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     if (!m_hasSkipButton && !m_hasAbortButton)
 249         buttonSizer->AddSpacer(LAYOUT_MARGIN);
 250
 251     sizerTop->Add(buttonSizer, 0, sizerFlags, LAYOUT_MARGIN );
 252 #endif // __SMARTPHONE__/!__SMARTPHONE__
 253
 254     SetSizerAndFit(sizerTop);
 255
 256     Centre(wxCENTER_FRAME | wxBOTH);
 257
 258     if ( style & wxPD_APP_MODAL )
 259     {
 260         m_winDisabler = new wxWindowDisabler(this);
 261     }
 262     else
 263     {
 264         if ( m_parentTop )
 265             m_parentTop->Disable();
 266         m_winDisabler = NULL;
 267     }
 268
 269     Show();
 270     Enable();
 271
 272     // this one can be initialized even if the others are unknown for now
 273     //
 274     // NB: do it after calling Layout() to keep the labels correctly aligned
 275     if ( m_elapsed )
 276     {
 277         SetTimeLabel(0, m_elapsed);
 278     }
 279
 280     Update();
 281 }
 282
 283 wxStaticText *
 284 wxProgressDialog::CreateLabel(const wxString& text, wxSizer *sizer)
 285 {
 286     wxStaticText *label = new wxStaticText(this, wxID_ANY, text);
 287     wxStaticText *value = new wxStaticText(this, wxID_ANY, _("unknown"));
 288
 289     // select placement most native or nice on target GUI
 290 #if defined(__SMARTPHONE__)
 291     // value and time to the left in two rows
 292     sizer->Add(label, 1, wxALIGN_LEFT);
 293     sizer->Add(value, 1, wxALIGN_LEFT);
 294 #elif defined(__WXMSW__) || defined(__WXPM__) || defined(__WXMAC__) || defined(__WXGTK20__)
 295     // value and time centered in one row
 296     sizer->Add(label, 1, wxLARGESMALL(wxALIGN_RIGHT,wxALIGN_LEFT) | wxTOP | wxRIGHT, LAYOUT_MARGIN);
 297     sizer->Add(value, 1, wxALIGN_LEFT | wxTOP, LAYOUT_MARGIN);
 298 #else
 299     // value and time to the right in one row
 300     sizer->Add(label);
 301     sizer->Add(value, 0, wxLEFT, LAYOUT_MARGIN);
 302 #endif
 303
 304     return value;
 305 }
 306
 307 // ----------------------------------------------------------------------------
 308 // wxProgressDialog operations
 309 // ----------------------------------------------------------------------------
 310
 311 bool
 312 wxProgressDialog::Update(int value, const wxString& newmsg, bool *skip)
 313 {
 314     if ( !DoBeforeUpdate(skip) )
 315         return false;
 316
 317     wxASSERT_MSG( value == -1 || m_gauge, wxT("cannot update non existent dialog") );
 318
 319 #ifdef __WXMSW__
 320     value /= m_factor;
 321 #endif // __WXMSW__
 322
 323     wxASSERT_MSG( value <= m_maximum, wxT("invalid progress value") );
 324
 325     if ( m_gauge )
 326         m_gauge->SetValue(value);
 327
 328     UpdateMessage(newmsg);
 329
 330     if ( (m_elapsed || m_remaining || m_estimated) && (value != 0) )
 331     {
 332         unsigned long elapsed = wxGetCurrentTime() - m_timeStart;
 333         if (    m_last_timeupdate < elapsed
 334              || value == m_maximum
 335            )
 336         {
 337             m_last_timeupdate = elapsed;
 338             unsigned long estimated = m_break +
 339                   (unsigned long)(( (double) (elapsed-m_break) * m_maximum ) / ((double)value)) ;
 340             if (    estimated > m_display_estimated
 341                  && m_ctdelay >= 0
 342                )
 343             {
 344                 ++m_ctdelay;
 345             }
 346             else if (    estimated < m_display_estimated
 347                       && m_ctdelay <= 0
 348                     )
 349             {
 350                 --m_ctdelay;
 351             }
 352             else
 353             {
 354                 m_ctdelay = 0;
 355             }
 356             if (    m_ctdelay >= m_delay          // enough confirmations for a higher value
 357                  || m_ctdelay <= (m_delay*-1)     // enough confirmations for a lower value
 358                  || value == m_maximum            // to stay consistent
 359                  || elapsed > m_display_estimated // to stay consistent
 360                  || ( elapsed > 0 && elapsed < 4 ) // additional updates in the beginning
 361                )
 362             {
 363                 m_display_estimated = estimated;
 364                 m_ctdelay = 0;
 365             }
 366         }
 367
 368         long display_remaining = m_display_estimated - elapsed;
 369         if ( display_remaining < 0 )
 370         {
 371             display_remaining = 0;
 372         }
 373
 374         SetTimeLabel(elapsed, m_elapsed);
 375         SetTimeLabel(m_display_estimated, m_estimated);
 376         SetTimeLabel(display_remaining, m_remaining);
 377     }
 378
 379     if ( value == m_maximum )
 380     {
 381         if ( m_state == Finished )
 382         {
 383             // ignore multiple calls to Update(m_maximum): it may sometimes be
 384             // troublesome to ensure that Update() is not called twice with the
 385             // same value (e.g. because of the rounding errors) and if we don't
 386             // return now we're going to generate asserts below
 387             return true;
 388         }
 389
 390         // so that we return true below and that out [Cancel] handler knew what
 391         // to do
 392         m_state = Finished;
 393         if( !HasFlag(wxPD_AUTO_HIDE) )
 394         {
 395             EnableClose();
 396             DisableSkip();
 397 #if defined(__WXMSW__) && !defined(__WXUNIVERSAL__)
 398             EnableCloseButton();
 399 #endif // __WXMSW__
 400
 401             if ( newmsg.empty() )
 402             {
 403                 // also provide the finishing message if the application didn't
 404                 m_msg->SetLabel(_("Done."));
 405             }
 406
 407             wxCHECK_MSG(wxEventLoopBase::GetActive(), false,
 408                         "wxProgressDialog::Update needs a running event loop");
 409
 410             // allow the window to repaint:
 411             // NOTE: since we yield only for UI events with this call, there
 412             //       should be no side-effects
 413             wxEventLoopBase::GetActive()->YieldFor(wxEVT_CATEGORY_UI);
 414
 415             // NOTE: this call results in a new event loop being created
 416             //       and to a call to ProcessPendingEvents() (which may generate
 417             //       unwanted re-entrancies).
 418             (void)ShowModal();
 419         }
 420         else // auto hide
 421         {
 422             // reenable other windows before hiding this one because otherwise
 423             // Windows wouldn't give the focus back to the window which had
 424             // been previously focused because it would still be disabled
 425             ReenableOtherWindows();
 426
 427             Hide();
 428         }
 429     }
 430     else // not at maximum yet
 431     {
 432         DoAfterUpdate();
 433     }
 434
 435     // update the display in case yielding above didn't do it
 436     Update();
 437
 438     return m_state != Canceled;
 439 }
 440
 441 bool wxProgressDialog::Pulse(const wxString& newmsg, bool *skip)
 442 {
 443     if ( !DoBeforeUpdate(skip) )
 444         return false;
 445
 446     wxASSERT_MSG( m_gauge, wxT("cannot update non existent dialog") );
 447
 448     // show a bit of progress
 449     m_gauge->Pulse();
 450
 451     UpdateMessage(newmsg);
 452
 453     if (m_elapsed || m_remaining || m_estimated)
 454     {
 455         unsigned long elapsed = wxGetCurrentTime() - m_timeStart;
 456
 457         SetTimeLabel(elapsed, m_elapsed);
 458         SetTimeLabel((unsigned long)-1, m_estimated);
 459         SetTimeLabel((unsigned long)-1, m_remaining);
 460     }
 461
 462     DoAfterUpdate();
 463
 464     return m_state != Canceled;
 465 }
 466
 467 bool wxProgressDialog::DoBeforeUpdate(bool *skip)
 468 {
 469     wxCHECK_MSG(wxEventLoopBase::GetActive(), false,
 470                 "wxProgressDialog::DoBeforeUpdate needs a running event loop");
 471
 472     // we have to yield because not only we want to update the display but
 473     // also to process the clicks on the cancel and skip buttons
 474     // NOTE: using YieldFor() this call shouldn't give re-entrancy problems
 475     //       for event handlers not interested to UI/user-input events.
 476     wxEventLoopBase::GetActive()->YieldFor(wxEVT_CATEGORY_UI|wxEVT_CATEGORY_USER_INPUT);
 477
 478     Update();
 479
 480     if ( m_skip && skip && !*skip )
 481     {
 482         *skip = true;
 483         m_skip = false;
 484         EnableSkip();
 485     }
 486
 487     return m_state != Canceled;
 488 }
 489
 490 void wxProgressDialog::DoAfterUpdate()
 491 {
 492     wxCHECK_RET(wxEventLoopBase::GetActive(),
 493                 "wxProgressDialog::DoAfterUpdate needs a running event loop");
 494
 495     // allow the window to repaint:
 496     // NOTE: since we yield only for UI events with this call, there
 497     //       should be no side-effects
 498     wxEventLoopBase::GetActive()->YieldFor(wxEVT_CATEGORY_UI);
 499 }
 500
 501 void wxProgressDialog::Resume()
 502 {
 503     m_state = Continue;
 504     m_ctdelay = m_delay; // force an update of the elapsed/estimated/remaining time
 505     m_break += wxGetCurrentTime()-m_timeStop;
 506
 507     EnableAbort();
 508     EnableSkip();
 509     m_skip = false;
 510 }
 511
 512 bool wxProgressDialog::Show( bool show )
 513 {
 514     // reenable other windows before hiding this one because otherwise
 515     // Windows wouldn't give the focus back to the window which had
 516     // been previously focused because it would still be disabled
 517     if(!show)
 518         ReenableOtherWindows();
 519
 520     return wxDialog::Show(show);
 521 }
 522
 523 int wxProgressDialog::GetValue() const
 524 {
 525     if (m_gauge)
 526         return m_gauge->GetValue();
 527     return wxNOT_FOUND;
 528 }
 529
 530 int wxProgressDialog::GetRange() const
 531 {
 532     if (m_gauge)
 533         return m_gauge->GetRange();
 534     return wxNOT_FOUND;
 535 }
 536
 537 wxString wxProgressDialog::GetMessage() const
 538 {
 539     return m_msg->GetLabel();
 540 }
 541
 542 void wxProgressDialog::SetRange(int maximum)
 543 {
 544     wxASSERT_MSG(m_gauge, "The dialog should have been constructed with a range > 0");
 545     wxASSERT_MSG(maximum > 0, "Invalid range");
 546
 547     m_gauge->SetRange(maximum);
 548     m_maximum = maximum;
 549
 550 #if defined(__WXMSW__) || defined(__WXPM__)
 551     // we can't have values > 65,536 in the progress control under Windows, so
 552     // scale everything down
 553     m_factor = m_maximum / 65536 + 1;
 554     m_maximum /= m_factor;
 555 #endif // __WXMSW__
 556 }
 557
 558
 559 bool wxProgressDialog::WasCancelled() const
 560 {
 561     return m_hasAbortButton && m_state == Canceled;
 562 }
 563
 564 bool wxProgressDialog::WasSkipped() const
 565 {
 566     return m_hasSkipButton && m_skip;
 567 }
 568
 569
 570 // ----------------------------------------------------------------------------
 571 // event handlers
 572 // ----------------------------------------------------------------------------
 573
 574 void wxProgressDialog::OnCancel(wxCommandEvent& event)
 575 {
 576     if ( m_state == Finished )
 577     {
 578         // this means that the count down is already finished and we're being
 579         // shown as a modal dialog - so just let the default handler do the job
 580         event.Skip();
 581     }
 582     else
 583     {
 584         // request to cancel was received, the next time Update() is called we
 585         // will handle it
 586         m_state = Canceled;
 587
 588         // update the buttons state immediately so that the user knows that the
 589         // request has been noticed
 590         DisableAbort();
 591         DisableSkip();
 592
 593         // save the time when the dialog was stopped
 594         m_timeStop = wxGetCurrentTime();
 595     }
 596 }
 597
 598 void wxProgressDialog::OnSkip(wxCommandEvent& WXUNUSED(event))
 599 {
 600     DisableSkip();
 601     m_skip = true;
 602 }
 603
 604 void wxProgressDialog::OnClose(wxCloseEvent& event)
 605 {
 606     if ( m_state == Uncancelable )
 607     {
 608         // can't close this dialog
 609         event.Veto();
 610     }
 611     else if ( m_state == Finished )
 612     {
 613         // let the default handler close the window as we already terminated
 614         event.Skip();
 615     }
 616     else
 617     {
 618         // next Update() will notice it
 619         m_state = Canceled;
 620         DisableAbort();
 621         DisableSkip();
 622
 623         m_timeStop = wxGetCurrentTime();
 624     }
 625 }
 626
 627 // ----------------------------------------------------------------------------
 628 // destruction
 629 // ----------------------------------------------------------------------------
 630
 631 wxProgressDialog::~wxProgressDialog()
 632 {
 633     // normally this should have been already done, but just in case
 634     ReenableOtherWindows();
 635 }
 636
 637 void wxProgressDialog::ReenableOtherWindows()
 638 {
 639     if ( HasFlag(wxPD_APP_MODAL) )
 640     {
 641         wxDELETE(m_winDisabler);
 642     }
 643     else
 644     {
 645         if ( m_parentTop )
 646             m_parentTop->Enable();
 647     }
 648 }
 649
 650 // ----------------------------------------------------------------------------
 651 // private functions
 652 // ----------------------------------------------------------------------------
 653
 654 static void SetTimeLabel(unsigned long val, wxStaticText *label)
 655 {
 656     if ( label )
 657     {
 658         wxString s;
 659
 660         if (val != (unsigned long)-1)
 661         {
 662             unsigned long hours = val / 3600;
 663             unsigned long minutes = (val % 3600) / 60;
 664             unsigned long seconds = val % 60;
 665             s.Printf(wxT("%lu:%02lu:%02lu"), hours, minutes, seconds);
 666         }
 667         else
 668         {
 669             s = _("Unknown");
 670         }
 671
 672         if ( s != label->GetLabel() )
 673             label->SetLabel(s);
 674     }
 675 }
 676
 677 void wxProgressDialog::EnableSkip(bool enable)
 678 {
 679     if(m_hasSkipButton)
 680     {
 681 #ifdef __SMARTPHONE__
 682         if(enable)
 683             SetRightMenu(wxID_SKIP, _("Skip"));
 684         else
 685             SetRightMenu();
 686 #else
 687         if(m_btnSkip)
 688             m_btnSkip->Enable(enable);
 689 #endif
 690     }
 691 }
 692
 693 void wxProgressDialog::EnableAbort(bool enable)
 694 {
 695     if(m_hasAbortButton)
 696     {
 697 #ifdef __SMARTPHONE__
 698         if(enable)
 699             SetLeftMenu(wxID_CANCEL); // stock buttons makes Cancel label
 700         else
 701             SetLeftMenu();
 702 #else
 703         if(m_btnAbort)
 704             m_btnAbort->Enable(enable);
 705 #endif
 706     }
 707 }
 708
 709 void wxProgressDialog::EnableClose()
 710 {
 711     if(m_hasAbortButton)
 712     {
 713 #ifdef __SMARTPHONE__
 714         SetLeftMenu(wxID_CANCEL, _("Close"));
 715 #else
 716         if(m_btnAbort)
 717         {
 718             m_btnAbort->Enable();
 719             m_btnAbort->SetLabel(_("Close"));
 720         }
 721 #endif
 722     }
 723 }
 724
 725 void wxProgressDialog::UpdateMessage(const wxString &newmsg)
 726 {
 727     wxCHECK_RET(wxEventLoopBase::GetActive(),
 728                 "wxProgressDialog::UpdateMessage needs a running event loop");
 729
 730     if ( !newmsg.empty() && newmsg != m_msg->GetLabel() )
 731     {
 732         m_msg->SetLabel(newmsg);
 733
 734         // allow the window to repaint:
 735         // NOTE: since we yield only for UI events with this call, there
 736         //       should be no side-effects
 737         wxEventLoopBase::GetActive()->YieldFor(wxEVT_CATEGORY_UI);
 738     }
 739 }
 740
 741 #endif // wxUSE_PROGRESSDLG