src/gtk/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 extern "C" {
  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 //-----------------------------------------------------------------------------
  93 // "value_changed" from m_hAdjust
  94 //-----------------------------------------------------------------------------
  95
  96 extern "C" {
  97 static void gtk_scrolled_window_hscroll_callback( GtkAdjustment *adjust,
  98                                                   SCROLLBAR_CBACK_ARG
  99                                                   wxScrolledWindow *win )
 100 {
 101     if (g_isIdle)
 102         wxapp_install_idle_handler();
 103
 104     if (g_blockEventsOnDrag) return;
 105     if (!win->m_hasVMT) return;
 106
 107     win->GtkHScroll( adjust->value,
 108             GET_SCROLL_TYPE(GTK_SCROLLED_WINDOW(win->m_widget)->hscrollbar) );
 109 }
 110 }
 111
 112 //-----------------------------------------------------------------------------
 113 // "button_press_event" from scrollbar
 114 //-----------------------------------------------------------------------------
 115
 116 extern "C" {
 117 static gint gtk_scrollbar_button_press_callback( GtkRange *widget,
 118                                                  GdkEventButton *gdk_event,
 119                                                  wxWindowGTK *win)
 120 {
 121     if (g_isIdle)
 122         wxapp_install_idle_handler();
 123
 124     g_blockEventsOnScroll = TRUE;
 125
 126     // FIXME: there is no slider field any more, what was meant here?
 127 #ifndef __WXGTK20__
 128     win->m_isScrolling = (gdk_event->window == widget->slider);
 129 #endif
 130
 131     return FALSE;
 132 }
 133 }
 134
 135 //-----------------------------------------------------------------------------
 136 // "button_release_event" from scrollbar
 137 //-----------------------------------------------------------------------------
 138
 139 extern "C" {
 140 static gint gtk_scrollbar_button_release_callback( GtkRange *widget,
 141                                                    GdkEventButton *WXUNUSED(gdk_event),
 142                                                    wxWindowGTK *win)
 143 {
 144 //  don't test here as we can release the mouse while being over
 145 //  a different window than the slider
 146 //
 147 //    if (gdk_event->window != widget->slider) return FALSE;
 148
 149     g_blockEventsOnScroll = FALSE;
 150
 151     if (win->m_isScrolling)
 152     {
 153         wxEventType command = wxEVT_SCROLLWIN_THUMBRELEASE;
 154         int value = -1;
 155         int dir = -1;
 156
 157         GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(win->m_widget);
 158         if (widget == GTK_RANGE(scrolledWindow->hscrollbar))
 159         {
 160             value = (int)(win->m_hAdjust->value+0.5);
 161             dir = wxHORIZONTAL;
 162         }
 163         if (widget == GTK_RANGE(scrolledWindow->vscrollbar))
 164         {
 165             value = (int)(win->m_vAdjust->value+0.5);
 166             dir = wxVERTICAL;
 167         }
 168
 169         wxScrollWinEvent event( command, value, dir );
 170         event.SetEventObject( win );
 171         win->GetEventHandler()->ProcessEvent( event );
 172     }
 173
 174     win->m_isScrolling = FALSE;
 175
 176     return FALSE;
 177 }
 178 }
 179
 180 //-----------------------------------------------------------------------------
 181 // InsertChild for wxScrolledWindow
 182 //-----------------------------------------------------------------------------
 183
 184 static void wxInsertChildInScrolledWindow( wxWindow* parent, wxWindow* child )
 185 {
 186     // The window might have been scrolled already, do we
 187     // have to adapt the position.
 188     GtkPizza *pizza = GTK_PIZZA(parent->m_wxwindow);
 189     child->m_x += pizza->xoffset;
 190     child->m_y += pizza->yoffset;
 191
 192     gtk_pizza_put( GTK_PIZZA(parent->m_wxwindow),
 193                      GTK_WIDGET(child->m_widget),
 194                      child->m_x,
 195                      child->m_y,
 196                      child->m_width,
 197                      child->m_height );
 198 }
 199
 200 // ----------------------------------------------------------------------------
 201 // wxScrolledWindow creation
 202 // ----------------------------------------------------------------------------
 203
 204 void wxScrolledWindow::Init()
 205 {
 206     m_xScrollPixelsPerLine = 0;
 207     m_yScrollPixelsPerLine = 0;
 208     m_xScrollingEnabled = TRUE;
 209     m_yScrollingEnabled = TRUE;
 210     m_xScrollPosition = 0;
 211     m_yScrollPosition = 0;
 212     m_xScrollLinesPerPage = 0;
 213     m_yScrollLinesPerPage = 0;
 214     m_targetWindow = (wxWindow*) NULL;
 215     m_scaleX = 1.0;
 216     m_scaleY = 1.0;
 217     m_hasScrolling = TRUE;
 218 }
 219
 220 bool wxScrolledWindow::Create(wxWindow *parent,
 221                               wxWindowID id,
 222                               const wxPoint& pos,
 223                               const wxSize& size,
 224                               long style,
 225                               const wxString& name)
 226 {
 227     Init();
 228
 229     if (!PreCreation( parent, pos, size ) ||
 230         !CreateBase( parent, id, pos, size, style, wxDefaultValidator, name ))
 231     {
 232         wxFAIL_MSG( wxT("wxWindow creation failed") );
 233         return FALSE;
 234     }
 235
 236     m_insertCallback = wxInsertChildInScrolledWindow;
 237
 238     m_targetWindow = this;
 239
 240     m_widget = gtk_scrolled_window_new( (GtkAdjustment *) NULL, (GtkAdjustment *) NULL );
 241     GTK_WIDGET_UNSET_FLAGS( m_widget, GTK_CAN_FOCUS );
 242
 243     GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(m_widget);
 244
 245     GtkScrolledWindowClass *scroll_class = GTK_SCROLLED_WINDOW_CLASS( GTK_OBJECT_GET_CLASS(m_widget) );
 246     scroll_class->scrollbar_spacing = 0;
 247
 248     gtk_scrolled_window_set_policy( scrolledWindow, GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC );
 249
 250     m_hAdjust = gtk_range_get_adjustment( GTK_RANGE(scrolledWindow->hscrollbar) );
 251     m_vAdjust = gtk_range_get_adjustment( GTK_RANGE(scrolledWindow->vscrollbar) );
 252
 253     m_wxwindow = gtk_pizza_new();
 254
 255     gtk_container_add( GTK_CONTAINER(m_widget), m_wxwindow );
 256
 257     GtkPizza *pizza = GTK_PIZZA(m_wxwindow);
 258
 259     if (HasFlag(wxRAISED_BORDER))
 260     {
 261         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_OUT );
 262     }
 263     else if (HasFlag(wxSUNKEN_BORDER))
 264     {
 265         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_IN );
 266     }
 267     else if (HasFlag(wxSIMPLE_BORDER))
 268     {
 269         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_THIN );
 270     }
 271     else
 272     {
 273         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_NONE );
 274     }
 275
 276     GTK_WIDGET_SET_FLAGS( m_wxwindow, GTK_CAN_FOCUS );
 277     m_acceptsFocus = TRUE;
 278
 279     // I _really_ don't want scrollbars in the beginning
 280     m_vAdjust->lower = 0.0;
 281     m_vAdjust->upper = 1.0;
 282     m_vAdjust->value = 0.0;
 283     m_vAdjust->step_increment = 1.0;
 284     m_vAdjust->page_increment = 2.0;
 285     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 286     m_hAdjust->lower = 0.0;
 287     m_hAdjust->upper = 1.0;
 288     m_hAdjust->value = 0.0;
 289     m_hAdjust->step_increment = 1.0;
 290     m_hAdjust->page_increment = 2.0;
 291     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 292
 293     // Handlers for new scrollbar values
 294     GtkVConnectEvent();
 295     GtkHConnectEvent();
 296
 297     // these handlers block mouse events to any window during scrolling such as
 298     // motion events and prevent GTK and wxWidgets from fighting over where the
 299     // slider should be
 300
 301     gtk_signal_connect( GTK_OBJECT(scrolledWindow->vscrollbar), "button_press_event",
 302           (GtkSignalFunc)gtk_scrollbar_button_press_callback, (gpointer) this );
 303
 304     gtk_signal_connect( GTK_OBJECT(scrolledWindow->hscrollbar), "button_press_event",
 305           (GtkSignalFunc)gtk_scrollbar_button_press_callback, (gpointer) this );
 306
 307     gtk_signal_connect( GTK_OBJECT(scrolledWindow->vscrollbar), "button_release_event",
 308           (GtkSignalFunc)gtk_scrollbar_button_release_callback, (gpointer) this );
 309
 310     gtk_signal_connect( GTK_OBJECT(scrolledWindow->hscrollbar), "button_release_event",
 311           (GtkSignalFunc)gtk_scrollbar_button_release_callback, (gpointer) this );
 312
 313     gtk_widget_show( m_wxwindow );
 314
 315     if (m_parent)
 316         m_parent->DoAddChild( this );
 317
 318     m_focusWidget = m_wxwindow;
 319
 320     PostCreation();
 321
 322     Show( TRUE );
 323
 324     return TRUE;
 325 }
 326
 327 // ----------------------------------------------------------------------------
 328 // setting scrolling parameters
 329 // ----------------------------------------------------------------------------
 330
 331 void wxScrolledWindow::DoSetVirtualSize( int x, int y )
 332 {
 333     wxPanel::DoSetVirtualSize( x, y );
 334     AdjustScrollbars();
 335
 336     if (GetAutoLayout())
 337         Layout();
 338 }
 339
 340 // wxWindow's GetBestVirtualSize returns the actual window size,
 341 // whereas we want to return the virtual size
 342 wxSize wxScrolledWindow::GetBestVirtualSize() const
 343 {
 344     wxSize  clientSize( GetClientSize() );
 345     if (GetSizer())
 346     {
 347         wxSize minSize( GetSizer()->CalcMin() );
 348
 349         return wxSize( wxMax( clientSize.x, minSize.x ), wxMax( clientSize.y, minSize.y ) );
 350     }
 351     else
 352         return clientSize;
 353 }
 354
 355 // return the size best suited for the current window
 356 // (this isn't a virtual size, this is a sensible size for the window)
 357 wxSize wxScrolledWindow::DoGetBestSize() const
 358 {
 359     wxSize best;
 360
 361     if ( GetSizer() )
 362     {
 363         wxSize b = GetSizer()->GetMinSize();
 364
 365         // Only use the content to set the window size in the direction
 366         // where there's no scrolling; otherwise we're going to get a huge
 367         // window in the direction in which scrolling is enabled
 368         int ppuX, ppuY;
 369         GetScrollPixelsPerUnit(& ppuX, & ppuY);
 370
 371         wxSize minSize;
 372         if ( GetMinSize().IsFullySpecified() )
 373             minSize = GetMinSize();
 374         else
 375             minSize = GetSize();
 376
 377         if (ppuX > 0)
 378             b.x = minSize.x;
 379         if (ppuY > 0)
 380             b.y = minSize.y;
 381         best = b;
 382     }
 383     else
 384         return wxWindow::DoGetBestSize();
 385
 386     // Add any difference between size and client size
 387     wxSize diff = GetSize() - GetClientSize();
 388     best.x += wxMax(0, diff.x);
 389     best.y += wxMax(0, diff.y);
 390
 391     return best;
 392 }
 393
 394 /*
 395  * pixelsPerUnitX/pixelsPerUnitY: number of pixels per unit (e.g. pixels per text line)
 396  * noUnitsX/noUnitsY:        : no. units per scrollbar
 397  */
 398 void wxScrolledWindow::SetScrollbars( int pixelsPerUnitX, int pixelsPerUnitY,
 399                                       int noUnitsX, int noUnitsY,
 400                                       int xPos, int yPos, bool noRefresh )
 401 {
 402     int xs, ys;
 403     GetViewStart (& xs, & ys);
 404
 405     int old_x = m_xScrollPixelsPerLine * xs;
 406     int old_y = m_yScrollPixelsPerLine * ys;
 407
 408     m_xScrollPixelsPerLine = pixelsPerUnitX;
 409     m_yScrollPixelsPerLine = pixelsPerUnitY;
 410
 411     m_hAdjust->value = m_xScrollPosition = xPos;
 412     m_vAdjust->value = m_yScrollPosition = yPos;
 413
 414     // Setting hints here should arguably be deprecated, but without it
 415     // a sizer might override this manual scrollbar setting in old code.
 416     // m_targetWindow->SetVirtualSizeHints( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY );
 417
 418     int w = noUnitsX * pixelsPerUnitX;
 419     int h = noUnitsY * pixelsPerUnitY;
 420     m_targetWindow->SetVirtualSize( w ? w : wxDefaultCoord,
 421                                     h ? h : wxDefaultCoord);
 422
 423     if (!noRefresh)
 424     {
 425         int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 426         int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 427
 428         m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
 429     }
 430 }
 431
 432 void wxScrolledWindow::AdjustScrollbars()
 433 {
 434     int w, h;
 435     int vw, vh;
 436
 437     m_targetWindow->GetClientSize( &w, &h );
 438     m_targetWindow->GetVirtualSize( &vw, &vh );
 439
 440     if (m_xScrollPixelsPerLine == 0)
 441     {
 442         m_hAdjust->upper = 1.0;
 443         m_hAdjust->page_increment = 1.0;
 444         m_hAdjust->page_size = 1.0;
 445     }
 446     else
 447     {
 448         m_hAdjust->upper = (vw+m_xScrollPixelsPerLine-1) / m_xScrollPixelsPerLine;
 449         m_hAdjust->page_size = w / m_xScrollPixelsPerLine;
 450         m_hAdjust->page_increment = w / m_xScrollPixelsPerLine;
 451
 452         // Special case. When client and virtual size are very close but
 453         // the client is big enough, kill scrollbar.
 454
 455         if ((m_hAdjust->page_size < m_hAdjust->upper) && (w >= vw))
 456             m_hAdjust->page_size += 1.0;
 457
 458         // If the scrollbar hits the right side, move the window
 459         // right to keep it from over extending.
 460
 461         if ((m_hAdjust->value != 0.0) && (m_hAdjust->value + m_hAdjust->page_size > m_hAdjust->upper))
 462         {
 463             m_hAdjust->value = m_hAdjust->upper - m_hAdjust->page_size;
 464             if (m_hAdjust->value < 0.0)
 465                 m_hAdjust->value = 0.0;
 466
 467             if (GetChildren().GetCount() == 0)
 468                 m_xScrollPosition = (int)m_hAdjust->value; // This is enough without child windows
 469             else
 470                 gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" ); // Actually scroll window
 471         }
 472     }
 473
 474     if (m_yScrollPixelsPerLine == 0)
 475     {
 476         m_vAdjust->upper = 1.0;
 477         m_vAdjust->page_increment = 1.0;
 478         m_vAdjust->page_size = 1.0;
 479     }
 480     else
 481     {
 482         m_vAdjust->upper = (vh+m_yScrollPixelsPerLine-1) / m_yScrollPixelsPerLine;
 483         m_vAdjust->page_size = h / m_yScrollPixelsPerLine;
 484         m_vAdjust->page_increment = h / m_yScrollPixelsPerLine;
 485
 486         if ((m_vAdjust->page_size < m_vAdjust->upper) && (h >= vh))
 487             m_vAdjust->page_size += 1.0;
 488
 489         if ((m_vAdjust->value != 0.0) && (m_vAdjust->value + m_vAdjust->page_size > m_vAdjust->upper))
 490         {
 491             m_vAdjust->value = m_vAdjust->upper - m_vAdjust->page_size;
 492             if (m_vAdjust->value < 0.0)
 493                 m_vAdjust->value = 0.0;
 494
 495             if (GetChildren().GetCount() == 0)
 496                 m_yScrollPosition = (int)m_vAdjust->value;
 497             else
 498                 gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 499         }
 500     }
 501
 502     m_xScrollLinesPerPage = (int)(m_hAdjust->page_increment + 0.5);
 503     m_yScrollLinesPerPage = (int)(m_vAdjust->page_increment + 0.5);
 504
 505     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 506     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 507 }
 508
 509
 510 // ----------------------------------------------------------------------------
 511 // target window handling
 512 // ----------------------------------------------------------------------------
 513
 514 void wxScrolledWindow::SetTargetWindow( wxWindow *target, bool WXUNUSED(pushEventHandler) )
 515 {
 516     wxASSERT_MSG( target, wxT("target window must not be NULL") );
 517     m_targetWindow = target;
 518 }
 519
 520 wxWindow *wxScrolledWindow::GetTargetWindow() const
 521 {
 522     return m_targetWindow;
 523 }
 524
 525 // Override this function if you don't want to have wxScrolledWindow
 526 // automatically change the origin according to the scroll position.
 527 void wxScrolledWindow::DoPrepareDC(wxDC& dc)
 528 {
 529     dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,
 530                         -m_yScrollPosition * m_yScrollPixelsPerLine );
 531 }
 532
 533 void wxScrolledWindow::SetScrollRate( int xstep, int ystep )
 534 {
 535     int old_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 536     int old_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 537
 538     m_xScrollPixelsPerLine = xstep;
 539     m_yScrollPixelsPerLine = ystep;
 540
 541     int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 542     int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 543
 544     m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
 545
 546     AdjustScrollbars();
 547 }
 548
 549 void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 550 {
 551     if ( x_unit )
 552         *x_unit = m_xScrollPixelsPerLine;
 553     if ( y_unit )
 554         *y_unit = m_yScrollPixelsPerLine;
 555 }
 556
 557 int wxScrolledWindow::GetScrollPageSize(int orient) const
 558 {
 559     if ( orient == wxHORIZONTAL )
 560         return m_xScrollLinesPerPage;
 561     else
 562         return m_yScrollLinesPerPage;
 563 }
 564
 565 void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
 566 {
 567     if ( orient == wxHORIZONTAL )
 568         m_xScrollLinesPerPage = pageSize;
 569     else
 570         m_yScrollLinesPerPage = pageSize;
 571 }
 572
 573 void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)
 574 {
 575     int orient = event.GetOrientation();
 576
 577     int nScrollInc = CalcScrollInc(event);
 578     if (nScrollInc == 0) return;
 579
 580     if (orient == wxHORIZONTAL)
 581     {
 582         int newPos = m_xScrollPosition + nScrollInc;
 583         SetScrollPos(wxHORIZONTAL, newPos, TRUE );
 584     }
 585     else
 586     {
 587         int newPos = m_yScrollPosition + nScrollInc;
 588         SetScrollPos(wxVERTICAL, newPos, TRUE );
 589     }
 590
 591     if (orient == wxHORIZONTAL)
 592     {
 593         m_xScrollPosition += nScrollInc;
 594     }
 595     else
 596     {
 597         m_yScrollPosition += nScrollInc;
 598     }
 599
 600     if (orient == wxHORIZONTAL)
 601     {
 602        if (m_xScrollingEnabled)
 603             m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
 604        else
 605             m_targetWindow->Refresh();
 606     }
 607     else
 608     {
 609         if (m_yScrollingEnabled)
 610             m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
 611         else
 612             m_targetWindow->Refresh();
 613     }
 614 }
 615
 616 void wxScrolledWindow::Scroll( int x_pos, int y_pos )
 617 {
 618     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 619
 620     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
 621         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
 622
 623     if ((x_pos != -1) && (m_xScrollPixelsPerLine))
 624     {
 625         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 626         if (max < 0) max = 0;
 627         if (x_pos > max) x_pos = max;
 628         if (x_pos < 0) x_pos = 0;
 629
 630         int old_x = m_xScrollPosition;
 631         m_xScrollPosition = x_pos;
 632         m_hAdjust->value = x_pos;
 633
 634         m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
 635
 636         // Just update the scrollbar, don't send any wxWidgets event
 637         GtkHDisconnectEvent();
 638         gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 639         GtkHConnectEvent();
 640     }
 641
 642     if ((y_pos != -1) && (m_yScrollPixelsPerLine))
 643     {
 644         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 645         if (max < 0) max = 0;
 646         if (y_pos > max) y_pos = max;
 647         if (y_pos < 0) y_pos = 0;
 648
 649         int old_y = m_yScrollPosition;
 650         m_yScrollPosition = y_pos;
 651         m_vAdjust->value = y_pos;
 652
 653         m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
 654
 655         // Just update the scrollbar, don't send any wxWidgets event
 656         GtkVDisconnectEvent();
 657         gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 658         GtkVConnectEvent();
 659     }
 660 }
 661
 662 // TODO: [VH]Scroll functions should be combined
 663
 664 void wxScrolledWindow::GtkVScroll( float value, unsigned int scroll_type )
 665 {
 666     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 667
 668     if (m_yScrollPixelsPerLine == 0)
 669         return;
 670
 671     int y_pos = (int)(value+0.5);
 672
 673     if (y_pos == m_yScrollPosition)
 674         return;
 675
 676     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 677
 678     wxScrollWinEvent event( command, y_pos, wxVERTICAL );
 679     event.SetEventObject( this );
 680     GetEventHandler()->ProcessEvent( event );
 681 }
 682
 683 void wxScrolledWindow::GtkHScroll( float value, unsigned int scroll_type )
 684 {
 685     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 686
 687     if (m_xScrollPixelsPerLine == 0)
 688         return;
 689
 690     int x_pos = (int)(value+0.5);
 691
 692     if (x_pos == m_xScrollPosition)
 693         return;
 694
 695     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 696
 697     wxScrollWinEvent event( command, x_pos, wxHORIZONTAL );
 698     event.SetEventObject( this );
 699     GetEventHandler()->ProcessEvent( event );
 700 }
 701
 702 void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
 703 {
 704     m_xScrollingEnabled = x_scroll;
 705     m_yScrollingEnabled = y_scroll;
 706 }
 707
 708 // Where the current view starts from
 709 void wxScrolledWindow::GetViewStart (int *x, int *y) const
 710 {
 711     if ( x )
 712         *x = m_xScrollPosition;
 713     if ( y )
 714         *y = m_yScrollPosition;
 715 }
 716
 717 void wxScrolledWindow::DoCalcScrolledPosition(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 void wxScrolledWindow::DoCalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
 729 {
 730     int xs, ys;
 731     GetViewStart (& xs, & ys);
 732
 733     if ( xx )
 734         *xx = x + xs * m_xScrollPixelsPerLine;
 735     if ( yy )
 736         *yy = y + ys * m_yScrollPixelsPerLine;
 737 }
 738
 739 int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
 740 {
 741     int pos = event.GetPosition();
 742     int orient = event.GetOrientation();
 743
 744     int nScrollInc = 0;
 745     if (event.GetEventType() == wxEVT_SCROLLWIN_TOP)
 746     {
 747             if (orient == wxHORIZONTAL)
 748                 nScrollInc = - m_xScrollPosition;
 749             else
 750                 nScrollInc = - m_yScrollPosition;
 751     } else
 752     if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
 753     {
 754             if (orient == wxHORIZONTAL)
 755                 nScrollInc = GetVirtualSize().GetWidth() / m_xScrollPixelsPerLine - m_xScrollPosition;
 756             else
 757                 nScrollInc = GetVirtualSize().GetHeight() / m_yScrollPixelsPerLine - m_yScrollPosition;
 758     } else
 759     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
 760     {
 761             nScrollInc = -1;
 762     } else
 763     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN)
 764     {
 765             nScrollInc = 1;
 766     } else
 767     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEUP)
 768     {
 769             if (orient == wxHORIZONTAL)
 770                 nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
 771             else
 772                 nScrollInc = -GetScrollPageSize(wxVERTICAL);
 773     } else
 774     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEDOWN)
 775     {
 776             if (orient == wxHORIZONTAL)
 777                 nScrollInc = GetScrollPageSize(wxHORIZONTAL);
 778             else
 779                 nScrollInc = GetScrollPageSize(wxVERTICAL);
 780     } else
 781     if ((event.GetEventType() == wxEVT_SCROLLWIN_THUMBTRACK) ||
 782         (event.GetEventType() == wxEVT_SCROLLWIN_THUMBRELEASE))
 783     {
 784             if (orient == wxHORIZONTAL)
 785                 nScrollInc = pos - m_xScrollPosition;
 786             else
 787                 nScrollInc = pos - m_yScrollPosition;
 788     }
 789
 790     if (orient == wxHORIZONTAL)
 791     {
 792         if (m_xScrollPixelsPerLine > 0)
 793         {
 794             int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 795             if (max < 0) max = 0;
 796
 797             if ( (m_xScrollPosition + nScrollInc) < 0 )
 798                 nScrollInc = -m_xScrollPosition; // As -ve as we can go
 799             else if ( (m_xScrollPosition + nScrollInc) > max )
 800                 nScrollInc = max - m_xScrollPosition; // As +ve as we can go
 801         }
 802         else
 803             m_targetWindow->Refresh();
 804     }
 805     else
 806     {
 807         if (m_yScrollPixelsPerLine > 0)
 808         {
 809             int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 810             if (max < 0) max = 0;
 811
 812             if ( (m_yScrollPosition + nScrollInc) < 0 )
 813                 nScrollInc = -m_yScrollPosition; // As -ve as we can go
 814             else if ( (m_yScrollPosition + nScrollInc) > max )
 815                 nScrollInc = max - m_yScrollPosition; // As +ve as we can go
 816         }
 817         else
 818             m_targetWindow->Refresh();
 819     }
 820
 821     return nScrollInc;
 822 }
 823
 824 void wxScrolledWindow::SetScrollPos( int orient, int pos, bool refresh )
 825 {
 826     wxCHECK_RET( m_widget != NULL, wxT("invalid window") );
 827
 828     wxCHECK_RET( m_wxwindow != NULL, wxT("window needs client area for scrolling") );
 829
 830     if (orient == wxHORIZONTAL)
 831     {
 832         int max = (int)(m_hAdjust->upper - m_hAdjust->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_hAdjust->value+0.5)) return;
 839         m_hAdjust->value = pos;
 840     }
 841     else
 842     {
 843         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 844         if (max < 0) max = 0;
 845
 846         if (pos > max) pos = 0;
 847         if (pos < 0) pos = 0;
 848
 849         if (pos == (int)(m_vAdjust->value+0.5)) return;
 850         m_vAdjust->value = pos;
 851     }
 852
 853     if (m_wxwindow->window)
 854     {
 855         if (orient == wxHORIZONTAL)
 856         {
 857             // Just update the scrollbar, don't send any wxWidgets event
 858             GtkHDisconnectEvent();
 859             gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 860             GtkHConnectEvent();
 861         }
 862         else
 863         {
 864             // Just update the scrollbar, don't send any wxWidgets event
 865             GtkVDisconnectEvent();
 866             gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 867             GtkVConnectEvent();
 868         }
 869     }
 870 }
 871
 872 void wxScrolledWindow::GtkVConnectEvent()
 873 {
 874     gtk_signal_connect( GTK_OBJECT(m_vAdjust), "value_changed",
 875           (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 876 }
 877
 878 void wxScrolledWindow::GtkHConnectEvent()
 879 {
 880     gtk_signal_connect( GTK_OBJECT(m_hAdjust), "value_changed",
 881           (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 882 }
 883
 884 void wxScrolledWindow::GtkHDisconnectEvent()
 885 {
 886     gtk_signal_disconnect_by_func( GTK_OBJECT(m_hAdjust),
 887         (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 888 }
 889
 890 void wxScrolledWindow::GtkVDisconnectEvent()
 891 {
 892     gtk_signal_disconnect_by_func( GTK_OBJECT(m_vAdjust),
 893         (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 894 }
 895
 896 bool wxScrolledWindow::Layout()
 897 {
 898     if (GetSizer() && m_targetWindow == this)
 899     {
 900         // If we're the scroll target, take into account the
 901         // virtual size and scrolled position of the window.
 902
 903         int x, y, w, h;
 904         CalcScrolledPosition(0,0, &x,&y);
 905         GetVirtualSize(&w, &h);
 906         GetSizer()->SetDimension(x, y, w, h);
 907         return TRUE;
 908     }
 909     else
 910         return wxPanel::Layout();  // fall back to default for LayoutConstraints
 911 }
 912
 913 // ----------------------------------------------------------------------------
 914 // event handlers
 915 // ----------------------------------------------------------------------------
 916
 917 // Default OnSize resets scrollbars, if any
 918 void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 919 {
 920     if ( m_targetWindow->GetAutoLayout() )
 921     {
 922         wxSize size = m_targetWindow->GetBestVirtualSize();
 923
 924         // This will call ::Layout() and ::AdjustScrollbars()
 925         SetVirtualSize( size );
 926     }
 927     else
 928     {
 929         AdjustScrollbars();
 930     }
 931 }
 932
 933 // This calls OnDraw, having adjusted the origin according to the current
 934 // scroll position
 935 void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 936 {
 937     wxPaintDC dc(this);
 938     PrepareDC(dc);
 939
 940     OnDraw(dc);
 941 }
 942
 943 // kbd handling: notice that we use OnChar() and not OnKeyDown() for
 944 // compatibility here - if we used OnKeyDown(), the programs which process
 945 // arrows themselves in their OnChar() would never get the message and like
 946 // this they always have the priority
 947 void wxScrolledWindow::OnChar(wxKeyEvent& event)
 948 {
 949     int stx, sty,       // view origin
 950         szx, szy,       // view size (total)
 951         clix, cliy;     // view size (on screen)
 952
 953     GetViewStart(&stx, &sty);
 954     GetClientSize(&clix, &cliy);
 955     GetVirtualSize(&szx, &szy);
 956
 957     if( m_xScrollPixelsPerLine )
 958     {
 959         clix /= m_xScrollPixelsPerLine;
 960         szx /= m_xScrollPixelsPerLine;
 961     }
 962     else
 963     {
 964         clix = 0;
 965         szx = -1;
 966     }
 967     if( m_yScrollPixelsPerLine )
 968     {
 969         cliy /= m_yScrollPixelsPerLine;
 970         szy /= m_yScrollPixelsPerLine;
 971     }
 972     else
 973     {
 974         cliy = 0;
 975         szy = -1;
 976     }
 977
 978     int xScrollOld = GetScrollPos(wxHORIZONTAL),
 979         yScrollOld = GetScrollPos(wxVERTICAL);
 980
 981     int dsty;
 982     switch ( event.GetKeyCode() )
 983     {
 984         case WXK_PAGEUP:
 985         case WXK_PRIOR:
 986             dsty = sty - (5 * cliy / 6);
 987             Scroll(-1, (dsty == -1) ? 0 : dsty);
 988             break;
 989
 990         case WXK_PAGEDOWN:
 991         case WXK_NEXT:
 992             Scroll(-1, sty + (5 * cliy / 6));
 993             break;
 994
 995         case WXK_HOME:
 996             Scroll(0, event.ControlDown() ? 0 : -1);
 997             break;
 998
 999         case WXK_END:
1000             Scroll(szx - clix, event.ControlDown() ? szy - cliy : -1);
1001             break;
1002
1003         case WXK_UP:
1004             Scroll(-1, sty - 1);
1005             break;
1006
1007         case WXK_DOWN:
1008             Scroll(-1, sty + 1);
1009             break;
1010
1011         case WXK_LEFT:
1012             Scroll(stx - 1, -1);
1013             break;
1014
1015         case WXK_RIGHT:
1016             Scroll(stx + 1, -1);
1017             break;
1018
1019         default:
1020             // not for us
1021             event.Skip();
1022             return;
1023     }
1024
1025     int xScroll = GetScrollPos(wxHORIZONTAL);
1026     if ( xScroll != xScrollOld )
1027     {
1028         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, xScroll,
1029                                wxHORIZONTAL);
1030         event.SetEventObject(this);
1031         GetEventHandler()->ProcessEvent(event);
1032     }
1033
1034     int yScroll = GetScrollPos(wxVERTICAL);
1035     if ( yScroll != yScrollOld )
1036     {
1037         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, yScroll,
1038                                wxVERTICAL);
1039         event.SetEventObject(this);
1040         GetEventHandler()->ProcessEvent(event);
1041     }
1042 }
1043
1044
1045 // vi:sts=4:sw=4:et