src/gtk1/scrolwin.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        gtk/scrolwin.cpp
   3 // Purpose:     wxScrolledWindow implementation
   4 // Author:      Robert Roebling
   5 // Modified by: Ron Lee
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Robert Roebling
   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/scrolwin.h"
  32 #include "wx/utils.h"
  33 #include "wx/dcclient.h"
  34 #include "wx/panel.h"
  35 #include "wx/sizer.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_xScrollLinesPerPage = 0;
 205     m_yScrollLinesPerPage = 0;
 206     m_targetWindow = (wxWindow*) NULL;
 207     m_scaleX = 1.0;
 208     m_scaleY = 1.0;
 209     m_hasScrolling = TRUE;
 210 }
 211
 212 bool wxScrolledWindow::Create(wxWindow *parent,
 213                               wxWindowID id,
 214                               const wxPoint& pos,
 215                               const wxSize& size,
 216                               long style,
 217                               const wxString& name)
 218 {
 219     Init();
 220
 221     if (!PreCreation( parent, pos, size ) ||
 222         !CreateBase( parent, id, pos, size, style, wxDefaultValidator, name ))
 223     {
 224         wxFAIL_MSG( wxT("wxWindow creation failed") );
 225         return FALSE;
 226     }
 227
 228     m_insertCallback = wxInsertChildInScrolledWindow;
 229
 230     m_targetWindow = this;
 231
 232     m_widget = gtk_scrolled_window_new( (GtkAdjustment *) NULL, (GtkAdjustment *) NULL );
 233     GTK_WIDGET_UNSET_FLAGS( m_widget, GTK_CAN_FOCUS );
 234
 235     GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(m_widget);
 236
 237     GtkScrolledWindowClass *scroll_class = GTK_SCROLLED_WINDOW_CLASS( GTK_OBJECT_GET_CLASS(m_widget) );
 238     scroll_class->scrollbar_spacing = 0;
 239
 240     gtk_scrolled_window_set_policy( scrolledWindow, GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC );
 241
 242     m_hAdjust = gtk_range_get_adjustment( GTK_RANGE(scrolledWindow->hscrollbar) );
 243     m_vAdjust = gtk_range_get_adjustment( GTK_RANGE(scrolledWindow->vscrollbar) );
 244
 245     m_wxwindow = gtk_pizza_new();
 246
 247     gtk_container_add( GTK_CONTAINER(m_widget), m_wxwindow );
 248
 249     GtkPizza *pizza = GTK_PIZZA(m_wxwindow);
 250
 251     if (HasFlag(wxRAISED_BORDER))
 252     {
 253         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_OUT );
 254     }
 255     else if (HasFlag(wxSUNKEN_BORDER))
 256     {
 257         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_IN );
 258     }
 259     else if (HasFlag(wxSIMPLE_BORDER))
 260     {
 261         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_THIN );
 262     }
 263     else
 264     {
 265         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_NONE );
 266     }
 267
 268     GTK_WIDGET_SET_FLAGS( m_wxwindow, GTK_CAN_FOCUS );
 269     m_acceptsFocus = TRUE;
 270
 271     // I _really_ don't want scrollbars in the beginning
 272     m_vAdjust->lower = 0.0;
 273     m_vAdjust->upper = 1.0;
 274     m_vAdjust->value = 0.0;
 275     m_vAdjust->step_increment = 1.0;
 276     m_vAdjust->page_increment = 2.0;
 277     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 278     m_hAdjust->lower = 0.0;
 279     m_hAdjust->upper = 1.0;
 280     m_hAdjust->value = 0.0;
 281     m_hAdjust->step_increment = 1.0;
 282     m_hAdjust->page_increment = 2.0;
 283     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 284
 285     // Handlers for new scrollbar values
 286     GtkVConnectEvent();
 287     GtkHConnectEvent();
 288
 289     // these handlers block mouse events to any window during scrolling such as
 290     // motion events and prevent GTK and wxWidgets from fighting over where the
 291     // slider should be
 292
 293     gtk_signal_connect( GTK_OBJECT(scrolledWindow->vscrollbar), "button_press_event",
 294           (GtkSignalFunc)gtk_scrollbar_button_press_callback, (gpointer) this );
 295
 296     gtk_signal_connect( GTK_OBJECT(scrolledWindow->hscrollbar), "button_press_event",
 297           (GtkSignalFunc)gtk_scrollbar_button_press_callback, (gpointer) this );
 298
 299     gtk_signal_connect( GTK_OBJECT(scrolledWindow->vscrollbar), "button_release_event",
 300           (GtkSignalFunc)gtk_scrollbar_button_release_callback, (gpointer) this );
 301
 302     gtk_signal_connect( GTK_OBJECT(scrolledWindow->hscrollbar), "button_release_event",
 303           (GtkSignalFunc)gtk_scrollbar_button_release_callback, (gpointer) this );
 304
 305     gtk_widget_show( m_wxwindow );
 306
 307     if (m_parent)
 308         m_parent->DoAddChild( this );
 309
 310     m_focusWidget = m_wxwindow;
 311
 312     PostCreation();
 313
 314     Show( TRUE );
 315
 316     return TRUE;
 317 }
 318
 319 // ----------------------------------------------------------------------------
 320 // setting scrolling parameters
 321 // ----------------------------------------------------------------------------
 322
 323 void wxScrolledWindow::DoSetVirtualSize( int x, int y )
 324 {
 325     wxPanel::DoSetVirtualSize( x, y );
 326     AdjustScrollbars();
 327
 328     if (GetAutoLayout())
 329         Layout();
 330 }
 331
 332 // wxWindow's GetBestVirtualSize returns the actual window size,
 333 // whereas we want to return the virtual size
 334 wxSize wxScrolledWindow::GetBestVirtualSize() const
 335 {
 336     wxSize  clientSize( GetClientSize() );
 337     if (GetSizer())
 338     {
 339         wxSize minSize( GetSizer()->CalcMin() );
 340
 341         return wxSize( wxMax( clientSize.x, minSize.x ), wxMax( clientSize.y, minSize.y ) );
 342     }
 343     else
 344         return clientSize;
 345 }
 346
 347 // return the size best suited for the current window
 348 // (this isn't a virtual size, this is a sensible size for the window)
 349 wxSize wxScrolledWindow::DoGetBestSize() const
 350 {
 351     wxSize best;
 352
 353     if ( GetSizer() )
 354     {
 355         wxSize b = GetSizer()->GetMinSize();
 356
 357         // Only use the content to set the window size in the direction
 358         // where there's no scrolling; otherwise we're going to get a huge
 359         // window in the direction in which scrolling is enabled
 360         int ppuX, ppuY;
 361         GetScrollPixelsPerUnit(& ppuX, & ppuY);
 362
 363         wxSize minSize;
 364         if ( GetMinSize().IsFullySpecified() )
 365             minSize = GetMinSize();
 366         else
 367             minSize = GetSize();
 368
 369         if (ppuX > 0)
 370             b.x = minSize.x;
 371         if (ppuY > 0)
 372             b.y = minSize.y;
 373         best = b;
 374     }
 375     else
 376         return wxWindow::DoGetBestSize();
 377
 378     // Add any difference between size and client size
 379     wxSize diff = GetSize() - GetClientSize();
 380     best.x += wxMax(0, diff.x);
 381     best.y += wxMax(0, diff.y);
 382
 383     return best;
 384 }
 385
 386 /*
 387  * pixelsPerUnitX/pixelsPerUnitY: number of pixels per unit (e.g. pixels per text line)
 388  * noUnitsX/noUnitsY:        : no. units per scrollbar
 389  */
 390 void wxScrolledWindow::SetScrollbars( int pixelsPerUnitX, int pixelsPerUnitY,
 391                                       int noUnitsX, int noUnitsY,
 392                                       int xPos, int yPos, bool noRefresh )
 393 {
 394     int xs, ys;
 395     GetViewStart (& xs, & ys);
 396
 397     int old_x = m_xScrollPixelsPerLine * xs;
 398     int old_y = m_yScrollPixelsPerLine * ys;
 399
 400     m_xScrollPixelsPerLine = pixelsPerUnitX;
 401     m_yScrollPixelsPerLine = pixelsPerUnitY;
 402
 403     m_hAdjust->value = m_xScrollPosition = xPos;
 404     m_vAdjust->value = m_yScrollPosition = yPos;
 405
 406     // Setting hints here should arguably be deprecated, but without it
 407     // a sizer might override this manual scrollbar setting in old code.
 408     // m_targetWindow->SetVirtualSizeHints( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY );
 409
 410     m_targetWindow->SetVirtualSize( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY );
 411
 412     if (!noRefresh)
 413     {
 414         int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 415         int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 416
 417         m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
 418     }
 419 }
 420
 421 void wxScrolledWindow::AdjustScrollbars()
 422 {
 423     int w, h;
 424     int vw, vh;
 425
 426     m_targetWindow->GetClientSize( &w, &h );
 427     m_targetWindow->GetVirtualSize( &vw, &vh );
 428
 429     if (m_xScrollPixelsPerLine == 0)
 430     {
 431         m_hAdjust->upper = 1.0;
 432         m_hAdjust->page_increment = 1.0;
 433         m_hAdjust->page_size = 1.0;
 434     }
 435     else
 436     {
 437         m_hAdjust->upper = (vw+m_xScrollPixelsPerLine-1) / m_xScrollPixelsPerLine;
 438         m_hAdjust->page_size = w / m_xScrollPixelsPerLine;
 439         m_hAdjust->page_increment = w / m_xScrollPixelsPerLine;
 440
 441         // Special case. When client and virtual size are very close but
 442         // the client is big enough, kill scrollbar.
 443
 444         if ((m_hAdjust->page_size < m_hAdjust->upper) && (w >= vw))
 445             m_hAdjust->page_size += 1.0;
 446
 447         // If the scrollbar hits the right side, move the window
 448         // right to keep it from over extending.
 449
 450         if ((m_hAdjust->value != 0.0) && (m_hAdjust->value + m_hAdjust->page_size > m_hAdjust->upper))
 451         {
 452             m_hAdjust->value = m_hAdjust->upper - m_hAdjust->page_size;
 453             if (m_hAdjust->value < 0.0)
 454                 m_hAdjust->value = 0.0;
 455
 456             if (GetChildren().GetCount() == 0)
 457                 m_xScrollPosition = (int)m_hAdjust->value; // This is enough without child windows
 458             else
 459                 gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" ); // Actually scroll window
 460         }
 461     }
 462
 463     if (m_yScrollPixelsPerLine == 0)
 464     {
 465         m_vAdjust->upper = 1.0;
 466         m_vAdjust->page_increment = 1.0;
 467         m_vAdjust->page_size = 1.0;
 468     }
 469     else
 470     {
 471         m_vAdjust->upper = (vh+m_yScrollPixelsPerLine-1) / m_yScrollPixelsPerLine;
 472         m_vAdjust->page_size = h / m_yScrollPixelsPerLine;
 473         m_vAdjust->page_increment = h / m_yScrollPixelsPerLine;
 474
 475         if ((m_vAdjust->page_size < m_vAdjust->upper) && (h >= vh))
 476             m_vAdjust->page_size += 1.0;
 477
 478         if ((m_vAdjust->value != 0.0) && (m_vAdjust->value + m_vAdjust->page_size > m_vAdjust->upper))
 479         {
 480             m_vAdjust->value = m_vAdjust->upper - m_vAdjust->page_size;
 481             if (m_vAdjust->value < 0.0)
 482                 m_vAdjust->value = 0.0;
 483
 484             if (GetChildren().GetCount() == 0)
 485                 m_yScrollPosition = (int)m_vAdjust->value;
 486             else
 487                 gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 488         }
 489     }
 490
 491     m_xScrollLinesPerPage = (int)(m_hAdjust->page_increment + 0.5);
 492     m_yScrollLinesPerPage = (int)(m_vAdjust->page_increment + 0.5);
 493
 494     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 495     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 496 }
 497
 498
 499 // ----------------------------------------------------------------------------
 500 // target window handling
 501 // ----------------------------------------------------------------------------
 502
 503 void wxScrolledWindow::SetTargetWindow( wxWindow *target, bool WXUNUSED(pushEventHandler) )
 504 {
 505     wxASSERT_MSG( target, wxT("target window must not be NULL") );
 506     m_targetWindow = target;
 507 }
 508
 509 wxWindow *wxScrolledWindow::GetTargetWindow() const
 510 {
 511     return m_targetWindow;
 512 }
 513
 514 // Override this function if you don't want to have wxScrolledWindow
 515 // automatically change the origin according to the scroll position.
 516 void wxScrolledWindow::DoPrepareDC(wxDC& dc)
 517 {
 518     dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,
 519                         -m_yScrollPosition * m_yScrollPixelsPerLine );
 520 }
 521
 522 void wxScrolledWindow::SetScrollRate( int xstep, int ystep )
 523 {
 524     int old_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 525     int old_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 526
 527     m_xScrollPixelsPerLine = xstep;
 528     m_yScrollPixelsPerLine = ystep;
 529
 530     int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 531     int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 532
 533     m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
 534
 535     AdjustScrollbars();
 536 }
 537
 538 void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 539 {
 540     if ( x_unit )
 541         *x_unit = m_xScrollPixelsPerLine;
 542     if ( y_unit )
 543         *y_unit = m_yScrollPixelsPerLine;
 544 }
 545
 546 int wxScrolledWindow::GetScrollPageSize(int orient) const
 547 {
 548     if ( orient == wxHORIZONTAL )
 549         return m_xScrollLinesPerPage;
 550     else
 551         return m_yScrollLinesPerPage;
 552 }
 553
 554 void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
 555 {
 556     if ( orient == wxHORIZONTAL )
 557         m_xScrollLinesPerPage = pageSize;
 558     else
 559         m_yScrollLinesPerPage = pageSize;
 560 }
 561
 562 void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)
 563 {
 564     int orient = event.GetOrientation();
 565
 566     int nScrollInc = CalcScrollInc(event);
 567     if (nScrollInc == 0) return;
 568
 569     if (orient == wxHORIZONTAL)
 570     {
 571         int newPos = m_xScrollPosition + nScrollInc;
 572         SetScrollPos(wxHORIZONTAL, newPos, TRUE );
 573     }
 574     else
 575     {
 576         int newPos = m_yScrollPosition + nScrollInc;
 577         SetScrollPos(wxVERTICAL, newPos, TRUE );
 578     }
 579
 580     if (orient == wxHORIZONTAL)
 581     {
 582         m_xScrollPosition += nScrollInc;
 583     }
 584     else
 585     {
 586         m_yScrollPosition += nScrollInc;
 587     }
 588
 589     if (orient == wxHORIZONTAL)
 590     {
 591        if (m_xScrollingEnabled)
 592             m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
 593        else
 594             m_targetWindow->Refresh();
 595     }
 596     else
 597     {
 598         if (m_yScrollingEnabled)
 599             m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
 600         else
 601             m_targetWindow->Refresh();
 602     }
 603 }
 604
 605 void wxScrolledWindow::Scroll( int x_pos, int y_pos )
 606 {
 607     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 608
 609     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
 610         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
 611
 612     if ((x_pos != -1) && (m_xScrollPixelsPerLine))
 613     {
 614         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 615         if (max < 0) max = 0;
 616         if (x_pos > max) x_pos = max;
 617         if (x_pos < 0) x_pos = 0;
 618
 619         int old_x = m_xScrollPosition;
 620         m_xScrollPosition = x_pos;
 621         m_hAdjust->value = x_pos;
 622
 623         m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
 624
 625         // Just update the scrollbar, don't send any wxWidgets event
 626         GtkHDisconnectEvent();
 627         gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 628         GtkHConnectEvent();
 629     }
 630
 631     if ((y_pos != -1) && (m_yScrollPixelsPerLine))
 632     {
 633         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 634         if (max < 0) max = 0;
 635         if (y_pos > max) y_pos = max;
 636         if (y_pos < 0) y_pos = 0;
 637
 638         int old_y = m_yScrollPosition;
 639         m_yScrollPosition = y_pos;
 640         m_vAdjust->value = y_pos;
 641
 642         m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
 643
 644         // Just update the scrollbar, don't send any wxWidgets event
 645         GtkVDisconnectEvent();
 646         gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 647         GtkVConnectEvent();
 648     }
 649 }
 650
 651 // TODO: [VH]Scroll functions should be combined
 652
 653 void wxScrolledWindow::GtkVScroll( float value, unsigned int scroll_type )
 654 {
 655     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 656
 657     if (m_yScrollPixelsPerLine == 0)
 658         return;
 659
 660     int y_pos = (int)(value+0.5);
 661
 662     if (y_pos == m_yScrollPosition)
 663         return;
 664
 665     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 666
 667     wxScrollWinEvent event( command, y_pos, wxVERTICAL );
 668     event.SetEventObject( this );
 669     GetEventHandler()->ProcessEvent( event );
 670 }
 671
 672 void wxScrolledWindow::GtkHScroll( float value, unsigned int scroll_type )
 673 {
 674     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 675
 676     if (m_xScrollPixelsPerLine == 0)
 677         return;
 678
 679     int x_pos = (int)(value+0.5);
 680
 681     if (x_pos == m_xScrollPosition)
 682         return;
 683
 684     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 685
 686     wxScrollWinEvent event( command, x_pos, wxHORIZONTAL );
 687     event.SetEventObject( this );
 688     GetEventHandler()->ProcessEvent( event );
 689 }
 690
 691 void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
 692 {
 693     m_xScrollingEnabled = x_scroll;
 694     m_yScrollingEnabled = y_scroll;
 695 }
 696
 697 // Where the current view starts from
 698 void wxScrolledWindow::GetViewStart (int *x, int *y) const
 699 {
 700     if ( x )
 701         *x = m_xScrollPosition;
 702     if ( y )
 703         *y = m_yScrollPosition;
 704 }
 705
 706 void wxScrolledWindow::DoCalcScrolledPosition(int x, int y, int *xx, int *yy) const
 707 {
 708     int xs, ys;
 709     GetViewStart (& xs, & ys);
 710
 711     if ( xx )
 712         *xx = x - xs * m_xScrollPixelsPerLine;
 713     if ( yy )
 714         *yy = y - ys * m_yScrollPixelsPerLine;
 715 }
 716
 717 void wxScrolledWindow::DoCalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
 718 {
 719     int xs, ys;
 720     GetViewStart (& xs, & ys);
 721
 722     if ( xx )
 723         *xx = x + xs * m_xScrollPixelsPerLine;
 724     if ( yy )
 725         *yy = y + ys * m_yScrollPixelsPerLine;
 726 }
 727
 728 int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
 729 {
 730     int pos = event.GetPosition();
 731     int orient = event.GetOrientation();
 732
 733     int nScrollInc = 0;
 734     if (event.GetEventType() == wxEVT_SCROLLWIN_TOP)
 735     {
 736             if (orient == wxHORIZONTAL)
 737                 nScrollInc = - m_xScrollPosition;
 738             else
 739                 nScrollInc = - m_yScrollPosition;
 740     } else
 741     if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
 742     {
 743             if (orient == wxHORIZONTAL)
 744                 nScrollInc = GetVirtualSize().GetWidth() / m_xScrollPixelsPerLine - m_xScrollPosition;
 745             else
 746                 nScrollInc = GetVirtualSize().GetHeight() / m_yScrollPixelsPerLine - m_yScrollPosition;
 747     } else
 748     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
 749     {
 750             nScrollInc = -1;
 751     } else
 752     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN)
 753     {
 754             nScrollInc = 1;
 755     } else
 756     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEUP)
 757     {
 758             if (orient == wxHORIZONTAL)
 759                 nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
 760             else
 761                 nScrollInc = -GetScrollPageSize(wxVERTICAL);
 762     } else
 763     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEDOWN)
 764     {
 765             if (orient == wxHORIZONTAL)
 766                 nScrollInc = GetScrollPageSize(wxHORIZONTAL);
 767             else
 768                 nScrollInc = GetScrollPageSize(wxVERTICAL);
 769     } else
 770     if ((event.GetEventType() == wxEVT_SCROLLWIN_THUMBTRACK) ||
 771         (event.GetEventType() == wxEVT_SCROLLWIN_THUMBRELEASE))
 772     {
 773             if (orient == wxHORIZONTAL)
 774                 nScrollInc = pos - m_xScrollPosition;
 775             else
 776                 nScrollInc = pos - m_yScrollPosition;
 777     }
 778
 779     if (orient == wxHORIZONTAL)
 780     {
 781         if (m_xScrollPixelsPerLine > 0)
 782         {
 783             int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 784             if (max < 0) max = 0;
 785
 786             if ( (m_xScrollPosition + nScrollInc) < 0 )
 787                 nScrollInc = -m_xScrollPosition; // As -ve as we can go
 788             else if ( (m_xScrollPosition + nScrollInc) > max )
 789                 nScrollInc = max - m_xScrollPosition; // As +ve as we can go
 790         }
 791         else
 792             m_targetWindow->Refresh();
 793     }
 794     else
 795     {
 796         if (m_yScrollPixelsPerLine > 0)
 797         {
 798             int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 799             if (max < 0) max = 0;
 800
 801             if ( (m_yScrollPosition + nScrollInc) < 0 )
 802                 nScrollInc = -m_yScrollPosition; // As -ve as we can go
 803             else if ( (m_yScrollPosition + nScrollInc) > max )
 804                 nScrollInc = max - m_yScrollPosition; // As +ve as we can go
 805         }
 806         else
 807             m_targetWindow->Refresh();
 808     }
 809
 810     return nScrollInc;
 811 }
 812
 813 void wxScrolledWindow::SetScrollPos( int orient, int pos, bool refresh )
 814 {
 815     wxCHECK_RET( m_widget != NULL, wxT("invalid window") );
 816
 817     wxCHECK_RET( m_wxwindow != NULL, wxT("window needs client area for scrolling") );
 818
 819     if (orient == wxHORIZONTAL)
 820     {
 821         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 822         if (max < 0) max = 0;
 823
 824         if (pos > max) pos = 0;
 825         if (pos < 0) pos = 0;
 826
 827         if (pos == (int)(m_hAdjust->value+0.5)) return;
 828         m_hAdjust->value = pos;
 829     }
 830     else
 831     {
 832         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 833         if (max < 0) max = 0;
 834
 835         if (pos > max) pos = 0;
 836         if (pos < 0) pos = 0;
 837
 838         if (pos == (int)(m_vAdjust->value+0.5)) return;
 839         m_vAdjust->value = pos;
 840     }
 841
 842     if (m_wxwindow->window)
 843     {
 844         if (orient == wxHORIZONTAL)
 845         {
 846             // Just update the scrollbar, don't send any wxWidgets event
 847             GtkHDisconnectEvent();
 848             gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 849             GtkHConnectEvent();
 850         }
 851         else
 852         {
 853             // Just update the scrollbar, don't send any wxWidgets event
 854             GtkVDisconnectEvent();
 855             gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 856             GtkVConnectEvent();
 857         }
 858     }
 859 }
 860
 861 void wxScrolledWindow::GtkVConnectEvent()
 862 {
 863     gtk_signal_connect( GTK_OBJECT(m_vAdjust), "value_changed",
 864           (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 865 }
 866
 867 void wxScrolledWindow::GtkHConnectEvent()
 868 {
 869     gtk_signal_connect( GTK_OBJECT(m_hAdjust), "value_changed",
 870           (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 871 }
 872
 873 void wxScrolledWindow::GtkHDisconnectEvent()
 874 {
 875     gtk_signal_disconnect_by_func( GTK_OBJECT(m_hAdjust),
 876         (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 877 }
 878
 879 void wxScrolledWindow::GtkVDisconnectEvent()
 880 {
 881     gtk_signal_disconnect_by_func( GTK_OBJECT(m_vAdjust),
 882         (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 883 }
 884
 885 bool wxScrolledWindow::Layout()
 886 {
 887     if (GetSizer() && m_targetWindow == this)
 888     {
 889         // If we're the scroll target, take into account the
 890         // virtual size and scrolled position of the window.
 891
 892         int x, y, w, h;
 893         CalcScrolledPosition(0,0, &x,&y);
 894         GetVirtualSize(&w, &h);
 895         GetSizer()->SetDimension(x, y, w, h);
 896         return TRUE;
 897     }
 898     else
 899         return wxPanel::Layout();  // fall back to default for LayoutConstraints
 900 }
 901
 902 // ----------------------------------------------------------------------------
 903 // event handlers
 904 // ----------------------------------------------------------------------------
 905
 906 // Default OnSize resets scrollbars, if any
 907 void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 908 {
 909     if ( m_targetWindow->GetAutoLayout() )
 910     {
 911         wxSize size = m_targetWindow->GetBestVirtualSize();
 912
 913         // This will call ::Layout() and ::AdjustScrollbars()
 914         SetVirtualSize( size );
 915     }
 916     else
 917     {
 918         AdjustScrollbars();
 919     }
 920 }
 921
 922 // This calls OnDraw, having adjusted the origin according to the current
 923 // scroll position
 924 void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 925 {
 926     wxPaintDC dc(this);
 927     PrepareDC(dc);
 928
 929     OnDraw(dc);
 930 }
 931
 932 // kbd handling: notice that we use OnChar() and not OnKeyDown() for
 933 // compatibility here - if we used OnKeyDown(), the programs which process
 934 // arrows themselves in their OnChar() would never get the message and like
 935 // this they always have the priority
 936 void wxScrolledWindow::OnChar(wxKeyEvent& event)
 937 {
 938     int stx, sty,       // view origin
 939         szx, szy,       // view size (total)
 940         clix, cliy;     // view size (on screen)
 941
 942     GetViewStart(&stx, &sty);
 943     GetClientSize(&clix, &cliy);
 944     GetVirtualSize(&szx, &szy);
 945
 946     if( m_xScrollPixelsPerLine )
 947     {
 948         clix /= m_xScrollPixelsPerLine;
 949         szx /= m_xScrollPixelsPerLine;
 950     }
 951     else
 952     {
 953         clix = 0;
 954         szx = -1;
 955     }
 956     if( m_yScrollPixelsPerLine )
 957     {
 958         cliy /= m_yScrollPixelsPerLine;
 959         szy /= m_yScrollPixelsPerLine;
 960     }
 961     else
 962     {
 963         cliy = 0;
 964         szy = -1;
 965     }
 966
 967     int xScrollOld = GetScrollPos(wxHORIZONTAL),
 968         yScrollOld = GetScrollPos(wxVERTICAL);
 969
 970     int dsty;
 971     switch ( event.GetKeyCode() )
 972     {
 973         case WXK_PAGEUP:
 974         case WXK_PRIOR:
 975             dsty = sty - (5 * cliy / 6);
 976             Scroll(-1, (dsty == -1) ? 0 : dsty);
 977             break;
 978
 979         case WXK_PAGEDOWN:
 980         case WXK_NEXT:
 981             Scroll(-1, sty + (5 * cliy / 6));
 982             break;
 983
 984         case WXK_HOME:
 985             Scroll(0, event.ControlDown() ? 0 : -1);
 986             break;
 987
 988         case WXK_END:
 989             Scroll(szx - clix, event.ControlDown() ? szy - cliy : -1);
 990             break;
 991
 992         case WXK_UP:
 993             Scroll(-1, sty - 1);
 994             break;
 995
 996         case WXK_DOWN:
 997             Scroll(-1, sty + 1);
 998             break;
 999
1000         case WXK_LEFT:
1001             Scroll(stx - 1, -1);
1002             break;
1003
1004         case WXK_RIGHT:
1005             Scroll(stx + 1, -1);
1006             break;
1007
1008         default:
1009             // not for us
1010             event.Skip();
1011             return;
1012     }
1013
1014     int xScroll = GetScrollPos(wxHORIZONTAL);
1015     if ( xScroll != xScrollOld )
1016     {
1017         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, xScroll,
1018                                wxHORIZONTAL);
1019         event.SetEventObject(this);
1020         GetEventHandler()->ProcessEvent(event);
1021     }
1022
1023     int yScroll = GetScrollPos(wxVERTICAL);
1024     if ( yScroll != yScrollOld )
1025     {
1026         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, yScroll,
1027                                wxVERTICAL);
1028         event.SetEventObject(this);
1029         GetEventHandler()->ProcessEvent(event);
1030     }
1031 }
1032
1033
1034 // vi:sts=4:sw=4:et