src/gtk1/scrolwin.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        generic/scrolwin.cpp
   3 // Purpose:     wxScrolledWindow implementation
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21     #pragma implementation "scrolwin.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #include "wx/utils.h"
  32 #include "wx/dcclient.h"
  33
  34 #include "wx/gtk/scrolwin.h"
  35 #include "wx/panel.h"
  36
  37 #include <gtk/gtk.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
  63 //-----------------------------------------------------------------------------
  64 // idle system
  65 //-----------------------------------------------------------------------------
  66
  67 extern void wxapp_install_idle_handler();
  68 extern bool g_isIdle;
  69
  70 //-----------------------------------------------------------------------------
  71 // "value_changed" from m_vAdjust
  72 //-----------------------------------------------------------------------------
  73
  74 static void gtk_scrolled_window_vscroll_callback( GtkAdjustment *adjust, wxScrolledWindow *win )
  75 {
  76     if (g_isIdle)
  77         wxapp_install_idle_handler();
  78
  79     if (g_blockEventsOnDrag) return;
  80
  81     if (!win->m_hasVMT) return;
  82
  83     win->GtkVScroll( adjust->value );
  84 }
  85
  86 //-----------------------------------------------------------------------------
  87 // "value_changed" from m_hAdjust
  88 //-----------------------------------------------------------------------------
  89
  90 static void gtk_scrolled_window_hscroll_callback( GtkAdjustment *adjust, wxScrolledWindow *win )
  91 {
  92     if (g_isIdle)
  93         wxapp_install_idle_handler();
  94
  95     if (g_blockEventsOnDrag) return;
  96     if (!win->m_hasVMT) return;
  97
  98     win->GtkHScroll( adjust->value );
  99 }
 100
 101 //-----------------------------------------------------------------------------
 102 // InsertChild for wxScrolledWindow
 103 //-----------------------------------------------------------------------------
 104
 105 static void wxInsertChildInScrolledWindow( wxWindow* parent, wxWindow* child )
 106 {
 107     /* the window might have been scrolled already, do we
 108        have to adapt the position */
 109     GtkPizza *pizza = GTK_PIZZA(parent->m_wxwindow);
 110     child->m_x += pizza->xoffset;
 111     child->m_y += pizza->yoffset;
 112
 113     gtk_pizza_put( GTK_PIZZA(parent->m_wxwindow),
 114                      GTK_WIDGET(child->m_widget),
 115                      child->m_x,
 116                      child->m_y,
 117                      child->m_width,
 118                      child->m_height );
 119 }
 120
 121 // ----------------------------------------------------------------------------
 122 // wxScrolledWindow creation
 123 // ----------------------------------------------------------------------------
 124
 125 wxScrolledWindow::wxScrolledWindow()
 126 {
 127     m_xScrollPixelsPerLine = 0;
 128     m_yScrollPixelsPerLine = 0;
 129     m_xScrollingEnabled = TRUE;
 130     m_yScrollingEnabled = TRUE;
 131     m_xScrollPosition = 0;
 132     m_yScrollPosition = 0;
 133     m_xScrollLines = 0;
 134     m_yScrollLines = 0;
 135     m_xScrollLinesPerPage = 0;
 136     m_yScrollLinesPerPage = 0;
 137     m_targetWindow = (wxWindow*) NULL;
 138     m_scaleX = 1.0;
 139     m_scaleY = 1.0;
 140 }
 141
 142 bool wxScrolledWindow::Create(wxWindow *parent,
 143                               wxWindowID id,
 144                               const wxPoint& pos,
 145                               const wxSize& size,
 146                               long style,
 147                               const wxString& name)
 148 {
 149     if (!PreCreation( parent, pos, size ) ||
 150         !CreateBase( parent, id, pos, size, style, wxDefaultValidator, name ))
 151     {
 152         wxFAIL_MSG( wxT("wxWindow creation failed") );
 153         return FALSE;
 154     }
 155
 156     m_insertCallback = wxInsertChildInScrolledWindow;
 157
 158     m_xScrollPixelsPerLine = 0;
 159     m_yScrollPixelsPerLine = 0;
 160     m_xScrollingEnabled = TRUE;
 161     m_yScrollingEnabled = TRUE;
 162     m_xScrollPosition = 0;
 163     m_yScrollPosition = 0;
 164     m_xScrollLines = 0;
 165     m_yScrollLines = 0;
 166     m_xScrollLinesPerPage = 0;
 167     m_yScrollLinesPerPage = 0;
 168
 169     m_targetWindow = this;
 170
 171     m_widget = gtk_scrolled_window_new( (GtkAdjustment *) NULL, (GtkAdjustment *) NULL );
 172     GTK_WIDGET_UNSET_FLAGS( m_widget, GTK_CAN_FOCUS );
 173
 174     GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(m_widget);
 175
 176     GtkScrolledWindowClass *scroll_class = GTK_SCROLLED_WINDOW_CLASS( GTK_OBJECT_GET_CLASS(m_widget) );
 177     scroll_class->scrollbar_spacing = 0;
 178
 179     gtk_scrolled_window_set_policy( scrolledWindow, GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC );
 180
 181     m_hAdjust = gtk_range_get_adjustment( GTK_RANGE(scrolledWindow->hscrollbar) );
 182     m_vAdjust = gtk_range_get_adjustment( GTK_RANGE(scrolledWindow->vscrollbar) );
 183
 184     m_wxwindow = gtk_pizza_new();
 185
 186     gtk_container_add( GTK_CONTAINER(m_widget), m_wxwindow );
 187
 188     GtkPizza *pizza = GTK_PIZZA(m_wxwindow);
 189
 190     if (HasFlag(wxRAISED_BORDER))
 191     {
 192         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_OUT );
 193     }
 194     else if (HasFlag(wxSUNKEN_BORDER))
 195     {
 196         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_IN );
 197     }
 198     else if (HasFlag(wxSIMPLE_BORDER))
 199     {
 200         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_THIN );
 201     }
 202     else
 203     {
 204         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_NONE );
 205     }
 206
 207     GTK_WIDGET_SET_FLAGS( m_wxwindow, GTK_CAN_FOCUS );
 208     m_acceptsFocus = TRUE;
 209
 210     // I _really_ don't want scrollbars in the beginning
 211     m_vAdjust->lower = 0.0;
 212     m_vAdjust->upper = 1.0;
 213     m_vAdjust->value = 0.0;
 214     m_vAdjust->step_increment = 1.0;
 215     m_vAdjust->page_increment = 1.0;
 216     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 217     m_hAdjust->lower = 0.0;
 218     m_hAdjust->upper = 1.0;
 219     m_hAdjust->value = 0.0;
 220     m_hAdjust->step_increment = 1.0;
 221     m_hAdjust->page_increment = 1.0;
 222     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 223
 224     // these handlers get notified when screen updates are required either when
 225     // scrolling or when the window size (and therefore scrollbar configuration)
 226     // has changed
 227     gtk_signal_connect( GTK_OBJECT(m_hAdjust), "value_changed",
 228           (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 229     gtk_signal_connect( GTK_OBJECT(m_vAdjust), "value_changed",
 230           (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 231
 232     gtk_widget_show( m_wxwindow );
 233
 234     if (m_parent)
 235         m_parent->DoAddChild( this );
 236
 237     PostCreation();
 238
 239     Show( TRUE );
 240
 241     return TRUE;
 242 }
 243
 244 wxScrolledWindow::~wxScrolledWindow()
 245 {
 246 }
 247
 248 // ----------------------------------------------------------------------------
 249 // setting scrolling parameters
 250 // ----------------------------------------------------------------------------
 251
 252 /*
 253  * pixelsPerUnitX/pixelsPerUnitY: number of pixels per unit (e.g. pixels per text line)
 254  * noUnitsX/noUnitsY:        : no. units per scrollbar
 255  */
 256 void wxScrolledWindow::SetScrollbars (int pixelsPerUnitX, int pixelsPerUnitY,
 257                int noUnitsX, int noUnitsY,
 258                int xPos, int yPos, bool noRefresh )
 259 {
 260     m_xScrollPixelsPerLine = pixelsPerUnitX;
 261     m_yScrollPixelsPerLine = pixelsPerUnitY;
 262     m_xScrollPosition = xPos;
 263     m_yScrollPosition = yPos;
 264     m_xScrollLines = noUnitsX;
 265     m_yScrollLines = noUnitsY;
 266
 267     m_hAdjust->lower = 0.0;
 268     m_hAdjust->upper = noUnitsX;
 269     m_hAdjust->value = xPos;
 270     m_hAdjust->step_increment = 1.0;
 271     m_hAdjust->page_increment = 2.0;
 272
 273     m_vAdjust->lower = 0.0;
 274     m_vAdjust->upper = noUnitsY;
 275     m_vAdjust->value = yPos;
 276     m_vAdjust->step_increment = 1.0;
 277     m_vAdjust->page_increment = 2.0;
 278
 279     AdjustScrollbars();
 280 }
 281
 282 void wxScrolledWindow::AdjustScrollbars()
 283 {
 284     int w, h;
 285     m_targetWindow->GetClientSize( &w, &h );
 286
 287     if (m_xScrollPixelsPerLine == 0)
 288         m_hAdjust->page_size = 1.0;
 289     else
 290         m_hAdjust->page_size = (w / m_xScrollPixelsPerLine);
 291
 292     if (m_yScrollPixelsPerLine == 0)
 293         m_vAdjust->page_size = 1.0;
 294     else
 295         m_vAdjust->page_size = (h / m_yScrollPixelsPerLine);
 296
 297     m_xScrollLinesPerPage = (int)(m_hAdjust->page_size + 0.5);
 298     m_yScrollLinesPerPage = (int)(m_vAdjust->page_size + 0.5);
 299
 300     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 301     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 302 }
 303
 304 // ----------------------------------------------------------------------------
 305 // target window handling
 306 // ----------------------------------------------------------------------------
 307
 308 void wxScrolledWindow::SetTargetWindow( wxWindow *target )
 309 {
 310     wxASSERT_MSG( target, wxT("target window must not be NULL") );
 311     m_targetWindow = target;
 312 }
 313
 314 wxWindow *wxScrolledWindow::GetTargetWindow()
 315 {
 316     return m_targetWindow;
 317 }
 318
 319 // Override this function if you don't want to have wxScrolledWindow
 320 // automatically change the origin according to the scroll position.
 321 void wxScrolledWindow::PrepareDC(wxDC& dc)
 322 {
 323     dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,
 324                         -m_yScrollPosition * m_yScrollPixelsPerLine );
 325 }
 326
 327 void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 328 {
 329     if ( x_unit )
 330         *x_unit = m_xScrollPixelsPerLine;
 331     if ( y_unit )
 332         *y_unit = m_yScrollPixelsPerLine;
 333 }
 334
 335 int wxScrolledWindow::GetScrollPageSize(int orient) const
 336 {
 337     if ( orient == wxHORIZONTAL )
 338         return m_xScrollLinesPerPage;
 339     else
 340         return m_yScrollLinesPerPage;
 341 }
 342
 343 void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
 344 {
 345     if ( orient == wxHORIZONTAL )
 346         m_xScrollLinesPerPage = pageSize;
 347     else
 348         m_yScrollLinesPerPage = pageSize;
 349 }
 350
 351 void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)
 352 {
 353     int orient = event.GetOrientation();
 354
 355     int nScrollInc = CalcScrollInc(event);
 356     if (nScrollInc == 0) return;
 357
 358     if (orient == wxHORIZONTAL)
 359     {
 360         int newPos = m_xScrollPosition + nScrollInc;
 361         SetScrollPos(wxHORIZONTAL, newPos, TRUE );
 362     }
 363     else
 364     {
 365         int newPos = m_yScrollPosition + nScrollInc;
 366         SetScrollPos(wxVERTICAL, newPos, TRUE );
 367     }
 368
 369     if (orient == wxHORIZONTAL)
 370     {
 371         m_xScrollPosition += nScrollInc;
 372     }
 373     else
 374     {
 375         m_yScrollPosition += nScrollInc;
 376     }
 377
 378     if (orient == wxHORIZONTAL)
 379     {
 380        if (m_xScrollingEnabled)
 381             m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
 382        else
 383             m_targetWindow->Refresh();
 384     }
 385     else
 386     {
 387         if (m_yScrollingEnabled)
 388             m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
 389         else
 390             m_targetWindow->Refresh();
 391     }
 392 }
 393
 394 void wxScrolledWindow::Scroll( int x_pos, int y_pos )
 395 {
 396     if (!m_targetWindow)
 397         return;
 398
 399     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
 400         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
 401
 402     if ((x_pos != -1) && (m_xScrollPixelsPerLine))
 403     {
 404         int old_x = m_xScrollPosition;
 405         m_xScrollPosition = x_pos;
 406         m_hAdjust->value = x_pos;
 407
 408         wxEventType command = wxEVT_SCROLLWIN_THUMBTRACK;
 409         wxScrollWinEvent event( command, m_xScrollPosition, wxHORIZONTAL );
 410         event.SetEventObject( this );
 411         GetEventHandler()->ProcessEvent( event );
 412
 413         m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
 414
 415         gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 416     }
 417
 418     if ((y_pos != -1) && (m_yScrollPixelsPerLine))
 419     {
 420         int old_y = m_yScrollPosition;
 421         m_yScrollPosition = y_pos;
 422         m_vAdjust->value = y_pos;
 423
 424         wxEventType command = wxEVT_SCROLLWIN_THUMBTRACK;
 425         wxScrollWinEvent event( command, m_yScrollPosition, wxVERTICAL );
 426         event.SetEventObject( this );
 427         GetEventHandler()->ProcessEvent( event );
 428
 429         m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
 430
 431         gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 432     }
 433 }
 434
 435 void wxScrolledWindow::GtkVScroll( float value )
 436 {
 437     if (!m_targetWindow)
 438         return;
 439
 440     if (m_yScrollPixelsPerLine == 0)
 441         return;
 442
 443     int y_pos = (int)(value+0.5);
 444
 445     if (y_pos == m_yScrollPosition)
 446         return;
 447
 448     GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(m_widget);
 449     GtkRange *range = GTK_RANGE(scrolledWindow->vscrollbar);
 450
 451     wxEventType command = wxEVT_SCROLLWIN_THUMBTRACK;
 452     if      (range->scroll_type == GTK_SCROLL_STEP_BACKWARD) command = wxEVT_SCROLLWIN_LINEUP;
 453     else if (range->scroll_type == GTK_SCROLL_STEP_FORWARD)  command = wxEVT_SCROLLWIN_LINEDOWN;
 454     else if (range->scroll_type == GTK_SCROLL_PAGE_BACKWARD) command = wxEVT_SCROLLWIN_PAGEUP;
 455     else if (range->scroll_type == GTK_SCROLL_PAGE_FORWARD)  command = wxEVT_SCROLLWIN_PAGEDOWN;
 456
 457     wxScrollWinEvent event( command, y_pos, wxVERTICAL );
 458     event.SetEventObject( this );
 459     GetEventHandler()->ProcessEvent( event );
 460
 461 /*
 462     int old_y = m_yScrollPosition;
 463     m_yScrollPosition = y_pos;
 464
 465     m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
 466 */
 467 }
 468
 469 void wxScrolledWindow::GtkHScroll( float value )
 470 {
 471     if (!m_targetWindow)
 472         return;
 473
 474     if (m_xScrollPixelsPerLine == 0)
 475         return;
 476
 477     int x_pos = (int)(value+0.5);
 478
 479     if (x_pos == m_xScrollPosition)
 480         return;
 481
 482     GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(m_widget);
 483     GtkRange *range = GTK_RANGE(scrolledWindow->hscrollbar);
 484
 485     wxEventType command = wxEVT_SCROLLWIN_THUMBTRACK;
 486     if      (range->scroll_type == GTK_SCROLL_STEP_BACKWARD) command = wxEVT_SCROLLWIN_LINEUP;
 487     else if (range->scroll_type == GTK_SCROLL_STEP_FORWARD)  command = wxEVT_SCROLLWIN_LINEDOWN;
 488     else if (range->scroll_type == GTK_SCROLL_PAGE_BACKWARD) command = wxEVT_SCROLLWIN_PAGEUP;
 489     else if (range->scroll_type == GTK_SCROLL_PAGE_FORWARD)  command = wxEVT_SCROLLWIN_PAGEDOWN;
 490
 491     wxScrollWinEvent event( command, x_pos, wxHORIZONTAL );
 492     event.SetEventObject( this );
 493     GetEventHandler()->ProcessEvent( event );
 494
 495 /*
 496     int old_x = m_xScrollPosition;
 497     m_xScrollPosition = x_pos;
 498
 499     m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
 500 */
 501 }
 502
 503 void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
 504 {
 505     m_xScrollingEnabled = x_scroll;
 506     m_yScrollingEnabled = y_scroll;
 507 }
 508
 509 void wxScrolledWindow::GetVirtualSize (int *x, int *y) const
 510 {
 511     if ( x )
 512         *x = m_xScrollPixelsPerLine * m_xScrollLines;
 513     if ( y )
 514         *y = m_yScrollPixelsPerLine * m_yScrollLines;
 515 }
 516
 517 // Where the current view starts from
 518 void wxScrolledWindow::GetViewStart (int *x, int *y) const
 519 {
 520     if ( x )
 521         *x = m_xScrollPosition;
 522     if ( y )
 523         *y = m_yScrollPosition;
 524 }
 525
 526 void wxScrolledWindow::CalcScrolledPosition(int x, int y, int *xx, int *yy) const
 527 {
 528     if ( xx )
 529         *xx = x - m_xScrollPosition * m_xScrollPixelsPerLine;
 530     if ( yy )
 531         *yy = y - m_yScrollPosition * m_yScrollPixelsPerLine;
 532 }
 533
 534 void wxScrolledWindow::CalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
 535 {
 536     if ( xx )
 537         *xx = x + m_xScrollPosition * m_xScrollPixelsPerLine;
 538     if ( yy )
 539         *yy = y + m_yScrollPosition * m_yScrollPixelsPerLine;
 540 }
 541
 542 int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
 543 {
 544     int pos = event.GetPosition();
 545     int orient = event.GetOrientation();
 546
 547     int nScrollInc = 0;
 548     if (event.GetEventType() == wxEVT_SCROLLWIN_TOP)
 549     {
 550             if (orient == wxHORIZONTAL)
 551                 nScrollInc = - m_xScrollPosition;
 552             else
 553                 nScrollInc = - m_yScrollPosition;
 554     } else
 555     if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
 556     {
 557             if (orient == wxHORIZONTAL)
 558                 nScrollInc = m_xScrollLines - m_xScrollPosition;
 559             else
 560                 nScrollInc = m_yScrollLines - m_yScrollPosition;
 561     } else
 562     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
 563     {
 564             nScrollInc = -1;
 565     } else
 566     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN)
 567     {
 568             nScrollInc = 1;
 569     } else
 570     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEUP)
 571     {
 572             if (orient == wxHORIZONTAL)
 573                 nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
 574             else
 575                 nScrollInc = -GetScrollPageSize(wxVERTICAL);
 576     } else
 577     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEDOWN)
 578     {
 579             if (orient == wxHORIZONTAL)
 580                 nScrollInc = GetScrollPageSize(wxHORIZONTAL);
 581             else
 582                 nScrollInc = GetScrollPageSize(wxVERTICAL);
 583     } else
 584     if ((event.GetEventType() == wxEVT_SCROLLWIN_THUMBTRACK) ||
 585         (event.GetEventType() == wxEVT_SCROLLWIN_THUMBRELEASE))
 586     {
 587             if (orient == wxHORIZONTAL)
 588                 nScrollInc = pos - m_xScrollPosition;
 589             else
 590                 nScrollInc = pos - m_yScrollPosition;
 591     }
 592
 593     if (orient == wxHORIZONTAL)
 594     {
 595         if (m_xScrollPixelsPerLine > 0)
 596         {
 597             int w, h;
 598             m_targetWindow->GetClientSize(&w, &h);
 599
 600             int noPositions = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 601             if (noPositions < 0) noPositions = 0;
 602
 603             if ( (m_xScrollPosition + nScrollInc) < 0 )
 604                 nScrollInc = -m_xScrollPosition; // As -ve as we can go
 605             else if ( (m_xScrollPosition + nScrollInc) > noPositions )
 606                 nScrollInc = noPositions - m_xScrollPosition; // As +ve as we can go
 607         }
 608         else
 609             m_targetWindow->Refresh();
 610     }
 611     else
 612     {
 613         if (m_yScrollPixelsPerLine > 0)
 614         {
 615             int w, h;
 616             m_targetWindow->GetClientSize(&w, &h);
 617
 618             int noPositions = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 619             if (noPositions < 0) noPositions = 0;
 620
 621             if ( (m_yScrollPosition + nScrollInc) < 0 )
 622                 nScrollInc = -m_yScrollPosition; // As -ve as we can go
 623             else if ( (m_yScrollPosition + nScrollInc) > noPositions )
 624                 nScrollInc = noPositions - m_yScrollPosition; // As +ve as we can go
 625         }
 626         else
 627             m_targetWindow->Refresh();
 628     }
 629
 630     return nScrollInc;
 631 }
 632
 633 void wxScrolledWindow::SetScrollPos( int orient, int pos, bool WXUNUSED(refresh) )
 634 {
 635     wxCHECK_RET( m_widget != NULL, wxT("invalid window") );
 636
 637     wxCHECK_RET( m_wxwindow != NULL, wxT("window needs client area for scrolling") );
 638
 639     if (orient == wxHORIZONTAL)
 640     {
 641         float fpos = (float)pos;
 642         if (fpos > m_hAdjust->upper - m_hAdjust->page_size) fpos = m_hAdjust->upper - m_hAdjust->page_size;
 643         if (fpos < 0.0) fpos = 0.0;
 644
 645         if (fabs(fpos-m_hAdjust->value) < 0.2) return;
 646         m_hAdjust->value = fpos;
 647     }
 648     else
 649     {
 650         float fpos = (float)pos;
 651         if (fpos > m_vAdjust->upper - m_vAdjust->page_size) fpos = m_vAdjust->upper - m_vAdjust->page_size;
 652         if (fpos < 0.0) fpos = 0.0;
 653
 654         if (fabs(fpos-m_vAdjust->value) < 0.2) return;
 655         m_vAdjust->value = fpos;
 656     }
 657
 658     if (m_wxwindow->window)
 659     {
 660         if (orient == wxHORIZONTAL)
 661         {
 662             gtk_signal_disconnect_by_func( GTK_OBJECT(m_hAdjust),
 663                 (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 664
 665             gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 666
 667             gtk_signal_connect( GTK_OBJECT(m_hAdjust), "value_changed",
 668                 (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 669         }
 670         else
 671         {
 672             gtk_signal_disconnect_by_func( GTK_OBJECT(m_vAdjust),
 673                 (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 674
 675             gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 676
 677             gtk_signal_connect( GTK_OBJECT(m_vAdjust), "value_changed",
 678                 (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 679         }
 680     }
 681 }
 682
 683 // ----------------------------------------------------------------------------
 684 // event handlers
 685 // ----------------------------------------------------------------------------
 686
 687 // Default OnSize resets scrollbars, if any
 688 void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 689 {
 690 #if wxUSE_CONSTRAINTS
 691     if (GetAutoLayout())
 692         Layout();
 693 #endif
 694
 695     AdjustScrollbars();
 696 }
 697
 698 // This calls OnDraw, having adjusted the origin according to the current
 699 // scroll position
 700 void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 701 {
 702     wxPaintDC dc(this);
 703     PrepareDC(dc);
 704
 705     OnDraw(dc);
 706 }
 707
 708 // kbd handling: notice that we use OnChar() and not OnKeyDown() for
 709 // compatibility here - if we used OnKeyDown(), the programs which process
 710 // arrows themselves in their OnChar() would never get the message and like
 711 // this they always have the priority
 712 void wxScrolledWindow::OnChar(wxKeyEvent& event)
 713 {
 714     int stx, sty,       // view origin
 715         szx, szy,       // view size (total)
 716         clix, cliy;     // view size (on screen)
 717
 718     ViewStart(&stx, &sty);
 719     GetClientSize(&clix, &cliy);
 720     GetVirtualSize(&szx, &szy);
 721
 722     if( m_xScrollPixelsPerLine )
 723     {
 724         clix /= m_xScrollPixelsPerLine;
 725         szx /= m_xScrollPixelsPerLine;
 726     }
 727     else
 728     {
 729         clix = 0;
 730         szx = -1;
 731     }
 732     if( m_yScrollPixelsPerLine )
 733     {
 734         cliy /= m_yScrollPixelsPerLine;
 735         szy /= m_yScrollPixelsPerLine;
 736     }
 737     else
 738     {
 739         cliy = 0;
 740         szy = -1;
 741     }
 742
 743     int dsty;
 744     switch ( event.KeyCode() )
 745     {
 746         case WXK_PAGEUP:
 747         case WXK_PRIOR:
 748             dsty = sty - (5 * cliy / 6);
 749             Scroll(-1, (dsty == -1) ? 0 : dsty);
 750             break;
 751
 752         case WXK_PAGEDOWN:
 753         case WXK_NEXT:
 754             Scroll(-1, sty + (5 * cliy / 6));
 755             break;
 756
 757         case WXK_HOME:
 758             Scroll(0, event.ControlDown() ? 0 : -1);
 759             break;
 760
 761         case WXK_END:
 762             Scroll(szx - clix, event.ControlDown() ? szy - cliy : -1);
 763             break;
 764
 765         case WXK_UP:
 766             Scroll(-1, sty - 1);
 767             break;
 768
 769         case WXK_DOWN:
 770             Scroll(-1, sty + 1);
 771             break;
 772
 773         case WXK_LEFT:
 774             Scroll(stx - 1, -1);
 775             break;
 776
 777         case WXK_RIGHT:
 778             Scroll(stx + 1, -1);
 779             break;
 780
 781         default:
 782             // not for us
 783             event.Skip();
 784     }
 785 }