src/common/gbsizer.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        gbsizer.cpp
   3 // Purpose:     wxGridBagSizer:  A sizer that can lay out items in a grid,
   4 //              with items at specified cells, and with the option of row
   5 //              and/or column spanning
   6 //
   7 // Author:      Robin Dunn
   8 // Created:     03-Nov-2003
   9 // RCS-ID:      $Id$
  10 // Copyright:   (c) Robin Dunn
  11 // Licence:     wxWindows licence
  12 /////////////////////////////////////////////////////////////////////////////
  13
  14 // For compilers that support precompilation, includes "wx.h".
  15 #include "wx/wxprec.h"
  16
  17 #ifdef __BORLANDC__
  18     #pragma hdrstop
  19 #endif
  20
  21 #include "wx/gbsizer.h"
  22
  23 //---------------------------------------------------------------------------
  24
  25 IMPLEMENT_DYNAMIC_CLASS(wxGBSizerItem, wxSizerItem)
  26 IMPLEMENT_CLASS(wxGridBagSizer, wxFlexGridSizer)
  27
  28 const wxGBSpan wxDefaultSpan;
  29
  30 //---------------------------------------------------------------------------
  31 // wxGBSizerItem
  32 //---------------------------------------------------------------------------
  33
  34 wxGBSizerItem::wxGBSizerItem( int width,
  35                               int height,
  36                               const wxGBPosition& pos,
  37                               const wxGBSpan& span,
  38                               int flag,
  39                               int border,
  40                               wxObject* userData)
  41     : wxSizerItem(width, height, 0, flag, border, userData),
  42       m_pos(pos),
  43       m_span(span),
  44       m_gbsizer(NULL)
  45 {
  46 }
  47
  48
  49 wxGBSizerItem::wxGBSizerItem( wxWindow *window,
  50                               const wxGBPosition& pos,
  51                               const wxGBSpan& span,
  52                               int flag,
  53                               int border,
  54                               wxObject* userData )
  55     : wxSizerItem(window, 0, flag, border, userData),
  56       m_pos(pos),
  57       m_span(span),
  58       m_gbsizer(NULL)
  59 {
  60 }
  61
  62
  63 wxGBSizerItem::wxGBSizerItem( wxSizer *sizer,
  64                               const wxGBPosition& pos,
  65                               const wxGBSpan& span,
  66                               int flag,
  67                               int border,
  68                               wxObject* userData )
  69     : wxSizerItem(sizer, 0, flag, border, userData),
  70       m_pos(pos),
  71       m_span(span),
  72       m_gbsizer(NULL)
  73 {
  74 }
  75
  76 wxGBSizerItem::wxGBSizerItem()
  77     : wxSizerItem(),
  78       m_pos(-1,-1),
  79       m_span(-1,-1),
  80       m_gbsizer(NULL)
  81 {
  82 }
  83
  84 //---------------------------------------------------------------------------
  85
  86
  87 void wxGBSizerItem::GetPos(int& row, int& col) const
  88 {
  89     row = m_pos.GetRow();
  90     col = m_pos.GetCol();
  91 }
  92
  93 void wxGBSizerItem::GetSpan(int& rowspan, int& colspan) const
  94 {
  95     rowspan = m_span.GetRowspan();
  96     colspan = m_span.GetColspan();
  97 }
  98
  99
 100 bool wxGBSizerItem::SetPos( const wxGBPosition& pos )
 101 {
 102     if (m_gbsizer)
 103     {
 104         wxCHECK_MSG( !m_gbsizer->CheckForIntersection(pos, m_span, this), false,
 105                  wxT("An item is already at that position") );
 106     }
 107     m_pos = pos;
 108     return true;
 109 }
 110
 111 bool wxGBSizerItem::SetSpan( const wxGBSpan& span )
 112 {
 113     if (m_gbsizer)
 114     {
 115         wxCHECK_MSG( !m_gbsizer->CheckForIntersection(m_pos, span, this), false,
 116                  wxT("An item is already at that position") );
 117     }
 118     m_span = span;
 119     return true;
 120 }
 121
 122
 123 inline bool InRange(int val, int min, int max)
 124 {
 125     return (val >= min && val <= max);
 126 }
 127
 128 bool wxGBSizerItem::Intersects(const wxGBSizerItem& other)
 129 {
 130     return Intersects(other.GetPos(), other.GetSpan());
 131 }
 132
 133 bool wxGBSizerItem::Intersects(const wxGBPosition& pos, const wxGBSpan& span)
 134 {
 135
 136     int row, col, endrow, endcol;
 137     int otherrow, othercol, otherendrow, otherendcol;
 138
 139     GetPos(row, col);
 140     GetEndPos(endrow, endcol);
 141
 142     otherrow = pos.GetRow();
 143     othercol = pos.GetCol();
 144     otherendrow = otherrow + span.GetRowspan() - 1;
 145     otherendcol = othercol + span.GetColspan() - 1;
 146
 147     // is the other item's start or end in the range of this one?
 148     if (( InRange(otherrow, row, endrow) && InRange(othercol, col, endcol) ) ||
 149         ( InRange(otherendrow, row, endrow) && InRange(otherendcol, col, endcol) ))
 150         return true;
 151
 152     // is this item's start or end in the range of the other one?
 153     if (( InRange(row, otherrow, otherendrow) && InRange(col, othercol, otherendcol) ) ||
 154         ( InRange(endrow, otherrow, otherendrow) && InRange(endcol, othercol, otherendcol) ))
 155         return true;
 156
 157     return false;
 158 }
 159
 160
 161 void wxGBSizerItem::GetEndPos(int& row, int& col)
 162 {
 163     row = m_pos.GetRow() + m_span.GetRowspan() - 1;
 164     col = m_pos.GetCol() + m_span.GetColspan() - 1;
 165 }
 166
 167
 168 //---------------------------------------------------------------------------
 169 // wxGridBagSizer
 170 //---------------------------------------------------------------------------
 171
 172 wxGridBagSizer::wxGridBagSizer(int vgap, int hgap )
 173     : wxFlexGridSizer(1, vgap, hgap),
 174       m_emptyCellSize(10,20)
 175
 176 {
 177 }
 178
 179
 180 wxSizerItem* wxGridBagSizer::Add( wxWindow *window,
 181                                   const wxGBPosition& pos, const wxGBSpan& span,
 182                                   int flag, int border,  wxObject* userData )
 183 {
 184     wxGBSizerItem* item = new wxGBSizerItem(window, pos, span, flag, border, userData);
 185     if ( Add(item) )
 186         return item;
 187     else
 188     {
 189         delete item;
 190         return (wxSizerItem*)NULL;
 191     }
 192 }
 193
 194 wxSizerItem* wxGridBagSizer::Add( wxSizer *sizer,
 195                           const wxGBPosition& pos, const wxGBSpan& span,
 196                           int flag, int border,  wxObject* userData )
 197 {
 198     wxGBSizerItem* item = new wxGBSizerItem(sizer, pos, span, flag, border, userData);
 199     if ( Add(item) )
 200         return item;
 201     else
 202     {
 203         delete item;
 204         return (wxSizerItem*)NULL;
 205     }
 206 }
 207
 208 wxSizerItem* wxGridBagSizer::Add( int width, int height,
 209                           const wxGBPosition& pos, const wxGBSpan& span,
 210                           int flag, int border,  wxObject* userData )
 211 {
 212     wxGBSizerItem* item = new wxGBSizerItem(width, height, pos, span, flag, border, userData);
 213     if ( Add(item) )
 214         return item;
 215     else
 216     {
 217         delete item;
 218         return (wxSizerItem*)NULL;
 219     }
 220 }
 221
 222 wxSizerItem* wxGridBagSizer::Add( wxGBSizerItem *item )
 223 {
 224     wxCHECK_MSG( !CheckForIntersection(item), NULL,
 225                  wxT("An item is already at that position") );
 226     m_children.Append(item);
 227     item->SetGBSizer(this);
 228     if ( item->GetWindow() )
 229         item->GetWindow()->SetContainingSizer( this );
 230
 231     // extend the number of rows/columns of the underlying wxFlexGridSizer if
 232     // necessary
 233     int row, col;
 234     item->GetEndPos(row, col);
 235     row++;
 236     col++;
 237
 238     if ( row > GetRows() )
 239         SetRows(row);
 240     if ( col > GetCols() )
 241         SetCols(col);
 242
 243     return item;
 244 }
 245
 246
 247
 248 //---------------------------------------------------------------------------
 249
 250 wxSize wxGridBagSizer::GetCellSize(int row, int col) const
 251 {
 252     wxCHECK_MSG( (row < m_rows) && (col < m_cols),
 253                  wxDefaultSize,
 254                  wxT("Invalid cell."));
 255     return wxSize( m_colWidths[col], m_rowHeights[row] );
 256 }
 257
 258
 259 wxGBPosition wxGridBagSizer::GetItemPosition(wxWindow *window)
 260 {
 261     wxGBPosition badpos(-1,-1);
 262     wxGBSizerItem* item = FindItem(window);
 263     wxCHECK_MSG(item, badpos, wxT("Failed to find item."));
 264     return item->GetPos();
 265 }
 266
 267
 268 wxGBPosition wxGridBagSizer::GetItemPosition(wxSizer *sizer)
 269 {
 270     wxGBPosition badpos(-1,-1);
 271     wxGBSizerItem* item = FindItem(sizer);
 272     wxCHECK_MSG(item, badpos, wxT("Failed to find item."));
 273     return item->GetPos();
 274 }
 275
 276
 277 wxGBPosition wxGridBagSizer::GetItemPosition(size_t index)
 278 {
 279     wxGBPosition badpos(-1,-1);
 280     wxSizerItemList::compatibility_iterator node = m_children.Item( index );
 281     wxCHECK_MSG( node, badpos, _T("Failed to find item.") );
 282     wxGBSizerItem* item = (wxGBSizerItem*)node->GetData();
 283     return item->GetPos();
 284 }
 285
 286
 287
 288 bool wxGridBagSizer::SetItemPosition(wxWindow *window, const wxGBPosition& pos)
 289 {
 290     wxGBSizerItem* item = FindItem(window);
 291     wxCHECK_MSG(item, false, wxT("Failed to find item."));
 292     return item->SetPos(pos);
 293 }
 294
 295
 296 bool wxGridBagSizer::SetItemPosition(wxSizer *sizer, const wxGBPosition& pos)
 297 {
 298     wxGBSizerItem* item = FindItem(sizer);
 299     wxCHECK_MSG(item, false, wxT("Failed to find item."));
 300     return item->SetPos(pos);
 301 }
 302
 303
 304 bool wxGridBagSizer::SetItemPosition(size_t index, const wxGBPosition& pos)
 305 {
 306     wxSizerItemList::compatibility_iterator node = m_children.Item( index );
 307     wxCHECK_MSG( node, false, _T("Failed to find item.") );
 308     wxGBSizerItem* item = (wxGBSizerItem*)node->GetData();
 309     return item->SetPos(pos);
 310 }
 311
 312
 313
 314 wxGBSpan wxGridBagSizer::GetItemSpan(wxWindow *window)
 315 {
 316     wxGBSpan badspan(-1,-1);
 317     wxGBSizerItem* item = FindItem(window);
 318     wxCHECK_MSG( item, badspan, _T("Failed to find item.") );
 319     return item->GetSpan();
 320 }
 321
 322
 323 wxGBSpan wxGridBagSizer::GetItemSpan(wxSizer *sizer)
 324 {
 325     wxGBSpan badspan(-1,-1);
 326     wxGBSizerItem* item = FindItem(sizer);
 327     wxCHECK_MSG( item, badspan, _T("Failed to find item.") );
 328     return item->GetSpan();
 329 }
 330
 331
 332 wxGBSpan wxGridBagSizer::GetItemSpan(size_t index)
 333 {
 334     wxGBSpan badspan(-1,-1);
 335     wxSizerItemList::compatibility_iterator node = m_children.Item( index );
 336     wxCHECK_MSG( node, badspan, _T("Failed to find item.") );
 337     wxGBSizerItem* item = (wxGBSizerItem*)node->GetData();
 338     return item->GetSpan();
 339 }
 340
 341
 342
 343 bool wxGridBagSizer::SetItemSpan(wxWindow *window, const wxGBSpan& span)
 344 {
 345     wxGBSizerItem* item = FindItem(window);
 346     wxCHECK_MSG(item, false, wxT("Failed to find item."));
 347     return item->SetSpan(span);
 348 }
 349
 350
 351 bool wxGridBagSizer::SetItemSpan(wxSizer *sizer, const wxGBSpan& span)
 352 {
 353     wxGBSizerItem* item = FindItem(sizer);
 354     wxCHECK_MSG(item, false, wxT("Failed to find item."));
 355     return item->SetSpan(span);
 356 }
 357
 358
 359 bool wxGridBagSizer::SetItemSpan(size_t index, const wxGBSpan& span)
 360 {
 361     wxSizerItemList::compatibility_iterator node = m_children.Item( index );
 362     wxCHECK_MSG( node, false, _T("Failed to find item.") );
 363     wxGBSizerItem* item = (wxGBSizerItem*)node->GetData();
 364     return item->SetSpan(span);
 365 }
 366
 367
 368
 369
 370 wxGBSizerItem* wxGridBagSizer::FindItem(wxWindow* window)
 371 {
 372     wxSizerItemList::compatibility_iterator node = m_children.GetFirst();
 373     while (node)
 374     {
 375         wxGBSizerItem* item = (wxGBSizerItem*)node->GetData();
 376         if ( item->GetWindow() == window )
 377             return item;
 378         node = node->GetNext();
 379     }
 380     return NULL;
 381 }
 382
 383
 384 wxGBSizerItem* wxGridBagSizer::FindItem(wxSizer* sizer)
 385 {
 386     wxSizerItemList::compatibility_iterator node = m_children.GetFirst();
 387     while (node)
 388     {
 389         wxGBSizerItem* item = (wxGBSizerItem*)node->GetData();
 390         if ( item->GetSizer() == sizer )
 391             return item;
 392         node = node->GetNext();
 393     }
 394     return NULL;
 395 }
 396
 397
 398
 399
 400 wxGBSizerItem* wxGridBagSizer::FindItemAtPosition(const wxGBPosition& pos)
 401 {
 402     wxSizerItemList::compatibility_iterator node = m_children.GetFirst();
 403     while (node)
 404     {
 405         wxGBSizerItem* item = (wxGBSizerItem*)node->GetData();
 406         if ( item->Intersects(pos, wxDefaultSpan) )
 407             return item;
 408         node = node->GetNext();
 409     }
 410     return NULL;
 411 }
 412
 413
 414
 415
 416 wxGBSizerItem* wxGridBagSizer::FindItemAtPoint(const wxPoint& pt)
 417 {
 418     wxSizerItemList::compatibility_iterator node = m_children.GetFirst();
 419     while (node)
 420     {
 421         wxGBSizerItem* item = (wxGBSizerItem*)node->GetData();
 422         wxRect rect(item->GetPosition(), item->GetSize());
 423         rect.Inflate(m_hgap, m_vgap);
 424         if ( rect.Contains(pt) )
 425             return item;
 426         node = node->GetNext();
 427     }
 428     return NULL;
 429 }
 430
 431
 432
 433
 434 wxGBSizerItem* wxGridBagSizer::FindItemWithData(const wxObject* userData)
 435 {
 436     wxSizerItemList::compatibility_iterator node = m_children.GetFirst();
 437     while (node)
 438     {
 439         wxGBSizerItem* item = (wxGBSizerItem*)node->GetData();
 440         if ( item->GetUserData() == userData )
 441             return item;
 442         node = node->GetNext();
 443     }
 444     return NULL;
 445 }
 446
 447
 448
 449
 450 //---------------------------------------------------------------------------
 451
 452 // Figure out what all the min row heights and col widths are, and calculate
 453 // min size from that.
 454 wxSize wxGridBagSizer::CalcMin()
 455 {
 456     int idx;
 457
 458     if (m_children.GetCount() == 0)
 459         return m_emptyCellSize;
 460
 461     m_rowHeights.Empty();
 462     m_colWidths.Empty();
 463
 464     wxSizerItemList::compatibility_iterator node = m_children.GetFirst();
 465     while (node)
 466     {
 467         wxGBSizerItem* item = (wxGBSizerItem*)node->GetData();
 468         if ( item->IsShown() )
 469         {
 470             int row, col, endrow, endcol;
 471
 472             item->GetPos(row, col);
 473             item->GetEndPos(endrow, endcol);
 474
 475             // fill heights and widths upto this item if needed
 476             while ( m_rowHeights.GetCount() <= (size_t)endrow )
 477                 m_rowHeights.Add(m_emptyCellSize.GetHeight());
 478             while ( m_colWidths.GetCount() <= (size_t)endcol )
 479                 m_colWidths.Add(m_emptyCellSize.GetWidth());
 480
 481             // See if this item increases the size of its row(s) or col(s)
 482             wxSize size(item->CalcMin());
 483             for (idx=row; idx <= endrow; idx++)
 484                 m_rowHeights[idx] = wxMax(m_rowHeights[idx], size.GetHeight() / (endrow-row+1));
 485             for (idx=col; idx <= endcol; idx++)
 486                 m_colWidths[idx] = wxMax(m_colWidths[idx], size.GetWidth() / (endcol-col+1));
 487         }
 488         node = node->GetNext();
 489     }
 490
 491     AdjustForOverflow();
 492     AdjustForFlexDirection();
 493
 494     // Now traverse the heights and widths arrays calcing the totals, including gaps
 495     int width = 0;
 496     m_cols = m_colWidths.GetCount();
 497     for (idx=0; idx < m_cols; idx++)
 498         width += m_colWidths[idx] + ( idx == m_cols-1 ? 0 : m_hgap );
 499
 500     int height = 0;
 501     m_rows = m_rowHeights.GetCount();
 502     for (idx=0; idx < m_rows; idx++)
 503         height += m_rowHeights[idx] + ( idx == m_rows-1 ? 0 : m_vgap );
 504
 505     m_calculatedMinSize = wxSize(width, height);
 506     return m_calculatedMinSize;
 507 }
 508
 509
 510
 511 void wxGridBagSizer::RecalcSizes()
 512 {
 513     if (m_children.GetCount() == 0)
 514         return;
 515
 516     wxPoint pt( GetPosition() );
 517     wxSize  sz( GetSize() );
 518
 519     m_rows = m_rowHeights.GetCount();
 520     m_cols = m_colWidths.GetCount();
 521     int idx, width, height;
 522
 523     AdjustForGrowables(sz);
 524
 525     // Find the start positions on the window of the rows and columns
 526     wxArrayInt rowpos;
 527     rowpos.Add(0, m_rows);
 528     int y = pt.y;
 529     for (idx=0; idx < m_rows; idx++)
 530     {
 531         height = m_rowHeights[idx] + m_vgap;
 532         rowpos[idx] = y;
 533         y += height;
 534     }
 535
 536     wxArrayInt colpos;
 537     colpos.Add(0, m_cols);
 538     int x = pt.x;
 539     for (idx=0; idx < m_cols; idx++)
 540     {
 541         width = m_colWidths[idx] + m_hgap;
 542         colpos[idx] = x;
 543         x += width;
 544     }
 545
 546
 547     // Now iterate the children, setting each child's dimensions
 548     wxSizerItemList::compatibility_iterator node = m_children.GetFirst();
 549     while (node)
 550     {
 551         int row, col, endrow, endcol;
 552         wxGBSizerItem* item = (wxGBSizerItem*)node->GetData();
 553
 554         if ( item->IsShown() )
 555         {
 556             item->GetPos(row, col);
 557             item->GetEndPos(endrow, endcol);
 558
 559             height = 0;
 560             for(idx=row; idx <= endrow; idx++)
 561                 height += m_rowHeights[idx];
 562             height += (endrow - row) * m_vgap; // add a vgap for every row spanned
 563
 564             width = 0;
 565             for (idx=col; idx <= endcol; idx++)
 566                 width += m_colWidths[idx];
 567             width += (endcol - col) * m_hgap; // add a hgap for every col spanned
 568
 569             SetItemBounds(item, colpos[col], rowpos[row], width, height);
 570         }
 571
 572         node = node->GetNext();
 573     }
 574 }
 575
 576
 577 // Sometimes CalcMin can result in some rows or cols having too much space in
 578 // them because as it traverses the items it makes some assumptions when
 579 // items span to other cells.  But those assumptions can become invalid later
 580 // on when other items are fitted into the same rows or columns that the
 581 // spanning item occupies. This method tries to find those situations and
 582 // fixes them.
 583 void wxGridBagSizer::AdjustForOverflow()
 584 {
 585     int row, col;
 586
 587     for (row=0; row<(int)m_rowHeights.GetCount(); row++)
 588     {
 589         int rowExtra=INT_MAX;
 590         int rowHeight = m_rowHeights[row];
 591         for (col=0; col<(int)m_colWidths.GetCount(); col++)
 592         {
 593             wxGBPosition pos(row,col);
 594             wxGBSizerItem* item = FindItemAtPosition(pos);
 595             if ( !item || !item->IsShown() )
 596                 continue;
 597
 598             int endrow, endcol;
 599             item->GetEndPos(endrow, endcol);
 600
 601             // If the item starts in this position and doesn't span rows, then
 602             // just look at the whole item height
 603             if ( item->GetPos() == pos && endrow == row )
 604             {
 605                 int itemHeight = item->CalcMin().GetHeight();
 606                 rowExtra = wxMin(rowExtra, rowHeight - itemHeight);
 607                 continue;
 608             }
 609
 610             // Otherwise, only look at spanning items if they end on this row
 611             if ( endrow == row )
 612             {
 613                 // first deduct the portions of the item that are on prior rows
 614                 int itemHeight = item->CalcMin().GetHeight();
 615                 for (int r=item->GetPos().GetRow(); r<row; r++)
 616                     itemHeight -= (m_rowHeights[r] + GetHGap());
 617
 618                 if ( itemHeight < 0 )
 619                     itemHeight = 0;
 620
 621                 // and check how much is left
 622                 rowExtra = wxMin(rowExtra, rowHeight - itemHeight);
 623             }
 624         }
 625         if ( rowExtra && rowExtra != INT_MAX )
 626             m_rowHeights[row] -= rowExtra;
 627     }
 628
 629     // Now do the same thing for columns
 630     for (col=0; col<(int)m_colWidths.GetCount(); col++)
 631     {
 632         int colExtra=INT_MAX;
 633         int colWidth = m_colWidths[col];
 634         for (row=0; row<(int)m_rowHeights.GetCount(); row++)
 635         {
 636             wxGBPosition pos(row,col);
 637             wxGBSizerItem* item = FindItemAtPosition(pos);
 638             if ( !item || !item->IsShown() )
 639                 continue;
 640
 641             int endrow, endcol;
 642             item->GetEndPos(endrow, endcol);
 643
 644             if ( item->GetPos() == pos && endcol == col )
 645             {
 646                 int itemWidth = item->CalcMin().GetWidth();
 647                 colExtra = wxMin(colExtra, colWidth - itemWidth);
 648                 continue;
 649             }
 650
 651             if ( endcol == col )
 652             {
 653                 int itemWidth = item->CalcMin().GetWidth();
 654                 for (int c=item->GetPos().GetCol(); c<col; c++)
 655                     itemWidth -= (m_colWidths[c] + GetVGap());
 656
 657                 if ( itemWidth < 0 )
 658                     itemWidth = 0;
 659
 660                 colExtra = wxMin(colExtra, colWidth - itemWidth);
 661             }
 662         }
 663         if ( colExtra && colExtra != INT_MAX )
 664             m_colWidths[col] -= colExtra;
 665     }
 666
 667
 668 }
 669
 670 //---------------------------------------------------------------------------
 671
 672 bool wxGridBagSizer::CheckForIntersection(wxGBSizerItem* item, wxGBSizerItem* excludeItem)
 673 {
 674     return CheckForIntersection(item->GetPos(), item->GetSpan(), excludeItem);
 675 }
 676
 677 bool wxGridBagSizer::CheckForIntersection(const wxGBPosition& pos, const wxGBSpan& span, wxGBSizerItem* excludeItem)
 678 {
 679     wxSizerItemList::compatibility_iterator node = m_children.GetFirst();
 680     while (node)
 681     {
 682         wxGBSizerItem* item = (wxGBSizerItem*)node->GetData();
 683         node = node->GetNext();
 684
 685         if ( excludeItem && item == excludeItem )
 686             continue;
 687
 688         if ( item->Intersects(pos, span) )
 689             return true;
 690
 691     }
 692     return false;
 693 }
 694
 695
 696 // Assumes a 10x10 grid, and returns the first empty cell found.  This is
 697 // really stupid but it is only used by the Add methods that match the base
 698 // class virtuals, which should normally not be used anyway...
 699 wxGBPosition wxGridBagSizer::FindEmptyCell()
 700 {
 701     int row, col;
 702
 703     for (row=0; row<10; row++)
 704         for (col=0; col<10; col++)
 705         {
 706             wxGBPosition pos(row, col);
 707             if ( !CheckForIntersection(pos, wxDefaultSpan) )
 708                 return pos;
 709         }
 710     return wxGBPosition(-1, -1);
 711 }
 712
 713
 714 //---------------------------------------------------------------------------
 715
 716 // The Add base class virtuals should not be used with this class, but
 717 // we'll try to make them automatically select a location for the item
 718 // anyway.
 719
 720 wxSizerItem* wxGridBagSizer::Add( wxWindow *window, int, int flag, int border, wxObject* userData )
 721 {
 722     return Add(window, FindEmptyCell(), wxDefaultSpan, flag, border, userData);
 723 }
 724
 725 wxSizerItem* wxGridBagSizer::Add( wxSizer *sizer, int, int flag, int border, wxObject* userData )
 726 {
 727     return Add(sizer, FindEmptyCell(), wxDefaultSpan, flag, border, userData);
 728 }
 729
 730 wxSizerItem* wxGridBagSizer::Add( int width, int height, int, int flag, int border, wxObject* userData )
 731 {
 732     return Add(width, height, FindEmptyCell(), wxDefaultSpan, flag, border, userData);
 733 }
 734
 735
 736
 737 // The Insert nad Prepend base class virtuals that are not appropriate for
 738 // this class and should not be used.  Their implementation in this class
 739 // simply fails.
 740
 741 wxSizerItem* wxGridBagSizer::Add( wxSizerItem * )
 742 {
 743     wxFAIL_MSG(wxT("Invalid Add form called."));
 744     return (wxSizerItem*)NULL;
 745 }
 746
 747 wxSizerItem* wxGridBagSizer::Prepend( wxWindow *, int, int, int, wxObject*  )
 748 {
 749     wxFAIL_MSG(wxT("Prepend should not be used with wxGridBagSizer."));
 750     return (wxSizerItem*)NULL;
 751 }
 752
 753 wxSizerItem* wxGridBagSizer::Prepend( wxSizer *, int, int, int, wxObject*  )
 754 {
 755     wxFAIL_MSG(wxT("Prepend should not be used with wxGridBagSizer."));
 756     return (wxSizerItem*)NULL;
 757 }
 758
 759 wxSizerItem* wxGridBagSizer::Prepend( int, int, int, int, int, wxObject*  )
 760 {
 761     wxFAIL_MSG(wxT("Prepend should not be used with wxGridBagSizer."));
 762     return (wxSizerItem*)NULL;
 763 }
 764
 765 wxSizerItem* wxGridBagSizer::Prepend( wxSizerItem * )
 766 {
 767     wxFAIL_MSG(wxT("Prepend should not be used with wxGridBagSizer."));
 768     return (wxSizerItem*)NULL;
 769 }
 770
 771
 772 wxSizerItem* wxGridBagSizer::Insert( size_t, wxWindow *, int, int, int, wxObject*  )
 773 {
 774     wxFAIL_MSG(wxT("Insert should not be used with wxGridBagSizer."));
 775     return (wxSizerItem*)NULL;
 776 }
 777
 778 wxSizerItem* wxGridBagSizer::Insert( size_t, wxSizer *, int, int, int, wxObject*  )
 779 {
 780     wxFAIL_MSG(wxT("Insert should not be used with wxGridBagSizer."));
 781     return (wxSizerItem*)NULL;
 782 }
 783
 784 wxSizerItem* wxGridBagSizer::Insert( size_t, int, int, int, int, int, wxObject*  )
 785 {
 786     wxFAIL_MSG(wxT("Insert should not be used with wxGridBagSizer."));
 787     return (wxSizerItem*)NULL;
 788 }
 789
 790 wxSizerItem* wxGridBagSizer::Insert( size_t, wxSizerItem * )
 791 {
 792     wxFAIL_MSG(wxT("Insert should not be used with wxGridBagSizer."));
 793     return (wxSizerItem*)NULL;
 794 }
 795
 796
 797 //---------------------------------------------------------------------------
 798 //---------------------------------------------------------------------------