src/gtk/scrolwin.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        gtk/scrolwin.cpp
   3 // Purpose:     wxScrolledWindow implementation
   4 // Author:      Robert Roebling
   5 // Modified by: Ron Lee
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Robert Roebling
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  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/scrolwin.h"
  32 #include "wx/utils.h"
  33 #include "wx/dcclient.h"
  34 #include "wx/panel.h"
  35 #include "wx/sizer.h"
  36
  37 #include "wx/gtk/private.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,
  76                                                   SCROLLBAR_CBACK_ARG
  77                                                   wxScrolledWindow *win )
  78 {
  79     if (g_isIdle)
  80         wxapp_install_idle_handler();
  81
  82     if (g_blockEventsOnDrag) return;
  83
  84     if (!win->m_hasVMT) return;
  85
  86     win->GtkVScroll( adjust->value,
  87             GET_SCROLL_TYPE(GTK_SCROLLED_WINDOW(win->m_widget)->vscrollbar) );
  88 }
  89
  90 //-----------------------------------------------------------------------------
  91 // "value_changed" from m_hAdjust
  92 //-----------------------------------------------------------------------------
  93
  94 static void gtk_scrolled_window_hscroll_callback( GtkAdjustment *adjust,
  95                                                   SCROLLBAR_CBACK_ARG
  96                                                   wxScrolledWindow *win )
  97 {
  98     if (g_isIdle)
  99         wxapp_install_idle_handler();
 100
 101     if (g_blockEventsOnDrag) return;
 102     if (!win->m_hasVMT) return;
 103
 104     win->GtkHScroll( adjust->value,
 105             GET_SCROLL_TYPE(GTK_SCROLLED_WINDOW(win->m_widget)->hscrollbar) );
 106 }
 107
 108 //-----------------------------------------------------------------------------
 109 // "button_press_event" from scrollbar
 110 //-----------------------------------------------------------------------------
 111
 112 static gint gtk_scrollbar_button_press_callback( GtkRange *widget,
 113                                                  GdkEventButton *gdk_event,
 114                                                  wxWindowGTK *win)
 115 {
 116     if (g_isIdle)
 117         wxapp_install_idle_handler();
 118
 119     g_blockEventsOnScroll = TRUE;
 120
 121     // FIXME: there is no slider field any more, what was meant here?
 122 #ifndef __WXGTK20__
 123     win->m_isScrolling = (gdk_event->window == widget->slider);
 124 #endif
 125
 126     return FALSE;
 127 }
 128
 129 //-----------------------------------------------------------------------------
 130 // "button_release_event" from scrollbar
 131 //-----------------------------------------------------------------------------
 132
 133 static gint gtk_scrollbar_button_release_callback( GtkRange *widget,
 134                                                    GdkEventButton *WXUNUSED(gdk_event),
 135                                                    wxWindowGTK *win)
 136 {
 137 //  don't test here as we can release the mouse while being over
 138 //  a different window than the slider
 139 //
 140 //    if (gdk_event->window != widget->slider) return FALSE;
 141
 142     g_blockEventsOnScroll = FALSE;
 143
 144     if (win->m_isScrolling)
 145     {
 146         wxEventType command = wxEVT_SCROLLWIN_THUMBRELEASE;
 147         int value = -1;
 148         int dir = -1;
 149
 150         GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(win->m_widget);
 151         if (widget == GTK_RANGE(scrolledWindow->hscrollbar))
 152         {
 153             value = (int)(win->m_hAdjust->value+0.5);
 154             dir = wxHORIZONTAL;
 155         }
 156         if (widget == GTK_RANGE(scrolledWindow->vscrollbar))
 157         {
 158             value = (int)(win->m_vAdjust->value+0.5);
 159             dir = wxVERTICAL;
 160         }
 161
 162         wxScrollWinEvent event( command, value, dir );
 163         event.SetEventObject( win );
 164         win->GetEventHandler()->ProcessEvent( event );
 165     }
 166
 167     win->m_isScrolling = FALSE;
 168
 169     return FALSE;
 170 }
 171
 172 //-----------------------------------------------------------------------------
 173 // InsertChild for wxScrolledWindow
 174 //-----------------------------------------------------------------------------
 175
 176 static void wxInsertChildInScrolledWindow( wxWindow* parent, wxWindow* child )
 177 {
 178     // The window might have been scrolled already, do we
 179     // have to adapt the position.
 180     GtkPizza *pizza = GTK_PIZZA(parent->m_wxwindow);
 181     child->m_x += pizza->xoffset;
 182     child->m_y += pizza->yoffset;
 183
 184     gtk_pizza_put( GTK_PIZZA(parent->m_wxwindow),
 185                      GTK_WIDGET(child->m_widget),
 186                      child->m_x,
 187                      child->m_y,
 188                      child->m_width,
 189                      child->m_height );
 190 }
 191
 192 // ----------------------------------------------------------------------------
 193 // wxScrolledWindow creation
 194 // ----------------------------------------------------------------------------
 195
 196 void wxScrolledWindow::Init()
 197 {
 198     m_xScrollPixelsPerLine = 0;
 199     m_yScrollPixelsPerLine = 0;
 200     m_xScrollingEnabled = TRUE;
 201     m_yScrollingEnabled = TRUE;
 202     m_xScrollPosition = 0;
 203     m_yScrollPosition = 0;
 204     m_xScrollLinesPerPage = 0;
 205     m_yScrollLinesPerPage = 0;
 206     m_targetWindow = (wxWindow*) NULL;
 207     m_scaleX = 1.0;
 208     m_scaleY = 1.0;
 209     m_hasScrolling = TRUE;
 210 }
 211
 212 bool wxScrolledWindow::Create(wxWindow *parent,
 213                               wxWindowID id,
 214                               const wxPoint& pos,
 215                               const wxSize& size,
 216                               long style,
 217                               const wxString& name)
 218 {
 219     Init();
 220
 221     if (!PreCreation( parent, pos, size ) ||
 222         !CreateBase( parent, id, pos, size, style, wxDefaultValidator, name ))
 223     {
 224         wxFAIL_MSG( wxT("wxWindow creation failed") );
 225         return FALSE;
 226     }
 227
 228     m_insertCallback = wxInsertChildInScrolledWindow;
 229
 230     m_targetWindow = this;
 231
 232     m_widget = gtk_scrolled_window_new( (GtkAdjustment *) NULL, (GtkAdjustment *) NULL );
 233     GTK_WIDGET_UNSET_FLAGS( m_widget, GTK_CAN_FOCUS );
 234
 235     GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(m_widget);
 236
 237     GtkScrolledWindowClass *scroll_class = GTK_SCROLLED_WINDOW_CLASS( GTK_OBJECT_GET_CLASS(m_widget) );
 238     scroll_class->scrollbar_spacing = 0;
 239
 240     gtk_scrolled_window_set_policy( scrolledWindow, GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC );
 241
 242     m_hAdjust = gtk_range_get_adjustment( GTK_RANGE(scrolledWindow->hscrollbar) );
 243     m_vAdjust = gtk_range_get_adjustment( GTK_RANGE(scrolledWindow->vscrollbar) );
 244
 245     m_wxwindow = gtk_pizza_new();
 246
 247     gtk_container_add( GTK_CONTAINER(m_widget), m_wxwindow );
 248
 249     GtkPizza *pizza = GTK_PIZZA(m_wxwindow);
 250
 251     if (HasFlag(wxRAISED_BORDER))
 252     {
 253         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_OUT );
 254     }
 255     else if (HasFlag(wxSUNKEN_BORDER))
 256     {
 257         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_IN );
 258     }
 259     else if (HasFlag(wxSIMPLE_BORDER))
 260     {
 261         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_THIN );
 262     }
 263     else
 264     {
 265         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_NONE );
 266     }
 267
 268     GTK_WIDGET_SET_FLAGS( m_wxwindow, GTK_CAN_FOCUS );
 269     m_acceptsFocus = TRUE;
 270
 271     // I _really_ don't want scrollbars in the beginning
 272     m_vAdjust->lower = 0.0;
 273     m_vAdjust->upper = 1.0;
 274     m_vAdjust->value = 0.0;
 275     m_vAdjust->step_increment = 1.0;
 276     m_vAdjust->page_increment = 2.0;
 277     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 278     m_hAdjust->lower = 0.0;
 279     m_hAdjust->upper = 1.0;
 280     m_hAdjust->value = 0.0;
 281     m_hAdjust->step_increment = 1.0;
 282     m_hAdjust->page_increment = 2.0;
 283     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 284
 285     // Handlers for new scrollbar values
 286     GtkVConnectEvent();
 287     GtkHConnectEvent();
 288
 289     // these handlers block mouse events to any window during scrolling such as
 290     // motion events and prevent GTK and wxWidgets from fighting over where the
 291     // slider should be
 292
 293     gtk_signal_connect( GTK_OBJECT(scrolledWindow->vscrollbar), "button_press_event",
 294           (GtkSignalFunc)gtk_scrollbar_button_press_callback, (gpointer) this );
 295
 296     gtk_signal_connect( GTK_OBJECT(scrolledWindow->hscrollbar), "button_press_event",
 297           (GtkSignalFunc)gtk_scrollbar_button_press_callback, (gpointer) this );
 298
 299     gtk_signal_connect( GTK_OBJECT(scrolledWindow->vscrollbar), "button_release_event",
 300           (GtkSignalFunc)gtk_scrollbar_button_release_callback, (gpointer) this );
 301
 302     gtk_signal_connect( GTK_OBJECT(scrolledWindow->hscrollbar), "button_release_event",
 303           (GtkSignalFunc)gtk_scrollbar_button_release_callback, (gpointer) this );
 304
 305     gtk_widget_show( m_wxwindow );
 306
 307     if (m_parent)
 308         m_parent->DoAddChild( this );
 309
 310     m_focusWidget = m_wxwindow;
 311
 312     PostCreation();
 313
 314     Show( TRUE );
 315
 316     return TRUE;
 317 }
 318
 319 // ----------------------------------------------------------------------------
 320 // setting scrolling parameters
 321 // ----------------------------------------------------------------------------
 322
 323 void wxScrolledWindow::DoSetVirtualSize( int x, int y )
 324 {
 325     wxPanel::DoSetVirtualSize( x, y );
 326     AdjustScrollbars();
 327
 328     if (GetAutoLayout())
 329         Layout();
 330 }
 331
 332 /*
 333  * pixelsPerUnitX/pixelsPerUnitY: number of pixels per unit (e.g. pixels per text line)
 334  * noUnitsX/noUnitsY:        : no. units per scrollbar
 335  */
 336 void wxScrolledWindow::SetScrollbars( int pixelsPerUnitX, int pixelsPerUnitY,
 337                                       int noUnitsX, int noUnitsY,
 338                                       int xPos, int yPos, bool noRefresh )
 339 {
 340     int xs, ys;
 341     GetViewStart (& xs, & ys);
 342
 343     int old_x = m_xScrollPixelsPerLine * xs;
 344     int old_y = m_yScrollPixelsPerLine * ys;
 345
 346     m_xScrollPixelsPerLine = pixelsPerUnitX;
 347     m_yScrollPixelsPerLine = pixelsPerUnitY;
 348
 349     m_hAdjust->value = m_xScrollPosition = xPos;
 350     m_vAdjust->value = m_yScrollPosition = yPos;
 351
 352     // Setting hints here should arguably be deprecated, but without it
 353     // a sizer might override this manual scrollbar setting in old code.
 354     m_targetWindow->SetVirtualSizeHints( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY );
 355
 356     m_targetWindow->SetVirtualSize( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY );
 357
 358     if (!noRefresh)
 359     {
 360         int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 361         int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 362
 363         m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
 364     }
 365 }
 366
 367 void wxScrolledWindow::AdjustScrollbars()
 368 {
 369     int w, h;
 370     int vw, vh;
 371
 372     m_targetWindow->GetClientSize( &w, &h );
 373     m_targetWindow->GetVirtualSize( &vw, &vh );
 374
 375     if (m_xScrollPixelsPerLine == 0)
 376     {
 377         m_hAdjust->upper = 1.0;
 378         m_hAdjust->page_increment = 1.0;
 379         m_hAdjust->page_size = 1.0;
 380     }
 381     else
 382     {
 383         m_hAdjust->upper = vw / m_xScrollPixelsPerLine;
 384         m_hAdjust->page_increment = (w / m_xScrollPixelsPerLine);
 385         m_hAdjust->page_size = m_hAdjust->page_increment;
 386
 387         // If the scrollbar hits the right side, move the window
 388         // right to keep it from over extending.
 389
 390         if ((m_hAdjust->value != 0.0) && (m_hAdjust->value + m_hAdjust->page_size > m_hAdjust->upper))
 391         {
 392             m_hAdjust->value = m_hAdjust->upper - m_hAdjust->page_size;
 393             if (m_hAdjust->value < 0.0)
 394                 m_hAdjust->value = 0.0;
 395
 396             if (GetChildren().GetCount() == 0)
 397                 m_xScrollPosition = (int)m_hAdjust->value; // This is enough without child windows
 398             else
 399                 gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" ); // Actually scroll window
 400         }
 401     }
 402
 403     if (m_yScrollPixelsPerLine == 0)
 404     {
 405         m_vAdjust->upper = 1.0;
 406         m_vAdjust->page_increment = 1.0;
 407         m_vAdjust->page_size = 1.0;
 408     }
 409     else
 410     {
 411         m_vAdjust->upper = vh / m_yScrollPixelsPerLine;
 412         m_vAdjust->page_increment = (h / m_yScrollPixelsPerLine);
 413         m_vAdjust->page_size = m_vAdjust->page_increment;
 414
 415         if ((m_vAdjust->value != 0.0) && (m_vAdjust->value + m_vAdjust->page_size > m_vAdjust->upper))
 416         {
 417             m_vAdjust->value = m_vAdjust->upper - m_vAdjust->page_size;
 418             if (m_vAdjust->value < 0.0)
 419                 m_vAdjust->value = 0.0;
 420
 421             if (GetChildren().GetCount() == 0)
 422                 m_yScrollPosition = (int)m_vAdjust->value;
 423             else
 424                 gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 425         }
 426     }
 427
 428     m_xScrollLinesPerPage = (int)(m_hAdjust->page_increment + 0.5);
 429     m_yScrollLinesPerPage = (int)(m_vAdjust->page_increment + 0.5);
 430
 431     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 432     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 433 }
 434
 435
 436 // ----------------------------------------------------------------------------
 437 // target window handling
 438 // ----------------------------------------------------------------------------
 439
 440 void wxScrolledWindow::SetTargetWindow( wxWindow *target, bool WXUNUSED(pushEventHandler) )
 441 {
 442     wxASSERT_MSG( target, wxT("target window must not be NULL") );
 443     m_targetWindow = target;
 444 }
 445
 446 wxWindow *wxScrolledWindow::GetTargetWindow() const
 447 {
 448     return m_targetWindow;
 449 }
 450
 451 // Override this function if you don't want to have wxScrolledWindow
 452 // automatically change the origin according to the scroll position.
 453 void wxScrolledWindow::DoPrepareDC(wxDC& dc)
 454 {
 455     dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,
 456                         -m_yScrollPosition * m_yScrollPixelsPerLine );
 457 }
 458
 459 void wxScrolledWindow::SetScrollRate( int xstep, int ystep )
 460 {
 461     int old_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 462     int old_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 463
 464     m_xScrollPixelsPerLine = xstep;
 465     m_yScrollPixelsPerLine = ystep;
 466
 467     int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 468     int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 469
 470     m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
 471
 472     AdjustScrollbars();
 473 }
 474
 475 void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 476 {
 477     if ( x_unit )
 478         *x_unit = m_xScrollPixelsPerLine;
 479     if ( y_unit )
 480         *y_unit = m_yScrollPixelsPerLine;
 481 }
 482
 483 int wxScrolledWindow::GetScrollPageSize(int orient) const
 484 {
 485     if ( orient == wxHORIZONTAL )
 486         return m_xScrollLinesPerPage;
 487     else
 488         return m_yScrollLinesPerPage;
 489 }
 490
 491 void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
 492 {
 493     if ( orient == wxHORIZONTAL )
 494         m_xScrollLinesPerPage = pageSize;
 495     else
 496         m_yScrollLinesPerPage = pageSize;
 497 }
 498
 499 void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)
 500 {
 501     int orient = event.GetOrientation();
 502
 503     int nScrollInc = CalcScrollInc(event);
 504     if (nScrollInc == 0) return;
 505
 506     if (orient == wxHORIZONTAL)
 507     {
 508         int newPos = m_xScrollPosition + nScrollInc;
 509         SetScrollPos(wxHORIZONTAL, newPos, TRUE );
 510     }
 511     else
 512     {
 513         int newPos = m_yScrollPosition + nScrollInc;
 514         SetScrollPos(wxVERTICAL, newPos, TRUE );
 515     }
 516
 517     if (orient == wxHORIZONTAL)
 518     {
 519         m_xScrollPosition += nScrollInc;
 520     }
 521     else
 522     {
 523         m_yScrollPosition += nScrollInc;
 524     }
 525
 526     if (orient == wxHORIZONTAL)
 527     {
 528        if (m_xScrollingEnabled)
 529             m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
 530        else
 531             m_targetWindow->Refresh();
 532     }
 533     else
 534     {
 535         if (m_yScrollingEnabled)
 536             m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
 537         else
 538             m_targetWindow->Refresh();
 539     }
 540 }
 541
 542 void wxScrolledWindow::Scroll( int x_pos, int y_pos )
 543 {
 544     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 545
 546     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
 547         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
 548
 549     if ((x_pos != -1) && (m_xScrollPixelsPerLine))
 550     {
 551         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 552         if (max < 0) max = 0;
 553         if (x_pos > max) x_pos = max;
 554         if (x_pos < 0) x_pos = 0;
 555
 556         int old_x = m_xScrollPosition;
 557         m_xScrollPosition = x_pos;
 558         m_hAdjust->value = x_pos;
 559
 560         m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
 561
 562         // Just update the scrollbar, don't send any wxWidgets event
 563         GtkHDisconnectEvent();
 564         gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 565         GtkHConnectEvent();
 566     }
 567
 568     if ((y_pos != -1) && (m_yScrollPixelsPerLine))
 569     {
 570         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 571         if (max < 0) max = 0;
 572         if (y_pos > max) y_pos = max;
 573         if (y_pos < 0) y_pos = 0;
 574
 575         int old_y = m_yScrollPosition;
 576         m_yScrollPosition = y_pos;
 577         m_vAdjust->value = y_pos;
 578
 579         m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
 580
 581         // Just update the scrollbar, don't send any wxWidgets event
 582         GtkVDisconnectEvent();
 583         gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 584         GtkVConnectEvent();
 585     }
 586 }
 587
 588 // TODO: [VH]Scroll functions should be combined
 589
 590 void wxScrolledWindow::GtkVScroll( float value, unsigned int scroll_type )
 591 {
 592     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 593
 594     if (m_yScrollPixelsPerLine == 0)
 595         return;
 596
 597     int y_pos = (int)(value+0.5);
 598
 599     if (y_pos == m_yScrollPosition)
 600         return;
 601
 602     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 603
 604     wxScrollWinEvent event( command, y_pos, wxVERTICAL );
 605     event.SetEventObject( this );
 606     GetEventHandler()->ProcessEvent( event );
 607 }
 608
 609 void wxScrolledWindow::GtkHScroll( float value, unsigned int scroll_type )
 610 {
 611     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 612
 613     if (m_xScrollPixelsPerLine == 0)
 614         return;
 615
 616     int x_pos = (int)(value+0.5);
 617
 618     if (x_pos == m_xScrollPosition)
 619         return;
 620
 621     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 622
 623     wxScrollWinEvent event( command, x_pos, wxHORIZONTAL );
 624     event.SetEventObject( this );
 625     GetEventHandler()->ProcessEvent( event );
 626 }
 627
 628 void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
 629 {
 630     m_xScrollingEnabled = x_scroll;
 631     m_yScrollingEnabled = y_scroll;
 632 }
 633
 634 // Where the current view starts from
 635 void wxScrolledWindow::GetViewStart (int *x, int *y) const
 636 {
 637     if ( x )
 638         *x = m_xScrollPosition;
 639     if ( y )
 640         *y = m_yScrollPosition;
 641 }
 642
 643 void wxScrolledWindow::DoCalcScrolledPosition(int x, int y, int *xx, int *yy) const
 644 {
 645     int xs, ys;
 646     GetViewStart (& xs, & ys);
 647
 648     if ( xx )
 649         *xx = x - xs * m_xScrollPixelsPerLine;
 650     if ( yy )
 651         *yy = y - ys * m_yScrollPixelsPerLine;
 652 }
 653
 654 void wxScrolledWindow::DoCalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
 655 {
 656     int xs, ys;
 657     GetViewStart (& xs, & ys);
 658
 659     if ( xx )
 660         *xx = x + xs * m_xScrollPixelsPerLine;
 661     if ( yy )
 662         *yy = y + ys * m_yScrollPixelsPerLine;
 663 }
 664
 665 int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
 666 {
 667     int pos = event.GetPosition();
 668     int orient = event.GetOrientation();
 669
 670     int nScrollInc = 0;
 671     if (event.GetEventType() == wxEVT_SCROLLWIN_TOP)
 672     {
 673             if (orient == wxHORIZONTAL)
 674                 nScrollInc = - m_xScrollPosition;
 675             else
 676                 nScrollInc = - m_yScrollPosition;
 677     } else
 678     if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
 679     {
 680             if (orient == wxHORIZONTAL)
 681                 nScrollInc = GetVirtualSize().GetWidth() / m_xScrollPixelsPerLine - m_xScrollPosition;
 682             else
 683                 nScrollInc = GetVirtualSize().GetHeight() / m_yScrollPixelsPerLine - m_yScrollPosition;
 684     } else
 685     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
 686     {
 687             nScrollInc = -1;
 688     } else
 689     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN)
 690     {
 691             nScrollInc = 1;
 692     } else
 693     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEUP)
 694     {
 695             if (orient == wxHORIZONTAL)
 696                 nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
 697             else
 698                 nScrollInc = -GetScrollPageSize(wxVERTICAL);
 699     } else
 700     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEDOWN)
 701     {
 702             if (orient == wxHORIZONTAL)
 703                 nScrollInc = GetScrollPageSize(wxHORIZONTAL);
 704             else
 705                 nScrollInc = GetScrollPageSize(wxVERTICAL);
 706     } else
 707     if ((event.GetEventType() == wxEVT_SCROLLWIN_THUMBTRACK) ||
 708         (event.GetEventType() == wxEVT_SCROLLWIN_THUMBRELEASE))
 709     {
 710             if (orient == wxHORIZONTAL)
 711                 nScrollInc = pos - m_xScrollPosition;
 712             else
 713                 nScrollInc = pos - m_yScrollPosition;
 714     }
 715
 716     if (orient == wxHORIZONTAL)
 717     {
 718         if (m_xScrollPixelsPerLine > 0)
 719         {
 720             int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 721             if (max < 0) max = 0;
 722
 723             if ( (m_xScrollPosition + nScrollInc) < 0 )
 724                 nScrollInc = -m_xScrollPosition; // As -ve as we can go
 725             else if ( (m_xScrollPosition + nScrollInc) > max )
 726                 nScrollInc = max - m_xScrollPosition; // As +ve as we can go
 727         }
 728         else
 729             m_targetWindow->Refresh();
 730     }
 731     else
 732     {
 733         if (m_yScrollPixelsPerLine > 0)
 734         {
 735             int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 736             if (max < 0) max = 0;
 737
 738             if ( (m_yScrollPosition + nScrollInc) < 0 )
 739                 nScrollInc = -m_yScrollPosition; // As -ve as we can go
 740             else if ( (m_yScrollPosition + nScrollInc) > max )
 741                 nScrollInc = max - m_yScrollPosition; // As +ve as we can go
 742         }
 743         else
 744             m_targetWindow->Refresh();
 745     }
 746
 747     return nScrollInc;
 748 }
 749
 750 void wxScrolledWindow::SetScrollPos( int orient, int pos, bool refresh )
 751 {
 752     wxCHECK_RET( m_widget != NULL, wxT("invalid window") );
 753
 754     wxCHECK_RET( m_wxwindow != NULL, wxT("window needs client area for scrolling") );
 755
 756     if (orient == wxHORIZONTAL)
 757     {
 758         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 759         if (max < 0) max = 0;
 760
 761         if (pos > max) pos = 0;
 762         if (pos < 0) pos = 0;
 763
 764         if (pos == (int)(m_hAdjust->value+0.5)) return;
 765         m_hAdjust->value = pos;
 766     }
 767     else
 768     {
 769         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 770         if (max < 0) max = 0;
 771
 772         if (pos > max) pos = 0;
 773         if (pos < 0) pos = 0;
 774
 775         if (pos == (int)(m_vAdjust->value+0.5)) return;
 776         m_vAdjust->value = pos;
 777     }
 778
 779     if (m_wxwindow->window)
 780     {
 781         if (orient == wxHORIZONTAL)
 782         {
 783             // Just update the scrollbar, don't send any wxWidgets event
 784             GtkHDisconnectEvent();
 785             gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 786             GtkHConnectEvent();
 787         }
 788         else
 789         {
 790             // Just update the scrollbar, don't send any wxWidgets event
 791             GtkVDisconnectEvent();
 792             gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 793             GtkVConnectEvent();
 794         }
 795     }
 796 }
 797
 798 void wxScrolledWindow::GtkVConnectEvent()
 799 {
 800     gtk_signal_connect( GTK_OBJECT(m_vAdjust), "value_changed",
 801           (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 802 }
 803
 804 void wxScrolledWindow::GtkHConnectEvent()
 805 {
 806     gtk_signal_connect( GTK_OBJECT(m_hAdjust), "value_changed",
 807           (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 808 }
 809
 810 void wxScrolledWindow::GtkHDisconnectEvent()
 811 {
 812     gtk_signal_disconnect_by_func( GTK_OBJECT(m_hAdjust),
 813         (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 814 }
 815
 816 void wxScrolledWindow::GtkVDisconnectEvent()
 817 {
 818     gtk_signal_disconnect_by_func( GTK_OBJECT(m_vAdjust),
 819         (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 820 }
 821
 822 bool wxScrolledWindow::Layout()
 823 {
 824     if (GetSizer() && m_targetWindow == this)
 825     {
 826         // If we're the scroll target, take into account the
 827         // virtual size and scrolled position of the window.
 828
 829         int x, y, w, h;
 830         CalcScrolledPosition(0,0, &x,&y);
 831         GetVirtualSize(&w, &h);
 832         GetSizer()->SetDimension(x, y, w, h);
 833         return TRUE;
 834     }
 835     else
 836         return wxPanel::Layout();  // fall back to default for LayoutConstraints
 837 }
 838
 839 // ----------------------------------------------------------------------------
 840 // event handlers
 841 // ----------------------------------------------------------------------------
 842
 843 // Default OnSize resets scrollbars, if any
 844 void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 845 {
 846     if( GetAutoLayout() || m_targetWindow->GetAutoLayout() )
 847     {
 848         if( m_targetWindow != this )
 849             m_targetWindow->FitInside();
 850
 851         FitInside();
 852
 853         // FIXME:  Something is really weird here...  This should be
 854         // called by FitInside above (and apparently is), yet the
 855         // scrollsub sample will get the scrollbar wrong if resized
 856         // quickly.  This masks the bug, but is surely not the right
 857         // answer at all.
 858         AdjustScrollbars();
 859     }
 860     else
 861     {
 862         AdjustScrollbars();
 863     }
 864 }
 865
 866 // This calls OnDraw, having adjusted the origin according to the current
 867 // scroll position
 868 void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 869 {
 870     wxPaintDC dc(this);
 871     PrepareDC(dc);
 872
 873     OnDraw(dc);
 874 }
 875
 876 // kbd handling: notice that we use OnChar() and not OnKeyDown() for
 877 // compatibility here - if we used OnKeyDown(), the programs which process
 878 // arrows themselves in their OnChar() would never get the message and like
 879 // this they always have the priority
 880 void wxScrolledWindow::OnChar(wxKeyEvent& event)
 881 {
 882     int stx, sty,       // view origin
 883         szx, szy,       // view size (total)
 884         clix, cliy;     // view size (on screen)
 885
 886     GetViewStart(&stx, &sty);
 887     GetClientSize(&clix, &cliy);
 888     GetVirtualSize(&szx, &szy);
 889
 890     if( m_xScrollPixelsPerLine )
 891     {
 892         clix /= m_xScrollPixelsPerLine;
 893         szx /= m_xScrollPixelsPerLine;
 894     }
 895     else
 896     {
 897         clix = 0;
 898         szx = -1;
 899     }
 900     if( m_yScrollPixelsPerLine )
 901     {
 902         cliy /= m_yScrollPixelsPerLine;
 903         szy /= m_yScrollPixelsPerLine;
 904     }
 905     else
 906     {
 907         cliy = 0;
 908         szy = -1;
 909     }
 910
 911     int xScrollOld = GetScrollPos(wxHORIZONTAL),
 912         yScrollOld = GetScrollPos(wxVERTICAL);
 913
 914     int dsty;
 915     switch ( event.GetKeyCode() )
 916     {
 917         case WXK_PAGEUP:
 918         case WXK_PRIOR:
 919             dsty = sty - (5 * cliy / 6);
 920             Scroll(-1, (dsty == -1) ? 0 : dsty);
 921             break;
 922
 923         case WXK_PAGEDOWN:
 924         case WXK_NEXT:
 925             Scroll(-1, sty + (5 * cliy / 6));
 926             break;
 927
 928         case WXK_HOME:
 929             Scroll(0, event.ControlDown() ? 0 : -1);
 930             break;
 931
 932         case WXK_END:
 933             Scroll(szx - clix, event.ControlDown() ? szy - cliy : -1);
 934             break;
 935
 936         case WXK_UP:
 937             Scroll(-1, sty - 1);
 938             break;
 939
 940         case WXK_DOWN:
 941             Scroll(-1, sty + 1);
 942             break;
 943
 944         case WXK_LEFT:
 945             Scroll(stx - 1, -1);
 946             break;
 947
 948         case WXK_RIGHT:
 949             Scroll(stx + 1, -1);
 950             break;
 951
 952         default:
 953             // not for us
 954             event.Skip();
 955             return;
 956     }
 957
 958     int xScroll = GetScrollPos(wxHORIZONTAL);
 959     if ( xScroll != xScrollOld )
 960     {
 961         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, xScroll,
 962                                wxHORIZONTAL);
 963         event.SetEventObject(this);
 964         GetEventHandler()->ProcessEvent(event);
 965     }
 966
 967     int yScroll = GetScrollPos(wxVERTICAL);
 968     if ( yScroll != yScrollOld )
 969     {
 970         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, yScroll,
 971                                wxVERTICAL);
 972         event.SetEventObject(this);
 973         GetEventHandler()->ProcessEvent(event);
 974     }
 975 }
 976
 977
 978 // vi:sts=4:sw=4:et