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