src/common/gbsizer.cpp

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