src/gtk1/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_targetWindow->ScrollWindow( (m_xScrollPosition - m_hAdjust->value) * m_xScrollPixelsPerLine, 0 );
 383             m_xScrollPosition = (int)m_hAdjust->value;
 384         }
 385     }
 386
 387     if (m_yScrollPixelsPerLine == 0)
 388     {
 389         m_vAdjust->upper = 1.0;
 390         m_vAdjust->page_size = 1.0;
 391     }
 392     else
 393     {
 394         m_vAdjust->upper = vh / m_yScrollPixelsPerLine;
 395         m_vAdjust->page_size = (h / m_yScrollPixelsPerLine);
 396
 397         if( m_vAdjust->value + m_vAdjust->page_size > m_vAdjust->upper )
 398         {
 399             m_vAdjust->value = m_vAdjust->upper - m_vAdjust->page_size;
 400             m_targetWindow->ScrollWindow( 0, (m_yScrollPosition - m_vAdjust->value) * m_yScrollPixelsPerLine );
 401             m_yScrollPosition = (int)m_vAdjust->value;
 402         }
 403     }
 404
 405     m_xScrollLinesPerPage = (int)(m_hAdjust->page_size + 0.5);
 406     m_yScrollLinesPerPage = (int)(m_vAdjust->page_size + 0.5);
 407
 408     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 409     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 410 }
 411
 412
 413 // ----------------------------------------------------------------------------
 414 // target window handling
 415 // ----------------------------------------------------------------------------
 416
 417 void wxScrolledWindow::SetTargetWindow( wxWindow *target, bool WXUNUSED(pushEventHandler) )
 418 {
 419     wxASSERT_MSG( target, wxT("target window must not be NULL") );
 420     m_targetWindow = target;
 421 }
 422
 423 wxWindow *wxScrolledWindow::GetTargetWindow()
 424 {
 425     return m_targetWindow;
 426 }
 427
 428 // Override this function if you don't want to have wxScrolledWindow
 429 // automatically change the origin according to the scroll position.
 430 void wxScrolledWindow::PrepareDC(wxDC& dc)
 431 {
 432     dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,
 433                         -m_yScrollPosition * m_yScrollPixelsPerLine );
 434 }
 435
 436 void wxScrolledWindow::SetScrollRate( int xstep, int ystep )
 437 {
 438     int old_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 439     int old_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 440
 441     m_xScrollPixelsPerLine = xstep;
 442     m_yScrollPixelsPerLine = ystep;
 443
 444     int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 445     int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 446
 447     m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
 448
 449     AdjustScrollbars();
 450 }
 451
 452 void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 453 {
 454     if ( x_unit )
 455         *x_unit = m_xScrollPixelsPerLine;
 456     if ( y_unit )
 457         *y_unit = m_yScrollPixelsPerLine;
 458 }
 459
 460 int wxScrolledWindow::GetScrollPageSize(int orient) const
 461 {
 462     if ( orient == wxHORIZONTAL )
 463         return m_xScrollLinesPerPage;
 464     else
 465         return m_yScrollLinesPerPage;
 466 }
 467
 468 void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
 469 {
 470     if ( orient == wxHORIZONTAL )
 471         m_xScrollLinesPerPage = pageSize;
 472     else
 473         m_yScrollLinesPerPage = pageSize;
 474 }
 475
 476 void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)
 477 {
 478     int orient = event.GetOrientation();
 479
 480     int nScrollInc = CalcScrollInc(event);
 481     if (nScrollInc == 0) return;
 482
 483     if (orient == wxHORIZONTAL)
 484     {
 485         int newPos = m_xScrollPosition + nScrollInc;
 486         SetScrollPos(wxHORIZONTAL, newPos, TRUE );
 487     }
 488     else
 489     {
 490         int newPos = m_yScrollPosition + nScrollInc;
 491         SetScrollPos(wxVERTICAL, newPos, TRUE );
 492     }
 493
 494     if (orient == wxHORIZONTAL)
 495     {
 496         m_xScrollPosition += nScrollInc;
 497     }
 498     else
 499     {
 500         m_yScrollPosition += nScrollInc;
 501     }
 502
 503     if (orient == wxHORIZONTAL)
 504     {
 505        if (m_xScrollingEnabled)
 506             m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
 507        else
 508             m_targetWindow->Refresh();
 509     }
 510     else
 511     {
 512         if (m_yScrollingEnabled)
 513             m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
 514         else
 515             m_targetWindow->Refresh();
 516     }
 517 }
 518
 519 void wxScrolledWindow::Scroll( int x_pos, int y_pos )
 520 {
 521     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 522
 523     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
 524         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
 525
 526     if ((x_pos != -1) && (m_xScrollPixelsPerLine))
 527     {
 528         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 529         if (max < 0) max = 0;
 530         if (x_pos > max) x_pos = max;
 531         if (x_pos < 0) x_pos = 0;
 532
 533         int old_x = m_xScrollPosition;
 534         m_xScrollPosition = x_pos;
 535         m_hAdjust->value = x_pos;
 536
 537         m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
 538
 539         // Just update the scrollbar, don't send any wxWindows event
 540         GtkHDisconnectEvent();
 541         gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 542         GtkHConnectEvent();
 543     }
 544
 545     if ((y_pos != -1) && (m_yScrollPixelsPerLine))
 546     {
 547         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 548         if (max < 0) max = 0;
 549         if (y_pos > max) y_pos = max;
 550         if (y_pos < 0) y_pos = 0;
 551
 552         int old_y = m_yScrollPosition;
 553         m_yScrollPosition = y_pos;
 554         m_vAdjust->value = y_pos;
 555
 556         m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
 557
 558         // Just update the scrollbar, don't send any wxWindows event
 559         GtkVDisconnectEvent();
 560         gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 561         GtkVConnectEvent();
 562     }
 563 }
 564
 565 // TODO: [VH]Scroll functions should be combined
 566
 567 void wxScrolledWindow::GtkVScroll( float value, unsigned int scroll_type )
 568 {
 569     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 570
 571     if (m_yScrollPixelsPerLine == 0)
 572         return;
 573
 574     int y_pos = (int)(value+0.5);
 575
 576     if (y_pos == m_yScrollPosition)
 577         return;
 578
 579     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 580
 581     wxScrollWinEvent event( command, y_pos, wxVERTICAL );
 582     event.SetEventObject( this );
 583     GetEventHandler()->ProcessEvent( event );
 584 }
 585
 586 void wxScrolledWindow::GtkHScroll( float value, unsigned int scroll_type )
 587 {
 588     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 589
 590     if (m_xScrollPixelsPerLine == 0)
 591         return;
 592
 593     int x_pos = (int)(value+0.5);
 594
 595     if (x_pos == m_xScrollPosition)
 596         return;
 597
 598     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 599
 600     wxScrollWinEvent event( command, x_pos, wxHORIZONTAL );
 601     event.SetEventObject( this );
 602     GetEventHandler()->ProcessEvent( event );
 603 }
 604
 605 void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
 606 {
 607     m_xScrollingEnabled = x_scroll;
 608     m_yScrollingEnabled = y_scroll;
 609 }
 610
 611 // Where the current view starts from
 612 void wxScrolledWindow::GetViewStart (int *x, int *y) const
 613 {
 614     if ( x )
 615         *x = m_xScrollPosition;
 616     if ( y )
 617         *y = m_yScrollPosition;
 618 }
 619
 620 void wxScrolledWindow::DoCalcScrolledPosition(int x, int y, int *xx, int *yy) const
 621 {
 622     if ( xx )
 623         *xx = x - m_xScrollPosition * m_xScrollPixelsPerLine;
 624     if ( yy )
 625         *yy = y - m_yScrollPosition * m_yScrollPixelsPerLine;
 626 }
 627
 628 void wxScrolledWindow::DoCalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
 629 {
 630     if ( xx )
 631         *xx = x + m_xScrollPosition * m_xScrollPixelsPerLine;
 632     if ( yy )
 633         *yy = y + m_yScrollPosition * m_yScrollPixelsPerLine;
 634 }
 635
 636 int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
 637 {
 638     int pos = event.GetPosition();
 639     int orient = event.GetOrientation();
 640
 641     int nScrollInc = 0;
 642     if (event.GetEventType() == wxEVT_SCROLLWIN_TOP)
 643     {
 644             if (orient == wxHORIZONTAL)
 645                 nScrollInc = - m_xScrollPosition;
 646             else
 647                 nScrollInc = - m_yScrollPosition;
 648     } else
 649     if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
 650     {
 651             if (orient == wxHORIZONTAL)
 652                 nScrollInc = GetVirtualSize().GetWidth() / m_xScrollPixelsPerLine - m_xScrollPosition;
 653             else
 654                 nScrollInc = GetVirtualSize().GetHeight() / m_yScrollPixelsPerLine - m_yScrollPosition;
 655     } else
 656     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
 657     {
 658             nScrollInc = -1;
 659     } else
 660     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN)
 661     {
 662             nScrollInc = 1;
 663     } else
 664     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEUP)
 665     {
 666             if (orient == wxHORIZONTAL)
 667                 nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
 668             else
 669                 nScrollInc = -GetScrollPageSize(wxVERTICAL);
 670     } else
 671     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEDOWN)
 672     {
 673             if (orient == wxHORIZONTAL)
 674                 nScrollInc = GetScrollPageSize(wxHORIZONTAL);
 675             else
 676                 nScrollInc = GetScrollPageSize(wxVERTICAL);
 677     } else
 678     if ((event.GetEventType() == wxEVT_SCROLLWIN_THUMBTRACK) ||
 679         (event.GetEventType() == wxEVT_SCROLLWIN_THUMBRELEASE))
 680     {
 681             if (orient == wxHORIZONTAL)
 682                 nScrollInc = pos - m_xScrollPosition;
 683             else
 684                 nScrollInc = pos - m_yScrollPosition;
 685     }
 686
 687     if (orient == wxHORIZONTAL)
 688     {
 689         if (m_xScrollPixelsPerLine > 0)
 690         {
 691             int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 692             if (max < 0) max = 0;
 693
 694             if ( (m_xScrollPosition + nScrollInc) < 0 )
 695                 nScrollInc = -m_xScrollPosition; // As -ve as we can go
 696             else if ( (m_xScrollPosition + nScrollInc) > max )
 697                 nScrollInc = max - m_xScrollPosition; // As +ve as we can go
 698         }
 699         else
 700             m_targetWindow->Refresh();
 701     }
 702     else
 703     {
 704         if (m_yScrollPixelsPerLine > 0)
 705         {
 706             int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 707             if (max < 0) max = 0;
 708
 709             if ( (m_yScrollPosition + nScrollInc) < 0 )
 710                 nScrollInc = -m_yScrollPosition; // As -ve as we can go
 711             else if ( (m_yScrollPosition + nScrollInc) > max )
 712                 nScrollInc = max - m_yScrollPosition; // As +ve as we can go
 713         }
 714         else
 715             m_targetWindow->Refresh();
 716     }
 717
 718     return nScrollInc;
 719 }
 720
 721 void wxScrolledWindow::SetScrollPos( int orient, int pos, bool refresh )
 722 {
 723     wxCHECK_RET( m_widget != NULL, wxT("invalid window") );
 724
 725     wxCHECK_RET( m_wxwindow != NULL, wxT("window needs client area for scrolling") );
 726
 727     if (orient == wxHORIZONTAL)
 728     {
 729         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 730         if (max < 0) max = 0;
 731
 732         if (pos > max) pos = 0;
 733         if (pos < 0) pos = 0;
 734
 735         if (pos == (int)(m_hAdjust->value+0.5)) return;
 736         m_hAdjust->value = pos;
 737     }
 738     else
 739     {
 740         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 741         if (max < 0) max = 0;
 742
 743         if (pos > max) pos = 0;
 744         if (pos < 0) pos = 0;
 745
 746         if (pos == (int)(m_vAdjust->value+0.5)) return;
 747         m_vAdjust->value = pos;
 748     }
 749
 750     if (m_wxwindow->window)
 751     {
 752         if (orient == wxHORIZONTAL)
 753         {
 754             // Just update the scrollbar, don't send any wxWindows event
 755             GtkHDisconnectEvent();
 756             gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 757             GtkHConnectEvent();
 758         }
 759         else
 760         {
 761             // Just update the scrollbar, don't send any wxWindows event
 762             GtkVDisconnectEvent();
 763             gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 764             GtkVConnectEvent();
 765         }
 766     }
 767 }
 768
 769 void wxScrolledWindow::GtkVConnectEvent()
 770 {
 771     gtk_signal_connect( GTK_OBJECT(m_vAdjust), "value_changed",
 772           (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 773 }
 774
 775 void wxScrolledWindow::GtkHConnectEvent()
 776 {
 777     gtk_signal_connect( GTK_OBJECT(m_hAdjust), "value_changed",
 778           (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 779 }
 780
 781 void wxScrolledWindow::GtkHDisconnectEvent()
 782 {
 783     gtk_signal_disconnect_by_func( GTK_OBJECT(m_hAdjust),
 784         (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 785 }
 786
 787 void wxScrolledWindow::GtkVDisconnectEvent()
 788 {
 789     gtk_signal_disconnect_by_func( GTK_OBJECT(m_vAdjust),
 790         (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 791 }
 792
 793 bool wxScrolledWindow::Layout()
 794 {
 795     if (GetSizer() && m_targetWindow == this)
 796     {
 797         // If we're the scroll target, take into account the
 798         // virtual size and scrolled position of the window.
 799
 800         int x, y, w, h;
 801         CalcScrolledPosition(0,0, &x,&y);
 802         GetVirtualSize(&w, &h);
 803         GetSizer()->SetDimension(x, y, w, h);
 804         return TRUE;
 805     }
 806     else
 807         return wxPanel::Layout();  // fall back to default for LayoutConstraints
 808 }
 809
 810 // ----------------------------------------------------------------------------
 811 // event handlers
 812 // ----------------------------------------------------------------------------
 813
 814 // Default OnSize resets scrollbars, if any
 815 void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 816 {
 817     if( m_targetWindow != this )
 818         m_targetWindow->SetVirtualSize( m_targetWindow->GetClientSize() );
 819
 820     SetVirtualSize( GetClientSize() );
 821
 822 #if wxUSE_CONSTRAINTS
 823     if (GetAutoLayout())
 824         Layout();
 825 #endif
 826 }
 827
 828 // This calls OnDraw, having adjusted the origin according to the current
 829 // scroll position
 830 void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 831 {
 832     wxPaintDC dc(this);
 833     PrepareDC(dc);
 834
 835     OnDraw(dc);
 836 }
 837
 838 // kbd handling: notice that we use OnChar() and not OnKeyDown() for
 839 // compatibility here - if we used OnKeyDown(), the programs which process
 840 // arrows themselves in their OnChar() would never get the message and like
 841 // this they always have the priority
 842 void wxScrolledWindow::OnChar(wxKeyEvent& event)
 843 {
 844     int stx, sty,       // view origin
 845         szx, szy,       // view size (total)
 846         clix, cliy;     // view size (on screen)
 847
 848     ViewStart(&stx, &sty);
 849     GetClientSize(&clix, &cliy);
 850     GetVirtualSize(&szx, &szy);
 851
 852     if( m_xScrollPixelsPerLine )
 853     {
 854         clix /= m_xScrollPixelsPerLine;
 855         szx /= m_xScrollPixelsPerLine;
 856     }
 857     else
 858     {
 859         clix = 0;
 860         szx = -1;
 861     }
 862     if( m_yScrollPixelsPerLine )
 863     {
 864         cliy /= m_yScrollPixelsPerLine;
 865         szy /= m_yScrollPixelsPerLine;
 866     }
 867     else
 868     {
 869         cliy = 0;
 870         szy = -1;
 871     }
 872
 873     int xScrollOld = GetScrollPos(wxHORIZONTAL),
 874         yScrollOld = GetScrollPos(wxVERTICAL);
 875
 876     int dsty;
 877     switch ( event.KeyCode() )
 878     {
 879         case WXK_PAGEUP:
 880         case WXK_PRIOR:
 881             dsty = sty - (5 * cliy / 6);
 882             Scroll(-1, (dsty == -1) ? 0 : dsty);
 883             break;
 884
 885         case WXK_PAGEDOWN:
 886         case WXK_NEXT:
 887             Scroll(-1, sty + (5 * cliy / 6));
 888             break;
 889
 890         case WXK_HOME:
 891             Scroll(0, event.ControlDown() ? 0 : -1);
 892             break;
 893
 894         case WXK_END:
 895             Scroll(szx - clix, event.ControlDown() ? szy - cliy : -1);
 896             break;
 897
 898         case WXK_UP:
 899             Scroll(-1, sty - 1);
 900             break;
 901
 902         case WXK_DOWN:
 903             Scroll(-1, sty + 1);
 904             break;
 905
 906         case WXK_LEFT:
 907             Scroll(stx - 1, -1);
 908             break;
 909
 910         case WXK_RIGHT:
 911             Scroll(stx + 1, -1);
 912             break;
 913
 914         default:
 915             // not for us
 916             event.Skip();
 917             return;
 918     }
 919
 920     int xScroll = GetScrollPos(wxHORIZONTAL);
 921     if ( xScroll != xScrollOld )
 922     {
 923         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, xScroll,
 924                                wxHORIZONTAL);
 925         event.SetEventObject(this);
 926         GetEventHandler()->ProcessEvent(event);
 927     }
 928
 929     int yScroll = GetScrollPos(wxVERTICAL);
 930     if ( yScroll != yScrollOld )
 931     {
 932         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, yScroll,
 933                                wxVERTICAL);
 934         event.SetEventObject(this);
 935         GetEventHandler()->ProcessEvent(event);
 936     }
 937 }
 938
 939
 940 // vi:sts=4:sw=4:et