src/gtk1/scrolwin.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        gtk/scrolwin.cpp
   3 // Purpose:     wxScrolledWindow implementation
   4 // Author:      Julian Smart
   5 // Modified by: Ron Lee
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21     #pragma implementation "scrolwin.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #include "wx/utils.h"
  32 #include "wx/dcclient.h"
  33
  34 #include "wx/scrolwin.h"
  35 #include "wx/panel.h"
  36 #include "wx/sizer.h"
  37
  38 #include "wx/gtk/private.h"
  39 #include "wx/gtk/win_gtk.h"
  40
  41 // ----------------------------------------------------------------------------
  42 // event tables
  43 // ----------------------------------------------------------------------------
  44
  45 BEGIN_EVENT_TABLE(wxScrolledWindow, wxPanel)
  46     EVT_SCROLLWIN(wxScrolledWindow::OnScroll)
  47     EVT_SIZE(wxScrolledWindow::OnSize)
  48     EVT_PAINT(wxScrolledWindow::OnPaint)
  49     EVT_CHAR(wxScrolledWindow::OnChar)
  50 END_EVENT_TABLE()
  51
  52 IMPLEMENT_DYNAMIC_CLASS(wxScrolledWindow, wxPanel)
  53
  54 // ============================================================================
  55 // implementation
  56 // ============================================================================
  57
  58 //-----------------------------------------------------------------------------
  59 // data
  60 //-----------------------------------------------------------------------------
  61
  62 extern bool       g_blockEventsOnDrag;
  63 extern bool       g_blockEventsOnScroll;
  64
  65 //-----------------------------------------------------------------------------
  66 // idle system
  67 //-----------------------------------------------------------------------------
  68
  69 extern void wxapp_install_idle_handler();
  70 extern bool g_isIdle;
  71
  72 //-----------------------------------------------------------------------------
  73 // "value_changed" from m_vAdjust
  74 //-----------------------------------------------------------------------------
  75
  76 static void gtk_scrolled_window_vscroll_callback( GtkAdjustment *adjust,
  77                                                   SCROLLBAR_CBACK_ARG
  78                                                   wxScrolledWindow *win )
  79 {
  80     if (g_isIdle)
  81         wxapp_install_idle_handler();
  82
  83     if (g_blockEventsOnDrag) return;
  84
  85     if (!win->m_hasVMT) return;
  86
  87     win->GtkVScroll( adjust->value,
  88             GET_SCROLL_TYPE(GTK_SCROLLED_WINDOW(win->m_widget)->vscrollbar) );
  89 }
  90
  91 //-----------------------------------------------------------------------------
  92 // "value_changed" from m_hAdjust
  93 //-----------------------------------------------------------------------------
  94
  95 static void gtk_scrolled_window_hscroll_callback( GtkAdjustment *adjust,
  96                                                   SCROLLBAR_CBACK_ARG
  97                                                   wxScrolledWindow *win )
  98 {
  99     if (g_isIdle)
 100         wxapp_install_idle_handler();
 101
 102     if (g_blockEventsOnDrag) return;
 103     if (!win->m_hasVMT) return;
 104
 105     win->GtkHScroll( adjust->value,
 106             GET_SCROLL_TYPE(GTK_SCROLLED_WINDOW(win->m_widget)->hscrollbar) );
 107 }
 108
 109 //-----------------------------------------------------------------------------
 110 // "button_press_event" from scrollbar
 111 //-----------------------------------------------------------------------------
 112
 113 static gint gtk_scrollbar_button_press_callback( GtkRange *widget,
 114                                                  GdkEventButton *gdk_event,
 115                                                  wxWindowGTK *win)
 116 {
 117     if (g_isIdle)
 118         wxapp_install_idle_handler();
 119
 120     g_blockEventsOnScroll = TRUE;
 121
 122     // FIXME: there is no slider field any more, what was meant here?
 123 #ifndef __WXGTK20__
 124     win->m_isScrolling = (gdk_event->window == widget->slider);
 125 #endif
 126
 127     return FALSE;
 128 }
 129
 130 //-----------------------------------------------------------------------------
 131 // "button_release_event" from scrollbar
 132 //-----------------------------------------------------------------------------
 133
 134 static gint gtk_scrollbar_button_release_callback( GtkRange *widget,
 135                                                    GdkEventButton *WXUNUSED(gdk_event),
 136                                                    wxWindowGTK *win)
 137 {
 138 //  don't test here as we can release the mouse while being over
 139 //  a different window than the slider
 140 //
 141 //    if (gdk_event->window != widget->slider) return FALSE;
 142
 143     g_blockEventsOnScroll = FALSE;
 144
 145     if (win->m_isScrolling)
 146     {
 147         wxEventType command = wxEVT_SCROLLWIN_THUMBRELEASE;
 148         int value = -1;
 149         int dir = -1;
 150
 151         GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(win->m_widget);
 152         if (widget == GTK_RANGE(scrolledWindow->hscrollbar))
 153         {
 154             value = (int)(win->m_hAdjust->value+0.5);
 155             dir = wxHORIZONTAL;
 156         }
 157         if (widget == GTK_RANGE(scrolledWindow->vscrollbar))
 158         {
 159             value = (int)(win->m_vAdjust->value+0.5);
 160             dir = wxVERTICAL;
 161         }
 162
 163         wxScrollWinEvent event( command, value, dir );
 164         event.SetEventObject( win );
 165         win->GetEventHandler()->ProcessEvent( event );
 166     }
 167
 168     win->m_isScrolling = FALSE;
 169
 170     return FALSE;
 171 }
 172
 173 //-----------------------------------------------------------------------------
 174 // InsertChild for wxScrolledWindow
 175 //-----------------------------------------------------------------------------
 176
 177 static void wxInsertChildInScrolledWindow( wxWindow* parent, wxWindow* child )
 178 {
 179     // The window might have been scrolled already, do we
 180     // have to adapt the position.
 181     GtkPizza *pizza = GTK_PIZZA(parent->m_wxwindow);
 182     child->m_x += pizza->xoffset;
 183     child->m_y += pizza->yoffset;
 184
 185     gtk_pizza_put( GTK_PIZZA(parent->m_wxwindow),
 186                      GTK_WIDGET(child->m_widget),
 187                      child->m_x,
 188                      child->m_y,
 189                      child->m_width,
 190                      child->m_height );
 191 }
 192
 193 // ----------------------------------------------------------------------------
 194 // wxScrolledWindow creation
 195 // ----------------------------------------------------------------------------
 196
 197 void wxScrolledWindow::Init()
 198 {
 199     m_xScrollPixelsPerLine = 0;
 200     m_yScrollPixelsPerLine = 0;
 201     m_xScrollingEnabled = TRUE;
 202     m_yScrollingEnabled = TRUE;
 203     m_xScrollPosition = 0;
 204     m_yScrollPosition = 0;
 205     m_xScrollLinesPerPage = 0;
 206     m_yScrollLinesPerPage = 0;
 207     m_targetWindow = (wxWindow*) NULL;
 208     m_scaleX = 1.0;
 209     m_scaleY = 1.0;
 210     m_hasScrolling = TRUE;
 211 }
 212
 213 bool wxScrolledWindow::Create(wxWindow *parent,
 214                               wxWindowID id,
 215                               const wxPoint& pos,
 216                               const wxSize& size,
 217                               long style,
 218                               const wxString& name)
 219 {
 220     Init();
 221
 222     if (!PreCreation( parent, pos, size ) ||
 223         !CreateBase( parent, id, pos, size, style, wxDefaultValidator, name ))
 224     {
 225         wxFAIL_MSG( wxT("wxWindow creation failed") );
 226         return FALSE;
 227     }
 228
 229     m_insertCallback = wxInsertChildInScrolledWindow;
 230
 231     m_targetWindow = this;
 232
 233     m_widget = gtk_scrolled_window_new( (GtkAdjustment *) NULL, (GtkAdjustment *) NULL );
 234     GTK_WIDGET_UNSET_FLAGS( m_widget, GTK_CAN_FOCUS );
 235
 236     GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(m_widget);
 237
 238     GtkScrolledWindowClass *scroll_class = GTK_SCROLLED_WINDOW_CLASS( GTK_OBJECT_GET_CLASS(m_widget) );
 239     scroll_class->scrollbar_spacing = 0;
 240
 241     gtk_scrolled_window_set_policy( scrolledWindow, GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC );
 242
 243     m_hAdjust = gtk_range_get_adjustment( GTK_RANGE(scrolledWindow->hscrollbar) );
 244     m_vAdjust = gtk_range_get_adjustment( GTK_RANGE(scrolledWindow->vscrollbar) );
 245
 246     m_wxwindow = gtk_pizza_new();
 247
 248     gtk_container_add( GTK_CONTAINER(m_widget), m_wxwindow );
 249
 250     GtkPizza *pizza = GTK_PIZZA(m_wxwindow);
 251
 252     if (HasFlag(wxRAISED_BORDER))
 253     {
 254         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_OUT );
 255     }
 256     else if (HasFlag(wxSUNKEN_BORDER))
 257     {
 258         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_IN );
 259     }
 260     else if (HasFlag(wxSIMPLE_BORDER))
 261     {
 262         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_THIN );
 263     }
 264     else
 265     {
 266         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_NONE );
 267     }
 268
 269     GTK_WIDGET_SET_FLAGS( m_wxwindow, GTK_CAN_FOCUS );
 270     m_acceptsFocus = TRUE;
 271
 272     // I _really_ don't want scrollbars in the beginning
 273     m_vAdjust->lower = 0.0;
 274     m_vAdjust->upper = 1.0;
 275     m_vAdjust->value = 0.0;
 276     m_vAdjust->step_increment = 1.0;
 277     m_vAdjust->page_increment = 2.0;
 278     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 279     m_hAdjust->lower = 0.0;
 280     m_hAdjust->upper = 1.0;
 281     m_hAdjust->value = 0.0;
 282     m_hAdjust->step_increment = 1.0;
 283     m_hAdjust->page_increment = 2.0;
 284     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 285
 286     // Handlers for new scrollbar values
 287     GtkVConnectEvent();
 288     GtkHConnectEvent();
 289
 290     // these handlers block mouse events to any window during scrolling such as
 291     // motion events and prevent GTK and wxWindows from fighting over where the
 292     // slider should be
 293
 294     gtk_signal_connect( GTK_OBJECT(scrolledWindow->vscrollbar), "button_press_event",
 295           (GtkSignalFunc)gtk_scrollbar_button_press_callback, (gpointer) this );
 296
 297     gtk_signal_connect( GTK_OBJECT(scrolledWindow->hscrollbar), "button_press_event",
 298           (GtkSignalFunc)gtk_scrollbar_button_press_callback, (gpointer) this );
 299
 300     gtk_signal_connect( GTK_OBJECT(scrolledWindow->vscrollbar), "button_release_event",
 301           (GtkSignalFunc)gtk_scrollbar_button_release_callback, (gpointer) this );
 302
 303     gtk_signal_connect( GTK_OBJECT(scrolledWindow->hscrollbar), "button_release_event",
 304           (GtkSignalFunc)gtk_scrollbar_button_release_callback, (gpointer) this );
 305
 306     gtk_widget_show( m_wxwindow );
 307
 308     if (m_parent)
 309         m_parent->DoAddChild( this );
 310
 311     m_focusWidget = m_wxwindow;
 312
 313     PostCreation();
 314
 315     Show( TRUE );
 316
 317     return TRUE;
 318 }
 319
 320 // ----------------------------------------------------------------------------
 321 // setting scrolling parameters
 322 // ----------------------------------------------------------------------------
 323
 324 void wxScrolledWindow::DoSetVirtualSize( int x, int y )
 325 {
 326     wxPanel::DoSetVirtualSize( x, y );
 327     AdjustScrollbars();
 328
 329 #if wxUSE_CONSTRAINTS
 330     if (GetAutoLayout())
 331         Layout();
 332 #endif
 333 }
 334
 335 /*
 336  * pixelsPerUnitX/pixelsPerUnitY: number of pixels per unit (e.g. pixels per text line)
 337  * noUnitsX/noUnitsY:        : no. units per scrollbar
 338  */
 339 void wxScrolledWindow::SetScrollbars( int pixelsPerUnitX, int pixelsPerUnitY,
 340                                       int noUnitsX, int noUnitsY,
 341                                       int xPos, int yPos, bool noRefresh )
 342 {
 343     int old_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 344     int old_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 345
 346     m_xScrollPixelsPerLine = pixelsPerUnitX;
 347     m_yScrollPixelsPerLine = pixelsPerUnitY;
 348
 349     m_hAdjust->value = m_xScrollPosition = xPos;
 350     m_vAdjust->value = m_yScrollPosition = yPos;
 351
 352     // Setting hints here should arguably be deprecated, but without it
 353     // a sizer might override this manual scrollbar setting in old code.
 354     m_targetWindow->SetVirtualSizeHints( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY );
 355
 356     m_targetWindow->SetVirtualSize( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY );
 357
 358     if (!noRefresh)
 359     {
 360         int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 361         int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 362
 363         m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
 364     }
 365 }
 366
 367 void wxScrolledWindow::AdjustScrollbars()
 368 {
 369     int w, h;
 370     int vw, vh;
 371
 372     m_targetWindow->GetClientSize( &w, &h );
 373     m_targetWindow->GetVirtualSize( &vw, &vh );
 374
 375     if (m_xScrollPixelsPerLine == 0)
 376     {
 377         m_hAdjust->upper = 1.0;
 378         m_hAdjust->page_size = 1.0;
 379     }
 380     else
 381     {
 382         m_hAdjust->upper = vw / m_xScrollPixelsPerLine;
 383         m_hAdjust->page_size = (w / m_xScrollPixelsPerLine);
 384
 385         // If the scrollbar hits the right side, move the window
 386         // right to keep it from over extending.
 387
 388         if ((m_hAdjust->value != 0.0) && (m_hAdjust->value + m_hAdjust->page_size > m_hAdjust->upper))
 389         {
 390             m_hAdjust->value = m_hAdjust->upper - m_hAdjust->page_size;
 391             if (m_hAdjust->value < 0.0)
 392                 m_hAdjust->value = 0.0;
 393
 394             if (GetChildren().GetCount() == 0)
 395                 m_xScrollPosition = (int)m_hAdjust->value; // This is enough without child windows
 396             else
 397                 gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" ); // Actually scroll window
 398         }
 399     }
 400
 401     if (m_yScrollPixelsPerLine == 0)
 402     {
 403         m_vAdjust->upper = 1.0;
 404         m_vAdjust->page_size = 1.0;
 405     }
 406     else
 407     {
 408         m_vAdjust->upper = vh / m_yScrollPixelsPerLine;
 409         m_vAdjust->page_size = (h / m_yScrollPixelsPerLine);
 410
 411         if ((m_vAdjust->value != 0.0) && (m_vAdjust->value + m_vAdjust->page_size > m_vAdjust->upper))
 412         {
 413             m_vAdjust->value = m_vAdjust->upper - m_vAdjust->page_size;
 414             if (m_vAdjust->value < 0.0)
 415                 m_vAdjust->value = 0.0;
 416
 417             if (GetChildren().GetCount() == 0)
 418                 m_yScrollPosition = (int)m_vAdjust->value;
 419             else
 420                 gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 421         }
 422     }
 423
 424     m_xScrollLinesPerPage = (int)(m_hAdjust->page_size + 0.5);
 425     m_yScrollLinesPerPage = (int)(m_vAdjust->page_size + 0.5);
 426
 427     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 428     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 429 }
 430
 431
 432 // ----------------------------------------------------------------------------
 433 // target window handling
 434 // ----------------------------------------------------------------------------
 435
 436 void wxScrolledWindow::SetTargetWindow( wxWindow *target, bool WXUNUSED(pushEventHandler) )
 437 {
 438     wxASSERT_MSG( target, wxT("target window must not be NULL") );
 439     m_targetWindow = target;
 440 }
 441
 442 wxWindow *wxScrolledWindow::GetTargetWindow()
 443 {
 444     return m_targetWindow;
 445 }
 446
 447 // Override this function if you don't want to have wxScrolledWindow
 448 // automatically change the origin according to the scroll position.
 449 void wxScrolledWindow::PrepareDC(wxDC& dc)
 450 {
 451     dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,
 452                         -m_yScrollPosition * m_yScrollPixelsPerLine );
 453 }
 454
 455 void wxScrolledWindow::SetScrollRate( int xstep, int ystep )
 456 {
 457     int old_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 458     int old_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 459
 460     m_xScrollPixelsPerLine = xstep;
 461     m_yScrollPixelsPerLine = ystep;
 462
 463     int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 464     int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 465
 466     m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
 467
 468     AdjustScrollbars();
 469 }
 470
 471 void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 472 {
 473     if ( x_unit )
 474         *x_unit = m_xScrollPixelsPerLine;
 475     if ( y_unit )
 476         *y_unit = m_yScrollPixelsPerLine;
 477 }
 478
 479 int wxScrolledWindow::GetScrollPageSize(int orient) const
 480 {
 481     if ( orient == wxHORIZONTAL )
 482         return m_xScrollLinesPerPage;
 483     else
 484         return m_yScrollLinesPerPage;
 485 }
 486
 487 void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
 488 {
 489     if ( orient == wxHORIZONTAL )
 490         m_xScrollLinesPerPage = pageSize;
 491     else
 492         m_yScrollLinesPerPage = pageSize;
 493 }
 494
 495 void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)
 496 {
 497     int orient = event.GetOrientation();
 498
 499     int nScrollInc = CalcScrollInc(event);
 500     if (nScrollInc == 0) return;
 501
 502     if (orient == wxHORIZONTAL)
 503     {
 504         int newPos = m_xScrollPosition + nScrollInc;
 505         SetScrollPos(wxHORIZONTAL, newPos, TRUE );
 506     }
 507     else
 508     {
 509         int newPos = m_yScrollPosition + nScrollInc;
 510         SetScrollPos(wxVERTICAL, newPos, TRUE );
 511     }
 512
 513     if (orient == wxHORIZONTAL)
 514     {
 515         m_xScrollPosition += nScrollInc;
 516     }
 517     else
 518     {
 519         m_yScrollPosition += nScrollInc;
 520     }
 521
 522     if (orient == wxHORIZONTAL)
 523     {
 524        if (m_xScrollingEnabled)
 525             m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
 526        else
 527             m_targetWindow->Refresh();
 528     }
 529     else
 530     {
 531         if (m_yScrollingEnabled)
 532             m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
 533         else
 534             m_targetWindow->Refresh();
 535     }
 536 }
 537
 538 void wxScrolledWindow::Scroll( int x_pos, int y_pos )
 539 {
 540     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 541
 542     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
 543         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
 544
 545     if ((x_pos != -1) && (m_xScrollPixelsPerLine))
 546     {
 547         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 548         if (max < 0) max = 0;
 549         if (x_pos > max) x_pos = max;
 550         if (x_pos < 0) x_pos = 0;
 551
 552         int old_x = m_xScrollPosition;
 553         m_xScrollPosition = x_pos;
 554         m_hAdjust->value = x_pos;
 555
 556         m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
 557
 558         // Just update the scrollbar, don't send any wxWindows event
 559         GtkHDisconnectEvent();
 560         gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 561         GtkHConnectEvent();
 562     }
 563
 564     if ((y_pos != -1) && (m_yScrollPixelsPerLine))
 565     {
 566         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 567         if (max < 0) max = 0;
 568         if (y_pos > max) y_pos = max;
 569         if (y_pos < 0) y_pos = 0;
 570
 571         int old_y = m_yScrollPosition;
 572         m_yScrollPosition = y_pos;
 573         m_vAdjust->value = y_pos;
 574
 575         m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
 576
 577         // Just update the scrollbar, don't send any wxWindows event
 578         GtkVDisconnectEvent();
 579         gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 580         GtkVConnectEvent();
 581     }
 582 }
 583
 584 // TODO: [VH]Scroll functions should be combined
 585
 586 void wxScrolledWindow::GtkVScroll( float value, unsigned int scroll_type )
 587 {
 588     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 589
 590     if (m_yScrollPixelsPerLine == 0)
 591         return;
 592
 593     int y_pos = (int)(value+0.5);
 594
 595     if (y_pos == m_yScrollPosition)
 596         return;
 597
 598     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 599
 600     wxScrollWinEvent event( command, y_pos, wxVERTICAL );
 601     event.SetEventObject( this );
 602     GetEventHandler()->ProcessEvent( event );
 603 }
 604
 605 void wxScrolledWindow::GtkHScroll( float value, unsigned int scroll_type )
 606 {
 607     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 608
 609     if (m_xScrollPixelsPerLine == 0)
 610         return;
 611
 612     int x_pos = (int)(value+0.5);
 613
 614     if (x_pos == m_xScrollPosition)
 615         return;
 616
 617     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 618
 619     wxScrollWinEvent event( command, x_pos, wxHORIZONTAL );
 620     event.SetEventObject( this );
 621     GetEventHandler()->ProcessEvent( event );
 622 }
 623
 624 void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
 625 {
 626     m_xScrollingEnabled = x_scroll;
 627     m_yScrollingEnabled = y_scroll;
 628 }
 629
 630 // Where the current view starts from
 631 void wxScrolledWindow::GetViewStart (int *x, int *y) const
 632 {
 633     if ( x )
 634         *x = m_xScrollPosition;
 635     if ( y )
 636         *y = m_yScrollPosition;
 637 }
 638
 639 void wxScrolledWindow::DoCalcScrolledPosition(int x, int y, int *xx, int *yy) const
 640 {
 641     if ( xx )
 642         *xx = x - m_xScrollPosition * m_xScrollPixelsPerLine;
 643     if ( yy )
 644         *yy = y - m_yScrollPosition * m_yScrollPixelsPerLine;
 645 }
 646
 647 void wxScrolledWindow::DoCalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
 648 {
 649     if ( xx )
 650         *xx = x + m_xScrollPosition * m_xScrollPixelsPerLine;
 651     if ( yy )
 652         *yy = y + m_yScrollPosition * m_yScrollPixelsPerLine;
 653 }
 654
 655 int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
 656 {
 657     int pos = event.GetPosition();
 658     int orient = event.GetOrientation();
 659
 660     int nScrollInc = 0;
 661     if (event.GetEventType() == wxEVT_SCROLLWIN_TOP)
 662     {
 663             if (orient == wxHORIZONTAL)
 664                 nScrollInc = - m_xScrollPosition;
 665             else
 666                 nScrollInc = - m_yScrollPosition;
 667     } else
 668     if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
 669     {
 670             if (orient == wxHORIZONTAL)
 671                 nScrollInc = GetVirtualSize().GetWidth() / m_xScrollPixelsPerLine - m_xScrollPosition;
 672             else
 673                 nScrollInc = GetVirtualSize().GetHeight() / m_yScrollPixelsPerLine - m_yScrollPosition;
 674     } else
 675     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
 676     {
 677             nScrollInc = -1;
 678     } else
 679     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN)
 680     {
 681             nScrollInc = 1;
 682     } else
 683     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEUP)
 684     {
 685             if (orient == wxHORIZONTAL)
 686                 nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
 687             else
 688                 nScrollInc = -GetScrollPageSize(wxVERTICAL);
 689     } else
 690     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEDOWN)
 691     {
 692             if (orient == wxHORIZONTAL)
 693                 nScrollInc = GetScrollPageSize(wxHORIZONTAL);
 694             else
 695                 nScrollInc = GetScrollPageSize(wxVERTICAL);
 696     } else
 697     if ((event.GetEventType() == wxEVT_SCROLLWIN_THUMBTRACK) ||
 698         (event.GetEventType() == wxEVT_SCROLLWIN_THUMBRELEASE))
 699     {
 700             if (orient == wxHORIZONTAL)
 701                 nScrollInc = pos - m_xScrollPosition;
 702             else
 703                 nScrollInc = pos - m_yScrollPosition;
 704     }
 705
 706     if (orient == wxHORIZONTAL)
 707     {
 708         if (m_xScrollPixelsPerLine > 0)
 709         {
 710             int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 711             if (max < 0) max = 0;
 712
 713             if ( (m_xScrollPosition + nScrollInc) < 0 )
 714                 nScrollInc = -m_xScrollPosition; // As -ve as we can go
 715             else if ( (m_xScrollPosition + nScrollInc) > max )
 716                 nScrollInc = max - m_xScrollPosition; // As +ve as we can go
 717         }
 718         else
 719             m_targetWindow->Refresh();
 720     }
 721     else
 722     {
 723         if (m_yScrollPixelsPerLine > 0)
 724         {
 725             int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 726             if (max < 0) max = 0;
 727
 728             if ( (m_yScrollPosition + nScrollInc) < 0 )
 729                 nScrollInc = -m_yScrollPosition; // As -ve as we can go
 730             else if ( (m_yScrollPosition + nScrollInc) > max )
 731                 nScrollInc = max - m_yScrollPosition; // As +ve as we can go
 732         }
 733         else
 734             m_targetWindow->Refresh();
 735     }
 736
 737     return nScrollInc;
 738 }
 739
 740 void wxScrolledWindow::SetScrollPos( int orient, int pos, bool refresh )
 741 {
 742     wxCHECK_RET( m_widget != NULL, wxT("invalid window") );
 743
 744     wxCHECK_RET( m_wxwindow != NULL, wxT("window needs client area for scrolling") );
 745
 746     if (orient == wxHORIZONTAL)
 747     {
 748         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 749         if (max < 0) max = 0;
 750
 751         if (pos > max) pos = 0;
 752         if (pos < 0) pos = 0;
 753
 754         if (pos == (int)(m_hAdjust->value+0.5)) return;
 755         m_hAdjust->value = pos;
 756     }
 757     else
 758     {
 759         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 760         if (max < 0) max = 0;
 761
 762         if (pos > max) pos = 0;
 763         if (pos < 0) pos = 0;
 764
 765         if (pos == (int)(m_vAdjust->value+0.5)) return;
 766         m_vAdjust->value = pos;
 767     }
 768
 769     if (m_wxwindow->window)
 770     {
 771         if (orient == wxHORIZONTAL)
 772         {
 773             // Just update the scrollbar, don't send any wxWindows event
 774             GtkHDisconnectEvent();
 775             gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 776             GtkHConnectEvent();
 777         }
 778         else
 779         {
 780             // Just update the scrollbar, don't send any wxWindows event
 781             GtkVDisconnectEvent();
 782             gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 783             GtkVConnectEvent();
 784         }
 785     }
 786 }
 787
 788 void wxScrolledWindow::GtkVConnectEvent()
 789 {
 790     gtk_signal_connect( GTK_OBJECT(m_vAdjust), "value_changed",
 791           (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 792 }
 793
 794 void wxScrolledWindow::GtkHConnectEvent()
 795 {
 796     gtk_signal_connect( GTK_OBJECT(m_hAdjust), "value_changed",
 797           (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 798 }
 799
 800 void wxScrolledWindow::GtkHDisconnectEvent()
 801 {
 802     gtk_signal_disconnect_by_func( GTK_OBJECT(m_hAdjust),
 803         (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 804 }
 805
 806 void wxScrolledWindow::GtkVDisconnectEvent()
 807 {
 808     gtk_signal_disconnect_by_func( GTK_OBJECT(m_vAdjust),
 809         (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 810 }
 811
 812 bool wxScrolledWindow::Layout()
 813 {
 814     if (GetSizer() && m_targetWindow == this)
 815     {
 816         // If we're the scroll target, take into account the
 817         // virtual size and scrolled position of the window.
 818
 819         int x, y, w, h;
 820         CalcScrolledPosition(0,0, &x,&y);
 821         GetVirtualSize(&w, &h);
 822         GetSizer()->SetDimension(x, y, w, h);
 823         return TRUE;
 824     }
 825     else
 826         return wxPanel::Layout();  // fall back to default for LayoutConstraints
 827 }
 828
 829 // ----------------------------------------------------------------------------
 830 // event handlers
 831 // ----------------------------------------------------------------------------
 832
 833 // Default OnSize resets scrollbars, if any
 834 void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 835 {
 836     if( GetAutoLayout() || m_targetWindow->GetAutoLayout() )
 837     {
 838         if( m_targetWindow != this )
 839             m_targetWindow->FitInside();
 840
 841         FitInside();
 842
 843         // FIXME:  Something is really weird here...  This should be
 844         // called by FitInside above (and apparently is), yet the
 845         // scrollsub sample will get the scrollbar wrong if resized
 846         // quickly.  This masks the bug, but is surely not the right
 847         // answer at all.
 848         AdjustScrollbars();
 849     }
 850     else
 851     {
 852         AdjustScrollbars();
 853     }
 854 }
 855
 856 // This calls OnDraw, having adjusted the origin according to the current
 857 // scroll position
 858 void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 859 {
 860     wxPaintDC dc(this);
 861     PrepareDC(dc);
 862
 863     OnDraw(dc);
 864 }
 865
 866 // kbd handling: notice that we use OnChar() and not OnKeyDown() for
 867 // compatibility here - if we used OnKeyDown(), the programs which process
 868 // arrows themselves in their OnChar() would never get the message and like
 869 // this they always have the priority
 870 void wxScrolledWindow::OnChar(wxKeyEvent& event)
 871 {
 872     int stx, sty,       // view origin
 873         szx, szy,       // view size (total)
 874         clix, cliy;     // view size (on screen)
 875
 876     GetViewStart(&stx, &sty);
 877     GetClientSize(&clix, &cliy);
 878     GetVirtualSize(&szx, &szy);
 879
 880     if( m_xScrollPixelsPerLine )
 881     {
 882         clix /= m_xScrollPixelsPerLine;
 883         szx /= m_xScrollPixelsPerLine;
 884     }
 885     else
 886     {
 887         clix = 0;
 888         szx = -1;
 889     }
 890     if( m_yScrollPixelsPerLine )
 891     {
 892         cliy /= m_yScrollPixelsPerLine;
 893         szy /= m_yScrollPixelsPerLine;
 894     }
 895     else
 896     {
 897         cliy = 0;
 898         szy = -1;
 899     }
 900
 901     int xScrollOld = GetScrollPos(wxHORIZONTAL),
 902         yScrollOld = GetScrollPos(wxVERTICAL);
 903
 904     int dsty;
 905     switch ( event.GetKeyCode() )
 906     {
 907         case WXK_PAGEUP:
 908         case WXK_PRIOR:
 909             dsty = sty - (5 * cliy / 6);
 910             Scroll(-1, (dsty == -1) ? 0 : dsty);
 911             break;
 912
 913         case WXK_PAGEDOWN:
 914         case WXK_NEXT:
 915             Scroll(-1, sty + (5 * cliy / 6));
 916             break;
 917
 918         case WXK_HOME:
 919             Scroll(0, event.ControlDown() ? 0 : -1);
 920             break;
 921
 922         case WXK_END:
 923             Scroll(szx - clix, event.ControlDown() ? szy - cliy : -1);
 924             break;
 925
 926         case WXK_UP:
 927             Scroll(-1, sty - 1);
 928             break;
 929
 930         case WXK_DOWN:
 931             Scroll(-1, sty + 1);
 932             break;
 933
 934         case WXK_LEFT:
 935             Scroll(stx - 1, -1);
 936             break;
 937
 938         case WXK_RIGHT:
 939             Scroll(stx + 1, -1);
 940             break;
 941
 942         default:
 943             // not for us
 944             event.Skip();
 945             return;
 946     }
 947
 948     int xScroll = GetScrollPos(wxHORIZONTAL);
 949     if ( xScroll != xScrollOld )
 950     {
 951         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, xScroll,
 952                                wxHORIZONTAL);
 953         event.SetEventObject(this);
 954         GetEventHandler()->ProcessEvent(event);
 955     }
 956
 957     int yScroll = GetScrollPos(wxVERTICAL);
 958     if ( yScroll != yScrollOld )
 959     {
 960         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, yScroll,
 961                                wxVERTICAL);
 962         event.SetEventObject(this);
 963         GetEventHandler()->ProcessEvent(event);
 964     }
 965 }
 966
 967
 968 // vi:sts=4:sw=4:et