src/common/wincmn.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        common/window.cpp
   3 // Purpose:     common (to all ports) wxWindow functions
   4 // Author:      Julian Smart, Vadim Zeitlin
   5 // Modified by:
   6 // Created:     13/07/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) wxWindows team
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21     #pragma implementation "windowbase.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/string.h"
  33     #include "wx/log.h"
  34     #include "wx/intl.h"
  35     #include "wx/frame.h"
  36     #include "wx/defs.h"
  37     #include "wx/window.h"
  38     #include "wx/checkbox.h"
  39     #include "wx/radiobut.h"
  40     #include "wx/settings.h"
  41     #include "wx/dialog.h"
  42 #endif //WX_PRECOMP
  43
  44 #if wxUSE_CONSTRAINTS
  45     #include "wx/layout.h"
  46 #endif // wxUSE_CONSTRAINTS
  47
  48 #if wxUSE_DRAG_AND_DROP
  49     #include "wx/dnd.h"
  50 #endif // wxUSE_DRAG_AND_DROP
  51
  52 #if wxUSE_TOOLTIPS
  53     #include "wx/tooltip.h"
  54 #endif // wxUSE_TOOLTIPS
  55
  56 #if wxUSE_CARET
  57     #include "wx/caret.h"
  58 #endif // wxUSE_CARET
  59
  60 // ----------------------------------------------------------------------------
  61 // static data
  62 // ----------------------------------------------------------------------------
  63
  64 int wxWindowBase::ms_lastControlId = -200;
  65
  66 IMPLEMENT_ABSTRACT_CLASS(wxWindowBase, wxEvtHandler)
  67
  68 // ----------------------------------------------------------------------------
  69 // event table
  70 // ----------------------------------------------------------------------------
  71
  72 BEGIN_EVENT_TABLE(wxWindowBase, wxEvtHandler)
  73     EVT_SYS_COLOUR_CHANGED(wxWindowBase::OnSysColourChanged)
  74     EVT_INIT_DIALOG(wxWindowBase::OnInitDialog)
  75 END_EVENT_TABLE()
  76
  77 // ============================================================================
  78 // implementation of the common functionality of the wxWindow class
  79 // ============================================================================
  80
  81 // ----------------------------------------------------------------------------
  82 // initialization
  83 // ----------------------------------------------------------------------------
  84
  85 // the default initialization
  86 void wxWindowBase::InitBase()
  87 {
  88     // no window yet, no parent nor children
  89     m_parent = (wxWindow *)NULL;
  90     m_windowId = -1;
  91     m_children.DeleteContents( FALSE ); // don't auto delete node data
  92
  93     // no constraints on the minimal window size
  94     m_minWidth =
  95     m_minHeight =
  96     m_maxWidth =
  97     m_maxHeight = -1;
  98
  99     // window is created enabled but it's not visible yet
 100     m_isShown = FALSE;
 101     m_isEnabled = TRUE;
 102
 103     // no client data
 104     m_clientObject = (wxClientData *)NULL;
 105     m_clientData = NULL;
 106
 107     // the default event handler is just this window
 108     m_eventHandler = this;
 109
 110     // no validator
 111     m_windowValidator = (wxValidator *) NULL;
 112
 113     // use the system default colours
 114     wxSystemSettings settings;
 115
 116     m_backgroundColour = settings.GetSystemColour(wxSYS_COLOUR_BTNFACE);
 117     m_foregroundColour = *wxBLACK;  // TODO take this from sys settings too?
 118     m_font = *wxSWISS_FONT;         //      and this?
 119
 120     // no style bits
 121     m_windowStyle = 0;
 122
 123     // an optimization for the event processing: checking this flag is much
 124     // faster than using IsKindOf(CLASSINFO(wxWindow))
 125     m_isWindow = TRUE;
 126
 127 #if wxUSE_CONSTRAINTS
 128     // no constraints whatsoever
 129     m_constraints = (wxLayoutConstraints *) NULL;
 130     m_constraintsInvolvedIn = (wxWindowList *) NULL;
 131     m_windowSizer = (wxSizer *) NULL;
 132     m_sizerParent = (wxWindowBase *) NULL;
 133     m_autoLayout = FALSE;
 134 #endif // wxUSE_CONSTRAINTS
 135
 136 #if wxUSE_DRAG_AND_DROP
 137     m_dropTarget = (wxDropTarget *)NULL;
 138 #endif // wxUSE_DRAG_AND_DROP
 139
 140 #if wxUSE_TOOLTIPS
 141     m_tooltip = (wxToolTip *)NULL;
 142 #endif // wxUSE_TOOLTIPS
 143
 144 #if wxUSE_CARET
 145     m_caret = (wxCaret *)NULL;
 146 #endif // wxUSE_CARET
 147 }
 148
 149 // common part of window creation process
 150 bool wxWindowBase::CreateBase(wxWindowBase *parent,
 151                               wxWindowID id,
 152                               const wxPoint& WXUNUSED(pos),
 153                               const wxSize& WXUNUSED(size),
 154                               long style,
 155                               const wxString& name)
 156 {
 157     // m_isWindow is set to TRUE in wxWindowBase::Init() as well as many other
 158     // member variables - check that it has been called (will catch the case
 159     // when a new ctor is added which doesn't call InitWindow)
 160     wxASSERT_MSG( m_isWindow, _T("Init() must have been called before!") );
 161
 162     // generate a new id if the user doesn't care about it
 163     m_windowId = id == -1 ? NewControlId() : id;
 164
 165     SetName(name);
 166     SetWindowStyleFlag(style);
 167     SetParent(parent);
 168
 169     return TRUE;
 170 }
 171
 172 // ----------------------------------------------------------------------------
 173 // destruction
 174 // ----------------------------------------------------------------------------
 175
 176 // common clean up
 177 wxWindowBase::~wxWindowBase()
 178 {
 179     // FIXME if these 2 cases result from programming errors in the user code
 180     //       we should probably assert here instead of silently fixing them
 181
 182     // Just in case the window has been Closed, but we're then deleting
 183     // immediately: don't leave dangling pointers.
 184     wxPendingDelete.DeleteObject(this);
 185
 186     // Just in case we've loaded a top-level window via LoadNativeDialog but
 187     // we weren't a dialog class
 188     wxTopLevelWindows.DeleteObject(this);
 189
 190     wxASSERT_MSG( GetChildren().GetCount() == 0, _T("children not destroyed") );
 191
 192 #if wxUSE_CARET
 193     if ( m_caret )
 194         delete m_caret;
 195 #endif // wxUSE_CARET
 196
 197     if ( m_windowValidator )
 198         delete m_windowValidator;
 199
 200     if ( m_clientObject )
 201         delete m_clientObject;
 202
 203 #if wxUSE_CONSTRAINTS
 204     // Have to delete constraints/sizer FIRST otherwise sizers may try to look
 205     // at deleted windows as they delete themselves.
 206     DeleteRelatedConstraints();
 207
 208     if ( m_constraints )
 209     {
 210         // This removes any dangling pointers to this window in other windows'
 211         // constraintsInvolvedIn lists.
 212         UnsetConstraints(m_constraints);
 213         delete m_constraints;
 214         m_constraints = NULL;
 215     }
 216
 217     if ( m_windowSizer )
 218         delete m_windowSizer;
 219
 220     // If this is a child of a sizer, remove self from parent
 221     if ( m_sizerParent )
 222         m_sizerParent->RemoveChild(this);
 223 #endif // wxUSE_CONSTRAINTS
 224
 225 #if wxUSE_DRAG_AND_DROP
 226     if ( m_dropTarget )
 227         delete m_dropTarget;
 228 #endif // wxUSE_DRAG_AND_DROP
 229
 230 #if wxUSE_TOOLTIPS
 231     if ( m_tooltip )
 232         delete m_tooltip;
 233 #endif // wxUSE_TOOLTIPS
 234 }
 235
 236 bool wxWindowBase::Destroy()
 237 {
 238     delete this;
 239
 240     return TRUE;
 241 }
 242
 243 bool wxWindowBase::Close(bool force)
 244 {
 245     wxCloseEvent event(wxEVT_CLOSE_WINDOW, m_windowId);
 246     event.SetEventObject(this);
 247 #if WXWIN_COMPATIBILITY
 248     event.SetForce(force);
 249 #endif // WXWIN_COMPATIBILITY
 250     event.SetCanVeto(!force);
 251
 252     // return FALSE if window wasn't closed because the application vetoed the
 253     // close event
 254     return GetEventHandler()->ProcessEvent(event) && !event.GetVeto();
 255 }
 256
 257 bool wxWindowBase::DestroyChildren()
 258 {
 259     wxWindowList::Node *node;
 260     for ( ;; )
 261     {
 262         // we iterate until the list becomes empty
 263         node = GetChildren().GetFirst();
 264         if ( !node )
 265             break;
 266
 267         wxWindow *child = node->GetData();
 268
 269         wxASSERT_MSG( child, _T("children list contains empty nodes") );
 270
 271         delete child;
 272
 273         wxASSERT_MSG( !GetChildren().Find(child),
 274                       _T("child didn't remove itself using RemoveChild()") );
 275     }
 276
 277     return TRUE;
 278 }
 279
 280 // ----------------------------------------------------------------------------
 281 // centre/fit the window
 282 // ----------------------------------------------------------------------------
 283
 284 // centre the window with respect to its parent in either (or both) directions
 285 void wxWindowBase::Centre(int direction)
 286 {
 287     int widthParent, heightParent;
 288
 289     wxWindow *parent = GetParent();
 290     if ( parent )
 291     {
 292         parent->GetClientSize(&widthParent, &heightParent);
 293     }
 294     else
 295     {
 296         // centre with respect to the whole screen
 297         wxDisplaySize(&widthParent, &heightParent);
 298     }
 299
 300     int width, height;
 301     GetSize(&width, &height);
 302
 303     int new_x = -1,
 304         new_y = -1;
 305
 306     if ( direction & wxHORIZONTAL )
 307         new_x = (widthParent - width)/2;
 308
 309     if ( direction & wxVERTICAL )
 310         new_y = (heightParent - height)/2;
 311
 312     Move(new_x, new_y);
 313 }
 314
 315 // fits the window around the children
 316 void wxWindowBase::Fit()
 317 {
 318     int maxX = 0,
 319         maxY = 0;
 320
 321     wxWindowList::Node *node = GetChildren().GetFirst();
 322     while ( node )
 323     {
 324         wxWindow *win = node->GetData();
 325         if ( win->IsKindOf(CLASSINFO(wxFrame)) ||
 326              win->IsKindOf(CLASSINFO(wxDialog)) )
 327         {
 328             // dialogs and frames line in different top level windows - don't
 329             // deal with them here
 330             continue;
 331         }
 332
 333         int wx, wy, ww, wh;
 334         win->GetPosition(&wx, &wy);
 335         win->GetSize(&ww, &wh);
 336         if ( wx + ww > maxX )
 337             maxX = wx + ww;
 338         if ( wy + wh > maxY )
 339             maxY = wy + wh;
 340
 341         node = node->GetNext();
 342     }
 343
 344     // leave a margin
 345     SetClientSize(maxX + 7, maxY + 14);
 346 }
 347
 348 // set the min/max size of the window
 349
 350 void wxWindowBase::SetSizeHints(int minW, int minH,
 351                                 int maxW, int maxH,
 352                                 int WXUNUSED(incW), int WXUNUSED(incH))
 353 {
 354     m_minWidth = minW;
 355     m_maxWidth = maxW;
 356     m_minHeight = minH;
 357     m_maxHeight = maxH;
 358 }
 359
 360 // ----------------------------------------------------------------------------
 361 // show/hide/enable/disable the window
 362 // ----------------------------------------------------------------------------
 363
 364 bool wxWindowBase::Show(bool show)
 365 {
 366     if ( show != m_isShown )
 367     {
 368         m_isShown = show;
 369
 370         return TRUE;
 371     }
 372     else
 373     {
 374         return FALSE;
 375     }
 376 }
 377
 378 bool wxWindowBase::Enable(bool enable)
 379 {
 380     if ( enable != m_isEnabled )
 381     {
 382         m_isEnabled = enable;
 383
 384         return TRUE;
 385     }
 386     else
 387     {
 388         return FALSE;
 389     }
 390 }
 391
 392 // ----------------------------------------------------------------------------
 393 // reparenting the window
 394 // ----------------------------------------------------------------------------
 395
 396 void wxWindowBase::AddChild(wxWindowBase *child)
 397 {
 398     wxCHECK_RET( child, _T("can't add a NULL child") );
 399
 400     GetChildren().Append(child);
 401     child->SetParent(this);
 402 }
 403
 404 void wxWindowBase::RemoveChild(wxWindowBase *child)
 405 {
 406     wxCHECK_RET( child, _T("can't remove a NULL child") );
 407
 408     GetChildren().DeleteObject(child);
 409     child->SetParent((wxWindow *)NULL);
 410 }
 411
 412 bool wxWindowBase::Reparent(wxWindowBase *newParent)
 413 {
 414     wxWindow *oldParent = GetParent();
 415     if ( newParent == oldParent )
 416     {
 417         // nothing done
 418         return FALSE;
 419     }
 420
 421     // unlink this window from the existing parent.
 422     if ( oldParent )
 423     {
 424         oldParent->RemoveChild(this);
 425     }
 426     else
 427     {
 428         wxTopLevelWindows.DeleteObject(this);
 429     }
 430
 431     // add it to the new one
 432     if ( newParent )
 433     {
 434         newParent->AddChild(this);
 435     }
 436     else
 437     {
 438         wxTopLevelWindows.Append(this);
 439     }
 440
 441     return TRUE;
 442 }
 443
 444 // ----------------------------------------------------------------------------
 445 // event handler stuff
 446 // ----------------------------------------------------------------------------
 447
 448 void wxWindowBase::PushEventHandler(wxEvtHandler *handler)
 449 {
 450     handler->SetNextHandler(GetEventHandler());
 451     SetEventHandler(handler);
 452 }
 453
 454 wxEvtHandler *wxWindowBase::PopEventHandler(bool deleteHandler)
 455 {
 456     wxEvtHandler *handlerA = GetEventHandler();
 457     if ( handlerA )
 458     {
 459         wxEvtHandler *handlerB = handlerA->GetNextHandler();
 460         handlerA->SetNextHandler((wxEvtHandler *)NULL);
 461         SetEventHandler(handlerB);
 462         if ( deleteHandler )
 463         {
 464             delete handlerA;
 465             handlerA = (wxEvtHandler *)NULL;
 466         }
 467     }
 468
 469     return handlerA;
 470 }
 471
 472 // ----------------------------------------------------------------------------
 473 // cursors, fonts &c
 474 // ----------------------------------------------------------------------------
 475
 476 bool wxWindowBase::SetBackgroundColour( const wxColour &colour )
 477 {
 478     if ( !colour.Ok() || (colour == m_backgroundColour) )
 479         return FALSE;
 480
 481     m_backgroundColour = colour;
 482
 483     return TRUE;
 484 }
 485
 486 bool wxWindowBase::SetForegroundColour( const wxColour &colour )
 487 {
 488     if ( !colour.Ok() || (colour == m_foregroundColour) )
 489         return FALSE;
 490
 491     m_foregroundColour = colour;
 492
 493     return TRUE;
 494 }
 495
 496 bool wxWindowBase::SetCursor(const wxCursor& cursor)
 497 {
 498     // don't try to set invalid cursor, always fall back to the default
 499     const wxCursor& cursorOk = cursor.Ok() ? cursor : *wxSTANDARD_CURSOR;
 500
 501     if ( cursorOk == m_cursor )
 502     {
 503         // no change
 504         return FALSE;
 505     }
 506
 507     m_cursor = cursorOk;
 508
 509     return TRUE;
 510 }
 511
 512 bool wxWindowBase::SetFont(const wxFont& font)
 513 {
 514     // don't try to set invalid font, always fall back to the default
 515     const wxFont& fontOk = font.Ok() ? font : *wxSWISS_FONT;
 516
 517     if ( fontOk == m_font )
 518     {
 519         // no change
 520         return FALSE;
 521     }
 522
 523     m_font = fontOk;
 524
 525     return TRUE;
 526 }
 527
 528 #if wxUSE_CARET
 529 void wxWindowBase::SetCaret(wxCaret *caret)
 530 {
 531     if ( m_caret )
 532     {
 533         delete m_caret;
 534     }
 535
 536     m_caret = caret;
 537
 538     if ( m_caret )
 539     {
 540         wxASSERT_MSG( m_caret->GetWindow() == this,
 541                       "caret should be created associated to this window" );
 542     }
 543 }
 544 #endif // wxUSE_CARET
 545
 546 // ----------------------------------------------------------------------------
 547 // validators
 548 // ----------------------------------------------------------------------------
 549
 550 void wxWindowBase::SetValidator(const wxValidator& validator)
 551 {
 552     if ( m_windowValidator )
 553         delete m_windowValidator;
 554
 555     m_windowValidator = (wxValidator *)validator.Clone();
 556
 557     if ( m_windowValidator )
 558         m_windowValidator->SetWindow(this) ;
 559 }
 560
 561 // ----------------------------------------------------------------------------
 562 // update region testing
 563 // ----------------------------------------------------------------------------
 564
 565 bool wxWindowBase::IsExposed(int x, int y) const
 566 {
 567     return m_updateRegion.Contains(x, y) != wxOutRegion;
 568 }
 569
 570 bool wxWindowBase::IsExposed(int x, int y, int w, int h) const
 571 {
 572     return m_updateRegion.Contains(x, y, w, h) != wxOutRegion;
 573 }
 574
 575 // ----------------------------------------------------------------------------
 576 // find window by id or name
 577 // ----------------------------------------------------------------------------
 578
 579 wxWindow *wxWindowBase::FindWindow( long id )
 580 {
 581     if ( id == m_windowId )
 582         return (wxWindow *)this;
 583
 584     wxWindowBase *res = (wxWindow *)NULL;
 585     wxWindowList::Node *node;
 586     for ( node = m_children.GetFirst(); node && !res; node = node->GetNext() )
 587     {
 588         wxWindowBase *child = node->GetData();
 589         res = child->FindWindow( id );
 590     }
 591
 592     return (wxWindow *)res;
 593 }
 594
 595 wxWindow *wxWindowBase::FindWindow( const wxString& name )
 596 {
 597     if ( name == m_windowName )
 598         return (wxWindow *)this;
 599
 600     wxWindowBase *res = (wxWindow *)NULL;
 601     wxWindowList::Node *node;
 602     for ( node = m_children.GetFirst(); node && !res; node = node->GetNext() )
 603     {
 604         wxWindow *child = node->GetData();
 605         res = child->FindWindow(name);
 606     }
 607
 608     return (wxWindow *)res;
 609 }
 610
 611 // ----------------------------------------------------------------------------
 612 // dialog oriented functions
 613 // ----------------------------------------------------------------------------
 614
 615 void wxWindowBase::MakeModal(bool WXUNUSED(modal))
 616 {
 617     wxFAIL_MSG(_T("TODO"));
 618 }
 619
 620 bool wxWindowBase::Validate()
 621 {
 622     wxWindowList::Node *node;
 623     for ( node = m_children.GetFirst(); node; node = node->GetNext() )
 624     {
 625         wxWindowBase *child = node->GetData();
 626         wxValidator *validator = child->GetValidator();
 627         if ( validator && validator->Validate((wxWindow *)this) )
 628         {
 629             return FALSE;
 630         }
 631     }
 632
 633     return TRUE;
 634 }
 635
 636 bool wxWindowBase::TransferDataToWindow()
 637 {
 638     wxWindowList::Node *node;
 639     for ( node = m_children.GetFirst(); node; node = node->GetNext() )
 640     {
 641         wxWindowBase *child = node->GetData();
 642         wxValidator *validator = child->GetValidator();
 643         if ( validator && !validator->TransferToWindow() )
 644         {
 645             wxLog *log = wxLog::GetActiveTarget();
 646             if ( log )
 647             {
 648                 wxLogWarning(_("Could not transfer data to window"));
 649                 log->Flush();
 650             }
 651
 652             return FALSE;
 653         }
 654     }
 655
 656     return TRUE;
 657 }
 658
 659 bool wxWindowBase::TransferDataFromWindow()
 660 {
 661     wxWindowList::Node *node;
 662     for ( node = m_children.GetFirst(); node; node = node->GetNext() )
 663     {
 664         wxWindow *child = node->GetData();
 665         if ( child->GetValidator() &&
 666              !child->GetValidator()->TransferFromWindow() )
 667         {
 668             return FALSE;
 669         }
 670     }
 671
 672     return TRUE;
 673 }
 674
 675 void wxWindowBase::InitDialog()
 676 {
 677     wxInitDialogEvent event(GetId());
 678     event.SetEventObject( this );
 679     GetEventHandler()->ProcessEvent(event);
 680 }
 681
 682 // ----------------------------------------------------------------------------
 683 // tooltips
 684 // ----------------------------------------------------------------------------
 685
 686 #if wxUSE_TOOLTIPS
 687
 688 void wxWindowBase::SetToolTip( const wxString &tip )
 689 {
 690     // don't create the new tooltip if we already have one
 691     if ( m_tooltip )
 692     {
 693         m_tooltip->SetTip( tip );
 694     }
 695     else
 696     {
 697         SetToolTip( new wxToolTip( tip ) );
 698     }
 699
 700     // setting empty tooltip text does not remove the tooltip any more - use
 701     // SetToolTip((wxToolTip *)NULL) for this
 702 }
 703
 704 void wxWindowBase::DoSetToolTip(wxToolTip *tooltip)
 705 {
 706     if ( m_tooltip )
 707         delete m_tooltip;
 708
 709     m_tooltip = tooltip;
 710 }
 711
 712 #endif // wxUSE_TOOLTIPS
 713
 714 // ----------------------------------------------------------------------------
 715 // constraints and sizers
 716 // ----------------------------------------------------------------------------
 717
 718 #if wxUSE_CONSTRAINTS
 719
 720 void wxWindowBase::SetConstraints( wxLayoutConstraints *constraints )
 721 {
 722     if ( m_constraints )
 723     {
 724         UnsetConstraints(m_constraints);
 725         delete m_constraints;
 726     }
 727     m_constraints = constraints;
 728     if ( m_constraints )
 729     {
 730         // Make sure other windows know they're part of a 'meaningful relationship'
 731         if ( m_constraints->left.GetOtherWindow() && (m_constraints->left.GetOtherWindow() != this) )
 732             m_constraints->left.GetOtherWindow()->AddConstraintReference(this);
 733         if ( m_constraints->top.GetOtherWindow() && (m_constraints->top.GetOtherWindow() != this) )
 734             m_constraints->top.GetOtherWindow()->AddConstraintReference(this);
 735         if ( m_constraints->right.GetOtherWindow() && (m_constraints->right.GetOtherWindow() != this) )
 736             m_constraints->right.GetOtherWindow()->AddConstraintReference(this);
 737         if ( m_constraints->bottom.GetOtherWindow() && (m_constraints->bottom.GetOtherWindow() != this) )
 738             m_constraints->bottom.GetOtherWindow()->AddConstraintReference(this);
 739         if ( m_constraints->width.GetOtherWindow() && (m_constraints->width.GetOtherWindow() != this) )
 740             m_constraints->width.GetOtherWindow()->AddConstraintReference(this);
 741         if ( m_constraints->height.GetOtherWindow() && (m_constraints->height.GetOtherWindow() != this) )
 742             m_constraints->height.GetOtherWindow()->AddConstraintReference(this);
 743         if ( m_constraints->centreX.GetOtherWindow() && (m_constraints->centreX.GetOtherWindow() != this) )
 744             m_constraints->centreX.GetOtherWindow()->AddConstraintReference(this);
 745         if ( m_constraints->centreY.GetOtherWindow() && (m_constraints->centreY.GetOtherWindow() != this) )
 746             m_constraints->centreY.GetOtherWindow()->AddConstraintReference(this);
 747     }
 748 }
 749
 750 // This removes any dangling pointers to this window in other windows'
 751 // constraintsInvolvedIn lists.
 752 void wxWindowBase::UnsetConstraints(wxLayoutConstraints *c)
 753 {
 754     if ( c )
 755     {
 756         if ( c->left.GetOtherWindow() && (c->top.GetOtherWindow() != this) )
 757             c->left.GetOtherWindow()->RemoveConstraintReference(this);
 758         if ( c->top.GetOtherWindow() && (c->top.GetOtherWindow() != this) )
 759             c->top.GetOtherWindow()->RemoveConstraintReference(this);
 760         if ( c->right.GetOtherWindow() && (c->right.GetOtherWindow() != this) )
 761             c->right.GetOtherWindow()->RemoveConstraintReference(this);
 762         if ( c->bottom.GetOtherWindow() && (c->bottom.GetOtherWindow() != this) )
 763             c->bottom.GetOtherWindow()->RemoveConstraintReference(this);
 764         if ( c->width.GetOtherWindow() && (c->width.GetOtherWindow() != this) )
 765             c->width.GetOtherWindow()->RemoveConstraintReference(this);
 766         if ( c->height.GetOtherWindow() && (c->height.GetOtherWindow() != this) )
 767             c->height.GetOtherWindow()->RemoveConstraintReference(this);
 768         if ( c->centreX.GetOtherWindow() && (c->centreX.GetOtherWindow() != this) )
 769             c->centreX.GetOtherWindow()->RemoveConstraintReference(this);
 770         if ( c->centreY.GetOtherWindow() && (c->centreY.GetOtherWindow() != this) )
 771             c->centreY.GetOtherWindow()->RemoveConstraintReference(this);
 772     }
 773 }
 774
 775 // Back-pointer to other windows we're involved with, so if we delete this
 776 // window, we must delete any constraints we're involved with.
 777 void wxWindowBase::AddConstraintReference(wxWindowBase *otherWin)
 778 {
 779     if ( !m_constraintsInvolvedIn )
 780         m_constraintsInvolvedIn = new wxWindowList;
 781     if ( !m_constraintsInvolvedIn->Find(otherWin) )
 782         m_constraintsInvolvedIn->Append(otherWin);
 783 }
 784
 785 // REMOVE back-pointer to other windows we're involved with.
 786 void wxWindowBase::RemoveConstraintReference(wxWindowBase *otherWin)
 787 {
 788     if ( m_constraintsInvolvedIn )
 789         m_constraintsInvolvedIn->DeleteObject(otherWin);
 790 }
 791
 792 // Reset any constraints that mention this window
 793 void wxWindowBase::DeleteRelatedConstraints()
 794 {
 795     if ( m_constraintsInvolvedIn )
 796     {
 797         wxWindowList::Node *node = m_constraintsInvolvedIn->GetFirst();
 798         while (node)
 799         {
 800             wxWindow *win = node->GetData();
 801             wxLayoutConstraints *constr = win->GetConstraints();
 802
 803             // Reset any constraints involving this window
 804             if ( constr )
 805             {
 806                 constr->left.ResetIfWin(this);
 807                 constr->top.ResetIfWin(this);
 808                 constr->right.ResetIfWin(this);
 809                 constr->bottom.ResetIfWin(this);
 810                 constr->width.ResetIfWin(this);
 811                 constr->height.ResetIfWin(this);
 812                 constr->centreX.ResetIfWin(this);
 813                 constr->centreY.ResetIfWin(this);
 814             }
 815
 816             wxWindowList::Node *next = node->GetNext();
 817             delete node;
 818             node = next;
 819         }
 820
 821         delete m_constraintsInvolvedIn;
 822         m_constraintsInvolvedIn = (wxWindowList *) NULL;
 823     }
 824 }
 825
 826 void wxWindowBase::SetSizer(wxSizer *sizer)
 827 {
 828     m_windowSizer = sizer;
 829     if ( sizer )
 830         sizer->SetSizerParent(this);
 831 }
 832
 833 bool wxWindowBase::Layout()
 834 {
 835     if ( GetConstraints() )
 836     {
 837         int w, h;
 838         GetClientSize(&w, &h);
 839         GetConstraints()->width.SetValue(w);
 840         GetConstraints()->height.SetValue(h);
 841     }
 842
 843     // If top level (one sizer), evaluate the sizer's constraints.
 844     if ( GetSizer() )
 845     {
 846         int noChanges;
 847         GetSizer()->ResetConstraints();   // Mark all constraints as unevaluated
 848         GetSizer()->LayoutPhase1(&noChanges);
 849         GetSizer()->LayoutPhase2(&noChanges);
 850         GetSizer()->SetConstraintSizes(); // Recursively set the real window sizes
 851         return TRUE;
 852     }
 853     else
 854     {
 855         // Otherwise, evaluate child constraints
 856         ResetConstraints();   // Mark all constraints as unevaluated
 857         DoPhase(1);           // Just one phase need if no sizers involved
 858         DoPhase(2);
 859         SetConstraintSizes(); // Recursively set the real window sizes
 860     }
 861     return TRUE;
 862 }
 863
 864
 865 // Do a phase of evaluating constraints: the default behaviour. wxSizers may
 866 // do a similar thing, but also impose their own 'constraints' and order the
 867 // evaluation differently.
 868 bool wxWindowBase::LayoutPhase1(int *noChanges)
 869 {
 870     wxLayoutConstraints *constr = GetConstraints();
 871     if ( constr )
 872     {
 873         return constr->SatisfyConstraints(this, noChanges);
 874     }
 875     else
 876         return TRUE;
 877 }
 878
 879 bool wxWindowBase::LayoutPhase2(int *noChanges)
 880 {
 881     *noChanges = 0;
 882
 883     // Layout children
 884     DoPhase(1);
 885     DoPhase(2);
 886     return TRUE;
 887 }
 888
 889 // Do a phase of evaluating child constraints
 890 bool wxWindowBase::DoPhase(int phase)
 891 {
 892     int noIterations = 0;
 893     int maxIterations = 500;
 894     int noChanges = 1;
 895     int noFailures = 0;
 896     wxWindowList succeeded;
 897     while ((noChanges > 0) && (noIterations < maxIterations))
 898     {
 899         noChanges = 0;
 900         noFailures = 0;
 901         wxWindowList::Node *node = GetChildren().GetFirst();
 902         while (node)
 903         {
 904             wxWindow *child = node->GetData();
 905             if ( !child->IsKindOf(CLASSINFO(wxFrame)) && !child->IsKindOf(CLASSINFO(wxDialog)) )
 906             {
 907                 wxLayoutConstraints *constr = child->GetConstraints();
 908                 if ( constr )
 909                 {
 910                     if ( !succeeded.Find(child) )
 911                     {
 912                         int tempNoChanges = 0;
 913                         bool success = ( (phase == 1) ? child->LayoutPhase1(&tempNoChanges) : child->LayoutPhase2(&tempNoChanges) ) ;
 914                         noChanges += tempNoChanges;
 915                         if ( success )
 916                         {
 917                             succeeded.Append(child);
 918                         }
 919                     }
 920                 }
 921             }
 922             node = node->GetNext();
 923         }
 924
 925         noIterations++;
 926     }
 927
 928     return TRUE;
 929 }
 930
 931 void wxWindowBase::ResetConstraints()
 932 {
 933     wxLayoutConstraints *constr = GetConstraints();
 934     if ( constr )
 935     {
 936         constr->left.SetDone(FALSE);
 937         constr->top.SetDone(FALSE);
 938         constr->right.SetDone(FALSE);
 939         constr->bottom.SetDone(FALSE);
 940         constr->width.SetDone(FALSE);
 941         constr->height.SetDone(FALSE);
 942         constr->centreX.SetDone(FALSE);
 943         constr->centreY.SetDone(FALSE);
 944     }
 945     wxWindowList::Node *node = GetChildren().GetFirst();
 946     while (node)
 947     {
 948         wxWindow *win = node->GetData();
 949         if ( !win->IsKindOf(CLASSINFO(wxFrame)) && !win->IsKindOf(CLASSINFO(wxDialog)) )
 950             win->ResetConstraints();
 951         node = node->GetNext();
 952     }
 953 }
 954
 955 // Need to distinguish between setting the 'fake' size for windows and sizers,
 956 // and setting the real values.
 957 void wxWindowBase::SetConstraintSizes(bool recurse)
 958 {
 959     wxLayoutConstraints *constr = GetConstraints();
 960     if ( constr && constr->left.GetDone() && constr->right.GetDone( ) &&
 961             constr->width.GetDone() && constr->height.GetDone())
 962     {
 963         int x = constr->left.GetValue();
 964         int y = constr->top.GetValue();
 965         int w = constr->width.GetValue();
 966         int h = constr->height.GetValue();
 967
 968         // If we don't want to resize this window, just move it...
 969         if ( (constr->width.GetRelationship() != wxAsIs ) ||
 970                 (constr->height.GetRelationship() != wxAsIs))
 971         {
 972             // Calls Layout() recursively. AAAGH. How can we stop that.
 973             // Simply take Layout() out of non-top level OnSizes.
 974             SizerSetSize(x, y, w, h);
 975         }
 976         else
 977         {
 978             SizerMove(x, y);
 979         }
 980     }
 981     else if ( constr )
 982     {
 983         wxChar *windowClass = GetClassInfo()->GetClassName();
 984
 985         wxString winName;
 986         if ( GetName() == _T("") )
 987             winName = _T("unnamed");
 988         else
 989             winName = GetName();
 990         wxLogDebug( _T("Constraint(s) not satisfied for window of type %s, name %s:\n"),
 991                 (const wxChar *)windowClass,
 992                 (const wxChar *)winName);
 993         if ( !constr->left.GetDone()) wxLogDebug( _T("  unsatisfied 'left' constraint.\n")  );
 994         if ( !constr->right.GetDone()) wxLogDebug( _T("  unsatisfied 'right' constraint.\n")  );
 995         if ( !constr->width.GetDone()) wxLogDebug( _T("  unsatisfied 'width' constraint.\n")  );
 996         if ( !constr->height.GetDone())  wxLogDebug( _T("  unsatisfied 'height' constraint.\n")  );
 997         wxLogDebug( _T("Please check constraints: try adding AsIs() constraints.\n") );
 998     }
 999
1000     if ( recurse )
1001     {
1002         wxWindowList::Node *node = GetChildren().GetFirst();
1003         while (node)
1004         {
1005             wxWindow *win = node->GetData();
1006             if ( !win->IsKindOf(CLASSINFO(wxFrame)) && !win->IsKindOf(CLASSINFO(wxDialog)) )
1007                 win->SetConstraintSizes();
1008             node = node->GetNext();
1009         }
1010     }
1011 }
1012
1013 // This assumes that all sizers are 'on' the same window, i.e. the parent of
1014 // this window.
1015 void wxWindowBase::TransformSizerToActual(int *x, int *y) const
1016 {
1017     if ( !m_sizerParent || m_sizerParent->IsKindOf(CLASSINFO(wxDialog) ) ||
1018             m_sizerParent->IsKindOf(CLASSINFO(wxFrame)) )
1019         return;
1020
1021     int xp, yp;
1022     m_sizerParent->GetPosition(&xp, &yp);
1023     m_sizerParent->TransformSizerToActual(&xp, &yp);
1024     *x += xp;
1025     *y += yp;
1026 }
1027
1028 void wxWindowBase::SizerSetSize(int x, int y, int w, int h)
1029 {
1030     int xx = x;
1031     int yy = y;
1032     TransformSizerToActual(&xx, &yy);
1033     SetSize(xx, yy, w, h);
1034 }
1035
1036 void wxWindowBase::SizerMove(int x, int y)
1037 {
1038     int xx = x;
1039     int yy = y;
1040     TransformSizerToActual(&xx, &yy);
1041     Move(xx, yy);
1042 }
1043
1044 // Only set the size/position of the constraint (if any)
1045 void wxWindowBase::SetSizeConstraint(int x, int y, int w, int h)
1046 {
1047     wxLayoutConstraints *constr = GetConstraints();
1048     if ( constr )
1049     {
1050         if ( x != -1 )
1051         {
1052             constr->left.SetValue(x);
1053             constr->left.SetDone(TRUE);
1054         }
1055         if ( y != -1 )
1056         {
1057             constr->top.SetValue(y);
1058             constr->top.SetDone(TRUE);
1059         }
1060         if ( w != -1 )
1061         {
1062             constr->width.SetValue(w);
1063             constr->width.SetDone(TRUE);
1064         }
1065         if ( h != -1 )
1066         {
1067             constr->height.SetValue(h);
1068             constr->height.SetDone(TRUE);
1069         }
1070     }
1071 }
1072
1073 void wxWindowBase::MoveConstraint(int x, int y)
1074 {
1075     wxLayoutConstraints *constr = GetConstraints();
1076     if ( constr )
1077     {
1078         if ( x != -1 )
1079         {
1080             constr->left.SetValue(x);
1081             constr->left.SetDone(TRUE);
1082         }
1083         if ( y != -1 )
1084         {
1085             constr->top.SetValue(y);
1086             constr->top.SetDone(TRUE);
1087         }
1088     }
1089 }
1090
1091 void wxWindowBase::GetSizeConstraint(int *w, int *h) const
1092 {
1093     wxLayoutConstraints *constr = GetConstraints();
1094     if ( constr )
1095     {
1096         *w = constr->width.GetValue();
1097         *h = constr->height.GetValue();
1098     }
1099     else
1100         GetSize(w, h);
1101 }
1102
1103 void wxWindowBase::GetClientSizeConstraint(int *w, int *h) const
1104 {
1105     wxLayoutConstraints *constr = GetConstraints();
1106     if ( constr )
1107     {
1108         *w = constr->width.GetValue();
1109         *h = constr->height.GetValue();
1110     }
1111     else
1112         GetClientSize(w, h);
1113 }
1114
1115 void wxWindowBase::GetPositionConstraint(int *x, int *y) const
1116 {
1117     wxLayoutConstraints *constr = GetConstraints();
1118     if ( constr )
1119     {
1120         *x = constr->left.GetValue();
1121         *y = constr->top.GetValue();
1122     }
1123     else
1124         GetPosition(x, y);
1125 }
1126
1127 #endif // wxUSE_CONSTRAINTS
1128
1129 // ----------------------------------------------------------------------------
1130 // do Update UI processing for child controls
1131 // ----------------------------------------------------------------------------
1132
1133 // TODO: should this be implemented for the child window rather
1134 // than the parent? Then you can override it e.g. for wxCheckBox
1135 // to do the Right Thing rather than having to assume a fixed number
1136 // of control classes.
1137 void wxWindowBase::UpdateWindowUI()
1138 {
1139     wxWindowID id = GetId();
1140     if ( id > 0 )
1141     {
1142         wxUpdateUIEvent event(id);
1143         event.m_eventObject = this;
1144
1145         if ( GetEventHandler()->ProcessEvent(event) )
1146         {
1147             if ( event.GetSetEnabled() )
1148                 Enable(event.GetEnabled());
1149
1150             if ( event.GetSetText() && IsKindOf(CLASSINFO(wxControl)) )
1151                 ((wxControl*)this)->SetLabel(event.GetText());
1152
1153             if ( IsKindOf(CLASSINFO(wxCheckBox)) )
1154             {
1155                 if ( event.GetSetChecked() )
1156                     ((wxCheckBox *)this)->SetValue(event.GetChecked());
1157             }
1158             else if ( IsKindOf(CLASSINFO(wxRadioButton)) )
1159             {
1160                 if ( event.GetSetChecked() )
1161                     ((wxRadioButton *) this)->SetValue(event.GetChecked());
1162             }
1163         }
1164     }
1165 }
1166
1167 // ----------------------------------------------------------------------------
1168 // dialog units translations
1169 // ----------------------------------------------------------------------------
1170
1171 wxPoint wxWindowBase::ConvertPixelsToDialog(const wxPoint& pt)
1172 {
1173     int charWidth = GetCharWidth();
1174     int charHeight = GetCharHeight();
1175     wxPoint pt2;
1176     pt2.x = (int) ((pt.x * 4) / charWidth) ;
1177     pt2.y = (int) ((pt.y * 8) / charHeight) ;
1178
1179     return pt2;
1180 }
1181
1182 wxPoint wxWindowBase::ConvertDialogToPixels(const wxPoint& pt)
1183 {
1184     int charWidth = GetCharWidth();
1185     int charHeight = GetCharHeight();
1186     wxPoint pt2;
1187     pt2.x = (int) ((pt.x * charWidth) / 4) ;
1188     pt2.y = (int) ((pt.y * charHeight) / 8) ;
1189
1190     return pt2;
1191 }
1192
1193 // ----------------------------------------------------------------------------
1194 // event handlers
1195 // ----------------------------------------------------------------------------
1196
1197 // propagate the colour change event to the subwindows
1198 void wxWindowBase::OnSysColourChanged(wxSysColourChangedEvent& event)
1199 {
1200     wxWindowList::Node *node = GetChildren().GetFirst();
1201     while ( node )
1202     {
1203         // Only propagate to non-top-level windows
1204         wxWindow *win = node->GetData();
1205         if ( !win->IsTopLevel() )
1206         {
1207             wxSysColourChangedEvent event2;
1208             event.m_eventObject = win;
1209             win->GetEventHandler()->ProcessEvent(event2);
1210         }
1211
1212         node = node->GetNext();
1213     }
1214 }
1215
1216 // the default action is to populate dialog with data when it's created
1217 void wxWindowBase::OnInitDialog( wxInitDialogEvent &WXUNUSED(event) )
1218 {
1219     TransferDataToWindow();
1220 }
1221
1222 // ----------------------------------------------------------------------------
1223 // list classes implementation
1224 // ----------------------------------------------------------------------------
1225
1226 void wxWindowListNode::DeleteData()
1227 {
1228     delete (wxWindow *)GetData();
1229 }
1230