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