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