src/common/layout.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/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
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // =============================================================================
  13 // declarations
  14 // =============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #if wxUSE_CONSTRAINTS
  28
  29 #include "wx/layout.h"
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/window.h"
  33     #include "wx/utils.h"
  34     #include "wx/dialog.h"
  35     #include "wx/msgdlg.h"
  36     #include "wx/intl.h"
  37 #endif
  38
  39
  40 IMPLEMENT_DYNAMIC_CLASS(wxIndividualLayoutConstraint, wxObject)
  41 IMPLEMENT_DYNAMIC_CLASS(wxLayoutConstraints, wxObject)
  42
  43
  44 inline void wxGetAsIs(wxWindowBase* win, int* w, int* h)
  45 {
  46 #if 1
  47     // The old way.  Works for me.
  48     win->GetSize(w, h);
  49 #endif
  50
  51 #if 0
  52     // Vadim's change.  Breaks wxPython's LayoutAnchors
  53     win->GetBestSize(w, h);
  54 #endif
  55
  56 #if 0
  57     // Proposed compromise.  Doesn't work.
  58     int sw, sh, bw, bh;
  59     win->GetSize(&sw, &sh);
  60     win->GetBestSize(&bw, &bh);
  61     if (w)
  62         *w = wxMax(sw, bw);
  63     if (h)
  64         *h = wxMax(sh, bh);
  65 #endif
  66 }
  67
  68
  69 wxIndividualLayoutConstraint::wxIndividualLayoutConstraint()
  70 {
  71     myEdge = wxTop;
  72     relationship = wxUnconstrained;
  73     margin = 0;
  74     value = 0;
  75     percent = 0;
  76     otherEdge = wxTop;
  77     done = false;
  78     otherWin = NULL;
  79 }
  80
  81 void wxIndividualLayoutConstraint::Set(wxRelationship rel, wxWindowBase *otherW, wxEdge otherE, int val, int marg)
  82 {
  83     if (rel == wxSameAs)
  84     {
  85         // If Set is called by the user with wxSameAs then call SameAs to do
  86         // it since it will actually use wxPercent instead.
  87         SameAs(otherW, otherE, marg);
  88         return;
  89     }
  90
  91     relationship = rel;
  92     otherWin = otherW;
  93     otherEdge = otherE;
  94
  95     if ( rel == wxPercentOf )
  96     {
  97         percent = val;
  98     }
  99     else
 100     {
 101         value = val;
 102     }
 103
 104     margin = marg;
 105 }
 106
 107 void wxIndividualLayoutConstraint::LeftOf(wxWindowBase *sibling, int marg)
 108 {
 109     Set(wxLeftOf, sibling, wxLeft, 0, marg);
 110 }
 111
 112 void wxIndividualLayoutConstraint::RightOf(wxWindowBase *sibling, int marg)
 113 {
 114     Set(wxRightOf, sibling, wxRight, 0, marg);
 115 }
 116
 117 void wxIndividualLayoutConstraint::Above(wxWindowBase *sibling, int marg)
 118 {
 119     Set(wxAbove, sibling, wxTop, 0, marg);
 120 }
 121
 122 void wxIndividualLayoutConstraint::Below(wxWindowBase *sibling, int marg)
 123 {
 124     Set(wxBelow, sibling, wxBottom, 0, marg);
 125 }
 126
 127 //
 128 // 'Same edge' alignment
 129 //
 130 void wxIndividualLayoutConstraint::SameAs(wxWindowBase *otherW, wxEdge edge, int marg)
 131 {
 132     Set(wxPercentOf, otherW, edge, 100, marg);
 133 }
 134
 135 // The edge is a percentage of the other window's edge
 136 void wxIndividualLayoutConstraint::PercentOf(wxWindowBase *otherW, wxEdge wh, int per)
 137 {
 138     Set(wxPercentOf, otherW, wh, per);
 139 }
 140
 141 //
 142 // Edge has absolute value
 143 //
 144 void wxIndividualLayoutConstraint::Absolute(int val)
 145 {
 146     value = val;
 147     relationship = wxAbsolute;
 148 }
 149
 150 // Reset constraint if it mentions otherWin
 151 bool wxIndividualLayoutConstraint::ResetIfWin(wxWindowBase *otherW)
 152 {
 153     if (otherW == otherWin)
 154     {
 155         myEdge = wxTop;
 156         relationship = wxAsIs;
 157         margin = 0;
 158         value = 0;
 159         percent = 0;
 160         otherEdge = wxTop;
 161         otherWin = NULL;
 162         return true;
 163     }
 164
 165     return false;
 166 }
 167
 168 // Try to satisfy constraint
 169 bool wxIndividualLayoutConstraint::SatisfyConstraint(wxLayoutConstraints *constraints, wxWindowBase *win)
 170 {
 171     if (relationship == wxAbsolute)
 172     {
 173         done = true;
 174         return true;
 175     }
 176
 177     switch (myEdge)
 178     {
 179         case wxLeft:
 180         {
 181             switch (relationship)
 182             {
 183                 case wxLeftOf:
 184                 {
 185                     // We can know this edge if: otherWin is win's
 186                     // parent, or otherWin has a satisfied constraint,
 187                     // or otherWin has no constraint.
 188                     int edgePos = GetEdge(otherEdge, win, otherWin);
 189                     if (edgePos != -1)
 190                     {
 191                         value = edgePos - margin;
 192                         done = true;
 193                         return true;
 194                     }
 195                     else
 196                         return false;
 197                 }
 198                 case wxRightOf:
 199                 {
 200                     int edgePos = GetEdge(otherEdge, win, otherWin);
 201                     if (edgePos != -1)
 202                     {
 203                         value = edgePos + margin;
 204                         done = true;
 205                         return true;
 206                     }
 207                     else
 208                         return false;
 209                 }
 210                 case wxPercentOf:
 211                 {
 212                     int edgePos = GetEdge(otherEdge, win, otherWin);
 213                     if (edgePos != -1)
 214                     {
 215                         value = (int)(edgePos*(((float)percent)*0.01) + margin);
 216                         done = true;
 217                         return true;
 218                     }
 219                     else
 220                         return false;
 221                 }
 222                 case wxUnconstrained:
 223                 {
 224                     // We know the left-hand edge position if we know
 225                     // the right-hand edge and we know the width; OR if
 226                     // we know the centre and the width.
 227                     if (constraints->right.GetDone() && constraints->width.GetDone())
 228                     {
 229                         value = (constraints->right.GetValue() - constraints->width.GetValue() + margin);
 230                         done = true;
 231                         return true;
 232                     }
 233                     else if (constraints->centreX.GetDone() && constraints->width.GetDone())
 234                     {
 235                         value = (int)(constraints->centreX.GetValue() - (constraints->width.GetValue()/2) + margin);
 236                         done = true;
 237                         return true;
 238                     }
 239                     else
 240                         return false;
 241                 }
 242                 case wxAsIs:
 243                 {
 244                     int y;
 245                     win->GetPosition(&value, &y);
 246                     done = true;
 247                     return true;
 248                 }
 249                 default:
 250                     break;
 251             }
 252             break;
 253         }
 254         case wxRight:
 255         {
 256             switch (relationship)
 257             {
 258                 case wxLeftOf:
 259                 {
 260                     // We can know this edge if: otherWin is win's
 261                     // parent, or otherWin has a satisfied constraint,
 262                     // or otherWin has no constraint.
 263                     int edgePos = GetEdge(otherEdge, win, otherWin);
 264                     if (edgePos != -1)
 265                     {
 266                         value = edgePos - margin;
 267                         done = true;
 268                         return true;
 269                     }
 270                     else
 271                         return false;
 272                 }
 273                 case wxRightOf:
 274                 {
 275                     int edgePos = GetEdge(otherEdge, win, otherWin);
 276                     if (edgePos != -1)
 277                     {
 278                         value = edgePos + margin;
 279                         done = true;
 280                         return true;
 281                     }
 282                     else
 283                         return false;
 284                 }
 285                 case wxPercentOf:
 286                 {
 287                     int edgePos = GetEdge(otherEdge, win, otherWin);
 288                     if (edgePos != -1)
 289                     {
 290                         value = (int)(edgePos*(((float)percent)*0.01) - margin);
 291                         done = true;
 292                         return true;
 293                     }
 294                     else
 295                         return false;
 296                 }
 297                 case wxUnconstrained:
 298                 {
 299                     // We know the right-hand edge position if we know the
 300                     // left-hand edge and we know the width, OR if we know the
 301                     // centre edge and the width.
 302                     if (constraints->left.GetDone() && constraints->width.GetDone())
 303                     {
 304                         value = (constraints->left.GetValue() + constraints->width.GetValue() - margin);
 305                         done = true;
 306                         return true;
 307                     }
 308                     else if (constraints->centreX.GetDone() && constraints->width.GetDone())
 309                     {
 310                         value = (int)(constraints->centreX.GetValue() + (constraints->width.GetValue()/2) - margin);
 311                         done = true;
 312                         return true;
 313                     }
 314                     else
 315                         return false;
 316                 }
 317                 case wxAsIs:
 318                 {
 319                     int x, y;
 320                     int w, h;
 321                     wxGetAsIs(win, &w, &h);
 322                     win->GetPosition(&x, &y);
 323                     value = x + w;
 324                     done = true;
 325                     return true;
 326                 }
 327                 default:
 328                     break;
 329             }
 330             break;
 331         }
 332         case wxTop:
 333         {
 334             switch (relationship)
 335             {
 336                 case wxAbove:
 337                 {
 338                     // We can know this edge if: otherWin is win's
 339                     // parent, or otherWin has a satisfied constraint,
 340                     // or otherWin has no constraint.
 341                     int edgePos = GetEdge(otherEdge, win, otherWin);
 342                     if (edgePos != -1)
 343                     {
 344                         value = edgePos - margin;
 345                         done = true;
 346                         return true;
 347                     }
 348                     else
 349                         return false;
 350                 }
 351                 case wxBelow:
 352                 {
 353                     int edgePos = GetEdge(otherEdge, win, otherWin);
 354                     if (edgePos != -1)
 355                     {
 356                         value = edgePos + margin;
 357                         done = true;
 358                         return true;
 359                     }
 360                     else
 361                         return false;
 362                 }
 363                 case wxPercentOf:
 364                 {
 365                     int edgePos = GetEdge(otherEdge, win, otherWin);
 366                     if (edgePos != -1)
 367                     {
 368                         value = (int)(edgePos*(((float)percent)*0.01) + margin);
 369                         done = true;
 370                         return true;
 371                     }
 372                     else
 373                         return false;
 374                 }
 375                 case wxUnconstrained:
 376                 {
 377                     // We know the top edge position if we know the bottom edge
 378                     // and we know the height; OR if we know the centre edge and
 379                     // the height.
 380                     if (constraints->bottom.GetDone() && constraints->height.GetDone())
 381                     {
 382                         value = (constraints->bottom.GetValue() - constraints->height.GetValue() + margin);
 383                         done = true;
 384                         return true;
 385                     }
 386                     else if (constraints->centreY.GetDone() && constraints->height.GetDone())
 387                     {
 388                         value = (constraints->centreY.GetValue() - (constraints->height.GetValue()/2) + margin);
 389                         done = true;
 390                         return true;
 391                     }
 392                     else
 393                         return false;
 394                 }
 395                 case wxAsIs:
 396                 {
 397                     int x;
 398                     win->GetPosition(&x, &value);
 399                     done = true;
 400                     return true;
 401                 }
 402                 default:
 403                     break;
 404             }
 405             break;
 406         }
 407         case wxBottom:
 408         {
 409             switch (relationship)
 410             {
 411                 case wxAbove:
 412                 {
 413                     // We can know this edge if: otherWin is win's parent,
 414                     // or otherWin has a satisfied constraint, or
 415                     // otherWin has no constraint.
 416                     int edgePos = GetEdge(otherEdge, win, otherWin);
 417                     if (edgePos != -1)
 418                     {
 419                         value = edgePos + margin;
 420                         done = true;
 421                         return true;
 422                     }
 423                     else
 424                         return false;
 425                 }
 426                 case wxBelow:
 427                 {
 428                     int edgePos = GetEdge(otherEdge, win, otherWin);
 429                     if (edgePos != -1)
 430                     {
 431                         value = edgePos - margin;
 432                         done = true;
 433                         return true;
 434                     }
 435                     else
 436                         return false;
 437                 }
 438                 case wxPercentOf:
 439                 {
 440                     int edgePos = GetEdge(otherEdge, win, otherWin);
 441                     if (edgePos != -1)
 442                     {
 443                         value = (int)(edgePos*(((float)percent)*0.01) - margin);
 444                         done = true;
 445                         return true;
 446                     }
 447                     else
 448                         return false;
 449                 }
 450                 case wxUnconstrained:
 451                 {
 452                     // We know the bottom edge position if we know the top edge
 453                     // and we know the height; OR if we know the centre edge and
 454                     // the height.
 455                     if (constraints->top.GetDone() && constraints->height.GetDone())
 456                     {
 457                         value = (constraints->top.GetValue() + constraints->height.GetValue() - margin);
 458                         done = true;
 459                         return true;
 460                     }
 461                     else if (constraints->centreY.GetDone() && constraints->height.GetDone())
 462                     {
 463                         value = (constraints->centreY.GetValue() + (constraints->height.GetValue()/2) - margin);
 464                         done = true;
 465                         return true;
 466                     }
 467                     else
 468                         return false;
 469                 }
 470                 case wxAsIs:
 471                 {
 472                     int x, y;
 473                     int w, h;
 474                     wxGetAsIs(win, &w, &h);
 475                     win->GetPosition(&x, &y);
 476                     value = h + y;
 477                     done = true;
 478                     return true;
 479                 }
 480                 default:
 481                     break;
 482             }
 483             break;
 484         }
 485         case wxCentreX:
 486         {
 487             switch (relationship)
 488             {
 489                 case wxLeftOf:
 490                 {
 491                     // We can know this edge if: otherWin is win's parent, or
 492                     // otherWin has a satisfied constraint, or otherWin has no
 493                     // constraint.
 494                     int edgePos = GetEdge(otherEdge, win, otherWin);
 495                     if (edgePos != -1)
 496                     {
 497                         value = edgePos - margin;
 498                         done = true;
 499                         return true;
 500                     }
 501                     else
 502                         return false;
 503                 }
 504                 case wxRightOf:
 505                 {
 506                     int edgePos = GetEdge(otherEdge, win, otherWin);
 507                     if (edgePos != -1)
 508                     {
 509                         value = edgePos + margin;
 510                         done = true;
 511                         return true;
 512                     }
 513                     else
 514                         return false;
 515                 }
 516                 case wxPercentOf:
 517                 {
 518                     int edgePos = GetEdge(otherEdge, win, otherWin);
 519                     if (edgePos != -1)
 520                     {
 521                         value = (int)(edgePos*(((float)percent)*0.01) + margin);
 522                         done = true;
 523                         return true;
 524                     }
 525                     else
 526                         return false;
 527                 }
 528                 case wxUnconstrained:
 529                 {
 530                     // We know the centre position if we know
 531                     // the left-hand edge and we know the width, OR
 532                     // the right-hand edge and the width
 533                     if (constraints->left.GetDone() && constraints->width.GetDone())
 534                     {
 535                         value = (int)(constraints->left.GetValue() + (constraints->width.GetValue()/2) + margin);
 536                         done = true;
 537                         return true;
 538                     }
 539                     else if (constraints->right.GetDone() && constraints->width.GetDone())
 540                     {
 541                         value = (int)(constraints->left.GetValue() - (constraints->width.GetValue()/2) + margin);
 542                         done = true;
 543                         return true;
 544                     }
 545                     else
 546                         return false;
 547                 }
 548                 default:
 549                     break;
 550             }
 551             break;
 552         }
 553         case wxCentreY:
 554         {
 555             switch (relationship)
 556             {
 557                 case wxAbove:
 558                 {
 559                     // We can know this edge if: otherWin is win's parent,
 560                     // or otherWin has a satisfied constraint, or otherWin
 561                     // has no constraint.
 562                     int edgePos = GetEdge(otherEdge, win, otherWin);
 563                     if (edgePos != -1)
 564                     {
 565                         value = edgePos - margin;
 566                         done = true;
 567                         return true;
 568                     }
 569                     else
 570                         return false;
 571                 }
 572                 case wxBelow:
 573                 {
 574                     int edgePos = GetEdge(otherEdge, win, otherWin);
 575                     if (edgePos != -1)
 576                     {
 577                         value = edgePos + margin;
 578                         done = true;
 579                         return true;
 580                     }
 581                     else
 582                         return false;
 583                 }
 584                 case wxPercentOf:
 585                 {
 586                     int edgePos = GetEdge(otherEdge, win, otherWin);
 587                     if (edgePos != -1)
 588                     {
 589                         value = (int)(edgePos*(((float)percent)*0.01) + margin);
 590                         done = true;
 591                         return true;
 592                     }
 593                     else
 594                         return false;
 595                 }
 596                 case wxUnconstrained:
 597                 {
 598                     // We know the centre position if we know
 599                     // the top edge and we know the height, OR
 600                     // the bottom edge and the height.
 601                     if (constraints->bottom.GetDone() && constraints->height.GetDone())
 602                     {
 603                         value = (int)(constraints->bottom.GetValue() - (constraints->height.GetValue()/2) + margin);
 604                         done = true;
 605                         return true;
 606                     }
 607                     else if (constraints->top.GetDone() && constraints->height.GetDone())
 608                     {
 609                         value = (int)(constraints->top.GetValue() + (constraints->height.GetValue()/2) + margin);
 610                         done = true;
 611                         return true;
 612                     }
 613                     else
 614                         return false;
 615                 }
 616                 default:
 617                     break;
 618             }
 619             break;
 620         }
 621         case wxWidth:
 622         {
 623             switch (relationship)
 624             {
 625                 case wxPercentOf:
 626                 {
 627                     int edgePos = GetEdge(otherEdge, win, otherWin);
 628                     if (edgePos != -1)
 629                     {
 630                         value = (int)(edgePos*(((float)percent)*0.01));
 631                         done = true;
 632                         return true;
 633                     }
 634                     else
 635                         return false;
 636                 }
 637                 case wxAsIs:
 638                 {
 639                     if (win)
 640                     {
 641                         int h;
 642                         wxGetAsIs(win, &value, &h);
 643                         done = true;
 644                         return true;
 645                     }
 646                     else return false;
 647                 }
 648                 case wxUnconstrained:
 649                 {
 650                     // We know the width if we know the left edge and the right edge, OR
 651                     // if we know the left edge and the centre, OR
 652                     // if we know the right edge and the centre
 653                     if (constraints->left.GetDone() && constraints->right.GetDone())
 654                     {
 655                         value = constraints->right.GetValue() - constraints->left.GetValue();
 656                         done = true;
 657                         return true;
 658                     }
 659                     else if (constraints->centreX.GetDone() && constraints->left.GetDone())
 660                     {
 661                         value = (int)(2*(constraints->centreX.GetValue() - constraints->left.GetValue()));
 662                         done = true;
 663                         return true;
 664                     }
 665                     else if (constraints->centreX.GetDone() && constraints->right.GetDone())
 666                     {
 667                         value = (int)(2*(constraints->right.GetValue() - constraints->centreX.GetValue()));
 668                         done = true;
 669                         return true;
 670                     }
 671                     else
 672                         return false;
 673                 }
 674                 default:
 675                     break;
 676             }
 677             break;
 678         }
 679         case wxHeight:
 680         {
 681             switch (relationship)
 682             {
 683                 case wxPercentOf:
 684                 {
 685                     int edgePos = GetEdge(otherEdge, win, otherWin);
 686                     if (edgePos != -1)
 687                     {
 688                         value = (int)(edgePos*(((float)percent)*0.01));
 689                         done = true;
 690                         return true;
 691                     }
 692                     else
 693                         return false;
 694                 }
 695                 case wxAsIs:
 696                 {
 697                     if (win)
 698                     {
 699                         int w;
 700                         wxGetAsIs(win, &w, &value);
 701                         done = true;
 702                         return true;
 703                     }
 704                     else return false;
 705                 }
 706                 case wxUnconstrained:
 707                 {
 708                     // We know the height if we know the top edge and the bottom edge, OR
 709                     // if we know the top edge and the centre, OR
 710                     // if we know the bottom edge and the centre
 711                     if (constraints->top.GetDone() && constraints->bottom.GetDone())
 712                     {
 713                         value = constraints->bottom.GetValue() - constraints->top.GetValue();
 714                         done = true;
 715                         return true;
 716                     }
 717                     else if (constraints->top.GetDone() && constraints->centreY.GetDone())
 718                     {
 719                         value = (int)(2*(constraints->centreY.GetValue() - constraints->top.GetValue()));
 720                         done = true;
 721                         return true;
 722                     }
 723                     else if (constraints->bottom.GetDone() && constraints->centreY.GetDone())
 724                     {
 725                         value = (int)(2*(constraints->bottom.GetValue() - constraints->centreY.GetValue()));
 726                         done = true;
 727                         return true;
 728                     }
 729                     else
 730                         return false;
 731                 }
 732                 default:
 733                     break;
 734             }
 735             break;
 736         }
 737         default:
 738             break;
 739     }
 740     return false;
 741 }
 742
 743 // Get the value of this edge or dimension, or if this is not determinable, -1.
 744 int wxIndividualLayoutConstraint::GetEdge(wxEdge which,
 745                                           wxWindowBase *thisWin,
 746                                           wxWindowBase *other) const
 747 {
 748     // If the edge or dimension belongs to the parent, then we know the
 749     // dimension is obtainable immediately. E.g. a wxExpandSizer may contain a
 750     // button (but the button's true parent is a panel, not the sizer)
 751     if (other->GetChildren().Find((wxWindow*)thisWin))
 752     {
 753         switch (which)
 754         {
 755             case wxLeft:
 756                 {
 757                     return 0;
 758                 }
 759             case wxTop:
 760                 {
 761                     return 0;
 762                 }
 763             case wxRight:
 764                 {
 765                     int w, h;
 766                     other->GetClientSizeConstraint(&w, &h);
 767                     return w;
 768                 }
 769             case wxBottom:
 770                 {
 771                     int w, h;
 772                     other->GetClientSizeConstraint(&w, &h);
 773                     return h;
 774                 }
 775             case wxWidth:
 776                 {
 777                     int w, h;
 778                     other->GetClientSizeConstraint(&w, &h);
 779                     return w;
 780                 }
 781             case wxHeight:
 782                 {
 783                     int w, h;
 784                     other->GetClientSizeConstraint(&w, &h);
 785                     return h;
 786                 }
 787             case wxCentreX:
 788             case wxCentreY:
 789                 {
 790                     int w, h;
 791                     other->GetClientSizeConstraint(&w, &h);
 792                     if (which == wxCentreX)
 793                         return (int)(w/2);
 794                     else
 795                         return (int)(h/2);
 796                 }
 797             default:
 798                 return -1;
 799         }
 800     }
 801     switch (which)
 802     {
 803         case wxLeft:
 804             {
 805                 wxLayoutConstraints *constr = other->GetConstraints();
 806                 // If no constraints, it means the window is not dependent
 807                 // on anything, and therefore we know its value immediately
 808                 if (constr)
 809                 {
 810                     if (constr->left.GetDone())
 811                         return constr->left.GetValue();
 812                     else
 813                         return -1;
 814                 }
 815                 else
 816                 {
 817                     int x, y;
 818                     other->GetPosition(&x, &y);
 819                     return x;
 820                 }
 821             }
 822         case wxTop:
 823             {
 824                 wxLayoutConstraints *constr = other->GetConstraints();
 825                 // If no constraints, it means the window is not dependent
 826                 // on anything, and therefore we know its value immediately
 827                 if (constr)
 828                 {
 829                     if (constr->top.GetDone())
 830                         return constr->top.GetValue();
 831                     else
 832                         return -1;
 833                 }
 834                 else
 835                 {
 836                     int x, y;
 837                     other->GetPosition(&x, &y);
 838                     return y;
 839                 }
 840             }
 841         case wxRight:
 842             {
 843                 wxLayoutConstraints *constr = other->GetConstraints();
 844                 // If no constraints, it means the window is not dependent
 845                 // on anything, and therefore we know its value immediately
 846                 if (constr)
 847                 {
 848                     if (constr->right.GetDone())
 849                         return constr->right.GetValue();
 850                     else
 851                         return -1;
 852                 }
 853                 else
 854                 {
 855                     int x, y, w, h;
 856                     other->GetPosition(&x, &y);
 857                     other->GetSize(&w, &h);
 858                     return (int)(x + w);
 859                 }
 860             }
 861         case wxBottom:
 862             {
 863                 wxLayoutConstraints *constr = other->GetConstraints();
 864                 // If no constraints, it means the window is not dependent
 865                 // on anything, and therefore we know its value immediately
 866                 if (constr)
 867                 {
 868                     if (constr->bottom.GetDone())
 869                         return constr->bottom.GetValue();
 870                     else
 871                         return -1;
 872                 }
 873                 else
 874                 {
 875                     int x, y, w, h;
 876                     other->GetPosition(&x, &y);
 877                     other->GetSize(&w, &h);
 878                     return (int)(y + h);
 879                 }
 880             }
 881         case wxWidth:
 882             {
 883                 wxLayoutConstraints *constr = other->GetConstraints();
 884                 // If no constraints, it means the window is not dependent
 885                 // on anything, and therefore we know its value immediately
 886                 if (constr)
 887                 {
 888                     if (constr->width.GetDone())
 889                         return constr->width.GetValue();
 890                     else
 891                         return -1;
 892                 }
 893                 else
 894                 {
 895                     int w, h;
 896                     other->GetSize(&w, &h);
 897                     return w;
 898                 }
 899             }
 900         case wxHeight:
 901             {
 902                 wxLayoutConstraints *constr = other->GetConstraints();
 903                 // If no constraints, it means the window is not dependent
 904                 // on anything, and therefore we know its value immediately
 905                 if (constr)
 906                 {
 907                     if (constr->height.GetDone())
 908                         return constr->height.GetValue();
 909                     else
 910                         return -1;
 911                 }
 912                 else
 913                 {
 914                     int w, h;
 915                     other->GetSize(&w, &h);
 916                     return h;
 917                 }
 918             }
 919         case wxCentreX:
 920             {
 921                 wxLayoutConstraints *constr = other->GetConstraints();
 922                 // If no constraints, it means the window is not dependent
 923                 // on anything, and therefore we know its value immediately
 924                 if (constr)
 925                 {
 926                     if (constr->centreX.GetDone())
 927                         return constr->centreX.GetValue();
 928                     else
 929                         return -1;
 930                 }
 931                 else
 932                 {
 933                     int x, y, w, h;
 934                     other->GetPosition(&x, &y);
 935                     other->GetSize(&w, &h);
 936                     return (int)(x + (w/2));
 937                 }
 938             }
 939         case wxCentreY:
 940             {
 941                 wxLayoutConstraints *constr = other->GetConstraints();
 942                 // If no constraints, it means the window is not dependent
 943                 // on anything, and therefore we know its value immediately
 944                 if (constr)
 945                 {
 946                     if (constr->centreY.GetDone())
 947                         return constr->centreY.GetValue();
 948                     else
 949                         return -1;
 950                 }
 951                 else
 952                 {
 953                     int x, y, w, h;
 954                     other->GetPosition(&x, &y);
 955                     other->GetSize(&w, &h);
 956                     return (int)(y + (h/2));
 957                 }
 958             }
 959         default:
 960             break;
 961     }
 962     return -1;
 963 }
 964
 965 wxLayoutConstraints::wxLayoutConstraints()
 966 {
 967     left.SetEdge(wxLeft);
 968     top.SetEdge(wxTop);
 969     right.SetEdge(wxRight);
 970     bottom.SetEdge(wxBottom);
 971     centreX.SetEdge(wxCentreX);
 972     centreY.SetEdge(wxCentreY);
 973     width.SetEdge(wxWidth);
 974     height.SetEdge(wxHeight);
 975 }
 976
 977 bool wxLayoutConstraints::SatisfyConstraints(wxWindowBase *win, int *nChanges)
 978 {
 979     int noChanges = 0;
 980
 981     bool done = width.GetDone();
 982     bool newDone = (done ? true : width.SatisfyConstraint(this, win));
 983     if (newDone != done)
 984         noChanges ++;
 985
 986     done = height.GetDone();
 987     newDone = (done ? true : height.SatisfyConstraint(this, win));
 988     if (newDone != done)
 989         noChanges ++;
 990
 991     done = left.GetDone();
 992     newDone = (done ? true : left.SatisfyConstraint(this, win));
 993     if (newDone != done)
 994         noChanges ++;
 995
 996     done = top.GetDone();
 997     newDone = (done ? true : top.SatisfyConstraint(this, win));
 998     if (newDone != done)
 999         noChanges ++;
1000
1001     done = right.GetDone();
1002     newDone = (done ? true : right.SatisfyConstraint(this, win));
1003     if (newDone != done)
1004         noChanges ++;
1005
1006     done = bottom.GetDone();
1007     newDone = (done ? true : bottom.SatisfyConstraint(this, win));
1008     if (newDone != done)
1009         noChanges ++;
1010
1011     done = centreX.GetDone();
1012     newDone = (done ? true : centreX.SatisfyConstraint(this, win));
1013     if (newDone != done)
1014         noChanges ++;
1015
1016     done = centreY.GetDone();
1017     newDone = (done ? true : centreY.SatisfyConstraint(this, win));
1018     if (newDone != done)
1019         noChanges ++;
1020
1021     *nChanges = noChanges;
1022
1023     return AreSatisfied();
1024 }
1025
1026 #endif // wxUSE_CONSTRAINTS