src/gtk/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     PostCreation();
 303
 304     Show( TRUE );
 305
 306     return TRUE;
 307 }
 308
 309 // ----------------------------------------------------------------------------
 310 // setting scrolling parameters
 311 // ----------------------------------------------------------------------------
 312
 313 /*
 314  * pixelsPerUnitX/pixelsPerUnitY: number of pixels per unit (e.g. pixels per text line)
 315  * noUnitsX/noUnitsY:        : no. units per scrollbar
 316  */
 317 void wxScrolledWindow::SetScrollbars (int pixelsPerUnitX, int pixelsPerUnitY,
 318                int noUnitsX, int noUnitsY,
 319                int xPos, int yPos, bool noRefresh )
 320 {
 321     int old_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 322     int old_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 323
 324     m_xScrollPixelsPerLine = pixelsPerUnitX;
 325     m_yScrollPixelsPerLine = pixelsPerUnitY;
 326     m_xScrollLines = noUnitsX;
 327     m_yScrollLines = noUnitsY;
 328     m_xScrollPosition = xPos;
 329     m_yScrollPosition = yPos;
 330
 331     m_hAdjust->lower = 0.0;
 332     m_hAdjust->upper = noUnitsX;
 333     m_hAdjust->value = xPos;
 334     m_hAdjust->step_increment = 1.0;
 335     m_hAdjust->page_increment = 2.0;
 336
 337     m_vAdjust->lower = 0.0;
 338     m_vAdjust->upper = noUnitsY;
 339     m_vAdjust->value = yPos;
 340     m_vAdjust->step_increment = 1.0;
 341     m_vAdjust->page_increment = 2.0;
 342
 343     AdjustScrollbars();
 344
 345     if (!noRefresh)
 346     {
 347         int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 348         int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 349
 350         m_targetWindow->ScrollWindow( old_x-new_x, old_y-new_y );
 351     }
 352 }
 353
 354 void wxScrolledWindow::AdjustScrollbars()
 355 {
 356     int w, h;
 357     m_targetWindow->GetClientSize( &w, &h );
 358
 359     if (m_xScrollPixelsPerLine == 0)
 360         m_hAdjust->page_size = 1.0;
 361     else
 362         m_hAdjust->page_size = (w / m_xScrollPixelsPerLine);
 363
 364     if (m_yScrollPixelsPerLine == 0)
 365         m_vAdjust->page_size = 1.0;
 366     else
 367         m_vAdjust->page_size = (h / m_yScrollPixelsPerLine);
 368
 369     m_xScrollLinesPerPage = (int)(m_hAdjust->page_size + 0.5);
 370     m_yScrollLinesPerPage = (int)(m_vAdjust->page_size + 0.5);
 371
 372     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 373     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 374 }
 375
 376 // ----------------------------------------------------------------------------
 377 // target window handling
 378 // ----------------------------------------------------------------------------
 379
 380 void wxScrolledWindow::SetTargetWindow( wxWindow *target )
 381 {
 382     wxASSERT_MSG( target, wxT("target window must not be NULL") );
 383     m_targetWindow = target;
 384 }
 385
 386 wxWindow *wxScrolledWindow::GetTargetWindow()
 387 {
 388     return m_targetWindow;
 389 }
 390
 391 // Override this function if you don't want to have wxScrolledWindow
 392 // automatically change the origin according to the scroll position.
 393 void wxScrolledWindow::PrepareDC(wxDC& dc)
 394 {
 395     dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,
 396                         -m_yScrollPosition * m_yScrollPixelsPerLine );
 397 }
 398
 399 void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 400 {
 401     if ( x_unit )
 402         *x_unit = m_xScrollPixelsPerLine;
 403     if ( y_unit )
 404         *y_unit = m_yScrollPixelsPerLine;
 405 }
 406
 407 int wxScrolledWindow::GetScrollPageSize(int orient) const
 408 {
 409     if ( orient == wxHORIZONTAL )
 410         return m_xScrollLinesPerPage;
 411     else
 412         return m_yScrollLinesPerPage;
 413 }
 414
 415 void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
 416 {
 417     if ( orient == wxHORIZONTAL )
 418         m_xScrollLinesPerPage = pageSize;
 419     else
 420         m_yScrollLinesPerPage = pageSize;
 421 }
 422
 423 void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)
 424 {
 425     int orient = event.GetOrientation();
 426
 427     int nScrollInc = CalcScrollInc(event);
 428     if (nScrollInc == 0) return;
 429
 430     if (orient == wxHORIZONTAL)
 431     {
 432         int newPos = m_xScrollPosition + nScrollInc;
 433         SetScrollPos(wxHORIZONTAL, newPos, TRUE );
 434     }
 435     else
 436     {
 437         int newPos = m_yScrollPosition + nScrollInc;
 438         SetScrollPos(wxVERTICAL, newPos, TRUE );
 439     }
 440
 441     if (orient == wxHORIZONTAL)
 442     {
 443         m_xScrollPosition += nScrollInc;
 444     }
 445     else
 446     {
 447         m_yScrollPosition += nScrollInc;
 448     }
 449
 450     if (orient == wxHORIZONTAL)
 451     {
 452        if (m_xScrollingEnabled)
 453             m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
 454        else
 455             m_targetWindow->Refresh();
 456     }
 457     else
 458     {
 459         if (m_yScrollingEnabled)
 460             m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
 461         else
 462             m_targetWindow->Refresh();
 463     }
 464 }
 465
 466 void wxScrolledWindow::Scroll( int x_pos, int y_pos )
 467 {
 468     if (!m_targetWindow)
 469         return;
 470
 471     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
 472         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
 473
 474     if ((x_pos != -1) && (m_xScrollPixelsPerLine))
 475     {
 476         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 477         if (max < 0) max = 0;
 478         if (x_pos > max) x_pos = max;
 479         if (x_pos < 0) x_pos = 0;
 480
 481         int old_x = m_xScrollPosition;
 482         m_xScrollPosition = x_pos;
 483         m_hAdjust->value = x_pos;
 484
 485         m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
 486
 487         // Just update the scrollbar, don't send any wxWindows event
 488         GtkHDisconnectEvent();
 489         gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 490         GtkHConnectEvent();
 491     }
 492
 493     if ((y_pos != -1) && (m_yScrollPixelsPerLine))
 494     {
 495         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 496         if (max < 0) max = 0;
 497         if (y_pos > max) y_pos = max;
 498         if (y_pos < 0) y_pos = 0;
 499
 500         int old_y = m_yScrollPosition;
 501         m_yScrollPosition = y_pos;
 502         m_vAdjust->value = y_pos;
 503
 504         m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
 505
 506         // Just update the scrollbar, don't send any wxWindows event
 507         GtkVDisconnectEvent();
 508         gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 509         GtkVConnectEvent();
 510     }
 511 }
 512
 513 void wxScrolledWindow::GtkVScroll( float value )
 514 {
 515     if (!m_targetWindow)
 516         return;
 517
 518     if (m_yScrollPixelsPerLine == 0)
 519         return;
 520
 521     int y_pos = (int)(value+0.5);
 522
 523     if (y_pos == m_yScrollPosition)
 524         return;
 525
 526     GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(m_widget);
 527     GtkRange *range = GTK_RANGE(scrolledWindow->vscrollbar);
 528
 529     wxEventType command = wxEVT_SCROLLWIN_THUMBTRACK;
 530     if      (range->scroll_type == GTK_SCROLL_STEP_BACKWARD) command = wxEVT_SCROLLWIN_LINEUP;
 531     else if (range->scroll_type == GTK_SCROLL_STEP_FORWARD)  command = wxEVT_SCROLLWIN_LINEDOWN;
 532     else if (range->scroll_type == GTK_SCROLL_PAGE_BACKWARD) command = wxEVT_SCROLLWIN_PAGEUP;
 533     else if (range->scroll_type == GTK_SCROLL_PAGE_FORWARD)  command = wxEVT_SCROLLWIN_PAGEDOWN;
 534
 535     wxScrollWinEvent event( command, y_pos, wxVERTICAL );
 536     event.SetEventObject( this );
 537     GetEventHandler()->ProcessEvent( event );
 538 }
 539
 540 void wxScrolledWindow::GtkHScroll( float value )
 541 {
 542     if (!m_targetWindow)
 543         return;
 544
 545     if (m_xScrollPixelsPerLine == 0)
 546         return;
 547
 548     int x_pos = (int)(value+0.5);
 549
 550     if (x_pos == m_xScrollPosition)
 551         return;
 552
 553     GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(m_widget);
 554     GtkRange *range = GTK_RANGE(scrolledWindow->hscrollbar);
 555
 556     wxEventType command = wxEVT_SCROLLWIN_THUMBTRACK;
 557     if      (range->scroll_type == GTK_SCROLL_STEP_BACKWARD) command = wxEVT_SCROLLWIN_LINEUP;
 558     else if (range->scroll_type == GTK_SCROLL_STEP_FORWARD)  command = wxEVT_SCROLLWIN_LINEDOWN;
 559     else if (range->scroll_type == GTK_SCROLL_PAGE_BACKWARD) command = wxEVT_SCROLLWIN_PAGEUP;
 560     else if (range->scroll_type == GTK_SCROLL_PAGE_FORWARD)  command = wxEVT_SCROLLWIN_PAGEDOWN;
 561
 562     wxScrollWinEvent event( command, x_pos, wxHORIZONTAL );
 563     event.SetEventObject( this );
 564     GetEventHandler()->ProcessEvent( event );
 565 }
 566
 567 void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
 568 {
 569     m_xScrollingEnabled = x_scroll;
 570     m_yScrollingEnabled = y_scroll;
 571 }
 572
 573 void wxScrolledWindow::GetVirtualSize (int *x, int *y) const
 574 {
 575     if ( x )
 576         *x = m_xScrollPixelsPerLine * m_xScrollLines;
 577     if ( y )
 578         *y = m_yScrollPixelsPerLine * m_yScrollLines;
 579 }
 580
 581 // Where the current view starts from
 582 void wxScrolledWindow::GetViewStart (int *x, int *y) const
 583 {
 584     if ( x )
 585         *x = m_xScrollPosition;
 586     if ( y )
 587         *y = m_yScrollPosition;
 588 }
 589
 590 void wxScrolledWindow::CalcScrolledPosition(int x, int y, int *xx, int *yy) const
 591 {
 592     if ( xx )
 593         *xx = x - m_xScrollPosition * m_xScrollPixelsPerLine;
 594     if ( yy )
 595         *yy = y - m_yScrollPosition * m_yScrollPixelsPerLine;
 596 }
 597
 598 void wxScrolledWindow::CalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
 599 {
 600     if ( xx )
 601         *xx = x + m_xScrollPosition * m_xScrollPixelsPerLine;
 602     if ( yy )
 603         *yy = y + m_yScrollPosition * m_yScrollPixelsPerLine;
 604 }
 605
 606 int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
 607 {
 608     int pos = event.GetPosition();
 609     int orient = event.GetOrientation();
 610
 611     int nScrollInc = 0;
 612     if (event.GetEventType() == wxEVT_SCROLLWIN_TOP)
 613     {
 614             if (orient == wxHORIZONTAL)
 615                 nScrollInc = - m_xScrollPosition;
 616             else
 617                 nScrollInc = - m_yScrollPosition;
 618     } else
 619     if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
 620     {
 621             if (orient == wxHORIZONTAL)
 622                 nScrollInc = m_xScrollLines - m_xScrollPosition;
 623             else
 624                 nScrollInc = m_yScrollLines - m_yScrollPosition;
 625     } else
 626     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
 627     {
 628             nScrollInc = -1;
 629     } else
 630     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN)
 631     {
 632             nScrollInc = 1;
 633     } else
 634     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEUP)
 635     {
 636             if (orient == wxHORIZONTAL)
 637                 nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
 638             else
 639                 nScrollInc = -GetScrollPageSize(wxVERTICAL);
 640     } else
 641     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEDOWN)
 642     {
 643             if (orient == wxHORIZONTAL)
 644                 nScrollInc = GetScrollPageSize(wxHORIZONTAL);
 645             else
 646                 nScrollInc = GetScrollPageSize(wxVERTICAL);
 647     } else
 648     if ((event.GetEventType() == wxEVT_SCROLLWIN_THUMBTRACK) ||
 649         (event.GetEventType() == wxEVT_SCROLLWIN_THUMBRELEASE))
 650     {
 651             if (orient == wxHORIZONTAL)
 652                 nScrollInc = pos - m_xScrollPosition;
 653             else
 654                 nScrollInc = pos - m_yScrollPosition;
 655     }
 656
 657     if (orient == wxHORIZONTAL)
 658     {
 659         if (m_xScrollPixelsPerLine > 0)
 660         {
 661             int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 662             if (max < 0) max = 0;
 663
 664             if ( (m_xScrollPosition + nScrollInc) < 0 )
 665                 nScrollInc = -m_xScrollPosition; // As -ve as we can go
 666             else if ( (m_xScrollPosition + nScrollInc) > max )
 667                 nScrollInc = max - m_xScrollPosition; // As +ve as we can go
 668         }
 669         else
 670             m_targetWindow->Refresh();
 671     }
 672     else
 673     {
 674         if (m_yScrollPixelsPerLine > 0)
 675         {
 676             int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 677             if (max < 0) max = 0;
 678
 679             if ( (m_yScrollPosition + nScrollInc) < 0 )
 680                 nScrollInc = -m_yScrollPosition; // As -ve as we can go
 681             else if ( (m_yScrollPosition + nScrollInc) > max )
 682                 nScrollInc = max - m_yScrollPosition; // As +ve as we can go
 683         }
 684         else
 685             m_targetWindow->Refresh();
 686     }
 687
 688     return nScrollInc;
 689 }
 690
 691 void wxScrolledWindow::SetScrollPos( int orient, int pos, bool WXUNUSED(refresh) )
 692 {
 693     wxCHECK_RET( m_widget != NULL, wxT("invalid window") );
 694
 695     wxCHECK_RET( m_wxwindow != NULL, wxT("window needs client area for scrolling") );
 696
 697     if (orient == wxHORIZONTAL)
 698     {
 699         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 700         if (max < 0) max = 0;
 701
 702         if (pos > max) pos = 0;
 703         if (pos < 0) pos = 0;
 704
 705         if (pos == (int)(m_hAdjust->value+0.5)) return;
 706         m_hAdjust->value = pos;
 707     }
 708     else
 709     {
 710         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 711         if (max < 0) max = 0;
 712
 713         if (pos > max) pos = 0;
 714         if (pos < 0) pos = 0;
 715
 716         if (pos == (int)(m_vAdjust->value+0.5)) return;
 717         m_vAdjust->value = pos;
 718     }
 719
 720     if (m_wxwindow->window)
 721     {
 722         if (orient == wxHORIZONTAL)
 723         {
 724             // Just update the scrollbar, don't send any wxWindows event
 725             GtkHDisconnectEvent();
 726             gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 727             GtkHConnectEvent();
 728         }
 729         else
 730         {
 731             // Just update the scrollbar, don't send any wxWindows event
 732             GtkVDisconnectEvent();
 733             gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 734             GtkVConnectEvent();
 735         }
 736     }
 737 }
 738
 739 void wxScrolledWindow::GtkVConnectEvent()
 740 {
 741     gtk_signal_connect( GTK_OBJECT(m_vAdjust), "value_changed",
 742           (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 743 }
 744
 745 void wxScrolledWindow::GtkHConnectEvent()
 746 {
 747     gtk_signal_connect( GTK_OBJECT(m_hAdjust), "value_changed",
 748           (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 749 }
 750
 751 void wxScrolledWindow::GtkHDisconnectEvent()
 752 {
 753     gtk_signal_disconnect_by_func( GTK_OBJECT(m_hAdjust),
 754         (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 755 }
 756
 757 void wxScrolledWindow::GtkVDisconnectEvent()
 758 {
 759     gtk_signal_disconnect_by_func( GTK_OBJECT(m_vAdjust),
 760         (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 761 }
 762
 763 // ----------------------------------------------------------------------------
 764 // event handlers
 765 // ----------------------------------------------------------------------------
 766
 767 // Default OnSize resets scrollbars, if any
 768 void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 769 {
 770 #if wxUSE_CONSTRAINTS
 771     if (GetAutoLayout())
 772         Layout();
 773 #endif
 774
 775     AdjustScrollbars();
 776 }
 777
 778 // This calls OnDraw, having adjusted the origin according to the current
 779 // scroll position
 780 void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 781 {
 782     wxPaintDC dc(this);
 783     PrepareDC(dc);
 784
 785     OnDraw(dc);
 786 }
 787
 788 // kbd handling: notice that we use OnChar() and not OnKeyDown() for
 789 // compatibility here - if we used OnKeyDown(), the programs which process
 790 // arrows themselves in their OnChar() would never get the message and like
 791 // this they always have the priority
 792 void wxScrolledWindow::OnChar(wxKeyEvent& event)
 793 {
 794     int stx, sty,       // view origin
 795         szx, szy,       // view size (total)
 796         clix, cliy;     // view size (on screen)
 797
 798     ViewStart(&stx, &sty);
 799     GetClientSize(&clix, &cliy);
 800     GetVirtualSize(&szx, &szy);
 801
 802     if( m_xScrollPixelsPerLine )
 803     {
 804         clix /= m_xScrollPixelsPerLine;
 805         szx /= m_xScrollPixelsPerLine;
 806     }
 807     else
 808     {
 809         clix = 0;
 810         szx = -1;
 811     }
 812     if( m_yScrollPixelsPerLine )
 813     {
 814         cliy /= m_yScrollPixelsPerLine;
 815         szy /= m_yScrollPixelsPerLine;
 816     }
 817     else
 818     {
 819         cliy = 0;
 820         szy = -1;
 821     }
 822
 823     int xScrollOld = GetScrollPos(wxHORIZONTAL),
 824         yScrollOld = GetScrollPos(wxVERTICAL);
 825
 826     int dsty;
 827     switch ( event.KeyCode() )
 828     {
 829         case WXK_PAGEUP:
 830         case WXK_PRIOR:
 831             dsty = sty - (5 * cliy / 6);
 832             Scroll(-1, (dsty == -1) ? 0 : dsty);
 833             break;
 834
 835         case WXK_PAGEDOWN:
 836         case WXK_NEXT:
 837             Scroll(-1, sty + (5 * cliy / 6));
 838             break;
 839
 840         case WXK_HOME:
 841             Scroll(0, event.ControlDown() ? 0 : -1);
 842             break;
 843
 844         case WXK_END:
 845             Scroll(szx - clix, event.ControlDown() ? szy - cliy : -1);
 846             break;
 847
 848         case WXK_UP:
 849             Scroll(-1, sty - 1);
 850             break;
 851
 852         case WXK_DOWN:
 853             Scroll(-1, sty + 1);
 854             break;
 855
 856         case WXK_LEFT:
 857             Scroll(stx - 1, -1);
 858             break;
 859
 860         case WXK_RIGHT:
 861             Scroll(stx + 1, -1);
 862             break;
 863
 864         default:
 865             // not for us
 866             event.Skip();
 867             return;
 868     }
 869
 870     int xScroll = GetScrollPos(wxHORIZONTAL);
 871     if ( xScroll != xScrollOld )
 872     {
 873         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, xScroll,
 874                                wxHORIZONTAL);
 875         event.SetEventObject(this);
 876         GetEventHandler()->ProcessEvent(event);
 877     }
 878
 879     int yScroll = GetScrollPos(wxVERTICAL);
 880     if ( yScroll != yScrollOld )
 881     {
 882         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, yScroll,
 883                                wxVERTICAL);
 884         event.SetEventObject(this);
 885         GetEventHandler()->ProcessEvent(event);
 886     }
 887 }
 888