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/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 #if wxUSE_CONSTRAINTS
 330     if (GetAutoLayout())
 331         Layout();
 332 #endif
 333 }
 334
 335 /*
 336  * pixelsPerUnitX/pixelsPerUnitY: number of pixels per unit (e.g. pixels per text line)
 337  * noUnitsX/noUnitsY:        : no. units per scrollbar
 338  */
 339 void wxScrolledWindow::SetScrollbars( int pixelsPerUnitX, int pixelsPerUnitY,
 340                                       int noUnitsX, int noUnitsY,
 341                                       int xPos, int yPos, bool noRefresh )
 342 {
 343     int xs, ys;
 344     GetViewStart (& xs, & ys);
 345
 346     int old_x = m_xScrollPixelsPerLine * xs;
 347     int old_y = m_yScrollPixelsPerLine * ys;
 348
 349     m_xScrollPixelsPerLine = pixelsPerUnitX;
 350     m_yScrollPixelsPerLine = pixelsPerUnitY;
 351
 352     m_hAdjust->value = m_xScrollPosition = xPos;
 353     m_vAdjust->value = m_yScrollPosition = yPos;
 354
 355     // Setting hints here should arguably be deprecated, but without it
 356     // a sizer might override this manual scrollbar setting in old code.
 357     m_targetWindow->SetVirtualSizeHints( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY );
 358
 359     m_targetWindow->SetVirtualSize( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY );
 360
 361     if (!noRefresh)
 362     {
 363         int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 364         int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 365
 366         m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
 367     }
 368 }
 369
 370 void wxScrolledWindow::AdjustScrollbars()
 371 {
 372     int w, h;
 373     int vw, vh;
 374
 375     m_targetWindow->GetClientSize( &w, &h );
 376     m_targetWindow->GetVirtualSize( &vw, &vh );
 377
 378     if (m_xScrollPixelsPerLine == 0)
 379     {
 380         m_hAdjust->upper = 1.0;
 381         m_hAdjust->page_increment = 1.0;
 382         m_hAdjust->page_size = 1.0;
 383     }
 384     else
 385     {
 386         m_hAdjust->upper = vw / m_xScrollPixelsPerLine;
 387         m_hAdjust->page_increment = (w / m_xScrollPixelsPerLine);
 388         m_hAdjust->page_size = m_hAdjust->page_increment;
 389
 390         // If the scrollbar hits the right side, move the window
 391         // right to keep it from over extending.
 392
 393         if ((m_hAdjust->value != 0.0) && (m_hAdjust->value + m_hAdjust->page_size > m_hAdjust->upper))
 394         {
 395             m_hAdjust->value = m_hAdjust->upper - m_hAdjust->page_size;
 396             if (m_hAdjust->value < 0.0)
 397                 m_hAdjust->value = 0.0;
 398
 399             if (GetChildren().GetCount() == 0)
 400                 m_xScrollPosition = (int)m_hAdjust->value; // This is enough without child windows
 401             else
 402                 gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" ); // Actually scroll window
 403         }
 404     }
 405
 406     if (m_yScrollPixelsPerLine == 0)
 407     {
 408         m_vAdjust->upper = 1.0;
 409         m_vAdjust->page_increment = 1.0;
 410         m_vAdjust->page_size = 1.0;
 411     }
 412     else
 413     {
 414         m_vAdjust->upper = vh / m_yScrollPixelsPerLine;
 415         m_vAdjust->page_increment = (h / m_yScrollPixelsPerLine);
 416         m_vAdjust->page_size = m_vAdjust->page_increment;
 417
 418         if ((m_vAdjust->value != 0.0) && (m_vAdjust->value + m_vAdjust->page_size > m_vAdjust->upper))
 419         {
 420             m_vAdjust->value = m_vAdjust->upper - m_vAdjust->page_size;
 421             if (m_vAdjust->value < 0.0)
 422                 m_vAdjust->value = 0.0;
 423
 424             if (GetChildren().GetCount() == 0)
 425                 m_yScrollPosition = (int)m_vAdjust->value;
 426             else
 427                 gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 428         }
 429     }
 430
 431     m_xScrollLinesPerPage = (int)(m_hAdjust->page_increment + 0.5);
 432     m_yScrollLinesPerPage = (int)(m_vAdjust->page_increment + 0.5);
 433
 434     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 435     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 436 }
 437
 438
 439 // ----------------------------------------------------------------------------
 440 // target window handling
 441 // ----------------------------------------------------------------------------
 442
 443 void wxScrolledWindow::SetTargetWindow( wxWindow *target, bool WXUNUSED(pushEventHandler) )
 444 {
 445     wxASSERT_MSG( target, wxT("target window must not be NULL") );
 446     m_targetWindow = target;
 447 }
 448
 449 wxWindow *wxScrolledWindow::GetTargetWindow() const
 450 {
 451     return m_targetWindow;
 452 }
 453
 454 // Override this function if you don't want to have wxScrolledWindow
 455 // automatically change the origin according to the scroll position.
 456 void wxScrolledWindow::PrepareDC(wxDC& dc)
 457 {
 458     dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,
 459                         -m_yScrollPosition * m_yScrollPixelsPerLine );
 460 }
 461
 462 void wxScrolledWindow::SetScrollRate( int xstep, int ystep )
 463 {
 464     int old_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 465     int old_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 466
 467     m_xScrollPixelsPerLine = xstep;
 468     m_yScrollPixelsPerLine = ystep;
 469
 470     int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 471     int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 472
 473     m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
 474
 475     AdjustScrollbars();
 476 }
 477
 478 void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 479 {
 480     if ( x_unit )
 481         *x_unit = m_xScrollPixelsPerLine;
 482     if ( y_unit )
 483         *y_unit = m_yScrollPixelsPerLine;
 484 }
 485
 486 int wxScrolledWindow::GetScrollPageSize(int orient) const
 487 {
 488     if ( orient == wxHORIZONTAL )
 489         return m_xScrollLinesPerPage;
 490     else
 491         return m_yScrollLinesPerPage;
 492 }
 493
 494 void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
 495 {
 496     if ( orient == wxHORIZONTAL )
 497         m_xScrollLinesPerPage = pageSize;
 498     else
 499         m_yScrollLinesPerPage = pageSize;
 500 }
 501
 502 void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)
 503 {
 504     int orient = event.GetOrientation();
 505
 506     int nScrollInc = CalcScrollInc(event);
 507     if (nScrollInc == 0) return;
 508
 509     if (orient == wxHORIZONTAL)
 510     {
 511         int newPos = m_xScrollPosition + nScrollInc;
 512         SetScrollPos(wxHORIZONTAL, newPos, TRUE );
 513     }
 514     else
 515     {
 516         int newPos = m_yScrollPosition + nScrollInc;
 517         SetScrollPos(wxVERTICAL, newPos, TRUE );
 518     }
 519
 520     if (orient == wxHORIZONTAL)
 521     {
 522         m_xScrollPosition += nScrollInc;
 523     }
 524     else
 525     {
 526         m_yScrollPosition += nScrollInc;
 527     }
 528
 529     if (orient == wxHORIZONTAL)
 530     {
 531        if (m_xScrollingEnabled)
 532             m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
 533        else
 534             m_targetWindow->Refresh();
 535     }
 536     else
 537     {
 538         if (m_yScrollingEnabled)
 539             m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
 540         else
 541             m_targetWindow->Refresh();
 542     }
 543 }
 544
 545 void wxScrolledWindow::Scroll( int x_pos, int y_pos )
 546 {
 547     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 548
 549     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
 550         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
 551
 552     if ((x_pos != -1) && (m_xScrollPixelsPerLine))
 553     {
 554         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 555         if (max < 0) max = 0;
 556         if (x_pos > max) x_pos = max;
 557         if (x_pos < 0) x_pos = 0;
 558
 559         int old_x = m_xScrollPosition;
 560         m_xScrollPosition = x_pos;
 561         m_hAdjust->value = x_pos;
 562
 563         m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
 564
 565         // Just update the scrollbar, don't send any wxWindows event
 566         GtkHDisconnectEvent();
 567         gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 568         GtkHConnectEvent();
 569     }
 570
 571     if ((y_pos != -1) && (m_yScrollPixelsPerLine))
 572     {
 573         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 574         if (max < 0) max = 0;
 575         if (y_pos > max) y_pos = max;
 576         if (y_pos < 0) y_pos = 0;
 577
 578         int old_y = m_yScrollPosition;
 579         m_yScrollPosition = y_pos;
 580         m_vAdjust->value = y_pos;
 581
 582         m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
 583
 584         // Just update the scrollbar, don't send any wxWindows event
 585         GtkVDisconnectEvent();
 586         gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 587         GtkVConnectEvent();
 588     }
 589 }
 590
 591 // TODO: [VH]Scroll functions should be combined
 592
 593 void wxScrolledWindow::GtkVScroll( float value, unsigned int scroll_type )
 594 {
 595     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 596
 597     if (m_yScrollPixelsPerLine == 0)
 598         return;
 599
 600     int y_pos = (int)(value+0.5);
 601
 602     if (y_pos == m_yScrollPosition)
 603         return;
 604
 605     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 606
 607     wxScrollWinEvent event( command, y_pos, wxVERTICAL );
 608     event.SetEventObject( this );
 609     GetEventHandler()->ProcessEvent( event );
 610 }
 611
 612 void wxScrolledWindow::GtkHScroll( float value, unsigned int scroll_type )
 613 {
 614     wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 615
 616     if (m_xScrollPixelsPerLine == 0)
 617         return;
 618
 619     int x_pos = (int)(value+0.5);
 620
 621     if (x_pos == m_xScrollPosition)
 622         return;
 623
 624     wxEventType command = GtkScrollWinTypeToWx(scroll_type);
 625
 626     wxScrollWinEvent event( command, x_pos, wxHORIZONTAL );
 627     event.SetEventObject( this );
 628     GetEventHandler()->ProcessEvent( event );
 629 }
 630
 631 void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
 632 {
 633     m_xScrollingEnabled = x_scroll;
 634     m_yScrollingEnabled = y_scroll;
 635 }
 636
 637 // Where the current view starts from
 638 void wxScrolledWindow::GetViewStart (int *x, int *y) const
 639 {
 640     if ( x )
 641         *x = m_xScrollPosition;
 642     if ( y )
 643         *y = m_yScrollPosition;
 644 }
 645
 646 void wxScrolledWindow::DoCalcScrolledPosition(int x, int y, int *xx, int *yy) const
 647 {
 648     int xs, ys;
 649     GetViewStart (& xs, & ys);
 650
 651     if ( xx )
 652         *xx = x - xs * m_xScrollPixelsPerLine;
 653     if ( yy )
 654         *yy = y - ys * m_yScrollPixelsPerLine;
 655 }
 656
 657 void wxScrolledWindow::DoCalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
 658 {
 659     int xs, ys;
 660     GetViewStart (& xs, & ys);
 661
 662     if ( xx )
 663         *xx = x + xs * m_xScrollPixelsPerLine;
 664     if ( yy )
 665         *yy = y + ys * m_yScrollPixelsPerLine;
 666 }
 667
 668 int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
 669 {
 670     int pos = event.GetPosition();
 671     int orient = event.GetOrientation();
 672
 673     int nScrollInc = 0;
 674     if (event.GetEventType() == wxEVT_SCROLLWIN_TOP)
 675     {
 676             if (orient == wxHORIZONTAL)
 677                 nScrollInc = - m_xScrollPosition;
 678             else
 679                 nScrollInc = - m_yScrollPosition;
 680     } else
 681     if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
 682     {
 683             if (orient == wxHORIZONTAL)
 684                 nScrollInc = GetVirtualSize().GetWidth() / m_xScrollPixelsPerLine - m_xScrollPosition;
 685             else
 686                 nScrollInc = GetVirtualSize().GetHeight() / m_yScrollPixelsPerLine - m_yScrollPosition;
 687     } else
 688     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
 689     {
 690             nScrollInc = -1;
 691     } else
 692     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN)
 693     {
 694             nScrollInc = 1;
 695     } else
 696     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEUP)
 697     {
 698             if (orient == wxHORIZONTAL)
 699                 nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
 700             else
 701                 nScrollInc = -GetScrollPageSize(wxVERTICAL);
 702     } else
 703     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEDOWN)
 704     {
 705             if (orient == wxHORIZONTAL)
 706                 nScrollInc = GetScrollPageSize(wxHORIZONTAL);
 707             else
 708                 nScrollInc = GetScrollPageSize(wxVERTICAL);
 709     } else
 710     if ((event.GetEventType() == wxEVT_SCROLLWIN_THUMBTRACK) ||
 711         (event.GetEventType() == wxEVT_SCROLLWIN_THUMBRELEASE))
 712     {
 713             if (orient == wxHORIZONTAL)
 714                 nScrollInc = pos - m_xScrollPosition;
 715             else
 716                 nScrollInc = pos - m_yScrollPosition;
 717     }
 718
 719     if (orient == wxHORIZONTAL)
 720     {
 721         if (m_xScrollPixelsPerLine > 0)
 722         {
 723             int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 724             if (max < 0) max = 0;
 725
 726             if ( (m_xScrollPosition + nScrollInc) < 0 )
 727                 nScrollInc = -m_xScrollPosition; // As -ve as we can go
 728             else if ( (m_xScrollPosition + nScrollInc) > max )
 729                 nScrollInc = max - m_xScrollPosition; // As +ve as we can go
 730         }
 731         else
 732             m_targetWindow->Refresh();
 733     }
 734     else
 735     {
 736         if (m_yScrollPixelsPerLine > 0)
 737         {
 738             int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 739             if (max < 0) max = 0;
 740
 741             if ( (m_yScrollPosition + nScrollInc) < 0 )
 742                 nScrollInc = -m_yScrollPosition; // As -ve as we can go
 743             else if ( (m_yScrollPosition + nScrollInc) > max )
 744                 nScrollInc = max - m_yScrollPosition; // As +ve as we can go
 745         }
 746         else
 747             m_targetWindow->Refresh();
 748     }
 749
 750     return nScrollInc;
 751 }
 752
 753 void wxScrolledWindow::SetScrollPos( int orient, int pos, bool refresh )
 754 {
 755     wxCHECK_RET( m_widget != NULL, wxT("invalid window") );
 756
 757     wxCHECK_RET( m_wxwindow != NULL, wxT("window needs client area for scrolling") );
 758
 759     if (orient == wxHORIZONTAL)
 760     {
 761         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 762         if (max < 0) max = 0;
 763
 764         if (pos > max) pos = 0;
 765         if (pos < 0) pos = 0;
 766
 767         if (pos == (int)(m_hAdjust->value+0.5)) return;
 768         m_hAdjust->value = pos;
 769     }
 770     else
 771     {
 772         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 773         if (max < 0) max = 0;
 774
 775         if (pos > max) pos = 0;
 776         if (pos < 0) pos = 0;
 777
 778         if (pos == (int)(m_vAdjust->value+0.5)) return;
 779         m_vAdjust->value = pos;
 780     }
 781
 782     if (m_wxwindow->window)
 783     {
 784         if (orient == wxHORIZONTAL)
 785         {
 786             // Just update the scrollbar, don't send any wxWindows event
 787             GtkHDisconnectEvent();
 788             gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 789             GtkHConnectEvent();
 790         }
 791         else
 792         {
 793             // Just update the scrollbar, don't send any wxWindows event
 794             GtkVDisconnectEvent();
 795             gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 796             GtkVConnectEvent();
 797         }
 798     }
 799 }
 800
 801 void wxScrolledWindow::GtkVConnectEvent()
 802 {
 803     gtk_signal_connect( GTK_OBJECT(m_vAdjust), "value_changed",
 804           (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 805 }
 806
 807 void wxScrolledWindow::GtkHConnectEvent()
 808 {
 809     gtk_signal_connect( GTK_OBJECT(m_hAdjust), "value_changed",
 810           (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 811 }
 812
 813 void wxScrolledWindow::GtkHDisconnectEvent()
 814 {
 815     gtk_signal_disconnect_by_func( GTK_OBJECT(m_hAdjust),
 816         (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 817 }
 818
 819 void wxScrolledWindow::GtkVDisconnectEvent()
 820 {
 821     gtk_signal_disconnect_by_func( GTK_OBJECT(m_vAdjust),
 822         (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 823 }
 824
 825 bool wxScrolledWindow::Layout()
 826 {
 827     if (GetSizer() && m_targetWindow == this)
 828     {
 829         // If we're the scroll target, take into account the
 830         // virtual size and scrolled position of the window.
 831
 832         int x, y, w, h;
 833         CalcScrolledPosition(0,0, &x,&y);
 834         GetVirtualSize(&w, &h);
 835         GetSizer()->SetDimension(x, y, w, h);
 836         return TRUE;
 837     }
 838     else
 839         return wxPanel::Layout();  // fall back to default for LayoutConstraints
 840 }
 841
 842 // ----------------------------------------------------------------------------
 843 // event handlers
 844 // ----------------------------------------------------------------------------
 845
 846 // Default OnSize resets scrollbars, if any
 847 void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 848 {
 849     if( GetAutoLayout() || m_targetWindow->GetAutoLayout() )
 850     {
 851         if( m_targetWindow != this )
 852             m_targetWindow->FitInside();
 853
 854         FitInside();
 855
 856         // FIXME:  Something is really weird here...  This should be
 857         // called by FitInside above (and apparently is), yet the
 858         // scrollsub sample will get the scrollbar wrong if resized
 859         // quickly.  This masks the bug, but is surely not the right
 860         // answer at all.
 861         AdjustScrollbars();
 862     }
 863     else
 864     {
 865         AdjustScrollbars();
 866     }
 867 }
 868
 869 // This calls OnDraw, having adjusted the origin according to the current
 870 // scroll position
 871 void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 872 {
 873     wxPaintDC dc(this);
 874     PrepareDC(dc);
 875
 876     OnDraw(dc);
 877 }
 878
 879 // kbd handling: notice that we use OnChar() and not OnKeyDown() for
 880 // compatibility here - if we used OnKeyDown(), the programs which process
 881 // arrows themselves in their OnChar() would never get the message and like
 882 // this they always have the priority
 883 void wxScrolledWindow::OnChar(wxKeyEvent& event)
 884 {
 885     int stx, sty,       // view origin
 886         szx, szy,       // view size (total)
 887         clix, cliy;     // view size (on screen)
 888
 889     GetViewStart(&stx, &sty);
 890     GetClientSize(&clix, &cliy);
 891     GetVirtualSize(&szx, &szy);
 892
 893     if( m_xScrollPixelsPerLine )
 894     {
 895         clix /= m_xScrollPixelsPerLine;
 896         szx /= m_xScrollPixelsPerLine;
 897     }
 898     else
 899     {
 900         clix = 0;
 901         szx = -1;
 902     }
 903     if( m_yScrollPixelsPerLine )
 904     {
 905         cliy /= m_yScrollPixelsPerLine;
 906         szy /= m_yScrollPixelsPerLine;
 907     }
 908     else
 909     {
 910         cliy = 0;
 911         szy = -1;
 912     }
 913
 914     int xScrollOld = GetScrollPos(wxHORIZONTAL),
 915         yScrollOld = GetScrollPos(wxVERTICAL);
 916
 917     int dsty;
 918     switch ( event.GetKeyCode() )
 919     {
 920         case WXK_PAGEUP:
 921         case WXK_PRIOR:
 922             dsty = sty - (5 * cliy / 6);
 923             Scroll(-1, (dsty == -1) ? 0 : dsty);
 924             break;
 925
 926         case WXK_PAGEDOWN:
 927         case WXK_NEXT:
 928             Scroll(-1, sty + (5 * cliy / 6));
 929             break;
 930
 931         case WXK_HOME:
 932             Scroll(0, event.ControlDown() ? 0 : -1);
 933             break;
 934
 935         case WXK_END:
 936             Scroll(szx - clix, event.ControlDown() ? szy - cliy : -1);
 937             break;
 938
 939         case WXK_UP:
 940             Scroll(-1, sty - 1);
 941             break;
 942
 943         case WXK_DOWN:
 944             Scroll(-1, sty + 1);
 945             break;
 946
 947         case WXK_LEFT:
 948             Scroll(stx - 1, -1);
 949             break;
 950
 951         case WXK_RIGHT:
 952             Scroll(stx + 1, -1);
 953             break;
 954
 955         default:
 956             // not for us
 957             event.Skip();
 958             return;
 959     }
 960
 961     int xScroll = GetScrollPos(wxHORIZONTAL);
 962     if ( xScroll != xScrollOld )
 963     {
 964         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, xScroll,
 965                                wxHORIZONTAL);
 966         event.SetEventObject(this);
 967         GetEventHandler()->ProcessEvent(event);
 968     }
 969
 970     int yScroll = GetScrollPos(wxVERTICAL);
 971     if ( yScroll != yScrollOld )
 972     {
 973         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, yScroll,
 974                                wxVERTICAL);
 975         event.SetEventObject(this);
 976         GetEventHandler()->ProcessEvent(event);
 977     }
 978 }
 979
 980
 981 // vi:sts=4:sw=4:et