src/generic/vscroll.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/generic/vscroll.cpp
   3 // Purpose:     wxVScrolledWindow implementation
   4 // Author:      Vadim Zeitlin
   5 // Modified by: Brad Anderson
   6 // Created:     30.05.03
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2003 Vadim Zeitlin <vadim@wxwindows.org>
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24 #pragma hdrstop
  25 #endif
  26
  27 #ifndef WX_PRECOMP
  28     #include "wx/dc.h"
  29     #include "wx/sizer.h"
  30 #endif
  31
  32 #include "wx/vscroll.h"
  33
  34 // ============================================================================
  35 // wxVarScrollHelperEvtHandler declaration
  36 // ============================================================================
  37
  38 // ----------------------------------------------------------------------------
  39 // wxScrollHelperEvtHandler: intercept the events from the window and forward
  40 // them to wxVarScrollHelperBase
  41 // ----------------------------------------------------------------------------
  42
  43 class WXDLLEXPORT wxVarScrollHelperEvtHandler : public wxEvtHandler
  44 {
  45 public:
  46     wxVarScrollHelperEvtHandler(wxVarScrollHelperBase *scrollHelper)
  47     {
  48         m_scrollHelper = scrollHelper;
  49     }
  50
  51     virtual bool ProcessEvent(wxEvent& event);
  52
  53 private:
  54     wxVarScrollHelperBase *m_scrollHelper;
  55
  56     DECLARE_NO_COPY_CLASS(wxVarScrollHelperEvtHandler)
  57 };
  58
  59 // ============================================================================
  60 // wxVarScrollHelperEvtHandler implementation
  61 // ============================================================================
  62
  63 bool wxVarScrollHelperEvtHandler::ProcessEvent(wxEvent& event)
  64 {
  65     wxEventType evType = event.GetEventType();
  66
  67     // pass it on to the real handler
  68     bool processed = wxEvtHandler::ProcessEvent(event);
  69
  70     // always process the size events ourselves, even if the user code handles
  71     // them as well, as we need to AdjustScrollbars()
  72     //
  73     // NB: it is important to do it after processing the event in the normal
  74     //     way as HandleOnSize() may generate a wxEVT_SIZE itself if the
  75     //     scrollbar[s] (dis)appear and it should be seen by the user code
  76     //     after this one
  77     if ( evType == wxEVT_SIZE )
  78     {
  79         m_scrollHelper->HandleOnSize((wxSizeEvent &)event);
  80
  81         return !event.GetSkipped();
  82     }
  83
  84     if ( processed )
  85     {
  86         // normally, nothing more to do here - except if we have a command
  87         // event
  88         if ( event.IsCommandEvent() )
  89         {
  90             return true;
  91         }
  92     }
  93
  94     // reset the skipped flag (which might have been set to true in
  95     // ProcessEvent() above) to be able to test it below
  96     bool wasSkipped = event.GetSkipped();
  97     if ( wasSkipped )
  98         event.Skip(false);
  99
 100     // reset the skipped flag to false as it might have been set to true in
 101     // ProcessEvent() above
 102     event.Skip(false);
 103
 104     if ( evType == wxEVT_SCROLLWIN_TOP ||
 105          evType == wxEVT_SCROLLWIN_BOTTOM ||
 106          evType == wxEVT_SCROLLWIN_LINEUP ||
 107          evType == wxEVT_SCROLLWIN_LINEDOWN ||
 108          evType == wxEVT_SCROLLWIN_PAGEUP ||
 109          evType == wxEVT_SCROLLWIN_PAGEDOWN ||
 110          evType == wxEVT_SCROLLWIN_THUMBTRACK ||
 111          evType == wxEVT_SCROLLWIN_THUMBRELEASE )
 112     {
 113         m_scrollHelper->HandleOnScroll((wxScrollWinEvent &)event);
 114         if ( !event.GetSkipped() )
 115         {
 116             // it makes sense to indicate that we processed the message as we
 117             // did scroll the window (and also notice that wxAutoScrollTimer
 118             // relies on our return value for continuous scrolling)
 119             processed = true;
 120             wasSkipped = false;
 121         }
 122     }
 123 #if wxUSE_MOUSEWHEEL
 124     else if ( evType == wxEVT_MOUSEWHEEL )
 125     {
 126         m_scrollHelper->HandleOnMouseWheel((wxMouseEvent &)event);
 127     }
 128 #endif // wxUSE_MOUSEWHEEL
 129
 130     if ( processed )
 131         event.Skip(wasSkipped);
 132
 133     return processed;
 134 }
 135
 136
 137 // ============================================================================
 138 // wxVarScrollHelperBase implementation
 139 // ============================================================================
 140
 141 // ----------------------------------------------------------------------------
 142 // wxVarScrollHelperBase initialization
 143 // ----------------------------------------------------------------------------
 144
 145 wxVarScrollHelperBase::wxVarScrollHelperBase(wxWindow *win)
 146 {
 147     wxASSERT_MSG( win, _T("associated window can't be NULL in wxVarScrollHelperBase") );
 148
 149 #if wxUSE_MOUSEWHEEL
 150     m_sumWheelRotation = 0;
 151 #endif
 152
 153     m_unitMax = 0;
 154     m_sizeTotal = 0;
 155     m_unitFirst = 0;
 156
 157     m_win =
 158     m_targetWindow = (wxWindow *)NULL;
 159
 160     m_handler = NULL;
 161
 162     m_win = win;
 163
 164     // by default, the associated window is also the target window
 165     DoSetTargetWindow(win);
 166
 167 }
 168
 169 wxVarScrollHelperBase::~wxVarScrollHelperBase()
 170 {
 171     DeleteEvtHandler();
 172 }
 173
 174 // ----------------------------------------------------------------------------
 175 // wxVarScrollHelperBase various helpers
 176 // ----------------------------------------------------------------------------
 177
 178 void
 179 wxVarScrollHelperBase::AssignOrient(wxCoord& x,
 180                                     wxCoord& y,
 181                                     wxCoord first,
 182                                     wxCoord second)
 183 {
 184     if ( GetOrientation() == wxVERTICAL )
 185     {
 186         x = first;
 187         y = second;
 188     }
 189     else // horizontal
 190     {
 191         x = second;
 192         y = first;
 193     }
 194 }
 195
 196 void
 197 wxVarScrollHelperBase::IncOrient(wxCoord& x, wxCoord& y, wxCoord inc)
 198 {
 199     if ( GetOrientation() == wxVERTICAL )
 200         y += inc;
 201     else
 202         x += inc;
 203 }
 204
 205 wxCoord wxVarScrollHelperBase::DoEstimateTotalSize() const
 206 {
 207     // estimate the total height: it is impossible to call
 208     // OnGetUnitSize() for every unit because there may be too many of
 209     // them, so we just make a guess using some units in the beginning,
 210     // some in the end and some in the middle
 211     static const size_t NUM_UNITS_TO_SAMPLE = 10;
 212
 213     wxCoord sizeTotal;
 214     if ( m_unitMax < 3*NUM_UNITS_TO_SAMPLE )
 215     {
 216         // in this case, full calculations are faster and more correct than
 217         // guessing
 218         sizeTotal = GetUnitsSize(0, m_unitMax);
 219     }
 220     else // too many units to calculate exactly
 221     {
 222         // look at some units in the beginning/middle/end
 223         sizeTotal =
 224             GetUnitsSize(0, NUM_UNITS_TO_SAMPLE) +
 225                 GetUnitsSize(m_unitMax - NUM_UNITS_TO_SAMPLE,
 226                              m_unitMax) +
 227                     GetUnitsSize(m_unitMax/2 - NUM_UNITS_TO_SAMPLE/2,
 228                                  m_unitMax/2 + NUM_UNITS_TO_SAMPLE/2);
 229
 230         // use the height of the units we looked as the average
 231         sizeTotal = (wxCoord)
 232                 (((float)sizeTotal / (3*NUM_UNITS_TO_SAMPLE)) * m_unitMax);
 233     }
 234
 235     return sizeTotal;
 236 }
 237
 238 wxCoord wxVarScrollHelperBase::GetUnitsSize(size_t unitMin, size_t unitMax) const
 239 {
 240     if ( unitMin == unitMax )
 241         return 0;
 242     else if ( unitMin > unitMax )
 243         return -GetUnitsSize(unitMax, unitMin);
 244     //else: unitMin < unitMax
 245
 246     // let the user code know that we're going to need all these units
 247     OnGetUnitsSizeHint(unitMin, unitMax);
 248
 249     // sum up their sizes
 250     wxCoord size = 0;
 251     for ( size_t unit = unitMin; unit < unitMax; ++unit )
 252     {
 253         size += OnGetUnitSize(unit);
 254     }
 255
 256     return size;
 257 }
 258
 259 size_t wxVarScrollHelperBase::FindFirstVisibleFromLast(size_t unitLast, bool full) const
 260 {
 261     const wxCoord sWindow = GetOrientationTargetSize();
 262
 263     // go upwards until we arrive at a unit such that unitLast is not visible
 264     // any more when it is shown
 265     size_t unitFirst = unitLast;
 266     wxCoord s = 0;
 267     for ( ;; )
 268     {
 269         s += OnGetUnitSize(unitFirst);
 270
 271         if ( s > sWindow )
 272         {
 273             // for this unit to be fully visible we need to go one unit
 274             // down, but if it is enough for it to be only partly visible then
 275             // this unit will do as well
 276             if ( full )
 277             {
 278                 ++unitFirst;
 279             }
 280
 281             break;
 282         }
 283
 284         if ( !unitFirst )
 285             break;
 286
 287         --unitFirst;
 288     }
 289
 290     return unitFirst;
 291 }
 292
 293 size_t wxVarScrollHelperBase::GetNewScrollPosition(wxScrollWinEvent& event) const
 294 {
 295     wxEventType evtType = event.GetEventType();
 296
 297     if ( evtType == wxEVT_SCROLLWIN_TOP )
 298     {
 299         return 0;
 300     }
 301     else if ( evtType == wxEVT_SCROLLWIN_BOTTOM )
 302     {
 303         return m_unitMax;
 304     }
 305     else if ( evtType == wxEVT_SCROLLWIN_LINEUP )
 306     {
 307         return m_unitFirst ? m_unitFirst - 1 : 0;
 308     }
 309     else if ( evtType == wxEVT_SCROLLWIN_LINEDOWN )
 310     {
 311         return m_unitFirst + 1;
 312     }
 313     else if ( evtType == wxEVT_SCROLLWIN_PAGEUP )
 314     {
 315         return FindFirstVisibleFromLast(m_unitFirst);
 316     }
 317     else if ( evtType == wxEVT_SCROLLWIN_PAGEDOWN )
 318     {
 319         if ( GetVisibleEnd() )
 320             return GetVisibleEnd() - 1;
 321         else
 322             return GetVisibleEnd();
 323     }
 324     else if ( evtType == wxEVT_SCROLLWIN_THUMBRELEASE )
 325     {
 326         return event.GetPosition();
 327     }
 328     else if ( evtType == wxEVT_SCROLLWIN_THUMBTRACK )
 329     {
 330         return event.GetPosition();
 331     }
 332
 333     // unknown scroll event?
 334     wxFAIL_MSG( _T("unknown scroll event type?") );
 335     return 0;
 336 }
 337
 338 void wxVarScrollHelperBase::UpdateScrollbar()
 339 {
 340     // if there is nothing to scroll, remove the scrollbar
 341     if ( !m_unitMax )
 342     {
 343         RemoveScrollbar();
 344         return;
 345     }
 346
 347     // see how many units can we fit on screen
 348     const wxCoord sWindow = GetOrientationTargetSize();
 349
 350     // do vertical calculations
 351     wxCoord s = 0;
 352     size_t unit;
 353     for ( unit = m_unitFirst; unit < m_unitMax; ++unit )
 354     {
 355         if ( s > sWindow )
 356             break;
 357
 358         s += OnGetUnitSize(unit);
 359     }
 360
 361     m_nUnitsVisible = unit - m_unitFirst;
 362
 363     int unitsPageSize = m_nUnitsVisible;
 364     if ( s > sWindow )
 365     {
 366         // last unit is only partially visible, we still need the scrollbar and
 367         // so we have to "fix" pageSize because if it is equal to m_unitMax
 368         // the scrollbar is not shown at all under MSW
 369         --unitsPageSize;
 370     }
 371
 372     // set the scrollbar parameters to reflect this
 373     m_win->SetScrollbar(GetOrientation(), m_unitFirst, unitsPageSize, m_unitMax);
 374 }
 375
 376 void wxVarScrollHelperBase::RemoveScrollbar()
 377 {
 378     m_unitFirst = 0;
 379     m_nUnitsVisible = m_unitMax;
 380     m_win->SetScrollbar(GetOrientation(), 0, 0, 0);
 381 }
 382
 383 void wxVarScrollHelperBase::DeleteEvtHandler()
 384 {
 385     // search for m_handler in the handler list
 386     if ( m_win && m_handler )
 387     {
 388         if ( m_win->RemoveEventHandler(m_handler) )
 389         {
 390             delete m_handler;
 391         }
 392         //else: something is very wrong, so better [maybe] leak memory than
 393         //      risk a crash because of double deletion
 394
 395         m_handler = NULL;
 396     }
 397 }
 398
 399 void wxVarScrollHelperBase::DoSetTargetWindow(wxWindow *target)
 400 {
 401     m_targetWindow = target;
 402 #ifdef __WXMAC__
 403     target->MacSetClipChildren( true ) ;
 404 #endif
 405
 406     // install the event handler which will intercept the events we're
 407     // interested in (but only do it for our real window, not the target window
 408     // which we scroll - we don't need to hijack its events)
 409     if ( m_targetWindow == m_win )
 410     {
 411         // if we already have a handler, delete it first
 412         DeleteEvtHandler();
 413
 414         m_handler = new wxVarScrollHelperEvtHandler(this);
 415         m_targetWindow->PushEventHandler(m_handler);
 416     }
 417 }
 418
 419 // ----------------------------------------------------------------------------
 420 // wxVarScrollHelperBase operations
 421 // ----------------------------------------------------------------------------
 422
 423 void wxVarScrollHelperBase::SetTargetWindow(wxWindow *target)
 424 {
 425     wxCHECK_RET( target, wxT("target window must not be NULL") );
 426
 427     if ( target == m_targetWindow )
 428         return;
 429
 430     DoSetTargetWindow(target);
 431 }
 432
 433 void wxVarScrollHelperBase::SetUnitCount(size_t count)
 434 {
 435     // save the number of units
 436     m_unitMax = count;
 437
 438     // and our estimate for their total height
 439     m_sizeTotal = EstimateTotalSize();
 440
 441     // ScrollToUnit() will update the scrollbar itself if it changes the unit
 442     // we pass to it because it's out of [new] range
 443     size_t oldScrollPos = m_unitFirst;
 444     DoScrollToUnit(m_unitFirst);
 445     if ( oldScrollPos == m_unitFirst )
 446     {
 447         // but if it didn't do it, we still need to update the scrollbar to
 448         // reflect the changed number of units ourselves
 449         UpdateScrollbar();
 450     }
 451 }
 452
 453 void wxVarScrollHelperBase::RefreshUnit(size_t unit)
 454 {
 455     // is this unit visible?
 456     if ( !IsVisible(unit) )
 457     {
 458         // no, it is useless to do anything
 459         return;
 460     }
 461
 462     // calculate the rect occupied by this unit on screen
 463     wxRect rect;
 464     AssignOrient(rect.width, rect.height,
 465                  GetNonOrientationTargetSize(), OnGetUnitSize(unit));
 466
 467     for ( size_t n = GetVisibleBegin(); n < unit; ++n )
 468     {
 469         IncOrient(rect.x, rect.y, OnGetUnitSize(n));
 470     }
 471
 472     // do refresh it
 473     m_targetWindow->RefreshRect(rect);
 474 }
 475
 476 void wxVarScrollHelperBase::RefreshUnits(size_t from, size_t to)
 477 {
 478     wxASSERT_MSG( from <= to, _T("RefreshUnits(): empty range") );
 479
 480     // clump the range to just the visible units -- it is useless to refresh
 481     // the other ones
 482     if ( from < GetVisibleBegin() )
 483         from = GetVisibleBegin();
 484
 485     if ( to > GetVisibleEnd() )
 486         to = GetVisibleEnd();
 487
 488     // calculate the rect occupied by these units on screen
 489     int orient_size, nonorient_size, orient_pos;
 490     orient_size = nonorient_size = orient_pos = 0;
 491
 492     nonorient_size = GetNonOrientationTargetSize();
 493
 494     for ( size_t nBefore = GetVisibleBegin();
 495           nBefore < from;
 496           nBefore++ )
 497     {
 498         orient_pos += OnGetUnitSize(nBefore);
 499     }
 500
 501     for ( size_t nBetween = from; nBetween <= to; nBetween++ )
 502     {
 503         orient_size += OnGetUnitSize(nBetween);
 504     }
 505
 506     wxRect rect;
 507     AssignOrient(rect.x, rect.y, 0, orient_pos);
 508     AssignOrient(rect.width, rect.height, nonorient_size, orient_size);
 509
 510     // do refresh it
 511     m_targetWindow->RefreshRect(rect);
 512 }
 513
 514 void wxVarScrollHelperBase::RefreshAll()
 515 {
 516     UpdateScrollbar();
 517
 518     m_targetWindow->Refresh();
 519 }
 520
 521 bool wxVarScrollHelperBase::ScrollLayout()
 522 {
 523     if ( m_targetWindow->GetSizer() && m_physicalScrolling )
 524     {
 525         // adjust the sizer dimensions/position taking into account the
 526         // virtual size and scrolled position of the window.
 527
 528         int x, y;
 529         AssignOrient(x, y, 0, -GetScrollOffset());
 530
 531         int w, h;
 532         m_targetWindow->GetVirtualSize(&w, &h);
 533
 534         m_targetWindow->GetSizer()->SetDimension(x, y, w, h);
 535         return true;
 536     }
 537
 538     // fall back to default for LayoutConstraints
 539     return m_targetWindow->wxWindow::Layout();
 540 }
 541
 542 int wxVarScrollHelperBase::VirtualHitTest(wxCoord coord) const
 543 {
 544     const size_t unitMax = GetVisibleEnd();
 545     for ( size_t unit = GetVisibleBegin(); unit < unitMax; ++unit )
 546     {
 547         coord -= OnGetUnitSize(unit);
 548         if ( coord < 0 )
 549             return unit;
 550     }
 551
 552     return wxNOT_FOUND;
 553 }
 554
 555 // ----------------------------------------------------------------------------
 556 // wxVarScrollHelperBase scrolling
 557 // ----------------------------------------------------------------------------
 558
 559 bool wxVarScrollHelperBase::DoScrollToUnit(size_t unit)
 560 {
 561     if ( !m_unitMax )
 562     {
 563         // we're empty, code below doesn't make sense in this case
 564         return false;
 565     }
 566
 567     // determine the real first unit to scroll to: we shouldn't scroll beyond
 568     // the end
 569     size_t unitFirstLast = FindFirstVisibleFromLast(m_unitMax - 1, true);
 570     if ( unit > unitFirstLast )
 571         unit = unitFirstLast;
 572
 573     // anything to do?
 574     if ( unit == m_unitFirst )
 575     {
 576         // no
 577         return false;
 578     }
 579
 580
 581     // remember the currently shown units for the refresh code below
 582     size_t unitFirstOld = GetVisibleBegin(),
 583            unitLastOld = GetVisibleEnd();
 584
 585     m_unitFirst = unit;
 586
 587
 588     // the size of scrollbar thumb could have changed
 589     UpdateScrollbar();
 590
 591     // finally refresh the display -- but only redraw as few units as possible
 592     // to avoid flicker.  We can't do this if we have children because they
 593     // won't be scrolled
 594     if ( m_targetWindow->GetChildren().empty() &&
 595          GetVisibleBegin() >= unitLastOld || GetVisibleEnd() <= unitFirstOld )
 596     {
 597         // the simplest case: we don't have any old units left, just redraw
 598         // everything
 599         m_targetWindow->Refresh();
 600     }
 601     else // scroll the window
 602     {
 603         if ( m_physicalScrolling )
 604         {
 605             wxCoord dx = 0,
 606                     dy = GetUnitsSize(GetVisibleBegin(), unitFirstOld);
 607
 608             if ( GetOrientation() == wxHORIZONTAL )
 609             {
 610                 wxCoord tmp = dx;
 611                 dx = dy;
 612                 dy = tmp;
 613             }
 614
 615             m_targetWindow->ScrollWindow(dx, dy);
 616         }
 617         else // !m_physicalScrolling
 618         {
 619             // we still need to invalidate but we can't use ScrollWindow
 620             // because physical scrolling is disabled (the user either didn't
 621             // want children scrolled and/or doesn't want pixels to be
 622             // physically scrolled).
 623             m_targetWindow->Refresh();
 624         }
 625     }
 626
 627     return true;
 628 }
 629
 630 bool wxVarScrollHelperBase::DoScrollUnits(int units)
 631 {
 632     units += m_unitFirst;
 633     if ( units < 0 )
 634         units = 0;
 635
 636     return DoScrollToUnit(units);
 637 }
 638
 639 bool wxVarScrollHelperBase::DoScrollPages(int pages)
 640 {
 641     bool didSomething = false;
 642
 643     while ( pages )
 644     {
 645         int unit;
 646         if ( pages > 0 )
 647         {
 648             unit = GetVisibleEnd();
 649             if ( unit )
 650                 --unit;
 651             --pages;
 652         }
 653         else // pages < 0
 654         {
 655             unit = FindFirstVisibleFromLast(GetVisibleEnd());
 656             ++pages;
 657         }
 658
 659         didSomething = DoScrollToUnit(unit);
 660     }
 661
 662     return didSomething;
 663 }
 664
 665 // ----------------------------------------------------------------------------
 666 // event handling
 667 // ----------------------------------------------------------------------------
 668
 669 void wxVarScrollHelperBase::HandleOnSize(wxSizeEvent& event)
 670 {
 671     UpdateScrollbar();
 672
 673     event.Skip();
 674 }
 675
 676 void wxVarScrollHelperBase::HandleOnScroll(wxScrollWinEvent& event)
 677 {
 678     if (GetOrientation() != event.GetOrientation())
 679     {
 680         event.Skip();
 681         return;
 682     }
 683
 684     DoScrollToUnit(GetNewScrollPosition(event));
 685
 686 #ifdef __WXMAC__
 687     UpdateMacScrollWindow();
 688 #endif // __WXMAC__
 689 }
 690
 691 void wxVarScrollHelperBase::DoPrepareDC(wxDC& dc)
 692 {
 693     if ( m_physicalScrolling )
 694     {
 695         wxPoint pt = dc.GetDeviceOrigin();
 696
 697         IncOrient(pt.x, pt.y, -GetScrollOffset());
 698
 699         dc.SetDeviceOrigin(pt.x, pt.y);
 700     }
 701 }
 702
 703 int wxVarScrollHelperBase::DoCalcScrolledPosition(int coord) const
 704 {
 705     return coord - GetScrollOffset();
 706 }
 707
 708 int wxVarScrollHelperBase::DoCalcUnscrolledPosition(int coord) const
 709 {
 710     return coord + GetScrollOffset();
 711 }
 712
 713 #if wxUSE_MOUSEWHEEL
 714
 715 void wxVarScrollHelperBase::HandleOnMouseWheel(wxMouseEvent& event)
 716 {
 717     // we only want to process wheel events for vertical implementations.
 718     // There is no way to determine wheel orientation (and on MSW horizontal
 719     // wheel rotation just fakes scroll events, rather than sending a MOUSEWHEEL
 720     // event).
 721     if ( GetOrientation() != wxVERTICAL )
 722         return;
 723
 724     m_sumWheelRotation += event.GetWheelRotation();
 725     int delta = event.GetWheelDelta();
 726
 727     // how much to scroll this time
 728     int units_to_scroll = -(m_sumWheelRotation/delta);
 729     if ( !units_to_scroll )
 730         return;
 731
 732     m_sumWheelRotation += units_to_scroll*delta;
 733
 734     if ( !event.IsPageScroll() )
 735         DoScrollUnits( units_to_scroll*event.GetLinesPerAction() );
 736     else // scroll pages instead of units
 737         DoScrollPages( units_to_scroll );
 738 }
 739
 740 #endif // wxUSE_MOUSEWHEEL
 741
 742
 743 // ============================================================================
 744 // wxVarHVScrollHelper implementation
 745 // ============================================================================
 746
 747 // ----------------------------------------------------------------------------
 748 // wxVarHVScrollHelper operations
 749 // ----------------------------------------------------------------------------
 750
 751 void wxVarHVScrollHelper::SetRowColumnCount(size_t rowCount, size_t columnCount)
 752 {
 753     SetRowCount(rowCount);
 754     SetColumnCount(columnCount);
 755 }
 756
 757 bool wxVarHVScrollHelper::ScrollToRowColumn(size_t row, size_t column)
 758 {
 759     bool result = false;
 760     result |= ScrollToRow(row);
 761     result |= ScrollToColumn(column);
 762     return result;
 763 }
 764
 765 void wxVarHVScrollHelper::RefreshRowColumn(size_t row, size_t column)
 766 {
 767     // is this unit visible?
 768     if ( !IsRowVisible(row) || !IsColumnVisible(column) )
 769     {
 770         // no, it is useless to do anything
 771         return;
 772     }
 773
 774     // calculate the rect occupied by this cell on screen
 775     wxRect v_rect, h_rect;
 776     v_rect.height = OnGetRowHeight(row);
 777     h_rect.width = OnGetColumnWidth(column);
 778
 779     size_t n;
 780
 781     for ( n = GetVisibleRowsBegin(); n < row; n++ )
 782     {
 783         v_rect.y += OnGetRowHeight(n);
 784     }
 785
 786     for ( n = GetVisibleColumnsBegin(); n < column; n++ )
 787     {
 788         h_rect.x += OnGetColumnWidth(n);
 789     }
 790
 791     // refresh but specialize the behavior if we have a single target window
 792     if ( wxVarVScrollHelper::GetTargetWindow() == wxVarHScrollHelper::GetTargetWindow() )
 793     {
 794         v_rect.x = h_rect.x;
 795         v_rect.width = h_rect.width;
 796         wxVarVScrollHelper::GetTargetWindow()->RefreshRect(v_rect);
 797     }
 798     else
 799     {
 800         v_rect.x = 0;
 801         v_rect.width = wxVarVScrollHelper::GetNonOrientationTargetSize();
 802         h_rect.y = 0;
 803         h_rect.width = wxVarHScrollHelper::GetNonOrientationTargetSize();
 804
 805         wxVarVScrollHelper::GetTargetWindow()->RefreshRect(v_rect);
 806         wxVarHScrollHelper::GetTargetWindow()->RefreshRect(h_rect);
 807     }
 808 }
 809
 810 void wxVarHVScrollHelper::RefreshRowsColumns(size_t fromRow, size_t toRow,
 811                                              size_t fromColumn, size_t toColumn)
 812 {
 813     wxASSERT_MSG( fromRow <= toRow || fromColumn <= toColumn,
 814         _T("RefreshRowsColumns(): empty range") );
 815
 816     // clump the range to just the visible units -- it is useless to refresh
 817     // the other ones
 818     if ( fromRow < GetVisibleRowsBegin() )
 819         fromRow = GetVisibleRowsBegin();
 820
 821     if ( toRow > GetVisibleRowsEnd() )
 822         toRow = GetVisibleRowsEnd();
 823
 824     if ( fromColumn < GetVisibleColumnsBegin() )
 825         fromColumn = GetVisibleColumnsBegin();
 826
 827     if ( toColumn > GetVisibleColumnsEnd() )
 828         toColumn = GetVisibleColumnsEnd();
 829
 830     // calculate the rect occupied by these units on screen
 831     wxRect v_rect, h_rect;
 832     size_t nBefore, nBetween;
 833
 834     for ( nBefore = GetVisibleRowsBegin();
 835           nBefore < fromRow;
 836           nBefore++ )
 837     {
 838         v_rect.y += OnGetRowHeight(nBefore);
 839     }
 840
 841     for ( nBetween = fromRow; nBetween <= toRow; nBetween++ )
 842     {
 843         v_rect.height += OnGetRowHeight(nBetween);
 844     }
 845
 846     for ( nBefore = GetVisibleColumnsBegin();
 847           nBefore < fromColumn;
 848           nBefore++ )
 849     {
 850         h_rect.x += OnGetColumnWidth(nBefore);
 851     }
 852
 853     for ( nBetween = fromColumn; nBetween <= toColumn; nBetween++ )
 854     {
 855         h_rect.width += OnGetColumnWidth(nBetween);
 856     }
 857
 858     // refresh but specialize the behavior if we have a single target window
 859     if ( wxVarVScrollHelper::GetTargetWindow() == wxVarHScrollHelper::GetTargetWindow() )
 860     {
 861         v_rect.x = h_rect.x;
 862         v_rect.width = h_rect.width;
 863         wxVarVScrollHelper::GetTargetWindow()->RefreshRect(v_rect);
 864     }
 865     else
 866     {
 867         v_rect.x = 0;
 868         v_rect.width = wxVarVScrollHelper::GetNonOrientationTargetSize();
 869         h_rect.y = 0;
 870         h_rect.width = wxVarHScrollHelper::GetNonOrientationTargetSize();
 871
 872         wxVarVScrollHelper::GetTargetWindow()->RefreshRect(v_rect);
 873         wxVarHScrollHelper::GetTargetWindow()->RefreshRect(h_rect);
 874     }
 875 }
 876
 877 wxPosition wxVarHVScrollHelper::VirtualHitTest(wxCoord x, wxCoord y) const
 878 {
 879     return wxPosition(wxVarVScrollHelper::VirtualHitTest(y),
 880                       wxVarHScrollHelper::VirtualHitTest(x));
 881 }
 882
 883 void wxVarHVScrollHelper::DoPrepareDC(wxDC& dc)
 884 {
 885     wxVarVScrollHelper::DoPrepareDC(dc);
 886     wxVarHScrollHelper::DoPrepareDC(dc);
 887 }
 888
 889 bool wxVarHVScrollHelper::ScrollLayout()
 890 {
 891     bool layout_result = false;
 892     layout_result |= wxVarVScrollHelper::ScrollLayout();
 893     layout_result |= wxVarHScrollHelper::ScrollLayout();
 894     return layout_result;
 895 }
 896
 897 wxSize wxVarHVScrollHelper::GetRowColumnCount() const
 898 {
 899     return wxSize(GetColumnCount(), GetRowCount());
 900 }
 901
 902 wxPosition wxVarHVScrollHelper::GetVisibleBegin() const
 903 {
 904     return wxPosition(GetVisibleRowsBegin(), GetVisibleColumnsBegin());
 905 }
 906
 907 wxPosition wxVarHVScrollHelper::GetVisibleEnd() const
 908 {
 909     return wxPosition(GetVisibleRowsEnd(), GetVisibleColumnsEnd());
 910 }
 911
 912 bool wxVarHVScrollHelper::IsVisible(size_t row, size_t column) const
 913 {
 914     return IsRowVisible(row) && IsColumnVisible(column);
 915 }
 916
 917
 918 // ============================================================================
 919 // wx[V/H/HV]ScrolledWindow implementations
 920 // ============================================================================
 921
 922 IMPLEMENT_ABSTRACT_CLASS(wxVScrolledWindow, wxPanel)
 923 IMPLEMENT_ABSTRACT_CLASS(wxHScrolledWindow, wxPanel)
 924 IMPLEMENT_ABSTRACT_CLASS(wxHVScrolledWindow, wxPanel)
 925
 926
 927 #if WXWIN_COMPATIBILITY_2_8
 928
 929 // ===========================================================================
 930 // wxVarVScrollLegacyAdaptor
 931 // ===========================================================================
 932
 933 size_t wxVarVScrollLegacyAdaptor::GetFirstVisibleLine() const
 934 { return GetVisibleRowsBegin(); }
 935
 936 size_t wxVarVScrollLegacyAdaptor::GetLastVisibleLine() const
 937 { return GetVisibleRowsEnd() - 1; }
 938
 939 size_t wxVarVScrollLegacyAdaptor::GetLineCount() const
 940 { return GetRowCount(); }
 941
 942 void wxVarVScrollLegacyAdaptor::SetLineCount(size_t count)
 943 { SetRowCount(count); }
 944
 945 void wxVarVScrollLegacyAdaptor::RefreshLine(size_t line)
 946 { RefreshRow(line); }
 947
 948 void wxVarVScrollLegacyAdaptor::RefreshLines(size_t from, size_t to)
 949 { RefreshRows(from, to); }
 950
 951 bool wxVarVScrollLegacyAdaptor::ScrollToLine(size_t line)
 952 { return ScrollToRow(line); }
 953
 954 bool wxVarVScrollLegacyAdaptor::ScrollLines(int lines)
 955 { return ScrollRows(lines); }
 956
 957 bool wxVarVScrollLegacyAdaptor::ScrollPages(int pages)
 958 { return ScrollRowPages(pages); }
 959
 960 wxCoord wxVarVScrollLegacyAdaptor::OnGetLineHeight(size_t WXUNUSED(n)) const
 961 {
 962     wxFAIL_MSG( _T("OnGetLineHeight() must be overridden if OnGetRowHeight() isn't!") );
 963     return -1;
 964 }
 965
 966 void wxVarVScrollLegacyAdaptor::OnGetLinesHint( size_t WXUNUSED(lineMin), size_t WXUNUSED(lineMax)) const
 967 { }
 968
 969 #endif