src/gtk1/scrolwin.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        gtk/scrolwin.cpp
   3 // Purpose:     wxScrolledWindow 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 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #include "wx/utils.h"
  32 #include "wx/dcclient.h"
  33
  34 #include "wx/scrolwin.h"
  35 #include "wx/panel.h"
  36 #include "wx/sizer.h"
  37
  38 #include "wx/gtk/private.h"
  39 #include "wx/gtk/win_gtk.h"
  40
  41 // ----------------------------------------------------------------------------
  42 // event tables
  43 // ----------------------------------------------------------------------------
  44
  45 BEGIN_EVENT_TABLE(wxScrolledWindow, wxPanel)
  46     EVT_SCROLLWIN(wxScrolledWindow::OnScroll)
  47     EVT_SIZE(wxScrolledWindow::OnSize)
  48     EVT_PAINT(wxScrolledWindow::OnPaint)
  49     EVT_CHAR(wxScrolledWindow::OnChar)
  50 END_EVENT_TABLE()
  51
  52 IMPLEMENT_DYNAMIC_CLASS(wxScrolledWindow, wxPanel)
  53
  54 // ============================================================================
  55 // implementation
  56 // ============================================================================
  57
  58 //-----------------------------------------------------------------------------
  59 // data
  60 //-----------------------------------------------------------------------------
  61
  62 extern bool       g_blockEventsOnDrag;
  63 extern bool       g_blockEventsOnScroll;
  64
  65 //-----------------------------------------------------------------------------
  66 // idle system
  67 //-----------------------------------------------------------------------------
  68
  69 extern void wxapp_install_idle_handler();
  70 extern bool g_isIdle;
  71
  72 //-----------------------------------------------------------------------------
  73 // "value_changed" from m_vAdjust
  74 //-----------------------------------------------------------------------------
  75
  76 static void gtk_scrolled_window_vscroll_callback( GtkAdjustment *adjust,
  77                                                   SCROLLBAR_CBACK_ARG
  78                                                   wxScrolledWindow *win )
  79 {
  80     if (g_isIdle)
  81         wxapp_install_idle_handler();
  82
  83     if (g_blockEventsOnDrag) return;
  84
  85     if (!win->m_hasVMT) return;
  86
  87     win->GtkVScroll( adjust->value,
  88             GET_SCROLL_TYPE(GTK_SCROLLED_WINDOW(win->m_widget)->vscrollbar) );
  89 }
  90
  91 //-----------------------------------------------------------------------------
  92 // "value_changed" from m_hAdjust
  93 //-----------------------------------------------------------------------------
  94
  95 static void gtk_scrolled_window_hscroll_callback( GtkAdjustment *adjust,
  96                                                   SCROLLBAR_CBACK_ARG
  97                                                   wxScrolledWindow *win )
  98 {
  99     if (g_isIdle)
 100         wxapp_install_idle_handler();
 101
 102     if (g_blockEventsOnDrag) return;
 103     if (!win->m_hasVMT) return;
 104
 105     win->GtkHScroll( adjust->value,
 106             GET_SCROLL_TYPE(GTK_SCROLLED_WINDOW(win->m_widget)->hscrollbar) );
 107 }
 108
 109 //-----------------------------------------------------------------------------
 110 // "button_press_event" from scrollbar
 111 //-----------------------------------------------------------------------------
 112
 113 static gint gtk_scrollbar_button_press_callback( GtkRange *widget,
 114                                                  GdkEventButton *gdk_event,
 115                                                  wxWindowGTK *win)
 116 {
 117     if (g_isIdle)
 118         wxapp_install_idle_handler();
 119
 120     g_blockEventsOnScroll = TRUE;
 121
 122     // FIXME: there is no slider field any more, what was meant here?
 123 #ifndef __WXGTK20__
 124     win->m_isScrolling = (gdk_event->window == widget->slider);
 125 #endif
 126
 127     return FALSE;
 128 }
 129
 130 //-----------------------------------------------------------------------------
 131 // "button_release_event" from scrollbar
 132 //-----------------------------------------------------------------------------
 133
 134 static gint gtk_scrollbar_button_release_callback( GtkRange *widget,
 135                                                    GdkEventButton *WXUNUSED(gdk_event),
 136                                                    wxWindowGTK *win)
 137 {
 138 //  don't test here as we can release the mouse while being over
 139 //  a different window than the slider
 140 //
 141 //    if (gdk_event->window != widget->slider) return FALSE;
 142
 143     g_blockEventsOnScroll = FALSE;
 144
 145     if (win->m_isScrolling)
 146     {
 147         wxEventType command = wxEVT_SCROLLWIN_THUMBRELEASE;
 148         int value = -1;
 149         int dir = -1;
 150
 151         GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(win->m_widget);
 152         if (widget == GTK_RANGE(scrolledWindow->hscrollbar))
 153         {
 154             value = (int)(win->m_hAdjust->value+0.5);
 155             dir = wxHORIZONTAL;
 156         }
 157         if (widget == GTK_RANGE(scrolledWindow->vscrollbar))
 158         {
 159             value = (int)(win->m_vAdjust->value+0.5);
 160             dir = wxVERTICAL;
 161         }
 162
 163         wxScrollWinEvent event( command, value, dir );
 164         event.SetEventObject( win );
 165         win->GetEventHandler()->ProcessEvent( event );
 166     }
 167
 168     win->m_isScrolling = FALSE;
 169
 170     return FALSE;
 171 }
 172
 173 //-----------------------------------------------------------------------------
 174 // InsertChild for wxScrolledWindow
 175 //-----------------------------------------------------------------------------
 176
 177 static void wxInsertChildInScrolledWindow( wxWindow* parent, wxWindow* child )
 178 {
 179     // The window might have been scrolled already, do we
 180     // have to adapt the position.
 181     GtkPizza *pizza = GTK_PIZZA(parent->m_wxwindow);
 182     child->m_x += pizza->xoffset;
 183     child->m_y += pizza->yoffset;
 184
 185     gtk_pizza_put( GTK_PIZZA(parent->m_wxwindow),
 186                      GTK_WIDGET(child->m_widget),
 187                      child->m_x,
 188                      child->m_y,
 189                      child->m_width,
 190                      child->m_height );
 191 }
 192
 193 // ----------------------------------------------------------------------------
 194 // wxScrolledWindow creation
 195 // ----------------------------------------------------------------------------
 196
 197 void wxScrolledWindow::Init()
 198 {
 199     m_xScrollPixelsPerLine = 0;
 200     m_yScrollPixelsPerLine = 0;
 201     m_xScrollingEnabled = TRUE;
 202     m_yScrollingEnabled = TRUE;
 203     m_xScrollPosition = 0;
 204     m_yScrollPosition = 0;
 205     m_xScrollLines = 0;
 206     m_yScrollLines = 0;
 207     m_xScrollLinesPerPage = 0;
 208     m_yScrollLinesPerPage = 0;
 209     m_targetWindow = (wxWindow*) NULL;
 210     m_scaleX = 1.0;
 211     m_scaleY = 1.0;
 212     m_hasScrolling = TRUE;
 213 }
 214
 215 bool wxScrolledWindow::Create(wxWindow *parent,
 216                               wxWindowID id,
 217                               const wxPoint& pos,
 218                               const wxSize& size,
 219                               long style,
 220                               const wxString& name)
 221 {
 222     Init();
 223
 224     if (!PreCreation( parent, pos, size ) ||
 225         !CreateBase( parent, id, pos, size, style, wxDefaultValidator, name ))
 226     {
 227         wxFAIL_MSG( wxT("wxWindow creation failed") );
 228         return FALSE;
 229     }
 230
 231     m_insertCallback = wxInsertChildInScrolledWindow;
 232
 233     m_targetWindow = this;
 234
 235     m_widget = gtk_scrolled_window_new( (GtkAdjustment *) NULL, (GtkAdjustment *) NULL );
 236     GTK_WIDGET_UNSET_FLAGS( m_widget, GTK_CAN_FOCUS );
 237
 238     GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(m_widget);
 239
 240     GtkScrolledWindowClass *scroll_class = GTK_SCROLLED_WINDOW_CLASS( GTK_OBJECT_GET_CLASS(m_widget) );
 241     scroll_class->scrollbar_spacing = 0;
 242
 243     gtk_scrolled_window_set_policy( scrolledWindow, GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC );
 244
 245     m_hAdjust = gtk_range_get_adjustment( GTK_RANGE(scrolledWindow->hscrollbar) );
 246     m_vAdjust = gtk_range_get_adjustment( GTK_RANGE(scrolledWindow->vscrollbar) );
 247
 248     m_wxwindow = gtk_pizza_new();
 249
 250     gtk_container_add( GTK_CONTAINER(m_widget), m_wxwindow );
 251
 252     GtkPizza *pizza = GTK_PIZZA(m_wxwindow);
 253
 254     if (HasFlag(wxRAISED_BORDER))
 255     {
 256         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_OUT );
 257     }
 258     else if (HasFlag(wxSUNKEN_BORDER))
 259     {
 260         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_IN );
 261     }
 262     else if (HasFlag(wxSIMPLE_BORDER))
 263     {
 264         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_THIN );
 265     }
 266     else
 267     {
 268         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_NONE );
 269     }
 270
 271     GTK_WIDGET_SET_FLAGS( m_wxwindow, GTK_CAN_FOCUS );
 272     m_acceptsFocus = TRUE;
 273
 274     // I _really_ don't want scrollbars in the beginning
 275     m_vAdjust->lower = 0.0;
 276     m_vAdjust->upper = 1.0;
 277     m_vAdjust->value = 0.0;
 278     m_vAdjust->step_increment = 1.0;
 279     m_vAdjust->page_increment = 1.0;
 280     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 281     m_hAdjust->lower = 0.0;
 282     m_hAdjust->upper = 1.0;
 283     m_hAdjust->value = 0.0;
 284     m_hAdjust->step_increment = 1.0;
 285     m_hAdjust->page_increment = 1.0;
 286     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 287
 288     // Handlers for new scrollbar values
 289     GtkVConnectEvent();
 290     GtkHConnectEvent();
 291
 292     // these handlers block mouse events to any window during scrolling such as
 293     // motion events and prevent GTK and wxWindows from fighting over where the
 294     // slider should be
 295
 296     gtk_signal_connect( GTK_OBJECT(scrolledWindow->vscrollbar), "button_press_event",
 297           (GtkSignalFunc)gtk_scrollbar_button_press_callback, (gpointer) this );
 298
 299     gtk_signal_connect( GTK_OBJECT(scrolledWindow->hscrollbar), "button_press_event",
 300           (GtkSignalFunc)gtk_scrollbar_button_press_callback, (gpointer) this );
 301
 302     gtk_signal_connect( GTK_OBJECT(scrolledWindow->vscrollbar), "button_release_event",
 303           (GtkSignalFunc)gtk_scrollbar_button_release_callback, (gpointer) this );
 304
 305     gtk_signal_connect( GTK_OBJECT(scrolledWindow->hscrollbar), "button_release_event",
 306           (GtkSignalFunc)gtk_scrollbar_button_release_callback, (gpointer) this );
 307
 308     gtk_widget_show( m_wxwindow );
 309
 310     if (m_parent)
 311         m_parent->DoAddChild( this );
 312
 313     m_focusWidget = m_wxwindow;
 314
 315     PostCreation();
 316
 317     Show( TRUE );
 318
 319     return TRUE;
 320 }
 321
 322 // ----------------------------------------------------------------------------
 323 // setting scrolling parameters
 324 // ----------------------------------------------------------------------------
 325
 326 /*
 327  * pixelsPerUnitX/pixelsPerUnitY: number of pixels per unit (e.g. pixels per text line)
 328  * noUnitsX/noUnitsY:        : no. units per scrollbar
 329  */
 330 void wxScrolledWindow::SetScrollbars (int pixelsPerUnitX, int pixelsPerUnitY,
 331                int noUnitsX, int noUnitsY,
 332                int xPos, int yPos, bool noRefresh )
 333 {
 334     int old_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 335     int old_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 336
 337     m_xScrollPixelsPerLine = pixelsPerUnitX;
 338     m_yScrollPixelsPerLine = pixelsPerUnitY;
 339     m_xScrollLines = noUnitsX;
 340     m_yScrollLines = noUnitsY;
 341     m_xScrollPosition = xPos;
 342     m_yScrollPosition = yPos;
 343
 344     m_hAdjust->lower = 0.0;
 345     m_hAdjust->upper = noUnitsX;
 346     m_hAdjust->value = xPos;
 347     m_hAdjust->step_increment = 1.0;
 348     m_hAdjust->page_increment = 2.0;
 349
 350     m_vAdjust->lower = 0.0;
 351     m_vAdjust->upper = noUnitsY;
 352     m_vAdjust->value = yPos;
 353     m_vAdjust->step_increment = 1.0;
 354     m_vAdjust->page_increment = 2.0;
 355
 356     AdjustScrollbars();
 357
 358     if (!noRefresh)
 359     {
 360         int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 361         int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 362
 363         m_targetWindow->ScrollWindow( old_x-new_x, old_y-new_y );
 364     }
 365 }
 366
 367 void wxScrolledWindow::AdjustScrollbars()
 368 {
 369     int w, h;
 370     m_targetWindow->GetClientSize( &w, &h );
 371
 372     if (m_xScrollPixelsPerLine == 0)
 373         m_hAdjust->page_size = 1.0;
 374     else
 375         m_hAdjust->page_size = (w / m_xScrollPixelsPerLine);
 376
 377     if (m_yScrollPixelsPerLine == 0)
 378         m_vAdjust->page_size = 1.0;
 379     else
 380         m_vAdjust->page_size = (h / m_yScrollPixelsPerLine);
 381
 382     m_xScrollLinesPerPage = (int)(m_hAdjust->page_size + 0.5);
 383     m_yScrollLinesPerPage = (int)(m_vAdjust->page_size + 0.5);
 384
 385     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 386     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 387 }
 388
 389 // ----------------------------------------------------------------------------
 390 // target window handling
 391 // ----------------------------------------------------------------------------
 392
 393 void wxScrolledWindow::SetTargetWindow( wxWindow *target, bool WXUNUSED(pushEventHandler) )
 394 {
 395     wxASSERT_MSG( target, wxT("target window must not be NULL") );
 396     m_targetWindow = target;
 397 }
 398
 399 wxWindow *wxScrolledWindow::GetTargetWindow()
 400 {
 401     return m_targetWindow;
 402 }
 403
 404 // Override this function if you don't want to have wxScrolledWindow
 405 // automatically change the origin according to the scroll position.
 406 void wxScrolledWindow::PrepareDC(wxDC& dc)
 407 {
 408     dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,
 409                         -m_yScrollPosition * m_yScrollPixelsPerLine );
 410 }
 411
 412 void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 413 {
 414     if ( x_unit )
 415         *x_unit = m_xScrollPixelsPerLine;
 416     if ( y_unit )
 417         *y_unit = m_yScrollPixelsPerLine;
 418 }
 419
 420 int wxScrolledWindow::GetScrollPageSize(int orient) const
 421 {
 422     if ( orient == wxHORIZONTAL )
 423         return m_xScrollLinesPerPage;
 424     else
 425         return m_yScrollLinesPerPage;
 426 }
 427
 428 void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
 429 {
 430     if ( orient == wxHORIZONTAL )
 431         m_xScrollLinesPerPage = pageSize;
 432     else
 433         m_yScrollLinesPerPage = pageSize;
 434 }
 435
 436 void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)
 437 {
 438     int orient = event.GetOrientation();
 439
 440     int nScrollInc = CalcScrollInc(event);
 441     if (nScrollInc == 0) return;
 442
 443     if (orient == wxHORIZONTAL)
 444     {
 445         int newPos = m_xScrollPosition + nScrollInc;
 446         SetScrollPos(wxHORIZONTAL, newPos, TRUE );
 447     }
 448     else
 449     {
 450         int newPos = m_yScrollPosition + nScrollInc;
 451         SetScrollPos(wxVERTICAL, newPos, TRUE );
 452     }
 453
 454     if (orient == wxHORIZONTAL)
 455     {
 456         m_xScrollPosition += nScrollInc;
 457     }
 458     else
 459     {
 460         m_yScrollPosition += nScrollInc;
 461     }
 462
 463     if (orient == wxHORIZONTAL)
 464     {
 465        if (m_xScrollingEnabled)
 466             m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
 467        else
 468             m_targetWindow->Refresh();
 469     }
 470     else
 471     {
 472         if (m_yScrollingEnabled)
 473             m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
 474         else
 475             m_targetWindow->Refresh();
 476     }
 477 }
 478
 479 void wxScrolledWindow::Scroll( int x_pos, int y_pos )
 480 {
 481     if (!m_targetWindow)
 482         return;
 483
 484     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
 485         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
 486
 487     if ((x_pos != -1) && (m_xScrollPixelsPerLine))
 488     {
 489         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 490         if (max < 0) max = 0;
 491         if (x_pos > max) x_pos = max;
 492         if (x_pos < 0) x_pos = 0;
 493
 494         int old_x = m_xScrollPosition;
 495         m_xScrollPosition = x_pos;
 496         m_hAdjust->value = x_pos;
 497
 498         m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
 499
 500         // Just update the scrollbar, don't send any wxWindows event
 501         GtkHDisconnectEvent();
 502         gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 503         GtkHConnectEvent();
 504     }
 505
 506     if ((y_pos != -1) && (m_yScrollPixelsPerLine))
 507     {
 508         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 509         if (max < 0) max = 0;
 510         if (y_pos > max) y_pos = max;
 511         if (y_pos < 0) y_pos = 0;
 512
 513         int old_y = m_yScrollPosition;
 514         m_yScrollPosition = y_pos;
 515         m_vAdjust->value = y_pos;
 516
 517         m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
 518
 519         // Just update the scrollbar, don't send any wxWindows event
 520         GtkVDisconnectEvent();
 521         gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 522         GtkVConnectEvent();
 523     }
 524 }
 525
 526 // TODO: [VH]Scroll functions should be combined
 527
 528 void wxScrolledWindow::GtkVScroll( float value, unsigned int scroll_type )
 529 {
 530     if (!m_targetWindow)
 531         return;
 532
 533     if (m_yScrollPixelsPerLine == 0)
 534         return;
 535
 536     int y_pos = (int)(value+0.5);
 537
 538     if (y_pos == m_yScrollPosition)
 539         return;
 540
 541     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 542
 543     wxScrollWinEvent event( command, y_pos, wxVERTICAL );
 544     event.SetEventObject( this );
 545     GetEventHandler()->ProcessEvent( event );
 546 }
 547
 548 void wxScrolledWindow::GtkHScroll( float value, unsigned int scroll_type )
 549 {
 550     if (!m_targetWindow)
 551         return;
 552
 553     if (m_xScrollPixelsPerLine == 0)
 554         return;
 555
 556     int x_pos = (int)(value+0.5);
 557
 558     if (x_pos == m_xScrollPosition)
 559         return;
 560
 561     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 562
 563     wxScrollWinEvent event( command, x_pos, wxHORIZONTAL );
 564     event.SetEventObject( this );
 565     GetEventHandler()->ProcessEvent( event );
 566 }
 567
 568 void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
 569 {
 570     m_xScrollingEnabled = x_scroll;
 571     m_yScrollingEnabled = y_scroll;
 572 }
 573
 574 void wxScrolledWindow::GetVirtualSize (int *x, int *y) const
 575 {
 576     if ( x )
 577         *x = m_xScrollPixelsPerLine * m_xScrollLines;
 578     if ( y )
 579         *y = m_yScrollPixelsPerLine * m_yScrollLines;
 580 }
 581
 582 // Where the current view starts from
 583 void wxScrolledWindow::GetViewStart (int *x, int *y) const
 584 {
 585     if ( x )
 586         *x = m_xScrollPosition;
 587     if ( y )
 588         *y = m_yScrollPosition;
 589 }
 590
 591 void wxScrolledWindow::DoCalcScrolledPosition(int x, int y, int *xx, int *yy) const
 592 {
 593     if ( xx )
 594         *xx = x - m_xScrollPosition * m_xScrollPixelsPerLine;
 595     if ( yy )
 596         *yy = y - m_yScrollPosition * m_yScrollPixelsPerLine;
 597 }
 598
 599 void wxScrolledWindow::DoCalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
 600 {
 601     if ( xx )
 602         *xx = x + m_xScrollPosition * m_xScrollPixelsPerLine;
 603     if ( yy )
 604         *yy = y + m_yScrollPosition * m_yScrollPixelsPerLine;
 605 }
 606
 607 int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
 608 {
 609     int pos = event.GetPosition();
 610     int orient = event.GetOrientation();
 611
 612     int nScrollInc = 0;
 613     if (event.GetEventType() == wxEVT_SCROLLWIN_TOP)
 614     {
 615             if (orient == wxHORIZONTAL)
 616                 nScrollInc = - m_xScrollPosition;
 617             else
 618                 nScrollInc = - m_yScrollPosition;
 619     } else
 620     if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
 621     {
 622             if (orient == wxHORIZONTAL)
 623                 nScrollInc = m_xScrollLines - m_xScrollPosition;
 624             else
 625                 nScrollInc = m_yScrollLines - m_yScrollPosition;
 626     } else
 627     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
 628     {
 629             nScrollInc = -1;
 630     } else
 631     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN)
 632     {
 633             nScrollInc = 1;
 634     } else
 635     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEUP)
 636     {
 637             if (orient == wxHORIZONTAL)
 638                 nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
 639             else
 640                 nScrollInc = -GetScrollPageSize(wxVERTICAL);
 641     } else
 642     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEDOWN)
 643     {
 644             if (orient == wxHORIZONTAL)
 645                 nScrollInc = GetScrollPageSize(wxHORIZONTAL);
 646             else
 647                 nScrollInc = GetScrollPageSize(wxVERTICAL);
 648     } else
 649     if ((event.GetEventType() == wxEVT_SCROLLWIN_THUMBTRACK) ||
 650         (event.GetEventType() == wxEVT_SCROLLWIN_THUMBRELEASE))
 651     {
 652             if (orient == wxHORIZONTAL)
 653                 nScrollInc = pos - m_xScrollPosition;
 654             else
 655                 nScrollInc = pos - m_yScrollPosition;
 656     }
 657
 658     if (orient == wxHORIZONTAL)
 659     {
 660         if (m_xScrollPixelsPerLine > 0)
 661         {
 662             int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 663             if (max < 0) max = 0;
 664
 665             if ( (m_xScrollPosition + nScrollInc) < 0 )
 666                 nScrollInc = -m_xScrollPosition; // As -ve as we can go
 667             else if ( (m_xScrollPosition + nScrollInc) > max )
 668                 nScrollInc = max - m_xScrollPosition; // As +ve as we can go
 669         }
 670         else
 671             m_targetWindow->Refresh();
 672     }
 673     else
 674     {
 675         if (m_yScrollPixelsPerLine > 0)
 676         {
 677             int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 678             if (max < 0) max = 0;
 679
 680             if ( (m_yScrollPosition + nScrollInc) < 0 )
 681                 nScrollInc = -m_yScrollPosition; // As -ve as we can go
 682             else if ( (m_yScrollPosition + nScrollInc) > max )
 683                 nScrollInc = max - m_yScrollPosition; // As +ve as we can go
 684         }
 685         else
 686             m_targetWindow->Refresh();
 687     }
 688
 689     return nScrollInc;
 690 }
 691
 692 void wxScrolledWindow::SetScrollPos( int orient, int pos, bool refresh )
 693 {
 694     wxCHECK_RET( m_widget != NULL, wxT("invalid window") );
 695
 696     wxCHECK_RET( m_wxwindow != NULL, wxT("window needs client area for scrolling") );
 697
 698     if (orient == wxHORIZONTAL)
 699     {
 700         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 701         if (max < 0) max = 0;
 702
 703         if (pos > max) pos = 0;
 704         if (pos < 0) pos = 0;
 705
 706         if (pos == (int)(m_hAdjust->value+0.5)) return;
 707         m_hAdjust->value = pos;
 708     }
 709     else
 710     {
 711         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 712         if (max < 0) max = 0;
 713
 714         if (pos > max) pos = 0;
 715         if (pos < 0) pos = 0;
 716
 717         if (pos == (int)(m_vAdjust->value+0.5)) return;
 718         m_vAdjust->value = pos;
 719     }
 720
 721     if (m_wxwindow->window)
 722     {
 723         if (orient == wxHORIZONTAL)
 724         {
 725             // Just update the scrollbar, don't send any wxWindows event
 726             GtkHDisconnectEvent();
 727             gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 728             GtkHConnectEvent();
 729         }
 730         else
 731         {
 732             // Just update the scrollbar, don't send any wxWindows event
 733             GtkVDisconnectEvent();
 734             gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 735             GtkVConnectEvent();
 736         }
 737     }
 738 }
 739
 740 void wxScrolledWindow::GtkVConnectEvent()
 741 {
 742     gtk_signal_connect( GTK_OBJECT(m_vAdjust), "value_changed",
 743           (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 744 }
 745
 746 void wxScrolledWindow::GtkHConnectEvent()
 747 {
 748     gtk_signal_connect( GTK_OBJECT(m_hAdjust), "value_changed",
 749           (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 750 }
 751
 752 void wxScrolledWindow::GtkHDisconnectEvent()
 753 {
 754     gtk_signal_disconnect_by_func( GTK_OBJECT(m_hAdjust),
 755         (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 756 }
 757
 758 void wxScrolledWindow::GtkVDisconnectEvent()
 759 {
 760     gtk_signal_disconnect_by_func( GTK_OBJECT(m_vAdjust),
 761         (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 762 }
 763
 764
 765 bool wxScrolledWindow::Layout()
 766 {
 767     if (GetSizer())
 768     {
 769         // Take into account the virtual size and scrolled position of the window
 770         int x, y, w, h;
 771         CalcScrolledPosition(0,0, &x,&y);
 772         GetVirtualSize(&w, &h);
 773         GetSizer()->SetDimension(x, y, w, h);
 774         return TRUE;
 775     }
 776     else
 777         return wxPanel::Layout();  // fall back to default for LayoutConstraints
 778 }
 779
 780 // ----------------------------------------------------------------------------
 781 // event handlers
 782 // ----------------------------------------------------------------------------
 783
 784 // Default OnSize resets scrollbars, if any
 785 void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 786 {
 787 #if wxUSE_CONSTRAINTS
 788     if (GetAutoLayout())
 789         Layout();
 790 #endif
 791
 792     AdjustScrollbars();
 793 }
 794
 795 // This calls OnDraw, having adjusted the origin according to the current
 796 // scroll position
 797 void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 798 {
 799     wxPaintDC dc(this);
 800     PrepareDC(dc);
 801
 802     OnDraw(dc);
 803 }
 804
 805 // kbd handling: notice that we use OnChar() and not OnKeyDown() for
 806 // compatibility here - if we used OnKeyDown(), the programs which process
 807 // arrows themselves in their OnChar() would never get the message and like
 808 // this they always have the priority
 809 void wxScrolledWindow::OnChar(wxKeyEvent& event)
 810 {
 811     int stx, sty,       // view origin
 812         szx, szy,       // view size (total)
 813         clix, cliy;     // view size (on screen)
 814
 815     ViewStart(&stx, &sty);
 816     GetClientSize(&clix, &cliy);
 817     GetVirtualSize(&szx, &szy);
 818
 819     if( m_xScrollPixelsPerLine )
 820     {
 821         clix /= m_xScrollPixelsPerLine;
 822         szx /= m_xScrollPixelsPerLine;
 823     }
 824     else
 825     {
 826         clix = 0;
 827         szx = -1;
 828     }
 829     if( m_yScrollPixelsPerLine )
 830     {
 831         cliy /= m_yScrollPixelsPerLine;
 832         szy /= m_yScrollPixelsPerLine;
 833     }
 834     else
 835     {
 836         cliy = 0;
 837         szy = -1;
 838     }
 839
 840     int xScrollOld = GetScrollPos(wxHORIZONTAL),
 841         yScrollOld = GetScrollPos(wxVERTICAL);
 842
 843     int dsty;
 844     switch ( event.KeyCode() )
 845     {
 846         case WXK_PAGEUP:
 847         case WXK_PRIOR:
 848             dsty = sty - (5 * cliy / 6);
 849             Scroll(-1, (dsty == -1) ? 0 : dsty);
 850             break;
 851
 852         case WXK_PAGEDOWN:
 853         case WXK_NEXT:
 854             Scroll(-1, sty + (5 * cliy / 6));
 855             break;
 856
 857         case WXK_HOME:
 858             Scroll(0, event.ControlDown() ? 0 : -1);
 859             break;
 860
 861         case WXK_END:
 862             Scroll(szx - clix, event.ControlDown() ? szy - cliy : -1);
 863             break;
 864
 865         case WXK_UP:
 866             Scroll(-1, sty - 1);
 867             break;
 868
 869         case WXK_DOWN:
 870             Scroll(-1, sty + 1);
 871             break;
 872
 873         case WXK_LEFT:
 874             Scroll(stx - 1, -1);
 875             break;
 876
 877         case WXK_RIGHT:
 878             Scroll(stx + 1, -1);
 879             break;
 880
 881         default:
 882             // not for us
 883             event.Skip();
 884             return;
 885     }
 886
 887     int xScroll = GetScrollPos(wxHORIZONTAL);
 888     if ( xScroll != xScrollOld )
 889     {
 890         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, xScroll,
 891                                wxHORIZONTAL);
 892         event.SetEventObject(this);
 893         GetEventHandler()->ProcessEvent(event);
 894     }
 895
 896     int yScroll = GetScrollPos(wxVERTICAL);
 897     if ( yScroll != yScrollOld )
 898     {
 899         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, yScroll,
 900                                wxVERTICAL);
 901         event.SetEventObject(this);
 902         GetEventHandler()->ProcessEvent(event);
 903     }
 904 }
 905