src/motif/mdi.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        mdi.cpp
   3 // Purpose:     MDI classes
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     17/09/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "mdi.h"
  14 #endif
  15
  16 #ifdef __VMS
  17 #define XtDisplay XTDISPLAY
  18 #define XtWindow XTWINDOW
  19 #endif
  20
  21 #include "wx/mdi.h"
  22 #include "wx/menu.h"
  23 #include "wx/settings.h"
  24
  25 #ifdef __VMS__
  26 #pragma message disable nosimpint
  27 #endif
  28 #include <Xm/Xm.h>
  29 #include <Xm/BulletinB.h>
  30 #include <Xm/Form.h>
  31 #include <Xm/MainW.h>
  32 #include <Xm/RowColumn.h>
  33 #include <Xm/CascadeBG.h>
  34 #include <Xm/Text.h>
  35 #include <Xm/PushBG.h>
  36 #include <Xm/AtomMgr.h>
  37 #include <Xm/Protocols.h>
  38 #ifdef __VMS__
  39 #pragma message enable nosimpint
  40 #endif
  41
  42 #include "wx/motif/private.h"
  43
  44 extern wxList wxModelessWindows;
  45
  46 // Implemented in frame.cpp
  47 extern void wxFrameFocusProc(Widget workArea, XtPointer clientData,
  48                              XmAnyCallbackStruct *cbs);
  49
  50 #define wxID_NOTEBOOK_CLIENT_AREA wxID_HIGHEST + 100
  51
  52 IMPLEMENT_DYNAMIC_CLASS(wxMDIParentFrame, wxFrame)
  53 IMPLEMENT_DYNAMIC_CLASS(wxMDIChildFrame, wxFrame)
  54 IMPLEMENT_DYNAMIC_CLASS(wxMDIClientWindow, wxNotebook)
  55
  56 BEGIN_EVENT_TABLE(wxMDIParentFrame, wxFrame)
  57     EVT_SIZE(wxMDIParentFrame::OnSize)
  58     EVT_ACTIVATE(wxMDIParentFrame::OnActivate)
  59     EVT_SYS_COLOUR_CHANGED(wxMDIParentFrame::OnSysColourChanged)
  60     EVT_MENU_HIGHLIGHT_ALL(wxMDIParentFrame::OnMenuHighlight)
  61 END_EVENT_TABLE()
  62
  63 BEGIN_EVENT_TABLE(wxMDIClientWindow, wxNotebook)
  64     EVT_SCROLL(wxMDIClientWindow::OnScroll)
  65     EVT_NOTEBOOK_PAGE_CHANGED(wxID_NOTEBOOK_CLIENT_AREA, wxMDIClientWindow::OnPageChanged)
  66 END_EVENT_TABLE()
  67
  68
  69 // Parent frame
  70
  71 wxMDIParentFrame::wxMDIParentFrame()
  72 {
  73     m_clientWindow = (wxMDIClientWindow*) NULL;
  74     m_activeChild = (wxMDIChildFrame*) NULL;
  75     m_activeMenuBar = (wxMenuBar*) NULL;
  76 }
  77
  78 bool wxMDIParentFrame::Create(wxWindow *parent,
  79                               wxWindowID id,
  80                               const wxString& title,
  81                               const wxPoint& pos,
  82                               const wxSize& size,
  83                               long style,
  84                               const wxString& name)
  85 {
  86     m_clientWindow = (wxMDIClientWindow*) NULL;
  87     m_activeChild = (wxMDIChildFrame*) NULL;
  88     m_activeMenuBar = (wxMenuBar*) NULL;
  89
  90     bool success = wxFrame::Create(parent, id, title, pos, size, style, name);
  91     if (success)
  92     {
  93         // TODO: app cannot override OnCreateClient since
  94         // wxMDIParentFrame::OnCreateClient will still be called
  95         // (we're in the constructor). How to resolve?
  96
  97         m_clientWindow = OnCreateClient();
  98
  99         // Uses own style for client style
 100         m_clientWindow->CreateClient(this, GetWindowStyleFlag());
 101
 102         int w, h;
 103         GetClientSize(& w, & h);
 104         m_clientWindow->SetSize(0, 0, w, h);
 105         return TRUE;
 106     }
 107     else
 108         return FALSE;
 109 }
 110
 111 wxMDIParentFrame::~wxMDIParentFrame()
 112 {
 113     // Make sure we delete the client window last of all
 114     RemoveChild(m_clientWindow);
 115
 116     DestroyChildren();
 117
 118     delete m_clientWindow;
 119     m_clientWindow = NULL;
 120 }
 121
 122 void wxMDIParentFrame::SetMenuBar(wxMenuBar *menu_bar)
 123 {
 124     m_frameMenuBar = menu_bar;
 125
 126     SetChildMenuBar((wxMDIChildFrame*) NULL);
 127 }
 128
 129 void wxMDIParentFrame::OnSize(wxSizeEvent& WXUNUSED(event))
 130 {
 131 #if wxUSE_CONSTRAINTS
 132     if (GetAutoLayout())
 133         Layout();
 134 #endif
 135     int x = 0;
 136     int y = 0;
 137     int width, height;
 138     GetClientSize(&width, &height);
 139
 140     if ( GetClientWindow() )
 141         GetClientWindow()->SetSize(x, y, width, height);
 142 }
 143
 144 void wxMDIParentFrame::DoGetClientSize(int *width, int *height) const
 145 {
 146     wxFrame::DoGetClientSize(width, height);
 147 }
 148
 149 void wxMDIParentFrame::OnActivate(wxActivateEvent& WXUNUSED(event))
 150 {
 151     // Do nothing
 152 }
 153
 154 // Returns the active MDI child window
 155 wxMDIChildFrame *wxMDIParentFrame::GetActiveChild() const
 156 {
 157     return m_activeChild;
 158 }
 159
 160 // Create the client window class (don't Create the window,
 161 // just return a new class)
 162 wxMDIClientWindow *wxMDIParentFrame::OnCreateClient()
 163 {
 164     return new wxMDIClientWindow ;
 165 }
 166
 167 // Set the child's menu into the parent frame
 168 void wxMDIParentFrame::SetChildMenuBar(wxMDIChildFrame* child)
 169 {
 170     wxMenuBar* oldMenuBar = m_activeMenuBar;
 171
 172     if (child == (wxMDIChildFrame*) NULL)  // No child: use parent frame
 173     {
 174         if (GetMenuBar() && (GetMenuBar() != m_activeMenuBar))
 175         {
 176             //            if (m_activeMenuBar)
 177             //                m_activeMenuBar->DestroyMenuBar();
 178
 179             m_activeMenuBar = GetMenuBar();
 180             m_activeMenuBar->CreateMenuBar(this);
 181             /*
 182             if (oldMenuBar && XtIsManaged((Widget) oldMenuBar->GetMainWidget()))
 183             XtUnmanageChild((Widget) oldMenuBar->GetMainWidget());
 184             */
 185             if (oldMenuBar && oldMenuBar->GetMainWidget())
 186                 XtUnmapWidget((Widget) oldMenuBar->GetMainWidget());
 187
 188         }
 189     }
 190     else if (child->GetMenuBar() == (wxMenuBar*) NULL) // No child menu bar: use parent frame
 191     {
 192         if (GetMenuBar() && (GetMenuBar() != m_activeMenuBar))
 193         {
 194             //            if (m_activeMenuBar)
 195             //                m_activeMenuBar->DestroyMenuBar();
 196             m_activeMenuBar = GetMenuBar();
 197             m_activeMenuBar->CreateMenuBar(this);
 198             /*
 199             if (oldMenuBar && XtIsManaged((Widget) oldMenuBar->GetMainWidget()))
 200             XtUnmanageChild((Widget) oldMenuBar->GetMainWidget());
 201             */
 202             if (oldMenuBar && oldMenuBar->GetMainWidget())
 203                 XtUnmapWidget((Widget) oldMenuBar->GetMainWidget());
 204         }
 205     }
 206     else // The child has a menubar
 207     {
 208         if (child->GetMenuBar() != m_activeMenuBar)
 209         {
 210             //            if (m_activeMenuBar)
 211             //                m_activeMenuBar->DestroyMenuBar();
 212
 213             m_activeMenuBar = child->GetMenuBar();
 214             m_activeMenuBar->CreateMenuBar(this);
 215             /*
 216             if (oldMenuBar && XtIsManaged((Widget) oldMenuBar->GetMainWidget()))
 217             XtUnmanageChild((Widget) oldMenuBar->GetMainWidget());
 218             */
 219             if (oldMenuBar && oldMenuBar->GetMainWidget())
 220                 XtUnmapWidget((Widget) oldMenuBar->GetMainWidget());
 221         }
 222     }
 223 }
 224
 225 // Redirect events to active child first
 226 bool wxMDIParentFrame::ProcessEvent(wxEvent& event)
 227 {
 228     // Stops the same event being processed repeatedly
 229     static wxEventType inEvent = wxEVT_NULL;
 230     if (inEvent == event.GetEventType())
 231         return FALSE;
 232
 233     inEvent = event.GetEventType();
 234
 235     bool res = FALSE;
 236     if (m_activeChild && event.IsKindOf(CLASSINFO(wxCommandEvent)))
 237     {
 238         res = m_activeChild->GetEventHandler()->ProcessEvent(event);
 239     }
 240
 241     if (!res)
 242         res = GetEventHandler()->wxEvtHandler::ProcessEvent(event);
 243
 244     inEvent = wxEVT_NULL;
 245
 246     return res;
 247 }
 248
 249 void wxMDIParentFrame::DoSetSize(int x, int y,
 250                                  int width, int height,
 251                                  int sizeFlags)
 252 {
 253     wxWindow::DoSetSize(x, y, width, height, sizeFlags);
 254 }
 255
 256 void wxMDIParentFrame::DoSetClientSize(int width, int height)
 257 {
 258     wxWindow::DoSetClientSize(width, height);
 259 }
 260
 261 // Responds to colour changes, and passes event on to children.
 262 void wxMDIParentFrame::OnSysColourChanged(wxSysColourChangedEvent& event)
 263 {
 264     // TODO
 265
 266     // Propagate the event to the non-top-level children
 267     wxFrame::OnSysColourChanged(event);
 268 }
 269
 270 // MDI operations
 271 void wxMDIParentFrame::Cascade()
 272 {
 273     // TODO
 274 }
 275
 276 void wxMDIParentFrame::Tile()
 277 {
 278     // TODO
 279 }
 280
 281 void wxMDIParentFrame::ArrangeIcons()
 282 {
 283     // TODO
 284 }
 285
 286 void wxMDIParentFrame::ActivateNext()
 287 {
 288     // TODO
 289 }
 290
 291 void wxMDIParentFrame::ActivatePrevious()
 292 {
 293     // TODO
 294 }
 295
 296 // Default menu selection behaviour - display a help string
 297 void wxMDIParentFrame::OnMenuHighlight(wxMenuEvent& event)
 298 {
 299     if (GetStatusBar())
 300     {
 301         if (event.GetMenuId() == -1)
 302             SetStatusText("");
 303         else
 304         {
 305             wxMenuBar *menuBar = (wxMenuBar*) NULL;
 306             if (GetActiveChild())
 307               menuBar = GetActiveChild()->GetMenuBar();
 308             else
 309               menuBar = GetMenuBar();
 310             if (menuBar)
 311             {
 312                 wxString helpString(menuBar->GetHelpString(event.GetMenuId()));
 313                 if (helpString != "")
 314                     SetStatusText(helpString);
 315             }
 316         }
 317     }
 318 }
 319
 320 // Child frame
 321
 322 wxMDIChildFrame::wxMDIChildFrame()
 323 {
 324     m_mdiParentFrame = (wxMDIParentFrame*) NULL;
 325 }
 326
 327 bool wxMDIChildFrame::Create(wxMDIParentFrame *parent,
 328                              wxWindowID id,
 329                              const wxString& title,
 330                              const wxPoint& pos,
 331                              const wxSize& size,
 332                              long style,
 333                              const wxString& name)
 334 {
 335     SetName(name);
 336     SetWindowStyleFlag(style);
 337
 338     m_backgroundColour = wxSystemSettings::GetSystemColour(wxSYS_COLOUR_APPWORKSPACE);
 339     m_foregroundColour = *wxBLACK;
 340     m_font = wxSystemSettings::GetSystemFont(wxSYS_DEFAULT_GUI_FONT);
 341
 342     if ( id > -1 )
 343         m_windowId = id;
 344     else
 345         m_windowId = (int)NewControlId();
 346
 347     wxMDIClientWindow* clientWindow = parent->GetClientWindow();
 348
 349     wxASSERT_MSG( (clientWindow != (wxWindow*) NULL), "Missing MDI client window.");
 350
 351     if (clientWindow) clientWindow->AddChild(this);
 352
 353     SetMDIParentFrame(parent);
 354
 355     int width = size.x;
 356     int height = size.y;
 357     if (width == -1)
 358         width = 200; // TODO: give reasonable default
 359     if (height == -1)
 360         height = 200; // TODO: give reasonable default
 361
 362     // We're deactivating the old child
 363     wxMDIChildFrame* oldActiveChild = parent->GetActiveChild();
 364     if (oldActiveChild)
 365     {
 366         wxActivateEvent event(wxEVT_ACTIVATE, FALSE, oldActiveChild->GetId());
 367         event.SetEventObject( oldActiveChild );
 368         oldActiveChild->GetEventHandler()->ProcessEvent(event);
 369     }
 370
 371     // This is the currently active child
 372     parent->SetActiveChild((wxMDIChildFrame*) this);
 373
 374     // This time we'll try a bog-standard bulletin board for
 375     // the 'frame'. A main window doesn't seem to work.
 376
 377     m_mainWidget = (WXWidget) XtVaCreateWidget("client",
 378         xmBulletinBoardWidgetClass, (Widget) clientWindow->GetTopWidget(),
 379         XmNmarginWidth, 0,
 380         XmNmarginHeight, 0,
 381         /*
 382         XmNrightAttachment, XmATTACH_FORM,
 383         XmNleftAttachment, XmATTACH_FORM,
 384         XmNtopAttachment, XmATTACH_FORM,
 385         XmNbottomAttachment, XmATTACH_FORM,
 386         */
 387         XmNresizePolicy, XmRESIZE_NONE,
 388         NULL);
 389
 390     XtAddEventHandler((Widget) m_mainWidget, ExposureMask,FALSE,
 391         wxUniversalRepaintProc, (XtPointer) this);
 392
 393     SetCanAddEventHandler(TRUE);
 394     AttachWidget (parent, m_mainWidget, (WXWidget) NULL, pos.x, pos.y, size.x, size.y);
 395
 396     ChangeBackgroundColour();
 397
 398     XtManageChild((Widget) m_mainWidget);
 399
 400     SetTitle(title);
 401
 402     clientWindow->AddPage(this, title, TRUE);
 403     clientWindow->Refresh();
 404
 405     // Positions the toolbar and status bar -- but we don't have any.
 406     //    PreResize();
 407
 408     wxModelessWindows.Append(this);
 409     return TRUE;
 410 }
 411
 412
 413 wxMDIChildFrame::~wxMDIChildFrame()
 414 {
 415     if (m_mainWidget)
 416       XtRemoveEventHandler((Widget) m_mainWidget, ExposureMask,FALSE,
 417         wxUniversalRepaintProc, (XtPointer) this);
 418
 419     if (GetMDIParentFrame())
 420     {
 421         wxMDIParentFrame* parentFrame = GetMDIParentFrame();
 422
 423         if (parentFrame->GetActiveChild() == this)
 424             parentFrame->SetActiveChild((wxMDIChildFrame*) NULL);
 425         wxMDIClientWindow* clientWindow = parentFrame->GetClientWindow();
 426
 427         // Remove page if still there
 428         if (clientWindow->RemovePage(this))
 429             clientWindow->Refresh();
 430
 431         // Set the selection to the first remaining page
 432         if (clientWindow->GetPageCount() > 0)
 433         {
 434             wxMDIChildFrame* child = (wxMDIChildFrame*)  clientWindow->GetPage(0);
 435             parentFrame->SetActiveChild(child);
 436             parentFrame->SetChildMenuBar(child);
 437         }
 438         else
 439         {
 440             parentFrame->SetActiveChild((wxMDIChildFrame*) NULL);
 441             parentFrame->SetChildMenuBar((wxMDIChildFrame*) NULL);
 442         }
 443     }
 444 }
 445
 446 #if 0
 447 // Implementation: intercept and act upon raise and lower commands.
 448 void wxMDIChildFrame::OnRaise()
 449 {
 450     wxMDIParentFrame* parentFrame = (wxMDIParentFrame*) GetParent() ;
 451     wxMDIChildFrame* oldActiveChild = parentFrame->GetActiveChild();
 452     parentFrame->SetActiveChild(this);
 453
 454     if (oldActiveChild)
 455     {
 456         wxActivateEvent event(wxEVT_ACTIVATE, FALSE, oldActiveChild->GetId());
 457         event.SetEventObject( oldActiveChild );
 458         oldActiveChild->GetEventHandler()->ProcessEvent(event);
 459     }
 460
 461     wxActivateEvent event(wxEVT_ACTIVATE, TRUE, this->GetId());
 462     event.SetEventObject( this );
 463     this->GetEventHandler()->ProcessEvent(event);
 464 }
 465
 466 void wxMDIChildFrame::OnLower()
 467 {
 468     wxMDIParentFrame* parentFrame = (wxMDIParentFrame*) GetParent() ;
 469     wxMDIChildFrame* oldActiveChild = parentFrame->GetActiveChild();
 470
 471     if (oldActiveChild == this)
 472     {
 473         wxActivateEvent event(wxEVT_ACTIVATE, FALSE, oldActiveChild->GetId());
 474         event.SetEventObject( oldActiveChild );
 475         oldActiveChild->GetEventHandler()->ProcessEvent(event);
 476     }
 477     // TODO: unfortunately we don't now know which is the top-most child,
 478     // so make the active child NULL.
 479     parentFrame->SetActiveChild((wxMDIChildFrame*) NULL);
 480 }
 481 #endif
 482
 483 // Set the client size (i.e. leave the calculation of borders etc.
 484 // to wxWindows)
 485 void wxMDIChildFrame::DoSetClientSize(int width, int height)
 486 {
 487     wxWindow::DoSetClientSize(width, height);
 488 }
 489
 490 void wxMDIChildFrame::DoGetClientSize(int* width, int* height) const
 491 {
 492     wxWindow::DoGetSize(width, height);
 493 }
 494
 495 void wxMDIChildFrame::DoSetSize(int x, int y, int width, int height, int sizeFlags)
 496 {
 497     wxWindow::DoSetSize(x, y, width, height, sizeFlags);
 498 }
 499
 500 void wxMDIChildFrame::DoGetSize(int* width, int* height) const
 501 {
 502     wxWindow::DoGetSize(width, height);
 503 }
 504
 505 void wxMDIChildFrame::DoGetPosition(int *x, int *y) const
 506 {
 507     wxWindow::DoGetPosition(x, y);
 508 }
 509
 510 bool wxMDIChildFrame::Show(bool show)
 511 {
 512     m_visibleStatus = show; /* show-&-hide fix */
 513     return wxWindow::Show(show);
 514 }
 515
 516 void wxMDIChildFrame::SetMenuBar(wxMenuBar *menuBar)
 517 {
 518     // Don't create the underlying menubar yet; need to recreate
 519     // it every time the child is activated.
 520     m_frameMenuBar = menuBar;
 521
 522     // We make the assumption that if you're setting the menubar,
 523     // this is the currently active child.
 524     GetMDIParentFrame()->SetChildMenuBar(this);
 525 }
 526
 527 // Set icon
 528 void wxMDIChildFrame::SetIcon(const wxIcon& icon)
 529 {
 530     m_icon = icon;
 531     if (m_icon.Ok())
 532     {
 533         // Not appropriate since there are no icons in
 534         // a tabbed window
 535     }
 536 }
 537
 538 void wxMDIChildFrame::SetTitle(const wxString& title)
 539 {
 540     m_title = title;
 541     wxMDIClientWindow* clientWindow = GetMDIParentFrame()->GetClientWindow();
 542     int pageNo = clientWindow->FindPagePosition(this);
 543     if (pageNo > -1)
 544         clientWindow->SetPageText(pageNo, title);
 545 }
 546
 547 // MDI operations
 548 void wxMDIChildFrame::Maximize()
 549 {
 550     // TODO
 551 }
 552
 553 void wxMDIChildFrame::Iconize(bool WXUNUSED(iconize))
 554 {
 555     // TODO
 556 }
 557
 558 bool wxMDIChildFrame::IsIconized() const
 559 {
 560     return FALSE;
 561 }
 562
 563 // Is it maximized? Always maximized under Motif, using the
 564 // tabbed MDI implementation.
 565 bool wxMDIChildFrame::IsMaximized(void) const
 566 {
 567     return TRUE;
 568 }
 569
 570 void wxMDIChildFrame::Restore()
 571 {
 572     // TODO
 573 }
 574
 575 void wxMDIChildFrame::Activate()
 576 {
 577     // TODO
 578 }
 579
 580 void wxMDIChildFrame::CaptureMouse()
 581 {
 582     wxWindow::CaptureMouse();
 583 }
 584
 585 void wxMDIChildFrame::ReleaseMouse()
 586 {
 587     wxWindow::ReleaseMouse();
 588 }
 589
 590 void wxMDIChildFrame::Raise()
 591 {
 592     wxWindow::Raise();
 593 }
 594
 595 void wxMDIChildFrame::Lower(void)
 596 {
 597     wxWindow::Raise();
 598 }
 599
 600 void wxMDIChildFrame::SetSizeHints(int WXUNUSED(minW), int WXUNUSED(minH), int WXUNUSED(maxW), int WXUNUSED(maxH), int WXUNUSED(incW), int WXUNUSED(incH))
 601 {
 602 }
 603
 604 // Client window
 605
 606 wxMDIClientWindow::wxMDIClientWindow()
 607 {
 608 }
 609
 610 wxMDIClientWindow::~wxMDIClientWindow()
 611 {
 612     // By the time this destructor is called, the child frames will have been
 613     // deleted and removed from the notebook/client window.
 614     DestroyChildren();
 615
 616     m_mainWidget = (WXWidget) 0;
 617 }
 618
 619 bool wxMDIClientWindow::CreateClient(wxMDIParentFrame *parent, long style)
 620 {
 621     SetWindowStyleFlag(style);
 622
 623     //    m_windowParent = parent;
 624     //    m_backgroundColour = wxSystemSettings::GetSystemColour(wxSYS_COLOUR_APPWORKSPACE);
 625
 626     bool success = wxNotebook::Create(parent, wxID_NOTEBOOK_CLIENT_AREA, wxPoint(0, 0), wxSize(100, 100), 0);
 627     if (success)
 628     {
 629         wxFont font(10, wxSWISS, wxNORMAL, wxNORMAL);
 630         wxFont selFont(10, wxSWISS, wxNORMAL, wxBOLD);
 631         GetTabView()->SetTabFont(font);
 632         GetTabView()->SetSelectedTabFont(selFont);
 633         GetTabView()->SetTabSize(120, 18);
 634         GetTabView()->SetTabSelectionHeight(20);
 635         return TRUE;
 636     }
 637     else
 638         return FALSE;
 639 }
 640
 641 void wxMDIClientWindow::DoSetSize(int x, int y, int width, int height, int sizeFlags)
 642 {
 643     wxWindow::DoSetSize(x, y, width, height, sizeFlags);
 644 }
 645
 646 void wxMDIClientWindow::DoSetClientSize(int width, int height)
 647 {
 648     wxWindow::DoSetClientSize(width, height);
 649 }
 650
 651 void wxMDIClientWindow::DoGetClientSize(int *width, int *height) const
 652 {
 653     wxWindow::DoGetClientSize(width, height);
 654 }
 655
 656 void wxMDIClientWindow::DoGetSize(int *width, int *height) const
 657 {
 658     wxWindow::DoGetSize(width, height);
 659 }
 660
 661 void wxMDIClientWindow::DoGetPosition(int *x, int *y) const
 662 {
 663     wxWindow::DoGetPosition(x, y);
 664 }
 665
 666 void wxMDIClientWindow::OnScroll(wxScrollEvent& event)
 667 {
 668     //    Default(); // Default processing: OBSOLETE FUNCTION
 669     event.Skip();
 670 }
 671
 672 void wxMDIClientWindow::OnPageChanged(wxNotebookEvent& event)
 673 {
 674     // Notify child that it has been activated
 675     if (event.GetOldSelection() != -1)
 676     {
 677         wxMDIChildFrame* oldChild = (wxMDIChildFrame*) GetPage(event.GetOldSelection());
 678         if (oldChild)
 679         {
 680             wxActivateEvent event(wxEVT_ACTIVATE, FALSE, oldChild->GetId());
 681             event.SetEventObject( oldChild );
 682             oldChild->GetEventHandler()->ProcessEvent(event);
 683         }
 684     }
 685     if (event.GetSelection() != -1)
 686     {
 687         wxMDIChildFrame* activeChild = (wxMDIChildFrame*) GetPage(event.GetSelection());
 688         if (activeChild)
 689         {
 690             wxActivateEvent event(wxEVT_ACTIVATE, TRUE, activeChild->GetId());
 691             event.SetEventObject( activeChild );
 692             activeChild->GetEventHandler()->ProcessEvent(event);
 693
 694             if (activeChild->GetMDIParentFrame())
 695             {
 696                 activeChild->GetMDIParentFrame()->SetActiveChild(activeChild);
 697                 activeChild->GetMDIParentFrame()->SetChildMenuBar(activeChild);
 698             }
 699         }
 700     }
 701     event.Skip();
 702 }