src/common/layout.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        layout.cpp
   3 // Purpose:     Constraint layout system classes
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "layout.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 #include "wx/defs.h"
  24
  25 #if wxUSE_CONSTRAINTS
  26
  27 #ifndef WX_PRECOMP
  28 #include "wx/window.h"
  29 #include "wx/utils.h"
  30 #include "wx/dialog.h"
  31 #include "wx/msgdlg.h"
  32 #include <wx/intl.h>
  33 #endif
  34
  35 #include "wx/layout.h"
  36
  37 #if !USE_SHARED_LIBRARY
  38 IMPLEMENT_DYNAMIC_CLASS(wxIndividualLayoutConstraint, wxObject)
  39 IMPLEMENT_DYNAMIC_CLASS(wxLayoutConstraints, wxObject)
  40 IMPLEMENT_DYNAMIC_CLASS(wxSizer, wxObject)
  41 IMPLEMENT_DYNAMIC_CLASS(wxRowColSizer, wxSizer)
  42 IMPLEMENT_DYNAMIC_CLASS(wxSpacingSizer, wxSizer)
  43 #endif
  44
  45 /*
  46 TODO:
  47  - Non shrink-to-fit row-col behaviour.
  48  - Give justification styles, so can e.g. centre
  49  the rows & cols, distribute the available space...
  50  - Shrink-to-fit: should resize outer window (e.g. dialog box)
  51  if directly associated with this kind of window.
  52  - How to deal with a rowcol that stretches in one direction
  53  but shrinks-to-fit in other. E.g. a horizontal toolbar: the width
  54  stretches to fit the frame, but the height is constant
  55  or wraps around contents. The algorithm currently assumes
  56  both dimensions have the same behaviour. Could assume a constant
  57  height (absolute value).
  58  - rowcol where each row or column is aligned (length of
  59    largest element determines spacing)
  60  - Groupbox sizer
  61  - Analyze aesthetic dialog boxes and implement using sizers.
  62  - What reuseable components can we provide? E.g. Ok/Cancel/Help
  63    group of buttons.
  64  - use wxStaticItems for aesthetic dialogs.
  65
  66 */
  67
  68 // Find margin sizes if a sizer, or zero otherwise
  69 int wxSizerMarginX(wxWindow *win)
  70 {
  71         if ( win->IsKindOf(CLASSINFO(wxSizer)) )
  72         {
  73                 wxSizer *sizer = (wxSizer *)win;
  74                 return sizer->GetBorderX();
  75         }
  76         else
  77                 return 0;
  78 }
  79
  80 int wxSizerMarginY(wxWindow *win)
  81 {
  82         if ( win->IsKindOf(CLASSINFO(wxSizer)) )
  83         {
  84                 wxSizer *sizer = (wxSizer *)win;
  85                 return sizer->GetBorderY();
  86         }
  87         else
  88                 return 0;
  89 }
  90
  91
  92 wxIndividualLayoutConstraint::wxIndividualLayoutConstraint()
  93 {
  94   myEdge = wxTop; relationship = wxUnconstrained; margin = 0; value = 0; percent = 0; otherEdge = wxTop;
  95   done = FALSE; otherWin = (wxWindow *) NULL;
  96 }
  97
  98 wxIndividualLayoutConstraint::~wxIndividualLayoutConstraint()
  99 {
 100 }
 101
 102 void wxIndividualLayoutConstraint::Set(wxRelationship rel, wxWindow *otherW, wxEdge otherE, int val, int marg)
 103 {
 104   relationship = rel; otherWin = otherW; otherEdge = otherE; value = val; margin = marg;
 105 }
 106
 107 void wxIndividualLayoutConstraint::LeftOf(wxWindow *sibling, int marg)
 108 { Set(wxLeftOf, sibling, wxLeft, 0, marg); }
 109
 110 void wxIndividualLayoutConstraint::RightOf(wxWindow *sibling, int marg)
 111 { Set(wxRightOf, sibling, wxRight, 0, marg); }
 112
 113 void wxIndividualLayoutConstraint::Above(wxWindow *sibling, int marg)
 114 { Set(wxAbove, sibling, wxTop, 0, marg); }
 115
 116 void wxIndividualLayoutConstraint::Below(wxWindow *sibling, int marg)
 117 { Set(wxBelow, sibling, wxBottom, 0, marg); }
 118
 119 //
 120 // 'Same edge' alignment
 121 //
 122 void wxIndividualLayoutConstraint::SameAs(wxWindow *otherW, wxEdge edge, int marg)
 123 { Set(wxPercentOf, otherW, edge, 0, marg); percent = 100; }
 124
 125 // The edge is a percentage of the other window's edge
 126 void wxIndividualLayoutConstraint::PercentOf(wxWindow *otherW, wxEdge wh, int per)
 127 { otherWin = otherW; relationship = wxPercentOf; percent = per;
 128   otherEdge = wh;
 129 }
 130
 131 //
 132 // Edge has absolute value
 133 //
 134 void wxIndividualLayoutConstraint::Absolute(int val)
 135 { value = val; relationship = wxAbsolute; }
 136
 137 // Reset constraint if it mentions otherWin
 138 bool wxIndividualLayoutConstraint::ResetIfWin(wxWindow *otherW)
 139 {
 140   if (otherW == otherWin)
 141   {
 142     myEdge = wxTop; relationship = wxAsIs; margin = 0; value = 0; percent = 0; otherEdge = wxTop;
 143     otherWin = (wxWindow *) NULL;
 144     return TRUE;
 145   }
 146   else
 147     return FALSE;
 148 }
 149
 150 // Try to satisfy constraint
 151 bool wxIndividualLayoutConstraint::SatisfyConstraint(wxLayoutConstraints *constraints, wxWindow *win)
 152 {
 153   if (relationship == wxAbsolute)
 154   {
 155     done = TRUE;
 156     return TRUE;
 157   }
 158
 159   switch (myEdge)
 160   {
 161     case wxLeft:
 162     {
 163       switch (relationship)
 164       {
 165         case wxLeftOf:
 166         {
 167           // We can know this edge if: otherWin is win's parent,
 168           // or otherWin has a satisfied constraint, or
 169           // otherWin has no constraint.
 170           int edgePos = GetEdge(otherEdge, win, otherWin);
 171           if (edgePos != -1)
 172           {
 173             value = edgePos - margin;
 174             done = TRUE;
 175             return TRUE;
 176           }
 177           else
 178             return FALSE;
 179         }
 180         case wxRightOf:
 181         {
 182           int edgePos = GetEdge(otherEdge, win, otherWin);
 183           if (edgePos != -1)
 184           {
 185             value = edgePos + margin;
 186             done = TRUE;
 187             return TRUE;
 188           }
 189           else
 190             return FALSE;
 191         }
 192         case wxPercentOf:
 193         {
 194           int edgePos = GetEdge(otherEdge, win, otherWin);
 195           if (edgePos != -1)
 196           {
 197             value = (int)(edgePos*(((float)percent)*0.01) + margin);
 198             done = TRUE;
 199             return TRUE;
 200           }
 201           else
 202             return FALSE;
 203         }
 204         case wxUnconstrained:
 205         {
 206           // We know the left-hand edge position if we know
 207           // the right-hand edge and we know the width; OR if we know the centre and the width.
 208           if (constraints->right.GetDone() && constraints->width.GetDone())
 209           {
 210             value = (constraints->right.GetValue() - constraints->width.GetValue() + margin);
 211             done = TRUE;
 212             return TRUE;
 213           }
 214           else if (constraints->centreX.GetDone() && constraints->width.GetDone())
 215           {
 216             value = (int)(constraints->centreX.GetValue() - (constraints->width.GetValue()/2) + margin);
 217             done = TRUE;
 218             return TRUE;
 219           }
 220           else
 221             return FALSE;
 222         }
 223         case wxAsIs:
 224         {
 225           int y;
 226           win->GetPosition(&value, &y);
 227           done = TRUE;
 228           return TRUE;
 229         }
 230         default:
 231           break;
 232       }
 233       break;
 234     }
 235     case wxRight:
 236     {
 237       switch (relationship)
 238       {
 239         case wxLeftOf:
 240         {
 241           // We can know this edge if: otherWin is win's parent,
 242           // or otherWin has a satisfied constraint, or
 243           // otherWin has no constraint.
 244           int edgePos = GetEdge(otherEdge, win, otherWin);
 245           if (edgePos != -1)
 246           {
 247             value = edgePos - margin;
 248             done = TRUE;
 249             return TRUE;
 250           }
 251           else
 252             return FALSE;
 253         }
 254         case wxRightOf:
 255         {
 256           int edgePos = GetEdge(otherEdge, win, otherWin);
 257           if (edgePos != -1)
 258           {
 259             value = edgePos + margin;
 260             done = TRUE;
 261             return TRUE;
 262           }
 263           else
 264             return FALSE;
 265         }
 266         case wxPercentOf:
 267         {
 268           int edgePos = GetEdge(otherEdge, win, otherWin);
 269           if (edgePos != -1)
 270           {
 271             value = (int)(edgePos*(((float)percent)*0.01) - margin);
 272             done = TRUE;
 273             return TRUE;
 274           }
 275           else
 276             return FALSE;
 277         }
 278         case wxUnconstrained:
 279         {
 280           // We know the right-hand edge position if we know
 281           // the left-hand edge and we know the width, OR if we know the
 282           // centre edge and the width.
 283           if (constraints->left.GetDone() && constraints->width.GetDone())
 284           {
 285             value = (constraints->left.GetValue() + constraints->width.GetValue() - margin);
 286             done = TRUE;
 287             return TRUE;
 288           }
 289           else if (constraints->centreX.GetDone() && constraints->width.GetDone())
 290           {
 291             value = (int)(constraints->centreX.GetValue() + (constraints->width.GetValue()/2) - margin);
 292             done = TRUE;
 293             return TRUE;
 294           }
 295           else
 296             return FALSE;
 297         }
 298         case wxAsIs:
 299         {
 300           int x, y;
 301           int w, h;
 302           win->GetSize(&w, &h);
 303           win->GetPosition(&x, &y);
 304           value = x + w;
 305           done = TRUE;
 306           return TRUE;
 307         }
 308         default:
 309           break;
 310       }
 311       break;
 312     }
 313     case wxTop:
 314     {
 315       switch (relationship)
 316       {
 317         case wxAbove:
 318         {
 319           // We can know this edge if: otherWin is win's parent,
 320           // or otherWin has a satisfied constraint, or
 321           // otherWin has no constraint.
 322           int edgePos = GetEdge(otherEdge, win, otherWin);
 323           if (edgePos != -1)
 324           {
 325             value = edgePos - margin;
 326             done = TRUE;
 327             return TRUE;
 328           }
 329           else
 330             return FALSE;
 331         }
 332         case wxBelow:
 333         {
 334           int edgePos = GetEdge(otherEdge, win, otherWin);
 335           if (edgePos != -1)
 336           {
 337             value = edgePos + margin;
 338             done = TRUE;
 339             return TRUE;
 340           }
 341           else
 342             return FALSE;
 343         }
 344         case wxPercentOf:
 345         {
 346           int edgePos = GetEdge(otherEdge, win, otherWin);
 347           if (edgePos != -1)
 348           {
 349             value = (int)(edgePos*(((float)percent)*0.01) + margin);
 350             done = TRUE;
 351             return TRUE;
 352           }
 353           else
 354             return FALSE;
 355         }
 356         case wxUnconstrained:
 357         {
 358           // We know the top edge position if we know
 359           // the bottom edge and we know the height; OR if we know the centre
 360           // edge and the height.
 361           if (constraints->bottom.GetDone() && constraints->height.GetDone())
 362           {
 363             value = (constraints->bottom.GetValue() - constraints->height.GetValue() + margin);
 364             done = TRUE;
 365             return TRUE;
 366           }
 367           else if (constraints->centreY.GetDone() && constraints->height.GetDone())
 368           {
 369             value = (constraints->centreY.GetValue() - (constraints->height.GetValue()/2) + margin);
 370             done = TRUE;
 371             return TRUE;
 372           }
 373           else
 374             return FALSE;
 375         }
 376         case wxAsIs:
 377         {
 378           int x;
 379           win->GetPosition(&x, &value);
 380           done = TRUE;
 381           return TRUE;
 382         }
 383         default:
 384           break;
 385       }
 386       break;
 387     }
 388     case wxBottom:
 389     {
 390       switch (relationship)
 391       {
 392         case wxAbove:
 393         {
 394           // We can know this edge if: otherWin is win's parent,
 395           // or otherWin has a satisfied constraint, or
 396           // otherWin has no constraint.
 397           int edgePos = GetEdge(otherEdge, win, otherWin);
 398           if (edgePos != -1)
 399           {
 400             value = edgePos + margin;
 401             done = TRUE;
 402             return TRUE;
 403           }
 404           else
 405             return FALSE;
 406         }
 407         case wxBelow:
 408         {
 409           int edgePos = GetEdge(otherEdge, win, otherWin);
 410           if (edgePos != -1)
 411           {
 412             value = edgePos - margin;
 413             done = TRUE;
 414             return TRUE;
 415           }
 416           else
 417             return FALSE;
 418         }
 419         case wxPercentOf:
 420         {
 421           int edgePos = GetEdge(otherEdge, win, otherWin);
 422           if (edgePos != -1)
 423           {
 424             value = (int)(edgePos*(((float)percent)*0.01) - margin);
 425             done = TRUE;
 426             return TRUE;
 427           }
 428           else
 429             return FALSE;
 430         }
 431         case wxUnconstrained:
 432         {
 433           // We know the bottom edge position if we know
 434           // the top edge and we know the height; OR if we know the
 435           // centre edge and the height.
 436           if (constraints->top.GetDone() && constraints->height.GetDone())
 437           {
 438             value = (constraints->top.GetValue() + constraints->height.GetValue() - margin);
 439             done = TRUE;
 440             return TRUE;
 441           }
 442           else if (constraints->centreY.GetDone() && constraints->height.GetDone())
 443           {
 444             value = (constraints->centreY.GetValue() + (constraints->height.GetValue()/2) - margin);
 445             done = TRUE;
 446             return TRUE;
 447           }
 448           else
 449             return FALSE;
 450         }
 451         case wxAsIs:
 452         {
 453           int x, y;
 454           int w, h;
 455           win->GetSize(&w, &h);
 456           win->GetPosition(&x, &y);
 457           value = h + y;
 458           done = TRUE;
 459           return TRUE;
 460         }
 461         default:
 462           break;
 463       }
 464       break;
 465     }
 466     case wxCentreX:
 467     {
 468       switch (relationship)
 469       {
 470         case wxLeftOf:
 471         {
 472           // We can know this edge if: otherWin is win's parent,
 473           // or otherWin has a satisfied constraint, or
 474           // otherWin has no constraint.
 475           int edgePos = GetEdge(otherEdge, win, otherWin);
 476           if (edgePos != -1)
 477           {
 478             value = edgePos - margin;
 479             done = TRUE;
 480             return TRUE;
 481           }
 482           else
 483             return FALSE;
 484         }
 485         case wxRightOf:
 486         {
 487           int edgePos = GetEdge(otherEdge, win, otherWin);
 488           if (edgePos != -1)
 489           {
 490             value = edgePos + margin;
 491             done = TRUE;
 492             return TRUE;
 493           }
 494           else
 495             return FALSE;
 496         }
 497         case wxPercentOf:
 498         {
 499           int edgePos = GetEdge(otherEdge, win, otherWin);
 500           if (edgePos != -1)
 501           {
 502             value = (int)(edgePos*(((float)percent)*0.01) + margin);
 503             done = TRUE;
 504             return TRUE;
 505           }
 506           else
 507             return FALSE;
 508         }
 509         case wxUnconstrained:
 510         {
 511           // We know the centre position if we know
 512           // the left-hand edge and we know the width, OR
 513           // the right-hand edge and the width
 514           if (constraints->left.GetDone() && constraints->width.GetDone())
 515           {
 516             value = (int)(constraints->left.GetValue() + (constraints->width.GetValue()/2) + margin);
 517             done = TRUE;
 518             return TRUE;
 519           }
 520           else if (constraints->right.GetDone() && constraints->width.GetDone())
 521           {
 522             value = (int)(constraints->left.GetValue() - (constraints->width.GetValue()/2) + margin);
 523             done = TRUE;
 524             return TRUE;
 525           }
 526           else
 527             return FALSE;
 528         }
 529         default:
 530           break;
 531       }
 532       break;
 533     }
 534     case wxCentreY:
 535     {
 536       switch (relationship)
 537       {
 538         case wxAbove:
 539         {
 540           // We can know this edge if: otherWin is win's parent,
 541           // or otherWin has a satisfied constraint, or
 542           // otherWin has no constraint.
 543           int edgePos = GetEdge(otherEdge, win, otherWin);
 544           if (edgePos != -1)
 545           {
 546             value = edgePos - margin;
 547             done = TRUE;
 548             return TRUE;
 549           }
 550           else
 551             return FALSE;
 552         }
 553         case wxBelow:
 554         {
 555           int edgePos = GetEdge(otherEdge, win, otherWin);
 556           if (edgePos != -1)
 557           {
 558             value = edgePos + margin;
 559             done = TRUE;
 560             return TRUE;
 561           }
 562           else
 563             return FALSE;
 564         }
 565         case wxPercentOf:
 566         {
 567           int edgePos = GetEdge(otherEdge, win, otherWin);
 568           if (edgePos != -1)
 569           {
 570             value = (int)(edgePos*(((float)percent)*0.01) + margin);
 571             done = TRUE;
 572             return TRUE;
 573           }
 574           else
 575             return FALSE;
 576         }
 577         case wxUnconstrained:
 578         {
 579           // We know the centre position if we know
 580           // the top edge and we know the height, OR
 581           // the bottom edge and the height.
 582           if (constraints->bottom.GetDone() && constraints->height.GetDone())
 583           {
 584             value = (int)(constraints->bottom.GetValue() - (constraints->height.GetValue()/2) + margin);
 585             done = TRUE;
 586             return TRUE;
 587           }
 588           else if (constraints->top.GetDone() && constraints->height.GetDone())
 589           {
 590             value = (int)(constraints->top.GetValue() + (constraints->height.GetValue()/2) + margin);
 591             done = TRUE;
 592             return TRUE;
 593           }
 594           else
 595             return FALSE;
 596         }
 597         default:
 598           break;
 599       }
 600       break;
 601     }
 602     case wxWidth:
 603     {
 604       switch (relationship)
 605       {
 606         case wxPercentOf:
 607         {
 608           int edgePos = GetEdge(otherEdge, win, otherWin);
 609           if (edgePos != -1)
 610           {
 611             value = (int)(edgePos*(((float)percent)*0.01));
 612             done = TRUE;
 613             return TRUE;
 614           }
 615           else
 616             return FALSE;
 617         }
 618         case wxAsIs:
 619         {
 620           if (win)
 621           {
 622             int h;
 623             win->GetSize(&value, &h);
 624             done = TRUE;
 625             return TRUE;
 626           }
 627           else return FALSE;
 628         }
 629         case wxUnconstrained:
 630         {
 631           // We know the width if we know the left edge and the right edge, OR
 632           // if we know the left edge and the centre, OR
 633           // if we know the right edge and the centre
 634           if (constraints->left.GetDone() && constraints->right.GetDone())
 635           {
 636             value = constraints->right.GetValue() - constraints->left.GetValue();
 637             done = TRUE;
 638             return TRUE;
 639           }
 640           else if (constraints->centreX.GetDone() && constraints->left.GetDone())
 641           {
 642             value = (int)(2*(constraints->centreX.GetValue() - constraints->left.GetValue()));
 643             done = TRUE;
 644             return TRUE;
 645           }
 646           else if (constraints->centreX.GetDone() && constraints->right.GetDone())
 647           {
 648             value = (int)(2*(constraints->right.GetValue() - constraints->centreX.GetValue()));
 649             done = TRUE;
 650             return TRUE;
 651           }
 652           else
 653             return FALSE;
 654         }
 655         default:
 656           break;
 657       }
 658       break;
 659     }
 660     case wxHeight:
 661     {
 662       switch (relationship)
 663       {
 664         case wxPercentOf:
 665         {
 666           int edgePos = GetEdge(otherEdge, win, otherWin);
 667           if (edgePos != -1)
 668           {
 669             value = (int)(edgePos*(((float)percent)*0.01));
 670             done = TRUE;
 671             return TRUE;
 672           }
 673           else
 674             return FALSE;
 675         }
 676         case wxAsIs:
 677         {
 678           if (win)
 679           {
 680             int w;
 681             win->GetSize(&w, &value);
 682             done = TRUE;
 683             return TRUE;
 684           }
 685           else return FALSE;
 686         }
 687         case wxUnconstrained:
 688         {
 689           // We know the height if we know the top edge and the bottom edge, OR
 690           // if we know the top edge and the centre, OR
 691           // if we know the bottom edge and the centre
 692           if (constraints->top.GetDone() && constraints->bottom.GetDone())
 693           {
 694             value = constraints->bottom.GetValue() - constraints->top.GetValue();
 695             done = TRUE;
 696             return TRUE;
 697           }
 698           else if (constraints->top.GetDone() && constraints->centreY.GetDone())
 699           {
 700             value = (int)(2*(constraints->centreY.GetValue() - constraints->top.GetValue()));
 701             done = TRUE;
 702             return TRUE;
 703           }
 704           else if (constraints->bottom.GetDone() && constraints->centreY.GetDone())
 705           {
 706             value = (int)(2*(constraints->bottom.GetValue() - constraints->centreY.GetValue()));
 707             done = TRUE;
 708             return TRUE;
 709           }
 710           else
 711             return FALSE;
 712         }
 713         default:
 714           break;
 715       }
 716       break;
 717     }
 718     default:
 719       break;
 720   }
 721   return FALSE;
 722 }
 723
 724 // Get the value of this edge or dimension, or if this
 725 // is not determinable, -1.
 726 int wxIndividualLayoutConstraint::GetEdge(wxEdge which,
 727                                           wxWindow *thisWin,
 728                                           wxWindow *other) const
 729 {
 730   // If the edge or dimension belongs to the parent, then we
 731   // know the dimension is obtainable immediately.
 732   // E.g. a wxExpandSizer may contain a button (but the button's
 733   // true parent is a panel, not the sizer)
 734   if (other->GetChildren()->Member(thisWin))
 735   {
 736     switch (which)
 737     {
 738       case wxLeft:
 739           {
 740                 return wxSizerMarginX(other);
 741           }
 742       case wxTop:
 743       {
 744         return wxSizerMarginY(other);
 745       }
 746       case wxRight:
 747           {
 748         int w, h;
 749         other->GetClientSizeConstraint(&w, &h);
 750         return w - wxSizerMarginX(other);
 751           }
 752       case wxBottom:
 753           {
 754         int w, h;
 755         other->GetClientSizeConstraint(&w, &h);
 756         return h - wxSizerMarginY(other);
 757           }
 758       case wxWidth:
 759           {
 760         int w, h;
 761         other->GetClientSizeConstraint(&w, &h);
 762         return w - 2*wxSizerMarginX(other);
 763           }
 764       case wxHeight:
 765       {
 766         int w, h;
 767         other->GetClientSizeConstraint(&w, &h);
 768         return h - 2*wxSizerMarginY(other);
 769       }
 770       case wxCentreX:
 771       case wxCentreY:
 772       {
 773         int w, h;
 774         other->GetClientSizeConstraint(&w, &h);
 775         if (which == wxCentreX)
 776           return (int)(w/2);
 777         else
 778           return (int)(h/2);
 779       }
 780       default:
 781         return -1;
 782     }
 783   }
 784   switch (which)
 785   {
 786     case wxLeft:
 787     {
 788       wxLayoutConstraints *constr = other->GetConstraints();
 789       // If no constraints, it means the window is not dependent
 790       // on anything, and therefore we know its value immediately
 791       if (constr)
 792       {
 793         if (constr->left.GetDone())
 794           return constr->left.GetValue();
 795         else
 796           return -1;
 797       }
 798       else
 799       {
 800         int x, y;
 801         other->GetPosition(&x, &y);
 802         return x;
 803       }
 804     }
 805     case wxTop:
 806     {
 807       wxLayoutConstraints *constr = other->GetConstraints();
 808       // If no constraints, it means the window is not dependent
 809       // on anything, and therefore we know its value immediately
 810       if (constr)
 811       {
 812         if (constr->top.GetDone())
 813           return constr->top.GetValue();
 814         else
 815           return -1;
 816       }
 817       else
 818       {
 819         int x, y;
 820         other->GetPosition(&x, &y);
 821         return y;
 822       }
 823     }
 824     case wxRight:
 825     {
 826       wxLayoutConstraints *constr = other->GetConstraints();
 827       // If no constraints, it means the window is not dependent
 828       // on anything, and therefore we know its value immediately
 829       if (constr)
 830       {
 831         if (constr->right.GetDone())
 832           return constr->right.GetValue();
 833         else
 834           return -1;
 835       }
 836       else
 837       {
 838         int x, y, w, h;
 839         other->GetPosition(&x, &y);
 840         other->GetSize(&w, &h);
 841         return (int)(x + w);
 842       }
 843     }
 844     case wxBottom:
 845     {
 846       wxLayoutConstraints *constr = other->GetConstraints();
 847       // If no constraints, it means the window is not dependent
 848       // on anything, and therefore we know its value immediately
 849       if (constr)
 850       {
 851         if (constr->bottom.GetDone())
 852           return constr->bottom.GetValue();
 853         else
 854           return -1;
 855       }
 856       else
 857       {
 858         int x, y, w, h;
 859         other->GetPosition(&x, &y);
 860         other->GetSize(&w, &h);
 861         return (int)(y + h);
 862       }
 863     }
 864     case wxWidth:
 865     {
 866       wxLayoutConstraints *constr = other->GetConstraints();
 867       // If no constraints, it means the window is not dependent
 868       // on anything, and therefore we know its value immediately
 869       if (constr)
 870       {
 871         if (constr->width.GetDone())
 872           return constr->width.GetValue();
 873         else
 874           return -1;
 875       }
 876       else
 877       {
 878         int w, h;
 879         other->GetSize(&w, &h);
 880         return w;
 881       }
 882     }
 883     case wxHeight:
 884     {
 885       wxLayoutConstraints *constr = other->GetConstraints();
 886       // If no constraints, it means the window is not dependent
 887       // on anything, and therefore we know its value immediately
 888       if (constr)
 889       {
 890         if (constr->height.GetDone())
 891           return constr->height.GetValue();
 892         else
 893           return -1;
 894       }
 895       else
 896       {
 897         int w, h;
 898         other->GetSize(&w, &h);
 899         return h;
 900       }
 901     }
 902     case wxCentreX:
 903     {
 904       wxLayoutConstraints *constr = other->GetConstraints();
 905       // If no constraints, it means the window is not dependent
 906       // on anything, and therefore we know its value immediately
 907       if (constr)
 908       {
 909         if (constr->centreX.GetDone())
 910           return constr->centreX.GetValue();
 911         else
 912           return -1;
 913       }
 914       else
 915       {
 916         int x, y, w, h;
 917         other->GetPosition(&x, &y);
 918         other->GetSize(&w, &h);
 919         return (int)(x + (w/2));
 920       }
 921     }
 922     case wxCentreY:
 923     {
 924       wxLayoutConstraints *constr = other->GetConstraints();
 925       // If no constraints, it means the window is not dependent
 926       // on anything, and therefore we know its value immediately
 927       if (constr)
 928       {
 929         if (constr->centreY.GetDone())
 930           return constr->centreY.GetValue();
 931         else
 932           return -1;
 933       }
 934       else
 935       {
 936         int x, y, w, h;
 937         other->GetPosition(&x, &y);
 938         other->GetSize(&w, &h);
 939         return (int)(y + (h/2));
 940       }
 941     }
 942     default:
 943       break;
 944   }
 945   return -1;
 946 }
 947
 948 wxLayoutConstraints::wxLayoutConstraints()
 949 {
 950   left.SetEdge(wxLeft);
 951   top.SetEdge(wxTop);
 952   right.SetEdge(wxRight);
 953   bottom.SetEdge(wxBottom);
 954   centreX.SetEdge(wxCentreX);
 955   centreY.SetEdge(wxCentreY);
 956   width.SetEdge(wxWidth);
 957   height.SetEdge(wxHeight);
 958 }
 959
 960 wxLayoutConstraints::~wxLayoutConstraints()
 961 {
 962 }
 963
 964 bool wxLayoutConstraints::SatisfyConstraints(wxWindow *win, int *nChanges)
 965 {
 966   int noChanges = 0;
 967
 968   bool done = width.GetDone();
 969   bool newDone = (done ? TRUE : width.SatisfyConstraint(this, win));
 970   if (newDone != done)
 971     noChanges ++;
 972
 973   done = height.GetDone();
 974   newDone = (done ? TRUE : height.SatisfyConstraint(this, win));
 975   if (newDone != done)
 976     noChanges ++;
 977
 978   done = left.GetDone();
 979   newDone = (done ? TRUE : left.SatisfyConstraint(this, win));
 980   if (newDone != done)
 981     noChanges ++;
 982
 983   done = top.GetDone();
 984   newDone = (done ? TRUE : top.SatisfyConstraint(this, win));
 985   if (newDone != done)
 986     noChanges ++;
 987
 988   done = right.GetDone();
 989   newDone = (done ? TRUE : right.SatisfyConstraint(this, win));
 990   if (newDone != done)
 991     noChanges ++;
 992
 993   done = bottom.GetDone();
 994   newDone = (done ? TRUE : bottom.SatisfyConstraint(this, win));
 995   if (newDone != done)
 996     noChanges ++;
 997
 998   done = centreX.GetDone();
 999   newDone = (done ? TRUE : centreX.SatisfyConstraint(this, win));
1000   if (newDone != done)
1001     noChanges ++;
1002
1003   done = centreY.GetDone();
1004   newDone = (done ? TRUE : centreY.SatisfyConstraint(this, win));
1005   if (newDone != done)
1006     noChanges ++;
1007
1008   *nChanges = noChanges;
1009
1010   return AreSatisfied();
1011 }
1012
1013 /*
1014  * Main constrained layout algorithm. Look at all the child
1015  * windows, and their constraints (if any).
1016  * The idea is to keep iterating through the constraints
1017  * until all left, right, bottom and top edges, and widths and heights,
1018  * are known (or no change occurs and we've failed to resolve all
1019  * constraints).
1020  *
1021  * If the user has not specified a dimension or edge, it will be
1022  * be calculated from the other known values. E.g. If we know
1023  * the right hand edge and the left hand edge, we now know the width.
1024  * The snag here is that this means we must specify absolute dimensions
1025  * twice (in constructor and in constraint), if we wish to use the
1026  * constraint notation to just set the position, for example.
1027  * Otherwise, if we only set ONE edge and no dimension, it would never
1028  * find the other edge.
1029  *
1030  * Algorithm:
1031
1032   Mark all constraints as not done.
1033
1034   iterations = 0;
1035   until no change or iterations >= max iterations
1036     For each child:
1037     {
1038       Calculate all constraints
1039     }
1040     iterations ++;
1041
1042   For each child
1043     Set each calculated position and size
1044
1045  */
1046
1047 bool wxOldDoLayout(wxWindow *win)
1048 {
1049   // Make sure this isn't called recursively from below
1050   static wxList doneSoFar;
1051
1052   if (doneSoFar.Member(win))
1053     return TRUE;
1054
1055   doneSoFar.Append(win);
1056
1057   wxNode *node = win->GetChildren()->First();
1058   while (node)
1059   {
1060     wxWindow *child = (wxWindow *)node->Data();
1061     wxLayoutConstraints *constr = child->GetConstraints();
1062     if (constr)
1063     {
1064       constr->left.SetDone(FALSE);
1065       constr->top.SetDone(FALSE);
1066       constr->right.SetDone(FALSE);
1067       constr->bottom.SetDone(FALSE);
1068       constr->width.SetDone(FALSE);
1069       constr->height.SetDone(FALSE);
1070       constr->centreX.SetDone(FALSE);
1071       constr->centreY.SetDone(FALSE);
1072     }
1073     node = node->Next();
1074   }
1075   int noIterations = 0;
1076   int maxIterations = 500;
1077   int noChanges = 1;
1078
1079   while ((noChanges > 0) && (noIterations < maxIterations))
1080   {
1081     noChanges = 0;
1082     wxNode *node = win->GetChildren()->First();
1083     while (node)
1084     {
1085       wxWindow *child = (wxWindow *)node->Data();
1086       wxLayoutConstraints *constr = child->GetConstraints();
1087       if (constr)
1088       {
1089         int tempNoChanges = 0;
1090         (void)constr->SatisfyConstraints(child, &tempNoChanges);
1091         noChanges += tempNoChanges;
1092       }
1093       node = node->Next();
1094     }
1095     noIterations ++;
1096   }
1097 /*
1098   // Would be nice to have a test here to see _which_ constraint(s)
1099   // failed, so we can print a specific diagnostic message.
1100   if (noFailures > 0)
1101   {
1102     wxDebugMsg(_("wxWindow::Layout() failed.\n"));
1103   }
1104 */
1105   // Now set the sizes and positions of the children, and
1106   // recursively call Layout().
1107   node = win->GetChildren()->First();
1108   while (node)
1109   {
1110     wxWindow *child = (wxWindow *)node->Data();
1111     wxLayoutConstraints *constr = child->GetConstraints();
1112     if (constr && constr->left.GetDone() && constr->right.GetDone() &&
1113                   constr->width.GetDone() && constr->height.GetDone())
1114     {
1115       int x = constr->left.GetValue();
1116       int y = constr->top.GetValue();
1117       int w = constr->width.GetValue();
1118       int h = constr->height.GetValue();
1119
1120       // If we don't want to resize this window, just move it...
1121       if ((constr->width.GetRelationship() != wxAsIs) ||
1122           (constr->height.GetRelationship() != wxAsIs))
1123       {
1124         // _Should_ call Layout() recursively.
1125         child->SetSize(x, y, w, h);
1126       }
1127       else
1128       {
1129         child->Move(x, y);
1130       }
1131     }
1132     else
1133       child->Layout();
1134     node = node->Next();
1135   }
1136   doneSoFar.DeleteObject(win);
1137
1138   return TRUE;
1139 }
1140
1141 wxSizer::wxSizer()
1142 {
1143   sizerBehaviour = wxSizerNone;
1144   borderX = 2;
1145   borderY = 2;
1146   sizerX = 0;
1147   sizerY = 0;
1148   sizerWidth = 0;
1149   sizerHeight = 0;
1150 }
1151
1152 wxSizer::wxSizer(wxWindow *parent, wxSizerBehaviour behav)
1153 {
1154   Create(parent, behav);
1155 }
1156
1157 bool wxSizer::Create(wxWindow *parent, wxSizerBehaviour behav)
1158 {
1159   sizerBehaviour = behav;
1160   borderX = 2;
1161   borderY = 2;
1162   m_sizerParent = parent;
1163   sizerX = 0;
1164   sizerY = 0;
1165   sizerWidth = 0;
1166   sizerHeight = 0;
1167
1168   // A normal window can have just one top-level sizer
1169   // associated with it.
1170   if (!parent->IsKindOf(CLASSINFO(wxSizer)))
1171   {
1172     parent->SetSizer(this);
1173   }
1174   else
1175     ((wxSizer *)parent)->AddSizerChild(this);
1176
1177   switch (sizerBehaviour)
1178   {
1179     case wxSizerExpand:
1180     {
1181       // Defines a set of constraints
1182       // to expand the sizer to fit the parent window
1183       wxLayoutConstraints *c = new wxLayoutConstraints;
1184
1185       c->left.SameAs(parent, wxLeft, 0);
1186       c->top.SameAs(parent, wxTop, 0);
1187       c->right.SameAs(parent, wxRight, 0);
1188       c->bottom.SameAs(parent, wxBottom, 0);
1189
1190       SetConstraints(c);
1191       break;
1192     }
1193     case wxSizerShrink:
1194     case wxSizerNone:
1195     default:
1196     {
1197     }
1198   }
1199   return TRUE;
1200 }
1201
1202 wxSizer::~wxSizer()
1203 {
1204   // Remove all children without deleting them,
1205   // or ~wxbWindow will delete proper windows _twice_
1206   wxNode *node = GetChildren()->First();
1207   while (node)
1208   {
1209     wxNode *next = node->Next();
1210     wxWindow *win = (wxWindow *)node->Data();
1211     if (!win->IsKindOf(CLASSINFO(wxSizer)))
1212         {
1213         delete node;
1214                 win->SetSizerParent((wxWindow *) NULL);
1215         }
1216     else
1217     {
1218       RemoveSizerChild(win);
1219       delete win;
1220     }
1221     node = next;
1222   }
1223
1224   if (m_sizerParent) // && !m_sizerParent->IsKindOf(CLASSINFO(wxSizer)))
1225   {
1226     m_sizerParent->SetSizer((wxSizer *) NULL);
1227         m_sizerParent = (wxWindow *) NULL;
1228   }
1229
1230 }
1231
1232 void wxSizer::SetBorder(int x, int y)
1233 {
1234         borderX = x;
1235         borderY = y;
1236 /* No: the margin is for inside, not outside (expansion)
1237
1238         if ( GetConstraints() )
1239         {
1240                 GetConstraints()->left.SetMargin(x);
1241                 GetConstraints()->right.SetMargin(x);
1242                 GetConstraints()->top.SetMargin(y);
1243                 GetConstraints()->bottom.SetMargin(y);
1244         }
1245 */
1246
1247 }
1248
1249 void wxSizer::AddSizerChild(wxWindow *child)
1250 {
1251   child->SetSizerParent(this);
1252   GetChildren()->Append(child);
1253
1254   // Add some constraints for the purpose of storing
1255   // the relative position of the window/sizer
1256   // during layout calculations.
1257   if (!child->GetConstraints())
1258   {
1259     wxLayoutConstraints *c = new wxLayoutConstraints;
1260     c->left.AsIs();
1261     c->top.AsIs();
1262     c->width.AsIs();
1263     c->height.AsIs();
1264     int w, h;
1265     child->GetSize(&w, &h);
1266     c->width.SetValue(w);
1267     c->height.SetValue(h);
1268
1269     child->SetConstraints(c);
1270   }
1271 }
1272
1273 void wxSizer::RemoveSizerChild(wxWindow *child)
1274 {
1275   GetChildren()->DeleteObject(child);
1276 }
1277
1278 void wxSizer::SetSize(int x, int y, int w, int h, int WXUNUSED(flags))
1279 {
1280   wxLayoutConstraints *constr = GetConstraints();
1281   if (x != -1)
1282   {
1283     sizerX = x;
1284     if (constr)
1285       constr->left.SetValue(x);
1286   }
1287   if (y != -1)
1288   {
1289     sizerY = y;
1290     if (constr)
1291       constr->top.SetValue(y);
1292   }
1293   if (w != -1)
1294   {
1295     sizerWidth = w;
1296     if (constr)
1297       constr->width.SetValue(w);
1298   }
1299   if (h != -1)
1300   {
1301     sizerHeight = h;
1302     if (constr)
1303       constr->height.SetValue(h);
1304   }
1305 }
1306
1307 void wxSizer::Move(int x, int y)
1308 {
1309   wxLayoutConstraints *constr = GetConstraints();
1310   if (x != -1)
1311   {
1312     sizerX = x;
1313     if (constr)
1314       constr->left.SetValue(x);
1315   }
1316   if (y != -1)
1317   {
1318     sizerY = y;
1319     if (constr)
1320       constr->top.SetValue(y);
1321   }
1322 }
1323
1324 void wxSizer::GetSize(int *w, int *h) const
1325 {
1326   *w = sizerWidth;
1327   *h = sizerHeight;
1328 }
1329
1330 void wxSizer::GetPosition(int *x, int *y) const
1331 {
1332   *x = sizerX;
1333   *y = sizerY;
1334 }
1335
1336 bool wxSizer::LayoutPhase1(int *noChanges)
1337 {
1338   *noChanges = 0;
1339   switch (sizerBehaviour)
1340   {
1341     case wxSizerExpand:
1342     {
1343       if (!m_sizerParent)
1344       {
1345         wxMessageBox(_("wxExpandSizer has no parent!"), _("Sizer error"), wxOK);
1346         return TRUE;
1347       }
1348
1349       // Set the size to fill the parent client area
1350       int pw, ph;
1351       m_sizerParent->GetClientSize(&pw, &ph);
1352       SetSize(GetBorderX(), GetBorderY(), pw - 2*GetBorderX(), ph - 2*GetBorderY());
1353       wxLayoutConstraints *constr = GetConstraints();
1354
1355       // Fill in the constraints
1356       if (constr)
1357       {
1358         constr->left.SetValue(0); constr->left.SetDone(TRUE);
1359         constr->top.SetValue(0); constr->right.SetDone(TRUE);
1360         constr->width.SetValue(pw); constr->width.SetDone(TRUE);
1361         constr->height.SetValue(ph); constr->height.SetDone(TRUE);
1362       }
1363
1364       return TRUE;
1365       break;
1366     }
1367     case wxSizerShrink:
1368     {
1369       wxLayoutConstraints *constr = GetConstraints();
1370
1371       if (constr)
1372       {
1373         // Force the constraint to have as-is width and height
1374         // if we're in shrink-to-fit mode, because if left unconstrained,
1375         // SatisfyConstraints will fail. The shrink-to-fit option
1376         // essentially specifies the width and height as 'whatever I calculate'.
1377         constr->width.AsIs();
1378         constr->height.AsIs();
1379       }
1380       DoPhase(1);
1381       DoPhase(2);
1382       // Find the bounding box and set own size
1383       int maxX = 0;
1384       int maxY = 0;
1385       wxNode *node = GetChildren()->First();
1386       while (node)
1387       {
1388         int x, y, width, height;
1389         wxWindow *win = (wxWindow *)node->Data();
1390         win->GetSizeConstraint(&width, &height);
1391         win->GetPositionConstraint(&x, &y);
1392         if ((x+width) > maxX)
1393           maxX = (x + width);
1394         if ((y+height) > maxY)
1395           maxY = (y + height);
1396         node = node->Next();
1397       }
1398       SetSize(GetBorderX(), GetBorderY(), maxX, maxY);
1399
1400           // If this is the only sizer for the parent, size the parent to this sizer.
1401           if ( m_sizerParent && (m_sizerParent->GetSizer() == this) )
1402                 m_sizerParent->SetClientSize(maxX + 2*GetBorderX(), maxY + 2*GetBorderY());
1403
1404       return TRUE;
1405       break;
1406     }
1407     case wxSizerNone:
1408     {
1409       wxLayoutConstraints *constr = GetConstraints();
1410       if (constr)
1411       {
1412         bool success = constr->SatisfyConstraints(this, noChanges);
1413         if (success)
1414         {
1415           int x = constr->left.GetValue();
1416           int y = constr->top.GetValue();
1417           int w = constr->width.GetValue();
1418           int h = constr->height.GetValue();
1419           SetSize(x, y, w, h);
1420         }
1421         return success;
1422       }
1423       else
1424         return TRUE;
1425       break;
1426     }
1427   }
1428   return TRUE;
1429
1430 }
1431
1432 bool wxSizer::LayoutPhase2(int *noChanges)
1433 {
1434   *noChanges = 0;
1435
1436   switch (sizerBehaviour)
1437   {
1438     case wxSizerExpand:
1439     {
1440       // Layout children
1441       DoPhase(1);
1442       DoPhase(2);
1443       return TRUE;
1444     }
1445     case wxSizerShrink:
1446     {
1447       wxLayoutConstraints *constr = GetConstraints();
1448       if (constr)
1449       {
1450         bool success = constr->SatisfyConstraints(this, noChanges);
1451         if (success)
1452         {
1453           int x = constr->left.GetValue();
1454           int y = constr->top.GetValue();
1455           Move(x, y);
1456         }
1457         return success;
1458       }
1459       break;
1460     }
1461     case wxSizerNone:
1462     {
1463       // Layout children
1464       DoPhase(1);
1465       DoPhase(2);
1466
1467           // Is this a dumb fix for lack of constraint evaluation?
1468       wxLayoutConstraints *constr = GetConstraints();
1469       if (constr)
1470       {
1471         bool success = constr->SatisfyConstraints(this, noChanges);
1472         if (success)
1473         {
1474           int x = constr->left.GetValue();
1475           int y = constr->top.GetValue();
1476           int w = constr->width.GetValue();
1477           int h = constr->height.GetValue();
1478           SetSize(x, y, w, h);
1479         }
1480         return success;
1481       }
1482       else
1483         return TRUE;
1484     }
1485   }
1486   return TRUE;
1487 }
1488
1489 /*
1490  * wxRowColSizer
1491  */
1492
1493 wxRowColSizer::wxRowColSizer()
1494 {
1495   rowOrCol = TRUE;
1496   rowOrColSize = 20;
1497   xSpacing = 2;
1498   ySpacing = 2;
1499 }
1500
1501 wxRowColSizer::wxRowColSizer(wxWindow *parent, bool rc, int n, wxSizerBehaviour behav)
1502 {
1503   Create(parent, rc, n, behav);
1504 }
1505
1506 bool wxRowColSizer::Create(wxWindow *parent, bool rc, int n, wxSizerBehaviour behav)
1507 {
1508   wxSizer::Create(parent, behav);
1509
1510   rowOrCol = rc;
1511   rowOrColSize = n;
1512   xSpacing = 2;
1513   ySpacing = 2;
1514
1515   return TRUE;
1516 }
1517
1518 wxRowColSizer::~wxRowColSizer()
1519 {
1520 }
1521
1522 void wxRowColSizer::SetSize(int x, int y, int w, int h, int flags)
1523 {
1524   wxSizer::SetSize(x, y, w, h, flags);
1525 }
1526
1527 bool wxRowColSizer::LayoutPhase1(int *noChanges)
1528 {
1529   *noChanges = 0;
1530   wxLayoutConstraints *constr = GetConstraints();
1531
1532   if (constr)
1533   {
1534     // Force the constraint to have as-is width and height
1535     // if we're in shrink-to-fit mode, because if left unconstrained,
1536     // SatisfyConstraints will fail. The shrink-to-fit option
1537     // essentially specifies the width and height as 'whatever I calculate'.
1538     if (sizerBehaviour == wxSizerShrink)
1539     {
1540       constr->width.AsIs();
1541       constr->height.AsIs();
1542     }
1543
1544     // Only evaluate the constraints FIRST if we're NOT
1545     // in shrink-to-fit mode, i.e. we want to size the rowcol
1546     // first, then lay the children out in the space we've calculated.
1547     if (sizerBehaviour != wxSizerShrink)
1548     {
1549       bool success = constr->SatisfyConstraints(this, noChanges);
1550       if (success)
1551       {
1552         int x = constr->left.GetValue();
1553         int y = constr->top.GetValue();
1554         int w = constr->width.GetValue();
1555         int h = constr->height.GetValue();
1556         SetSize(x, y, w, h);
1557       }
1558       else
1559         return FALSE;
1560
1561       // Continue to do the rest of the phase when the constraints have been
1562       // satisfied, i.e. we're on the last iteration of phase 1 and
1563       // can now do the actual rowcol laying out.
1564     }
1565   }
1566
1567   // If we ARE in shrink-to-fit mode, we must now
1568   // calculate the child sizes BEFORE laying out in rows or columns.
1569   if (sizerBehaviour == wxSizerShrink)
1570   {
1571     DoPhase(1);
1572     DoPhase(2);
1573
1574     // WILL THE WINDOW BE SIZED CORRECTLY AT THIS POINT?
1575     // CHECK CONSTRAINTS IF ANY...
1576     int noRows = 0;
1577     int noCols = 0;
1578     int currentX = borderX;
1579     int currentY = borderY;
1580     int maxX = currentX;
1581     int maxY = currentY;
1582
1583     wxNode *node = GetChildren()->First();
1584     while (node)
1585     {
1586       wxWindow *win = (wxWindow *)node->Data();
1587       int childWidth, childHeight;
1588       if (win->GetConstraints() &&
1589           win->GetConstraints()->width.GetDone() &&
1590           win->GetConstraints()->height.GetDone())
1591       {
1592         childWidth = win->GetConstraints()->width.GetValue();
1593         childHeight = win->GetConstraints()->height.GetValue();
1594       }
1595       else
1596         win->GetSize(&childWidth, &childHeight);
1597
1598       win->MoveConstraint(currentX, currentY);
1599
1600       if ((currentX + childWidth) > maxX)
1601         maxX = (currentX + childWidth);
1602       if ((currentY + childHeight) > maxY)
1603         maxY = (currentY + childHeight);
1604
1605       if (rowOrCol)
1606       {
1607         currentX += childWidth + xSpacing;
1608         noCols ++;
1609
1610         // Reset to start of row
1611         if (noCols == rowOrColSize)
1612         {
1613           currentX = borderX;
1614           currentY += childHeight + ySpacing;
1615           noCols = 0;
1616         }
1617       }
1618       else
1619       {
1620         currentY += childHeight + ySpacing;
1621         noRows ++;
1622
1623         // Reset to start of col
1624         if (noRows == rowOrColSize)
1625         {
1626           currentY = borderY;
1627           currentX += childWidth + xSpacing;
1628           noRows = 0;
1629         }
1630       }
1631
1632       node = node->Next();
1633     }
1634     maxX += borderX;
1635     maxY += borderY;
1636
1637     SetSize(-1, -1, maxX, maxY);
1638   }
1639   return TRUE;
1640 }
1641
1642 bool wxRowColSizer::LayoutPhase2(int *noChanges)
1643 {
1644   *noChanges = 0;
1645
1646   // If shrink-to-fit, it's only at Phase 2 that we know the size of
1647   // the wxRowColSizer, and now we can evaluate the
1648   // constraints and pass result back up to parent.
1649   // This implements a depth-first strategy
1650   if (sizerBehaviour == wxSizerShrink)
1651   {
1652     wxLayoutConstraints *constr = GetConstraints();
1653     if (constr)
1654     {
1655       bool success = constr->SatisfyConstraints(this, noChanges);
1656       if (success)
1657       {
1658         int x = constr->left.GetValue();
1659         int y = constr->top.GetValue();
1660         Move(x, y);
1661       }
1662       return success;
1663     }
1664     else return TRUE;
1665   }
1666   else
1667   {
1668     // Lay out the children: breadth-first strategy.
1669     DoPhase(1);
1670     DoPhase(2);
1671
1672     // Space them
1673   }
1674   return TRUE;
1675 }
1676
1677
1678 /*
1679  * wxSpacingSizer
1680  */
1681
1682 wxSpacingSizer::wxSpacingSizer()
1683 {
1684 }
1685
1686 wxSpacingSizer::wxSpacingSizer(wxWindow *parent)
1687 {
1688   Create(parent);
1689 }
1690
1691 wxSpacingSizer::wxSpacingSizer(wxWindow *parent, wxRelationship rel, wxWindow *other, int spacing)
1692 {
1693   Create(parent, rel, other, spacing);
1694 }
1695
1696 bool wxSpacingSizer::Create(wxWindow *parent)
1697 {
1698   wxSizer::Create(parent);
1699   return TRUE;
1700 }
1701
1702 bool wxSpacingSizer::Create(wxWindow *parent, wxRelationship rel, wxWindow *other, int spacing)
1703 {
1704   wxLayoutConstraints *c = new wxLayoutConstraints;
1705
1706   wxSizer::Create(parent);
1707
1708   switch ( rel )
1709   {
1710         case wxLeftOf :
1711                 c->width.Absolute       (spacing);
1712                 c->top.SameAs           (other, wxTop);
1713                 c->bottom.SameAs        (other, wxBottom);
1714                 c->right.LeftOf         (other);
1715                 break;
1716         case wxRightOf :
1717                 c->width.Absolute       (spacing);
1718                 c->top.SameAs           (other, wxTop);
1719                 c->bottom.SameAs        (other, wxBottom);
1720                 c->left.RightOf         (other);
1721                 break;
1722         case wxBelow :
1723                 c->height.Absolute      (spacing);
1724                 c->left.SameAs          (other, wxLeft);
1725                 c->right.SameAs         (other, wxRight);
1726                 c->top.Below            (other);
1727                 break;
1728         case wxAbove :
1729                 c->height.Absolute      (spacing);
1730                 c->left.SameAs          (other, wxLeft);
1731                 c->right.SameAs         (other, wxRight);
1732                 c->bottom.Above         (other);
1733                 break;
1734
1735         default :
1736                 break;
1737   }
1738   SetConstraints(c);
1739
1740   return TRUE;
1741 }
1742
1743 wxSpacingSizer::~wxSpacingSizer()
1744 {
1745 }
1746
1747
1748
1749 #endif