src/generic/scrlwing.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        generic/scrolwin.cpp
   3 // Purpose:     wxGenericScrolledWindow implementation
   4 // Author:      Julian Smart
   5 // Modified by: Vadim Zeitlin on 31.08.00: wxScrollHelper allows to implement
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) wxWindows team
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21     #pragma implementation "genscrolwin.h"
  22 #endif
  23
  24 #ifdef __VMS
  25 #define XtDisplay XTDISPLAY
  26 #endif
  27
  28 // For compilers that support precompilation, includes "wx.h".
  29 #include "wx/wxprec.h"
  30
  31 #ifdef __BORLANDC__
  32     #pragma hdrstop
  33 #endif
  34
  35 #if !defined(__WXGTK__) || defined(__WXUNIVERSAL__)
  36
  37 #include "wx/utils.h"
  38 #include "wx/dcclient.h"
  39
  40 #include "wx/scrolwin.h"
  41 #include "wx/panel.h"
  42 #include "wx/timer.h"
  43
  44 #ifdef __WXMSW__
  45     #include <windows.h> // for DLGC_WANTARROWS
  46 #endif
  47
  48 #ifdef __WXMOTIF__
  49 // For wxRETAINED implementation
  50 #ifdef __VMS__ //VMS's Xm.h is not (yet) compatible with C++
  51                //This code switches off the compiler warnings
  52 # pragma message disable nosimpint
  53 #endif
  54 #include <Xm/Xm.h>
  55 #ifdef __VMS__
  56 # pragma message enable nosimpint
  57 #endif
  58 #endif
  59
  60 IMPLEMENT_CLASS(wxScrolledWindow, wxGenericScrolledWindow)
  61
  62 // ----------------------------------------------------------------------------
  63 // wxScrollHelperEvtHandler: intercept the events from the window and forward
  64 // them to wxScrollHelper
  65 // ----------------------------------------------------------------------------
  66
  67 class WXDLLEXPORT wxScrollHelperEvtHandler : public wxEvtHandler
  68 {
  69 public:
  70     wxScrollHelperEvtHandler(wxScrollHelper *scrollHelper)
  71     {
  72         m_scrollHelper = scrollHelper;
  73     }
  74
  75     virtual bool ProcessEvent(wxEvent& event);
  76
  77     void ResetDrawnFlag() { m_hasDrawnWindow = FALSE; }
  78
  79 private:
  80     wxScrollHelper *m_scrollHelper;
  81
  82     bool m_hasDrawnWindow;
  83 };
  84
  85 // ----------------------------------------------------------------------------
  86 // wxAutoScrollTimer: the timer used to generate a stream of scroll events when
  87 // a captured mouse is held outside the window
  88 // ----------------------------------------------------------------------------
  89
  90 class wxAutoScrollTimer : public wxTimer
  91 {
  92 public:
  93     wxAutoScrollTimer(wxWindow *winToScroll, wxScrollHelper *scroll,
  94                       wxEventType eventTypeToSend,
  95                       int pos, int orient);
  96
  97     virtual void Notify();
  98
  99 private:
 100     wxWindow *m_win;
 101     wxScrollHelper *m_scrollHelper;
 102     wxEventType m_eventType;
 103     int m_pos,
 104         m_orient;
 105 };
 106
 107 // ============================================================================
 108 // implementation
 109 // ============================================================================
 110
 111 // ----------------------------------------------------------------------------
 112 // wxAutoScrollTimer
 113 // ----------------------------------------------------------------------------
 114
 115 wxAutoScrollTimer::wxAutoScrollTimer(wxWindow *winToScroll,
 116                                      wxScrollHelper *scroll,
 117                                      wxEventType eventTypeToSend,
 118                                      int pos, int orient)
 119 {
 120     m_win = winToScroll;
 121     m_scrollHelper = scroll;
 122     m_eventType = eventTypeToSend;
 123     m_pos = pos;
 124     m_orient = orient;
 125 }
 126
 127 void wxAutoScrollTimer::Notify()
 128 {
 129     // only do all this as long as the window is capturing the mouse
 130     if ( wxWindow::GetCapture() != m_win )
 131     {
 132         Stop();
 133     }
 134     else // we still capture the mouse, continue generating events
 135     {
 136         // first scroll the window if we are allowed to do it
 137         wxScrollWinEvent event1(m_eventType, m_pos, m_orient);
 138         event1.SetEventObject(m_win);
 139         if ( m_scrollHelper->SendAutoScrollEvents(event1) &&
 140                 m_win->GetEventHandler()->ProcessEvent(event1) )
 141         {
 142             // and then send a pseudo mouse-move event to refresh the selection
 143             wxMouseEvent event2(wxEVT_MOTION);
 144             wxGetMousePosition(&event2.m_x, &event2.m_y);
 145
 146             // the mouse event coordinates should be client, not screen as
 147             // returned by wxGetMousePosition
 148             wxWindow *parentTop = m_win;
 149             while ( parentTop->GetParent() )
 150                 parentTop = parentTop->GetParent();
 151             wxPoint ptOrig = parentTop->GetPosition();
 152             event2.m_x -= ptOrig.x;
 153             event2.m_y -= ptOrig.y;
 154
 155             event2.SetEventObject(m_win);
 156
 157             // FIXME: we don't fill in the other members - ok?
 158
 159             m_win->GetEventHandler()->ProcessEvent(event2);
 160         }
 161         else // can't scroll further, stop
 162         {
 163             Stop();
 164         }
 165     }
 166 }
 167
 168 // ----------------------------------------------------------------------------
 169 // wxScrollHelperEvtHandler
 170 // ----------------------------------------------------------------------------
 171
 172 bool wxScrollHelperEvtHandler::ProcessEvent(wxEvent& event)
 173 {
 174     wxEventType evType = event.GetEventType();
 175
 176     // the explanation of wxEVT_PAINT processing hack: for historic reasons
 177     // there are 2 ways to process this event in classes deriving from
 178     // wxScrolledWindow. The user code may
 179     //
 180     //  1. override wxScrolledWindow::OnDraw(dc)
 181     //  2. define its own OnPaint() handler
 182     //
 183     // In addition, in wxUniversal wxWindow defines OnPaint() itself and
 184     // always processes the draw event, so we can't just try the window
 185     // OnPaint() first and call our HandleOnPaint() if it doesn't process it
 186     // (the latter would never be called in wxUniversal).
 187     //
 188     // So the solution is to have a flag telling us whether the user code drew
 189     // anything in the window. We set it to true here but reset it to false in
 190     // wxScrolledWindow::OnPaint() handler (which wouldn't be called if the
 191     // user code defined OnPaint() in the derived class)
 192     m_hasDrawnWindow = TRUE;
 193
 194     // pass it on to the real handler
 195     bool processed = wxEvtHandler::ProcessEvent(event);
 196
 197     // always process the size events ourselves, even if the user code handles
 198     // them as well, as we need to AdjustScrollbars()
 199     //
 200     // NB: it is important to do it after processing the event in the normal
 201     //     way as HandleOnSize() may generate a wxEVT_SIZE itself if the
 202     //     scrollbar[s] (dis)appear and it should be seen by the user code
 203     //     after this one
 204     if ( evType == wxEVT_SIZE )
 205     {
 206         m_scrollHelper->HandleOnSize((wxSizeEvent &)event);
 207
 208         return TRUE;
 209     }
 210
 211     if ( processed )
 212     {
 213         // normally, nothing more to do here - except if it was a paint event
 214         // which wasn't really processed, then we'll try to call our
 215         // OnDraw() below (from HandleOnPaint)
 216         if ( m_hasDrawnWindow )
 217         {
 218             return TRUE;
 219         }
 220     }
 221
 222     // reset the skipped flag to FALSE as it might have been set to TRUE in
 223     // ProcessEvent() above
 224     event.Skip(FALSE);
 225
 226     if ( evType == wxEVT_PAINT )
 227     {
 228         m_scrollHelper->HandleOnPaint((wxPaintEvent &)event);
 229         return TRUE;
 230     }
 231
 232     if ( evType == wxEVT_SCROLLWIN_TOP ||
 233          evType == wxEVT_SCROLLWIN_BOTTOM ||
 234          evType == wxEVT_SCROLLWIN_LINEUP ||
 235          evType == wxEVT_SCROLLWIN_LINEDOWN ||
 236          evType == wxEVT_SCROLLWIN_PAGEUP ||
 237          evType == wxEVT_SCROLLWIN_PAGEDOWN ||
 238          evType == wxEVT_SCROLLWIN_THUMBTRACK ||
 239          evType == wxEVT_SCROLLWIN_THUMBRELEASE )
 240     {
 241             m_scrollHelper->HandleOnScroll((wxScrollWinEvent &)event);
 242             return !event.GetSkipped();
 243     }
 244
 245     if ( evType == wxEVT_ENTER_WINDOW )
 246     {
 247         m_scrollHelper->HandleOnMouseEnter((wxMouseEvent &)event);
 248     }
 249     else if ( evType == wxEVT_LEAVE_WINDOW )
 250     {
 251         m_scrollHelper->HandleOnMouseLeave((wxMouseEvent &)event);
 252     }
 253 #if wxUSE_MOUSEWHEEL
 254     else if ( evType == wxEVT_MOUSEWHEEL )
 255     {
 256         m_scrollHelper->HandleOnMouseWheel((wxMouseEvent &)event);
 257     }
 258 #endif // wxUSE_MOUSEWHEEL
 259     else if ( evType == wxEVT_CHAR )
 260     {
 261         m_scrollHelper->HandleOnChar((wxKeyEvent &)event);
 262         return !event.GetSkipped();
 263     }
 264
 265     return FALSE;
 266 }
 267
 268 // ----------------------------------------------------------------------------
 269 // wxScrollHelper construction
 270 // ----------------------------------------------------------------------------
 271
 272 wxScrollHelper::wxScrollHelper(wxWindow *win)
 273 {
 274     m_xScrollPixelsPerLine =
 275     m_yScrollPixelsPerLine =
 276     m_xScrollPosition =
 277     m_yScrollPosition =
 278     m_xScrollLines =
 279     m_yScrollLines =
 280     m_xScrollLinesPerPage =
 281     m_yScrollLinesPerPage = 0;
 282
 283     m_xScrollingEnabled =
 284     m_yScrollingEnabled = TRUE;
 285
 286     m_scaleX =
 287     m_scaleY = 1.0;
 288 #if wxUSE_MOUSEWHEEL
 289     m_wheelRotation = 0;
 290 #endif
 291
 292     m_win =
 293     m_targetWindow = (wxWindow *)NULL;
 294
 295     m_timerAutoScroll = (wxTimer *)NULL;
 296
 297     m_handler = NULL;
 298
 299     if ( win )
 300         SetWindow(win);
 301 }
 302
 303 wxScrollHelper::~wxScrollHelper()
 304 {
 305     StopAutoScrolling();
 306
 307     DeleteEvtHandler();
 308 }
 309
 310 // ----------------------------------------------------------------------------
 311 // setting scrolling parameters
 312 // ----------------------------------------------------------------------------
 313
 314 void wxScrollHelper::SetScrollbars(int pixelsPerUnitX,
 315                                    int pixelsPerUnitY,
 316                                    int noUnitsX,
 317                                    int noUnitsY,
 318                                    int xPos,
 319                                    int yPos,
 320                                    bool noRefresh)
 321 {
 322     int xpos, ypos;
 323
 324     CalcUnscrolledPosition(xPos, yPos, &xpos, &ypos);
 325     bool do_refresh =
 326     (
 327       (noUnitsX != 0 && m_xScrollLines == 0) ||
 328       (noUnitsX < m_xScrollLines && xpos > pixelsPerUnitX*noUnitsX) ||
 329
 330       (noUnitsY != 0 && m_yScrollLines == 0) ||
 331       (noUnitsY < m_yScrollLines && ypos > pixelsPerUnitY*noUnitsY) ||
 332       (xPos != m_xScrollPosition) ||
 333       (yPos != m_yScrollPosition)
 334     );
 335
 336     m_xScrollPixelsPerLine = pixelsPerUnitX;
 337     m_yScrollPixelsPerLine = pixelsPerUnitY;
 338     m_xScrollPosition = xPos;
 339     m_yScrollPosition = yPos;
 340     m_xScrollLines = noUnitsX;
 341     m_yScrollLines = noUnitsY;
 342
 343 #ifdef __WXMOTIF__
 344     // Sorry, some Motif-specific code to implement a backing pixmap
 345     // for the wxRETAINED style. Implementing a backing store can't
 346     // be entirely generic because it relies on the wxWindowDC implementation
 347     // to duplicate X drawing calls for the backing pixmap.
 348
 349     if ( m_targetWindow->GetWindowStyle() & wxRETAINED )
 350     {
 351         Display* dpy = XtDisplay((Widget)m_targetWindow->GetMainWidget());
 352
 353         int totalPixelWidth = m_xScrollLines * m_xScrollPixelsPerLine;
 354         int totalPixelHeight = m_yScrollLines * m_yScrollPixelsPerLine;
 355         if (m_targetWindow->GetBackingPixmap() &&
 356            !((m_targetWindow->GetPixmapWidth() == totalPixelWidth) &&
 357              (m_targetWindow->GetPixmapHeight() == totalPixelHeight)))
 358         {
 359             XFreePixmap (dpy, (Pixmap) m_targetWindow->GetBackingPixmap());
 360             m_targetWindow->SetBackingPixmap((WXPixmap) 0);
 361         }
 362
 363         if (!m_targetWindow->GetBackingPixmap() &&
 364            (noUnitsX != 0) && (noUnitsY != 0))
 365         {
 366             int depth = wxDisplayDepth();
 367             m_targetWindow->SetPixmapWidth(totalPixelWidth);
 368             m_targetWindow->SetPixmapHeight(totalPixelHeight);
 369             m_targetWindow->SetBackingPixmap((WXPixmap) XCreatePixmap (dpy, RootWindow (dpy, DefaultScreen (dpy)),
 370               m_targetWindow->GetPixmapWidth(), m_targetWindow->GetPixmapHeight(), depth));
 371         }
 372
 373     }
 374 #endif // Motif
 375
 376     AdjustScrollbars();
 377
 378     if (do_refresh && !noRefresh)
 379         m_targetWindow->Refresh(TRUE, GetRect());
 380
 381 #ifdef __WXMAC__
 382     m_targetWindow->MacUpdateImmediately() ;
 383 #endif
 384 }
 385
 386 // ----------------------------------------------------------------------------
 387 // [target] window handling
 388 // ----------------------------------------------------------------------------
 389
 390 void wxScrollHelper::DeleteEvtHandler()
 391 {
 392     // FIXME: we should search for m_handler in the handler list
 393     if ( m_win )
 394     {
 395         m_win->PopEventHandler(TRUE /* Delete old event handler*/);
 396     }
 397 }
 398
 399 void wxScrollHelper::SetWindow(wxWindow *win)
 400 {
 401     wxCHECK_RET( win, _T("wxScrollHelper needs a window to scroll") );
 402
 403     m_win = win;
 404
 405     // by default, the associated window is also the target window
 406     DoSetTargetWindow(win);
 407 }
 408
 409 void wxScrollHelper::DoSetTargetWindow(wxWindow *target)
 410 {
 411     m_targetWindow = target;
 412
 413     // install the event handler which will intercept the events we're
 414     // interested in (but only do it for our real window, not the target window
 415     // which we scroll - we don't need to hijack its events)
 416     if ( m_targetWindow == m_win )
 417     {
 418         m_handler = new wxScrollHelperEvtHandler(this);
 419         m_targetWindow->PushEventHandler(m_handler);
 420     }
 421 }
 422
 423 void wxScrollHelper::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 wxWindow *wxScrollHelper::GetTargetWindow() const
 434 {
 435     return m_targetWindow;
 436 }
 437
 438 // ----------------------------------------------------------------------------
 439 // scrolling implementation itself
 440 // ----------------------------------------------------------------------------
 441
 442 void wxScrollHelper::HandleOnScroll(wxScrollWinEvent& event)
 443 {
 444     int nScrollInc = CalcScrollInc(event);
 445     if ( nScrollInc == 0 )
 446     {
 447         // can't scroll further
 448         event.Skip();
 449
 450         return;
 451     }
 452
 453     int orient = event.GetOrientation();
 454     if (orient == wxHORIZONTAL)
 455     {
 456         m_xScrollPosition += nScrollInc;
 457         m_win->SetScrollPos(wxHORIZONTAL, m_xScrollPosition);
 458     }
 459     else
 460     {
 461         m_yScrollPosition += nScrollInc;
 462         m_win->SetScrollPos(wxVERTICAL, m_yScrollPosition);
 463     }
 464
 465     bool needsRefresh = FALSE;
 466     int dx = 0,
 467         dy = 0;
 468     if (orient == wxHORIZONTAL)
 469     {
 470        if ( m_xScrollingEnabled )
 471        {
 472            dx = -m_xScrollPixelsPerLine * nScrollInc;
 473        }
 474        else
 475        {
 476            needsRefresh = TRUE;
 477        }
 478     }
 479     else
 480     {
 481         if ( m_yScrollingEnabled )
 482         {
 483             dy = -m_yScrollPixelsPerLine * nScrollInc;
 484         }
 485         else
 486         {
 487             needsRefresh = TRUE;
 488         }
 489     }
 490
 491     if ( needsRefresh )
 492     {
 493         m_targetWindow->Refresh(TRUE, GetRect());
 494     }
 495     else
 496     {
 497         m_targetWindow->ScrollWindow(dx, dy, GetRect());
 498     }
 499
 500 #ifdef __WXMAC__
 501     m_targetWindow->MacUpdateImmediately() ;
 502 #endif
 503 }
 504
 505 int wxScrollHelper::CalcScrollInc(wxScrollWinEvent& event)
 506 {
 507     int pos = event.GetPosition();
 508     int orient = event.GetOrientation();
 509
 510     int nScrollInc = 0;
 511     if (event.GetEventType() == wxEVT_SCROLLWIN_TOP)
 512     {
 513             if (orient == wxHORIZONTAL)
 514                 nScrollInc = - m_xScrollPosition;
 515             else
 516                 nScrollInc = - m_yScrollPosition;
 517     } else
 518     if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
 519     {
 520             if (orient == wxHORIZONTAL)
 521                 nScrollInc = m_xScrollLines - m_xScrollPosition;
 522             else
 523                 nScrollInc = m_yScrollLines - m_yScrollPosition;
 524     } else
 525     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
 526     {
 527             nScrollInc = -1;
 528     } else
 529     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN)
 530     {
 531             nScrollInc = 1;
 532     } else
 533     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEUP)
 534     {
 535             if (orient == wxHORIZONTAL)
 536                 nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
 537             else
 538                 nScrollInc = -GetScrollPageSize(wxVERTICAL);
 539     } else
 540     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEDOWN)
 541     {
 542             if (orient == wxHORIZONTAL)
 543                 nScrollInc = GetScrollPageSize(wxHORIZONTAL);
 544             else
 545                 nScrollInc = GetScrollPageSize(wxVERTICAL);
 546     } else
 547     if ((event.GetEventType() == wxEVT_SCROLLWIN_THUMBTRACK) ||
 548         (event.GetEventType() == wxEVT_SCROLLWIN_THUMBRELEASE))
 549     {
 550             if (orient == wxHORIZONTAL)
 551                 nScrollInc = pos - m_xScrollPosition;
 552             else
 553                 nScrollInc = pos - m_yScrollPosition;
 554     }
 555
 556     if (orient == wxHORIZONTAL)
 557     {
 558         if (m_xScrollPixelsPerLine > 0)
 559         {
 560             int w, h;
 561             GetTargetSize(&w, &h);
 562
 563             int nMaxWidth = m_xScrollLines*m_xScrollPixelsPerLine;
 564             int noPositions = (int) ( ((nMaxWidth - w)/(double)m_xScrollPixelsPerLine) + 0.5 );
 565             if (noPositions < 0)
 566                 noPositions = 0;
 567
 568             if ( (m_xScrollPosition + nScrollInc) < 0 )
 569                 nScrollInc = -m_xScrollPosition; // As -ve as we can go
 570             else if ( (m_xScrollPosition + nScrollInc) > noPositions )
 571                 nScrollInc = noPositions - m_xScrollPosition; // As +ve as we can go
 572         }
 573         else
 574             m_targetWindow->Refresh(TRUE, GetRect());
 575     }
 576     else
 577     {
 578         if (m_yScrollPixelsPerLine > 0)
 579         {
 580             int w, h;
 581             GetTargetSize(&w, &h);
 582
 583             int nMaxHeight = m_yScrollLines*m_yScrollPixelsPerLine;
 584             int noPositions = (int) ( ((nMaxHeight - h)/(double)m_yScrollPixelsPerLine) + 0.5 );
 585             if (noPositions < 0)
 586                 noPositions = 0;
 587
 588             if ( (m_yScrollPosition + nScrollInc) < 0 )
 589                 nScrollInc = -m_yScrollPosition; // As -ve as we can go
 590             else if ( (m_yScrollPosition + nScrollInc) > noPositions )
 591                 nScrollInc = noPositions - m_yScrollPosition; // As +ve as we can go
 592         }
 593         else
 594             m_targetWindow->Refresh(TRUE, GetRect());
 595     }
 596
 597     return nScrollInc;
 598 }
 599
 600 // Adjust the scrollbars - new version.
 601 void wxScrollHelper::AdjustScrollbars()
 602 {
 603 #ifdef __WXMAC__
 604     m_targetWindow->MacUpdateImmediately();
 605 #endif
 606
 607     int w, h;
 608     GetTargetSize(&w, &h);
 609
 610     int oldXScroll = m_xScrollPosition;
 611     int oldYScroll = m_yScrollPosition;
 612
 613     if (m_xScrollLines > 0)
 614     {
 615         // Calculate page size i.e. number of scroll units you get on the
 616         // current client window
 617         int noPagePositions = (int) ( (w/(double)m_xScrollPixelsPerLine) + 0.5 );
 618         if (noPagePositions < 1) noPagePositions = 1;
 619         if ( noPagePositions > m_xScrollLines )
 620             noPagePositions = m_xScrollLines;
 621
 622         // Correct position if greater than extent of canvas minus
 623         // the visible portion of it or if below zero
 624         m_xScrollPosition = wxMin( m_xScrollLines-noPagePositions, m_xScrollPosition);
 625         m_xScrollPosition = wxMax( 0, m_xScrollPosition );
 626
 627         m_win->SetScrollbar(wxHORIZONTAL, m_xScrollPosition, noPagePositions, m_xScrollLines);
 628         // The amount by which we scroll when paging
 629         SetScrollPageSize(wxHORIZONTAL, noPagePositions);
 630     }
 631     else
 632     {
 633         m_xScrollPosition = 0;
 634         m_win->SetScrollbar (wxHORIZONTAL, 0, 0, 0, FALSE);
 635     }
 636
 637     if (m_yScrollLines > 0)
 638     {
 639         // Calculate page size i.e. number of scroll units you get on the
 640         // current client window
 641         int noPagePositions = (int) ( (h/(double)m_yScrollPixelsPerLine) + 0.5 );
 642         if (noPagePositions < 1) noPagePositions = 1;
 643         if ( noPagePositions > m_yScrollLines )
 644             noPagePositions = m_yScrollLines;
 645
 646         // Correct position if greater than extent of canvas minus
 647         // the visible portion of it or if below zero
 648         m_yScrollPosition = wxMin( m_yScrollLines-noPagePositions, m_yScrollPosition );
 649         m_yScrollPosition = wxMax( 0, m_yScrollPosition );
 650
 651         m_win->SetScrollbar(wxVERTICAL, m_yScrollPosition, noPagePositions, m_yScrollLines);
 652         // The amount by which we scroll when paging
 653         SetScrollPageSize(wxVERTICAL, noPagePositions);
 654     }
 655     else
 656     {
 657         m_yScrollPosition = 0;
 658         m_win->SetScrollbar (wxVERTICAL, 0, 0, 0, FALSE);
 659     }
 660
 661     if (oldXScroll != m_xScrollPosition)
 662     {
 663        if (m_xScrollingEnabled)
 664             m_targetWindow->ScrollWindow( m_xScrollPixelsPerLine * (oldXScroll-m_xScrollPosition), 0,
 665                                           GetRect() );
 666        else
 667             m_targetWindow->Refresh(TRUE, GetRect());
 668     }
 669
 670     if (oldYScroll != m_yScrollPosition)
 671     {
 672         if (m_yScrollingEnabled)
 673             m_targetWindow->ScrollWindow( 0, m_yScrollPixelsPerLine * (oldYScroll-m_yScrollPosition),
 674                                           GetRect() );
 675         else
 676             m_targetWindow->Refresh(TRUE, GetRect());
 677     }
 678
 679 #ifdef __WXMAC__
 680     m_targetWindow->MacUpdateImmediately();
 681 #endif
 682 }
 683
 684 void wxScrollHelper::DoPrepareDC(wxDC& dc)
 685 {
 686     wxPoint pt = dc.GetDeviceOrigin();
 687     dc.SetDeviceOrigin( pt.x - m_xScrollPosition * m_xScrollPixelsPerLine,
 688                         pt.y - m_yScrollPosition * m_yScrollPixelsPerLine );
 689     dc.SetUserScale( m_scaleX, m_scaleY );
 690 }
 691
 692 void wxScrollHelper::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 693 {
 694     if ( x_unit )
 695         *x_unit = m_xScrollPixelsPerLine;
 696     if ( y_unit )
 697         *y_unit = m_yScrollPixelsPerLine;
 698 }
 699
 700 int wxScrollHelper::GetScrollPageSize(int orient) const
 701 {
 702     if ( orient == wxHORIZONTAL )
 703         return m_xScrollLinesPerPage;
 704     else
 705         return m_yScrollLinesPerPage;
 706 }
 707
 708 void wxScrollHelper::SetScrollPageSize(int orient, int pageSize)
 709 {
 710     if ( orient == wxHORIZONTAL )
 711         m_xScrollLinesPerPage = pageSize;
 712     else
 713         m_yScrollLinesPerPage = pageSize;
 714 }
 715
 716 /*
 717  * Scroll to given position (scroll position, not pixel position)
 718  */
 719 void wxScrollHelper::Scroll( int x_pos, int y_pos )
 720 {
 721     if (!m_targetWindow)
 722         return;
 723
 724     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
 725         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
 726
 727 #ifdef __WXMAC__
 728     m_targetWindow->MacUpdateImmediately();
 729 #endif
 730
 731     int w, h;
 732     GetTargetSize(&w, &h);
 733
 734     if ((x_pos != -1) && (m_xScrollPixelsPerLine))
 735     {
 736         int old_x = m_xScrollPosition;
 737         m_xScrollPosition = x_pos;
 738
 739         // Calculate page size i.e. number of scroll units you get on the
 740         // current client window
 741         int noPagePositions = (int) ( (w/(double)m_xScrollPixelsPerLine) + 0.5 );
 742         if (noPagePositions < 1) noPagePositions = 1;
 743
 744         // Correct position if greater than extent of canvas minus
 745         // the visible portion of it or if below zero
 746         m_xScrollPosition = wxMin( m_xScrollLines-noPagePositions, m_xScrollPosition );
 747         m_xScrollPosition = wxMax( 0, m_xScrollPosition );
 748
 749         if (old_x != m_xScrollPosition) {
 750             m_win->SetScrollPos( wxHORIZONTAL, m_xScrollPosition );
 751             m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0,
 752                                           GetRect() );
 753         }
 754     }
 755     if ((y_pos != -1) && (m_yScrollPixelsPerLine))
 756     {
 757         int old_y = m_yScrollPosition;
 758         m_yScrollPosition = y_pos;
 759
 760         // Calculate page size i.e. number of scroll units you get on the
 761         // current client window
 762         int noPagePositions = (int) ( (h/(double)m_yScrollPixelsPerLine) + 0.5 );
 763         if (noPagePositions < 1) noPagePositions = 1;
 764
 765         // Correct position if greater than extent of canvas minus
 766         // the visible portion of it or if below zero
 767         m_yScrollPosition = wxMin( m_yScrollLines-noPagePositions, m_yScrollPosition );
 768         m_yScrollPosition = wxMax( 0, m_yScrollPosition );
 769
 770         if (old_y != m_yScrollPosition) {
 771             m_win->SetScrollPos( wxVERTICAL, m_yScrollPosition );
 772             m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine,
 773                                           GetRect() );
 774         }
 775     }
 776
 777 #ifdef __WXMAC__
 778     m_targetWindow->MacUpdateImmediately();
 779 #endif
 780
 781 }
 782
 783 void wxScrollHelper::EnableScrolling (bool x_scroll, bool y_scroll)
 784 {
 785     m_xScrollingEnabled = x_scroll;
 786     m_yScrollingEnabled = y_scroll;
 787 }
 788
 789 void wxScrollHelper::GetVirtualSize (int *x, int *y) const
 790 {
 791     if ( x )
 792         *x = m_xScrollPixelsPerLine * m_xScrollLines;
 793     if ( y )
 794         *y = m_yScrollPixelsPerLine * m_yScrollLines;
 795 }
 796
 797 // Where the current view starts from
 798 void wxScrollHelper::GetViewStart (int *x, int *y) const
 799 {
 800     if ( x )
 801         *x = m_xScrollPosition;
 802     if ( y )
 803         *y = m_yScrollPosition;
 804 }
 805
 806 void wxScrollHelper::CalcScrolledPosition(int x, int y, int *xx, int *yy) const
 807 {
 808     if ( xx )
 809         *xx = x - m_xScrollPosition * m_xScrollPixelsPerLine;
 810     if ( yy )
 811         *yy = y - m_yScrollPosition * m_yScrollPixelsPerLine;
 812 }
 813
 814 void wxScrollHelper::CalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
 815 {
 816     if ( xx )
 817         *xx = x + m_xScrollPosition * m_xScrollPixelsPerLine;
 818     if ( yy )
 819         *yy = y + m_yScrollPosition * m_yScrollPixelsPerLine;
 820 }
 821
 822 // ----------------------------------------------------------------------------
 823 // event handlers
 824 // ----------------------------------------------------------------------------
 825
 826 // Default OnSize resets scrollbars, if any
 827 void wxScrollHelper::HandleOnSize(wxSizeEvent& WXUNUSED(event))
 828 {
 829 #if wxUSE_CONSTRAINTS
 830     if ( m_win->GetAutoLayout() )
 831         m_win->Layout();
 832 #endif
 833
 834     AdjustScrollbars();
 835 }
 836
 837 // This calls OnDraw, having adjusted the origin according to the current
 838 // scroll position
 839 void wxScrollHelper::HandleOnPaint(wxPaintEvent& WXUNUSED(event))
 840 {
 841     // don't use m_targetWindow here, this is always called for ourselves
 842     wxPaintDC dc(m_win);
 843     DoPrepareDC(dc);
 844
 845     OnDraw(dc);
 846 }
 847
 848 // kbd handling: notice that we use OnChar() and not OnKeyDown() for
 849 // compatibility here - if we used OnKeyDown(), the programs which process
 850 // arrows themselves in their OnChar() would never get the message and like
 851 // this they always have the priority
 852 void wxScrollHelper::HandleOnChar(wxKeyEvent& event)
 853 {
 854     int stx, sty,       // view origin
 855         szx, szy,       // view size (total)
 856         clix, cliy;     // view size (on screen)
 857
 858     GetViewStart(&stx, &sty);
 859     GetTargetSize(&clix, &cliy);
 860     GetVirtualSize(&szx, &szy);
 861
 862     if( m_xScrollPixelsPerLine )
 863     {
 864         clix /= m_xScrollPixelsPerLine;
 865         szx /= m_xScrollPixelsPerLine;
 866     }
 867     else
 868     {
 869         clix = 0;
 870         szx = -1;
 871     }
 872     if( m_yScrollPixelsPerLine )
 873     {
 874         cliy /= m_yScrollPixelsPerLine;
 875         szy /= m_yScrollPixelsPerLine;
 876     }
 877     else
 878     {
 879         cliy = 0;
 880         szy = -1;
 881     }
 882
 883     int xScrollOld = m_xScrollPosition,
 884         yScrollOld = m_yScrollPosition;
 885
 886     int dsty;
 887     switch ( event.KeyCode() )
 888     {
 889         case WXK_PAGEUP:
 890         case WXK_PRIOR:
 891             dsty = sty - (5 * cliy / 6);
 892             Scroll(-1, (dsty == -1) ? 0 : dsty);
 893             break;
 894
 895         case WXK_PAGEDOWN:
 896         case WXK_NEXT:
 897             Scroll(-1, sty + (5 * cliy / 6));
 898             break;
 899
 900         case WXK_HOME:
 901             Scroll(0, event.ControlDown() ? 0 : -1);
 902             break;
 903
 904         case WXK_END:
 905             Scroll(szx - clix, event.ControlDown() ? szy - cliy : -1);
 906             break;
 907
 908         case WXK_UP:
 909             Scroll(-1, sty - 1);
 910             break;
 911
 912         case WXK_DOWN:
 913             Scroll(-1, sty + 1);
 914             break;
 915
 916         case WXK_LEFT:
 917             Scroll(stx - 1, -1);
 918             break;
 919
 920         case WXK_RIGHT:
 921             Scroll(stx + 1, -1);
 922             break;
 923
 924         default:
 925             // not for us
 926             event.Skip();
 927     }
 928
 929     if ( m_xScrollPosition != xScrollOld )
 930     {
 931         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, m_xScrollPosition,
 932                                wxHORIZONTAL);
 933         event.SetEventObject(m_win);
 934         m_win->GetEventHandler()->ProcessEvent(event);
 935     }
 936
 937     if ( m_yScrollPosition != yScrollOld )
 938     {
 939         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, m_yScrollPosition,
 940                                wxVERTICAL);
 941         event.SetEventObject(m_win);
 942         m_win->GetEventHandler()->ProcessEvent(event);
 943     }
 944 }
 945
 946 // ----------------------------------------------------------------------------
 947 // autoscroll stuff: these functions deal with sending fake scroll events when
 948 // a captured mouse is being held outside the window
 949 // ----------------------------------------------------------------------------
 950
 951 bool wxScrollHelper::SendAutoScrollEvents(wxScrollWinEvent& event) const
 952 {
 953     // only send the event if the window is scrollable in this direction
 954     wxWindow *win = (wxWindow *)event.GetEventObject();
 955     return win->HasScrollbar(event.GetOrientation());
 956 }
 957
 958 void wxScrollHelper::StopAutoScrolling()
 959 {
 960     if ( m_timerAutoScroll )
 961     {
 962         delete m_timerAutoScroll;
 963         m_timerAutoScroll = (wxTimer *)NULL;
 964     }
 965 }
 966
 967 void wxScrollHelper::HandleOnMouseEnter(wxMouseEvent& event)
 968 {
 969     StopAutoScrolling();
 970
 971     event.Skip();
 972 }
 973
 974 void wxScrollHelper::HandleOnMouseLeave(wxMouseEvent& event)
 975 {
 976     // don't prevent the usual processing of the event from taking place
 977     event.Skip();
 978
 979     // when a captured mouse leave a scrolled window we start generate
 980     // scrolling events to allow, for example, extending selection beyond the
 981     // visible area in some controls
 982     if ( wxWindow::GetCapture() == m_targetWindow )
 983     {
 984         // where is the mouse leaving?
 985         int pos, orient;
 986         wxPoint pt = event.GetPosition();
 987         if ( pt.x < 0 )
 988         {
 989             orient = wxHORIZONTAL;
 990             pos = 0;
 991         }
 992         else if ( pt.y < 0 )
 993         {
 994             orient = wxVERTICAL;
 995             pos = 0;
 996         }
 997         else // we're lower or to the right of the window
 998         {
 999             wxSize size = m_targetWindow->GetClientSize();
1000             if ( pt.x > size.x )
1001             {
1002                 orient = wxHORIZONTAL;
1003                 pos = m_xScrollLines;
1004             }
1005             else if ( pt.y > size.y )
1006             {
1007                 orient = wxVERTICAL;
1008                 pos = m_yScrollLines;
1009             }
1010             else // this should be impossible
1011             {
1012                 // but seems to happen sometimes under wxMSW - maybe it's a bug
1013                 // there but for now just ignore it
1014
1015                 //wxFAIL_MSG( _T("can't understand where has mouse gone") );
1016
1017                 return;
1018             }
1019         }
1020
1021         // only start the auto scroll timer if the window can be scrolled in
1022         // this direction
1023         if ( !m_targetWindow->HasScrollbar(orient) )
1024             return;
1025
1026         delete m_timerAutoScroll;
1027         m_timerAutoScroll = new wxAutoScrollTimer
1028                                 (
1029                                     m_targetWindow, this,
1030                                     pos == 0 ? wxEVT_SCROLLWIN_LINEUP
1031                                              : wxEVT_SCROLLWIN_LINEDOWN,
1032                                     pos,
1033                                     orient
1034                                 );
1035         m_timerAutoScroll->Start(50); // FIXME: make configurable
1036     }
1037 }
1038
1039 #if wxUSE_MOUSEWHEEL
1040
1041 void wxScrollHelper::HandleOnMouseWheel(wxMouseEvent& event)
1042 {
1043     m_wheelRotation += event.GetWheelRotation();
1044     int lines = m_wheelRotation / event.GetWheelDelta();
1045     m_wheelRotation -= lines * event.GetWheelDelta();
1046
1047     if (lines != 0)
1048     {
1049         lines *= event.GetLinesPerAction();
1050
1051         wxScrollWinEvent newEvent;
1052
1053         newEvent.SetPosition(0);
1054         newEvent.SetOrientation(wxVERTICAL);
1055         newEvent.m_eventObject = m_win;
1056         if (lines > 0)
1057             newEvent.m_eventType = wxEVT_SCROLLWIN_LINEUP;
1058         else
1059             newEvent.m_eventType = wxEVT_SCROLLWIN_LINEDOWN;
1060
1061         int times = abs(lines);
1062         for (; times > 0; times --)
1063             m_win->GetEventHandler()->ProcessEvent(newEvent);
1064
1065         /* Old Way */
1066         // int vsx, vsy;
1067         // GetViewStart(&vsx, &vsy);
1068         // Scroll(-1, vsy - lines);
1069     }
1070 }
1071
1072 #endif // wxUSE_MOUSEWHEEL
1073
1074 // ----------------------------------------------------------------------------
1075 // wxGenericScrolledWindow implementation
1076 // ----------------------------------------------------------------------------
1077
1078 IMPLEMENT_DYNAMIC_CLASS(wxGenericScrolledWindow, wxPanel)
1079
1080 BEGIN_EVENT_TABLE(wxGenericScrolledWindow, wxPanel)
1081     EVT_PAINT(wxGenericScrolledWindow::OnPaint)
1082 END_EVENT_TABLE()
1083
1084 bool wxGenericScrolledWindow::Create(wxWindow *parent,
1085                               wxWindowID id,
1086                               const wxPoint& pos,
1087                               const wxSize& size,
1088                               long style,
1089                               const wxString& name)
1090 {
1091     m_targetWindow = this;
1092
1093     bool ok = wxPanel::Create(parent, id, pos, size, style, name);
1094
1095 #ifdef __WXMSW__
1096     // we need to process arrows ourselves for scrolling
1097     m_lDlgCode |= DLGC_WANTARROWS;
1098 #endif // __WXMSW__
1099
1100     return ok;
1101 }
1102
1103 wxGenericScrolledWindow::~wxGenericScrolledWindow()
1104 {
1105 }
1106
1107 void wxGenericScrolledWindow::OnPaint(wxPaintEvent& event)
1108 {
1109     // the user code didn't really draw the window if we got here, so set this
1110     // flag to try to call OnDraw() later
1111     m_handler->ResetDrawnFlag();
1112
1113     event.Skip();
1114 }
1115
1116 #if WXWIN_COMPATIBILITY
1117
1118 void wxGenericScrolledWindow::GetScrollUnitsPerPage (int *x_page, int *y_page) const
1119 {
1120       *x_page = GetScrollPageSize(wxHORIZONTAL);
1121       *y_page = GetScrollPageSize(wxVERTICAL);
1122 }
1123
1124 void wxGenericScrolledWindow::CalcUnscrolledPosition(int x, int y, float *xx, float *yy) const
1125 {
1126     if ( xx )
1127         *xx = (float)(x + m_xScrollPosition * m_xScrollPixelsPerLine);
1128     if ( yy )
1129         *yy = (float)(y + m_yScrollPosition * m_yScrollPixelsPerLine);
1130 }
1131
1132 #endif // WXWIN_COMPATIBILITY
1133
1134 #endif // !wxGTK
1135