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