);
 471 }
 472
 473 #endif // wxUSE_TOOLTIPS
 474
 475 void WidgetsFrame::OnSetFgCol(wxCommandEvent& WXUNUSED(event))
 476 {
 477 #if wxUSE_COLOURDLG
 478     // allow for debugging the default colour the first time this is called
 479     WidgetsPage *page = wxStaticCast(m_book->GetCurrentPage(), WidgetsPage);
 480     if (!m_colFg.Ok())
 481         m_colFg = page->GetForegroundColour();
 482
 483     wxColour col = wxGetColourFromUser(this, m_colFg);
 484     if ( !col.Ok() )
 485         return;
 486
 487     m_colFg = col;
 488
 489     page->GetWidget()->SetForegroundColour(m_colFg);
 490     page->GetWidget()->Refresh();
 491
 492     wxControl *ctrl2 = page->GetWidget2();
 493     if ( ctrl2 )
 494     {
 495         ctrl2->SetForegroundColour(m_colFg);
 496         ctrl2->Refresh();
 497     }
 498 #else
 499     wxLogMessage(_T("Colour selection dialog not available in current build."));
 500 #endif
 501 }
 502
 503 void WidgetsFrame::OnSetBgCol(wxCommandEvent& WXUNUSED(event))
 504 {
 505 #if wxUSE_COLOURDLG
 506     WidgetsPage *page = wxStaticCast(m_book->GetCurrentPage(), WidgetsPage);
 507     if ( !m_colBg.Ok() )
 508         m_colBg = page->GetBackgroundColour();
 509
 510     wxColour col = wxGetColourFromUser(this, m_colBg);
 511     if ( !col.Ok() )
 512         return;
 513
 514     m_colBg = col;
 515
 516     page->GetWidget()->SetBackgroundColour(m_colBg);
 517     page->GetWidget()->Refresh();
 518
 519     wxControl *ctrl2 = page->GetWidget2();
 520     if ( ctrl2 )
 521     {
 522         ctrl2->SetBackgroundColour(m_colFg);
 523         ctrl2->Refresh();
 524     }
 525 #else
 526     wxLogMessage(_T("Colour selection dialog not available in current build."));
 527 #endif
 528 }
 529
 530 void WidgetsFrame::OnSetFont(wxCommandEvent& WXUNUSED(event))
 531 {
 532 #if wxUSE_FONTDLG
 533     WidgetsPage *page = wxStaticCast(m_book->GetCurrentPage(), WidgetsPage);
 534     if (!m_font.Ok())
 535         m_font = page->GetFont();
 536
 537     wxFont font = wxGetFontFromUser(this, m_font);
 538     if ( !font.Ok() )
 539         return;
 540
 541     m_font = font;
 542
 543     page->GetWidget()->SetFont(m_font);
 544     page->GetWidget()->Refresh();
 545
 546     wxControl *ctrl2 = page->GetWidget2();
 547     if ( ctrl2 )
 548     {
 549         ctrl2->SetFont(m_font);
 550         ctrl2->Refresh();
 551     }
 552 #else
 553     wxLogMessage(_T("Font selection dialog not available in current build."));
 554 #endif
 555 }
 556
 557 void WidgetsFrame::OnEnable(wxCommandEvent& event)
 558 {
 559     WidgetsPage *page = wxStaticCast(m_book->GetCurrentPage(), WidgetsPage);
 560     page->GetWidget()->Enable(event.IsChecked());
 561 }
 562
 563 #endif // wxUSE_MENUS
 564
 565 // ----------------------------------------------------------------------------
 566 // WidgetsPageInfo
 567 // ----------------------------------------------------------------------------
 568
 569 WidgetsPageInfo *WidgetsPage::ms_widgetPages = NULL;
 570
 571 WidgetsPageInfo::WidgetsPageInfo(Constructor ctor, const wxChar *label)
 572                : m_label(label)
 573 {
 574     m_ctor = ctor;
 575
 576     m_next = NULL;
 577
 578     // dummy sorting: add and immediately sort on list according to label
 579
 580     if(WidgetsPage::ms_widgetPages)
 581     {
 582         WidgetsPageInfo *node_prev = WidgetsPage::ms_widgetPages;
 583         if(wxStrcmp(label,node_prev->GetLabel().c_str())<0)
 584         {
 585             // add as first
 586             m_next = node_prev;
 587             WidgetsPage::ms_widgetPages = this;
 588         }
 589         else
 590         {
 591             WidgetsPageInfo *node_next;
 592             do
 593             {
 594                 node_next = node_prev->GetNext();
 595                 if(node_next)
 596                 {
 597                     // add if between two
 598                     if(wxStrcmp(label,node_next->GetLabel().c_str())<0)
 599                     {
 600                         node_prev->SetNext(this);
 601                         m_next = node_next;
 602                         // force to break loop
 603                         node_next = NULL;
 604                     }
 605                 }
 606                 else
 607                 {
 608                     // add as last
 609                     node_prev->SetNext(this);
 610                     m_next = node_next;
 611                 }
 612                 node_prev = node_next;
 613             }while(node_next);
 614         }
 615     }
 616     else
 617     {
 618         // add when first
 619
 620         WidgetsPage::ms_widgetPages = this;
 621
 622     }
 623
 624 }
 625
 626 // ----------------------------------------------------------------------------
 627 // WidgetsPage
 628 // ----------------------------------------------------------------------------
 629
 630 WidgetsPage::WidgetsPage(wxBookCtrl *book)
 631            : wxPanel(book, wxID_ANY,
 632                      wxDefaultPosition, wxDefaultSize,
 633                      wxNO_FULL_REPAINT_ON_RESIZE |
 634                      wxCLIP_CHILDREN |
 635                      wxTAB_TRAVERSAL)
 636 {
 637 }
 638
 639 wxSizer *WidgetsPage::CreateSizerWithText(wxControl *control,
 640                                           wxWindowID id,
 641                                           wxTextCtrl **ppText)
 642 {
 643     wxSizer *sizerRow = new wxBoxSizer(wxHORIZONTAL);
 644     wxTextCtrl *text = new wxTextCtrl(this, id, wxEmptyString,
 645         wxDefaultPosition, wxDefaultSize, wxTE_PROCESS_ENTER);
 646
 647     sizerRow->Add(control, 0, wxRIGHT | wxALIGN_CENTRE_VERTICAL, 5);
 648     sizerRow->Add(text, 1, wxLEFT | wxALIGN_CENTRE_VERTICAL, 5);
 649
 650     if ( ppText )
 651         *ppText = text;
 652
 653     return sizerRow;
 654 }
 655
 656 // create a sizer containing a label and a text ctrl
 657 wxSizer *WidgetsPage::CreateSizerWithTextAndLabel(const wxString& label,
 658                                                   wxWindowID id,
 659                                                   wxTextCtrl **ppText)
 660 {
 661     return CreateSizerWithText(new wxStaticText(this, wxID_ANY, label),
 662         id, ppText);
 663 }
 664
 665 // create a sizer containing a button and a text ctrl
 666 wxSizer *WidgetsPage::CreateSizerWithTextAndButton(wxWindowID idBtn,
 667                                                    const wxString& label,
 668                                                    wxWindowID id,
 669                                                    wxTextCtrl **ppText)
 670 {
 671     return CreateSizerWithText(new wxButton(this, idBtn, label), id, ppText);
 672 }
 673
 674 wxCheckBox *WidgetsPage::CreateCheckBoxAndAddToSizer(wxSizer *sizer,
 675                                                      const wxString& label,
 676                                                      wxWindowID id)
 677 {
 678     wxCheckBox *checkbox = new wxCheckBox(this, id, label);
 679     sizer->Add(checkbox, 0, wxLEFT | wxRIGHT, 5);
 680     sizer->Add(0, 2, 0, wxGROW); // spacer
 681
 682     return checkbox;
 683 }
 684