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
 330 /*
 331  * pixelsPerUnitX/pixelsPerUnitY: number of pixels per unit (e.g. pixels per text line)
 332  * noUnitsX/noUnitsY:        : no. units per scrollbar
 333  */
 334 void wxScrolledWindow::SetScrollbars( int pixelsPerUnitX, int pixelsPerUnitY,
 335                                       int noUnitsX, int noUnitsY,
 336                                       int xPos, int yPos, bool noRefresh )
 337 {
 338     int old_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 339     int old_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 340
 341     m_xScrollPixelsPerLine = pixelsPerUnitX;
 342     m_yScrollPixelsPerLine = pixelsPerUnitY;
 343
 344     m_hAdjust->value = m_xScrollPosition = xPos;
 345     m_vAdjust->value = m_yScrollPosition = yPos;
 346
 347     m_targetWindow->SetVirtualSizeHints( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY );
 348
 349     if (!noRefresh)
 350     {
 351         int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 352         int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 353
 354         m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
 355     }
 356 }
 357
 358 void wxScrolledWindow::AdjustScrollbars()
 359 {
 360     int w, h;
 361     int vw, vh;
 362
 363     m_targetWindow->GetClientSize( &w, &h );
 364     m_targetWindow->GetVirtualSize( &vw, &vh );
 365
 366     if (m_xScrollPixelsPerLine == 0)
 367     {
 368         m_hAdjust->upper = 1.0;
 369         m_hAdjust->page_size = 1.0;
 370     }
 371     else
 372     {
 373         m_hAdjust->upper = vw / m_xScrollPixelsPerLine;
 374         m_hAdjust->page_size = (w / m_xScrollPixelsPerLine);
 375
 376         // If the scrollbar hits the right side, move the window
 377         // right to keep it from over extending.
 378
 379         if( m_hAdjust->value + m_hAdjust->page_size > m_hAdjust->upper )
 380         {
 381             m_hAdjust->value = m_hAdjust->upper - m_hAdjust->page_size;
 382             m_xScrollPosition = (int)m_hAdjust->value;
 383         }
 384     }
 385
 386     if (m_yScrollPixelsPerLine == 0)
 387     {
 388         m_vAdjust->upper = 1.0;
 389         m_vAdjust->page_size = 1.0;
 390     }
 391     else
 392     {
 393         m_vAdjust->upper = vh / m_yScrollPixelsPerLine;
 394         m_vAdjust->page_size = (h / m_yScrollPixelsPerLine);
 395
 396         if( m_vAdjust->value + m_vAdjust->page_size > m_vAdjust->upper )
 397         {
 398             m_vAdjust->value = m_vAdjust->upper - m_vAdjust->page_size;
 399             m_yScrollPosition = (int)m_vAdjust->value;
 400         }
 401     }
 402
 403     m_xScrollLinesPerPage = (int)(m_hAdjust->page_size + 0.5);
 404     m_yScrollLinesPerPage = (int)(m_vAdjust->page_size + 0.5);
 405
 406     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 407     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 408 }
 409
 410
 411 // ----------------------------------------------------------------------------
 412 // target window handling
 413 // ----------------------------------------------------------------------------
 414
 415 void wxScrolledWindow::SetTargetWindow( wxWindow *target, bool WXUNUSED(pushEventHandler) )
 416 {
 417     wxASSERT_MSG( target, wxT("target window must not be NULL") );
 418     m_targetWindow = target;
 419 }
 420
 421 wxWindow *wxScrolledWindow::GetTargetWindow()
 422 {
 423     return m_targetWindow;
 424 }
 425
 426 // Override this function if you don't want to have wxScrolledWindow
 427 // automatically change the origin according to the scroll position.
 428 void wxScrolledWindow::PrepareDC(wxDC& dc)
 429 {
 430     dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,
 431                         -m_yScrollPosition * m_yScrollPixelsPerLine );
 432 }
 433
 434 void wxScrolledWindow::SetScrollRate( int xstep, int ystep )
 435 {
 436     int old_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 437     int old_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 438
 439     m_xScrollPixelsPerLine = xstep;
 440     m_yScrollPixelsPerLine = ystep;
 441
 442     int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 443     int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 444
 445     m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
 446
 447     AdjustScrollbars();
 448 }
 449
 450 void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 451 {
 452     if ( x_unit )
 453         *x_unit = m_xScrollPixelsPerLine;
 454     if ( y_unit )
 455         *y_unit = m_yScrollPixelsPerLine;
 456 }
 457
 458 int wxScrolledWindow::GetScrollPageSize(int orient) const
 459 {
 460     if ( orient == wxHORIZONTAL )
 461         return m_xScrollLinesPerPage;
 462     else
 463         return m_yScrollLinesPerPage;
 464 }
 465
 466 void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
 467 {
 468     if ( orient == wxHORIZONTAL )
 469         m_xScrollLinesPerPage = pageSize;
 470     else
 471         m_yScrollLinesPerPage = pageSize;
 472 }
 473
 474 void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)
 475 {
 476     int orient = event.GetOrientation();
 477
 478     int nScrollInc = CalcScrollInc(event);
 479     if (nScrollInc == 0) return;
 480
 481     if (orient == wxHORIZONTAL)
 482     {
 483         int newPos = m_xScrollPosition + nScrollInc;
 484         SetScrollPos(wxHORIZONTAL, newPos, TRUE );
 485     }
 486     else
 487     {
 488         int newPos = m_yScrollPosition + nScrollInc;
 489         SetScrollPos(wxVERTICAL, newPos, TRUE );
 490     }
 491
 492     if (orient == wxHORIZONTAL)
 493     {
 494         m_xScrollPosition += nScrollInc;
 495     }
 496     else
 497     {
 498         m_yScrollPosition += nScrollInc;
 499     }
 500
 501     if (orient == wxHORIZONTAL)
 502     {
 503        if (m_xScrollingEnabled)
 504             m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
 505        else
 506             m_targetWindow->Refresh();
 507     }
 508     else
 509     {
 510         if (m_yScrollingEnabled)
 511             m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
 512         else
 513             m_targetWindow->Refresh();
 514     }
 515 }
 516
 517 void wxScrolledWindow::Scroll( int x_pos, int y_pos )
 518 {
 519     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 520
 521     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
 522         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
 523
 524     if ((x_pos != -1) && (m_xScrollPixelsPerLine))
 525     {
 526         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 527         if (max < 0) max = 0;
 528         if (x_pos > max) x_pos = max;
 529         if (x_pos < 0) x_pos = 0;
 530
 531         int old_x = m_xScrollPosition;
 532         m_xScrollPosition = x_pos;
 533         m_hAdjust->value = x_pos;
 534
 535         m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
 536
 537         // Just update the scrollbar, don't send any wxWindows event
 538         GtkHDisconnectEvent();
 539         gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 540         GtkHConnectEvent();
 541     }
 542
 543     if ((y_pos != -1) && (m_yScrollPixelsPerLine))
 544     {
 545         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 546         if (max < 0) max = 0;
 547         if (y_pos > max) y_pos = max;
 548         if (y_pos < 0) y_pos = 0;
 549
 550         int old_y = m_yScrollPosition;
 551         m_yScrollPosition = y_pos;
 552         m_vAdjust->value = y_pos;
 553
 554         m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
 555
 556         // Just update the scrollbar, don't send any wxWindows event
 557         GtkVDisconnectEvent();
 558         gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 559         GtkVConnectEvent();
 560     }
 561 }
 562
 563 // TODO: [VH]Scroll functions should be combined
 564
 565 void wxScrolledWindow::GtkVScroll( float value, unsigned int scroll_type )
 566 {
 567     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 568
 569     if (m_yScrollPixelsPerLine == 0)
 570         return;
 571
 572     int y_pos = (int)(value+0.5);
 573
 574     if (y_pos == m_yScrollPosition)
 575         return;
 576
 577     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 578
 579     wxScrollWinEvent event( command, y_pos, wxVERTICAL );
 580     event.SetEventObject( this );
 581     GetEventHandler()->ProcessEvent( event );
 582 }
 583
 584 void wxScrolledWindow::GtkHScroll( float value, unsigned int scroll_type )
 585 {
 586     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 587
 588     if (m_xScrollPixelsPerLine == 0)
 589         return;
 590
 591     int x_pos = (int)(value+0.5);
 592
 593     if (x_pos == m_xScrollPosition)
 594         return;
 595
 596     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 597
 598     wxScrollWinEvent event( command, x_pos, wxHORIZONTAL );
 599     event.SetEventObject( this );
 600     GetEventHandler()->ProcessEvent( event );
 601 }
 602
 603 void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
 604 {
 605     m_xScrollingEnabled = x_scroll;
 606     m_yScrollingEnabled = y_scroll;
 607 }
 608
 609 // Where the current view starts from
 610 void wxScrolledWindow::GetViewStart (int *x, int *y) const
 611 {
 612     if ( x )
 613         *x = m_xScrollPosition;
 614     if ( y )
 615         *y = m_yScrollPosition;
 616 }
 617
 618 void wxScrolledWindow::DoCalcScrolledPosition(int x, int y, int *xx, int *yy) const
 619 {
 620     if ( xx )
 621         *xx = x - m_xScrollPosition * m_xScrollPixelsPerLine;
 622     if ( yy )
 623         *yy = y - m_yScrollPosition * m_yScrollPixelsPerLine;
 624 }
 625
 626 void wxScrolledWindow::DoCalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
 627 {
 628     if ( xx )
 629         *xx = x + m_xScrollPosition * m_xScrollPixelsPerLine;
 630     if ( yy )
 631         *yy = y + m_yScrollPosition * m_yScrollPixelsPerLine;
 632 }
 633
 634 int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
 635 {
 636     int pos = event.GetPosition();
 637     int orient = event.GetOrientation();
 638
 639     int nScrollInc = 0;
 640     if (event.GetEventType() == wxEVT_SCROLLWIN_TOP)
 641     {
 642             if (orient == wxHORIZONTAL)
 643                 nScrollInc = - m_xScrollPosition;
 644             else
 645                 nScrollInc = - m_yScrollPosition;
 646     } else
 647     if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
 648     {
 649             if (orient == wxHORIZONTAL)
 650                 nScrollInc = GetVirtualSize().GetWidth() / m_xScrollPixelsPerLine - m_xScrollPosition;
 651             else
 652                 nScrollInc = GetVirtualSize().GetHeight() / m_yScrollPixelsPerLine - m_yScrollPosition;
 653     } else
 654     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
 655     {
 656             nScrollInc = -1;
 657     } else
 658     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN)
 659     {
 660             nScrollInc = 1;
 661     } else
 662     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEUP)
 663     {
 664             if (orient == wxHORIZONTAL)
 665                 nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
 666             else
 667                 nScrollInc = -GetScrollPageSize(wxVERTICAL);
 668     } else
 669     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEDOWN)
 670     {
 671             if (orient == wxHORIZONTAL)
 672                 nScrollInc = GetScrollPageSize(wxHORIZONTAL);
 673             else
 674                 nScrollInc = GetScrollPageSize(wxVERTICAL);
 675     } else
 676     if ((event.GetEventType() == wxEVT_SCROLLWIN_THUMBTRACK) ||
 677         (event.GetEventType() == wxEVT_SCROLLWIN_THUMBRELEASE))
 678     {
 679             if (orient == wxHORIZONTAL)
 680                 nScrollInc = pos - m_xScrollPosition;
 681             else
 682                 nScrollInc = pos - m_yScrollPosition;
 683     }
 684
 685     if (orient == wxHORIZONTAL)
 686     {
 687         if (m_xScrollPixelsPerLine > 0)
 688         {
 689             int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 690             if (max < 0) max = 0;
 691
 692             if ( (m_xScrollPosition + nScrollInc) < 0 )
 693                 nScrollInc = -m_xScrollPosition; // As -ve as we can go
 694             else if ( (m_xScrollPosition + nScrollInc) > max )
 695                 nScrollInc = max - m_xScrollPosition; // As +ve as we can go
 696         }
 697         else
 698             m_targetWindow->Refresh();
 699     }
 700     else
 701     {
 702         if (m_yScrollPixelsPerLine > 0)
 703         {
 704             int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 705             if (max < 0) max = 0;
 706
 707             if ( (m_yScrollPosition + nScrollInc) < 0 )
 708                 nScrollInc = -m_yScrollPosition; // As -ve as we can go
 709             else if ( (m_yScrollPosition + nScrollInc) > max )
 710                 nScrollInc = max - m_yScrollPosition; // As +ve as we can go
 711         }
 712         else
 713             m_targetWindow->Refresh();
 714     }
 715
 716     return nScrollInc;
 717 }
 718
 719 void wxScrolledWindow::SetScrollPos( int orient, int pos, bool refresh )
 720 {
 721     wxCHECK_RET( m_widget != NULL, wxT("invalid window") );
 722
 723     wxCHECK_RET( m_wxwindow != NULL, wxT("window needs client area for scrolling") );
 724
 725     if (orient == wxHORIZONTAL)
 726     {
 727         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 728         if (max < 0) max = 0;
 729
 730         if (pos > max) pos = 0;
 731         if (pos < 0) pos = 0;
 732
 733         if (pos == (int)(m_hAdjust->value+0.5)) return;
 734         m_hAdjust->value = pos;
 735     }
 736     else
 737     {
 738         int max = (int)(m_vAdjust->upper - m_vAdjust->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_vAdjust->value+0.5)) return;
 745         m_vAdjust->value = pos;
 746     }
 747
 748     if (m_wxwindow->window)
 749     {
 750         if (orient == wxHORIZONTAL)
 751         {
 752             // Just update the scrollbar, don't send any wxWindows event
 753             GtkHDisconnectEvent();
 754             gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 755             GtkHConnectEvent();
 756         }
 757         else
 758         {
 759             // Just update the scrollbar, don't send any wxWindows event
 760             GtkVDisconnectEvent();
 761             gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 762             GtkVConnectEvent();
 763         }
 764     }
 765 }
 766
 767 void wxScrolledWindow::GtkVConnectEvent()
 768 {
 769     gtk_signal_connect( GTK_OBJECT(m_vAdjust), "value_changed",
 770           (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 771 }
 772
 773 void wxScrolledWindow::GtkHConnectEvent()
 774 {
 775     gtk_signal_connect( GTK_OBJECT(m_hAdjust), "value_changed",
 776           (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 777 }
 778
 779 void wxScrolledWindow::GtkHDisconnectEvent()
 780 {
 781     gtk_signal_disconnect_by_func( GTK_OBJECT(m_hAdjust),
 782         (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 783 }
 784
 785 void wxScrolledWindow::GtkVDisconnectEvent()
 786 {
 787     gtk_signal_disconnect_by_func( GTK_OBJECT(m_vAdjust),
 788         (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 789 }
 790
 791 bool wxScrolledWindow::Layout()
 792 {
 793     if (GetSizer() && m_targetWindow == this)
 794     {
 795         // If we're the scroll target, take into account the
 796         // virtual size and scrolled position of the window.
 797
 798         int x, y, w, h;
 799         CalcScrolledPosition(0,0, &x,&y);
 800         GetVirtualSize(&w, &h);
 801         GetSizer()->SetDimension(x, y, w, h);
 802         return TRUE;
 803     }
 804     else
 805         return wxPanel::Layout();  // fall back to default for LayoutConstraints
 806 }
 807
 808 // ----------------------------------------------------------------------------
 809 // event handlers
 810 // ----------------------------------------------------------------------------
 811
 812 // Default OnSize resets scrollbars, if any
 813 void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 814 {
 815     if( m_targetWindow != this )
 816         m_targetWindow->SetVirtualSize( m_targetWindow->GetClientSize() );
 817
 818     SetVirtualSize( GetClientSize() );
 819
 820 #if wxUSE_CONSTRAINTS
 821     if (GetAutoLayout())
 822         Layout();
 823 #endif
 824 }
 825
 826 // This calls OnDraw, having adjusted the origin according to the current
 827 // scroll position
 828 void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 829 {
 830     wxPaintDC dc(this);
 831     PrepareDC(dc);
 832
 833     OnDraw(dc);
 834 }
 835
 836 // kbd handling: notice that we use OnChar() and not OnKeyDown() for
 837 // compatibility here - if we used OnKeyDown(), the programs which process
 838 // arrows themselves in their OnChar() would never get the message and like
 839 // this they always have the priority
 840 void wxScrolledWindow::OnChar(wxKeyEvent& event)
 841 {
 842     int stx, sty,       // view origin
 843         szx, szy,       // view size (total)
 844         clix, cliy;     // view size (on screen)
 845
 846     ViewStart(&stx, &sty);
 847     GetClientSize(&clix, &cliy);
 848     GetVirtualSize(&szx, &szy);
 849
 850     if( m_xScrollPixelsPerLine )
 851     {
 852         clix /= m_xScrollPixelsPerLine;
 853         szx /= m_xScrollPixelsPerLine;
 854     }
 855     else
 856     {
 857         clix = 0;
 858         szx = -1;
 859     }
 860     if( m_yScrollPixelsPerLine )
 861     {
 862         cliy /= m_yScrollPixelsPerLine;
 863         szy /= m_yScrollPixelsPerLine;
 864     }
 865     else
 866     {
 867         cliy = 0;
 868         szy = -1;
 869     }
 870
 871     int xScrollOld = GetScrollPos(wxHORIZONTAL),
 872         yScrollOld = GetScrollPos(wxVERTICAL);
 873
 874     int dsty;
 875     switch ( event.KeyCode() )
 876     {
 877         case WXK_PAGEUP:
 878         case WXK_PRIOR:
 879             dsty = sty - (5 * cliy / 6);
 880             Scroll(-1, (dsty == -1) ? 0 : dsty);
 881             break;
 882
 883         case WXK_PAGEDOWN:
 884         case WXK_NEXT:
 885             Scroll(-1, sty + (5 * cliy / 6));
 886             break;
 887
 888         case WXK_HOME:
 889             Scroll(0, event.ControlDown() ? 0 : -1);
 890             break;
 891
 892         case WXK_END:
 893             Scroll(szx - clix, event.ControlDown() ? szy - cliy : -1);
 894             break;
 895
 896         case WXK_UP:
 897             Scroll(-1, sty - 1);
 898             break;
 899
 900         case WXK_DOWN:
 901             Scroll(-1, sty + 1);
 902             break;
 903
 904         case WXK_LEFT:
 905             Scroll(stx - 1, -1);
 906             break;
 907
 908         case WXK_RIGHT:
 909             Scroll(stx + 1, -1);
 910             break;
 911
 912         default:
 913             // not for us
 914             event.Skip();
 915             return;
 916     }
 917
 918     int xScroll = GetScrollPos(wxHORIZONTAL);
 919     if ( xScroll != xScrollOld )
 920     {
 921         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, xScroll,
 922                                wxHORIZONTAL);
 923         event.SetEventObject(this);
 924         GetEventHandler()->ProcessEvent(event);
 925     }
 926
 927     int yScroll = GetScrollPos(wxVERTICAL);
 928     if ( yScroll != yScrollOld )
 929     {
 930         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, yScroll,
 931                                wxVERTICAL);
 932         event.SetEventObject(this);
 933         GetEventHandler()->ProcessEvent(event);
 934     }
 935 }
 936
 937
 938 // vi:sts=4:sw=4:et