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-1) / m_xScrollPixelsPerLine;
 384         m_hAdjust->page_size = w / m_xScrollPixelsPerLine;
 385         m_hAdjust->page_increment = w / m_xScrollPixelsPerLine;
 386
 387         // Special case. When client and virtual size are very close but
 388         // the client is big enough, kill scrollbar.
 389
 390         if ((m_hAdjust->page_size < m_hAdjust->upper) && (w >= vw))
 391             m_hAdjust->page_size += 1.0;
 392
 393         // If the scrollbar hits the right side, move the window
 394         // right to keep it from over extending.
 395
 396         if ((m_hAdjust->value != 0.0) && (m_hAdjust->value + m_hAdjust->page_size > m_hAdjust->upper))
 397         {
 398             m_hAdjust->value = m_hAdjust->upper - m_hAdjust->page_size;
 399             if (m_hAdjust->value < 0.0)
 400                 m_hAdjust->value = 0.0;
 401
 402             if (GetChildren().GetCount() == 0)
 403                 m_xScrollPosition = (int)m_hAdjust->value; // This is enough without child windows
 404             else
 405                 gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" ); // Actually scroll window
 406         }
 407     }
 408
 409     if (m_yScrollPixelsPerLine == 0)
 410     {
 411         m_vAdjust->upper = 1.0;
 412         m_vAdjust->page_increment = 1.0;
 413         m_vAdjust->page_size = 1.0;
 414     }
 415     else
 416     {
 417         m_vAdjust->upper = (vh+m_yScrollPixelsPerLine-1) / m_yScrollPixelsPerLine;
 418         m_vAdjust->page_size = h / m_yScrollPixelsPerLine;
 419         m_vAdjust->page_increment = h / m_yScrollPixelsPerLine;
 420
 421         if ((m_vAdjust->page_size < m_vAdjust->upper) && (h >= vh))
 422             m_vAdjust->page_size += 1.0;
 423
 424         if ((m_vAdjust->value != 0.0) && (m_vAdjust->value + m_vAdjust->page_size > m_vAdjust->upper))
 425         {
 426             m_vAdjust->value = m_vAdjust->upper - m_vAdjust->page_size;
 427             if (m_vAdjust->value < 0.0)
 428                 m_vAdjust->value = 0.0;
 429
 430             if (GetChildren().GetCount() == 0)
 431                 m_yScrollPosition = (int)m_vAdjust->value;
 432             else
 433                 gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 434         }
 435     }
 436
 437     m_xScrollLinesPerPage = (int)(m_hAdjust->page_increment + 0.5);
 438     m_yScrollLinesPerPage = (int)(m_vAdjust->page_increment + 0.5);
 439
 440     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 441     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 442 }
 443
 444
 445 // ----------------------------------------------------------------------------
 446 // target window handling
 447 // ----------------------------------------------------------------------------
 448
 449 void wxScrolledWindow::SetTargetWindow( wxWindow *target, bool WXUNUSED(pushEventHandler) )
 450 {
 451     wxASSERT_MSG( target, wxT("target window must not be NULL") );
 452     m_targetWindow = target;
 453 }
 454
 455 wxWindow *wxScrolledWindow::GetTargetWindow() const
 456 {
 457     return m_targetWindow;
 458 }
 459
 460 // Override this function if you don't want to have wxScrolledWindow
 461 // automatically change the origin according to the scroll position.
 462 void wxScrolledWindow::DoPrepareDC(wxDC& dc)
 463 {
 464     dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,
 465                         -m_yScrollPosition * m_yScrollPixelsPerLine );
 466 }
 467
 468 void wxScrolledWindow::SetScrollRate( int xstep, int ystep )
 469 {
 470     int old_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 471     int old_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 472
 473     m_xScrollPixelsPerLine = xstep;
 474     m_yScrollPixelsPerLine = ystep;
 475
 476     int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 477     int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 478
 479     m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
 480
 481     AdjustScrollbars();
 482 }
 483
 484 void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 485 {
 486     if ( x_unit )
 487         *x_unit = m_xScrollPixelsPerLine;
 488     if ( y_unit )
 489         *y_unit = m_yScrollPixelsPerLine;
 490 }
 491
 492 int wxScrolledWindow::GetScrollPageSize(int orient) const
 493 {
 494     if ( orient == wxHORIZONTAL )
 495         return m_xScrollLinesPerPage;
 496     else
 497         return m_yScrollLinesPerPage;
 498 }
 499
 500 void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
 501 {
 502     if ( orient == wxHORIZONTAL )
 503         m_xScrollLinesPerPage = pageSize;
 504     else
 505         m_yScrollLinesPerPage = pageSize;
 506 }
 507
 508 void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)
 509 {
 510     int orient = event.GetOrientation();
 511
 512     int nScrollInc = CalcScrollInc(event);
 513     if (nScrollInc == 0) return;
 514
 515     if (orient == wxHORIZONTAL)
 516     {
 517         int newPos = m_xScrollPosition + nScrollInc;
 518         SetScrollPos(wxHORIZONTAL, newPos, TRUE );
 519     }
 520     else
 521     {
 522         int newPos = m_yScrollPosition + nScrollInc;
 523         SetScrollPos(wxVERTICAL, newPos, TRUE );
 524     }
 525
 526     if (orient == wxHORIZONTAL)
 527     {
 528         m_xScrollPosition += nScrollInc;
 529     }
 530     else
 531     {
 532         m_yScrollPosition += nScrollInc;
 533     }
 534
 535     if (orient == wxHORIZONTAL)
 536     {
 537        if (m_xScrollingEnabled)
 538             m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
 539        else
 540             m_targetWindow->Refresh();
 541     }
 542     else
 543     {
 544         if (m_yScrollingEnabled)
 545             m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
 546         else
 547             m_targetWindow->Refresh();
 548     }
 549 }
 550
 551 void wxScrolledWindow::Scroll( int x_pos, int y_pos )
 552 {
 553     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 554
 555     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
 556         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
 557
 558     if ((x_pos != -1) && (m_xScrollPixelsPerLine))
 559     {
 560         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 561         if (max < 0) max = 0;
 562         if (x_pos > max) x_pos = max;
 563         if (x_pos < 0) x_pos = 0;
 564
 565         int old_x = m_xScrollPosition;
 566         m_xScrollPosition = x_pos;
 567         m_hAdjust->value = x_pos;
 568
 569         m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
 570
 571         // Just update the scrollbar, don't send any wxWidgets event
 572         GtkHDisconnectEvent();
 573         gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 574         GtkHConnectEvent();
 575     }
 576
 577     if ((y_pos != -1) && (m_yScrollPixelsPerLine))
 578     {
 579         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 580         if (max < 0) max = 0;
 581         if (y_pos > max) y_pos = max;
 582         if (y_pos < 0) y_pos = 0;
 583
 584         int old_y = m_yScrollPosition;
 585         m_yScrollPosition = y_pos;
 586         m_vAdjust->value = y_pos;
 587
 588         m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
 589
 590         // Just update the scrollbar, don't send any wxWidgets event
 591         GtkVDisconnectEvent();
 592         gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 593         GtkVConnectEvent();
 594     }
 595 }
 596
 597 // TODO: [VH]Scroll functions should be combined
 598
 599 void wxScrolledWindow::GtkVScroll( float value, unsigned int scroll_type )
 600 {
 601     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 602
 603     if (m_yScrollPixelsPerLine == 0)
 604         return;
 605
 606     int y_pos = (int)(value+0.5);
 607
 608     if (y_pos == m_yScrollPosition)
 609         return;
 610
 611     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 612
 613     wxScrollWinEvent event( command, y_pos, wxVERTICAL );
 614     event.SetEventObject( this );
 615     GetEventHandler()->ProcessEvent( event );
 616 }
 617
 618 void wxScrolledWindow::GtkHScroll( float value, unsigned int scroll_type )
 619 {
 620     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 621
 622     if (m_xScrollPixelsPerLine == 0)
 623         return;
 624
 625     int x_pos = (int)(value+0.5);
 626
 627     if (x_pos == m_xScrollPosition)
 628         return;
 629
 630     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 631
 632     wxScrollWinEvent event( command, x_pos, wxHORIZONTAL );
 633     event.SetEventObject( this );
 634     GetEventHandler()->ProcessEvent( event );
 635 }
 636
 637 void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
 638 {
 639     m_xScrollingEnabled = x_scroll;
 640     m_yScrollingEnabled = y_scroll;
 641 }
 642
 643 // Where the current view starts from
 644 void wxScrolledWindow::GetViewStart (int *x, int *y) const
 645 {
 646     if ( x )
 647         *x = m_xScrollPosition;
 648     if ( y )
 649         *y = m_yScrollPosition;
 650 }
 651
 652 void wxScrolledWindow::DoCalcScrolledPosition(int x, int y, int *xx, int *yy) const
 653 {
 654     int xs, ys;
 655     GetViewStart (& xs, & ys);
 656
 657     if ( xx )
 658         *xx = x - xs * m_xScrollPixelsPerLine;
 659     if ( yy )
 660         *yy = y - ys * m_yScrollPixelsPerLine;
 661 }
 662
 663 void wxScrolledWindow::DoCalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
 664 {
 665     int xs, ys;
 666     GetViewStart (& xs, & ys);
 667
 668     if ( xx )
 669         *xx = x + xs * m_xScrollPixelsPerLine;
 670     if ( yy )
 671         *yy = y + ys * m_yScrollPixelsPerLine;
 672 }
 673
 674 int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
 675 {
 676     int pos = event.GetPosition();
 677     int orient = event.GetOrientation();
 678
 679     int nScrollInc = 0;
 680     if (event.GetEventType() == wxEVT_SCROLLWIN_TOP)
 681     {
 682             if (orient == wxHORIZONTAL)
 683                 nScrollInc = - m_xScrollPosition;
 684             else
 685                 nScrollInc = - m_yScrollPosition;
 686     } else
 687     if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
 688     {
 689             if (orient == wxHORIZONTAL)
 690                 nScrollInc = GetVirtualSize().GetWidth() / m_xScrollPixelsPerLine - m_xScrollPosition;
 691             else
 692                 nScrollInc = GetVirtualSize().GetHeight() / m_yScrollPixelsPerLine - m_yScrollPosition;
 693     } else
 694     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
 695     {
 696             nScrollInc = -1;
 697     } else
 698     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN)
 699     {
 700             nScrollInc = 1;
 701     } else
 702     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEUP)
 703     {
 704             if (orient == wxHORIZONTAL)
 705                 nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
 706             else
 707                 nScrollInc = -GetScrollPageSize(wxVERTICAL);
 708     } else
 709     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEDOWN)
 710     {
 711             if (orient == wxHORIZONTAL)
 712                 nScrollInc = GetScrollPageSize(wxHORIZONTAL);
 713             else
 714                 nScrollInc = GetScrollPageSize(wxVERTICAL);
 715     } else
 716     if ((event.GetEventType() == wxEVT_SCROLLWIN_THUMBTRACK) ||
 717         (event.GetEventType() == wxEVT_SCROLLWIN_THUMBRELEASE))
 718     {
 719             if (orient == wxHORIZONTAL)
 720                 nScrollInc = pos - m_xScrollPosition;
 721             else
 722                 nScrollInc = pos - m_yScrollPosition;
 723     }
 724
 725     if (orient == wxHORIZONTAL)
 726     {
 727         if (m_xScrollPixelsPerLine > 0)
 728         {
 729             int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 730             if (max < 0) max = 0;
 731
 732             if ( (m_xScrollPosition + nScrollInc) < 0 )
 733                 nScrollInc = -m_xScrollPosition; // As -ve as we can go
 734             else if ( (m_xScrollPosition + nScrollInc) > max )
 735                 nScrollInc = max - m_xScrollPosition; // As +ve as we can go
 736         }
 737         else
 738             m_targetWindow->Refresh();
 739     }
 740     else
 741     {
 742         if (m_yScrollPixelsPerLine > 0)
 743         {
 744             int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 745             if (max < 0) max = 0;
 746
 747             if ( (m_yScrollPosition + nScrollInc) < 0 )
 748                 nScrollInc = -m_yScrollPosition; // As -ve as we can go
 749             else if ( (m_yScrollPosition + nScrollInc) > max )
 750                 nScrollInc = max - m_yScrollPosition; // As +ve as we can go
 751         }
 752         else
 753             m_targetWindow->Refresh();
 754     }
 755
 756     return nScrollInc;
 757 }
 758
 759 void wxScrolledWindow::SetScrollPos( int orient, int pos, bool refresh )
 760 {
 761     wxCHECK_RET( m_widget != NULL, wxT("invalid window") );
 762
 763     wxCHECK_RET( m_wxwindow != NULL, wxT("window needs client area for scrolling") );
 764
 765     if (orient == wxHORIZONTAL)
 766     {
 767         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 768         if (max < 0) max = 0;
 769
 770         if (pos > max) pos = 0;
 771         if (pos < 0) pos = 0;
 772
 773         if (pos == (int)(m_hAdjust->value+0.5)) return;
 774         m_hAdjust->value = pos;
 775     }
 776     else
 777     {
 778         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 779         if (max < 0) max = 0;
 780
 781         if (pos > max) pos = 0;
 782         if (pos < 0) pos = 0;
 783
 784         if (pos == (int)(m_vAdjust->value+0.5)) return;
 785         m_vAdjust->value = pos;
 786     }
 787
 788     if (m_wxwindow->window)
 789     {
 790         if (orient == wxHORIZONTAL)
 791         {
 792             // Just update the scrollbar, don't send any wxWidgets event
 793             GtkHDisconnectEvent();
 794             gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 795             GtkHConnectEvent();
 796         }
 797         else
 798         {
 799             // Just update the scrollbar, don't send any wxWidgets event
 800             GtkVDisconnectEvent();
 801             gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 802             GtkVConnectEvent();
 803         }
 804     }
 805 }
 806
 807 void wxScrolledWindow::GtkVConnectEvent()
 808 {
 809     gtk_signal_connect( GTK_OBJECT(m_vAdjust), "value_changed",
 810           (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 811 }
 812
 813 void wxScrolledWindow::GtkHConnectEvent()
 814 {
 815     gtk_signal_connect( GTK_OBJECT(m_hAdjust), "value_changed",
 816           (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 817 }
 818
 819 void wxScrolledWindow::GtkHDisconnectEvent()
 820 {
 821     gtk_signal_disconnect_by_func( GTK_OBJECT(m_hAdjust),
 822         (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 823 }
 824
 825 void wxScrolledWindow::GtkVDisconnectEvent()
 826 {
 827     gtk_signal_disconnect_by_func( GTK_OBJECT(m_vAdjust),
 828         (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 829 }
 830
 831 bool wxScrolledWindow::Layout()
 832 {
 833     if (GetSizer() && m_targetWindow == this)
 834     {
 835         // If we're the scroll target, take into account the
 836         // virtual size and scrolled position of the window.
 837
 838         int x, y, w, h;
 839         CalcScrolledPosition(0,0, &x,&y);
 840         GetVirtualSize(&w, &h);
 841         GetSizer()->SetDimension(x, y, w, h);
 842         return TRUE;
 843     }
 844     else
 845         return wxPanel::Layout();  // fall back to default for LayoutConstraints
 846 }
 847
 848 // ----------------------------------------------------------------------------
 849 // event handlers
 850 // ----------------------------------------------------------------------------
 851
 852 // Default OnSize resets scrollbars, if any
 853 void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 854 {
 855     if( GetAutoLayout() || m_targetWindow->GetAutoLayout() )
 856     {
 857         if( m_targetWindow != this )
 858             m_targetWindow->FitInside();
 859
 860         FitInside();
 861
 862         // FIXME:  Something is really weird here...  This should be
 863         // called by FitInside above (and apparently is), yet the
 864         // scrollsub sample will get the scrollbar wrong if resized
 865         // quickly.  This masks the bug, but is surely not the right
 866         // answer at all.
 867         AdjustScrollbars();
 868     }
 869     else
 870     {
 871         AdjustScrollbars();
 872     }
 873 }
 874
 875 // This calls OnDraw, having adjusted the origin according to the current
 876 // scroll position
 877 void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 878 {
 879     wxPaintDC dc(this);
 880     PrepareDC(dc);
 881
 882     OnDraw(dc);
 883 }
 884
 885 // kbd handling: notice that we use OnChar() and not OnKeyDown() for
 886 // compatibility here - if we used OnKeyDown(), the programs which process
 887 // arrows themselves in their OnChar() would never get the message and like
 888 // this they always have the priority
 889 void wxScrolledWindow::OnChar(wxKeyEvent& event)
 890 {
 891     int stx, sty,       // view origin
 892         szx, szy,       // view size (total)
 893         clix, cliy;     // view size (on screen)
 894
 895     GetViewStart(&stx, &sty);
 896     GetClientSize(&clix, &cliy);
 897     GetVirtualSize(&szx, &szy);
 898
 899     if( m_xScrollPixelsPerLine )
 900     {
 901         clix /= m_xScrollPixelsPerLine;
 902         szx /= m_xScrollPixelsPerLine;
 903     }
 904     else
 905     {
 906         clix = 0;
 907         szx = -1;
 908     }
 909     if( m_yScrollPixelsPerLine )
 910     {
 911         cliy /= m_yScrollPixelsPerLine;
 912         szy /= m_yScrollPixelsPerLine;
 913     }
 914     else
 915     {
 916         cliy = 0;
 917         szy = -1;
 918     }
 919
 920     int xScrollOld = GetScrollPos(wxHORIZONTAL),
 921         yScrollOld = GetScrollPos(wxVERTICAL);
 922
 923     int dsty;
 924     switch ( event.GetKeyCode() )
 925     {
 926         case WXK_PAGEUP:
 927         case WXK_PRIOR:
 928             dsty = sty - (5 * cliy / 6);
 929             Scroll(-1, (dsty == -1) ? 0 : dsty);
 930             break;
 931
 932         case WXK_PAGEDOWN:
 933         case WXK_NEXT:
 934             Scroll(-1, sty + (5 * cliy / 6));
 935             break;
 936
 937         case WXK_HOME:
 938             Scroll(0, event.ControlDown() ? 0 : -1);
 939             break;
 940
 941         case WXK_END:
 942             Scroll(szx - clix, event.ControlDown() ? szy - cliy : -1);
 943             break;
 944
 945         case WXK_UP:
 946             Scroll(-1, sty - 1);
 947             break;
 948
 949         case WXK_DOWN:
 950             Scroll(-1, sty + 1);
 951             break;
 952
 953         case WXK_LEFT:
 954             Scroll(stx - 1, -1);
 955             break;
 956
 957         case WXK_RIGHT:
 958             Scroll(stx + 1, -1);
 959             break;
 960
 961         default:
 962             // not for us
 963             event.Skip();
 964             return;
 965     }
 966
 967     int xScroll = GetScrollPos(wxHORIZONTAL);
 968     if ( xScroll != xScrollOld )
 969     {
 970         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, xScroll,
 971                                wxHORIZONTAL);
 972         event.SetEventObject(this);
 973         GetEventHandler()->ProcessEvent(event);
 974     }
 975
 976     int yScroll = GetScrollPos(wxVERTICAL);
 977     if ( yScroll != yScrollOld )
 978     {
 979         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, yScroll,
 980                                wxVERTICAL);
 981         event.SetEventObject(this);
 982         GetEventHandler()->ProcessEvent(event);
 983     }
 984 }
 985
 986
 987 // vi:sts=4:sw=4:et