src/generic/scrolwin.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        generic/scrolwin.cpp
   3 // Purpose:     wxGenericScrolledWindow implementation
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21     #pragma implementation "scrolwin.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 #include "wx/utils.h"
  36 #include "wx/dcclient.h"
  37
  38 #include "wx/generic/scrolwin.h"
  39 #include "wx/panel.h"
  40
  41 #ifdef __WXMSW__
  42     #include "windows.h"
  43 #endif
  44
  45 #ifdef __WXMOTIF__
  46 // For wxRETAINED implementation
  47 #ifdef __VMS__ //VMS's Xm.h is not (yet) compatible with C++
  48                //This code switches off the compiler warnings
  49 # pragma message disable nosimpint
  50 #endif
  51 #include <Xm/Xm.h>
  52 #ifdef __VMS__
  53 # pragma message enable nosimpint
  54 #endif
  55 #endif
  56
  57 #ifndef __WXGTK__
  58 #include "wx/scrolwin.h"
  59 IMPLEMENT_CLASS(wxScrolledWindow, wxGenericScrolledWindow)
  60 #endif
  61
  62 // ----------------------------------------------------------------------------
  63 // event tables
  64 // ----------------------------------------------------------------------------
  65
  66 BEGIN_EVENT_TABLE(wxGenericScrolledWindow, wxPanel)
  67     EVT_SCROLLWIN(wxGenericScrolledWindow::OnScroll)
  68     EVT_SIZE(wxGenericScrolledWindow::OnSize)
  69     EVT_PAINT(wxGenericScrolledWindow::OnPaint)
  70     EVT_CHAR(wxGenericScrolledWindow::OnChar)
  71     EVT_MOUSEWHEEL(wxGenericScrolledWindow::OnMouseWheel)
  72 END_EVENT_TABLE()
  73
  74 IMPLEMENT_DYNAMIC_CLASS(wxGenericScrolledWindow, wxPanel)
  75
  76 // ============================================================================
  77 // implementation
  78 // ============================================================================
  79
  80 // ----------------------------------------------------------------------------
  81 // wxGenericScrolledWindow creation
  82 // ----------------------------------------------------------------------------
  83
  84 wxGenericScrolledWindow::wxGenericScrolledWindow()
  85 {
  86     m_xScrollPixelsPerLine = 0;
  87     m_yScrollPixelsPerLine = 0;
  88     m_xScrollingEnabled = TRUE;
  89     m_yScrollingEnabled = TRUE;
  90     m_xScrollPosition = 0;
  91     m_yScrollPosition = 0;
  92     m_xScrollLines = 0;
  93     m_yScrollLines = 0;
  94     m_xScrollLinesPerPage = 0;
  95     m_yScrollLinesPerPage = 0;
  96     m_scaleX = 1.0;
  97     m_scaleY = 1.0;
  98     m_wheelRotation = 0;
  99     m_targetWindow = (wxWindow*) NULL;
 100 }
 101
 102 bool wxGenericScrolledWindow::Create(wxWindow *parent,
 103                               wxWindowID id,
 104                               const wxPoint& pos,
 105                               const wxSize& size,
 106                               long style,
 107                               const wxString& name)
 108 {
 109     m_xScrollPixelsPerLine = 0;
 110     m_yScrollPixelsPerLine = 0;
 111     m_xScrollingEnabled = TRUE;
 112     m_yScrollingEnabled = TRUE;
 113     m_xScrollPosition = 0;
 114     m_yScrollPosition = 0;
 115     m_xScrollLines = 0;
 116     m_yScrollLines = 0;
 117     m_xScrollLinesPerPage = 0;
 118     m_yScrollLinesPerPage = 0;
 119     m_scaleX = 1.0;
 120     m_scaleY = 1.0;
 121     m_wheelRotation = 0;
 122
 123     m_targetWindow = this;
 124
 125     bool ok = wxPanel::Create(parent, id, pos, size, style, name);
 126
 127 #ifdef __WXMSW__
 128     // we need to process arrows ourselves for scrolling
 129     m_lDlgCode |= DLGC_WANTARROWS;
 130 #endif // __WXMSW__
 131
 132     return ok;
 133 }
 134
 135 wxGenericScrolledWindow::~wxGenericScrolledWindow()
 136 {
 137 }
 138
 139 // ----------------------------------------------------------------------------
 140 // setting scrolling parameters
 141 // ----------------------------------------------------------------------------
 142
 143 /*
 144  * pixelsPerUnitX/pixelsPerUnitY: number of pixels per unit (e.g. pixels per text line)
 145  * noUnitsX/noUnitsY:        : no. units per scrollbar
 146  */
 147 void wxGenericScrolledWindow::SetScrollbars (int pixelsPerUnitX, int pixelsPerUnitY,
 148                int noUnitsX, int noUnitsY,
 149                int xPos, int yPos, bool noRefresh )
 150 {
 151     int xpos, ypos;
 152
 153     CalcUnscrolledPosition(xPos, yPos, &xpos, &ypos);
 154     bool do_refresh =
 155     (
 156       (noUnitsX != 0 && m_xScrollLines == 0) ||
 157       (noUnitsX < m_xScrollLines && xpos > pixelsPerUnitX*noUnitsX) ||
 158
 159       (noUnitsY != 0 && m_yScrollLines == 0) ||
 160       (noUnitsY < m_yScrollLines && ypos > pixelsPerUnitY*noUnitsY) ||
 161       (xPos != m_xScrollPosition) ||
 162       (yPos != m_yScrollPosition)
 163 //       (pixelsPerUnitX != m_xScrollPixelsPerLine) ||
 164 //       (pixelsPerUnitY != m_yScrollPixelsPerLine)
 165     );
 166
 167     m_xScrollPixelsPerLine = pixelsPerUnitX;
 168     m_yScrollPixelsPerLine = pixelsPerUnitY;
 169     m_xScrollPosition = xPos;
 170     m_yScrollPosition = yPos;
 171     m_xScrollLines = noUnitsX;
 172     m_yScrollLines = noUnitsY;
 173
 174 #ifdef __WXMOTIF__
 175     // Sorry, some Motif-specific code to implement a backing pixmap
 176     // for the wxRETAINED style. Implementing a backing store can't
 177     // be entirely generic because it relies on the wxWindowDC implementation
 178     // to duplicate X drawing calls for the backing pixmap.
 179
 180     if ((m_windowStyle & wxRETAINED) == wxRETAINED)
 181     {
 182         Display* dpy = XtDisplay((Widget) GetMainWidget());
 183
 184         int totalPixelWidth = m_xScrollLines * m_xScrollPixelsPerLine;
 185         int totalPixelHeight = m_yScrollLines * m_yScrollPixelsPerLine;
 186         if (m_backingPixmap &&
 187            !((m_pixmapWidth == totalPixelWidth) &&
 188              (m_pixmapHeight == totalPixelHeight)))
 189         {
 190             XFreePixmap (dpy, (Pixmap) m_backingPixmap);
 191             m_backingPixmap = (WXPixmap) 0;
 192         }
 193
 194         if (!m_backingPixmap &&
 195            (noUnitsX != 0) && (noUnitsY != 0))
 196         {
 197             int depth = wxDisplayDepth();
 198             m_pixmapWidth = totalPixelWidth;
 199             m_pixmapHeight = totalPixelHeight;
 200             m_backingPixmap = (WXPixmap) XCreatePixmap (dpy, RootWindow (dpy, DefaultScreen (dpy)),
 201             m_pixmapWidth, m_pixmapHeight, depth);
 202         }
 203
 204     }
 205 #endif // Motif
 206
 207     AdjustScrollbars();
 208
 209     if (do_refresh && !noRefresh)
 210         m_targetWindow->Refresh();
 211
 212 #ifdef __WXMSW__
 213     // GRG: if this turns out to be really necessary, we could
 214     //   at least move it to the above if { ... } so that it is
 215     //   only done if noRefresh = FALSE (the default). OTOH, if
 216     //   this doesn't break anything, which seems to be the
 217     //   case, we could just leave it out.
 218
 219     // Necessary?
 220     // UpdateWindow ((HWND) m_targetWindow->GetHWND());
 221 #endif
 222 #ifdef __WXMAC__
 223     m_targetWindow->MacUpdateImmediately() ;
 224 #endif
 225 }
 226
 227 // ----------------------------------------------------------------------------
 228 // target window handling
 229 // ----------------------------------------------------------------------------
 230
 231 void wxGenericScrolledWindow::SetTargetWindow( wxWindow *target )
 232 {
 233     wxASSERT_MSG( target, wxT("target window must not be NULL") );
 234     m_targetWindow = target;
 235 }
 236
 237 wxWindow *wxGenericScrolledWindow::GetTargetWindow()
 238 {
 239     return m_targetWindow;
 240 }
 241
 242 // ----------------------------------------------------------------------------
 243 // scrolling implementation itself
 244 // ----------------------------------------------------------------------------
 245
 246 void wxGenericScrolledWindow::OnScroll(wxScrollWinEvent& event)
 247 {
 248     int orient = event.GetOrientation();
 249
 250     int nScrollInc = CalcScrollInc(event);
 251     if (nScrollInc == 0) return;
 252
 253     if (orient == wxHORIZONTAL)
 254     {
 255         int newPos = m_xScrollPosition + nScrollInc;
 256         SetScrollPos(wxHORIZONTAL, newPos, TRUE );
 257     }
 258     else
 259     {
 260         int newPos = m_yScrollPosition + nScrollInc;
 261         SetScrollPos(wxVERTICAL, newPos, TRUE );
 262     }
 263
 264     if (orient == wxHORIZONTAL)
 265     {
 266         m_xScrollPosition += nScrollInc;
 267     }
 268     else
 269     {
 270         m_yScrollPosition += nScrollInc;
 271     }
 272
 273     if (orient == wxHORIZONTAL)
 274     {
 275        if (m_xScrollingEnabled)
 276             m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
 277        else
 278             m_targetWindow->Refresh();
 279     }
 280     else
 281     {
 282         if (m_yScrollingEnabled)
 283             m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
 284         else
 285             m_targetWindow->Refresh();
 286     }
 287 #ifdef __WXMAC__
 288     m_targetWindow->MacUpdateImmediately() ;
 289 #endif
 290 }
 291
 292 int wxGenericScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
 293 {
 294     int pos = event.GetPosition();
 295     int orient = event.GetOrientation();
 296
 297     int nScrollInc = 0;
 298     if (event.GetEventType() == wxEVT_SCROLLWIN_TOP)
 299     {
 300             if (orient == wxHORIZONTAL)
 301                 nScrollInc = - m_xScrollPosition;
 302             else
 303                 nScrollInc = - m_yScrollPosition;
 304     } else
 305     if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
 306     {
 307             if (orient == wxHORIZONTAL)
 308                 nScrollInc = m_xScrollLines - m_xScrollPosition;
 309             else
 310                 nScrollInc = m_yScrollLines - m_yScrollPosition;
 311     } else
 312     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
 313     {
 314             nScrollInc = -1;
 315     } else
 316     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN)
 317     {
 318             nScrollInc = 1;
 319     } else
 320     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEUP)
 321     {
 322             if (orient == wxHORIZONTAL)
 323                 nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
 324             else
 325                 nScrollInc = -GetScrollPageSize(wxVERTICAL);
 326     } else
 327     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEDOWN)
 328     {
 329             if (orient == wxHORIZONTAL)
 330                 nScrollInc = GetScrollPageSize(wxHORIZONTAL);
 331             else
 332                 nScrollInc = GetScrollPageSize(wxVERTICAL);
 333     } else
 334     if ((event.GetEventType() == wxEVT_SCROLLWIN_THUMBTRACK) ||
 335         (event.GetEventType() == wxEVT_SCROLLWIN_THUMBRELEASE))
 336     {
 337             if (orient == wxHORIZONTAL)
 338                 nScrollInc = pos - m_xScrollPosition;
 339             else
 340                 nScrollInc = pos - m_yScrollPosition;
 341     }
 342
 343     if (orient == wxHORIZONTAL)
 344     {
 345         if (m_xScrollPixelsPerLine > 0)
 346         {
 347             int w, h;
 348             m_targetWindow->GetClientSize(&w, &h);
 349
 350             int nMaxWidth = m_xScrollLines*m_xScrollPixelsPerLine;
 351             int noPositions = (int) ( ((nMaxWidth - w)/(double)m_xScrollPixelsPerLine) + 0.5 );
 352             if (noPositions < 0)
 353                 noPositions = 0;
 354
 355             if ( (m_xScrollPosition + nScrollInc) < 0 )
 356                 nScrollInc = -m_xScrollPosition; // As -ve as we can go
 357             else if ( (m_xScrollPosition + nScrollInc) > noPositions )
 358                 nScrollInc = noPositions - m_xScrollPosition; // As +ve as we can go
 359         }
 360         else
 361             m_targetWindow->Refresh();
 362     }
 363     else
 364     {
 365         if (m_yScrollPixelsPerLine > 0)
 366         {
 367             int w, h;
 368             m_targetWindow->GetClientSize(&w, &h);
 369
 370             int nMaxHeight = m_yScrollLines*m_yScrollPixelsPerLine;
 371             int noPositions = (int) ( ((nMaxHeight - h)/(double)m_yScrollPixelsPerLine) + 0.5 );
 372             if (noPositions < 0)
 373                 noPositions = 0;
 374
 375             if ( (m_yScrollPosition + nScrollInc) < 0 )
 376                 nScrollInc = -m_yScrollPosition; // As -ve as we can go
 377             else if ( (m_yScrollPosition + nScrollInc) > noPositions )
 378                 nScrollInc = noPositions - m_yScrollPosition; // As +ve as we can go
 379         }
 380         else
 381             m_targetWindow->Refresh();
 382     }
 383
 384     return nScrollInc;
 385 }
 386
 387 // Adjust the scrollbars - new version.
 388 void wxGenericScrolledWindow::AdjustScrollbars()
 389 {
 390     int w, h;
 391     m_targetWindow->GetClientSize(&w, &h);
 392
 393     int oldXScroll = m_xScrollPosition;
 394     int oldYScroll = m_yScrollPosition;
 395
 396     if (m_xScrollLines > 0)
 397     {
 398         // Calculate page size i.e. number of scroll units you get on the
 399         // current client window
 400         int noPagePositions = (int) ( (w/(double)m_xScrollPixelsPerLine) + 0.5 );
 401         if (noPagePositions < 1) noPagePositions = 1;
 402
 403         // Correct position if greater than extent of canvas minus
 404         // the visible portion of it or if below zero
 405         m_xScrollPosition = wxMin( m_xScrollLines-noPagePositions, m_xScrollPosition);
 406         m_xScrollPosition = wxMax( 0, m_xScrollPosition );
 407
 408         SetScrollbar(wxHORIZONTAL, m_xScrollPosition, noPagePositions, m_xScrollLines);
 409         // The amount by which we scroll when paging
 410         SetScrollPageSize(wxHORIZONTAL, noPagePositions);
 411     }
 412     else
 413     {
 414         m_xScrollPosition = 0;
 415         SetScrollbar (wxHORIZONTAL, 0, 0, 0, FALSE);
 416     }
 417
 418     if (m_yScrollLines > 0)
 419     {
 420         // Calculate page size i.e. number of scroll units you get on the
 421         // current client window
 422         int noPagePositions = (int) ( (h/(double)m_yScrollPixelsPerLine) + 0.5 );
 423         if (noPagePositions < 1) noPagePositions = 1;
 424
 425         // Correct position if greater than extent of canvas minus
 426         // the visible portion of it or if below zero
 427         m_yScrollPosition = wxMin( m_yScrollLines-noPagePositions, m_yScrollPosition );
 428         m_yScrollPosition = wxMax( 0, m_yScrollPosition );
 429
 430         SetScrollbar(wxVERTICAL, m_yScrollPosition, noPagePositions, m_yScrollLines);
 431         // The amount by which we scroll when paging
 432         SetScrollPageSize(wxVERTICAL, noPagePositions);
 433     }
 434     else
 435     {
 436         m_yScrollPosition = 0;
 437         SetScrollbar (wxVERTICAL, 0, 0, 0, FALSE);
 438     }
 439
 440     if (oldXScroll != m_xScrollPosition)
 441     {
 442        if (m_xScrollingEnabled)
 443             m_targetWindow->ScrollWindow( m_xScrollPixelsPerLine * (oldXScroll-m_xScrollPosition), 0, (const wxRect *) NULL );
 444        else
 445             m_targetWindow->Refresh();
 446     }
 447
 448     if (oldYScroll != m_yScrollPosition)
 449     {
 450         if (m_yScrollingEnabled)
 451             m_targetWindow->ScrollWindow( 0, m_yScrollPixelsPerLine * (oldYScroll-m_yScrollPosition), (const wxRect *) NULL );
 452         else
 453             m_targetWindow->Refresh();
 454     }
 455 }
 456
 457 // Override this function if you don't want to have wxGenericScrolledWindow
 458 // automatically change the origin according to the scroll position.
 459 void wxGenericScrolledWindow::PrepareDC(wxDC& dc)
 460 {
 461     dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,
 462                         -m_yScrollPosition * m_yScrollPixelsPerLine );
 463     dc.SetUserScale( m_scaleX, m_scaleY );
 464 }
 465
 466 #if WXWIN_COMPATIBILITY
 467 void wxGenericScrolledWindow::GetScrollUnitsPerPage (int *x_page, int *y_page) const
 468 {
 469       *x_page = GetScrollPageSize(wxHORIZONTAL);
 470       *y_page = GetScrollPageSize(wxVERTICAL);
 471 }
 472
 473 void wxGenericScrolledWindow::CalcUnscrolledPosition(int x, int y, float *xx, float *yy) const
 474 {
 475     if ( xx )
 476         *xx = (float)(x + m_xScrollPosition * m_xScrollPixelsPerLine);
 477     if ( yy )
 478         *yy = (float)(y + m_yScrollPosition * m_yScrollPixelsPerLine);
 479 }
 480 #endif // WXWIN_COMPATIBILITY
 481
 482 void wxGenericScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 483 {
 484     if ( x_unit )
 485         *x_unit = m_xScrollPixelsPerLine;
 486     if ( y_unit )
 487         *y_unit = m_yScrollPixelsPerLine;
 488 }
 489
 490 int wxGenericScrolledWindow::GetScrollPageSize(int orient) const
 491 {
 492     if ( orient == wxHORIZONTAL )
 493         return m_xScrollLinesPerPage;
 494     else
 495         return m_yScrollLinesPerPage;
 496 }
 497
 498 void wxGenericScrolledWindow::SetScrollPageSize(int orient, int pageSize)
 499 {
 500     if ( orient == wxHORIZONTAL )
 501         m_xScrollLinesPerPage = pageSize;
 502     else
 503         m_yScrollLinesPerPage = pageSize;
 504 }
 505
 506 /*
 507  * Scroll to given position (scroll position, not pixel position)
 508  */
 509 void wxGenericScrolledWindow::Scroll( int x_pos, int y_pos )
 510 {
 511     if (!m_targetWindow)
 512         return;
 513
 514     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
 515         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
 516
 517     int w, h;
 518     m_targetWindow->GetClientSize(&w, &h);
 519
 520     if ((x_pos != -1) && (m_xScrollPixelsPerLine))
 521     {
 522         int old_x = m_xScrollPosition;
 523         m_xScrollPosition = x_pos;
 524
 525         // Calculate page size i.e. number of scroll units you get on the
 526         // current client window
 527         int noPagePositions = (int) ( (w/(double)m_xScrollPixelsPerLine) + 0.5 );
 528         if (noPagePositions < 1) noPagePositions = 1;
 529
 530         // Correct position if greater than extent of canvas minus
 531         // the visible portion of it or if below zero
 532         m_xScrollPosition = wxMin( m_xScrollLines-noPagePositions, m_xScrollPosition );
 533         m_xScrollPosition = wxMax( 0, m_xScrollPosition );
 534
 535         if (old_x != m_xScrollPosition) {
 536             m_targetWindow->SetScrollPos( wxHORIZONTAL, m_xScrollPosition, TRUE );
 537             m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
 538         }
 539     }
 540     if ((y_pos != -1) && (m_yScrollPixelsPerLine))
 541     {
 542         int old_y = m_yScrollPosition;
 543         m_yScrollPosition = y_pos;
 544
 545         // Calculate page size i.e. number of scroll units you get on the
 546         // current client window
 547         int noPagePositions = (int) ( (h/(double)m_yScrollPixelsPerLine) + 0.5 );
 548         if (noPagePositions < 1) noPagePositions = 1;
 549
 550         // Correct position if greater than extent of canvas minus
 551         // the visible portion of it or if below zero
 552         m_yScrollPosition = wxMin( m_yScrollLines-noPagePositions, m_yScrollPosition );
 553         m_yScrollPosition = wxMax( 0, m_yScrollPosition );
 554
 555         if (old_y != m_yScrollPosition) {
 556             m_targetWindow->SetScrollPos( wxVERTICAL, m_yScrollPosition, TRUE );
 557             m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
 558         }
 559     }
 560
 561 #ifdef __WXMAC__
 562     m_targetWindow->MacUpdateImmediately();
 563 #endif
 564 }
 565
 566 void wxGenericScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
 567 {
 568     m_xScrollingEnabled = x_scroll;
 569     m_yScrollingEnabled = y_scroll;
 570 }
 571
 572 void wxGenericScrolledWindow::GetVirtualSize (int *x, int *y) const
 573 {
 574     if ( x )
 575         *x = m_xScrollPixelsPerLine * m_xScrollLines;
 576     if ( y )
 577         *y = m_yScrollPixelsPerLine * m_yScrollLines;
 578 }
 579
 580 // Where the current view starts from
 581 void wxGenericScrolledWindow::GetViewStart (int *x, int *y) const
 582 {
 583     if ( x )
 584         *x = m_xScrollPosition;
 585     if ( y )
 586         *y = m_yScrollPosition;
 587 }
 588
 589 void wxGenericScrolledWindow::CalcScrolledPosition(int x, int y, int *xx, int *yy) const
 590 {
 591     if ( xx )
 592         *xx = x - m_xScrollPosition * m_xScrollPixelsPerLine;
 593     if ( yy )
 594         *yy = y - m_yScrollPosition * m_yScrollPixelsPerLine;
 595 }
 596
 597 void wxGenericScrolledWindow::CalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
 598 {
 599     if ( xx )
 600         *xx = x + m_xScrollPosition * m_xScrollPixelsPerLine;
 601     if ( yy )
 602         *yy = y + m_yScrollPosition * m_yScrollPixelsPerLine;
 603 }
 604
 605 // ----------------------------------------------------------------------------
 606 // event handlers
 607 // ----------------------------------------------------------------------------
 608
 609 // Default OnSize resets scrollbars, if any
 610 void wxGenericScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 611 {
 612 #if wxUSE_CONSTRAINTS
 613     if (GetAutoLayout())
 614         Layout();
 615 #endif
 616
 617     AdjustScrollbars();
 618 }
 619
 620 // This calls OnDraw, having adjusted the origin according to the current
 621 // scroll position
 622 void wxGenericScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 623 {
 624     wxPaintDC dc(this);
 625     PrepareDC(dc);
 626
 627     OnDraw(dc);
 628 }
 629
 630 // kbd handling: notice that we use OnChar() and not OnKeyDown() for
 631 // compatibility here - if we used OnKeyDown(), the programs which process
 632 // arrows themselves in their OnChar() would never get the message and like
 633 // this they always have the priority
 634 void wxGenericScrolledWindow::OnChar(wxKeyEvent& event)
 635 {
 636     int stx, sty,       // view origin
 637         szx, szy,       // view size (total)
 638         clix, cliy;     // view size (on screen)
 639
 640     ViewStart(&stx, &sty);
 641     GetClientSize(&clix, &cliy);
 642     GetVirtualSize(&szx, &szy);
 643
 644     if( m_xScrollPixelsPerLine )
 645     {
 646         clix /= m_xScrollPixelsPerLine;
 647         szx /= m_xScrollPixelsPerLine;
 648     }
 649     else
 650     {
 651         clix = 0;
 652         szx = -1;
 653     }
 654     if( m_yScrollPixelsPerLine )
 655     {
 656         cliy /= m_yScrollPixelsPerLine;
 657         szy /= m_yScrollPixelsPerLine;
 658     }
 659     else
 660     {
 661         cliy = 0;
 662         szy = -1;
 663     }
 664
 665     int dsty;
 666     switch ( event.KeyCode() )
 667     {
 668         case WXK_PAGEUP:
 669         case WXK_PRIOR:
 670             dsty = sty - (5 * cliy / 6);
 671             Scroll(-1, (dsty == -1) ? 0 : dsty);
 672             break;
 673
 674         case WXK_PAGEDOWN:
 675         case WXK_NEXT:
 676             Scroll(-1, sty + (5 * cliy / 6));
 677             break;
 678
 679         case WXK_HOME:
 680             Scroll(0, event.ControlDown() ? 0 : -1);
 681             break;
 682
 683         case WXK_END:
 684             Scroll(szx - clix, event.ControlDown() ? szy - cliy : -1);
 685             break;
 686
 687         case WXK_UP:
 688             Scroll(-1, sty - 1);
 689             break;
 690
 691         case WXK_DOWN:
 692             Scroll(-1, sty + 1);
 693             break;
 694
 695         case WXK_LEFT:
 696             Scroll(stx - 1, -1);
 697             break;
 698
 699         case WXK_RIGHT:
 700             Scroll(stx + 1, -1);
 701             break;
 702
 703         default:
 704             // not for us
 705             event.Skip();
 706     }
 707 }
 708
 709
 710 void wxGenericScrolledWindow::OnMouseWheel(wxMouseEvent& event)
 711 {
 712     int lines;
 713     int vsx, vsy;
 714
 715     m_wheelRotation += event.GetWheelRotation();
 716     lines = m_wheelRotation / event.GetWheelDelta();
 717     m_wheelRotation -= lines * event.GetWheelDelta();
 718
 719     if (lines != 0) {
 720         lines *= event.GetLinesPerAction();
 721         GetViewStart(&vsx, &vsy);
 722         Scroll(-1, vsy - lines);
 723     }
 724 }
 725
 726
 727
 728