src/gtk1/scrolwin.cpp

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