src/gtk/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 = 2.0;
 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 = 2.0;
 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     {
 374         m_hAdjust->upper = 1.0;
 375         m_hAdjust->page_size = 1.0;
 376     }
 377     else
 378     {
 379         m_hAdjust->page_size = (w / m_xScrollPixelsPerLine);
 380
 381         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 382         if (max < 0) max = 0;
 383
 384         int x_pos = m_xScrollPosition;
 385         if (x_pos > max) x_pos = max;
 386         if (x_pos < 0) x_pos = 0;
 387
 388         int old_x = m_xScrollPosition;
 389         m_xScrollPosition = x_pos;
 390         m_hAdjust->value = x_pos;
 391
 392         if (x_pos != old_x)
 393             m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
 394     }
 395
 396     if (m_yScrollPixelsPerLine == 0)
 397     {
 398         m_vAdjust->upper = 1.0;
 399         m_vAdjust->page_size = 1.0;
 400     }
 401     else
 402     {
 403         m_vAdjust->page_size = (h / m_yScrollPixelsPerLine);
 404
 405         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 406         if (max < 0) max = 0;
 407
 408         int y_pos = m_yScrollPosition;
 409         if (y_pos > max) y_pos = max;
 410         if (y_pos < 0) y_pos = 0;
 411
 412         int old_y = m_yScrollPosition;
 413         m_yScrollPosition = y_pos;
 414         m_vAdjust->value = y_pos;
 415
 416         if (y_pos != old_y)
 417             m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
 418     }
 419
 420     m_xScrollLinesPerPage = (int)(m_hAdjust->page_size + 0.5);
 421     m_yScrollLinesPerPage = (int)(m_vAdjust->page_size + 0.5);
 422
 423     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 424     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 425 }
 426
 427 // ----------------------------------------------------------------------------
 428 // target window handling
 429 // ----------------------------------------------------------------------------
 430
 431 void wxScrolledWindow::SetTargetWindow( wxWindow *target, bool WXUNUSED(pushEventHandler) )
 432 {
 433     wxASSERT_MSG( target, wxT("target window must not be NULL") );
 434     m_targetWindow = target;
 435 }
 436
 437 wxWindow *wxScrolledWindow::GetTargetWindow()
 438 {
 439     return m_targetWindow;
 440 }
 441
 442 // Override this function if you don't want to have wxScrolledWindow
 443 // automatically change the origin according to the scroll position.
 444 void wxScrolledWindow::PrepareDC(wxDC& dc)
 445 {
 446     dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,
 447                         -m_yScrollPosition * m_yScrollPixelsPerLine );
 448 }
 449
 450 void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 451 {
 452     if ( x_unit )
 453         *x_unit = m_xScrollPixelsPerLine;
 454     if ( y_unit )
 455         *y_unit = m_yScrollPixelsPerLine;
 456 }
 457
 458 int wxScrolledWindow::GetScrollPageSize(int orient) const
 459 {
 460     if ( orient == wxHORIZONTAL )
 461         return m_xScrollLinesPerPage;
 462     else
 463         return m_yScrollLinesPerPage;
 464 }
 465
 466 void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
 467 {
 468     if ( orient == wxHORIZONTAL )
 469         m_xScrollLinesPerPage = pageSize;
 470     else
 471         m_yScrollLinesPerPage = pageSize;
 472 }
 473
 474 void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)
 475 {
 476     int orient = event.GetOrientation();
 477
 478     int nScrollInc = CalcScrollInc(event);
 479     if (nScrollInc == 0) return;
 480
 481     if (orient == wxHORIZONTAL)
 482     {
 483         int newPos = m_xScrollPosition + nScrollInc;
 484         SetScrollPos(wxHORIZONTAL, newPos, TRUE );
 485     }
 486     else
 487     {
 488         int newPos = m_yScrollPosition + nScrollInc;
 489         SetScrollPos(wxVERTICAL, newPos, TRUE );
 490     }
 491
 492     if (orient == wxHORIZONTAL)
 493     {
 494         m_xScrollPosition += nScrollInc;
 495     }
 496     else
 497     {
 498         m_yScrollPosition += nScrollInc;
 499     }
 500
 501     if (orient == wxHORIZONTAL)
 502     {
 503        if (m_xScrollingEnabled)
 504             m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
 505        else
 506             m_targetWindow->Refresh();
 507     }
 508     else
 509     {
 510         if (m_yScrollingEnabled)
 511             m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
 512         else
 513             m_targetWindow->Refresh();
 514     }
 515 }
 516
 517 void wxScrolledWindow::Scroll( int x_pos, int y_pos )
 518 {
 519     if (!m_targetWindow)
 520         return;
 521
 522     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
 523         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
 524
 525     if ((x_pos != -1) && (m_xScrollPixelsPerLine))
 526     {
 527         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 528         if (max < 0) max = 0;
 529         if (x_pos > max) x_pos = max;
 530         if (x_pos < 0) x_pos = 0;
 531
 532         int old_x = m_xScrollPosition;
 533         m_xScrollPosition = x_pos;
 534         m_hAdjust->value = x_pos;
 535
 536         m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
 537
 538         // Just update the scrollbar, don't send any wxWindows event
 539         GtkHDisconnectEvent();
 540         gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 541         GtkHConnectEvent();
 542     }
 543
 544     if ((y_pos != -1) && (m_yScrollPixelsPerLine))
 545     {
 546         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 547         if (max < 0) max = 0;
 548         if (y_pos > max) y_pos = max;
 549         if (y_pos < 0) y_pos = 0;
 550
 551         int old_y = m_yScrollPosition;
 552         m_yScrollPosition = y_pos;
 553         m_vAdjust->value = y_pos;
 554
 555         m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
 556
 557         // Just update the scrollbar, don't send any wxWindows event
 558         GtkVDisconnectEvent();
 559         gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 560         GtkVConnectEvent();
 561     }
 562 }
 563
 564 // TODO: [VH]Scroll functions should be combined
 565
 566 void wxScrolledWindow::GtkVScroll( float value, unsigned int scroll_type )
 567 {
 568     if (!m_targetWindow)
 569         return;
 570
 571     if (m_yScrollPixelsPerLine == 0)
 572         return;
 573
 574     int y_pos = (int)(value+0.5);
 575
 576     if (y_pos == m_yScrollPosition)
 577         return;
 578
 579     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 580
 581     wxScrollWinEvent event( command, y_pos, wxVERTICAL );
 582     event.SetEventObject( this );
 583     GetEventHandler()->ProcessEvent( event );
 584 }
 585
 586 void wxScrolledWindow::GtkHScroll( float value, unsigned int scroll_type )
 587 {
 588     if (!m_targetWindow)
 589         return;
 590
 591     if (m_xScrollPixelsPerLine == 0)
 592         return;
 593
 594     int x_pos = (int)(value+0.5);
 595
 596     if (x_pos == m_xScrollPosition)
 597         return;
 598
 599     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 600
 601     wxScrollWinEvent event( command, x_pos, wxHORIZONTAL );
 602     event.SetEventObject( this );
 603     GetEventHandler()->ProcessEvent( event );
 604 }
 605
 606 void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
 607 {
 608     m_xScrollingEnabled = x_scroll;
 609     m_yScrollingEnabled = y_scroll;
 610 }
 611
 612 void wxScrolledWindow::GetVirtualSize (int *x, int *y) const
 613 {
 614     wxSize sz(0, 0);
 615     if (m_targetWindow)
 616         sz = m_targetWindow->GetClientSize();
 617
 618     if ( x )
 619     {
 620         if (m_xScrollPixelsPerLine == 0)
 621             *x = sz.x;
 622         else
 623             *x = m_xScrollPixelsPerLine * m_xScrollLines;
 624     }
 625     if ( y )
 626     {
 627         if (m_yScrollPixelsPerLine == 0)
 628             *y = sz.y;
 629         else
 630             *y = m_yScrollPixelsPerLine * m_yScrollLines;
 631     }
 632 }
 633
 634 // Where the current view starts from
 635 void wxScrolledWindow::GetViewStart (int *x, int *y) const
 636 {
 637     if ( x )
 638         *x = m_xScrollPosition;
 639     if ( y )
 640         *y = m_yScrollPosition;
 641 }
 642
 643 void wxScrolledWindow::DoCalcScrolledPosition(int x, int y, int *xx, int *yy) const
 644 {
 645     if ( xx )
 646         *xx = x - m_xScrollPosition * m_xScrollPixelsPerLine;
 647     if ( yy )
 648         *yy = y - m_yScrollPosition * m_yScrollPixelsPerLine;
 649 }
 650
 651 void wxScrolledWindow::DoCalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
 652 {
 653     if ( xx )
 654         *xx = x + m_xScrollPosition * m_xScrollPixelsPerLine;
 655     if ( yy )
 656         *yy = y + m_yScrollPosition * m_yScrollPixelsPerLine;
 657 }
 658
 659 int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
 660 {
 661     int pos = event.GetPosition();
 662     int orient = event.GetOrientation();
 663
 664     int nScrollInc = 0;
 665     if (event.GetEventType() == wxEVT_SCROLLWIN_TOP)
 666     {
 667             if (orient == wxHORIZONTAL)
 668                 nScrollInc = - m_xScrollPosition;
 669             else
 670                 nScrollInc = - m_yScrollPosition;
 671     } else
 672     if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
 673     {
 674             if (orient == wxHORIZONTAL)
 675                 nScrollInc = m_xScrollLines - m_xScrollPosition;
 676             else
 677                 nScrollInc = m_yScrollLines - m_yScrollPosition;
 678     } else
 679     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
 680     {
 681             nScrollInc = -1;
 682     } else
 683     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN)
 684     {
 685             nScrollInc = 1;
 686     } else
 687     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEUP)
 688     {
 689             if (orient == wxHORIZONTAL)
 690                 nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
 691             else
 692                 nScrollInc = -GetScrollPageSize(wxVERTICAL);
 693     } else
 694     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEDOWN)
 695     {
 696             if (orient == wxHORIZONTAL)
 697                 nScrollInc = GetScrollPageSize(wxHORIZONTAL);
 698             else
 699                 nScrollInc = GetScrollPageSize(wxVERTICAL);
 700     } else
 701     if ((event.GetEventType() == wxEVT_SCROLLWIN_THUMBTRACK) ||
 702         (event.GetEventType() == wxEVT_SCROLLWIN_THUMBRELEASE))
 703     {
 704             if (orient == wxHORIZONTAL)
 705                 nScrollInc = pos - m_xScrollPosition;
 706             else
 707                 nScrollInc = pos - m_yScrollPosition;
 708     }
 709
 710     if (orient == wxHORIZONTAL)
 711     {
 712         if (m_xScrollPixelsPerLine > 0)
 713         {
 714             int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 715             if (max < 0) max = 0;
 716
 717             if ( (m_xScrollPosition + nScrollInc) < 0 )
 718                 nScrollInc = -m_xScrollPosition; // As -ve as we can go
 719             else if ( (m_xScrollPosition + nScrollInc) > max )
 720                 nScrollInc = max - m_xScrollPosition; // As +ve as we can go
 721         }
 722         else
 723             m_targetWindow->Refresh();
 724     }
 725     else
 726     {
 727         if (m_yScrollPixelsPerLine > 0)
 728         {
 729             int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 730             if (max < 0) max = 0;
 731
 732             if ( (m_yScrollPosition + nScrollInc) < 0 )
 733                 nScrollInc = -m_yScrollPosition; // As -ve as we can go
 734             else if ( (m_yScrollPosition + nScrollInc) > max )
 735                 nScrollInc = max - m_yScrollPosition; // As +ve as we can go
 736         }
 737         else
 738             m_targetWindow->Refresh();
 739     }
 740
 741     return nScrollInc;
 742 }
 743
 744 void wxScrolledWindow::SetScrollPos( int orient, int pos, bool refresh )
 745 {
 746     wxCHECK_RET( m_widget != NULL, wxT("invalid window") );
 747
 748     wxCHECK_RET( m_wxwindow != NULL, wxT("window needs client area for scrolling") );
 749
 750     if (orient == wxHORIZONTAL)
 751     {
 752         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 753         if (max < 0) max = 0;
 754
 755         if (pos > max) pos = 0;
 756         if (pos < 0) pos = 0;
 757
 758         if (pos == (int)(m_hAdjust->value+0.5)) return;
 759         m_hAdjust->value = pos;
 760     }
 761     else
 762     {
 763         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 764         if (max < 0) max = 0;
 765
 766         if (pos > max) pos = 0;
 767         if (pos < 0) pos = 0;
 768
 769         if (pos == (int)(m_vAdjust->value+0.5)) return;
 770         m_vAdjust->value = pos;
 771     }
 772
 773     if (m_wxwindow->window)
 774     {
 775         if (orient == wxHORIZONTAL)
 776         {
 777             // Just update the scrollbar, don't send any wxWindows event
 778             GtkHDisconnectEvent();
 779             gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 780             GtkHConnectEvent();
 781         }
 782         else
 783         {
 784             // Just update the scrollbar, don't send any wxWindows event
 785             GtkVDisconnectEvent();
 786             gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 787             GtkVConnectEvent();
 788         }
 789     }
 790 }
 791
 792 void wxScrolledWindow::GtkVConnectEvent()
 793 {
 794     gtk_signal_connect( GTK_OBJECT(m_vAdjust), "value_changed",
 795           (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 796 }
 797
 798 void wxScrolledWindow::GtkHConnectEvent()
 799 {
 800     gtk_signal_connect( GTK_OBJECT(m_hAdjust), "value_changed",
 801           (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 802 }
 803
 804 void wxScrolledWindow::GtkHDisconnectEvent()
 805 {
 806     gtk_signal_disconnect_by_func( GTK_OBJECT(m_hAdjust),
 807         (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 808 }
 809
 810 void wxScrolledWindow::GtkVDisconnectEvent()
 811 {
 812     gtk_signal_disconnect_by_func( GTK_OBJECT(m_vAdjust),
 813         (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 814 }
 815
 816
 817 bool wxScrolledWindow::Layout()
 818 {
 819     if (GetSizer())
 820     {
 821         // Take into account the virtual size and scrolled position of the window
 822         int x, y, w, h;
 823         CalcScrolledPosition(0,0, &x,&y);
 824         GetVirtualSize(&w, &h);
 825         GetSizer()->SetDimension(x, y, w, h);
 826         return TRUE;
 827     }
 828     else
 829         return wxPanel::Layout();  // fall back to default for LayoutConstraints
 830 }
 831
 832 // ----------------------------------------------------------------------------
 833 // event handlers
 834 // ----------------------------------------------------------------------------
 835
 836 // Default OnSize resets scrollbars, if any
 837 void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 838 {
 839 #if wxUSE_CONSTRAINTS
 840     if (GetAutoLayout())
 841         Layout();
 842 #endif
 843
 844     AdjustScrollbars();
 845 }
 846
 847 // This calls OnDraw, having adjusted the origin according to the current
 848 // scroll position
 849 void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 850 {
 851     wxPaintDC dc(this);
 852     PrepareDC(dc);
 853
 854     OnDraw(dc);
 855 }
 856
 857 // kbd handling: notice that we use OnChar() and not OnKeyDown() for
 858 // compatibility here - if we used OnKeyDown(), the programs which process
 859 // arrows themselves in their OnChar() would never get the message and like
 860 // this they always have the priority
 861 void wxScrolledWindow::OnChar(wxKeyEvent& event)
 862 {
 863     int stx, sty,       // view origin
 864         szx, szy,       // view size (total)
 865         clix, cliy;     // view size (on screen)
 866
 867     ViewStart(&stx, &sty);
 868     GetClientSize(&clix, &cliy);
 869     GetVirtualSize(&szx, &szy);
 870
 871     if( m_xScrollPixelsPerLine )
 872     {
 873         clix /= m_xScrollPixelsPerLine;
 874         szx /= m_xScrollPixelsPerLine;
 875     }
 876     else
 877     {
 878         clix = 0;
 879         szx = -1;
 880     }
 881     if( m_yScrollPixelsPerLine )
 882     {
 883         cliy /= m_yScrollPixelsPerLine;
 884         szy /= m_yScrollPixelsPerLine;
 885     }
 886     else
 887     {
 888         cliy = 0;
 889         szy = -1;
 890     }
 891
 892     int xScrollOld = GetScrollPos(wxHORIZONTAL),
 893         yScrollOld = GetScrollPos(wxVERTICAL);
 894
 895     int dsty;
 896     switch ( event.KeyCode() )
 897     {
 898         case WXK_PAGEUP:
 899         case WXK_PRIOR:
 900             dsty = sty - (5 * cliy / 6);
 901             Scroll(-1, (dsty == -1) ? 0 : dsty);
 902             break;
 903
 904         case WXK_PAGEDOWN:
 905         case WXK_NEXT:
 906             Scroll(-1, sty + (5 * cliy / 6));
 907             break;
 908
 909         case WXK_HOME:
 910             Scroll(0, event.ControlDown() ? 0 : -1);
 911             break;
 912
 913         case WXK_END:
 914             Scroll(szx - clix, event.ControlDown() ? szy - cliy : -1);
 915             break;
 916
 917         case WXK_UP:
 918             Scroll(-1, sty - 1);
 919             break;
 920
 921         case WXK_DOWN:
 922             Scroll(-1, sty + 1);
 923             break;
 924
 925         case WXK_LEFT:
 926             Scroll(stx - 1, -1);
 927             break;
 928
 929         case WXK_RIGHT:
 930             Scroll(stx + 1, -1);
 931             break;
 932
 933         default:
 934             // not for us
 935             event.Skip();
 936             return;
 937     }
 938
 939     int xScroll = GetScrollPos(wxHORIZONTAL);
 940     if ( xScroll != xScrollOld )
 941     {
 942         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, xScroll,
 943                                wxHORIZONTAL);
 944         event.SetEventObject(this);
 945         GetEventHandler()->ProcessEvent(event);
 946     }
 947
 948     int yScroll = GetScrollPos(wxVERTICAL);
 949     if ( yScroll != yScrollOld )
 950     {
 951         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, yScroll,
 952                                wxVERTICAL);
 953         event.SetEventObject(this);
 954         GetEventHandler()->ProcessEvent(event);
 955     }
 956 }
 957