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     // search for m_handler in the handler list
 393     if ( m_win && m_handler )
 394     {
 395         if ( m_win->RemoveEventHandler(m_handler) )
 396         {
 397             delete m_handler;
 398         }
 399         //else: something is very wrong, so better [maybe] leak memory than
 400         //      risk a crash because of double deletion
 401
 402         m_handler = NULL;
 403     }
 404 }
 405
 406 void wxScrollHelper::SetWindow(wxWindow *win)
 407 {
 408     wxCHECK_RET( win, _T("wxScrollHelper needs a window to scroll") );
 409
 410     m_win = win;
 411
 412     // by default, the associated window is also the target window
 413     DoSetTargetWindow(win);
 414 }
 415
 416 void wxScrollHelper::DoSetTargetWindow(wxWindow *target)
 417 {
 418     m_targetWindow = target;
 419
 420     // install the event handler which will intercept the events we're
 421     // interested in (but only do it for our real window, not the target window
 422     // which we scroll - we don't need to hijack its events)
 423     if ( m_targetWindow == m_win )
 424     {
 425         // if we already have a handler, delete it first
 426         DeleteEvtHandler();
 427
 428         m_handler = new wxScrollHelperEvtHandler(this);
 429         m_targetWindow->PushEventHandler(m_handler);
 430     }
 431 }
 432
 433 void wxScrollHelper::SetTargetWindow(wxWindow *target)
 434 {
 435     wxCHECK_RET( target, wxT("target window must not be NULL") );
 436
 437     if ( target == m_targetWindow )
 438         return;
 439
 440     DoSetTargetWindow(target);
 441 }
 442
 443 wxWindow *wxScrollHelper::GetTargetWindow() const
 444 {
 445     return m_targetWindow;
 446 }
 447
 448 // ----------------------------------------------------------------------------
 449 // scrolling implementation itself
 450 // ----------------------------------------------------------------------------
 451
 452 void wxScrollHelper::HandleOnScroll(wxScrollWinEvent& event)
 453 {
 454     int nScrollInc = CalcScrollInc(event);
 455     if ( nScrollInc == 0 )
 456     {
 457         // can't scroll further
 458         event.Skip();
 459
 460         return;
 461     }
 462
 463     int orient = event.GetOrientation();
 464     if (orient == wxHORIZONTAL)
 465     {
 466         m_xScrollPosition += nScrollInc;
 467         m_win->SetScrollPos(wxHORIZONTAL, m_xScrollPosition);
 468     }
 469     else
 470     {
 471         m_yScrollPosition += nScrollInc;
 472         m_win->SetScrollPos(wxVERTICAL, m_yScrollPosition);
 473     }
 474
 475     bool needsRefresh = FALSE;
 476     int dx = 0,
 477         dy = 0;
 478     if (orient == wxHORIZONTAL)
 479     {
 480        if ( m_xScrollingEnabled )
 481        {
 482            dx = -m_xScrollPixelsPerLine * nScrollInc;
 483        }
 484        else
 485        {
 486            needsRefresh = TRUE;
 487        }
 488     }
 489     else
 490     {
 491         if ( m_yScrollingEnabled )
 492         {
 493             dy = -m_yScrollPixelsPerLine * nScrollInc;
 494         }
 495         else
 496         {
 497             needsRefresh = TRUE;
 498         }
 499     }
 500
 501     if ( needsRefresh )
 502     {
 503         m_targetWindow->Refresh(TRUE, GetRect());
 504     }
 505     else
 506     {
 507         m_targetWindow->ScrollWindow(dx, dy, GetRect());
 508     }
 509
 510 #ifdef __WXMAC__
 511     m_targetWindow->MacUpdateImmediately() ;
 512 #endif
 513 }
 514
 515 int wxScrollHelper::CalcScrollInc(wxScrollWinEvent& event)
 516 {
 517     int pos = event.GetPosition();
 518     int orient = event.GetOrientation();
 519
 520     int nScrollInc = 0;
 521     if (event.GetEventType() == wxEVT_SCROLLWIN_TOP)
 522     {
 523             if (orient == wxHORIZONTAL)
 524                 nScrollInc = - m_xScrollPosition;
 525             else
 526                 nScrollInc = - m_yScrollPosition;
 527     } else
 528     if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
 529     {
 530             if (orient == wxHORIZONTAL)
 531                 nScrollInc = m_xScrollLines - m_xScrollPosition;
 532             else
 533                 nScrollInc = m_yScrollLines - m_yScrollPosition;
 534     } else
 535     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
 536     {
 537             nScrollInc = -1;
 538     } else
 539     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN)
 540     {
 541             nScrollInc = 1;
 542     } else
 543     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEUP)
 544     {
 545             if (orient == wxHORIZONTAL)
 546                 nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
 547             else
 548                 nScrollInc = -GetScrollPageSize(wxVERTICAL);
 549     } else
 550     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEDOWN)
 551     {
 552             if (orient == wxHORIZONTAL)
 553                 nScrollInc = GetScrollPageSize(wxHORIZONTAL);
 554             else
 555                 nScrollInc = GetScrollPageSize(wxVERTICAL);
 556     } else
 557     if ((event.GetEventType() == wxEVT_SCROLLWIN_THUMBTRACK) ||
 558         (event.GetEventType() == wxEVT_SCROLLWIN_THUMBRELEASE))
 559     {
 560             if (orient == wxHORIZONTAL)
 561                 nScrollInc = pos - m_xScrollPosition;
 562             else
 563                 nScrollInc = pos - m_yScrollPosition;
 564     }
 565
 566     if (orient == wxHORIZONTAL)
 567     {
 568         if (m_xScrollPixelsPerLine > 0)
 569         {
 570             int w, h;
 571             GetTargetSize(&w, &h);
 572
 573             int nMaxWidth = m_xScrollLines*m_xScrollPixelsPerLine;
 574             int noPositions = (int) ( ((nMaxWidth - w)/(double)m_xScrollPixelsPerLine) + 0.5 );
 575             if (noPositions < 0)
 576                 noPositions = 0;
 577
 578             if ( (m_xScrollPosition + nScrollInc) < 0 )
 579                 nScrollInc = -m_xScrollPosition; // As -ve as we can go
 580             else if ( (m_xScrollPosition + nScrollInc) > noPositions )
 581                 nScrollInc = noPositions - m_xScrollPosition; // As +ve as we can go
 582         }
 583         else
 584             m_targetWindow->Refresh(TRUE, GetRect());
 585     }
 586     else
 587     {
 588         if (m_yScrollPixelsPerLine > 0)
 589         {
 590             int w, h;
 591             GetTargetSize(&w, &h);
 592
 593             int nMaxHeight = m_yScrollLines*m_yScrollPixelsPerLine;
 594             int noPositions = (int) ( ((nMaxHeight - h)/(double)m_yScrollPixelsPerLine) + 0.5 );
 595             if (noPositions < 0)
 596                 noPositions = 0;
 597
 598             if ( (m_yScrollPosition + nScrollInc) < 0 )
 599                 nScrollInc = -m_yScrollPosition; // As -ve as we can go
 600             else if ( (m_yScrollPosition + nScrollInc) > noPositions )
 601                 nScrollInc = noPositions - m_yScrollPosition; // As +ve as we can go
 602         }
 603         else
 604             m_targetWindow->Refresh(TRUE, GetRect());
 605     }
 606
 607     return nScrollInc;
 608 }
 609
 610 // Adjust the scrollbars - new version.
 611 void wxScrollHelper::AdjustScrollbars()
 612 {
 613 #ifdef __WXMAC__
 614     m_targetWindow->MacUpdateImmediately();
 615 #endif
 616
 617     int w, h;
 618     GetTargetSize(&w, &h);
 619
 620     int oldXScroll = m_xScrollPosition;
 621     int oldYScroll = m_yScrollPosition;
 622
 623     if (m_xScrollLines > 0)
 624     {
 625         // Calculate page size i.e. number of scroll units you get on the
 626         // current client window
 627         int noPagePositions = (int) ( (w/(double)m_xScrollPixelsPerLine) + 0.5 );
 628         if (noPagePositions < 1) noPagePositions = 1;
 629         if ( noPagePositions > m_xScrollLines )
 630             noPagePositions = m_xScrollLines;
 631
 632         // Correct position if greater than extent of canvas minus
 633         // the visible portion of it or if below zero
 634         m_xScrollPosition = wxMin( m_xScrollLines-noPagePositions, m_xScrollPosition);
 635         m_xScrollPosition = wxMax( 0, m_xScrollPosition );
 636
 637         m_win->SetScrollbar(wxHORIZONTAL, m_xScrollPosition, noPagePositions, m_xScrollLines);
 638         // The amount by which we scroll when paging
 639         SetScrollPageSize(wxHORIZONTAL, noPagePositions);
 640     }
 641     else
 642     {
 643         m_xScrollPosition = 0;
 644         m_win->SetScrollbar (wxHORIZONTAL, 0, 0, 0, FALSE);
 645     }
 646
 647     if (m_yScrollLines > 0)
 648     {
 649         // Calculate page size i.e. number of scroll units you get on the
 650         // current client window
 651         int noPagePositions = (int) ( (h/(double)m_yScrollPixelsPerLine) + 0.5 );
 652         if (noPagePositions < 1) noPagePositions = 1;
 653         if ( noPagePositions > m_yScrollLines )
 654             noPagePositions = m_yScrollLines;
 655
 656         // Correct position if greater than extent of canvas minus
 657         // the visible portion of it or if below zero
 658         m_yScrollPosition = wxMin( m_yScrollLines-noPagePositions, m_yScrollPosition );
 659         m_yScrollPosition = wxMax( 0, m_yScrollPosition );
 660
 661         m_win->SetScrollbar(wxVERTICAL, m_yScrollPosition, noPagePositions, m_yScrollLines);
 662         // The amount by which we scroll when paging
 663         SetScrollPageSize(wxVERTICAL, noPagePositions);
 664     }
 665     else
 666     {
 667         m_yScrollPosition = 0;
 668         m_win->SetScrollbar (wxVERTICAL, 0, 0, 0, FALSE);
 669     }
 670
 671     if (oldXScroll != m_xScrollPosition)
 672     {
 673        if (m_xScrollingEnabled)
 674             m_targetWindow->ScrollWindow( m_xScrollPixelsPerLine * (oldXScroll-m_xScrollPosition), 0,
 675                                           GetRect() );
 676        else
 677             m_targetWindow->Refresh(TRUE, GetRect());
 678     }
 679
 680     if (oldYScroll != m_yScrollPosition)
 681     {
 682         if (m_yScrollingEnabled)
 683             m_targetWindow->ScrollWindow( 0, m_yScrollPixelsPerLine * (oldYScroll-m_yScrollPosition),
 684                                           GetRect() );
 685         else
 686             m_targetWindow->Refresh(TRUE, GetRect());
 687     }
 688
 689 #ifdef __WXMAC__
 690     m_targetWindow->MacUpdateImmediately();
 691 #endif
 692 }
 693
 694 void wxScrollHelper::DoPrepareDC(wxDC& dc)
 695 {
 696     wxPoint pt = dc.GetDeviceOrigin();
 697     dc.SetDeviceOrigin( pt.x - m_xScrollPosition * m_xScrollPixelsPerLine,
 698                         pt.y - m_yScrollPosition * m_yScrollPixelsPerLine );
 699     dc.SetUserScale( m_scaleX, m_scaleY );
 700 }
 701
 702 void wxScrollHelper::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 703 {
 704     if ( x_unit )
 705         *x_unit = m_xScrollPixelsPerLine;
 706     if ( y_unit )
 707         *y_unit = m_yScrollPixelsPerLine;
 708 }
 709
 710 int wxScrollHelper::GetScrollPageSize(int orient) const
 711 {
 712     if ( orient == wxHORIZONTAL )
 713         return m_xScrollLinesPerPage;
 714     else
 715         return m_yScrollLinesPerPage;
 716 }
 717
 718 void wxScrollHelper::SetScrollPageSize(int orient, int pageSize)
 719 {
 720     if ( orient == wxHORIZONTAL )
 721         m_xScrollLinesPerPage = pageSize;
 722     else
 723         m_yScrollLinesPerPage = pageSize;
 724 }
 725
 726 /*
 727  * Scroll to given position (scroll position, not pixel position)
 728  */
 729 void wxScrollHelper::Scroll( int x_pos, int y_pos )
 730 {
 731     if (!m_targetWindow)
 732         return;
 733
 734     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
 735         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
 736
 737 #ifdef __WXMAC__
 738     m_targetWindow->MacUpdateImmediately();
 739 #endif
 740
 741     int w, h;
 742     GetTargetSize(&w, &h);
 743
 744     if ((x_pos != -1) && (m_xScrollPixelsPerLine))
 745     {
 746         int old_x = m_xScrollPosition;
 747         m_xScrollPosition = x_pos;
 748
 749         // Calculate page size i.e. number of scroll units you get on the
 750         // current client window
 751         int noPagePositions = (int) ( (w/(double)m_xScrollPixelsPerLine) + 0.5 );
 752         if (noPagePositions < 1) noPagePositions = 1;
 753
 754         // Correct position if greater than extent of canvas minus
 755         // the visible portion of it or if below zero
 756         m_xScrollPosition = wxMin( m_xScrollLines-noPagePositions, m_xScrollPosition );
 757         m_xScrollPosition = wxMax( 0, m_xScrollPosition );
 758
 759         if (old_x != m_xScrollPosition) {
 760             m_win->SetScrollPos( wxHORIZONTAL, m_xScrollPosition );
 761             m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0,
 762                                           GetRect() );
 763         }
 764     }
 765     if ((y_pos != -1) && (m_yScrollPixelsPerLine))
 766     {
 767         int old_y = m_yScrollPosition;
 768         m_yScrollPosition = y_pos;
 769
 770         // Calculate page size i.e. number of scroll units you get on the
 771         // current client window
 772         int noPagePositions = (int) ( (h/(double)m_yScrollPixelsPerLine) + 0.5 );
 773         if (noPagePositions < 1) noPagePositions = 1;
 774
 775         // Correct position if greater than extent of canvas minus
 776         // the visible portion of it or if below zero
 777         m_yScrollPosition = wxMin( m_yScrollLines-noPagePositions, m_yScrollPosition );
 778         m_yScrollPosition = wxMax( 0, m_yScrollPosition );
 779
 780         if (old_y != m_yScrollPosition) {
 781             m_win->SetScrollPos( wxVERTICAL, m_yScrollPosition );
 782             m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine,
 783                                           GetRect() );
 784         }
 785     }
 786
 787 #ifdef __WXMAC__
 788     m_targetWindow->MacUpdateImmediately();
 789 #endif
 790
 791 }
 792
 793 void wxScrollHelper::EnableScrolling (bool x_scroll, bool y_scroll)
 794 {
 795     m_xScrollingEnabled = x_scroll;
 796     m_yScrollingEnabled = y_scroll;
 797 }
 798
 799 void wxScrollHelper::GetVirtualSize (int *x, int *y) const
 800 {
 801     if ( x )
 802         *x = m_xScrollPixelsPerLine * m_xScrollLines;
 803     if ( y )
 804         *y = m_yScrollPixelsPerLine * m_yScrollLines;
 805 }
 806
 807 // Where the current view starts from
 808 void wxScrollHelper::GetViewStart (int *x, int *y) const
 809 {
 810     if ( x )
 811         *x = m_xScrollPosition;
 812     if ( y )
 813         *y = m_yScrollPosition;
 814 }
 815
 816 void wxScrollHelper::CalcScrolledPosition(int x, int y, int *xx, int *yy) const
 817 {
 818     if ( xx )
 819         *xx = x - m_xScrollPosition * m_xScrollPixelsPerLine;
 820     if ( yy )
 821         *yy = y - m_yScrollPosition * m_yScrollPixelsPerLine;
 822 }
 823
 824 void wxScrollHelper::CalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
 825 {
 826     if ( xx )
 827         *xx = x + m_xScrollPosition * m_xScrollPixelsPerLine;
 828     if ( yy )
 829         *yy = y + m_yScrollPosition * m_yScrollPixelsPerLine;
 830 }
 831
 832 // ----------------------------------------------------------------------------
 833 // event handlers
 834 // ----------------------------------------------------------------------------
 835
 836 // Default OnSize resets scrollbars, if any
 837 void wxScrollHelper::HandleOnSize(wxSizeEvent& WXUNUSED(event))
 838 {
 839 #if wxUSE_CONSTRAINTS
 840     if ( m_win->GetAutoLayout() )
 841         m_win->Layout();
 842 #endif
 843
 844     AdjustScrollbars();
 845 }
 846
 847 // This calls OnDraw, having adjusted the origin according to the current
 848 // scroll position
 849 void wxScrollHelper::HandleOnPaint(wxPaintEvent& WXUNUSED(event))
 850 {
 851     // don't use m_targetWindow here, this is always called for ourselves
 852     wxPaintDC dc(m_win);
 853     DoPrepareDC(dc);
 854
 855     OnDraw(dc);
 856 }
 857
 858 // kbd handling: notice that we use OnChar() and not OnKeyDown() for
 859 // compatibility here - if we used OnKeyDown(), the programs which process
 860 // arrows themselves in their OnChar() would never get the message and like
 861 // this they always have the priority
 862 void wxScrollHelper::HandleOnChar(wxKeyEvent& event)
 863 {
 864     int stx, sty,       // view origin
 865         szx, szy,       // view size (total)
 866         clix, cliy;     // view size (on screen)
 867
 868     GetViewStart(&stx, &sty);
 869     GetTargetSize(&clix, &cliy);
 870     GetVirtualSize(&szx, &szy);
 871
 872     if( m_xScrollPixelsPerLine )
 873     {
 874         clix /= m_xScrollPixelsPerLine;
 875         szx /= m_xScrollPixelsPerLine;
 876     }
 877     else
 878     {
 879         clix = 0;
 880         szx = -1;
 881     }
 882     if( m_yScrollPixelsPerLine )
 883     {
 884         cliy /= m_yScrollPixelsPerLine;
 885         szy /= m_yScrollPixelsPerLine;
 886     }
 887     else
 888     {
 889         cliy = 0;
 890         szy = -1;
 891     }
 892
 893     int xScrollOld = m_xScrollPosition,
 894         yScrollOld = m_yScrollPosition;
 895
 896     int dsty;
 897     switch ( event.KeyCode() )
 898     {
 899         case WXK_PAGEUP:
 900         case WXK_PRIOR:
 901             dsty = sty - (5 * cliy / 6);
 902             Scroll(-1, (dsty == -1) ? 0 : dsty);
 903             break;
 904
 905         case WXK_PAGEDOWN:
 906         case WXK_NEXT:
 907             Scroll(-1, sty + (5 * cliy / 6));
 908             break;
 909
 910         case WXK_HOME:
 911             Scroll(0, event.ControlDown() ? 0 : -1);
 912             break;
 913
 914         case WXK_END:
 915             Scroll(szx - clix, event.ControlDown() ? szy - cliy : -1);
 916             break;
 917
 918         case WXK_UP:
 919             Scroll(-1, sty - 1);
 920             break;
 921
 922         case WXK_DOWN:
 923             Scroll(-1, sty + 1);
 924             break;
 925
 926         case WXK_LEFT:
 927             Scroll(stx - 1, -1);
 928             break;
 929
 930         case WXK_RIGHT:
 931             Scroll(stx + 1, -1);
 932             break;
 933
 934         default:
 935             // not for us
 936             event.Skip();
 937     }
 938
 939     if ( m_xScrollPosition != xScrollOld )
 940     {
 941         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, m_xScrollPosition,
 942                                wxHORIZONTAL);
 943         event.SetEventObject(m_win);
 944         m_win->GetEventHandler()->ProcessEvent(event);
 945     }
 946
 947     if ( m_yScrollPosition != yScrollOld )
 948     {
 949         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, m_yScrollPosition,
 950                                wxVERTICAL);
 951         event.SetEventObject(m_win);
 952         m_win->GetEventHandler()->ProcessEvent(event);
 953     }
 954 }
 955
 956 // ----------------------------------------------------------------------------
 957 // autoscroll stuff: these functions deal with sending fake scroll events when
 958 // a captured mouse is being held outside the window
 959 // ----------------------------------------------------------------------------
 960
 961 bool wxScrollHelper::SendAutoScrollEvents(wxScrollWinEvent& event) const
 962 {
 963     // only send the event if the window is scrollable in this direction
 964     wxWindow *win = (wxWindow *)event.GetEventObject();
 965     return win->HasScrollbar(event.GetOrientation());
 966 }
 967
 968 void wxScrollHelper::StopAutoScrolling()
 969 {
 970     if ( m_timerAutoScroll )
 971     {
 972         delete m_timerAutoScroll;
 973         m_timerAutoScroll = (wxTimer *)NULL;
 974     }
 975 }
 976
 977 void wxScrollHelper::HandleOnMouseEnter(wxMouseEvent& event)
 978 {
 979     StopAutoScrolling();
 980
 981     event.Skip();
 982 }
 983
 984 void wxScrollHelper::HandleOnMouseLeave(wxMouseEvent& event)
 985 {
 986     // don't prevent the usual processing of the event from taking place
 987     event.Skip();
 988
 989     // when a captured mouse leave a scrolled window we start generate
 990     // scrolling events to allow, for example, extending selection beyond the
 991     // visible area in some controls
 992     if ( wxWindow::GetCapture() == m_targetWindow )
 993     {
 994         // where is the mouse leaving?
 995         int pos, orient;
 996         wxPoint pt = event.GetPosition();
 997         if ( pt.x < 0 )
 998         {
 999             orient = wxHORIZONTAL;
1000             pos = 0;
1001         }
1002         else if ( pt.y < 0 )
1003         {
1004             orient = wxVERTICAL;
1005             pos = 0;
1006         }
1007         else // we're lower or to the right of the window
1008         {
1009             wxSize size = m_targetWindow->GetClientSize();
1010             if ( pt.x > size.x )
1011             {
1012                 orient = wxHORIZONTAL;
1013                 pos = m_xScrollLines;
1014             }
1015             else if ( pt.y > size.y )
1016             {
1017                 orient = wxVERTICAL;
1018                 pos = m_yScrollLines;
1019             }
1020             else // this should be impossible
1021             {
1022                 // but seems to happen sometimes under wxMSW - maybe it's a bug
1023                 // there but for now just ignore it
1024
1025                 //wxFAIL_MSG( _T("can't understand where has mouse gone") );
1026
1027                 return;
1028             }
1029         }
1030
1031         // only start the auto scroll timer if the window can be scrolled in
1032         // this direction
1033         if ( !m_targetWindow->HasScrollbar(orient) )
1034             return;
1035
1036         delete m_timerAutoScroll;
1037         m_timerAutoScroll = new wxAutoScrollTimer
1038                                 (
1039                                     m_targetWindow, this,
1040                                     pos == 0 ? wxEVT_SCROLLWIN_LINEUP
1041                                              : wxEVT_SCROLLWIN_LINEDOWN,
1042                                     pos,
1043                                     orient
1044                                 );
1045         m_timerAutoScroll->Start(50); // FIXME: make configurable
1046     }
1047 }
1048
1049 #if wxUSE_MOUSEWHEEL
1050
1051 void wxScrollHelper::HandleOnMouseWheel(wxMouseEvent& event)
1052 {
1053     m_wheelRotation += event.GetWheelRotation();
1054     int lines = m_wheelRotation / event.GetWheelDelta();
1055     m_wheelRotation -= lines * event.GetWheelDelta();
1056
1057     if (lines != 0)
1058     {
1059         lines *= event.GetLinesPerAction();
1060
1061         wxScrollWinEvent newEvent;
1062
1063         newEvent.SetPosition(0);
1064         newEvent.SetOrientation(wxVERTICAL);
1065         newEvent.m_eventObject = m_win;
1066         if (lines > 0)
1067             newEvent.m_eventType = wxEVT_SCROLLWIN_LINEUP;
1068         else
1069             newEvent.m_eventType = wxEVT_SCROLLWIN_LINEDOWN;
1070
1071         int times = abs(lines);
1072         for (; times > 0; times --)
1073             m_win->GetEventHandler()->ProcessEvent(newEvent);
1074
1075         /* Old Way */
1076         // int vsx, vsy;
1077         // GetViewStart(&vsx, &vsy);
1078         // Scroll(-1, vsy - lines);
1079     }
1080 }
1081
1082 #endif // wxUSE_MOUSEWHEEL
1083
1084 // ----------------------------------------------------------------------------
1085 // wxGenericScrolledWindow implementation
1086 // ----------------------------------------------------------------------------
1087
1088 IMPLEMENT_DYNAMIC_CLASS(wxGenericScrolledWindow, wxPanel)
1089
1090 BEGIN_EVENT_TABLE(wxGenericScrolledWindow, wxPanel)
1091     EVT_PAINT(wxGenericScrolledWindow::OnPaint)
1092 END_EVENT_TABLE()
1093
1094 bool wxGenericScrolledWindow::Create(wxWindow *parent,
1095                               wxWindowID id,
1096                               const wxPoint& pos,
1097                               const wxSize& size,
1098                               long style,
1099                               const wxString& name)
1100 {
1101     m_targetWindow = this;
1102
1103     bool ok = wxPanel::Create(parent, id, pos, size, style, name);
1104
1105     return ok;
1106 }
1107
1108 wxGenericScrolledWindow::~wxGenericScrolledWindow()
1109 {
1110 }
1111
1112 void wxGenericScrolledWindow::OnPaint(wxPaintEvent& event)
1113 {
1114     // the user code didn't really draw the window if we got here, so set this
1115     // flag to try to call OnDraw() later
1116     m_handler->ResetDrawnFlag();
1117
1118     event.Skip();
1119 }
1120
1121 #ifdef __WXMSW__
1122 long
1123 wxGenericScrolledWindow::MSWWindowProc(WXUINT nMsg,
1124                                        WXWPARAM wParam,
1125                                        WXLPARAM lParam)
1126 {
1127     long rc = wxPanel::MSWWindowProc(nMsg, wParam, lParam);
1128
1129     // we need to process arrows ourselves for scrolling
1130     if ( nMsg == WM_GETDLGCODE )
1131     {
1132         rc |= DLGC_WANTARROWS;
1133     }
1134
1135     return rc;
1136 }
1137
1138 #endif // __WXMSW__
1139
1140 #if WXWIN_COMPATIBILITY
1141
1142 void wxGenericScrolledWindow::GetScrollUnitsPerPage (int *x_page, int *y_page) const
1143 {
1144       *x_page = GetScrollPageSize(wxHORIZONTAL);
1145       *y_page = GetScrollPageSize(wxVERTICAL);
1146 }
1147
1148 void wxGenericScrolledWindow::CalcUnscrolledPosition(int x, int y, float *xx, float *yy) const
1149 {
1150     if ( xx )
1151         *xx = (float)(x + m_xScrollPosition * m_xScrollPixelsPerLine);
1152     if ( yy )
1153         *yy = (float)(y + m_yScrollPosition * m_yScrollPixelsPerLine);
1154 }
1155
1156 #endif // WXWIN_COMPATIBILITY
1157
1158 #endif // !wxGTK
1159