contrib/utils/wxrcedit/splittree.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        splittree.cpp
   3 // Purpose:     Classes to achieve a remotely-scrolled tree in a splitter
   4 //              window that can be scrolled by a scrolled window higher in the
   5 //              hierarchy
   6 // Author:      Julian Smart
   7 // Modified by:
   8 // Created:     8/7/2000
   9 // RCS-ID:      $Id$
  10 // Copyright:   (c) Julian Smart
  11 // Licence:     wxWindows licence
  12 /////////////////////////////////////////////////////////////////////////////
  13
  14 // ============================================================================
  15 // declarations
  16 // ============================================================================
  17
  18 // ----------------------------------------------------------------------------
  19 // headers
  20 // ----------------------------------------------------------------------------
  21 #if defined(__GNUG__) && !defined(__APPLE__)
  22     #pragma implementation "splittree.h"
  23 #endif
  24
  25 // For compilers that support precompilation, includes "wx/wx.h".
  26 #include "wx/wxprec.h"
  27
  28 #ifdef __BORLANDC__
  29     #pragma hdrstop
  30 #endif
  31
  32 // for all others, include the necessary headers (this file is usually all you
  33 // need because it includes almost all "standard" wxWindows headers)
  34 #ifndef WX_PRECOMP
  35     #include "wx/wx.h"
  36 #endif
  37
  38 #ifdef __WXMSW__
  39 #include <windows.h>
  40 #include "wx/msw/winundef.h"
  41 #endif
  42
  43 #include "wx/gizmos/splittree.h"
  44 #include <math.h>
  45
  46 /*
  47  * wxRemotelyScrolledTreeCtrl
  48  */
  49
  50 #if USE_GENERIC_TREECTRL
  51 IMPLEMENT_CLASS(wxRemotelyScrolledTreeCtrl, wxGenericTreeCtrl)
  52 #else
  53 IMPLEMENT_CLASS(wxRemotelyScrolledTreeCtrl, wxTreeCtrl)
  54 #endif
  55
  56 #if USE_GENERIC_TREECTRL
  57 BEGIN_EVENT_TABLE(wxRemotelyScrolledTreeCtrl, wxGenericTreeCtrl)
  58 #else
  59 BEGIN_EVENT_TABLE(wxRemotelyScrolledTreeCtrl, wxTreeCtrl)
  60 #endif
  61         EVT_SIZE(wxRemotelyScrolledTreeCtrl::OnSize)
  62         EVT_TREE_ITEM_EXPANDED(-1, wxRemotelyScrolledTreeCtrl::OnExpand)
  63         EVT_TREE_ITEM_COLLAPSED(-1, wxRemotelyScrolledTreeCtrl::OnExpand)
  64         EVT_SCROLLWIN(wxRemotelyScrolledTreeCtrl::OnScroll)
  65 END_EVENT_TABLE()
  66
  67 wxRemotelyScrolledTreeCtrl::wxRemotelyScrolledTreeCtrl(wxWindow* parent, wxWindowID id, const wxPoint& pt,
  68         const wxSize& sz, long style):
  69         wxTreeCtrl(parent, id, pt, sz, style)
  70 {
  71         m_companionWindow = NULL;
  72 }
  73
  74 wxRemotelyScrolledTreeCtrl::~wxRemotelyScrolledTreeCtrl()
  75 {
  76 }
  77
  78 void wxRemotelyScrolledTreeCtrl::HideVScrollbar()
  79 {
  80 #if defined(__WXMSW__) && USE_GENERIC_TREECTRL
  81     if (!IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
  82     {
  83         ::ShowScrollBar((HWND) GetHWND(), SB_VERT, FALSE);
  84     }
  85     else
  86 #endif
  87     {
  88         // Implicit in overriding SetScrollbars
  89     }
  90 }
  91
  92 // Number of pixels per user unit (0 or -1 for no scrollbar)
  93 // Length of virtual canvas in user units
  94 // Length of page in user units
  95 #if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
  96 void wxRemotelyScrolledTreeCtrl::SetScrollbars(int pixelsPerUnitX, int pixelsPerUnitY,
  97                              int noUnitsX, int noUnitsY,
  98                              int xPos, int yPos,
  99                              bool noRefresh)
 100 {
 101     if (IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
 102     {
 103         wxGenericTreeCtrl* win = (wxGenericTreeCtrl*) this;
 104         win->wxGenericTreeCtrl::SetScrollbars(pixelsPerUnitX, 0, noUnitsX, 0, xPos, 0, noRefresh);
 105
 106             wxScrolledWindow* scrolledWindow = GetScrolledWindow();
 107             if (scrolledWindow)
 108             {
 109             scrolledWindow->SetScrollbars(0, pixelsPerUnitY, 0, noUnitsY, 0, yPos, noRefresh);
 110         }
 111     }
 112 #else
 113 void wxRemotelyScrolledTreeCtrl::SetScrollbars(int WXUNUSED(pixelsPerUnitX), int WXUNUSED(pixelsPerUnitY),
 114                              int WXUNUSED(noUnitsX), int WXUNUSED(noUnitsY),
 115                              int WXUNUSED(xPos), int WXUNUSED(yPos),
 116                              bool WXUNUSED(noRefresh))
 117 {
 118 #endif
 119 }
 120
 121 // In case we're using the generic tree control.
 122 #if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
 123 int wxRemotelyScrolledTreeCtrl::GetScrollPos(int orient) const
 124 {
 125     wxScrolledWindow* scrolledWindow = GetScrolledWindow();
 126
 127     if (IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
 128     {
 129         wxGenericTreeCtrl* win = (wxGenericTreeCtrl*) this;
 130
 131         if (orient == wxHORIZONTAL)
 132             return win->wxGenericTreeCtrl::GetScrollPos(orient);
 133         else
 134         {
 135             return scrolledWindow->GetScrollPos(orient);
 136         }
 137     }
 138 #else
 139 int wxRemotelyScrolledTreeCtrl::GetScrollPos(int WXUNUSED(orient)) const
 140 {
 141 #endif
 142     return 0;
 143 }
 144
 145
 146 // In case we're using the generic tree control.
 147 // Get the view start
 148 void wxRemotelyScrolledTreeCtrl::GetViewStart(int *x, int *y) const
 149 {
 150     wxScrolledWindow* scrolledWindow = GetScrolledWindow();
 151
 152 #if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
 153     if (IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
 154     {
 155
 156         wxGenericTreeCtrl* win = (wxGenericTreeCtrl*) this;
 157         int x1, y1, x2, y2;
 158         win->wxGenericTreeCtrl::GetViewStart(& x1, & y1);
 159         * x = x1; * y = y1;
 160         if (!scrolledWindow)
 161             return;
 162
 163         scrolledWindow->GetViewStart(& x2, & y2);
 164         * y = y2;
 165     }
 166         else
 167 #endif
 168         {
 169                 // x is wrong since the horizontal scrollbar is controlled by the
 170                 // tree control, but we probably don't need it.
 171         scrolledWindow->GetViewStart(x, y);
 172         }
 173 }
 174
 175 // In case we're using the generic tree control.
 176 #if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
 177 void wxRemotelyScrolledTreeCtrl::PrepareDC(wxDC& dc)
 178 {
 179     if (IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
 180     {
 181             wxScrolledWindow* scrolledWindow = GetScrolledWindow();
 182
 183         wxGenericTreeCtrl* win = (wxGenericTreeCtrl*) this;
 184
 185         int startX, startY;
 186         GetViewStart(& startX, & startY);
 187
 188         int xppu1, yppu1, xppu2, yppu2;
 189         win->wxGenericTreeCtrl::GetScrollPixelsPerUnit(& xppu1, & yppu1);
 190         scrolledWindow->GetScrollPixelsPerUnit(& xppu2, & yppu2);
 191
 192         dc.SetDeviceOrigin( -startX * xppu1, -startY * yppu2 );
 193         // dc.SetUserScale( win->GetScaleX(), win->GetScaleY() );
 194     }
 195 #else
 196 void wxRemotelyScrolledTreeCtrl::PrepareDC(wxDC& WXUNUSED(dc))
 197 {
 198 #endif
 199 }
 200
 201 // Scroll to the given line (in scroll units where each unit is
 202 // the height of an item)
 203 void wxRemotelyScrolledTreeCtrl::ScrollToLine(int WXUNUSED(posHoriz), int posVert)
 204 {
 205 #ifdef __WXMSW__
 206 #if USE_GENERIC_TREECTRL
 207     if (!IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
 208 #endif
 209     {
 210             UINT sbCode = SB_THUMBPOSITION;
 211             HWND vertScrollBar = 0;
 212             MSWDefWindowProc((WXUINT) WM_VSCROLL, MAKELONG(sbCode, posVert), (WXLPARAM) vertScrollBar);
 213     }
 214 #if USE_GENERIC_TREECTRL
 215     else
 216 #endif
 217 #endif
 218 #if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
 219     {
 220         wxGenericTreeCtrl* win = (wxGenericTreeCtrl*) this;
 221                 win->Refresh();
 222                 /* Doesn't work yet because scrolling is ignored by Scroll
 223         int xppu, yppu;
 224             wxScrolledWindow* scrolledWindow = GetScrolledWindow();
 225             if (scrolledWindow)
 226             {
 227                         scrolledWindow->GetScrollPixelsPerUnit(& xppu, & yppu);
 228                         win->Scroll(-1, posVert*yppu);
 229                 }
 230                 */
 231     }
 232 #endif
 233 }
 234
 235 void wxRemotelyScrolledTreeCtrl::OnSize(wxSizeEvent& event)
 236 {
 237         HideVScrollbar();
 238         AdjustRemoteScrollbars();
 239         event.Skip();
 240 }
 241
 242 void wxRemotelyScrolledTreeCtrl::OnExpand(wxTreeEvent& event)
 243 {
 244         AdjustRemoteScrollbars();
 245         event.Skip();
 246
 247     // If we don't have this, we get some bits of lines still remaining
 248     if (event.GetEventType() == wxEVT_COMMAND_TREE_ITEM_COLLAPSED)
 249         Refresh();
 250
 251         // Pass on the event
 252         if (m_companionWindow)
 253                 m_companionWindow->GetEventHandler()->ProcessEvent(event);
 254 }
 255
 256 // Adjust the containing wxScrolledWindow's scrollbars appropriately
 257 void wxRemotelyScrolledTreeCtrl::AdjustRemoteScrollbars()
 258 {
 259 #if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
 260     if (IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
 261         {
 262                 // This is for the generic tree control.
 263                 // It calls SetScrollbars which has been overridden
 264                 // to adjust the parent scrolled window vertical
 265                 // scrollbar.
 266                 ((wxGenericTreeCtrl*) this)->AdjustMyScrollbars();
 267         return;
 268         }
 269         else
 270 #endif
 271         {
 272                 // This is for the wxMSW tree control
 273                 wxScrolledWindow* scrolledWindow = GetScrolledWindow();
 274                 if (scrolledWindow)
 275                 {
 276                         wxRect itemRect;
 277                         if (GetBoundingRect(GetRootItem(), itemRect))
 278                         {
 279                 // Actually, the real height seems to be 1 less than reported
 280                 // (e.g. 16 instead of 16)
 281                 int itemHeight = itemRect.GetHeight() - 1;
 282
 283                                 int w, h;
 284                                 GetClientSize(&w, &h);
 285
 286                                 wxRect rect(0, 0, 0, 0);
 287                                 CalcTreeSize(rect);
 288
 289                 double f = ((double) (rect.GetHeight()) / (double) itemHeight)  ;
 290                 int treeViewHeight = (int) ceil(f);
 291
 292                                 int scrollPixelsPerLine = itemHeight;
 293                                 int scrollPos = - (itemRect.y / itemHeight);
 294
 295                                 scrolledWindow->SetScrollbars(0, scrollPixelsPerLine, 0, treeViewHeight, 0, scrollPos);
 296
 297                                 // Ensure that when a scrollbar becomes hidden or visible,
 298                                 // the contained window sizes are right.
 299                                 // Problem: this is called too early (?)
 300                                 wxSizeEvent event(scrolledWindow->GetSize(), scrolledWindow->GetId());
 301                                 scrolledWindow->GetEventHandler()->ProcessEvent(event);
 302                         }
 303                 }
 304         }
 305 }
 306
 307
 308 // Calculate the area that contains both rectangles
 309 static wxRect CombineRectangles(const wxRect& rect1, const wxRect& rect2)
 310 {
 311     wxRect rect;
 312
 313     int right1 = rect1.GetRight();
 314     int bottom1 = rect1.GetBottom();
 315     int right2 = rect2.GetRight();
 316     int bottom2 = rect2.GetBottom();
 317
 318     wxPoint topLeft = wxPoint(wxMin(rect1.x, rect2.x), wxMin(rect1.y, rect2.y));
 319     wxPoint bottomRight = wxPoint(wxMax(right1, right2), wxMax(bottom1, bottom2));
 320
 321     rect.x = topLeft.x; rect.y = topLeft.y;
 322     rect.SetRight(bottomRight.x);
 323     rect.SetBottom(bottomRight.y);
 324
 325     return rect;
 326 }
 327
 328
 329 // Calculate the tree overall size so we can set the scrollbar
 330 // correctly
 331 void wxRemotelyScrolledTreeCtrl::CalcTreeSize(wxRect& rect)
 332 {
 333         CalcTreeSize(GetRootItem(), rect);
 334 }
 335
 336 void wxRemotelyScrolledTreeCtrl::CalcTreeSize(const wxTreeItemId& id, wxRect& rect)
 337 {
 338         // More efficient implementation would be to find the last item (but how?)
 339         // Q: is the bounding rect relative to the top of the virtual tree workspace
 340         // or the top of the window? How would we convert?
 341         wxRect itemSize;
 342         if (GetBoundingRect(id, itemSize))
 343         {
 344                 rect = CombineRectangles(rect, itemSize);
 345         }
 346
 347         void* cookie;
 348         wxTreeItemId childId = GetFirstChild(id, cookie);
 349         while (childId)
 350         {
 351                 CalcTreeSize(childId, rect);
 352                 childId = GetNextChild(childId, cookie);
 353         }
 354 }
 355
 356 // Find the scrolled window that contains this control
 357 wxScrolledWindow* wxRemotelyScrolledTreeCtrl::GetScrolledWindow() const
 358 {
 359         wxWindow* parent = wxWindow::GetParent();
 360         while (parent)
 361         {
 362                 if (parent->IsKindOf(CLASSINFO(wxScrolledWindow)))
 363                         return (wxScrolledWindow*) parent;
 364                 parent = parent->GetParent();
 365         }
 366         return NULL;
 367 }
 368
 369 void wxRemotelyScrolledTreeCtrl::OnScroll(wxScrollWinEvent& event)
 370 {
 371     int orient = event.GetOrientation();
 372     if (orient == wxHORIZONTAL)
 373     {
 374         event.Skip();
 375         return;
 376     }
 377     wxScrolledWindow* scrollWin = GetScrolledWindow();
 378     if (!scrollWin)
 379         return;
 380
 381     int x, y;
 382     scrollWin->GetViewStart(& x, & y);
 383
 384     ScrollToLine(-1, y);
 385 }
 386
 387 /*
 388  * wxTreeCompanionWindow
 389  *
 390  * A window displaying values associated with tree control items.
 391  */
 392
 393 IMPLEMENT_CLASS(wxTreeCompanionWindow, wxWindow)
 394
 395 BEGIN_EVENT_TABLE(wxTreeCompanionWindow, wxWindow)
 396         EVT_PAINT(wxTreeCompanionWindow::OnPaint)
 397         EVT_SCROLLWIN(wxTreeCompanionWindow::OnScroll)
 398         EVT_TREE_ITEM_EXPANDED(-1, wxTreeCompanionWindow::OnExpand)
 399         EVT_TREE_ITEM_COLLAPSED(-1, wxTreeCompanionWindow::OnExpand)
 400 END_EVENT_TABLE()
 401
 402 wxTreeCompanionWindow::wxTreeCompanionWindow(wxWindow* parent, wxWindowID id,
 403       const wxPoint& pos,
 404       const wxSize& sz,
 405       long style):
 406         wxWindow(parent, id, pos, sz, style)
 407 {
 408         m_treeCtrl = NULL;
 409 }
 410
 411 void wxTreeCompanionWindow::DrawItem(wxDC& dc, wxTreeItemId id, const wxRect& rect)
 412 {
 413         // TEST CODE
 414 #if 1
 415         if (m_treeCtrl)
 416         {
 417                 wxString text = m_treeCtrl->GetItemText(id);
 418                 dc.SetTextForeground(* wxBLACK);
 419                 dc.SetBackgroundMode(wxTRANSPARENT);
 420
 421                 int textW, textH;
 422                 dc.GetTextExtent(text, & textW, & textH);
 423
 424                 int x = 5;
 425                 int y = rect.GetY() + wxMax(0, (rect.GetHeight() - textH) / 2);
 426
 427                 dc.DrawText(text, x, y);
 428         }
 429 #endif
 430 }
 431
 432 void wxTreeCompanionWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 433 {
 434         wxPaintDC dc(this);
 435
 436     if (!m_treeCtrl)
 437         return;
 438
 439         wxPen pen(wxSystemSettings::GetColour(wxSYS_COLOUR_3DLIGHT), 1, wxSOLID);
 440         dc.SetPen(pen);
 441         dc.SetBrush(* wxTRANSPARENT_BRUSH);
 442         wxFont font(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));
 443         dc.SetFont(font);
 444
 445     wxSize clientSize = GetClientSize();
 446         wxRect itemRect;
 447         wxTreeItemId h, lastH;
 448         for(h=m_treeCtrl->GetFirstVisibleItem();h;h=m_treeCtrl->GetNextVisible(h))
 449         {
 450                 if (m_treeCtrl->GetBoundingRect(h, itemRect))
 451                 {
 452                         int cy = itemRect.GetTop();
 453                         wxRect drawItemRect(0, cy, clientSize.x, itemRect.GetHeight());
 454
 455                         lastH = h;
 456
 457                         // Draw the actual item
 458                         DrawItem(dc, h, drawItemRect);
 459                         dc.DrawLine(0, cy, clientSize.x, cy);
 460                 }
 461         }
 462         if (lastH.IsOk() && m_treeCtrl->GetBoundingRect(lastH, itemRect))
 463         {
 464                 int cy = itemRect.GetBottom();
 465                 dc.DrawLine(0, cy, clientSize.x, cy);
 466         }
 467 }
 468
 469 void wxTreeCompanionWindow::OnScroll(wxScrollWinEvent& event)
 470 {
 471     int orient = event.GetOrientation();
 472     if (orient == wxHORIZONTAL)
 473     {
 474         event.Skip();
 475         return;
 476     }
 477     if (!m_treeCtrl)
 478         return;
 479
 480         // TODO: scroll the window physically instead of just refreshing.
 481         Refresh(TRUE);
 482 }
 483
 484 void wxTreeCompanionWindow::OnExpand(wxTreeEvent& WXUNUSED(event))
 485 {
 486         // TODO: something more optimized than simply refresh the whole
 487         // window when the tree is expanded/collapsed. Tricky.
 488         Refresh();
 489 }
 490
 491 /*
 492  * wxThinSplitterWindow
 493  */
 494
 495 IMPLEMENT_CLASS(wxThinSplitterWindow, wxSplitterWindow)
 496
 497 BEGIN_EVENT_TABLE(wxThinSplitterWindow, wxSplitterWindow)
 498         EVT_SIZE(wxThinSplitterWindow::OnSize)
 499 END_EVENT_TABLE()
 500
 501 wxThinSplitterWindow::wxThinSplitterWindow(wxWindow* parent, wxWindowID id,
 502       const wxPoint& pos,
 503       const wxSize& sz,
 504       long style):
 505       wxSplitterWindow(parent, id, pos, sz, style)
 506 {
 507 }
 508
 509 wxThinSplitterWindow::~wxThinSplitterWindow()
 510 {
 511 }
 512
 513 void wxThinSplitterWindow::SizeWindows()
 514 {
 515         // The client size may have changed inbetween
 516         // the sizing of the first window and the sizing of
 517         // the second. So repeat SizeWindows.
 518     wxSplitterWindow::SizeWindows();
 519     wxSplitterWindow::SizeWindows();
 520 }
 521
 522 // Tests for x, y over sash
 523 bool wxThinSplitterWindow::SashHitTest(int x, int y, int WXUNUSED(tolerance))
 524 {
 525         return wxSplitterWindow::SashHitTest(x, y, 4);
 526 }
 527
 528 void wxThinSplitterWindow::DrawSash(wxDC& dc)
 529 {
 530     if ( GetSashPosition() == 0 || !m_windowTwo)
 531         return;
 532     if (GetWindowStyle() & wxSP_NOSASH)
 533         return;
 534
 535     int w, h;
 536     GetClientSize(&w, &h);
 537
 538         if ( m_splitMode == wxSPLIT_VERTICAL )
 539         {
 540                 dc.SetPen(* m_facePen);
 541                 dc.SetBrush(* m_faceBrush);
 542                 int h1 = h-1;
 543                 int y1 = 0;
 544                 if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER && (GetWindowStyleFlag() & wxSP_3DBORDER) != wxSP_3DBORDER )
 545                         h1 += 1; // Not sure why this is necessary...
 546                 if ( (GetWindowStyleFlag() & wxSP_3DBORDER) == wxSP_3DBORDER)
 547                 {
 548                         y1 = 2; h1 -= 3;
 549                 }
 550                 dc.DrawRectangle(GetSashPosition(), y1, GetSashSize(), h1);
 551         }
 552         else
 553         {
 554                 dc.SetPen(* m_facePen);
 555                 dc.SetBrush(* m_faceBrush);
 556                 int w1 = w-1;
 557                 int x1 = 0;
 558                 if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER && (GetWindowStyleFlag() & wxSP_3DBORDER) != wxSP_3DBORDER )
 559                         w1 ++;
 560                 if ( (GetWindowStyleFlag() & wxSP_3DBORDER) == wxSP_3DBORDER)
 561                 {
 562                         x1 = 2; w1 -= 3;
 563                 }
 564                 dc.DrawRectangle(x1, GetSashPosition(), w1, GetSashSize());
 565         }
 566
 567     dc.SetPen(wxNullPen);
 568     dc.SetBrush(wxNullBrush);
 569 }
 570
 571 void wxThinSplitterWindow::OnSize(wxSizeEvent& event)
 572 {
 573         wxSplitterWindow::OnSize(event);
 574 }
 575
 576 /*
 577  * wxSplitterScrolledWindow
 578  */
 579
 580 IMPLEMENT_CLASS(wxSplitterScrolledWindow, wxScrolledWindow)
 581
 582 BEGIN_EVENT_TABLE(wxSplitterScrolledWindow, wxScrolledWindow)
 583         EVT_SCROLLWIN(wxSplitterScrolledWindow::OnScroll)
 584         EVT_SIZE(wxSplitterScrolledWindow::OnSize)
 585 END_EVENT_TABLE()
 586
 587 wxSplitterScrolledWindow::wxSplitterScrolledWindow(wxWindow* parent, wxWindowID id,
 588       const wxPoint& pos,
 589       const wxSize& sz,
 590       long style):
 591       wxScrolledWindow(parent, id, pos, sz, style)
 592 {
 593 }
 594
 595 void wxSplitterScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 596 {
 597         wxSize sz = GetClientSize();
 598         if (GetChildren().GetFirst())
 599         {
 600                 ((wxWindow*) GetChildren().GetFirst()->GetData())->SetSize(0, 0, sz.x, sz.y);
 601         }
 602 }
 603
 604 void wxSplitterScrolledWindow::OnScroll(wxScrollWinEvent& event)
 605 {
 606     // Ensure that events being propagated back up the window hierarchy
 607     // don't cause an infinite loop
 608     static bool inOnScroll = FALSE;
 609     if (inOnScroll)
 610     {
 611         event.Skip();
 612         return;
 613     }
 614     inOnScroll = TRUE;
 615
 616     int orient = event.GetOrientation();
 617
 618     int nScrollInc = CalcScrollInc(event);
 619     if (nScrollInc == 0)
 620     {
 621         inOnScroll = FALSE;
 622         return;
 623     }
 624
 625     if (orient == wxHORIZONTAL)
 626     {
 627         inOnScroll = FALSE;
 628         event.Skip();
 629         return;
 630 #if 0
 631         int newPos = m_xScrollPosition + nScrollInc;
 632         SetScrollPos(wxHORIZONTAL, newPos, TRUE );
 633 #endif
 634     }
 635     else
 636     {
 637         int newPos = m_yScrollPosition + nScrollInc;
 638         SetScrollPos(wxVERTICAL, newPos, TRUE );
 639     }
 640
 641     if (orient == wxHORIZONTAL)
 642     {
 643         m_xScrollPosition += nScrollInc;
 644     }
 645     else
 646     {
 647         m_yScrollPosition += nScrollInc;
 648     }
 649
 650     // Find targets in splitter window and send the event to them
 651     wxNode* node = (wxNode *)GetChildren().GetFirst();
 652     while (node)
 653     {
 654         wxWindow* child = (wxWindow*) node->GetData();
 655         if (child->IsKindOf(CLASSINFO(wxSplitterWindow)))
 656         {
 657             wxSplitterWindow* splitter = (wxSplitterWindow*) child;
 658             if (splitter->GetWindow1())
 659                 splitter->GetWindow1()->ProcessEvent(event);
 660             if (splitter->GetWindow2())
 661                 splitter->GetWindow2()->ProcessEvent(event);
 662             break;
 663         }
 664         node = node->GetNext();
 665     }
 666
 667 #ifdef __WXMAC__
 668     m_targetWindow->MacUpdateImmediately() ;
 669 #endif
 670
 671     inOnScroll = FALSE;
 672 }
 673