contrib/src/gizmos/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 #ifdef __GNUG__
  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_PAINT(wxRemotelyScrolledTreeCtrl::OnPaint)
  63     EVT_TREE_ITEM_EXPANDED(-1, wxRemotelyScrolledTreeCtrl::OnExpand)
  64     EVT_TREE_ITEM_COLLAPSED(-1, wxRemotelyScrolledTreeCtrl::OnExpand)
  65     EVT_SCROLLWIN(wxRemotelyScrolledTreeCtrl::OnScroll)
  66 END_EVENT_TABLE()
  67
  68 wxRemotelyScrolledTreeCtrl::wxRemotelyScrolledTreeCtrl(
  69     wxWindow* parent, wxWindowID id, const wxPoint& pt,
  70     const wxSize& sz, long style)
  71     : wxTreeCtrl(parent, id, pt, sz, style & ~wxTR_ROW_LINES)
  72 {
  73     m_companionWindow = NULL;
  74
  75     // We draw the row lines ourself so they match what's done
  76     // by the companion window.  That is why the flag is turned
  77     // off above, so wxGenericTreeCtrl doesn't draw them in a
  78     // different colour.
  79     m_drawRowLines = (style & wxTR_ROW_LINES) != 0;
  80 }
  81
  82 wxRemotelyScrolledTreeCtrl::~wxRemotelyScrolledTreeCtrl()
  83 {
  84 }
  85
  86 void wxRemotelyScrolledTreeCtrl::HideVScrollbar()
  87 {
  88 #if defined(__WXMSW__)
  89 #if USE_GENERIC_TREECTRL
  90     if (!IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
  91 #endif
  92     {
  93         ::ShowScrollBar((HWND) GetHWND(), SB_VERT, FALSE);
  94     }
  95 #if USE_GENERIC_TREECTRL
  96     else
  97     {
  98         // Implicit in overriding SetScrollbars
  99     }
 100 #endif
 101 #endif
 102 }
 103
 104 // Number of pixels per user unit (0 or -1 for no scrollbar)
 105 // Length of virtual canvas in user units
 106 // Length of page in user units
 107 void wxRemotelyScrolledTreeCtrl::SetScrollbars(
 108                                                 #if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
 109                                                   int pixelsPerUnitX, int pixelsPerUnitY,
 110                              int noUnitsX, int noUnitsY,
 111                              int xPos, int yPos,
 112                                                   bool noRefresh
 113                                                 #else
 114                                                   int WXUNUSED(pixelsPerUnitX), int WXUNUSED(pixelsPerUnitY),
 115                                                   int WXUNUSED(noUnitsX), int WXUNUSED(noUnitsY),
 116                                                   int WXUNUSED(xPos), int WXUNUSED(yPos),
 117                                                   bool WXUNUSED(noRefresh)
 118                                                 #endif
 119                                               )
 120 {
 121 #if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
 122     if (IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
 123     {
 124         wxGenericTreeCtrl* win = (wxGenericTreeCtrl*) this;
 125         win->wxGenericTreeCtrl::SetScrollbars(pixelsPerUnitX, pixelsPerUnitY, noUnitsX, 0, xPos, 0, /* noRefresh */ TRUE);
 126
 127         wxScrolledWindow* scrolledWindow = GetScrolledWindow();
 128         if (scrolledWindow)
 129         {
 130             scrolledWindow->SetScrollbars(0, pixelsPerUnitY, 0, noUnitsY, 0, yPos, noRefresh);
 131         }
 132     }
 133 #endif
 134 }
 135
 136 // In case we're using the generic tree control.
 137 int wxRemotelyScrolledTreeCtrl::GetScrollPos(
 138                                              #if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
 139                                                  int orient
 140                                              #else
 141                                                  int WXUNUSED(orient)
 142                                              #endif
 143                                              ) const
 144 {
 145
 146 #if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
 147     // this condition fixes extsitence of warning but
 148     wxScrolledWindow* scrolledWindow =
 149     // but GetScrolledWindow is still executed in case internally does something
 150 #endif
 151                                        GetScrolledWindow();
 152
 153 #if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
 154     if (IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
 155     {
 156         wxGenericTreeCtrl* win = (wxGenericTreeCtrl*) this;
 157
 158         if (orient == wxHORIZONTAL)
 159             return win->wxGenericTreeCtrl::GetScrollPos(orient);
 160         else
 161         {
 162             return scrolledWindow->GetScrollPos(orient);
 163         }
 164     }
 165 #endif
 166     return 0;
 167 }
 168
 169
 170 // In case we're using the generic tree control.
 171 // Get the view start
 172 void wxRemotelyScrolledTreeCtrl::GetViewStart(int *x, int *y) const
 173 {
 174     wxScrolledWindow* scrolledWindow = GetScrolledWindow();
 175
 176 #if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
 177     if (IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
 178     {
 179
 180         wxGenericTreeCtrl* win = (wxGenericTreeCtrl*) this;
 181         int x1, y1, x2, y2;
 182         win->wxGenericTreeCtrl::GetViewStart(& x1, & y1);
 183         * x = x1; * y = y1;
 184         if (!scrolledWindow)
 185             return;
 186
 187         scrolledWindow->GetViewStart(& x2, & y2);
 188         * y = y2;
 189     }
 190     else
 191 #endif
 192     {
 193         // x is wrong since the horizontal scrollbar is controlled by the
 194         // tree control, but we probably don't need it.
 195         scrolledWindow->GetViewStart(x, y);
 196     }
 197 }
 198
 199 // In case we're using the generic tree control.
 200 void wxRemotelyScrolledTreeCtrl::PrepareDC(
 201                                             #if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
 202                                                 wxDC& dc
 203                                             #else
 204                                                 wxDC& WXUNUSED(dc)
 205                                             #endif
 206                                            )
 207 {
 208 #if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
 209     if (IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
 210     {
 211         wxScrolledWindow* scrolledWindow = GetScrolledWindow();
 212
 213         wxGenericTreeCtrl* win = (wxGenericTreeCtrl*) this;
 214
 215         int startX, startY;
 216         GetViewStart(& startX, & startY);
 217
 218         int xppu1, yppu1, xppu2, yppu2;
 219         win->wxGenericTreeCtrl::GetScrollPixelsPerUnit(& xppu1, & yppu1);
 220         scrolledWindow->GetScrollPixelsPerUnit(& xppu2, & yppu2);
 221
 222         dc.SetDeviceOrigin( -startX * xppu1, -startY * yppu2 );
 223         // dc.SetUserScale( win->GetScaleX(), win->GetScaleY() );
 224     }
 225 #endif
 226 }
 227
 228 // Scroll to the given line (in scroll units where each unit is
 229 // the height of an item)
 230 void wxRemotelyScrolledTreeCtrl::ScrollToLine(int WXUNUSED(posHoriz), int posVert)
 231 {
 232 #ifdef __WXMSW__
 233 #if USE_GENERIC_TREECTRL
 234     if (!IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
 235 #endif
 236     {
 237         UINT sbCode = SB_THUMBPOSITION;
 238         HWND vertScrollBar = 0;
 239         MSWDefWindowProc((WXUINT) WM_VSCROLL, MAKELONG(sbCode, posVert), (WXHWND) vertScrollBar);
 240     }
 241 #if USE_GENERIC_TREECTRL
 242     else
 243 #endif
 244 #endif
 245 #if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
 246     {
 247         wxGenericTreeCtrl* win = (wxGenericTreeCtrl*) this;
 248         win->Refresh();
 249         /* Doesn't work yet because scrolling is ignored by Scroll
 250         int xppu, yppu;
 251         wxScrolledWindow* scrolledWindow = GetScrolledWindow();
 252         if (scrolledWindow)
 253         {
 254             scrolledWindow->GetScrollPixelsPerUnit(& xppu, & yppu);
 255             win->Scroll(-1, posVert*yppu);
 256         }
 257         */
 258     }
 259 #endif
 260 }
 261
 262 void wxRemotelyScrolledTreeCtrl::OnSize(wxSizeEvent& event)
 263 {
 264     HideVScrollbar();
 265     AdjustRemoteScrollbars();
 266     event.Skip();
 267 }
 268
 269 void wxRemotelyScrolledTreeCtrl::OnExpand(wxTreeEvent& event)
 270 {
 271     AdjustRemoteScrollbars();
 272     event.Skip();
 273
 274     // If we don't have this, we get some bits of lines still remaining
 275     if (event.GetEventType() == wxEVT_COMMAND_TREE_ITEM_COLLAPSED)
 276         Refresh();
 277
 278     // Pass on the event
 279     if (m_companionWindow)
 280         m_companionWindow->GetEventHandler()->ProcessEvent(event);
 281 }
 282
 283 void wxRemotelyScrolledTreeCtrl::OnPaint(wxPaintEvent& event)
 284 {
 285     wxPaintDC dc(this);
 286
 287     wxTreeCtrl::OnPaint(event);
 288
 289     if (! m_drawRowLines)
 290         return;
 291
 292     // Reset the device origin since it may have been set
 293     dc.SetDeviceOrigin(0, 0);
 294
 295     wxPen pen(wxSystemSettings::GetColour(wxSYS_COLOUR_3DLIGHT), 1, wxSOLID);
 296     dc.SetPen(pen);
 297     dc.SetBrush(* wxTRANSPARENT_BRUSH);
 298
 299     wxSize clientSize = GetClientSize();
 300     wxRect itemRect;
 301     int cy=0;
 302     wxTreeItemId h, lastH;
 303     for(h=GetFirstVisibleItem();h;h=GetNextVisible(h))
 304     {
 305         if (GetBoundingRect(h, itemRect))
 306         {
 307             cy = itemRect.GetTop();
 308             dc.DrawLine(0, cy, clientSize.x, cy);
 309             lastH = h;
 310         }
 311     }
 312     if (lastH.IsOk() && GetBoundingRect(lastH, itemRect))
 313     {
 314         cy = itemRect.GetBottom();
 315         dc.DrawLine(0, cy, clientSize.x, cy);
 316     }
 317 }
 318
 319
 320 // Adjust the containing wxScrolledWindow's scrollbars appropriately
 321 void wxRemotelyScrolledTreeCtrl::AdjustRemoteScrollbars()
 322 {
 323 #if USE_GENERIC_TREECTRL || !defined(__WXMSW__)
 324     if (IsKindOf(CLASSINFO(wxGenericTreeCtrl)))
 325     {
 326         // This is for the generic tree control.
 327         // It calls SetScrollbars which has been overridden
 328         // to adjust the parent scrolled window vertical
 329         // scrollbar.
 330         ((wxGenericTreeCtrl*) this)->AdjustMyScrollbars();
 331         return;
 332     }
 333     else
 334 #endif
 335     {
 336         // This is for the wxMSW tree control
 337         wxScrolledWindow* scrolledWindow = GetScrolledWindow();
 338         if (scrolledWindow)
 339         {
 340             wxRect itemRect;
 341             if (GetBoundingRect(GetFirstVisibleItem(), itemRect))
 342             {
 343                 // Actually, the real height seems to be 1 less than reported
 344                 // (e.g. 16 instead of 16)
 345                 int itemHeight = itemRect.GetHeight() - 1;
 346
 347                 int w, h;
 348                 GetClientSize(&w, &h);
 349
 350                 wxRect rect(0, 0, 0, 0);
 351                 CalcTreeSize(rect);
 352
 353                 double f = ((double) (rect.GetHeight()) / (double) itemHeight)  ;
 354                 int treeViewHeight = (int) ceil(f);
 355
 356                 int scrollPixelsPerLine = itemHeight;
 357                 int scrollPos = - (itemRect.y / itemHeight);
 358
 359                 scrolledWindow->SetScrollbars(0, scrollPixelsPerLine, 0, treeViewHeight, 0, scrollPos);
 360
 361                 // Ensure that when a scrollbar becomes hidden or visible,
 362                 // the contained window sizes are right.
 363                 // Problem: this is called too early (?)
 364                 wxSizeEvent event(scrolledWindow->GetSize(), scrolledWindow->GetId());
 365                 scrolledWindow->GetEventHandler()->ProcessEvent(event);
 366             }
 367         }
 368     }
 369 }
 370
 371
 372 // Calculate the area that contains both rectangles
 373 static wxRect CombineRectangles(const wxRect& rect1, const wxRect& rect2)
 374 {
 375     wxRect rect;
 376
 377     int right1 = rect1.GetRight();
 378     int bottom1 = rect1.GetBottom();
 379     int right2 = rect2.GetRight();
 380     int bottom2 = rect2.GetBottom();
 381
 382     wxPoint topLeft = wxPoint(wxMin(rect1.x, rect2.x), wxMin(rect1.y, rect2.y));
 383     wxPoint bottomRight = wxPoint(wxMax(right1, right2), wxMax(bottom1, bottom2));
 384
 385     rect.x = topLeft.x; rect.y = topLeft.y;
 386     rect.SetRight(bottomRight.x);
 387     rect.SetBottom(bottomRight.y);
 388
 389     return rect;
 390 }
 391
 392
 393 // Calculate the tree overall size so we can set the scrollbar
 394 // correctly
 395 void wxRemotelyScrolledTreeCtrl::CalcTreeSize(wxRect& rect)
 396 {
 397     CalcTreeSize(GetRootItem(), rect);
 398 }
 399
 400 void wxRemotelyScrolledTreeCtrl::CalcTreeSize(const wxTreeItemId& id, wxRect& rect)
 401 {
 402     // More efficient implementation would be to find the last item (but how?)
 403     // Q: is the bounding rect relative to the top of the virtual tree workspace
 404     // or the top of the window? How would we convert?
 405     wxRect itemSize;
 406     if (GetBoundingRect(id, itemSize))
 407     {
 408         rect = CombineRectangles(rect, itemSize);
 409     }
 410
 411     wxTreeItemIdValue cookie;
 412     wxTreeItemId childId = GetFirstChild(id, cookie);
 413     while (childId)
 414     {
 415         CalcTreeSize(childId, rect);
 416         childId = GetNextChild(childId, cookie);
 417     }
 418 }
 419
 420 // Find the scrolled window that contains this control
 421 wxScrolledWindow* wxRemotelyScrolledTreeCtrl::GetScrolledWindow() const
 422 {
 423     wxWindow* parent = wxWindow::GetParent();
 424     while (parent)
 425     {
 426         if (parent->IsKindOf(CLASSINFO(wxScrolledWindow)))
 427             return (wxScrolledWindow*) parent;
 428         parent = parent->GetParent();
 429     }
 430     return NULL;
 431 }
 432
 433 void wxRemotelyScrolledTreeCtrl::OnScroll(wxScrollWinEvent& event)
 434 {
 435     int orient = event.GetOrientation();
 436     if (orient == wxHORIZONTAL)
 437     {
 438         event.Skip();
 439         return;
 440     }
 441     wxScrolledWindow* scrollWin = GetScrolledWindow();
 442     if (!scrollWin)
 443         return;
 444
 445     int x, y;
 446     scrollWin->GetViewStart(& x, & y);
 447
 448     ScrollToLine(-1, y);
 449 }
 450
 451 /*
 452  * wxTreeCompanionWindow
 453  *
 454  * A window displaying values associated with tree control items.
 455  */
 456
 457 IMPLEMENT_CLASS(wxTreeCompanionWindow, wxWindow)
 458
 459 BEGIN_EVENT_TABLE(wxTreeCompanionWindow, wxWindow)
 460     EVT_PAINT(wxTreeCompanionWindow::OnPaint)
 461     EVT_SCROLLWIN(wxTreeCompanionWindow::OnScroll)
 462     EVT_TREE_ITEM_EXPANDED(-1, wxTreeCompanionWindow::OnExpand)
 463     EVT_TREE_ITEM_COLLAPSED(-1, wxTreeCompanionWindow::OnExpand)
 464 END_EVENT_TABLE()
 465
 466 wxTreeCompanionWindow::wxTreeCompanionWindow(wxWindow* parent, wxWindowID id,
 467       const wxPoint& pos,
 468       const wxSize& sz,
 469       long style):
 470     wxWindow(parent, id, pos, sz, style)
 471 {
 472     m_treeCtrl = NULL;
 473 }
 474
 475 void wxTreeCompanionWindow::DrawItem(wxDC& dc, wxTreeItemId id, const wxRect& rect)
 476 {
 477     // TEST CODE
 478 #if 1
 479     if (m_treeCtrl)
 480     {
 481         wxString text = m_treeCtrl->GetItemText(id);
 482         dc.SetTextForeground(* wxBLACK);
 483         dc.SetBackgroundMode(wxTRANSPARENT);
 484
 485         int textW, textH;
 486         dc.GetTextExtent(text, & textW, & textH);
 487
 488         int x = 5;
 489         int y = rect.GetY() + wxMax(0, (rect.GetHeight() - textH) / 2);
 490
 491         dc.DrawText(text, x, y);
 492     }
 493 #endif
 494 }
 495
 496 void wxTreeCompanionWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 497 {
 498     wxPaintDC dc(this);
 499
 500     if (!m_treeCtrl)
 501         return;
 502
 503         wxPen pen(wxSystemSettings::GetColour(wxSYS_COLOUR_3DLIGHT), 1, wxSOLID);
 504     dc.SetPen(pen);
 505     dc.SetBrush(* wxTRANSPARENT_BRUSH);
 506     wxFont font(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));
 507     dc.SetFont(font);
 508
 509     wxSize clientSize = GetClientSize();
 510     wxRect itemRect;
 511     int cy=0;
 512     wxTreeItemId h, lastH;
 513     for(h=m_treeCtrl->GetFirstVisibleItem();h;h=m_treeCtrl->GetNextVisible(h))
 514     {
 515         if (m_treeCtrl->GetBoundingRect(h, itemRect))
 516         {
 517             cy = itemRect.GetTop();
 518             wxRect drawItemRect(0, cy, clientSize.x, itemRect.GetHeight());
 519
 520             lastH = h;
 521
 522             // Draw the actual item
 523             DrawItem(dc, h, drawItemRect);
 524             dc.DrawLine(0, cy, clientSize.x, cy);
 525         }
 526     }
 527     if (lastH.IsOk() && m_treeCtrl->GetBoundingRect(lastH, itemRect))
 528     {
 529         cy = itemRect.GetBottom();
 530         dc.DrawLine(0, cy, clientSize.x, cy);
 531     }
 532 }
 533
 534 void wxTreeCompanionWindow::OnScroll(wxScrollWinEvent& event)
 535 {
 536     int orient = event.GetOrientation();
 537     if (orient == wxHORIZONTAL)
 538     {
 539         event.Skip();
 540         return;
 541     }
 542     if (!m_treeCtrl)
 543         return;
 544
 545     // TODO: scroll the window physically instead of just refreshing.
 546     Refresh(TRUE);
 547 }
 548
 549 void wxTreeCompanionWindow::OnExpand(wxTreeEvent& WXUNUSED(event))
 550 {
 551     // TODO: something more optimized than simply refresh the whole
 552     // window when the tree is expanded/collapsed. Tricky.
 553     Refresh();
 554 }
 555
 556 /*
 557  * wxThinSplitterWindow
 558  */
 559
 560 IMPLEMENT_CLASS(wxThinSplitterWindow, wxSplitterWindow)
 561
 562 BEGIN_EVENT_TABLE(wxThinSplitterWindow, wxSplitterWindow)
 563     EVT_SIZE(wxThinSplitterWindow::OnSize)
 564 END_EVENT_TABLE()
 565
 566 wxThinSplitterWindow::wxThinSplitterWindow(wxWindow* parent, wxWindowID id,
 567       const wxPoint& pos,
 568       const wxSize& sz,
 569       long style):
 570       wxSplitterWindow(parent, id, pos, sz, style)
 571 {
 572     wxColour faceColour(wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE));
 573     m_facePen = new wxPen(faceColour, 1, wxSOLID);
 574     m_faceBrush = new wxBrush(faceColour, wxSOLID);
 575 }
 576
 577 wxThinSplitterWindow::~wxThinSplitterWindow()
 578 {
 579     delete m_facePen;
 580     delete m_faceBrush;
 581 }
 582
 583
 584 void wxThinSplitterWindow::SizeWindows()
 585 {
 586     // The client size may have changed inbetween
 587     // the sizing of the first window and the sizing of
 588     // the second. So repeat SizeWindows.
 589     wxSplitterWindow::SizeWindows();
 590     wxSplitterWindow::SizeWindows();
 591 }
 592
 593 // Tests for x, y over sash
 594 bool wxThinSplitterWindow::SashHitTest(int x, int y, int WXUNUSED(tolerance))
 595 {
 596     return wxSplitterWindow::SashHitTest(x, y, 4);
 597 }
 598
 599 void wxThinSplitterWindow::DrawSash(wxDC& dc)
 600 {
 601     if ( m_sashPosition == 0 || !m_windowTwo)
 602         return;
 603     if (GetWindowStyle() & wxSP_NOSASH)
 604         return;
 605
 606     int w, h;
 607     GetClientSize(&w, &h);
 608
 609     if ( m_splitMode == wxSPLIT_VERTICAL )
 610     {
 611         dc.SetPen(* m_facePen);
 612         dc.SetBrush(* m_faceBrush);
 613         int h1 = h-1;
 614         int y1 = 0;
 615         if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER && (GetWindowStyleFlag() & wxSP_3DBORDER) != wxSP_3DBORDER )
 616             h1 += 1; // Not sure why this is necessary...
 617         if ( (GetWindowStyleFlag() & wxSP_3DBORDER) == wxSP_3DBORDER)
 618         {
 619             y1 = 2; h1 -= 3;
 620         }
 621         dc.DrawRectangle(m_sashPosition, y1, GetSashSize(), h1);
 622     }
 623     else
 624     {
 625         dc.SetPen(* m_facePen);
 626         dc.SetBrush(* m_faceBrush);
 627         int w1 = w-1;
 628         int x1 = 0;
 629         if ( (GetWindowStyleFlag() & wxSP_BORDER) != wxSP_BORDER && (GetWindowStyleFlag() & wxSP_3DBORDER) != wxSP_3DBORDER )
 630             w1 ++;
 631         if ( (GetWindowStyleFlag() & wxSP_3DBORDER) == wxSP_3DBORDER)
 632         {
 633             x1 = 2; w1 -= 3;
 634         }
 635         dc.DrawRectangle(x1, m_sashPosition, w1, GetSashSize());
 636     }
 637
 638     dc.SetPen(wxNullPen);
 639     dc.SetBrush(wxNullBrush);
 640 }
 641
 642 void wxThinSplitterWindow::OnSize(wxSizeEvent& event)
 643 {
 644     wxSplitterWindow::OnSize(event);
 645 }
 646
 647 /*
 648  * wxSplitterScrolledWindow
 649  */
 650
 651 IMPLEMENT_CLASS(wxSplitterScrolledWindow, wxScrolledWindow)
 652
 653 BEGIN_EVENT_TABLE(wxSplitterScrolledWindow, wxScrolledWindow)
 654     EVT_SCROLLWIN(wxSplitterScrolledWindow::OnScroll)
 655     EVT_SIZE(wxSplitterScrolledWindow::OnSize)
 656 END_EVENT_TABLE()
 657
 658 wxSplitterScrolledWindow::wxSplitterScrolledWindow(wxWindow* parent, wxWindowID id,
 659       const wxPoint& pos,
 660       const wxSize& sz,
 661       long style):
 662       wxScrolledWindow(parent, id, pos, sz, style)
 663 {
 664 }
 665
 666 void wxSplitterScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 667 {
 668     wxSize sz = GetClientSize();
 669     if (GetChildren().GetFirst())
 670     {
 671         ((wxWindow*) GetChildren().GetFirst()->GetData())->SetSize(0, 0, sz.x, sz.y);
 672     }
 673 }
 674
 675 void wxSplitterScrolledWindow::OnScroll(wxScrollWinEvent& event)
 676 {
 677     // Ensure that events being propagated back up the window hierarchy
 678     // don't cause an infinite loop
 679     static bool inOnScroll = FALSE;
 680     if (inOnScroll)
 681     {
 682         event.Skip();
 683         return;
 684     }
 685     inOnScroll = TRUE;
 686
 687     int orient = event.GetOrientation();
 688
 689     int nScrollInc = CalcScrollInc(event);
 690     if (nScrollInc == 0)
 691     {
 692         inOnScroll = FALSE;
 693         return;
 694     }
 695
 696     if (orient == wxHORIZONTAL)
 697     {
 698         inOnScroll = FALSE;
 699         event.Skip();
 700         return;
 701 #if 0
 702         int newPos = m_xScrollPosition + nScrollInc;
 703         SetScrollPos(wxHORIZONTAL, newPos, TRUE );
 704 #endif
 705     }
 706     else
 707     {
 708         int newPos = m_yScrollPosition + nScrollInc;
 709         SetScrollPos(wxVERTICAL, newPos, TRUE );
 710     }
 711
 712     if (orient == wxHORIZONTAL)
 713     {
 714         m_xScrollPosition += nScrollInc;
 715     }
 716     else
 717     {
 718         m_yScrollPosition += nScrollInc;
 719     }
 720
 721     // Find targets in splitter window and send the event to them
 722     wxWindowListNode* node = GetChildren().GetFirst();
 723     while (node)
 724     {
 725         wxWindow* child = (wxWindow*) node->GetData();
 726         if (child->IsKindOf(CLASSINFO(wxSplitterWindow)))
 727         {
 728             wxSplitterWindow* splitter = (wxSplitterWindow*) child;
 729             if (splitter->GetWindow1())
 730                 splitter->GetWindow1()->ProcessEvent(event);
 731             if (splitter->GetWindow2())
 732                 splitter->GetWindow2()->ProcessEvent(event);
 733             break;
 734         }
 735         node = node->GetNext();
 736     }
 737
 738 #ifdef __WXMAC__
 739     m_targetWindow->MacUpdateImmediately() ;
 740 #endif
 741
 742     inOnScroll = FALSE;
 743 }
 744