src/gtk/scrolwin.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        gtk/scrolwin.cpp
   3 // Purpose:     wxScrolledWindow implementation
   4 // Author:      Julian Smart
   5 // Modified by: Ron Lee
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  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_xScrollLinesPerPage = 0;
 206     m_yScrollLinesPerPage = 0;
 207     m_targetWindow = (wxWindow*) NULL;
 208     m_scaleX = 1.0;
 209     m_scaleY = 1.0;
 210     m_hasScrolling = TRUE;
 211 }
 212
 213 bool wxScrolledWindow::Create(wxWindow *parent,
 214                               wxWindowID id,
 215                               const wxPoint& pos,
 216                               const wxSize& size,
 217                               long style,
 218                               const wxString& name)
 219 {
 220     Init();
 221
 222     if (!PreCreation( parent, pos, size ) ||
 223         !CreateBase( parent, id, pos, size, style, wxDefaultValidator, name ))
 224     {
 225         wxFAIL_MSG( wxT("wxWindow creation failed") );
 226         return FALSE;
 227     }
 228
 229     m_insertCallback = wxInsertChildInScrolledWindow;
 230
 231     m_targetWindow = this;
 232
 233     m_widget = gtk_scrolled_window_new( (GtkAdjustment *) NULL, (GtkAdjustment *) NULL );
 234     GTK_WIDGET_UNSET_FLAGS( m_widget, GTK_CAN_FOCUS );
 235
 236     GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(m_widget);
 237
 238     GtkScrolledWindowClass *scroll_class = GTK_SCROLLED_WINDOW_CLASS( GTK_OBJECT_GET_CLASS(m_widget) );
 239     scroll_class->scrollbar_spacing = 0;
 240
 241     gtk_scrolled_window_set_policy( scrolledWindow, GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC );
 242
 243     m_hAdjust = gtk_range_get_adjustment( GTK_RANGE(scrolledWindow->hscrollbar) );
 244     m_vAdjust = gtk_range_get_adjustment( GTK_RANGE(scrolledWindow->vscrollbar) );
 245
 246     m_wxwindow = gtk_pizza_new();
 247
 248     gtk_container_add( GTK_CONTAINER(m_widget), m_wxwindow );
 249
 250     GtkPizza *pizza = GTK_PIZZA(m_wxwindow);
 251
 252     if (HasFlag(wxRAISED_BORDER))
 253     {
 254         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_OUT );
 255     }
 256     else if (HasFlag(wxSUNKEN_BORDER))
 257     {
 258         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_IN );
 259     }
 260     else if (HasFlag(wxSIMPLE_BORDER))
 261     {
 262         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_THIN );
 263     }
 264     else
 265     {
 266         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_NONE );
 267     }
 268
 269     GTK_WIDGET_SET_FLAGS( m_wxwindow, GTK_CAN_FOCUS );
 270     m_acceptsFocus = TRUE;
 271
 272     // I _really_ don't want scrollbars in the beginning
 273     m_vAdjust->lower = 0.0;
 274     m_vAdjust->upper = 1.0;
 275     m_vAdjust->value = 0.0;
 276     m_vAdjust->step_increment = 1.0;
 277     m_vAdjust->page_increment = 2.0;
 278     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 279     m_hAdjust->lower = 0.0;
 280     m_hAdjust->upper = 1.0;
 281     m_hAdjust->value = 0.0;
 282     m_hAdjust->step_increment = 1.0;
 283     m_hAdjust->page_increment = 2.0;
 284     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 285
 286     // Handlers for new scrollbar values
 287     GtkVConnectEvent();
 288     GtkHConnectEvent();
 289
 290     // these handlers block mouse events to any window during scrolling such as
 291     // motion events and prevent GTK and wxWindows from fighting over where the
 292     // slider should be
 293
 294     gtk_signal_connect( GTK_OBJECT(scrolledWindow->vscrollbar), "button_press_event",
 295           (GtkSignalFunc)gtk_scrollbar_button_press_callback, (gpointer) this );
 296
 297     gtk_signal_connect( GTK_OBJECT(scrolledWindow->hscrollbar), "button_press_event",
 298           (GtkSignalFunc)gtk_scrollbar_button_press_callback, (gpointer) this );
 299
 300     gtk_signal_connect( GTK_OBJECT(scrolledWindow->vscrollbar), "button_release_event",
 301           (GtkSignalFunc)gtk_scrollbar_button_release_callback, (gpointer) this );
 302
 303     gtk_signal_connect( GTK_OBJECT(scrolledWindow->hscrollbar), "button_release_event",
 304           (GtkSignalFunc)gtk_scrollbar_button_release_callback, (gpointer) this );
 305
 306     gtk_widget_show( m_wxwindow );
 307
 308     if (m_parent)
 309         m_parent->DoAddChild( this );
 310
 311     m_focusWidget = m_wxwindow;
 312
 313     PostCreation();
 314
 315     Show( TRUE );
 316
 317     return TRUE;
 318 }
 319
 320 // ----------------------------------------------------------------------------
 321 // setting scrolling parameters
 322 // ----------------------------------------------------------------------------
 323
 324 void wxScrolledWindow::DoSetVirtualSize( int x, int y )
 325 {
 326     wxPanel::DoSetVirtualSize( x, y );
 327     AdjustScrollbars();
 328
 329 #if wxUSE_CONSTRAINTS
 330     if (GetAutoLayout())
 331         Layout();
 332 #endif
 333 }
 334
 335 /*
 336  * pixelsPerUnitX/pixelsPerUnitY: number of pixels per unit (e.g. pixels per text line)
 337  * noUnitsX/noUnitsY:        : no. units per scrollbar
 338  */
 339 void wxScrolledWindow::SetScrollbars( int pixelsPerUnitX, int pixelsPerUnitY,
 340                                       int noUnitsX, int noUnitsY,
 341                                       int xPos, int yPos, bool noRefresh )
 342 {
 343     int xs, ys;
 344     GetViewStart (& xs, & ys);
 345
 346     int old_x = m_xScrollPixelsPerLine * xs;
 347     int old_y = m_yScrollPixelsPerLine * ys;
 348
 349     m_xScrollPixelsPerLine = pixelsPerUnitX;
 350     m_yScrollPixelsPerLine = pixelsPerUnitY;
 351
 352     m_hAdjust->value = m_xScrollPosition = xPos;
 353     m_vAdjust->value = m_yScrollPosition = yPos;
 354
 355     // Setting hints here should arguably be deprecated, but without it
 356     // a sizer might override this manual scrollbar setting in old code.
 357     m_targetWindow->SetVirtualSizeHints( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY );
 358
 359     m_targetWindow->SetVirtualSize( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY );
 360
 361     if (!noRefresh)
 362     {
 363         int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 364         int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 365
 366         m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
 367     }
 368 }
 369
 370 void wxScrolledWindow::AdjustScrollbars()
 371 {
 372     int w, h;
 373     int vw, vh;
 374
 375     m_targetWindow->GetClientSize( &w, &h );
 376     m_targetWindow->GetVirtualSize( &vw, &vh );
 377
 378     if (m_xScrollPixelsPerLine == 0)
 379     {
 380         m_hAdjust->upper = 1.0;
 381         m_hAdjust->page_size = 1.0;
 382     }
 383     else
 384     {
 385         m_hAdjust->upper = vw / m_xScrollPixelsPerLine;
 386         m_hAdjust->page_size = (w / m_xScrollPixelsPerLine);
 387
 388         // If the scrollbar hits the right side, move the window
 389         // right to keep it from over extending.
 390
 391         if ((m_hAdjust->value != 0.0) && (m_hAdjust->value + m_hAdjust->page_size > m_hAdjust->upper))
 392         {
 393             m_hAdjust->value = m_hAdjust->upper - m_hAdjust->page_size;
 394             if (m_hAdjust->value < 0.0)
 395                 m_hAdjust->value = 0.0;
 396
 397             if (GetChildren().GetCount() == 0)
 398                 m_xScrollPosition = (int)m_hAdjust->value; // This is enough without child windows
 399             else
 400                 gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" ); // Actually scroll window
 401         }
 402     }
 403
 404     if (m_yScrollPixelsPerLine == 0)
 405     {
 406         m_vAdjust->upper = 1.0;
 407         m_vAdjust->page_size = 1.0;
 408     }
 409     else
 410     {
 411         m_vAdjust->upper = vh / m_yScrollPixelsPerLine;
 412         m_vAdjust->page_size = (h / m_yScrollPixelsPerLine);
 413
 414         if ((m_vAdjust->value != 0.0) && (m_vAdjust->value + m_vAdjust->page_size > m_vAdjust->upper))
 415         {
 416             m_vAdjust->value = m_vAdjust->upper - m_vAdjust->page_size;
 417             if (m_vAdjust->value < 0.0)
 418                 m_vAdjust->value = 0.0;
 419
 420             if (GetChildren().GetCount() == 0)
 421                 m_yScrollPosition = (int)m_vAdjust->value;
 422             else
 423                 gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 424         }
 425     }
 426
 427     m_xScrollLinesPerPage = (int)(m_hAdjust->page_size + 0.5);
 428     m_yScrollLinesPerPage = (int)(m_vAdjust->page_size + 0.5);
 429
 430     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 431     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 432 }
 433
 434
 435 // ----------------------------------------------------------------------------
 436 // target window handling
 437 // ----------------------------------------------------------------------------
 438
 439 void wxScrolledWindow::SetTargetWindow( wxWindow *target, bool WXUNUSED(pushEventHandler) )
 440 {
 441     wxASSERT_MSG( target, wxT("target window must not be NULL") );
 442     m_targetWindow = target;
 443 }
 444
 445 wxWindow *wxScrolledWindow::GetTargetWindow() const
 446 {
 447     return m_targetWindow;
 448 }
 449
 450 // Override this function if you don't want to have wxScrolledWindow
 451 // automatically change the origin according to the scroll position.
 452 void wxScrolledWindow::PrepareDC(wxDC& dc)
 453 {
 454     dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,
 455                         -m_yScrollPosition * m_yScrollPixelsPerLine );
 456 }
 457
 458 void wxScrolledWindow::SetScrollRate( int xstep, int ystep )
 459 {
 460     int old_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 461     int old_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 462
 463     m_xScrollPixelsPerLine = xstep;
 464     m_yScrollPixelsPerLine = ystep;
 465
 466     int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 467     int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 468
 469     m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
 470
 471     AdjustScrollbars();
 472 }
 473
 474 void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 475 {
 476     if ( x_unit )
 477         *x_unit = m_xScrollPixelsPerLine;
 478     if ( y_unit )
 479         *y_unit = m_yScrollPixelsPerLine;
 480 }
 481
 482 int wxScrolledWindow::GetScrollPageSize(int orient) const
 483 {
 484     if ( orient == wxHORIZONTAL )
 485         return m_xScrollLinesPerPage;
 486     else
 487         return m_yScrollLinesPerPage;
 488 }
 489
 490 void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
 491 {
 492     if ( orient == wxHORIZONTAL )
 493         m_xScrollLinesPerPage = pageSize;
 494     else
 495         m_yScrollLinesPerPage = pageSize;
 496 }
 497
 498 void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)
 499 {
 500     int orient = event.GetOrientation();
 501
 502     int nScrollInc = CalcScrollInc(event);
 503     if (nScrollInc == 0) return;
 504
 505     if (orient == wxHORIZONTAL)
 506     {
 507         int newPos = m_xScrollPosition + nScrollInc;
 508         SetScrollPos(wxHORIZONTAL, newPos, TRUE );
 509     }
 510     else
 511     {
 512         int newPos = m_yScrollPosition + nScrollInc;
 513         SetScrollPos(wxVERTICAL, newPos, TRUE );
 514     }
 515
 516     if (orient == wxHORIZONTAL)
 517     {
 518         m_xScrollPosition += nScrollInc;
 519     }
 520     else
 521     {
 522         m_yScrollPosition += nScrollInc;
 523     }
 524
 525     if (orient == wxHORIZONTAL)
 526     {
 527        if (m_xScrollingEnabled)
 528             m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
 529        else
 530             m_targetWindow->Refresh();
 531     }
 532     else
 533     {
 534         if (m_yScrollingEnabled)
 535             m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
 536         else
 537             m_targetWindow->Refresh();
 538     }
 539 }
 540
 541 void wxScrolledWindow::Scroll( int x_pos, int y_pos )
 542 {
 543     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 544
 545     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
 546         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
 547
 548     if ((x_pos != -1) && (m_xScrollPixelsPerLine))
 549     {
 550         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 551         if (max < 0) max = 0;
 552         if (x_pos > max) x_pos = max;
 553         if (x_pos < 0) x_pos = 0;
 554
 555         int old_x = m_xScrollPosition;
 556         m_xScrollPosition = x_pos;
 557         m_hAdjust->value = x_pos;
 558
 559         m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
 560
 561         // Just update the scrollbar, don't send any wxWindows event
 562         GtkHDisconnectEvent();
 563         gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 564         GtkHConnectEvent();
 565     }
 566
 567     if ((y_pos != -1) && (m_yScrollPixelsPerLine))
 568     {
 569         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 570         if (max < 0) max = 0;
 571         if (y_pos > max) y_pos = max;
 572         if (y_pos < 0) y_pos = 0;
 573
 574         int old_y = m_yScrollPosition;
 575         m_yScrollPosition = y_pos;
 576         m_vAdjust->value = y_pos;
 577
 578         m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
 579
 580         // Just update the scrollbar, don't send any wxWindows event
 581         GtkVDisconnectEvent();
 582         gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 583         GtkVConnectEvent();
 584     }
 585 }
 586
 587 // TODO: [VH]Scroll functions should be combined
 588
 589 void wxScrolledWindow::GtkVScroll( float value, unsigned int scroll_type )
 590 {
 591     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 592
 593     if (m_yScrollPixelsPerLine == 0)
 594         return;
 595
 596     int y_pos = (int)(value+0.5);
 597
 598     if (y_pos == m_yScrollPosition)
 599         return;
 600
 601     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 602
 603     wxScrollWinEvent event( command, y_pos, wxVERTICAL );
 604     event.SetEventObject( this );
 605     GetEventHandler()->ProcessEvent( event );
 606 }
 607
 608 void wxScrolledWindow::GtkHScroll( float value, unsigned int scroll_type )
 609 {
 610     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 611
 612     if (m_xScrollPixelsPerLine == 0)
 613         return;
 614
 615     int x_pos = (int)(value+0.5);
 616
 617     if (x_pos == m_xScrollPosition)
 618         return;
 619
 620     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 621
 622     wxScrollWinEvent event( command, x_pos, wxHORIZONTAL );
 623     event.SetEventObject( this );
 624     GetEventHandler()->ProcessEvent( event );
 625 }
 626
 627 void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
 628 {
 629     m_xScrollingEnabled = x_scroll;
 630     m_yScrollingEnabled = y_scroll;
 631 }
 632
 633 // Where the current view starts from
 634 void wxScrolledWindow::GetViewStart (int *x, int *y) const
 635 {
 636     if ( x )
 637         *x = m_xScrollPosition;
 638     if ( y )
 639         *y = m_yScrollPosition;
 640 }
 641
 642 void wxScrolledWindow::DoCalcScrolledPosition(int x, int y, int *xx, int *yy) const
 643 {
 644     int xs, ys;
 645     GetViewStart (& xs, & ys);
 646
 647     if ( xx )
 648         *xx = x - xs * m_xScrollPixelsPerLine;
 649     if ( yy )
 650         *yy = y - ys * m_yScrollPixelsPerLine;
 651 }
 652
 653 void wxScrolledWindow::DoCalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
 654 {
 655     int xs, ys;
 656     GetViewStart (& xs, & ys);
 657
 658     if ( xx )
 659         *xx = x + xs * m_xScrollPixelsPerLine;
 660     if ( yy )
 661         *yy = y + ys * m_yScrollPixelsPerLine;
 662 }
 663
 664 int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
 665 {
 666     int pos = event.GetPosition();
 667     int orient = event.GetOrientation();
 668
 669     int nScrollInc = 0;
 670     if (event.GetEventType() == wxEVT_SCROLLWIN_TOP)
 671     {
 672             if (orient == wxHORIZONTAL)
 673                 nScrollInc = - m_xScrollPosition;
 674             else
 675                 nScrollInc = - m_yScrollPosition;
 676     } else
 677     if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
 678     {
 679             if (orient == wxHORIZONTAL)
 680                 nScrollInc = GetVirtualSize().GetWidth() / m_xScrollPixelsPerLine - m_xScrollPosition;
 681             else
 682                 nScrollInc = GetVirtualSize().GetHeight() / m_yScrollPixelsPerLine - m_yScrollPosition;
 683     } else
 684     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
 685     {
 686             nScrollInc = -1;
 687     } else
 688     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN)
 689     {
 690             nScrollInc = 1;
 691     } else
 692     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEUP)
 693     {
 694             if (orient == wxHORIZONTAL)
 695                 nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
 696             else
 697                 nScrollInc = -GetScrollPageSize(wxVERTICAL);
 698     } else
 699     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEDOWN)
 700     {
 701             if (orient == wxHORIZONTAL)
 702                 nScrollInc = GetScrollPageSize(wxHORIZONTAL);
 703             else
 704                 nScrollInc = GetScrollPageSize(wxVERTICAL);
 705     } else
 706     if ((event.GetEventType() == wxEVT_SCROLLWIN_THUMBTRACK) ||
 707         (event.GetEventType() == wxEVT_SCROLLWIN_THUMBRELEASE))
 708     {
 709             if (orient == wxHORIZONTAL)
 710                 nScrollInc = pos - m_xScrollPosition;
 711             else
 712                 nScrollInc = pos - m_yScrollPosition;
 713     }
 714
 715     if (orient == wxHORIZONTAL)
 716     {
 717         if (m_xScrollPixelsPerLine > 0)
 718         {
 719             int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 720             if (max < 0) max = 0;
 721
 722             if ( (m_xScrollPosition + nScrollInc) < 0 )
 723                 nScrollInc = -m_xScrollPosition; // As -ve as we can go
 724             else if ( (m_xScrollPosition + nScrollInc) > max )
 725                 nScrollInc = max - m_xScrollPosition; // As +ve as we can go
 726         }
 727         else
 728             m_targetWindow->Refresh();
 729     }
 730     else
 731     {
 732         if (m_yScrollPixelsPerLine > 0)
 733         {
 734             int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 735             if (max < 0) max = 0;
 736
 737             if ( (m_yScrollPosition + nScrollInc) < 0 )
 738                 nScrollInc = -m_yScrollPosition; // As -ve as we can go
 739             else if ( (m_yScrollPosition + nScrollInc) > max )
 740                 nScrollInc = max - m_yScrollPosition; // As +ve as we can go
 741         }
 742         else
 743             m_targetWindow->Refresh();
 744     }
 745
 746     return nScrollInc;
 747 }
 748
 749 void wxScrolledWindow::SetScrollPos( int orient, int pos, bool refresh )
 750 {
 751     wxCHECK_RET( m_widget != NULL, wxT("invalid window") );
 752
 753     wxCHECK_RET( m_wxwindow != NULL, wxT("window needs client area for scrolling") );
 754
 755     if (orient == wxHORIZONTAL)
 756     {
 757         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 758         if (max < 0) max = 0;
 759
 760         if (pos > max) pos = 0;
 761         if (pos < 0) pos = 0;
 762
 763         if (pos == (int)(m_hAdjust->value+0.5)) return;
 764         m_hAdjust->value = pos;
 765     }
 766     else
 767     {
 768         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 769         if (max < 0) max = 0;
 770
 771         if (pos > max) pos = 0;
 772         if (pos < 0) pos = 0;
 773
 774         if (pos == (int)(m_vAdjust->value+0.5)) return;
 775         m_vAdjust->value = pos;
 776     }
 777
 778     if (m_wxwindow->window)
 779     {
 780         if (orient == wxHORIZONTAL)
 781         {
 782             // Just update the scrollbar, don't send any wxWindows event
 783             GtkHDisconnectEvent();
 784             gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 785             GtkHConnectEvent();
 786         }
 787         else
 788         {
 789             // Just update the scrollbar, don't send any wxWindows event
 790             GtkVDisconnectEvent();
 791             gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 792             GtkVConnectEvent();
 793         }
 794     }
 795 }
 796
 797 void wxScrolledWindow::GtkVConnectEvent()
 798 {
 799     gtk_signal_connect( GTK_OBJECT(m_vAdjust), "value_changed",
 800           (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 801 }
 802
 803 void wxScrolledWindow::GtkHConnectEvent()
 804 {
 805     gtk_signal_connect( GTK_OBJECT(m_hAdjust), "value_changed",
 806           (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 807 }
 808
 809 void wxScrolledWindow::GtkHDisconnectEvent()
 810 {
 811     gtk_signal_disconnect_by_func( GTK_OBJECT(m_hAdjust),
 812         (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 813 }
 814
 815 void wxScrolledWindow::GtkVDisconnectEvent()
 816 {
 817     gtk_signal_disconnect_by_func( GTK_OBJECT(m_vAdjust),
 818         (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 819 }
 820
 821 bool wxScrolledWindow::Layout()
 822 {
 823     if (GetSizer() && m_targetWindow == this)
 824     {
 825         // If we're the scroll target, take into account the
 826         // virtual size and scrolled position of the window.
 827
 828         int x, y, w, h;
 829         CalcScrolledPosition(0,0, &x,&y);
 830         GetVirtualSize(&w, &h);
 831         GetSizer()->SetDimension(x, y, w, h);
 832         return TRUE;
 833     }
 834     else
 835         return wxPanel::Layout();  // fall back to default for LayoutConstraints
 836 }
 837
 838 // ----------------------------------------------------------------------------
 839 // event handlers
 840 // ----------------------------------------------------------------------------
 841
 842 // Default OnSize resets scrollbars, if any
 843 void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 844 {
 845     if( GetAutoLayout() || m_targetWindow->GetAutoLayout() )
 846     {
 847         if( m_targetWindow != this )
 848             m_targetWindow->FitInside();
 849
 850         FitInside();
 851
 852         // FIXME:  Something is really weird here...  This should be
 853         // called by FitInside above (and apparently is), yet the
 854         // scrollsub sample will get the scrollbar wrong if resized
 855         // quickly.  This masks the bug, but is surely not the right
 856         // answer at all.
 857         AdjustScrollbars();
 858     }
 859     else
 860     {
 861         AdjustScrollbars();
 862     }
 863 }
 864
 865 // This calls OnDraw, having adjusted the origin according to the current
 866 // scroll position
 867 void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 868 {
 869     wxPaintDC dc(this);
 870     PrepareDC(dc);
 871
 872     OnDraw(dc);
 873 }
 874
 875 // kbd handling: notice that we use OnChar() and not OnKeyDown() for
 876 // compatibility here - if we used OnKeyDown(), the programs which process
 877 // arrows themselves in their OnChar() would never get the message and like
 878 // this they always have the priority
 879 void wxScrolledWindow::OnChar(wxKeyEvent& event)
 880 {
 881     int stx, sty,       // view origin
 882         szx, szy,       // view size (total)
 883         clix, cliy;     // view size (on screen)
 884
 885     GetViewStart(&stx, &sty);
 886     GetClientSize(&clix, &cliy);
 887     GetVirtualSize(&szx, &szy);
 888
 889     if( m_xScrollPixelsPerLine )
 890     {
 891         clix /= m_xScrollPixelsPerLine;
 892         szx /= m_xScrollPixelsPerLine;
 893     }
 894     else
 895     {
 896         clix = 0;
 897         szx = -1;
 898     }
 899     if( m_yScrollPixelsPerLine )
 900     {
 901         cliy /= m_yScrollPixelsPerLine;
 902         szy /= m_yScrollPixelsPerLine;
 903     }
 904     else
 905     {
 906         cliy = 0;
 907         szy = -1;
 908     }
 909
 910     int xScrollOld = GetScrollPos(wxHORIZONTAL),
 911         yScrollOld = GetScrollPos(wxVERTICAL);
 912
 913     int dsty;
 914     switch ( event.GetKeyCode() )
 915     {
 916         case WXK_PAGEUP:
 917         case WXK_PRIOR:
 918             dsty = sty - (5 * cliy / 6);
 919             Scroll(-1, (dsty == -1) ? 0 : dsty);
 920             break;
 921
 922         case WXK_PAGEDOWN:
 923         case WXK_NEXT:
 924             Scroll(-1, sty + (5 * cliy / 6));
 925             break;
 926
 927         case WXK_HOME:
 928             Scroll(0, event.ControlDown() ? 0 : -1);
 929             break;
 930
 931         case WXK_END:
 932             Scroll(szx - clix, event.ControlDown() ? szy - cliy : -1);
 933             break;
 934
 935         case WXK_UP:
 936             Scroll(-1, sty - 1);
 937             break;
 938
 939         case WXK_DOWN:
 940             Scroll(-1, sty + 1);
 941             break;
 942
 943         case WXK_LEFT:
 944             Scroll(stx - 1, -1);
 945             break;
 946
 947         case WXK_RIGHT:
 948             Scroll(stx + 1, -1);
 949             break;
 950
 951         default:
 952             // not for us
 953             event.Skip();
 954             return;
 955     }
 956
 957     int xScroll = GetScrollPos(wxHORIZONTAL);
 958     if ( xScroll != xScrollOld )
 959     {
 960         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, xScroll,
 961                                wxHORIZONTAL);
 962         event.SetEventObject(this);
 963         GetEventHandler()->ProcessEvent(event);
 964     }
 965
 966     int yScroll = GetScrollPos(wxVERTICAL);
 967     if ( yScroll != yScrollOld )
 968     {
 969         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, yScroll,
 970                                wxVERTICAL);
 971         event.SetEventObject(this);
 972         GetEventHandler()->ProcessEvent(event);
 973     }
 974 }
 975
 976
 977 // vi:sts=4:sw=4:et