src/generic/progdlgg.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/generic/progdlgg.cpp
   3 // Purpose:     wxProgressDialog class
   4 // Author:      Karsten Ballueder
   5 // Modified by:
   6 // Created:     09.05.1999
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Karsten Ballueder
   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_PROGRESSDLG
  28
  29 #ifndef WX_PRECOMP
  30     #include "wx/utils.h"
  31     #include "wx/frame.h"
  32     #include "wx/button.h"
  33     #include "wx/stattext.h"
  34     #include "wx/sizer.h"
  35     #include "wx/event.h"
  36     #include "wx/gauge.h"
  37     #include "wx/intl.h"
  38     #include "wx/dcclient.h"
  39     #include "wx/timer.h"
  40     #include "wx/settings.h"
  41     #include "wx/app.h"
  42 #endif
  43
  44 #include "wx/progdlg.h"
  45 #include "wx/evtloop.h"
  46
  47 // ---------------------------------------------------------------------------
  48 // macros
  49 // ---------------------------------------------------------------------------
  50
  51 /* Macro for avoiding #ifdefs when value have to be different depending on size of
  52    device we display on - take it from something like wxDesktopPolicy in the future
  53  */
  54
  55 #if defined(__SMARTPHONE__)
  56     #define wxLARGESMALL(large,small) small
  57 #else
  58     #define wxLARGESMALL(large,small) large
  59 #endif
  60
  61 // ----------------------------------------------------------------------------
  62 // constants
  63 // ----------------------------------------------------------------------------
  64
  65 #define LAYOUT_MARGIN wxLARGESMALL(8,2)
  66
  67 static const int wxID_SKIP = 32000;  // whatever
  68
  69 // ----------------------------------------------------------------------------
  70 // private functions
  71 // ----------------------------------------------------------------------------
  72
  73 // update the label to show the given time (in seconds)
  74 static void SetTimeLabel(unsigned long val, wxStaticText *label);
  75
  76 // ----------------------------------------------------------------------------
  77 // event tables
  78 // ----------------------------------------------------------------------------
  79
  80 BEGIN_EVENT_TABLE(wxProgressDialog, wxDialog)
  81     EVT_BUTTON(wxID_CANCEL, wxProgressDialog::OnCancel)
  82     EVT_BUTTON(wxID_SKIP, wxProgressDialog::OnSkip)
  83
  84     EVT_CLOSE(wxProgressDialog::OnClose)
  85 END_EVENT_TABLE()
  86
  87 IMPLEMENT_CLASS(wxProgressDialog, wxDialog)
  88
  89 // ============================================================================
  90 // wxProgressDialog implementation
  91 // ============================================================================
  92
  93 // ----------------------------------------------------------------------------
  94 // wxProgressDialog creation
  95 // ----------------------------------------------------------------------------
  96
  97 wxProgressDialog::wxProgressDialog(const wxString& title,
  98                                    const wxString& message,
  99                                    int maximum,
 100                                    wxWindow *parent,
 101                                    int style)
 102                 : wxDialog(GetParentForModalDialog(parent, style), wxID_ANY, title),
 103                   m_skip(false),
 104                   m_delay(3),
 105                   m_hasAbortButton(false),
 106                   m_hasSkipButton(false)
 107 {
 108     // we may disappear at any moment, let the others know about it
 109     SetExtraStyle(GetExtraStyle() | wxWS_EX_TRANSIENT);
 110     m_windowStyle |= style;
 111
 112     m_hasAbortButton = (style & wxPD_CAN_ABORT) != 0;
 113     m_hasSkipButton = (style & wxPD_CAN_SKIP) != 0;
 114
 115 #if defined(__WXMSW__) && !defined(__WXUNIVERSAL__)
 116     // we have to remove the "Close" button from the title bar then as it is
 117     // confusing to have it - it doesn't work anyhow
 118     //
 119     // FIXME: should probably have a (extended?) window style for this
 120     if ( !m_hasAbortButton )
 121     {
 122         EnableCloseButton(false);
 123     }
 124 #endif // wxMSW
 125
 126 #if defined(__SMARTPHONE__)
 127     SetLeftMenu();
 128 #endif
 129
 130     m_state = m_hasAbortButton ? Continue : Uncancelable;
 131     m_maximum = maximum;
 132
 133 #if defined(__WXMSW__) || defined(__WXPM__)
 134     // we can't have values > 65,536 in the progress control under Windows, so
 135     // scale everything down
 136     m_factor = m_maximum / 65536 + 1;
 137     m_maximum /= m_factor;
 138 #endif // __WXMSW__
 139
 140     m_parentTop = wxGetTopLevelParent(parent);
 141
 142     // top-level sizerTop
 143     wxSizer * const sizerTop = new wxBoxSizer(wxVERTICAL);
 144
 145     m_msg = new wxStaticText(this, wxID_ANY, message);
 146     sizerTop->Add(m_msg, 0, wxLEFT | wxTOP, 2*LAYOUT_MARGIN);
 147
 148     if ( maximum > 0 )
 149     {
 150         int gauge_style = wxGA_HORIZONTAL;
 151         if ( style & wxPD_SMOOTH )
 152             gauge_style |= wxGA_SMOOTH;
 153         m_gauge = new wxGauge
 154                       (
 155                         this,
 156                         wxID_ANY,
 157                         m_maximum,
 158                         wxDefaultPosition,
 159                         // make the progress bar sufficiently long
 160                         wxSize(wxMin(wxGetClientDisplayRect().width/3, 300), -1),
 161                         gauge_style
 162                       );
 163
 164         sizerTop->Add(m_gauge, 0, wxLEFT | wxRIGHT | wxTOP | wxEXPAND, 2*LAYOUT_MARGIN);
 165         m_gauge->SetValue(0);
 166     }
 167     else
 168     {
 169         m_gauge = NULL;
 170     }
 171
 172     // create the estimated/remaining/total time zones if requested
 173     m_elapsed =
 174     m_estimated =
 175     m_remaining = NULL;
 176     m_display_estimated =
 177     m_last_timeupdate =
 178     m_break = 0;
 179     m_ctdelay = 0;
 180
 181     // also count how many labels we really have
 182     size_t nTimeLabels = 0;
 183
 184     wxSizer * const sizerLabels = new wxFlexGridSizer(2);
 185
 186     if ( style & wxPD_ELAPSED_TIME )
 187     {
 188         nTimeLabels++;
 189
 190         m_elapsed = CreateLabel(_("Elapsed time:"), sizerLabels);
 191     }
 192
 193     if ( style & wxPD_ESTIMATED_TIME )
 194     {
 195         nTimeLabels++;
 196
 197         m_estimated = CreateLabel(_("Estimated time:"), sizerLabels);
 198     }
 199
 200     if ( style & wxPD_REMAINING_TIME )
 201     {
 202         nTimeLabels++;
 203
 204         m_remaining = CreateLabel(_("Remaining time:"), sizerLabels);
 205     }
 206     sizerTop->Add(sizerLabels, 0, wxALIGN_CENTER_HORIZONTAL | wxTOP, LAYOUT_MARGIN);
 207
 208     if ( nTimeLabels > 0 )
 209     {
 210         // set it to the current time
 211         m_timeStart = wxGetCurrentTime();
 212     }
 213
 214 #if defined(__SMARTPHONE__)
 215     if ( m_hasSkipButton )
 216         SetRightMenu(wxID_SKIP, _("Skip"));
 217     if ( m_hasAbortButton )
 218         SetLeftMenu(wxID_CANCEL);
 219 #else
 220     m_btnAbort =
 221     m_btnSkip = NULL;
 222
 223     wxBoxSizer *buttonSizer = new wxBoxSizer(wxHORIZONTAL);
 224
 225     // Windows dialogs usually have buttons in the lower right corner
 226     const int sizerFlags =
 227 #if defined(__WXMSW__) || defined(__WXPM__)
 228                            wxALIGN_RIGHT | wxALL
 229 #else // !MSW
 230                            wxALIGN_CENTER_HORIZONTAL | wxBOTTOM | wxTOP
 231 #endif // MSW/!MSW
 232                            ;
 233
 234     if ( m_hasSkipButton )
 235     {
 236         m_btnSkip = new wxButton(this, wxID_SKIP, _("&Skip"));
 237
 238         buttonSizer->Add(m_btnSkip, 0, sizerFlags, LAYOUT_MARGIN);
 239     }
 240
 241     if ( m_hasAbortButton )
 242     {
 243         m_btnAbort = new wxButton(this, wxID_CANCEL);
 244
 245         buttonSizer->Add(m_btnAbort, 0, sizerFlags, LAYOUT_MARGIN);
 246     }
 247
 248     sizerTop->Add(buttonSizer, 0, sizerFlags, LAYOUT_MARGIN );
 249 #endif // __SMARTPHONE__/!__SMARTPHONE__
 250
 251     SetSizerAndFit(sizerTop);
 252
 253     Centre(wxCENTER_FRAME | wxBOTH);
 254
 255     if ( style & wxPD_APP_MODAL )
 256     {
 257         m_winDisabler = new wxWindowDisabler(this);
 258     }
 259     else
 260     {
 261         if ( m_parentTop )
 262             m_parentTop->Disable();
 263         m_winDisabler = NULL;
 264     }
 265
 266     Show();
 267     Enable();
 268
 269     // this one can be initialized even if the others are unknown for now
 270     //
 271     // NB: do it after calling Layout() to keep the labels correctly aligned
 272     if ( m_elapsed )
 273     {
 274         SetTimeLabel(0, m_elapsed);
 275     }
 276
 277     Update();
 278 }
 279
 280 wxStaticText *
 281 wxProgressDialog::CreateLabel(const wxString& text, wxSizer *sizer)
 282 {
 283     wxStaticText *label = new wxStaticText(this, wxID_ANY, text);
 284     wxStaticText *value = new wxStaticText(this, wxID_ANY, _("unknown"));
 285
 286     // select placement most native or nice on target GUI
 287 #if defined(__SMARTPHONE__)
 288     // value and time to the left in two rows
 289     sizer->Add(label, 1, wxALIGN_LEFT);
 290     sizer->Add(value, 1, wxALIGN_LEFT);
 291 #elif defined(__WXMSW__) || defined(__WXPM__) || defined(__WXMAC__) || defined(__WXGTK20__)
 292     // value and time centered in one row
 293     sizer->Add(label, 1, wxLARGESMALL(wxALIGN_RIGHT,wxALIGN_LEFT) | wxTOP | wxRIGHT, LAYOUT_MARGIN);
 294     sizer->Add(value, 1, wxALIGN_LEFT | wxTOP, LAYOUT_MARGIN);
 295 #else
 296     // value and time to the right in one row
 297     sizer->Add(label);
 298     sizer->Add(value, 0, wxLEFT, LAYOUT_MARGIN);
 299 #endif
 300
 301     return value;
 302 }
 303
 304 // ----------------------------------------------------------------------------
 305 // wxProgressDialog operations
 306 // ----------------------------------------------------------------------------
 307
 308 bool
 309 wxProgressDialog::Update(int value, const wxString& newmsg, bool *skip)
 310 {
 311     if ( !DoBeforeUpdate(skip) )
 312         return false;
 313
 314     wxASSERT_MSG( value == -1 || m_gauge, wxT("cannot update non existent dialog") );
 315
 316 #ifdef __WXMSW__
 317     value /= m_factor;
 318 #endif // __WXMSW__
 319
 320     wxASSERT_MSG( value <= m_maximum, wxT("invalid progress value") );
 321
 322     if ( m_gauge )
 323         m_gauge->SetValue(value);
 324
 325     UpdateMessage(newmsg);
 326
 327     if ( (m_elapsed || m_remaining || m_estimated) && (value != 0) )
 328     {
 329         unsigned long elapsed = wxGetCurrentTime() - m_timeStart;
 330         if (    m_last_timeupdate < elapsed
 331              || value == m_maximum
 332            )
 333         {
 334             m_last_timeupdate = elapsed;
 335             unsigned long estimated = m_break +
 336                   (unsigned long)(( (double) (elapsed-m_break) * m_maximum ) / ((double)value)) ;
 337             if (    estimated > m_display_estimated
 338                  && m_ctdelay >= 0
 339                )
 340             {
 341                 ++m_ctdelay;
 342             }
 343             else if (    estimated < m_display_estimated
 344                       && m_ctdelay <= 0
 345                     )
 346             {
 347                 --m_ctdelay;
 348             }
 349             else
 350             {
 351                 m_ctdelay = 0;
 352             }
 353             if (    m_ctdelay >= m_delay          // enough confirmations for a higher value
 354                  || m_ctdelay <= (m_delay*-1)     // enough confirmations for a lower value
 355                  || value == m_maximum            // to stay consistent
 356                  || elapsed > m_display_estimated // to stay consistent
 357                  || ( elapsed > 0 && elapsed < 4 ) // additional updates in the beginning
 358                )
 359             {
 360                 m_display_estimated = estimated;
 361                 m_ctdelay = 0;
 362             }
 363         }
 364
 365         long display_remaining = m_display_estimated - elapsed;
 366         if ( display_remaining < 0 )
 367         {
 368             display_remaining = 0;
 369         }
 370
 371         SetTimeLabel(elapsed, m_elapsed);
 372         SetTimeLabel(m_display_estimated, m_estimated);
 373         SetTimeLabel(display_remaining, m_remaining);
 374     }
 375
 376     if ( value == m_maximum )
 377     {
 378         if ( m_state == Finished )
 379         {
 380             // ignore multiple calls to Update(m_maximum): it may sometimes be
 381             // troublesome to ensure that Update() is not called twice with the
 382             // same value (e.g. because of the rounding errors) and if we don't
 383             // return now we're going to generate asserts below
 384             return true;
 385         }
 386
 387         // so that we return true below and that out [Cancel] handler knew what
 388         // to do
 389         m_state = Finished;
 390         if( !HasFlag(wxPD_AUTO_HIDE) )
 391         {
 392             EnableClose();
 393             DisableSkip();
 394 #if defined(__WXMSW__) && !defined(__WXUNIVERSAL__)
 395             EnableCloseButton();
 396 #endif // __WXMSW__
 397
 398             if ( newmsg.empty() )
 399             {
 400                 // also provide the finishing message if the application didn't
 401                 m_msg->SetLabel(_("Done."));
 402             }
 403
 404             wxCHECK_MSG(wxEventLoopBase::GetActive(), false,
 405                         "wxProgressDialog::Update needs a running event loop");
 406
 407             // allow the window to repaint:
 408             // NOTE: since we yield only for UI events with this call, there
 409             //       should be no side-effects
 410             wxEventLoopBase::GetActive()->YieldFor(wxEVT_CATEGORY_UI);
 411
 412             // NOTE: this call results in a new event loop being created
 413             //       and to a call to ProcessPendingEvents() (which may generate
 414             //       unwanted re-entrancies).
 415             (void)ShowModal();
 416         }
 417         else // auto hide
 418         {
 419             // reenable other windows before hiding this one because otherwise
 420             // Windows wouldn't give the focus back to the window which had
 421             // been previously focused because it would still be disabled
 422             ReenableOtherWindows();
 423
 424             Hide();
 425         }
 426     }
 427     else // not at maximum yet
 428     {
 429         DoAfterUpdate();
 430     }
 431
 432     // update the display in case yielding above didn't do it
 433     Update();
 434
 435     return m_state != Canceled;
 436 }
 437
 438 bool wxProgressDialog::Pulse(const wxString& newmsg, bool *skip)
 439 {
 440     if ( !DoBeforeUpdate(skip) )
 441         return false;
 442
 443     wxASSERT_MSG( m_gauge, wxT("cannot update non existent dialog") );
 444
 445     // show a bit of progress
 446     m_gauge->Pulse();
 447
 448     UpdateMessage(newmsg);
 449
 450     if (m_elapsed || m_remaining || m_estimated)
 451     {
 452         unsigned long elapsed = wxGetCurrentTime() - m_timeStart;
 453
 454         SetTimeLabel(elapsed, m_elapsed);
 455         SetTimeLabel((unsigned long)-1, m_estimated);
 456         SetTimeLabel((unsigned long)-1, m_remaining);
 457     }
 458
 459     DoAfterUpdate();
 460
 461     return m_state != Canceled;
 462 }
 463
 464 bool wxProgressDialog::DoBeforeUpdate(bool *skip)
 465 {
 466     wxCHECK_MSG(wxEventLoopBase::GetActive(), false,
 467                 "wxProgressDialog::DoBeforeUpdate needs a running event loop");
 468
 469     // we have to yield because not only we want to update the display but
 470     // also to process the clicks on the cancel and skip buttons
 471     // NOTE: using YieldFor() this call shouldn't give re-entrancy problems
 472     //       for event handlers not interested to UI/user-input events.
 473     wxEventLoopBase::GetActive()->YieldFor(wxEVT_CATEGORY_UI|wxEVT_CATEGORY_USER_INPUT);
 474
 475     Update();
 476
 477     if ( m_skip && skip && !*skip )
 478     {
 479         *skip = true;
 480         m_skip = false;
 481         EnableSkip();
 482     }
 483
 484     return m_state != Canceled;
 485 }
 486
 487 void wxProgressDialog::DoAfterUpdate()
 488 {
 489     wxCHECK_RET(wxEventLoopBase::GetActive(),
 490                 "wxProgressDialog::DoAfterUpdate needs a running event loop");
 491
 492     // allow the window to repaint:
 493     // NOTE: since we yield only for UI events with this call, there
 494     //       should be no side-effects
 495     wxEventLoopBase::GetActive()->YieldFor(wxEVT_CATEGORY_UI);
 496 }
 497
 498 void wxProgressDialog::Resume()
 499 {
 500     m_state = Continue;
 501     m_ctdelay = m_delay; // force an update of the elapsed/estimated/remaining time
 502     m_break += wxGetCurrentTime()-m_timeStop;
 503
 504     EnableAbort();
 505     EnableSkip();
 506     m_skip = false;
 507 }
 508
 509 bool wxProgressDialog::Show( bool show )
 510 {
 511     // reenable other windows before hiding this one because otherwise
 512     // Windows wouldn't give the focus back to the window which had
 513     // been previously focused because it would still be disabled
 514     if(!show)
 515         ReenableOtherWindows();
 516
 517     return wxDialog::Show(show);
 518 }
 519
 520 int wxProgressDialog::GetValue() const
 521 {
 522     if (m_gauge)
 523         return m_gauge->GetValue();
 524     return wxNOT_FOUND;
 525 }
 526
 527 int wxProgressDialog::GetRange() const
 528 {
 529     if (m_gauge)
 530         return m_gauge->GetRange();
 531     return wxNOT_FOUND;
 532 }
 533
 534 wxString wxProgressDialog::GetMessage() const
 535 {
 536     return m_msg->GetLabel();
 537 }
 538
 539 void wxProgressDialog::SetRange(int maximum)
 540 {
 541     wxASSERT_MSG(m_gauge, "The dialog should have been constructed with a range > 0");
 542     wxASSERT_MSG(maximum > 0, "Invalid range");
 543
 544     m_gauge->SetRange(maximum);
 545     m_maximum = maximum;
 546
 547 #if defined(__WXMSW__) || defined(__WXPM__)
 548     // we can't have values > 65,536 in the progress control under Windows, so
 549     // scale everything down
 550     m_factor = m_maximum / 65536 + 1;
 551     m_maximum /= m_factor;
 552 #endif // __WXMSW__
 553 }
 554
 555
 556 bool wxProgressDialog::WasCancelled() const
 557 {
 558     return m_hasAbortButton && m_state == Canceled;
 559 }
 560
 561 bool wxProgressDialog::WasSkipped() const
 562 {
 563     return m_hasSkipButton && m_skip;
 564 }
 565
 566
 567 // ----------------------------------------------------------------------------
 568 // event handlers
 569 // ----------------------------------------------------------------------------
 570
 571 void wxProgressDialog::OnCancel(wxCommandEvent& event)
 572 {
 573     if ( m_state == Finished )
 574     {
 575         // this means that the count down is already finished and we're being
 576         // shown as a modal dialog - so just let the default handler do the job
 577         event.Skip();
 578     }
 579     else
 580     {
 581         // request to cancel was received, the next time Update() is called we
 582         // will handle it
 583         m_state = Canceled;
 584
 585         // update the buttons state immediately so that the user knows that the
 586         // request has been noticed
 587         DisableAbort();
 588         DisableSkip();
 589
 590         // save the time when the dialog was stopped
 591         m_timeStop = wxGetCurrentTime();
 592     }
 593 }
 594
 595 void wxProgressDialog::OnSkip(wxCommandEvent& WXUNUSED(event))
 596 {
 597     DisableSkip();
 598     m_skip = true;
 599 }
 600
 601 void wxProgressDialog::OnClose(wxCloseEvent& event)
 602 {
 603     if ( m_state == Uncancelable )
 604     {
 605         // can't close this dialog
 606         event.Veto();
 607     }
 608     else if ( m_state == Finished )
 609     {
 610         // let the default handler close the window as we already terminated
 611         event.Skip();
 612     }
 613     else
 614     {
 615         // next Update() will notice it
 616         m_state = Canceled;
 617         DisableAbort();
 618         DisableSkip();
 619
 620         m_timeStop = wxGetCurrentTime();
 621     }
 622 }
 623
 624 // ----------------------------------------------------------------------------
 625 // destruction
 626 // ----------------------------------------------------------------------------
 627
 628 wxProgressDialog::~wxProgressDialog()
 629 {
 630     // normally this should have been already done, but just in case
 631     ReenableOtherWindows();
 632 }
 633
 634 void wxProgressDialog::ReenableOtherWindows()
 635 {
 636     if ( HasFlag(wxPD_APP_MODAL) )
 637     {
 638         delete m_winDisabler;
 639         m_winDisabler = NULL;
 640     }
 641     else
 642     {
 643         if ( m_parentTop )
 644             m_parentTop->Enable();
 645     }
 646 }
 647
 648 // ----------------------------------------------------------------------------
 649 // private functions
 650 // ----------------------------------------------------------------------------
 651
 652 static void SetTimeLabel(unsigned long val, wxStaticText *label)
 653 {
 654     if ( label )
 655     {
 656         wxString s;
 657
 658         if (val != (unsigned long)-1)
 659         {
 660             unsigned long hours = val / 3600;
 661             unsigned long minutes = (val % 3600) / 60;
 662             unsigned long seconds = val % 60;
 663             s.Printf(wxT("%lu:%02lu:%02lu"), hours, minutes, seconds);
 664         }
 665         else
 666         {
 667             s = _("Unknown");
 668         }
 669
 670         if ( s != label->GetLabel() )
 671             label->SetLabel(s);
 672     }
 673 }
 674
 675 void wxProgressDialog::EnableSkip(bool enable)
 676 {
 677     if(m_hasSkipButton)
 678     {
 679 #ifdef __SMARTPHONE__
 680         if(enable)
 681             SetRightMenu(wxID_SKIP, _("Skip"));
 682         else
 683             SetRightMenu();
 684 #else
 685         if(m_btnSkip)
 686             m_btnSkip->Enable(enable);
 687 #endif
 688     }
 689 }
 690
 691 void wxProgressDialog::EnableAbort(bool enable)
 692 {
 693     if(m_hasAbortButton)
 694     {
 695 #ifdef __SMARTPHONE__
 696         if(enable)
 697             SetLeftMenu(wxID_CANCEL); // stock buttons makes Cancel label
 698         else
 699             SetLeftMenu();
 700 #else
 701         if(m_btnAbort)
 702             m_btnAbort->Enable(enable);
 703 #endif
 704     }
 705 }
 706
 707 void wxProgressDialog::EnableClose()
 708 {
 709     if(m_hasAbortButton)
 710     {
 711 #ifdef __SMARTPHONE__
 712         SetLeftMenu(wxID_CANCEL, _("Close"));
 713 #else
 714         if(m_btnAbort)
 715         {
 716             m_btnAbort->Enable();
 717             m_btnAbort->SetLabel(_("Close"));
 718         }
 719 #endif
 720     }
 721 }
 722
 723 void wxProgressDialog::UpdateMessage(const wxString &newmsg)
 724 {
 725     wxCHECK_RET(wxEventLoopBase::GetActive(),
 726                 "wxProgressDialog::UpdateMessage needs a running event loop");
 727
 728     if ( !newmsg.empty() && newmsg != m_msg->GetLabel() )
 729     {
 730         m_msg->SetLabel(newmsg);
 731
 732         // allow the window to repaint:
 733         // NOTE: since we yield only for UI events with this call, there
 734         //       should be no side-effects
 735         wxEventLoopBase::GetActive()->YieldFor(wxEVT_CATEGORY_UI);
 736     }
 737 }
 738
 739 #endif // wxUSE_PROGRESSDLG