src/generic/treectrl.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        treectrl.cpp
   3 // Purpose:     generic tree control implementation
   4 // Author:      Robert Roebling
   5 // Created:     01/02/97
   6 // Modified:    22/10/98 - almost total rewrite, simpler interface (VZ)
   7 // Id:          $Id$
   8 // Copyright:   (c) 1998 Robert Roebling, Julian Smart and Markus Holzem
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // =============================================================================
  13 // declarations
  14 // =============================================================================
  15
  16 // -----------------------------------------------------------------------------
  17 // headers
  18 // -----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21   #pragma implementation "treectrl.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 #include "wx/generic/treectrl.h"
  32 #include "wx/generic/imaglist.h"
  33 #include "wx/settings.h"
  34 #include "wx/log.h"
  35 #include "wx/intl.h"
  36 #include "wx/dynarray.h"
  37 #include "wx/dcclient.h"
  38 #include "wx/msgdlg.h"
  39
  40 // -----------------------------------------------------------------------------
  41 // array types
  42 // -----------------------------------------------------------------------------
  43
  44 class WXDLLEXPORT wxGenericTreeItem;
  45
  46 WX_DEFINE_ARRAY(wxGenericTreeItem *, wxArrayTreeItems);
  47
  48 // -----------------------------------------------------------------------------
  49 // private classes
  50 // -----------------------------------------------------------------------------
  51
  52 // a tree item
  53 class WXDLLEXPORT wxGenericTreeItem
  54 {
  55 public:
  56   // ctors & dtor
  57   wxGenericTreeItem() { m_data = NULL; }
  58   wxGenericTreeItem( wxGenericTreeItem *parent,
  59                      const wxString& text,
  60                      wxDC& dc,
  61                      int image, int selImage,
  62                      wxTreeItemData *data );
  63
  64   ~wxGenericTreeItem();
  65
  66   // trivial accessors
  67   wxArrayTreeItems& GetChildren() { return m_children; }
  68
  69   const wxString& GetText() const { return m_text; }
  70   int GetImage() const { return m_image; }
  71   int GetSelectedImage() const { return m_selImage; }
  72   wxTreeItemData *GetData() const { return m_data; }
  73
  74   void SetText( const wxString &text, wxDC& dc );
  75   void SetImage(int image) { m_image = image; }
  76   void SetSelectedImage(int image) { m_selImage = image; }
  77   void SetData(wxTreeItemData *data) { m_data = data; }
  78
  79   void SetHasPlus(bool has = TRUE) { m_hasPlus = has; }
  80
  81   void SetBold(bool bold) { m_isBold = bold; }
  82
  83   int GetX() const { return m_x; }
  84   int GetY() const { return m_y; }
  85
  86   void SetHeight(int h) { m_height = h; }
  87
  88   void SetX(int x) { m_x = x; }
  89   void SetY(int y) { m_y = y; }
  90
  91   wxGenericTreeItem *GetParent() const { return m_parent; }
  92
  93   // operations
  94     // deletes all children notifying the treectrl about it if !NULL pointer
  95     // given
  96   void DeleteChildren(wxTreeCtrl *tree = NULL);
  97     // FIXME don't know what is it for
  98   void Reset();
  99
 100   // get count of all children (and grand children if 'recursively')
 101   size_t GetChildrenCount(bool recursively = TRUE) const;
 102
 103   void Insert(wxGenericTreeItem *child, size_t index)
 104     { m_children.Insert(child, index); }
 105
 106   void SetCross( int x, int y );
 107   void GetSize( int &x, int &y );
 108
 109   // return the item at given position (or NULL if no item), onButton is TRUE
 110   // if the point belongs to the item's button, otherwise it lies on the
 111   // button's label
 112   wxGenericTreeItem *HitTest( const wxPoint& point, bool &onButton );
 113
 114   void Expand() { m_isCollapsed = FALSE; }
 115   void Collapse() { m_isCollapsed = TRUE; }
 116
 117   void SetHilight( bool set = TRUE ) { m_hasHilight = set; }
 118
 119   // status inquiries
 120   bool HasChildren() const { return !m_children.IsEmpty(); }
 121   bool HasHilight()  const { return m_hasHilight; }
 122   bool IsExpanded()  const { return !m_isCollapsed; }
 123   bool HasPlus()     const { return m_hasPlus || HasChildren(); }
 124   bool IsBold()      const { return m_isBold; }
 125
 126 private:
 127   wxString            m_text;
 128
 129   int                 m_image,
 130                       m_selImage;
 131
 132   wxTreeItemData     *m_data;
 133
 134   // use bitfields to save size
 135   int                 m_isCollapsed :1;
 136   int                 m_hasHilight  :1; // same as focused
 137   int                 m_hasPlus     :1; // used for item which doesn't have
 138                                         // children but still has a [+] button
 139   int                 m_isBold      :1; // render the label in bold font
 140
 141   int                 m_x, m_y;
 142   long                m_height, m_width;
 143   int                 m_xCross, m_yCross;
 144   int                 m_level;
 145   wxArrayTreeItems    m_children;
 146   wxGenericTreeItem  *m_parent;
 147 };
 148
 149 // =============================================================================
 150 // implementation
 151 // =============================================================================
 152
 153 // -----------------------------------------------------------------------------
 154 // wxTreeEvent
 155 // -----------------------------------------------------------------------------
 156
 157 IMPLEMENT_DYNAMIC_CLASS(wxTreeEvent, wxNotifyEvent)
 158
 159 wxTreeEvent::wxTreeEvent( wxEventType commandType, int id )
 160            : wxNotifyEvent( commandType, id )
 161 {
 162   m_code = 0;
 163   m_itemOld = (wxGenericTreeItem *)NULL;
 164 }
 165
 166 // -----------------------------------------------------------------------------
 167 // wxGenericTreeItem
 168 // -----------------------------------------------------------------------------
 169
 170 wxGenericTreeItem::wxGenericTreeItem(wxGenericTreeItem *parent,
 171                                      const wxString& text,
 172                                      wxDC& dc,
 173                                      int image, int selImage,
 174                                      wxTreeItemData *data)
 175                  : m_text(text)
 176 {
 177   m_image = image;
 178   m_selImage = selImage;
 179   m_data = data;
 180   m_x = m_y = 0;
 181   m_xCross = m_yCross = 0;
 182
 183   m_level = 0;
 184
 185   m_isCollapsed = TRUE;
 186   m_hasHilight = FALSE;
 187   m_hasPlus = FALSE;
 188   m_isBold = FALSE;
 189
 190   m_parent = parent;
 191
 192   dc.GetTextExtent( m_text, &m_width, &m_height );
 193 }
 194
 195 wxGenericTreeItem::~wxGenericTreeItem()
 196 {
 197   delete m_data;
 198
 199   wxASSERT_MSG( m_children.IsEmpty(),
 200                 "please call DeleteChildren() before deleting the item" );
 201 }
 202
 203 void wxGenericTreeItem::DeleteChildren(wxTreeCtrl *tree)
 204 {
 205   size_t count = m_children.Count();
 206   for ( size_t n = 0; n < count; n++ )
 207   {
 208     wxGenericTreeItem *child = m_children[n];
 209     if ( tree )
 210     {
 211       tree->SendDeleteEvent(child);
 212     }
 213
 214     child->DeleteChildren(tree);
 215     delete child;
 216   }
 217
 218   m_children.Empty();
 219 }
 220
 221 void wxGenericTreeItem::SetText( const wxString &text, wxDC& dc )
 222 {
 223   m_text = text;
 224
 225   dc.GetTextExtent( m_text, &m_width, &m_height );
 226 }
 227
 228 void wxGenericTreeItem::Reset()
 229 {
 230   m_text.Empty();
 231   m_image =
 232   m_selImage = -1;
 233   m_data = NULL;
 234   m_x = m_y =
 235   m_height = m_width = 0;
 236   m_xCross =
 237   m_yCross = 0;
 238
 239   m_level = 0;
 240
 241   DeleteChildren();
 242   m_isCollapsed = TRUE;
 243
 244   m_parent = (wxGenericTreeItem *)NULL;
 245 }
 246
 247 size_t wxGenericTreeItem::GetChildrenCount(bool recursively) const
 248 {
 249   size_t count = m_children.Count();
 250   if ( !recursively )
 251     return count;
 252
 253   size_t total = count;
 254   for ( size_t n = 0; n < count; n++ )
 255   {
 256     total += m_children[n]->GetChildrenCount();
 257   }
 258
 259   return total;
 260 }
 261
 262 void wxGenericTreeItem::SetCross( int x, int y )
 263 {
 264   m_xCross = x;
 265   m_yCross = y;
 266 }
 267
 268 void wxGenericTreeItem::GetSize( int &x, int &y )
 269 {
 270   if ( y < m_y ) y = m_y;
 271   int width = m_x +  m_width;
 272   if (width > x) x = width;
 273
 274   if (IsExpanded())
 275   {
 276     size_t count = m_children.Count();
 277     for ( size_t n = 0; n < count; n++ )
 278     {
 279       m_children[n]->GetSize( x, y );
 280     }
 281   }
 282 }
 283
 284 wxGenericTreeItem *wxGenericTreeItem::HitTest( const wxPoint& point,
 285                                                bool &onButton )
 286 {
 287   if ((point.y > m_y) && (point.y < m_y + m_height))
 288   {
 289     // FIXME why +5?
 290     if ((point.x > m_xCross-5) && (point.x < m_xCross+5) &&
 291         (point.y > m_yCross-5) && (point.y < m_yCross+5) &&
 292         (IsExpanded() || HasPlus()))
 293     {
 294       onButton = TRUE;
 295       return this;
 296     }
 297
 298     int w = m_width;
 299     if (m_image != -1) w += 20;
 300
 301     if ((point.x > m_x) && (point.x < m_x+w))
 302     {
 303       onButton = FALSE;
 304       return this;
 305     }
 306   }
 307   else
 308   {
 309     if (!m_isCollapsed)
 310     {
 311       size_t count = m_children.Count();
 312       for ( size_t n = 0; n < count; n++ )
 313       {
 314         wxGenericTreeItem *res = m_children[n]->HitTest( point, onButton );
 315         if ( res != NULL )
 316           return res;
 317       }
 318     }
 319   }
 320
 321   return NULL;
 322 }
 323
 324 // -----------------------------------------------------------------------------
 325 // wxTreeCtrl implementation
 326 // -----------------------------------------------------------------------------
 327
 328 IMPLEMENT_DYNAMIC_CLASS(wxTreeCtrl, wxScrolledWindow)
 329
 330 BEGIN_EVENT_TABLE(wxTreeCtrl,wxScrolledWindow)
 331   EVT_PAINT          (wxTreeCtrl::OnPaint)
 332   EVT_MOUSE_EVENTS   (wxTreeCtrl::OnMouse)
 333   EVT_CHAR           (wxTreeCtrl::OnChar)
 334   EVT_SET_FOCUS      (wxTreeCtrl::OnSetFocus)
 335   EVT_KILL_FOCUS     (wxTreeCtrl::OnKillFocus)
 336   EVT_IDLE           (wxTreeCtrl::OnIdle)
 337 END_EVENT_TABLE()
 338
 339 // -----------------------------------------------------------------------------
 340 // construction/destruction
 341 // -----------------------------------------------------------------------------
 342 void wxTreeCtrl::Init()
 343 {
 344   m_current =
 345   m_anchor = (wxGenericTreeItem *) NULL;
 346   m_hasFocus = FALSE;
 347   m_dirty = FALSE;
 348
 349   m_xScroll = 0;
 350   m_yScroll = 0;
 351   m_lineHeight = 10;
 352   m_indent = 15;
 353
 354   m_hilightBrush = new wxBrush
 355     (
 356       wxSystemSettings::GetSystemColour(wxSYS_COLOUR_HIGHLIGHT),
 357       wxSOLID
 358     );
 359
 360   m_imageListNormal =
 361   m_imageListState = (wxImageList *) NULL;
 362
 363   m_dragCount = 0;
 364 }
 365
 366 bool wxTreeCtrl::Create(wxWindow *parent, wxWindowID id,
 367                         const wxPoint& pos, const wxSize& size,
 368                         long style,
 369             const wxValidator &validator,
 370             const wxString& name )
 371 {
 372   Init();
 373
 374   wxScrolledWindow::Create( parent, id, pos, size, style|wxHSCROLL|wxVSCROLL, name );
 375
 376   SetValidator( validator );
 377
 378   SetBackgroundColour( *wxWHITE );
 379   m_dottedPen = wxPen( *wxBLACK, 0, 0 );
 380
 381   return TRUE;
 382 }
 383
 384 wxTreeCtrl::~wxTreeCtrl()
 385 {
 386   wxDELETE( m_hilightBrush );
 387
 388   DeleteAllItems();
 389 }
 390
 391 // -----------------------------------------------------------------------------
 392 // accessors
 393 // -----------------------------------------------------------------------------
 394
 395 size_t wxTreeCtrl::GetCount() const
 396 {
 397   return m_anchor == NULL ? 0u : m_anchor->GetChildrenCount();
 398 }
 399
 400 void wxTreeCtrl::SetIndent(unsigned int indent)
 401 {
 402   m_indent = indent;
 403   Refresh();
 404 }
 405
 406 size_t wxTreeCtrl::GetChildrenCount(const wxTreeItemId& item, bool recursively)
 407 {
 408   wxCHECK_MSG( item.IsOk(), 0u, "invalid tree item" );
 409
 410   return item.m_pItem->GetChildrenCount(recursively);
 411 }
 412
 413 // -----------------------------------------------------------------------------
 414 // functions to work with tree items
 415 // -----------------------------------------------------------------------------
 416
 417 wxString wxTreeCtrl::GetItemText(const wxTreeItemId& item) const
 418 {
 419   wxCHECK_MSG( item.IsOk(), "", "invalid tree item" );
 420
 421   return item.m_pItem->GetText();
 422 }
 423
 424 int wxTreeCtrl::GetItemImage(const wxTreeItemId& item) const
 425 {
 426   wxCHECK_MSG( item.IsOk(), -1, "invalid tree item" );
 427
 428   return item.m_pItem->GetImage();
 429 }
 430
 431 int wxTreeCtrl::GetItemSelectedImage(const wxTreeItemId& item) const
 432 {
 433   wxCHECK_MSG( item.IsOk(), -1, "invalid tree item" );
 434
 435   return item.m_pItem->GetSelectedImage();
 436 }
 437
 438 wxTreeItemData *wxTreeCtrl::GetItemData(const wxTreeItemId& item) const
 439 {
 440   wxCHECK_MSG( item.IsOk(), NULL, "invalid tree item" );
 441
 442   return item.m_pItem->GetData();
 443 }
 444
 445 void wxTreeCtrl::SetItemText(const wxTreeItemId& item, const wxString& text)
 446 {
 447   wxCHECK_RET( item.IsOk(), "invalid tree item" );
 448
 449   wxClientDC dc(this);
 450   wxGenericTreeItem *pItem = item.m_pItem;
 451   pItem->SetText(text, dc);
 452   RefreshLine(pItem);
 453 }
 454
 455 void wxTreeCtrl::SetItemImage(const wxTreeItemId& item, int image)
 456 {
 457   wxCHECK_RET( item.IsOk(), "invalid tree item" );
 458
 459   wxGenericTreeItem *pItem = item.m_pItem;
 460   pItem->SetImage(image);
 461   RefreshLine(pItem);
 462 }
 463
 464 void wxTreeCtrl::SetItemSelectedImage(const wxTreeItemId& item, int image)
 465 {
 466   wxCHECK_RET( item.IsOk(), "invalid tree item" );
 467
 468   wxGenericTreeItem *pItem = item.m_pItem;
 469   pItem->SetSelectedImage(image);
 470   RefreshLine(pItem);
 471 }
 472
 473 void wxTreeCtrl::SetItemData(const wxTreeItemId& item, wxTreeItemData *data)
 474 {
 475   wxCHECK_RET( item.IsOk(), "invalid tree item" );
 476
 477   item.m_pItem->SetData(data);
 478 }
 479
 480 void wxTreeCtrl::SetItemHasChildren(const wxTreeItemId& item, bool has)
 481 {
 482   wxCHECK_RET( item.IsOk(), "invalid tree item" );
 483
 484   wxGenericTreeItem *pItem = item.m_pItem;
 485   pItem->SetHasPlus(has);
 486   RefreshLine(pItem);
 487 }
 488
 489 void wxTreeCtrl::SetItemBold(const wxTreeItemId& item, bool bold)
 490 {
 491   wxCHECK_RET( item.IsOk(), "invalid tree item" );
 492
 493   // avoid redrawing the tree if no real change
 494   wxGenericTreeItem *pItem = item.m_pItem;
 495   if ( pItem->IsBold() != bold )
 496   {
 497     pItem->SetBold(bold);
 498     RefreshLine(pItem);
 499   }
 500 }
 501
 502 // -----------------------------------------------------------------------------
 503 // item status inquiries
 504 // -----------------------------------------------------------------------------
 505
 506 bool wxTreeCtrl::IsVisible(const wxTreeItemId& WXUNUSED(item)) const
 507 {
 508   wxFAIL_MSG("not implemented");
 509
 510   return TRUE;
 511 }
 512
 513 bool wxTreeCtrl::ItemHasChildren(const wxTreeItemId& item) const
 514 {
 515   wxCHECK_MSG( item.IsOk(), FALSE, "invalid tree item" );
 516
 517   return !item.m_pItem->GetChildren().IsEmpty();
 518 }
 519
 520 bool wxTreeCtrl::IsExpanded(const wxTreeItemId& item) const
 521 {
 522   wxCHECK_MSG( item.IsOk(), FALSE, "invalid tree item" );
 523
 524   return item.m_pItem->IsExpanded();
 525 }
 526
 527 bool wxTreeCtrl::IsSelected(const wxTreeItemId& item) const
 528 {
 529   wxCHECK_MSG( item.IsOk(), FALSE, "invalid tree item" );
 530
 531   return item.m_pItem->HasHilight();
 532 }
 533
 534 bool wxTreeCtrl::IsBold(const wxTreeItemId& item) const
 535 {
 536   wxCHECK_MSG( item.IsOk(), FALSE, "invalid tree item" );
 537
 538   return item.m_pItem->IsBold();
 539 }
 540
 541 // -----------------------------------------------------------------------------
 542 // navigation
 543 // -----------------------------------------------------------------------------
 544
 545 wxTreeItemId wxTreeCtrl::GetParent(const wxTreeItemId& item) const
 546 {
 547   wxCHECK_MSG( item.IsOk(), wxTreeItemId(), "invalid tree item" );
 548
 549   return item.m_pItem->GetParent();
 550 }
 551
 552 wxTreeItemId wxTreeCtrl::GetFirstChild(const wxTreeItemId& item, long& cookie) const
 553 {
 554   wxCHECK_MSG( item.IsOk(), wxTreeItemId(), "invalid tree item" );
 555
 556   cookie = 0;
 557   return GetNextChild(item, cookie);
 558 }
 559
 560 wxTreeItemId wxTreeCtrl::GetNextChild(const wxTreeItemId& item, long& cookie) const
 561 {
 562   wxCHECK_MSG( item.IsOk(), wxTreeItemId(), "invalid tree item" );
 563
 564   wxArrayTreeItems& children = item.m_pItem->GetChildren();
 565   if ( (size_t)cookie < children.Count() )
 566   {
 567     return children.Item(cookie++);
 568   }
 569   else
 570   {
 571     // there are no more of them
 572     return wxTreeItemId();
 573   }
 574 }
 575
 576 wxTreeItemId wxTreeCtrl::GetLastChild(const wxTreeItemId& item) const
 577 {
 578   wxCHECK_MSG( item.IsOk(), wxTreeItemId(), "invalid tree item" );
 579
 580   wxArrayTreeItems& children = item.m_pItem->GetChildren();
 581   return (children.IsEmpty() ? wxTreeItemId() : wxTreeItemId(children.Last()));
 582 }
 583
 584 wxTreeItemId wxTreeCtrl::GetNextSibling(const wxTreeItemId& item) const
 585 {
 586   wxCHECK_MSG( item.IsOk(), wxTreeItemId(), "invalid tree item" );
 587
 588   wxGenericTreeItem *i = item.m_pItem;
 589   wxGenericTreeItem *parent = i->GetParent();
 590   if ( parent == NULL )
 591   {
 592     // root item doesn't have any siblings
 593     return wxTreeItemId();
 594   }
 595
 596   wxArrayTreeItems& siblings = parent->GetChildren();
 597   int index = siblings.Index(i);
 598   wxASSERT( index != wxNOT_FOUND ); // I'm not a child of my parent?
 599
 600   size_t n = (size_t)(index + 1);
 601   return n == siblings.Count() ? wxTreeItemId() : wxTreeItemId(siblings[n]);
 602 }
 603
 604 wxTreeItemId wxTreeCtrl::GetPrevSibling(const wxTreeItemId& item) const
 605 {
 606   wxCHECK_MSG( item.IsOk(), wxTreeItemId(), "invalid tree item" );
 607
 608   wxGenericTreeItem *i = item.m_pItem;
 609   wxGenericTreeItem *parent = i->GetParent();
 610   if ( parent == NULL )
 611   {
 612     // root item doesn't have any siblings
 613     return wxTreeItemId();
 614   }
 615
 616   wxArrayTreeItems& siblings = parent->GetChildren();
 617   int index = siblings.Index(i);
 618   wxASSERT( index != wxNOT_FOUND ); // I'm not a child of my parent?
 619
 620   return index == 0 ? wxTreeItemId()
 621                     : wxTreeItemId(siblings[(size_t)(index - 1)]);
 622 }
 623
 624 wxTreeItemId wxTreeCtrl::GetFirstVisibleItem() const
 625 {
 626   wxFAIL_MSG("not implemented");
 627
 628   return wxTreeItemId();
 629 }
 630
 631 wxTreeItemId wxTreeCtrl::GetNextVisible(const wxTreeItemId& item) const
 632 {
 633   wxCHECK_MSG( item.IsOk(), wxTreeItemId(), "invalid tree item" );
 634
 635   wxFAIL_MSG("not implemented");
 636
 637   return wxTreeItemId();
 638 }
 639
 640 wxTreeItemId wxTreeCtrl::GetPrevVisible(const wxTreeItemId& item) const
 641 {
 642   wxCHECK_MSG( item.IsOk(), wxTreeItemId(), "invalid tree item" );
 643
 644   wxFAIL_MSG("not implemented");
 645
 646   return wxTreeItemId();
 647 }
 648
 649 // -----------------------------------------------------------------------------
 650 // operations
 651 // -----------------------------------------------------------------------------
 652
 653 wxTreeItemId wxTreeCtrl::DoInsertItem(const wxTreeItemId& parentId,
 654                                       size_t previous,
 655                                       const wxString& text,
 656                                       int image, int selImage,
 657                                       wxTreeItemData *data)
 658 {
 659   wxGenericTreeItem *parent = parentId.m_pItem;
 660   if ( !parent )
 661   {
 662     // should we give a warning here?
 663     return AddRoot(text, image, selImage, data);
 664   }
 665
 666   wxClientDC dc(this);
 667   wxGenericTreeItem *item = new wxGenericTreeItem(parent,
 668                                                   text, dc,
 669                                                   image, selImage,
 670                                                   data);
 671
 672   if ( data != NULL )
 673   {
 674     data->m_pItem = item;
 675   }
 676
 677   parent->Insert( item, previous );
 678
 679   m_dirty = TRUE;
 680
 681   return item;
 682 }
 683
 684 wxTreeItemId wxTreeCtrl::AddRoot(const wxString& text,
 685                                  int image, int selImage,
 686                                  wxTreeItemData *data)
 687 {
 688   wxCHECK_MSG( !m_anchor, wxTreeItemId(), "tree can have only one root" );
 689
 690   wxClientDC dc(this);
 691   m_anchor = new wxGenericTreeItem((wxGenericTreeItem *)NULL, text, dc,
 692                                    image, selImage, data);
 693   if ( data != NULL )
 694   {
 695     data->m_pItem = m_anchor;
 696   }
 697
 698   AdjustMyScrollbars();
 699   Refresh();
 700
 701   return m_anchor;
 702 }
 703
 704 wxTreeItemId wxTreeCtrl::PrependItem(const wxTreeItemId& parent,
 705                                      const wxString& text,
 706                                      int image, int selImage,
 707                                      wxTreeItemData *data)
 708 {
 709   return DoInsertItem(parent, 0u, text, image, selImage, data);
 710 }
 711
 712 wxTreeItemId wxTreeCtrl::InsertItem(const wxTreeItemId& parentId,
 713                                     const wxTreeItemId& idPrevious,
 714                                     const wxString& text,
 715                                     int image, int selImage,
 716                                     wxTreeItemData *data)
 717 {
 718   wxGenericTreeItem *parent = parentId.m_pItem;
 719   if ( !parent )
 720   {
 721     // should we give a warning here?
 722     return AddRoot(text, image, selImage, data);
 723   }
 724
 725   int index = parent->GetChildren().Index(idPrevious.m_pItem);
 726   wxASSERT_MSG( index != wxNOT_FOUND,
 727                 "previous item in wxTreeCtrl::InsertItem() is not a sibling" );
 728   return DoInsertItem(parentId, (size_t)index, text, image, selImage, data);
 729 }
 730
 731 wxTreeItemId wxTreeCtrl::AppendItem(const wxTreeItemId& parentId,
 732                                     const wxString& text,
 733                                     int image, int selImage,
 734                                     wxTreeItemData *data)
 735 {
 736   wxGenericTreeItem *parent = parentId.m_pItem;
 737   if ( !parent )
 738   {
 739     // should we give a warning here?
 740     return AddRoot(text, image, selImage, data);
 741   }
 742
 743   return DoInsertItem(parent, parent->GetChildren().Count(), text,
 744                       image, selImage, data);
 745 }
 746
 747 void wxTreeCtrl::SendDeleteEvent(wxGenericTreeItem *item)
 748 {
 749   wxTreeEvent event( wxEVT_COMMAND_TREE_DELETE_ITEM, GetId() );
 750   event.m_item = item;
 751   event.SetEventObject( this );
 752   ProcessEvent( event );
 753 }
 754
 755 void wxTreeCtrl::DeleteChildren(const wxTreeItemId& itemId)
 756 {
 757     wxGenericTreeItem *item = itemId.m_pItem;
 758     item->DeleteChildren(this);
 759
 760     m_dirty = TRUE;
 761 }
 762
 763 void wxTreeCtrl::Delete(const wxTreeItemId& itemId)
 764 {
 765   wxGenericTreeItem *item = itemId.m_pItem;
 766   wxGenericTreeItem *parent = item->GetParent();
 767
 768   if ( parent )
 769   {
 770     parent->GetChildren().Remove(item);
 771   }
 772
 773   item->DeleteChildren(this);
 774   SendDeleteEvent(item);
 775   delete item;
 776
 777   m_dirty = TRUE;
 778 }
 779
 780 void wxTreeCtrl::DeleteAllItems()
 781 {
 782   if ( m_anchor )
 783   {
 784     m_anchor->DeleteChildren(this);
 785     delete m_anchor;
 786
 787     m_anchor = NULL;
 788
 789     m_dirty = TRUE;
 790   }
 791 }
 792
 793 void wxTreeCtrl::Expand(const wxTreeItemId& itemId)
 794 {
 795   wxGenericTreeItem *item = itemId.m_pItem;
 796
 797   if ( !item->HasPlus() )
 798     return;
 799
 800   if ( item->IsExpanded() )
 801     return;
 802
 803   wxTreeEvent event( wxEVT_COMMAND_TREE_ITEM_EXPANDING, GetId() );
 804   event.m_item = item;
 805   event.SetEventObject( this );
 806   if ( ProcessEvent( event ) && event.m_code )
 807   {
 808     // cancelled by program
 809     return;
 810   }
 811
 812   item->Expand();
 813   CalculatePositions();
 814
 815   RefreshSubtree(item);
 816
 817   event.SetEventType(wxEVT_COMMAND_TREE_ITEM_EXPANDED);
 818   ProcessEvent( event );
 819 }
 820
 821 void wxTreeCtrl::Collapse(const wxTreeItemId& itemId)
 822 {
 823   wxGenericTreeItem *item = itemId.m_pItem;
 824
 825   if ( !item->IsExpanded() )
 826     return;
 827
 828   wxTreeEvent event( wxEVT_COMMAND_TREE_ITEM_COLLAPSING, GetId() );
 829   event.m_item = item;
 830   event.SetEventObject( this );
 831   if ( ProcessEvent( event ) && event.m_code )
 832   {
 833     // cancelled by program
 834     return;
 835   }
 836
 837   item->Collapse();
 838
 839   wxArrayTreeItems& children = item->GetChildren();
 840   size_t count = children.Count();
 841   for ( size_t n = 0; n < count; n++ )
 842   {
 843     Collapse(children[n]);
 844   }
 845
 846   CalculatePositions();
 847
 848   RefreshSubtree(item);
 849
 850   event.SetEventType(wxEVT_COMMAND_TREE_ITEM_COLLAPSED);
 851   ProcessEvent( event );
 852 }
 853
 854 void wxTreeCtrl::CollapseAndReset(const wxTreeItemId& item)
 855 {
 856   Collapse(item);
 857   DeleteChildren(item);
 858 }
 859
 860 void wxTreeCtrl::Toggle(const wxTreeItemId& itemId)
 861 {
 862   wxGenericTreeItem *item = itemId.m_pItem;
 863
 864   if ( item->IsExpanded() )
 865     Collapse(itemId);
 866   else
 867     Expand(itemId);
 868 }
 869
 870 void wxTreeCtrl::Unselect()
 871 {
 872   if ( m_current )
 873   {
 874     m_current->SetHilight( FALSE );
 875     RefreshLine( m_current );
 876   }
 877 }
 878
 879 void wxTreeCtrl::SelectItem(const wxTreeItemId& itemId)
 880 {
 881   wxGenericTreeItem *item = itemId.m_pItem;
 882
 883   if ( m_current != item )
 884   {
 885     wxTreeEvent event( wxEVT_COMMAND_TREE_SEL_CHANGING, GetId() );
 886     event.m_item = item;
 887     event.m_itemOld = m_current;
 888     event.SetEventObject( this );
 889     if ( GetEventHandler()->ProcessEvent( event ) && event.WasVetoed() )
 890       return;
 891
 892     if ( m_current )
 893     {
 894       m_current->SetHilight( FALSE );
 895       RefreshLine( m_current );
 896     }
 897
 898     m_current = item;
 899     m_current->SetHilight( TRUE );
 900     RefreshLine( m_current );
 901
 902     event.SetEventType(wxEVT_COMMAND_TREE_SEL_CHANGED);
 903     GetEventHandler()->ProcessEvent( event );
 904   }
 905 }
 906
 907 void wxTreeCtrl::EnsureVisible(const wxTreeItemId& item)
 908 {
 909     wxGenericTreeItem *gitem = item.m_pItem;
 910
 911     // first expand all parent branches
 912     wxGenericTreeItem *parent = gitem->GetParent();
 913     while ( parent && !parent->IsExpanded() )
 914     {
 915         Expand(parent);
 916
 917         parent = parent->GetParent();
 918     }
 919
 920     // now scroll to the item
 921     int item_y = gitem->GetY();
 922
 923     int start_x = 0;
 924     int start_y = 0;
 925     ViewStart( &start_x, &start_y );
 926     start_y *= 10;
 927
 928     int client_h = 0;
 929     int client_w = 0;
 930     GetClientSize( &client_w, &client_h );
 931
 932     if (item_y < start_y+3)
 933     {
 934         int x = 0;
 935         int y = 0;
 936         m_anchor->GetSize( x, y );
 937         y += 2*m_lineHeight;
 938         int x_pos = GetScrollPos( wxHORIZONTAL );
 939         SetScrollbars( 10, 10, x/10, y/10, x_pos, (item_y-client_h/2)/10 );
 940     }
 941     else if (item_y > start_y+client_h-16)
 942     {
 943        int x = 0;
 944        int y = 0;
 945        m_anchor->GetSize( x, y );
 946        y += 2*m_lineHeight;
 947        int x_pos = GetScrollPos( wxHORIZONTAL );
 948        SetScrollbars( 10, 10, x/10, y/10, x_pos, (item_y-client_h/2)/10 );
 949     }
 950 }
 951
 952 void wxTreeCtrl::ScrollTo(const wxTreeItemId& WXUNUSED(item))
 953 {
 954     wxFAIL_MSG("not implemented");
 955 }
 956
 957 wxTextCtrl *wxTreeCtrl::EditLabel( const wxTreeItemId& WXUNUSED(item),
 958                                    wxClassInfo* WXUNUSED(textCtrlClass) )
 959 {
 960     wxFAIL_MSG("not implemented");
 961
 962     return (wxTextCtrl*)NULL;
 963 }
 964
 965 wxTextCtrl *wxTreeCtrl::GetEditControl() const
 966 {
 967     wxFAIL_MSG("not implemented");
 968
 969     return (wxTextCtrl*)NULL;
 970 }
 971
 972 void wxTreeCtrl::EndEditLabel(const wxTreeItemId& WXUNUSED(item), bool WXUNUSED(discardChanges))
 973 {
 974     wxFAIL_MSG("not implemented");
 975 }
 976
 977 // FIXME: tree sorting functions are not reentrant and not MT-safe!
 978 static wxTreeCtrl *s_treeBeingSorted = NULL;
 979
 980 static int tree_ctrl_compare_func(wxGenericTreeItem **item1,
 981                                   wxGenericTreeItem **item2)
 982 {
 983     wxCHECK_MSG( s_treeBeingSorted, 0, "bug in wxTreeCtrl::SortChildren()" );
 984
 985     return s_treeBeingSorted->OnCompareItems(*item1, *item2);
 986 }
 987
 988 int wxTreeCtrl::OnCompareItems(const wxTreeItemId& item1,
 989                                const wxTreeItemId& item2)
 990 {
 991     return strcmp(GetItemText(item1), GetItemText(item2));
 992 }
 993
 994 void wxTreeCtrl::SortChildren(const wxTreeItemId& itemId)
 995 {
 996     wxCHECK_RET( itemId.IsOk(), "invalid tree item" );
 997
 998     wxGenericTreeItem *item = itemId.m_pItem;
 999
1000     wxCHECK_RET( !s_treeBeingSorted,
1001                  "wxTreeCtrl::SortChildren is not reentrant" );
1002
1003     wxArrayTreeItems& children = item->GetChildren();
1004     if ( children.Count() > 1 )
1005     {
1006         s_treeBeingSorted = this;
1007         children.Sort(tree_ctrl_compare_func);
1008         s_treeBeingSorted = NULL;
1009
1010         m_dirty = TRUE;
1011     }
1012     //else: don't make the tree dirty as nothing changed
1013 }
1014
1015 wxImageList *wxTreeCtrl::GetImageList() const
1016 {
1017     return m_imageListNormal;
1018 }
1019
1020 wxImageList *wxTreeCtrl::GetStateImageList() const
1021 {
1022     return m_imageListState;
1023 }
1024
1025 void wxTreeCtrl::SetImageList(wxImageList *imageList)
1026 {
1027     m_imageListNormal = imageList;
1028 }
1029
1030 void wxTreeCtrl::SetStateImageList(wxImageList *imageList)
1031 {
1032     m_imageListState = imageList;
1033 }
1034
1035 // -----------------------------------------------------------------------------
1036 // helpers
1037 // -----------------------------------------------------------------------------
1038
1039 void wxTreeCtrl::AdjustMyScrollbars()
1040 {
1041     if (m_anchor)
1042     {
1043         int x = 0;
1044         int y = 0;
1045         m_anchor->GetSize( x, y );
1046         y += 2*m_lineHeight;
1047         int x_pos = GetScrollPos( wxHORIZONTAL );
1048         int y_pos = GetScrollPos( wxVERTICAL );
1049         SetScrollbars( 10, 10, x/10, y/10, x_pos, y_pos );
1050     }
1051     else
1052     {
1053         SetScrollbars( 0, 0, 0, 0 );
1054     }
1055 }
1056
1057 void wxTreeCtrl::PaintItem(wxGenericTreeItem *item, wxDC& dc)
1058 {
1059     // render bold items in bold
1060     wxFont fontOld;
1061     wxFont fontNew;
1062
1063     if (item->IsBold())
1064     {
1065         fontOld = dc.GetFont();
1066         if (fontOld.Ok())
1067         {
1068           // VZ: is there any better way to make a bold variant of old font?
1069           fontNew = wxFont( fontOld.GetPointSize(),
1070                             fontOld.GetFamily(),
1071                             fontOld.GetStyle(),
1072                             wxBOLD,
1073                             fontOld.GetUnderlined());
1074           dc.SetFont(fontNew);
1075         }
1076         else
1077         {
1078             wxFAIL_MSG("wxDC::GetFont() failed!");
1079         }
1080     }
1081
1082     long text_w = 0;
1083     long text_h = 0;
1084     dc.GetTextExtent( item->GetText(), &text_w, &text_h );
1085
1086     int image_h = 0;
1087     int image_w = 0;
1088     if ((item->IsExpanded()) && (item->GetSelectedImage() != -1))
1089     {
1090         m_imageListNormal->GetSize( item->GetSelectedImage(), image_w, image_h );
1091         image_w += 4;
1092     }
1093     else if (item->GetImage() != -1)
1094     {
1095         m_imageListNormal->GetSize( item->GetImage(), image_w, image_h );
1096         image_w += 4;
1097     }
1098
1099     dc.DrawRectangle( item->GetX()-2, item->GetY()-2, image_w+text_w+4, text_h+4 );
1100
1101     if ((item->IsExpanded()) && (item->GetSelectedImage() != -1))
1102     {
1103         dc.SetClippingRegion( item->GetX(), item->GetY(), image_w-2, text_h );
1104         m_imageListNormal->Draw( item->GetSelectedImage(), dc,
1105                                  item->GetX(), item->GetY()-1,
1106                                  wxIMAGELIST_DRAW_TRANSPARENT );
1107         dc.DestroyClippingRegion();
1108     }
1109     else if (item->GetImage() != -1)
1110     {
1111         dc.SetClippingRegion( item->GetX(), item->GetY(), image_w-2, text_h );
1112         m_imageListNormal->Draw( item->GetImage(), dc,
1113                                  item->GetX(), item->GetY()-1,
1114                                  wxIMAGELIST_DRAW_TRANSPARENT );
1115         dc.DestroyClippingRegion();
1116     }
1117
1118     dc.SetBackgroundMode(wxTRANSPARENT);
1119     dc.DrawText( item->GetText(), image_w + item->GetX(), item->GetY() );
1120
1121     // restore normal font for bold items
1122     if (fontOld.Ok())
1123     {
1124         dc.SetFont( fontOld);
1125     }
1126 }
1127
1128 void wxTreeCtrl::PaintLevel( wxGenericTreeItem *item, wxDC &dc, int level, int &y )
1129 {
1130     int horizX = level*m_indent;
1131
1132     item->SetX( horizX+33 );
1133     item->SetY( y-m_lineHeight/3 );
1134     item->SetHeight( m_lineHeight );
1135
1136     item->SetCross( horizX+15, y );
1137
1138     int oldY = y;
1139
1140     int exposed_x = dc.LogicalToDeviceX( 0 );
1141     int exposed_y = dc.LogicalToDeviceY( item->GetY()-2 );
1142
1143     if (IsExposed( exposed_x, exposed_y, 10000, m_lineHeight+4 ))  // 10000 = very much
1144     {
1145         int startX = horizX;
1146         int endX = horizX + 10;
1147
1148         if (!item->HasChildren()) endX += 20;
1149
1150         dc.DrawLine( startX, y, endX, y );
1151
1152         if (item->HasPlus())
1153         {
1154             dc.DrawLine( horizX+20, y, horizX+30, y );
1155             dc.SetPen( *wxGREY_PEN );
1156             dc.SetBrush( *wxWHITE_BRUSH );
1157             dc.DrawRectangle( horizX+10, y-4, 11, 9 );
1158             dc.SetPen( *wxBLACK_PEN );
1159             dc.DrawLine( horizX+13, y, horizX+18, y );
1160
1161             if (!item->IsExpanded())
1162         {
1163                 dc.DrawLine( horizX+15, y-2, horizX+15, y+3 );
1164         }
1165         }
1166
1167         if (item->HasHilight())
1168         {
1169             dc.SetTextForeground( wxSystemSettings::GetSystemColour( wxSYS_COLOUR_HIGHLIGHTTEXT ) );
1170
1171             dc.SetBrush( *m_hilightBrush );
1172
1173             if (m_hasFocus)
1174                 dc.SetPen( *wxBLACK_PEN );
1175             else
1176                 dc.SetPen( *wxTRANSPARENT_PEN );
1177
1178             PaintItem(item, dc);
1179
1180             dc.SetPen( *wxBLACK_PEN );
1181             dc.SetTextForeground( *wxBLACK );
1182             dc.SetBrush( *wxWHITE_BRUSH );
1183         }
1184         else
1185         {
1186             dc.SetBrush( *wxWHITE_BRUSH );
1187             dc.SetPen( *wxTRANSPARENT_PEN );
1188
1189             PaintItem(item, dc);
1190
1191             dc.SetPen( *wxBLACK_PEN );
1192         }
1193     }
1194
1195     if (item->IsExpanded())
1196     {
1197         int semiOldY = y;
1198
1199         wxArrayTreeItems& children = item->GetChildren();
1200         size_t count = children.Count();
1201         for ( size_t n = 0; n < count; n++ )
1202         {
1203             y += m_lineHeight;
1204             semiOldY = y;
1205             PaintLevel( children[n], dc, level+1, y );
1206         }
1207
1208         // it may happen that the item is expanded but has no items (when you
1209         // delete all its children for example) - don't draw the vertical line
1210         // in this case
1211         if (count > 0)
1212             dc.DrawLine( horizX+15, oldY+5, horizX+15, semiOldY );
1213     }
1214 }
1215
1216 // -----------------------------------------------------------------------------
1217 // wxWindows callbacks
1218 // -----------------------------------------------------------------------------
1219
1220 void wxTreeCtrl::OnPaint( wxPaintEvent &WXUNUSED(event) )
1221 {
1222     if ( !m_anchor )
1223         return;
1224
1225     wxPaintDC dc(this);
1226     PrepareDC( dc );
1227
1228     dc.SetFont( wxSystemSettings::GetSystemFont( wxSYS_DEFAULT_GUI_FONT ) );
1229
1230     dc.SetPen( m_dottedPen );
1231     m_lineHeight = (int)(dc.GetCharHeight() + 4);
1232
1233     int y = m_lineHeight / 2 + 2;
1234     PaintLevel( m_anchor, dc, 0, y );
1235 }
1236
1237 void wxTreeCtrl::OnSetFocus( wxFocusEvent &WXUNUSED(event) )
1238 {
1239     m_hasFocus = TRUE;
1240
1241     if (m_current) RefreshLine( m_current );
1242 }
1243
1244 void wxTreeCtrl::OnKillFocus( wxFocusEvent &WXUNUSED(event) )
1245 {
1246     m_hasFocus = FALSE;
1247
1248     if (m_current) RefreshLine( m_current );
1249 }
1250
1251 void wxTreeCtrl::OnChar( wxKeyEvent &event )
1252 {
1253     wxTreeEvent te( wxEVT_COMMAND_TREE_KEY_DOWN, GetId() );
1254     te.m_code = event.KeyCode();
1255     te.SetEventObject( this );
1256     GetEventHandler()->ProcessEvent( te );
1257
1258     if (m_current == 0)
1259     {
1260         event.Skip();
1261         return;
1262     }
1263
1264     switch (event.KeyCode())
1265     {
1266         case '+':
1267         case WXK_ADD:
1268             if (m_current->HasPlus() && !IsExpanded(m_current))
1269             {
1270                 Expand(m_current);
1271             }
1272             break;
1273
1274         case '-':
1275         case WXK_SUBTRACT:
1276             if (IsExpanded(m_current))
1277             {
1278                 Collapse(m_current);
1279             }
1280             break;
1281
1282         case '*':
1283         case WXK_MULTIPLY:
1284             Toggle(m_current);
1285             break;
1286
1287         case ' ':
1288         case WXK_RETURN:
1289             {
1290                 wxTreeEvent event( wxEVT_COMMAND_TREE_ITEM_ACTIVATED, GetId() );
1291                 event.m_item = m_current;
1292                 event.m_code = 0;
1293                 event.SetEventObject( this );
1294                 GetEventHandler()->ProcessEvent( event );
1295             }
1296             break;
1297
1298             // up goes to the previous sibling or to the last of its children if
1299             // it's expanded
1300         case WXK_UP:
1301             {
1302                 wxTreeItemId prev = GetPrevSibling( m_current );
1303                 if (!prev)
1304                 {
1305                     prev = GetParent( m_current );
1306                     long cockie = 0;
1307                     wxTreeItemId current = m_current;
1308                     if (current == GetFirstChild( prev, cockie ))
1309                     {
1310                         // otherwise we return to where we came from
1311                         SelectItem( prev );
1312                         EnsureVisible( prev );
1313                         break;
1314                     }
1315                 }
1316                 if (prev)
1317                 {
1318                     while ( IsExpanded(prev) && HasChildren(prev) )
1319                     {
1320                         wxTreeItemId child = GetLastChild(prev);
1321                         if ( child )
1322                         {
1323                             prev = child;
1324                         }
1325                     }
1326
1327                     SelectItem( prev );
1328                     EnsureVisible( prev );
1329                 }
1330             }
1331             break;
1332
1333             // left arrow goes to the parent
1334         case WXK_LEFT:
1335             {
1336                 wxTreeItemId prev = GetParent( m_current );
1337                 if (prev)
1338                 {
1339                     EnsureVisible( prev );
1340                     SelectItem( prev );
1341                 }
1342             }
1343             break;
1344
1345         case WXK_RIGHT:
1346             // this works the same as the down arrow except that we also expand the
1347             // item if it wasn't expanded yet
1348             Expand(m_current);
1349             // fall through
1350
1351         case WXK_DOWN:
1352             {
1353                 if (IsExpanded(m_current) && HasChildren(m_current))
1354                 {
1355                     long cookie = 0;
1356                     wxTreeItemId child = GetFirstChild( m_current, cookie );
1357                     SelectItem( child );
1358                     EnsureVisible( child );
1359                 }
1360                 else
1361                 {
1362                     wxTreeItemId next = GetNextSibling( m_current );
1363                     if (next == 0)
1364                     {
1365                         wxTreeItemId current = m_current;
1366                         while (current && !next)
1367                         {
1368                             current = GetParent( current );
1369                             if (current) next = GetNextSibling( current );
1370                         }
1371                     }
1372                     if (next != 0)
1373                     {
1374                         SelectItem( next );
1375                         EnsureVisible( next );
1376                     }
1377                 }
1378             }
1379             break;
1380
1381             // <End> selects the last visible tree item
1382         case WXK_END:
1383             {
1384                 wxTreeItemId last = GetRootItem();
1385
1386                 while ( last.IsOk() && IsExpanded(last) )
1387                 {
1388                     wxTreeItemId lastChild = GetLastChild(last);
1389
1390                     // it may happen if the item was expanded but then all of
1391                     // its children have been deleted - so IsExpanded() returned
1392                     // TRUE, but GetLastChild() returned invalid item
1393                     if ( !lastChild )
1394                         break;
1395
1396                     last = lastChild;
1397                 }
1398
1399                 if ( last.IsOk() )
1400                 {
1401                     EnsureVisible( last );
1402                     SelectItem( last );
1403                 }
1404             }
1405             break;
1406
1407             // <Home> selects the root item
1408         case WXK_HOME:
1409             {
1410                 wxTreeItemId prev = GetRootItem();
1411                 if (prev)
1412                 {
1413                     EnsureVisible( prev );
1414                     SelectItem( prev );
1415                 }
1416             }
1417             break;
1418
1419         default:
1420             event.Skip();
1421     }
1422 }
1423
1424 wxTreeItemId wxTreeCtrl::HitTest(const wxPoint& point, int& WXUNUSED(flags))
1425 {
1426     bool onButton = FALSE;
1427     return m_anchor->HitTest( point, onButton );
1428 }
1429
1430 void wxTreeCtrl::OnMouse( wxMouseEvent &event )
1431 {
1432     if (!event.LeftIsDown()) m_dragCount = 0;
1433
1434     if ( !(event.LeftDown() || event.LeftDClick() || event.Dragging()) ) return;
1435
1436     if ( !m_anchor ) return;
1437
1438     wxClientDC dc(this);
1439     PrepareDC(dc);
1440     long x = dc.DeviceToLogicalX( (long)event.GetX() );
1441     long y = dc.DeviceToLogicalY( (long)event.GetY() );
1442
1443     bool onButton = FALSE;
1444     wxGenericTreeItem *item = m_anchor->HitTest( wxPoint(x,y), onButton );
1445
1446     if (item == NULL) return;  /* we hit the blank area */
1447
1448     if (event.Dragging())
1449     {
1450         if (m_dragCount == 2)  /* small drag latency (3?) */
1451         {
1452             m_dragCount = 0;
1453
1454             wxTreeEvent nevent(wxEVT_COMMAND_TREE_BEGIN_DRAG, GetId());
1455             nevent.m_item = m_current;
1456             nevent.SetEventObject(this);
1457             GetEventHandler()->ProcessEvent(nevent);
1458         }
1459         else
1460         {
1461             m_dragCount++;
1462         }
1463         return;
1464     }
1465
1466     if (!IsSelected(item))
1467         SelectItem(item);  /* we dont support multiple selections, BTW */
1468
1469     if (event.LeftDClick())
1470     {
1471         wxTreeEvent event( wxEVT_COMMAND_TREE_ITEM_ACTIVATED, GetId() );
1472         event.m_item = item;
1473         event.m_code = 0;
1474         event.SetEventObject( this );
1475         GetEventHandler()->ProcessEvent( event );
1476     }
1477
1478     if (onButton)
1479     {
1480         Toggle( item );
1481     }
1482 }
1483
1484 void wxTreeCtrl::OnIdle( wxIdleEvent &WXUNUSED(event) )
1485 {
1486     /* after all changes have been done to the tree control,
1487      * we actually redraw the tree when everything is over */
1488
1489     if (!m_dirty)
1490         return;
1491
1492     m_dirty = FALSE;
1493
1494     CalculatePositions();
1495
1496     AdjustMyScrollbars();
1497 }
1498
1499 // -----------------------------------------------------------------------------
1500
1501 void wxTreeCtrl::CalculateLevel( wxGenericTreeItem *item, wxDC &dc, int level, int &y )
1502 {
1503     int horizX = level*m_indent;
1504
1505     item->SetX( horizX+33 );
1506     item->SetY( y-m_lineHeight/3-2 );
1507     item->SetHeight( m_lineHeight );
1508
1509     if ( !item->IsExpanded() )
1510     {
1511         // we dont need to calculate collapsed branches
1512         return;
1513     }
1514
1515     wxArrayTreeItems& children = item->GetChildren();
1516     size_t count = children.Count();
1517     for ( size_t n = 0; n < count; n++ )
1518     {
1519         y += m_lineHeight;
1520         CalculateLevel( children[n], dc, level+1, y );  // recurse
1521     }
1522 }
1523
1524 void wxTreeCtrl::CalculatePositions()
1525 {
1526     if ( !m_anchor ) return;
1527
1528     wxClientDC dc(this);
1529     PrepareDC( dc );
1530
1531     dc.SetFont( wxSystemSettings::GetSystemFont( wxSYS_DEFAULT_GUI_FONT ) );
1532
1533     dc.SetPen( m_dottedPen );
1534     m_lineHeight = (int)(dc.GetCharHeight() + 4);
1535
1536     int y = m_lineHeight / 2 + 2;
1537     CalculateLevel( m_anchor, dc, 0, y ); // start recursion
1538 }
1539
1540 void wxTreeCtrl::RefreshSubtree(wxGenericTreeItem *item)
1541 {
1542     wxClientDC dc(this);
1543     PrepareDC(dc);
1544
1545     int cw = 0;
1546     int ch = 0;
1547     GetClientSize( &cw, &ch );
1548
1549     wxRect rect;
1550     rect.x = dc.LogicalToDeviceX( 0 );
1551     rect.width = cw;
1552     rect.y = dc.LogicalToDeviceY( item->GetY() );
1553     rect.height = ch;
1554
1555     Refresh( TRUE, &rect );
1556
1557     AdjustMyScrollbars();
1558 }
1559
1560 void wxTreeCtrl::RefreshLine( wxGenericTreeItem *item )
1561 {
1562     wxClientDC dc(this);
1563     PrepareDC( dc );
1564
1565     wxRect rect;
1566     rect.x = dc.LogicalToDeviceX( item->GetX() - 2 );
1567     rect.y = dc.LogicalToDeviceY( item->GetY() - 2 );
1568     rect.width = 1000;
1569     rect.height = dc.GetCharHeight() + 6;
1570
1571     Refresh( TRUE, &rect );
1572 }
1573