src/msw/dialog.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        dialog.cpp
   3 // Purpose:     wxDialog class
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "dialog.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20 #pragma hdrstop
  21 #endif
  22
  23 #ifndef WX_PRECOMP
  24 #include "wx/dialog.h"
  25 #include "wx/utils.h"
  26 #include "wx/frame.h"
  27 #include "wx/app.h"
  28 #include "wx/settings.h"
  29 #endif
  30
  31 #include "wx/msw/private.h"
  32 #include "wx/log.h"
  33
  34 #if wxUSE_COMMON_DIALOGS
  35 #include <commdlg.h>
  36 #endif
  37
  38 #define wxDIALOG_DEFAULT_X 300
  39 #define wxDIALOG_DEFAULT_Y 300
  40
  41 // Lists to keep track of windows, so we can disable/enable them
  42 // for modal dialogs
  43 wxList wxModalDialogs;
  44 wxList wxModelessWindows;  // Frames and modeless dialogs
  45 extern wxList WXDLLEXPORT wxPendingDelete;
  46
  47 #if !USE_SHARED_LIBRARY
  48     IMPLEMENT_DYNAMIC_CLASS(wxDialog, wxPanel)
  49
  50     BEGIN_EVENT_TABLE(wxDialog, wxPanel)
  51         EVT_SIZE(wxDialog::OnSize)
  52         EVT_BUTTON(wxID_OK, wxDialog::OnOK)
  53         EVT_BUTTON(wxID_APPLY, wxDialog::OnApply)
  54         EVT_BUTTON(wxID_CANCEL, wxDialog::OnCancel)
  55         EVT_CHAR_HOOK(wxDialog::OnCharHook)
  56         EVT_SYS_COLOUR_CHANGED(wxDialog::OnSysColourChanged)
  57         EVT_CLOSE(wxDialog::OnCloseWindow)
  58     END_EVENT_TABLE()
  59 #endif
  60
  61 bool wxDialog::MSWOnClose(void)
  62 {
  63     return Close();
  64 }
  65
  66 wxDialog::wxDialog(void)
  67 {
  68   m_isShown = FALSE;
  69   m_modalShowing = FALSE;
  70
  71   SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE));
  72 }
  73
  74 bool wxDialog::Create(wxWindow *parent, wxWindowID id,
  75                       const wxString& title,
  76                       const wxPoint& pos,
  77                       const wxSize& size,
  78                       long style,
  79                       const wxString& name)
  80 {
  81 #if wxUSE_TOOLTIPS
  82     m_hwndToolTip = 0;
  83 #endif
  84
  85     SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE));
  86     SetName(name);
  87
  88     if (!parent)
  89         wxTopLevelWindows.Append(this);
  90
  91     //  windowFont = wxTheFontList->FindOrCreateFont(11, wxSWISS, wxNORMAL, wxNORMAL);
  92
  93     if (parent) parent->AddChild(this);
  94
  95     if ( id == -1 )
  96         m_windowId = (int)NewControlId();
  97     else
  98         m_windowId = id;
  99
 100     int x = pos.x;
 101     int y = pos.y;
 102     int width = size.x;
 103     int height = size.y;
 104
 105     if (x < 0) x = wxDIALOG_DEFAULT_X;
 106     if (y < 0) y = wxDIALOG_DEFAULT_Y;
 107
 108     m_windowStyle = style;
 109
 110     m_isShown = FALSE;
 111     m_modalShowing = FALSE;
 112
 113     if (width < 0)
 114         width = 500;
 115     if (height < 0)
 116         height = 500;
 117
 118     // All dialogs should really have this style
 119     m_windowStyle |= wxTAB_TRAVERSAL;
 120
 121     WXDWORD extendedStyle = MakeExtendedStyle(m_windowStyle);
 122     if (m_windowStyle & wxSTAY_ON_TOP)
 123         extendedStyle |= WS_EX_TOPMOST;
 124
 125     // Allows creation of dialogs with & without captions under MSWindows,
 126     // resizeable or not (but a resizeable dialog always has caption -
 127     // otherwise it would look too strange)
 128     const char *dlg;
 129     if ( style & wxTHICK_FRAME )
 130         dlg = "wxResizeableDialog";
 131     else if ( style & wxCAPTION )
 132         dlg = "wxCaptionDialog";
 133     else
 134         dlg = "wxNoCaptionDialog";
 135     MSWCreate(m_windowId, parent, NULL, this, NULL,
 136               x, y, width, height,
 137               0, // style is not used if we have dlg template
 138               dlg,
 139               extendedStyle);
 140
 141     HWND hwnd = (HWND)GetHWND();
 142
 143     if ( !hwnd )
 144     {
 145         wxLogError(_("Failed to create dialog."));
 146
 147         return FALSE;
 148     }
 149
 150     SubclassWin(GetHWND());
 151
 152     SetWindowText(hwnd, title);
 153     SetFont(wxSystemSettings::GetSystemFont(wxSYS_DEFAULT_GUI_FONT));
 154
 155     return TRUE;
 156 }
 157
 158 void wxDialog::SetModal(bool flag)
 159 {
 160   if ( flag )
 161     m_windowStyle |= wxDIALOG_MODAL ;
 162   else
 163     if ( m_windowStyle & wxDIALOG_MODAL )
 164         m_windowStyle -= wxDIALOG_MODAL ;
 165
 166   wxModelessWindows.DeleteObject(this);
 167   if (!flag)
 168     wxModelessWindows.Append(this);
 169 }
 170
 171 wxDialog::~wxDialog()
 172 {
 173   m_isBeingDeleted = TRUE;
 174
 175   wxTopLevelWindows.DeleteObject(this);
 176
 177   if (m_modalShowing)
 178   {
 179     Show(FALSE);
 180     // For some reason, wxWindows can activate another task altogether
 181     // when a frame is destroyed after a modal dialog has been invoked.
 182     // Try to bring the parent to the top.
 183     // dfgg: I moved this following line from end of function -
 184     //       must not call if another window is on top!!
 185     //       This can often happen with Close() and delayed deleting
 186     if (GetParent() && GetParent()->GetHWND())
 187       ::BringWindowToTop((HWND) GetParent()->GetHWND());
 188   }
 189
 190   m_modalShowing = FALSE;
 191   if ( GetHWND() )
 192     ShowWindow((HWND) GetHWND(), SW_HIDE);
 193
 194   if ( (GetWindowStyleFlag() & wxDIALOG_MODAL) != wxDIALOG_MODAL )
 195     wxModelessWindows.DeleteObject(this);
 196
 197   UnsubclassWin();
 198
 199   // If this is the last top-level window, exit.
 200   if (wxTheApp && (wxTopLevelWindows.Number() == 0))
 201   {
 202     wxTheApp->SetTopWindow(NULL);
 203
 204     if (wxTheApp->GetExitOnFrameDelete())
 205     {
 206        PostQuitMessage(0);
 207     }
 208   }
 209 }
 210
 211 // By default, pressing escape cancels the dialog
 212 void wxDialog::OnCharHook(wxKeyEvent& event)
 213 {
 214   if (GetHWND())
 215   {
 216     if (event.m_keyCode == WXK_ESCAPE)
 217     {
 218         // Behaviour changed in 2.0: we'll send a Cancel message
 219         // to the dialog instead of Close.
 220         wxCommandEvent cancelEvent(wxEVT_COMMAND_BUTTON_CLICKED, wxID_CANCEL);
 221         cancelEvent.SetEventObject( this );
 222         GetEventHandler()->ProcessEvent(cancelEvent);
 223
 224         return;
 225     }
 226   }
 227   // We didn't process this event.
 228   event.Skip();
 229 }
 230
 231 void wxDialog::OnPaint(wxPaintEvent& event)
 232 {
 233   // No: if you call the default procedure, it makes
 234   // the following painting code not work.
 235 //  wxWindow::OnPaint(event);
 236 }
 237
 238 void wxDialog::Fit(void)
 239 {
 240   wxWindow::Fit();
 241 }
 242
 243 void wxDialog::Iconize(bool WXUNUSED(iconize))
 244 {
 245   // Windows dialog boxes can't be iconized
 246 }
 247
 248 bool wxDialog::IsIconized(void) const
 249 {
 250   return FALSE;
 251 }
 252
 253 void wxDialog::DoSetClientSize(int width, int height)
 254 {
 255   HWND hWnd = (HWND) GetHWND();
 256   RECT rect;
 257   ::GetClientRect(hWnd, &rect);
 258
 259   RECT rect2;
 260   GetWindowRect(hWnd, &rect2);
 261
 262   // Find the difference between the entire window (title bar and all)
 263   // and the client area; add this to the new client size to move the
 264   // window
 265   int actual_width = rect2.right - rect2.left - rect.right + width;
 266   int actual_height = rect2.bottom - rect2.top - rect.bottom + height;
 267
 268   MoveWindow(hWnd, rect2.left, rect2.top, actual_width, actual_height, TRUE);
 269
 270   wxSizeEvent event(wxSize(actual_width, actual_height), m_windowId);
 271   event.SetEventObject( this );
 272   GetEventHandler()->ProcessEvent(event);
 273 }
 274
 275 void wxDialog::GetPosition(int *x, int *y) const
 276 {
 277   HWND hWnd = (HWND) GetHWND();
 278   RECT rect;
 279   GetWindowRect(hWnd, &rect);
 280
 281   *x = rect.left;
 282   *y = rect.top;
 283 }
 284
 285 bool wxDialog::IsShown(void) const
 286 {
 287   return m_isShown;
 288 }
 289
 290 bool wxDialog::Show(bool show)
 291 {
 292   m_isShown = show;
 293
 294   if (show)
 295     InitDialog();
 296
 297   bool modal =  ((GetWindowStyleFlag() & wxDIALOG_MODAL) == wxDIALOG_MODAL) ;
 298
 299 #if WXGARBAGE_COLLECTION_ON /* MATTHEW: GC */
 300   if (!modal) {
 301     if (show) {
 302       if (!wxModelessWindows.Member(this))
 303   wxModelessWindows.Append(this);
 304     } else
 305       wxModelessWindows.DeleteObject(this);
 306   }
 307   if (show) {
 308     if (!wxTopLevelWindows.Member(this))
 309       wxTopLevelWindows.Append(this);
 310   } else
 311     wxTopLevelWindows.DeleteObject(this);
 312 #endif
 313
 314   if (modal)
 315   {
 316     if (show)
 317     {
 318       m_hwndOldFocus = (WXHWND)::GetFocus();
 319
 320       if (m_modalShowing)
 321       {
 322         BringWindowToTop((HWND) GetHWND());
 323         return TRUE;
 324       }
 325
 326       m_modalShowing = TRUE;
 327       wxNode *node = wxModalDialogs.First();
 328       while (node)
 329       {
 330         wxDialog *box = (wxDialog *)node->Data();
 331         if (box != this)
 332           ::EnableWindow((HWND) box->GetHWND(), FALSE);
 333         node = node->Next();
 334       }
 335
 336       // if we don't do it, some window might be deleted while we have pointers
 337       // to them in our disabledWindows list and the program will crash when it
 338       // will try to reenable them after the modal dialog end
 339       wxTheApp->DeletePendingObjects();
 340       wxList disabledWindows;
 341
 342       node = wxModelessWindows.First();
 343       while (node)
 344       {
 345         wxWindow *win = (wxWindow *)node->Data();
 346         if (::IsWindowEnabled((HWND) win->GetHWND()))
 347         {
 348           ::EnableWindow((HWND) win->GetHWND(), FALSE);
 349           disabledWindows.Append(win);
 350         }
 351         node = node->Next();
 352       }
 353
 354       ShowWindow((HWND) GetHWND(), SW_SHOW);
 355       EnableWindow((HWND) GetHWND(), TRUE);
 356       BringWindowToTop((HWND) GetHWND());
 357
 358       if (!wxModalDialogs.Member(this))
 359         wxModalDialogs.Append(this);
 360
 361       MSG msg;
 362       // Must test whether this dialog still exists: we may not process
 363       // a message before the deletion.
 364       while (wxModalDialogs.Member(this) && m_modalShowing && GetMessage(&msg, NULL, 0, 0))
 365       {
 366         if ( m_acceleratorTable.Ok() &&
 367              ::TranslateAccelerator((HWND)GetHWND(),
 368                                      (HACCEL)m_acceleratorTable.GetHACCEL(),
 369                                      &msg) )
 370         {
 371             // Have processed the message
 372         }
 373         else if ( !wxTheApp->ProcessMessage((WXMSG *)&msg) )
 374         {
 375           TranslateMessage(&msg);
 376           DispatchMessage(&msg);
 377         }
 378
 379         // If we get crashes (as per George Tasker's message) with nested modal dialogs,
 380         // we should try removing the m_modalShowing test
 381
 382         if (m_modalShowing && !::PeekMessage(&msg, 0, 0, 0, PM_NOREMOVE))
 383         // dfgg: NB MUST test m_modalShowing again as the message loop could have triggered
 384         //       a Show(FALSE) in the mean time!!!
 385         // Without the test, we might delete the dialog before the end of modal showing.
 386         {
 387                 while (wxTheApp->ProcessIdle() && m_modalShowing)
 388                 {
 389                     // Keep going until we decide we've done enough
 390                 }
 391          }
 392       }
 393       // dfgg: now must specifically re-enable all other app windows that we disabled earlier
 394       node=disabledWindows.First();
 395       while(node) {
 396         wxWindow* win = (wxWindow*) node->Data();
 397         if (wxModalDialogs.Member(win) || wxModelessWindows.Member(win))
 398         {
 399           HWND hWnd = (HWND) win->GetHWND();
 400           if (::IsWindow(hWnd))
 401             ::EnableWindow(hWnd,TRUE);
 402         }
 403         node=node->Next();
 404       }
 405     }
 406     else // !show
 407     {
 408       ::SetFocus((HWND)m_hwndOldFocus);
 409
 410       wxModalDialogs.DeleteObject(this);
 411
 412       wxNode *last = wxModalDialogs.Last();
 413
 414       // If there's still a modal dialog active, we
 415       // enable it, else we enable all modeless windows
 416       if (last)
 417       {
 418           // VZ: I don't understand what this is supposed to do, so I'll leave
 419           //     it out for now and look for horrible consequences
 420         wxDialog *box = (wxDialog *)last->Data();
 421         HWND hwnd = (HWND) box->GetHWND();
 422 #if 0
 423         if (box->IsUserEnabled())
 424 #endif // 0
 425           EnableWindow(hwnd, TRUE);
 426         BringWindowToTop(hwnd);
 427       }
 428       else
 429       {
 430         wxNode *node = wxModelessWindows.First();
 431         while (node)
 432         {
 433           wxWindow *win = (wxWindow *)node->Data();
 434           HWND hwnd = (HWND) win->GetHWND();
 435           // Only enable again if not user-disabled.
 436 #if 0
 437           if (win->IsUserEnabled())
 438 #endif // 0
 439             EnableWindow(hwnd, TRUE);
 440           node = node->Next();
 441         }
 442       }
 443       // Try to highlight the correct window (the parent)
 444       HWND hWndParent = 0;
 445       if (GetParent())
 446       {
 447         hWndParent = (HWND) GetParent()->GetHWND();
 448         if (hWndParent)
 449           ::BringWindowToTop(hWndParent);
 450       }
 451       ShowWindow((HWND) GetHWND(), SW_HIDE);
 452       m_modalShowing = FALSE;
 453     }
 454   }
 455   else // !modal
 456   {
 457     if (show)
 458     {
 459       ShowWindow((HWND) GetHWND(), SW_SHOW);
 460       BringWindowToTop((HWND) GetHWND());
 461     }
 462     else
 463     {
 464       // Try to highlight the correct window (the parent)
 465       HWND hWndParent = 0;
 466       if (GetParent())
 467       {
 468         hWndParent = (HWND) GetParent()->GetHWND();
 469         if (hWndParent)
 470           ::BringWindowToTop(hWndParent);
 471       }
 472       ShowWindow((HWND) GetHWND(), SW_HIDE);
 473     }
 474   }
 475   return TRUE;
 476 }
 477
 478 void wxDialog::SetTitle(const wxString& title)
 479 {
 480   SetWindowText((HWND) GetHWND(), (const char *)title);
 481 }
 482
 483 wxString wxDialog::GetTitle(void) const
 484 {
 485   GetWindowText((HWND) GetHWND(), wxBuffer, 1000);
 486   return wxString(wxBuffer);
 487 }
 488
 489 void wxDialog::Centre(int direction)
 490 {
 491   int x_offset,y_offset ;
 492   int display_width, display_height;
 493   int  width, height, x, y;
 494   wxWindow *parent = GetParent();
 495   if ((direction & wxCENTER_FRAME) && parent)
 496   {
 497       parent->GetPosition(&x_offset,&y_offset) ;
 498       parent->GetSize(&display_width,&display_height) ;
 499   }
 500   else
 501   {
 502     wxDisplaySize(&display_width, &display_height);
 503     x_offset = 0 ;
 504     y_offset = 0 ;
 505   }
 506
 507   GetSize(&width, &height);
 508   GetPosition(&x, &y);
 509
 510   if (direction & wxHORIZONTAL)
 511     x = (int)((display_width - width)/2);
 512   if (direction & wxVERTICAL)
 513     y = (int)((display_height - height)/2);
 514
 515   SetSize(x+x_offset, y+y_offset, width, height);
 516 }
 517
 518 // Replacement for Show(TRUE) for modal dialogs - returns return code
 519 int wxDialog::ShowModal(void)
 520 {
 521   m_windowStyle |= wxDIALOG_MODAL;
 522   Show(TRUE);
 523   return GetReturnCode();
 524 }
 525
 526 void wxDialog::EndModal(int retCode)
 527 {
 528   SetReturnCode(retCode);
 529   Show(FALSE);
 530 }
 531
 532 // Define for each class of dialog and control
 533 WXHBRUSH wxDialog::OnCtlColor(WXHDC pDC, WXHWND pWnd, WXUINT nCtlColor,
 534       WXUINT message, WXWPARAM wParam, WXLPARAM lParam)
 535 {
 536 #if wxUSE_CTL3D
 537   HBRUSH hbrush = Ctl3dCtlColorEx(message, wParam, lParam);
 538   return (WXHBRUSH) hbrush;
 539 #else
 540   return 0;
 541 #endif
 542 }
 543
 544 // Standard buttons
 545 void wxDialog::OnOK(wxCommandEvent& event)
 546 {
 547   if ( Validate() && TransferDataFromWindow() )
 548   {
 549         if ( IsModal() )
 550             EndModal(wxID_OK);
 551         else
 552         {
 553             SetReturnCode(wxID_OK);
 554             this->Show(FALSE);
 555         }
 556   }
 557 }
 558
 559 void wxDialog::OnApply(wxCommandEvent& event)
 560 {
 561   if (Validate())
 562     TransferDataFromWindow();
 563   // TODO probably need to disable the Apply button until things change again
 564 }
 565
 566 void wxDialog::OnCancel(wxCommandEvent& event)
 567 {
 568     if ( IsModal() )
 569         EndModal(wxID_CANCEL);
 570     else
 571     {
 572         SetReturnCode(wxID_CANCEL);
 573         this->Show(FALSE);
 574     }
 575 }
 576
 577 void wxDialog::OnCloseWindow(wxCloseEvent& event)
 578 {
 579     // We'll send a Cancel message by default,
 580     // which may close the dialog.
 581     // Check for looping if the Cancel event handler calls Close().
 582
 583     // Note that if a cancel button and handler aren't present in the dialog,
 584     // nothing will happen when you close the dialog via the window manager, or
 585     // via Close().
 586     // We wouldn't want to destroy the dialog by default, since the dialog may have been
 587     // created on the stack.
 588     // However, this does mean that calling dialog->Close() won't delete the dialog
 589     // unless the handler for wxID_CANCEL does so. So use Destroy() if you want to be
 590     // sure to destroy the dialog.
 591     // The default OnCancel (above) simply ends a modal dialog, and hides a modeless dialog.
 592
 593     static wxList closing;
 594
 595     if ( closing.Member(this) )
 596         return;
 597
 598     closing.Append(this);
 599
 600     wxCommandEvent cancelEvent(wxEVT_COMMAND_BUTTON_CLICKED, wxID_CANCEL);
 601     cancelEvent.SetEventObject( this );
 602     GetEventHandler()->ProcessEvent(cancelEvent); // This may close the dialog
 603
 604     closing.DeleteObject(this);
 605 }
 606
 607 // Destroy the window (delayed, if a managed window)
 608 bool wxDialog::Destroy(void)
 609 {
 610   if (!wxPendingDelete.Member(this))
 611     wxPendingDelete.Append(this);
 612   return TRUE;
 613 }
 614
 615 void wxDialog::OnSize(wxSizeEvent& WXUNUSED(event))
 616 {
 617   // if we're using constraints - do use them
 618   #if wxUSE_CONSTRAINTS
 619     if ( GetAutoLayout() ) {
 620       Layout();
 621     }
 622   #endif
 623 }
 624
 625 void wxDialog::OnSysColourChanged(wxSysColourChangedEvent& event)
 626 {
 627 #if wxUSE_CTL3D
 628   Ctl3dColorChange();
 629 #else
 630   SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE));
 631   Refresh();
 632 #endif
 633 }