src/gtk/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     m_targetWindow->SetVirtualSizeHints( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY );
 353
 354     if (!noRefresh)
 355     {
 356         int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 357         int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 358
 359         m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
 360     }
 361 }
 362
 363 void wxScrolledWindow::AdjustScrollbars()
 364 {
 365     int w, h;
 366     int vw, vh;
 367
 368     m_targetWindow->GetClientSize( &w, &h );
 369     m_targetWindow->GetVirtualSize( &vw, &vh );
 370
 371     if (m_xScrollPixelsPerLine == 0)
 372     {
 373         m_hAdjust->upper = 1.0;
 374         m_hAdjust->page_size = 1.0;
 375     }
 376     else
 377     {
 378         m_hAdjust->upper = vw / m_xScrollPixelsPerLine;
 379         m_hAdjust->page_size = (w / m_xScrollPixelsPerLine);
 380
 381         // If the scrollbar hits the right side, move the window
 382         // right to keep it from over extending.
 383
 384         if( m_hAdjust->value + m_hAdjust->page_size > m_hAdjust->upper )
 385         {
 386             if (GetChildren().GetCount() == 0)
 387             {
 388                 m_hAdjust->value = m_hAdjust->upper - m_hAdjust->page_size;
 389                 m_xScrollPosition = (int)m_hAdjust->value;
 390             }
 391         }
 392     }
 393
 394     if (m_yScrollPixelsPerLine == 0)
 395     {
 396         m_vAdjust->upper = 1.0;
 397         m_vAdjust->page_size = 1.0;
 398     }
 399     else
 400     {
 401         m_vAdjust->upper = vh / m_yScrollPixelsPerLine;
 402         m_vAdjust->page_size = (h / m_yScrollPixelsPerLine);
 403
 404         if( m_vAdjust->value + m_vAdjust->page_size > m_vAdjust->upper )
 405         {
 406             if (GetChildren().GetCount() == 0)
 407             {
 408                 m_vAdjust->value = m_vAdjust->upper - m_vAdjust->page_size;
 409                 m_yScrollPosition = (int)m_vAdjust->value;
 410             }
 411         }
 412     }
 413
 414     m_xScrollLinesPerPage = (int)(m_hAdjust->page_size + 0.5);
 415     m_yScrollLinesPerPage = (int)(m_vAdjust->page_size + 0.5);
 416
 417     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 418     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 419 }
 420
 421
 422 // ----------------------------------------------------------------------------
 423 // target window handling
 424 // ----------------------------------------------------------------------------
 425
 426 void wxScrolledWindow::SetTargetWindow( wxWindow *target, bool WXUNUSED(pushEventHandler) )
 427 {
 428     wxASSERT_MSG( target, wxT("target window must not be NULL") );
 429     m_targetWindow = target;
 430 }
 431
 432 wxWindow *wxScrolledWindow::GetTargetWindow()
 433 {
 434     return m_targetWindow;
 435 }
 436
 437 // Override this function if you don't want to have wxScrolledWindow
 438 // automatically change the origin according to the scroll position.
 439 void wxScrolledWindow::PrepareDC(wxDC& dc)
 440 {
 441     dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,
 442                         -m_yScrollPosition * m_yScrollPixelsPerLine );
 443 }
 444
 445 void wxScrolledWindow::SetScrollRate( int xstep, int ystep )
 446 {
 447     int old_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 448     int old_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 449
 450     m_xScrollPixelsPerLine = xstep;
 451     m_yScrollPixelsPerLine = ystep;
 452
 453     int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 454     int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 455
 456     m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
 457
 458     AdjustScrollbars();
 459 }
 460
 461 void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 462 {
 463     if ( x_unit )
 464         *x_unit = m_xScrollPixelsPerLine;
 465     if ( y_unit )
 466         *y_unit = m_yScrollPixelsPerLine;
 467 }
 468
 469 int wxScrolledWindow::GetScrollPageSize(int orient) const
 470 {
 471     if ( orient == wxHORIZONTAL )
 472         return m_xScrollLinesPerPage;
 473     else
 474         return m_yScrollLinesPerPage;
 475 }
 476
 477 void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
 478 {
 479     if ( orient == wxHORIZONTAL )
 480         m_xScrollLinesPerPage = pageSize;
 481     else
 482         m_yScrollLinesPerPage = pageSize;
 483 }
 484
 485 void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)
 486 {
 487     int orient = event.GetOrientation();
 488
 489     int nScrollInc = CalcScrollInc(event);
 490     if (nScrollInc == 0) return;
 491
 492     if (orient == wxHORIZONTAL)
 493     {
 494         int newPos = m_xScrollPosition + nScrollInc;
 495         SetScrollPos(wxHORIZONTAL, newPos, TRUE );
 496     }
 497     else
 498     {
 499         int newPos = m_yScrollPosition + nScrollInc;
 500         SetScrollPos(wxVERTICAL, newPos, TRUE );
 501     }
 502
 503     if (orient == wxHORIZONTAL)
 504     {
 505         m_xScrollPosition += nScrollInc;
 506     }
 507     else
 508     {
 509         m_yScrollPosition += nScrollInc;
 510     }
 511
 512     if (orient == wxHORIZONTAL)
 513     {
 514        if (m_xScrollingEnabled)
 515             m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
 516        else
 517             m_targetWindow->Refresh();
 518     }
 519     else
 520     {
 521         if (m_yScrollingEnabled)
 522             m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
 523         else
 524             m_targetWindow->Refresh();
 525     }
 526 }
 527
 528 void wxScrolledWindow::Scroll( int x_pos, int y_pos )
 529 {
 530     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 531
 532     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
 533         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
 534
 535     if ((x_pos != -1) && (m_xScrollPixelsPerLine))
 536     {
 537         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 538         if (max < 0) max = 0;
 539         if (x_pos > max) x_pos = max;
 540         if (x_pos < 0) x_pos = 0;
 541
 542         int old_x = m_xScrollPosition;
 543         m_xScrollPosition = x_pos;
 544         m_hAdjust->value = x_pos;
 545
 546         m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
 547
 548         // Just update the scrollbar, don't send any wxWindows event
 549         GtkHDisconnectEvent();
 550         gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 551         GtkHConnectEvent();
 552     }
 553
 554     if ((y_pos != -1) && (m_yScrollPixelsPerLine))
 555     {
 556         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 557         if (max < 0) max = 0;
 558         if (y_pos > max) y_pos = max;
 559         if (y_pos < 0) y_pos = 0;
 560
 561         int old_y = m_yScrollPosition;
 562         m_yScrollPosition = y_pos;
 563         m_vAdjust->value = y_pos;
 564
 565         m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
 566
 567         // Just update the scrollbar, don't send any wxWindows event
 568         GtkVDisconnectEvent();
 569         gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 570         GtkVConnectEvent();
 571     }
 572 }
 573
 574 // TODO: [VH]Scroll functions should be combined
 575
 576 void wxScrolledWindow::GtkVScroll( float value, unsigned int scroll_type )
 577 {
 578     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 579
 580     if (m_yScrollPixelsPerLine == 0)
 581         return;
 582
 583     int y_pos = (int)(value+0.5);
 584
 585     if (y_pos == m_yScrollPosition)
 586         return;
 587
 588     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 589
 590     wxScrollWinEvent event( command, y_pos, wxVERTICAL );
 591     event.SetEventObject( this );
 592     GetEventHandler()->ProcessEvent( event );
 593 }
 594
 595 void wxScrolledWindow::GtkHScroll( float value, unsigned int scroll_type )
 596 {
 597     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 598
 599     if (m_xScrollPixelsPerLine == 0)
 600         return;
 601
 602     int x_pos = (int)(value+0.5);
 603
 604     if (x_pos == m_xScrollPosition)
 605         return;
 606
 607     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 608
 609     wxScrollWinEvent event( command, x_pos, wxHORIZONTAL );
 610     event.SetEventObject( this );
 611     GetEventHandler()->ProcessEvent( event );
 612 }
 613
 614 void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
 615 {
 616     m_xScrollingEnabled = x_scroll;
 617     m_yScrollingEnabled = y_scroll;
 618 }
 619
 620 // Where the current view starts from
 621 void wxScrolledWindow::GetViewStart (int *x, int *y) const
 622 {
 623     if ( x )
 624         *x = m_xScrollPosition;
 625     if ( y )
 626         *y = m_yScrollPosition;
 627 }
 628
 629 void wxScrolledWindow::DoCalcScrolledPosition(int x, int y, int *xx, int *yy) const
 630 {
 631     if ( xx )
 632         *xx = x - m_xScrollPosition * m_xScrollPixelsPerLine;
 633     if ( yy )
 634         *yy = y - m_yScrollPosition * m_yScrollPixelsPerLine;
 635 }
 636
 637 void wxScrolledWindow::DoCalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
 638 {
 639     if ( xx )
 640         *xx = x + m_xScrollPosition * m_xScrollPixelsPerLine;
 641     if ( yy )
 642         *yy = y + m_yScrollPosition * m_yScrollPixelsPerLine;
 643 }
 644
 645 int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
 646 {
 647     int pos = event.GetPosition();
 648     int orient = event.GetOrientation();
 649
 650     int nScrollInc = 0;
 651     if (event.GetEventType() == wxEVT_SCROLLWIN_TOP)
 652     {
 653             if (orient == wxHORIZONTAL)
 654                 nScrollInc = - m_xScrollPosition;
 655             else
 656                 nScrollInc = - m_yScrollPosition;
 657     } else
 658     if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
 659     {
 660             if (orient == wxHORIZONTAL)
 661                 nScrollInc = GetVirtualSize().GetWidth() / m_xScrollPixelsPerLine - m_xScrollPosition;
 662             else
 663                 nScrollInc = GetVirtualSize().GetHeight() / m_yScrollPixelsPerLine - m_yScrollPosition;
 664     } else
 665     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
 666     {
 667             nScrollInc = -1;
 668     } else
 669     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN)
 670     {
 671             nScrollInc = 1;
 672     } else
 673     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEUP)
 674     {
 675             if (orient == wxHORIZONTAL)
 676                 nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
 677             else
 678                 nScrollInc = -GetScrollPageSize(wxVERTICAL);
 679     } else
 680     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEDOWN)
 681     {
 682             if (orient == wxHORIZONTAL)
 683                 nScrollInc = GetScrollPageSize(wxHORIZONTAL);
 684             else
 685                 nScrollInc = GetScrollPageSize(wxVERTICAL);
 686     } else
 687     if ((event.GetEventType() == wxEVT_SCROLLWIN_THUMBTRACK) ||
 688         (event.GetEventType() == wxEVT_SCROLLWIN_THUMBRELEASE))
 689     {
 690             if (orient == wxHORIZONTAL)
 691                 nScrollInc = pos - m_xScrollPosition;
 692             else
 693                 nScrollInc = pos - m_yScrollPosition;
 694     }
 695
 696     if (orient == wxHORIZONTAL)
 697     {
 698         if (m_xScrollPixelsPerLine > 0)
 699         {
 700             int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 701             if (max < 0) max = 0;
 702
 703             if ( (m_xScrollPosition + nScrollInc) < 0 )
 704                 nScrollInc = -m_xScrollPosition; // As -ve as we can go
 705             else if ( (m_xScrollPosition + nScrollInc) > max )
 706                 nScrollInc = max - m_xScrollPosition; // As +ve as we can go
 707         }
 708         else
 709             m_targetWindow->Refresh();
 710     }
 711     else
 712     {
 713         if (m_yScrollPixelsPerLine > 0)
 714         {
 715             int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 716             if (max < 0) max = 0;
 717
 718             if ( (m_yScrollPosition + nScrollInc) < 0 )
 719                 nScrollInc = -m_yScrollPosition; // As -ve as we can go
 720             else if ( (m_yScrollPosition + nScrollInc) > max )
 721                 nScrollInc = max - m_yScrollPosition; // As +ve as we can go
 722         }
 723         else
 724             m_targetWindow->Refresh();
 725     }
 726
 727     return nScrollInc;
 728 }
 729
 730 void wxScrolledWindow::SetScrollPos( int orient, int pos, bool refresh )
 731 {
 732     wxCHECK_RET( m_widget != NULL, wxT("invalid window") );
 733
 734     wxCHECK_RET( m_wxwindow != NULL, wxT("window needs client area for scrolling") );
 735
 736     if (orient == wxHORIZONTAL)
 737     {
 738         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 739         if (max < 0) max = 0;
 740
 741         if (pos > max) pos = 0;
 742         if (pos < 0) pos = 0;
 743
 744         if (pos == (int)(m_hAdjust->value+0.5)) return;
 745         m_hAdjust->value = pos;
 746     }
 747     else
 748     {
 749         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 750         if (max < 0) max = 0;
 751
 752         if (pos > max) pos = 0;
 753         if (pos < 0) pos = 0;
 754
 755         if (pos == (int)(m_vAdjust->value+0.5)) return;
 756         m_vAdjust->value = pos;
 757     }
 758
 759     if (m_wxwindow->window)
 760     {
 761         if (orient == wxHORIZONTAL)
 762         {
 763             // Just update the scrollbar, don't send any wxWindows event
 764             GtkHDisconnectEvent();
 765             gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 766             GtkHConnectEvent();
 767         }
 768         else
 769         {
 770             // Just update the scrollbar, don't send any wxWindows event
 771             GtkVDisconnectEvent();
 772             gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 773             GtkVConnectEvent();
 774         }
 775     }
 776 }
 777
 778 void wxScrolledWindow::GtkVConnectEvent()
 779 {
 780     gtk_signal_connect( GTK_OBJECT(m_vAdjust), "value_changed",
 781           (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 782 }
 783
 784 void wxScrolledWindow::GtkHConnectEvent()
 785 {
 786     gtk_signal_connect( GTK_OBJECT(m_hAdjust), "value_changed",
 787           (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 788 }
 789
 790 void wxScrolledWindow::GtkHDisconnectEvent()
 791 {
 792     gtk_signal_disconnect_by_func( GTK_OBJECT(m_hAdjust),
 793         (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 794 }
 795
 796 void wxScrolledWindow::GtkVDisconnectEvent()
 797 {
 798     gtk_signal_disconnect_by_func( GTK_OBJECT(m_vAdjust),
 799         (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 800 }
 801
 802 bool wxScrolledWindow::Layout()
 803 {
 804     if (GetSizer() && m_targetWindow == this)
 805     {
 806         // If we're the scroll target, take into account the
 807         // virtual size and scrolled position of the window.
 808
 809         int x, y, w, h;
 810         CalcScrolledPosition(0,0, &x,&y);
 811         GetVirtualSize(&w, &h);
 812         GetSizer()->SetDimension(x, y, w, h);
 813         return TRUE;
 814     }
 815     else
 816         return wxPanel::Layout();  // fall back to default for LayoutConstraints
 817 }
 818
 819 // ----------------------------------------------------------------------------
 820 // event handlers
 821 // ----------------------------------------------------------------------------
 822
 823 // Default OnSize resets scrollbars, if any
 824 void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 825 {
 826     if( m_targetWindow != this )
 827         m_targetWindow->SetVirtualSize( m_targetWindow->GetClientSize() );
 828
 829     SetVirtualSize( GetClientSize() );
 830 }
 831
 832 // This calls OnDraw, having adjusted the origin according to the current
 833 // scroll position
 834 void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 835 {
 836     wxPaintDC dc(this);
 837     PrepareDC(dc);
 838
 839     OnDraw(dc);
 840 }
 841
 842 // kbd handling: notice that we use OnChar() and not OnKeyDown() for
 843 // compatibility here - if we used OnKeyDown(), the programs which process
 844 // arrows themselves in their OnChar() would never get the message and like
 845 // this they always have the priority
 846 void wxScrolledWindow::OnChar(wxKeyEvent& event)
 847 {
 848     int stx, sty,       // view origin
 849         szx, szy,       // view size (total)
 850         clix, cliy;     // view size (on screen)
 851
 852     ViewStart(&stx, &sty);
 853     GetClientSize(&clix, &cliy);
 854     GetVirtualSize(&szx, &szy);
 855
 856     if( m_xScrollPixelsPerLine )
 857     {
 858         clix /= m_xScrollPixelsPerLine;
 859         szx /= m_xScrollPixelsPerLine;
 860     }
 861     else
 862     {
 863         clix = 0;
 864         szx = -1;
 865     }
 866     if( m_yScrollPixelsPerLine )
 867     {
 868         cliy /= m_yScrollPixelsPerLine;
 869         szy /= m_yScrollPixelsPerLine;
 870     }
 871     else
 872     {
 873         cliy = 0;
 874         szy = -1;
 875     }
 876
 877     int xScrollOld = GetScrollPos(wxHORIZONTAL),
 878         yScrollOld = GetScrollPos(wxVERTICAL);
 879
 880     int dsty;
 881     switch ( event.KeyCode() )
 882     {
 883         case WXK_PAGEUP:
 884         case WXK_PRIOR:
 885             dsty = sty - (5 * cliy / 6);
 886             Scroll(-1, (dsty == -1) ? 0 : dsty);
 887             break;
 888
 889         case WXK_PAGEDOWN:
 890         case WXK_NEXT:
 891             Scroll(-1, sty + (5 * cliy / 6));
 892             break;
 893
 894         case WXK_HOME:
 895             Scroll(0, event.ControlDown() ? 0 : -1);
 896             break;
 897
 898         case WXK_END:
 899             Scroll(szx - clix, event.ControlDown() ? szy - cliy : -1);
 900             break;
 901
 902         case WXK_UP:
 903             Scroll(-1, sty - 1);
 904             break;
 905
 906         case WXK_DOWN:
 907             Scroll(-1, sty + 1);
 908             break;
 909
 910         case WXK_LEFT:
 911             Scroll(stx - 1, -1);
 912             break;
 913
 914         case WXK_RIGHT:
 915             Scroll(stx + 1, -1);
 916             break;
 917
 918         default:
 919             // not for us
 920             event.Skip();
 921             return;
 922     }
 923
 924     int xScroll = GetScrollPos(wxHORIZONTAL);
 925     if ( xScroll != xScrollOld )
 926     {
 927         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, xScroll,
 928                                wxHORIZONTAL);
 929         event.SetEventObject(this);
 930         GetEventHandler()->ProcessEvent(event);
 931     }
 932
 933     int yScroll = GetScrollPos(wxVERTICAL);
 934     if ( yScroll != yScrollOld )
 935     {
 936         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, yScroll,
 937                                wxVERTICAL);
 938         event.SetEventObject(this);
 939         GetEventHandler()->ProcessEvent(event);
 940     }
 941 }
 942
 943
 944 // vi:sts=4:sw=4:et