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 //              Ron Lee on 10.4.02:  virtual size / auto scrollbars et al.
   7 // Created:     01/02/97
   8 // RCS-ID:      $Id$
   9 // Copyright:   (c) wxWindows team
  10 // Licence:     wxWindows license
  11 /////////////////////////////////////////////////////////////////////////////
  12
  13 // ============================================================================
  14 // declarations
  15 // ============================================================================
  16
  17 // ----------------------------------------------------------------------------
  18 // headers
  19 // ----------------------------------------------------------------------------
  20
  21 #ifdef __GNUG__
  22     #pragma implementation "genscrolwin.h"
  23 #endif
  24
  25 #ifdef __VMS
  26 #define XtDisplay XTDISPLAY
  27 #endif
  28
  29 // For compilers that support precompilation, includes "wx.h".
  30 #include "wx/wxprec.h"
  31
  32 #ifdef __BORLANDC__
  33     #pragma hdrstop
  34 #endif
  35
  36 #if !defined(__WXGTK__) || defined(__WXUNIVERSAL__)
  37
  38 #include "wx/utils.h"
  39 #include "wx/dcclient.h"
  40
  41 #include "wx/scrolwin.h"
  42 #include "wx/panel.h"
  43 #include "wx/timer.h"
  44 #include "wx/sizer.h"
  45
  46 #ifdef __WXMSW__
  47     #include <windows.h> // for DLGC_WANTARROWS
  48 #endif
  49
  50 #ifdef __WXMOTIF__
  51 // For wxRETAINED implementation
  52 #ifdef __VMS__ //VMS's Xm.h is not (yet) compatible with C++
  53                //This code switches off the compiler warnings
  54 # pragma message disable nosimpint
  55 #endif
  56 #include <Xm/Xm.h>
  57 #ifdef __VMS__
  58 # pragma message enable nosimpint
  59 #endif
  60 #endif
  61
  62 IMPLEMENT_CLASS(wxScrolledWindow, wxGenericScrolledWindow)
  63
  64 // ----------------------------------------------------------------------------
  65 // wxScrollHelperEvtHandler: intercept the events from the window and forward
  66 // them to wxScrollHelper
  67 // ----------------------------------------------------------------------------
  68
  69 class WXDLLEXPORT wxScrollHelperEvtHandler : public wxEvtHandler
  70 {
  71 public:
  72     wxScrollHelperEvtHandler(wxScrollHelper *scrollHelper)
  73     {
  74         m_scrollHelper = scrollHelper;
  75     }
  76
  77     virtual bool ProcessEvent(wxEvent& event);
  78
  79     void ResetDrawnFlag() { m_hasDrawnWindow = FALSE; }
  80
  81 private:
  82     wxScrollHelper *m_scrollHelper;
  83
  84     bool m_hasDrawnWindow;
  85 };
  86
  87 // ----------------------------------------------------------------------------
  88 // wxAutoScrollTimer: the timer used to generate a stream of scroll events when
  89 // a captured mouse is held outside the window
  90 // ----------------------------------------------------------------------------
  91
  92 class wxAutoScrollTimer : public wxTimer
  93 {
  94 public:
  95     wxAutoScrollTimer(wxWindow *winToScroll, wxScrollHelper *scroll,
  96                       wxEventType eventTypeToSend,
  97                       int pos, int orient);
  98
  99     virtual void Notify();
 100
 101 private:
 102     wxWindow *m_win;
 103     wxScrollHelper *m_scrollHelper;
 104     wxEventType m_eventType;
 105     int m_pos,
 106         m_orient;
 107 };
 108
 109 // ============================================================================
 110 // implementation
 111 // ============================================================================
 112
 113 // ----------------------------------------------------------------------------
 114 // wxAutoScrollTimer
 115 // ----------------------------------------------------------------------------
 116
 117 wxAutoScrollTimer::wxAutoScrollTimer(wxWindow *winToScroll,
 118                                      wxScrollHelper *scroll,
 119                                      wxEventType eventTypeToSend,
 120                                      int pos, int orient)
 121 {
 122     m_win = winToScroll;
 123     m_scrollHelper = scroll;
 124     m_eventType = eventTypeToSend;
 125     m_pos = pos;
 126     m_orient = orient;
 127 }
 128
 129 void wxAutoScrollTimer::Notify()
 130 {
 131     // only do all this as long as the window is capturing the mouse
 132     if ( wxWindow::GetCapture() != m_win )
 133     {
 134         Stop();
 135     }
 136     else // we still capture the mouse, continue generating events
 137     {
 138         // first scroll the window if we are allowed to do it
 139         wxScrollWinEvent event1(m_eventType, m_pos, m_orient);
 140         event1.SetEventObject(m_win);
 141         if ( m_scrollHelper->SendAutoScrollEvents(event1) &&
 142                 m_win->GetEventHandler()->ProcessEvent(event1) )
 143         {
 144             // and then send a pseudo mouse-move event to refresh the selection
 145             wxMouseEvent event2(wxEVT_MOTION);
 146             wxGetMousePosition(&event2.m_x, &event2.m_y);
 147
 148             // the mouse event coordinates should be client, not screen as
 149             // returned by wxGetMousePosition
 150             wxWindow *parentTop = m_win;
 151             while ( parentTop->GetParent() )
 152                 parentTop = parentTop->GetParent();
 153             wxPoint ptOrig = parentTop->GetPosition();
 154             event2.m_x -= ptOrig.x;
 155             event2.m_y -= ptOrig.y;
 156
 157             event2.SetEventObject(m_win);
 158
 159             // FIXME: we don't fill in the other members - ok?
 160
 161             m_win->GetEventHandler()->ProcessEvent(event2);
 162         }
 163         else // can't scroll further, stop
 164         {
 165             Stop();
 166         }
 167     }
 168 }
 169
 170 // ----------------------------------------------------------------------------
 171 // wxScrollHelperEvtHandler
 172 // ----------------------------------------------------------------------------
 173
 174 bool wxScrollHelperEvtHandler::ProcessEvent(wxEvent& event)
 175 {
 176     wxEventType evType = event.GetEventType();
 177
 178     // the explanation of wxEVT_PAINT processing hack: for historic reasons
 179     // there are 2 ways to process this event in classes deriving from
 180     // wxScrolledWindow. The user code may
 181     //
 182     //  1. override wxScrolledWindow::OnDraw(dc)
 183     //  2. define its own OnPaint() handler
 184     //
 185     // In addition, in wxUniversal wxWindow defines OnPaint() itself and
 186     // always processes the draw event, so we can't just try the window
 187     // OnPaint() first and call our HandleOnPaint() if it doesn't process it
 188     // (the latter would never be called in wxUniversal).
 189     //
 190     // So the solution is to have a flag telling us whether the user code drew
 191     // anything in the window. We set it to true here but reset it to false in
 192     // wxScrolledWindow::OnPaint() handler (which wouldn't be called if the
 193     // user code defined OnPaint() in the derived class)
 194     m_hasDrawnWindow = TRUE;
 195
 196     // pass it on to the real handler
 197     bool processed = wxEvtHandler::ProcessEvent(event);
 198
 199     // always process the size events ourselves, even if the user code handles
 200     // them as well, as we need to AdjustScrollbars()
 201     //
 202     // NB: it is important to do it after processing the event in the normal
 203     //     way as HandleOnSize() may generate a wxEVT_SIZE itself if the
 204     //     scrollbar[s] (dis)appear and it should be seen by the user code
 205     //     after this one
 206     if ( evType == wxEVT_SIZE )
 207     {
 208         m_scrollHelper->HandleOnSize((wxSizeEvent &)event);
 209
 210         return TRUE;
 211     }
 212
 213     if ( processed )
 214     {
 215         // normally, nothing more to do here - except if it was a paint event
 216         // which wasn't really processed, then we'll try to call our
 217         // OnDraw() below (from HandleOnPaint)
 218         if ( m_hasDrawnWindow )
 219         {
 220             return TRUE;
 221         }
 222     }
 223
 224     // reset the skipped flag to FALSE as it might have been set to TRUE in
 225     // ProcessEvent() above
 226     event.Skip(FALSE);
 227
 228     if ( evType == wxEVT_PAINT )
 229     {
 230         m_scrollHelper->HandleOnPaint((wxPaintEvent &)event);
 231         return TRUE;
 232     }
 233
 234     if ( evType == wxEVT_SCROLLWIN_TOP ||
 235          evType == wxEVT_SCROLLWIN_BOTTOM ||
 236          evType == wxEVT_SCROLLWIN_LINEUP ||
 237          evType == wxEVT_SCROLLWIN_LINEDOWN ||
 238          evType == wxEVT_SCROLLWIN_PAGEUP ||
 239          evType == wxEVT_SCROLLWIN_PAGEDOWN ||
 240          evType == wxEVT_SCROLLWIN_THUMBTRACK ||
 241          evType == wxEVT_SCROLLWIN_THUMBRELEASE )
 242     {
 243             m_scrollHelper->HandleOnScroll((wxScrollWinEvent &)event);
 244             return !event.GetSkipped();
 245     }
 246
 247     if ( evType == wxEVT_ENTER_WINDOW )
 248     {
 249         m_scrollHelper->HandleOnMouseEnter((wxMouseEvent &)event);
 250     }
 251     else if ( evType == wxEVT_LEAVE_WINDOW )
 252     {
 253         m_scrollHelper->HandleOnMouseLeave((wxMouseEvent &)event);
 254     }
 255 #if wxUSE_MOUSEWHEEL
 256     else if ( evType == wxEVT_MOUSEWHEEL )
 257     {
 258         m_scrollHelper->HandleOnMouseWheel((wxMouseEvent &)event);
 259     }
 260 #endif // wxUSE_MOUSEWHEEL
 261     else if ( evType == wxEVT_CHAR )
 262     {
 263         m_scrollHelper->HandleOnChar((wxKeyEvent &)event);
 264         return !event.GetSkipped();
 265     }
 266
 267     return FALSE;
 268 }
 269
 270 // ----------------------------------------------------------------------------
 271 // wxScrollHelper construction
 272 // ----------------------------------------------------------------------------
 273
 274 wxScrollHelper::wxScrollHelper(wxWindow *win)
 275 {
 276     m_xScrollPixelsPerLine =
 277     m_yScrollPixelsPerLine =
 278     m_xScrollPosition =
 279     m_yScrollPosition =
 280     m_xScrollLines =
 281     m_yScrollLines =
 282     m_xScrollLinesPerPage =
 283     m_yScrollLinesPerPage = 0;
 284
 285     m_xScrollingEnabled =
 286     m_yScrollingEnabled = TRUE;
 287
 288     m_scaleX =
 289     m_scaleY = 1.0;
 290 #if wxUSE_MOUSEWHEEL
 291     m_wheelRotation = 0;
 292 #endif
 293
 294     m_win =
 295     m_targetWindow = (wxWindow *)NULL;
 296
 297     m_timerAutoScroll = (wxTimer *)NULL;
 298
 299     m_handler = NULL;
 300
 301     if ( win )
 302         SetWindow(win);
 303 }
 304
 305 wxScrollHelper::~wxScrollHelper()
 306 {
 307     StopAutoScrolling();
 308
 309     DeleteEvtHandler();
 310 }
 311
 312 // ----------------------------------------------------------------------------
 313 // setting scrolling parameters
 314 // ----------------------------------------------------------------------------
 315
 316 void wxScrollHelper::SetScrollbars(int pixelsPerUnitX,
 317                                    int pixelsPerUnitY,
 318                                    int noUnitsX,
 319                                    int noUnitsY,
 320                                    int xPos,
 321                                    int yPos,
 322                                    bool noRefresh)
 323 {
 324     int xpos, ypos;
 325
 326     CalcUnscrolledPosition(xPos, yPos, &xpos, &ypos);
 327     bool do_refresh =
 328     (
 329       (noUnitsX != 0 && m_xScrollLines == 0) ||
 330       (noUnitsX < m_xScrollLines && xpos > pixelsPerUnitX * noUnitsX) ||
 331
 332       (noUnitsY != 0 && m_yScrollLines == 0) ||
 333       (noUnitsY < m_yScrollLines && ypos > pixelsPerUnitY * noUnitsY) ||
 334       (xPos != m_xScrollPosition) ||
 335       (yPos != m_yScrollPosition)
 336     );
 337
 338     m_xScrollPixelsPerLine = pixelsPerUnitX;
 339     m_yScrollPixelsPerLine = pixelsPerUnitY;
 340     m_xScrollPosition = xPos;
 341     m_yScrollPosition = yPos;
 342
 343     m_targetWindow->SetVirtualSizeHints( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY );
 344
 345     if (do_refresh && !noRefresh)
 346         m_targetWindow->Refresh(TRUE, GetRect());
 347
 348 #ifdef __WXMAC__
 349     m_targetWindow->MacUpdateImmediately() ;
 350 #endif
 351 }
 352
 353 // ----------------------------------------------------------------------------
 354 // [target] window handling
 355 // ----------------------------------------------------------------------------
 356
 357 void wxScrollHelper::DeleteEvtHandler()
 358 {
 359     // search for m_handler in the handler list
 360     if ( m_win && m_handler )
 361     {
 362         if ( m_win->RemoveEventHandler(m_handler) )
 363         {
 364             delete m_handler;
 365         }
 366         //else: something is very wrong, so better [maybe] leak memory than
 367         //      risk a crash because of double deletion
 368
 369         m_handler = NULL;
 370     }
 371 }
 372
 373 void wxScrollHelper::SetWindow(wxWindow *win)
 374 {
 375     wxCHECK_RET( win, _T("wxScrollHelper needs a window to scroll") );
 376
 377     m_win = win;
 378
 379     // by default, the associated window is also the target window
 380     DoSetTargetWindow(win);
 381 }
 382
 383 void wxScrollHelper::DoSetTargetWindow(wxWindow *target)
 384 {
 385     m_targetWindow = target;
 386
 387     // install the event handler which will intercept the events we're
 388     // interested in (but only do it for our real window, not the target window
 389     // which we scroll - we don't need to hijack its events)
 390     if ( m_targetWindow == m_win )
 391     {
 392         // if we already have a handler, delete it first
 393         DeleteEvtHandler();
 394
 395         m_handler = new wxScrollHelperEvtHandler(this);
 396         m_targetWindow->PushEventHandler(m_handler);
 397     }
 398 }
 399
 400 void wxScrollHelper::SetTargetWindow(wxWindow *target)
 401 {
 402     wxCHECK_RET( target, wxT("target window must not be NULL") );
 403
 404     if ( target == m_targetWindow )
 405         return;
 406
 407     DoSetTargetWindow(target);
 408 }
 409
 410 wxWindow *wxScrollHelper::GetTargetWindow() const
 411 {
 412     return m_targetWindow;
 413 }
 414
 415 // ----------------------------------------------------------------------------
 416 // scrolling implementation itself
 417 // ----------------------------------------------------------------------------
 418
 419 void wxScrollHelper::HandleOnScroll(wxScrollWinEvent& event)
 420 {
 421     int nScrollInc = CalcScrollInc(event);
 422     if ( nScrollInc == 0 )
 423     {
 424         // can't scroll further
 425         event.Skip();
 426
 427         return;
 428     }
 429
 430     int orient = event.GetOrientation();
 431     if (orient == wxHORIZONTAL)
 432     {
 433         m_xScrollPosition += nScrollInc;
 434         m_win->SetScrollPos(wxHORIZONTAL, m_xScrollPosition);
 435     }
 436     else
 437     {
 438         m_yScrollPosition += nScrollInc;
 439         m_win->SetScrollPos(wxVERTICAL, m_yScrollPosition);
 440     }
 441
 442     bool needsRefresh = FALSE;
 443     int dx = 0,
 444         dy = 0;
 445     if (orient == wxHORIZONTAL)
 446     {
 447        if ( m_xScrollingEnabled )
 448        {
 449            dx = -m_xScrollPixelsPerLine * nScrollInc;
 450        }
 451        else
 452        {
 453            needsRefresh = TRUE;
 454        }
 455     }
 456     else
 457     {
 458         if ( m_yScrollingEnabled )
 459         {
 460             dy = -m_yScrollPixelsPerLine * nScrollInc;
 461         }
 462         else
 463         {
 464             needsRefresh = TRUE;
 465         }
 466     }
 467
 468     if ( needsRefresh )
 469     {
 470         m_targetWindow->Refresh(TRUE, GetRect());
 471     }
 472     else
 473     {
 474         m_targetWindow->ScrollWindow(dx, dy, GetRect());
 475     }
 476
 477 #ifdef __WXMAC__
 478     m_targetWindow->MacUpdateImmediately() ;
 479 #endif
 480 }
 481
 482 int wxScrollHelper::CalcScrollInc(wxScrollWinEvent& event)
 483 {
 484     int pos = event.GetPosition();
 485     int orient = event.GetOrientation();
 486
 487     int nScrollInc = 0;
 488     if (event.GetEventType() == wxEVT_SCROLLWIN_TOP)
 489     {
 490             if (orient == wxHORIZONTAL)
 491                 nScrollInc = - m_xScrollPosition;
 492             else
 493                 nScrollInc = - m_yScrollPosition;
 494     } else
 495     if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
 496     {
 497             if (orient == wxHORIZONTAL)
 498                 nScrollInc = m_xScrollLines - m_xScrollPosition;
 499             else
 500                 nScrollInc = m_yScrollLines - m_yScrollPosition;
 501     } else
 502     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
 503     {
 504             nScrollInc = -1;
 505     } else
 506     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN)
 507     {
 508             nScrollInc = 1;
 509     } else
 510     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEUP)
 511     {
 512             if (orient == wxHORIZONTAL)
 513                 nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
 514             else
 515                 nScrollInc = -GetScrollPageSize(wxVERTICAL);
 516     } else
 517     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEDOWN)
 518     {
 519             if (orient == wxHORIZONTAL)
 520                 nScrollInc = GetScrollPageSize(wxHORIZONTAL);
 521             else
 522                 nScrollInc = GetScrollPageSize(wxVERTICAL);
 523     } else
 524     if ((event.GetEventType() == wxEVT_SCROLLWIN_THUMBTRACK) ||
 525         (event.GetEventType() == wxEVT_SCROLLWIN_THUMBRELEASE))
 526     {
 527             if (orient == wxHORIZONTAL)
 528                 nScrollInc = pos - m_xScrollPosition;
 529             else
 530                 nScrollInc = pos - m_yScrollPosition;
 531     }
 532
 533     if (orient == wxHORIZONTAL)
 534     {
 535         if (m_xScrollPixelsPerLine > 0)
 536         {
 537             int w, h;
 538             GetTargetSize(&w, &h);
 539
 540             int nMaxWidth = m_xScrollLines*m_xScrollPixelsPerLine;
 541             int noPositions = (int) ( ((nMaxWidth - w)/(double)m_xScrollPixelsPerLine) + 0.5 );
 542             if (noPositions < 0)
 543                 noPositions = 0;
 544
 545             if ( (m_xScrollPosition + nScrollInc) < 0 )
 546                 nScrollInc = -m_xScrollPosition; // As -ve as we can go
 547             else if ( (m_xScrollPosition + nScrollInc) > noPositions )
 548                 nScrollInc = noPositions - m_xScrollPosition; // As +ve as we can go
 549         }
 550         else
 551             m_targetWindow->Refresh(TRUE, GetRect());
 552     }
 553     else
 554     {
 555         if (m_yScrollPixelsPerLine > 0)
 556         {
 557             int w, h;
 558             GetTargetSize(&w, &h);
 559
 560             int nMaxHeight = m_yScrollLines*m_yScrollPixelsPerLine;
 561             int noPositions = (int) ( ((nMaxHeight - h)/(double)m_yScrollPixelsPerLine) + 0.5 );
 562             if (noPositions < 0)
 563                 noPositions = 0;
 564
 565             if ( (m_yScrollPosition + nScrollInc) < 0 )
 566                 nScrollInc = -m_yScrollPosition; // As -ve as we can go
 567             else if ( (m_yScrollPosition + nScrollInc) > noPositions )
 568                 nScrollInc = noPositions - m_yScrollPosition; // As +ve as we can go
 569         }
 570         else
 571             m_targetWindow->Refresh(TRUE, GetRect());
 572     }
 573
 574     return nScrollInc;
 575 }
 576
 577 // Adjust the scrollbars - new version.
 578 void wxScrollHelper::AdjustScrollbars()
 579 {
 580 #ifdef __WXMAC__
 581     m_targetWindow->MacUpdateImmediately();
 582 #endif
 583
 584     int w = 0, h = 0;
 585     int oldw, oldh;
 586
 587     int oldXScroll = m_xScrollPosition;
 588     int oldYScroll = m_yScrollPosition;
 589
 590     do {
 591         GetTargetSize(&w, 0);
 592
 593         if (m_xScrollPixelsPerLine == 0)
 594         {
 595             m_xScrollLines = 0;
 596             m_xScrollPosition = 0;
 597             m_win->SetScrollbar (wxHORIZONTAL, 0, 0, 0, FALSE);
 598         }
 599         else
 600         {
 601             m_xScrollLines = m_targetWindow->GetVirtualSize().GetWidth() / m_xScrollPixelsPerLine;
 602
 603             // Calculate page size i.e. number of scroll units you get on the
 604             // current client window
 605             int noPagePositions = (int) ( (w/(double)m_xScrollPixelsPerLine) + 0.5 );
 606             if (noPagePositions < 1) noPagePositions = 1;
 607             if ( noPagePositions > m_xScrollLines )
 608                 noPagePositions = m_xScrollLines;
 609
 610             // Correct position if greater than extent of canvas minus
 611             // the visible portion of it or if below zero
 612             m_xScrollPosition = wxMin( m_xScrollLines - noPagePositions, m_xScrollPosition);
 613             m_xScrollPosition = wxMax( 0, m_xScrollPosition );
 614
 615             m_win->SetScrollbar(wxHORIZONTAL, m_xScrollPosition, noPagePositions, m_xScrollLines);
 616             // The amount by which we scroll when paging
 617             SetScrollPageSize(wxHORIZONTAL, noPagePositions);
 618         }
 619
 620         GetTargetSize(0, &h);
 621
 622         if (m_yScrollPixelsPerLine == 0)
 623         {
 624             m_yScrollLines = 0;
 625             m_yScrollPosition = 0;
 626             m_win->SetScrollbar (wxVERTICAL, 0, 0, 0, FALSE);
 627         }
 628         else
 629         {
 630             m_yScrollLines = m_targetWindow->GetVirtualSize().GetHeight() / m_yScrollPixelsPerLine;
 631
 632             // Calculate page size i.e. number of scroll units you get on the
 633             // current client window
 634             int noPagePositions = (int) ( (h/(double)m_yScrollPixelsPerLine) + 0.5 );
 635             if (noPagePositions < 1) noPagePositions = 1;
 636             if ( noPagePositions > m_yScrollLines )
 637                 noPagePositions = m_yScrollLines;
 638
 639             // Correct position if greater than extent of canvas minus
 640             // the visible portion of it or if below zero
 641             m_yScrollPosition = wxMin( m_yScrollLines - noPagePositions, m_yScrollPosition );
 642             m_yScrollPosition = wxMax( 0, m_yScrollPosition );
 643
 644             m_win->SetScrollbar(wxVERTICAL, m_yScrollPosition, noPagePositions, m_yScrollLines);
 645             // The amount by which we scroll when paging
 646             SetScrollPageSize(wxVERTICAL, noPagePositions);
 647         }
 648
 649         // If a scrollbar (dis)appeared as a result of this, adjust them again.
 650
 651         oldw = w;
 652         oldh = h;
 653
 654         GetTargetSize( &w, &h );
 655     } while ( w != oldw && h != oldh );
 656
 657 #ifdef __WXMOTIF__
 658     // Sorry, some Motif-specific code to implement a backing pixmap
 659     // for the wxRETAINED style. Implementing a backing store can't
 660     // be entirely generic because it relies on the wxWindowDC implementation
 661     // to duplicate X drawing calls for the backing pixmap.
 662
 663     if ( m_targetWindow->GetWindowStyle() & wxRETAINED )
 664     {
 665         Display* dpy = XtDisplay((Widget)m_targetWindow->GetMainWidget());
 666
 667         int totalPixelWidth = m_xScrollLines * m_xScrollPixelsPerLine;
 668         int totalPixelHeight = m_yScrollLines * m_yScrollPixelsPerLine;
 669         if (m_targetWindow->GetBackingPixmap() &&
 670            !((m_targetWindow->GetPixmapWidth() == totalPixelWidth) &&
 671              (m_targetWindow->GetPixmapHeight() == totalPixelHeight)))
 672         {
 673             XFreePixmap (dpy, (Pixmap) m_targetWindow->GetBackingPixmap());
 674             m_targetWindow->SetBackingPixmap((WXPixmap) 0);
 675         }
 676
 677         if (!m_targetWindow->GetBackingPixmap() &&
 678            (noUnitsX != 0) && (noUnitsY != 0))
 679         {
 680             int depth = wxDisplayDepth();
 681             m_targetWindow->SetPixmapWidth(totalPixelWidth);
 682             m_targetWindow->SetPixmapHeight(totalPixelHeight);
 683             m_targetWindow->SetBackingPixmap((WXPixmap) XCreatePixmap (dpy, RootWindow (dpy, DefaultScreen (dpy)),
 684               m_targetWindow->GetPixmapWidth(), m_targetWindow->GetPixmapHeight(), depth));
 685         }
 686
 687     }
 688 #endif // Motif
 689
 690     if (oldXScroll != m_xScrollPosition)
 691     {
 692        if (m_xScrollingEnabled)
 693             m_targetWindow->ScrollWindow( m_xScrollPixelsPerLine * (oldXScroll - m_xScrollPosition), 0,
 694                                           GetRect() );
 695        else
 696             m_targetWindow->Refresh(TRUE, GetRect());
 697     }
 698
 699     if (oldYScroll != m_yScrollPosition)
 700     {
 701         if (m_yScrollingEnabled)
 702             m_targetWindow->ScrollWindow( 0, m_yScrollPixelsPerLine * (oldYScroll-m_yScrollPosition),
 703                                           GetRect() );
 704         else
 705             m_targetWindow->Refresh(TRUE, GetRect());
 706     }
 707
 708 #ifdef __WXMAC__
 709     m_targetWindow->MacUpdateImmediately();
 710 #endif
 711 }
 712
 713 void wxScrollHelper::DoPrepareDC(wxDC& dc)
 714 {
 715     wxPoint pt = dc.GetDeviceOrigin();
 716     dc.SetDeviceOrigin( pt.x - m_xScrollPosition * m_xScrollPixelsPerLine,
 717                         pt.y - m_yScrollPosition * m_yScrollPixelsPerLine );
 718     dc.SetUserScale( m_scaleX, m_scaleY );
 719 }
 720
 721 void wxScrollHelper::SetScrollRate( int xstep, int ystep )
 722 {
 723     int old_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 724     int old_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 725
 726     m_xScrollPixelsPerLine = xstep;
 727     m_yScrollPixelsPerLine = ystep;
 728
 729     int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 730     int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 731
 732     m_win->SetScrollPos( wxHORIZONTAL, m_xScrollPosition );
 733     m_win->SetScrollPos( wxVERTICAL, m_yScrollPosition );
 734     m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
 735
 736     AdjustScrollbars();
 737 }
 738
 739 void wxScrollHelper::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 740 {
 741     if ( x_unit )
 742         *x_unit = m_xScrollPixelsPerLine;
 743     if ( y_unit )
 744         *y_unit = m_yScrollPixelsPerLine;
 745 }
 746
 747 int wxScrollHelper::GetScrollPageSize(int orient) const
 748 {
 749     if ( orient == wxHORIZONTAL )
 750         return m_xScrollLinesPerPage;
 751     else
 752         return m_yScrollLinesPerPage;
 753 }
 754
 755 void wxScrollHelper::SetScrollPageSize(int orient, int pageSize)
 756 {
 757     if ( orient == wxHORIZONTAL )
 758         m_xScrollLinesPerPage = pageSize;
 759     else
 760         m_yScrollLinesPerPage = pageSize;
 761 }
 762
 763 /*
 764  * Scroll to given position (scroll position, not pixel position)
 765  */
 766 void wxScrollHelper::Scroll( int x_pos, int y_pos )
 767 {
 768     if (!m_targetWindow)
 769         return;
 770
 771     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
 772         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
 773
 774 #ifdef __WXMAC__
 775     m_targetWindow->MacUpdateImmediately();
 776 #endif
 777
 778     int w, h;
 779     GetTargetSize(&w, &h);
 780
 781     if ((x_pos != -1) && (m_xScrollPixelsPerLine))
 782     {
 783         int old_x = m_xScrollPosition;
 784         m_xScrollPosition = x_pos;
 785
 786         // Calculate page size i.e. number of scroll units you get on the
 787         // current client window
 788         int noPagePositions = (int) ( (w/(double)m_xScrollPixelsPerLine) + 0.5 );
 789         if (noPagePositions < 1) noPagePositions = 1;
 790
 791         // Correct position if greater than extent of canvas minus
 792         // the visible portion of it or if below zero
 793         m_xScrollPosition = wxMin( m_xScrollLines-noPagePositions, m_xScrollPosition );
 794         m_xScrollPosition = wxMax( 0, m_xScrollPosition );
 795
 796         if (old_x != m_xScrollPosition) {
 797             m_win->SetScrollPos( wxHORIZONTAL, m_xScrollPosition );
 798             m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0,
 799                                           GetRect() );
 800         }
 801     }
 802     if ((y_pos != -1) && (m_yScrollPixelsPerLine))
 803     {
 804         int old_y = m_yScrollPosition;
 805         m_yScrollPosition = y_pos;
 806
 807         // Calculate page size i.e. number of scroll units you get on the
 808         // current client window
 809         int noPagePositions = (int) ( (h/(double)m_yScrollPixelsPerLine) + 0.5 );
 810         if (noPagePositions < 1) noPagePositions = 1;
 811
 812         // Correct position if greater than extent of canvas minus
 813         // the visible portion of it or if below zero
 814         m_yScrollPosition = wxMin( m_yScrollLines-noPagePositions, m_yScrollPosition );
 815         m_yScrollPosition = wxMax( 0, m_yScrollPosition );
 816
 817         if (old_y != m_yScrollPosition) {
 818             m_win->SetScrollPos( wxVERTICAL, m_yScrollPosition );
 819             m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine,
 820                                           GetRect() );
 821         }
 822     }
 823
 824 #ifdef __WXMAC__
 825     m_targetWindow->MacUpdateImmediately();
 826 #endif
 827
 828 }
 829
 830 void wxScrollHelper::EnableScrolling (bool x_scroll, bool y_scroll)
 831 {
 832     m_xScrollingEnabled = x_scroll;
 833     m_yScrollingEnabled = y_scroll;
 834 }
 835
 836 // Where the current view starts from
 837 void wxScrollHelper::GetViewStart (int *x, int *y) const
 838 {
 839     if ( x )
 840         *x = m_xScrollPosition;
 841     if ( y )
 842         *y = m_yScrollPosition;
 843 }
 844
 845 void wxScrollHelper::DoCalcScrolledPosition(int x, int y, int *xx, int *yy) const
 846 {
 847     if ( xx )
 848         *xx = x - m_xScrollPosition * m_xScrollPixelsPerLine;
 849     if ( yy )
 850         *yy = y - m_yScrollPosition * m_yScrollPixelsPerLine;
 851 }
 852
 853 void wxScrollHelper::DoCalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
 854 {
 855     if ( xx )
 856         *xx = x + m_xScrollPosition * m_xScrollPixelsPerLine;
 857     if ( yy )
 858         *yy = y + m_yScrollPosition * m_yScrollPixelsPerLine;
 859 }
 860
 861 // ----------------------------------------------------------------------------
 862 // event handlers
 863 // ----------------------------------------------------------------------------
 864
 865 // Default OnSize resets scrollbars, if any
 866 void wxScrollHelper::HandleOnSize(wxSizeEvent& WXUNUSED(event))
 867 {
 868     if( m_targetWindow != m_win )
 869         m_targetWindow->SetVirtualSize( m_targetWindow->GetClientSize() );
 870
 871     m_win->SetVirtualSize( m_win->GetClientSize() );
 872
 873 #if wxUSE_CONSTRAINTS
 874     if (m_win->GetAutoLayout())
 875         m_win->Layout();
 876 #endif
 877 }
 878
 879 // This calls OnDraw, having adjusted the origin according to the current
 880 // scroll position
 881 void wxScrollHelper::HandleOnPaint(wxPaintEvent& WXUNUSED(event))
 882 {
 883     // don't use m_targetWindow here, this is always called for ourselves
 884     wxPaintDC dc(m_win);
 885     DoPrepareDC(dc);
 886
 887     OnDraw(dc);
 888 }
 889
 890 // kbd handling: notice that we use OnChar() and not OnKeyDown() for
 891 // compatibility here - if we used OnKeyDown(), the programs which process
 892 // arrows themselves in their OnChar() would never get the message and like
 893 // this they always have the priority
 894 void wxScrollHelper::HandleOnChar(wxKeyEvent& event)
 895 {
 896     int stx, sty,       // view origin
 897         szx, szy,       // view size (total)
 898         clix, cliy;     // view size (on screen)
 899
 900     GetViewStart(&stx, &sty);
 901     GetTargetSize(&clix, &cliy);
 902     m_targetWindow->GetVirtualSize(&szx, &szy);
 903
 904     if( m_xScrollPixelsPerLine )
 905     {
 906         clix /= m_xScrollPixelsPerLine;
 907         szx /= m_xScrollPixelsPerLine;
 908     }
 909     else
 910     {
 911         clix = 0;
 912         szx = -1;
 913     }
 914     if( m_yScrollPixelsPerLine )
 915     {
 916         cliy /= m_yScrollPixelsPerLine;
 917         szy /= m_yScrollPixelsPerLine;
 918     }
 919     else
 920     {
 921         cliy = 0;
 922         szy = -1;
 923     }
 924
 925     int xScrollOld = m_xScrollPosition,
 926         yScrollOld = m_yScrollPosition;
 927
 928     int dsty;
 929     switch ( event.KeyCode() )
 930     {
 931         case WXK_PAGEUP:
 932         case WXK_PRIOR:
 933             dsty = sty - (5 * cliy / 6);
 934             Scroll(-1, (dsty == -1) ? 0 : dsty);
 935             break;
 936
 937         case WXK_PAGEDOWN:
 938         case WXK_NEXT:
 939             Scroll(-1, sty + (5 * cliy / 6));
 940             break;
 941
 942         case WXK_HOME:
 943             Scroll(0, event.ControlDown() ? 0 : -1);
 944             break;
 945
 946         case WXK_END:
 947             Scroll(szx - clix, event.ControlDown() ? szy - cliy : -1);
 948             break;
 949
 950         case WXK_UP:
 951             Scroll(-1, sty - 1);
 952             break;
 953
 954         case WXK_DOWN:
 955             Scroll(-1, sty + 1);
 956             break;
 957
 958         case WXK_LEFT:
 959             Scroll(stx - 1, -1);
 960             break;
 961
 962         case WXK_RIGHT:
 963             Scroll(stx + 1, -1);
 964             break;
 965
 966         default:
 967             // not for us
 968             event.Skip();
 969     }
 970
 971     if ( m_xScrollPosition != xScrollOld )
 972     {
 973         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, m_xScrollPosition,
 974                                wxHORIZONTAL);
 975         event.SetEventObject(m_win);
 976         m_win->GetEventHandler()->ProcessEvent(event);
 977     }
 978
 979     if ( m_yScrollPosition != yScrollOld )
 980     {
 981         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, m_yScrollPosition,
 982                                wxVERTICAL);
 983         event.SetEventObject(m_win);
 984         m_win->GetEventHandler()->ProcessEvent(event);
 985     }
 986 }
 987
 988 // ----------------------------------------------------------------------------
 989 // autoscroll stuff: these functions deal with sending fake scroll events when
 990 // a captured mouse is being held outside the window
 991 // ----------------------------------------------------------------------------
 992
 993 bool wxScrollHelper::SendAutoScrollEvents(wxScrollWinEvent& event) const
 994 {
 995     // only send the event if the window is scrollable in this direction
 996     wxWindow *win = (wxWindow *)event.GetEventObject();
 997     return win->HasScrollbar(event.GetOrientation());
 998 }
 999
1000 void wxScrollHelper::StopAutoScrolling()
1001 {
1002     if ( m_timerAutoScroll )
1003     {
1004         delete m_timerAutoScroll;
1005         m_timerAutoScroll = (wxTimer *)NULL;
1006     }
1007 }
1008
1009 void wxScrollHelper::HandleOnMouseEnter(wxMouseEvent& event)
1010 {
1011     StopAutoScrolling();
1012
1013     event.Skip();
1014 }
1015
1016 void wxScrollHelper::HandleOnMouseLeave(wxMouseEvent& event)
1017 {
1018     // don't prevent the usual processing of the event from taking place
1019     event.Skip();
1020
1021     // when a captured mouse leave a scrolled window we start generate
1022     // scrolling events to allow, for example, extending selection beyond the
1023     // visible area in some controls
1024     if ( wxWindow::GetCapture() == m_targetWindow )
1025     {
1026         // where is the mouse leaving?
1027         int pos, orient;
1028         wxPoint pt = event.GetPosition();
1029         if ( pt.x < 0 )
1030         {
1031             orient = wxHORIZONTAL;
1032             pos = 0;
1033         }
1034         else if ( pt.y < 0 )
1035         {
1036             orient = wxVERTICAL;
1037             pos = 0;
1038         }
1039         else // we're lower or to the right of the window
1040         {
1041             wxSize size = m_targetWindow->GetClientSize();
1042             if ( pt.x > size.x )
1043             {
1044                 orient = wxHORIZONTAL;
1045                 pos = m_xScrollLines;
1046             }
1047             else if ( pt.y > size.y )
1048             {
1049                 orient = wxVERTICAL;
1050                 pos = m_yScrollLines;
1051             }
1052             else // this should be impossible
1053             {
1054                 // but seems to happen sometimes under wxMSW - maybe it's a bug
1055                 // there but for now just ignore it
1056
1057                 //wxFAIL_MSG( _T("can't understand where has mouse gone") );
1058
1059                 return;
1060             }
1061         }
1062
1063         // only start the auto scroll timer if the window can be scrolled in
1064         // this direction
1065         if ( !m_targetWindow->HasScrollbar(orient) )
1066             return;
1067
1068         delete m_timerAutoScroll;
1069         m_timerAutoScroll = new wxAutoScrollTimer
1070                                 (
1071                                     m_targetWindow, this,
1072                                     pos == 0 ? wxEVT_SCROLLWIN_LINEUP
1073                                              : wxEVT_SCROLLWIN_LINEDOWN,
1074                                     pos,
1075                                     orient
1076                                 );
1077         m_timerAutoScroll->Start(50); // FIXME: make configurable
1078     }
1079 }
1080
1081 #if wxUSE_MOUSEWHEEL
1082
1083 void wxScrollHelper::HandleOnMouseWheel(wxMouseEvent& event)
1084 {
1085     m_wheelRotation += event.GetWheelRotation();
1086     int lines = m_wheelRotation / event.GetWheelDelta();
1087     m_wheelRotation -= lines * event.GetWheelDelta();
1088
1089     if (lines != 0)
1090     {
1091         lines *= event.GetLinesPerAction();
1092
1093         wxScrollWinEvent newEvent;
1094
1095         newEvent.SetPosition(0);
1096         newEvent.SetOrientation(wxVERTICAL);
1097         newEvent.m_eventObject = m_win;
1098         if (lines > 0)
1099             newEvent.m_eventType = wxEVT_SCROLLWIN_LINEUP;
1100         else
1101             newEvent.m_eventType = wxEVT_SCROLLWIN_LINEDOWN;
1102
1103         int times = abs(lines);
1104         for (; times > 0; times --)
1105             m_win->GetEventHandler()->ProcessEvent(newEvent);
1106
1107         /* Old Way */
1108         // int vsx, vsy;
1109         // GetViewStart(&vsx, &vsy);
1110         // Scroll(-1, vsy - lines);
1111     }
1112 }
1113
1114 #endif // wxUSE_MOUSEWHEEL
1115
1116 // ----------------------------------------------------------------------------
1117 // wxGenericScrolledWindow implementation
1118 // ----------------------------------------------------------------------------
1119
1120 IMPLEMENT_DYNAMIC_CLASS(wxGenericScrolledWindow, wxPanel)
1121
1122 BEGIN_EVENT_TABLE(wxGenericScrolledWindow, wxPanel)
1123     EVT_PAINT(wxGenericScrolledWindow::OnPaint)
1124 END_EVENT_TABLE()
1125
1126 bool wxGenericScrolledWindow::Create(wxWindow *parent,
1127                               wxWindowID id,
1128                               const wxPoint& pos,
1129                               const wxSize& size,
1130                               long style,
1131                               const wxString& name)
1132 {
1133     m_targetWindow = this;
1134
1135     bool ok = wxPanel::Create(parent, id, pos, size, style, name);
1136
1137     return ok;
1138 }
1139
1140 wxGenericScrolledWindow::~wxGenericScrolledWindow()
1141 {
1142 }
1143
1144 bool wxGenericScrolledWindow::Layout()
1145 {
1146     if (GetSizer() && m_targetWindow == this)
1147     {
1148         // If we're the scroll target, take into account the
1149         // virtual size and scrolled position of the window.
1150
1151         int x, y, w, h;
1152         CalcScrolledPosition(0,0, &x,&y);
1153         GetVirtualSize(&w, &h);
1154         GetSizer()->SetDimension(x, y, w, h);
1155         return TRUE;
1156     }
1157
1158     // fall back to default for LayoutConstraints
1159     return wxPanel::Layout();
1160 }
1161
1162 void wxGenericScrolledWindow::DoSetVirtualSize( int x, int y )
1163 {
1164     wxPanel::DoSetVirtualSize( x, y );
1165     AdjustScrollbars();
1166 }
1167
1168 void wxGenericScrolledWindow::OnPaint(wxPaintEvent& event)
1169 {
1170     // the user code didn't really draw the window if we got here, so set this
1171     // flag to try to call OnDraw() later
1172     m_handler->ResetDrawnFlag();
1173
1174     event.Skip();
1175 }
1176
1177 #ifdef __WXMSW__
1178 long
1179 wxGenericScrolledWindow::MSWWindowProc(WXUINT nMsg,
1180                                        WXWPARAM wParam,
1181                                        WXLPARAM lParam)
1182 {
1183     long rc = wxPanel::MSWWindowProc(nMsg, wParam, lParam);
1184
1185     // we need to process arrows ourselves for scrolling
1186     if ( nMsg == WM_GETDLGCODE )
1187     {
1188         rc |= DLGC_WANTARROWS;
1189     }
1190
1191     return rc;
1192 }
1193
1194 #endif // __WXMSW__
1195
1196 #if WXWIN_COMPATIBILITY
1197
1198 void wxGenericScrolledWindow::GetScrollUnitsPerPage (int *x_page, int *y_page) const
1199 {
1200       *x_page = GetScrollPageSize(wxHORIZONTAL);
1201       *y_page = GetScrollPageSize(wxVERTICAL);
1202 }
1203
1204 void wxGenericScrolledWindow::CalcUnscrolledPosition(int x, int y, float *xx, float *yy) const
1205 {
1206     if ( xx )
1207         *xx = (float)(x + m_xScrollPosition * m_xScrollPixelsPerLine);
1208     if ( yy )
1209         *yy = (float)(y + m_yScrollPosition * m_yScrollPixelsPerLine);
1210 }
1211
1212 #endif // WXWIN_COMPATIBILITY
1213
1214 #endif // !wxGTK
1215
1216 // vi:sts=4:sw=4:et