src/gtk1/scrolwin.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        gtk/scrolwin.cpp
   3 // Purpose:     wxScrolledWindow implementation
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21     #pragma implementation "scrolwin.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #include "wx/utils.h"
  32 #include "wx/dcclient.h"
  33
  34 #include "wx/gtk/scrolwin.h"
  35 #include "wx/panel.h"
  36
  37 #include <gtk/gtk.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, wxScrolledWindow *win )
  76 {
  77     if (g_isIdle)
  78         wxapp_install_idle_handler();
  79
  80     if (g_blockEventsOnDrag) return;
  81
  82     if (!win->m_hasVMT) return;
  83
  84     win->GtkVScroll( adjust->value );
  85 }
  86
  87 //-----------------------------------------------------------------------------
  88 // "value_changed" from m_hAdjust
  89 //-----------------------------------------------------------------------------
  90
  91 static void gtk_scrolled_window_hscroll_callback( GtkAdjustment *adjust, wxScrolledWindow *win )
  92 {
  93     if (g_isIdle)
  94         wxapp_install_idle_handler();
  95
  96     if (g_blockEventsOnDrag) return;
  97     if (!win->m_hasVMT) return;
  98
  99     win->GtkHScroll( adjust->value );
 100 }
 101
 102 //-----------------------------------------------------------------------------
 103 // "button_press_event" from scrollbar
 104 //-----------------------------------------------------------------------------
 105
 106 static gint gtk_scrollbar_button_press_callback( GtkRange *widget,
 107                                                  GdkEventButton *gdk_event,
 108                                                  wxWindowGTK *win)
 109 {
 110     if (g_isIdle)
 111         wxapp_install_idle_handler();
 112
 113     g_blockEventsOnScroll = TRUE;
 114     win->m_isScrolling = (gdk_event->window == widget->slider);
 115
 116     return FALSE;
 117 }
 118
 119 //-----------------------------------------------------------------------------
 120 // "button_release_event" from scrollbar
 121 //-----------------------------------------------------------------------------
 122
 123 static gint gtk_scrollbar_button_release_callback( GtkRange *widget,
 124                                                    GdkEventButton *WXUNUSED(gdk_event),
 125                                                    wxWindowGTK *win)
 126 {
 127 //  don't test here as we can release the mouse while being over
 128 //  a different window than the slider
 129 //
 130 //    if (gdk_event->window != widget->slider) return FALSE;
 131
 132     g_blockEventsOnScroll = FALSE;
 133
 134     if (win->m_isScrolling)
 135     {
 136         wxEventType command = wxEVT_SCROLLWIN_THUMBRELEASE;
 137         int value = -1;
 138         int dir = -1;
 139
 140         GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(win->m_widget);
 141         if (widget == GTK_RANGE(scrolledWindow->hscrollbar))
 142         {
 143             value = (int)(win->m_hAdjust->value+0.5);
 144             dir = wxHORIZONTAL;
 145         }
 146         if (widget == GTK_RANGE(scrolledWindow->vscrollbar))
 147         {
 148             value = (int)(win->m_vAdjust->value+0.5);
 149             dir = wxVERTICAL;
 150         }
 151
 152         wxScrollWinEvent event( command, value, dir );
 153         event.SetEventObject( win );
 154         win->GetEventHandler()->ProcessEvent( event );
 155     }
 156
 157     win->m_isScrolling = FALSE;
 158
 159     return FALSE;
 160 }
 161
 162 //-----------------------------------------------------------------------------
 163 // InsertChild for wxScrolledWindow
 164 //-----------------------------------------------------------------------------
 165
 166 static void wxInsertChildInScrolledWindow( wxWindow* parent, wxWindow* child )
 167 {
 168     // The window might have been scrolled already, do we
 169     // have to adapt the position.
 170     GtkPizza *pizza = GTK_PIZZA(parent->m_wxwindow);
 171     child->m_x += pizza->xoffset;
 172     child->m_y += pizza->yoffset;
 173
 174     gtk_pizza_put( GTK_PIZZA(parent->m_wxwindow),
 175                      GTK_WIDGET(child->m_widget),
 176                      child->m_x,
 177                      child->m_y,
 178                      child->m_width,
 179                      child->m_height );
 180 }
 181
 182 // ----------------------------------------------------------------------------
 183 // wxScrolledWindow creation
 184 // ----------------------------------------------------------------------------
 185
 186 void wxScrolledWindow::Init()
 187 {
 188     m_xScrollPixelsPerLine = 0;
 189     m_yScrollPixelsPerLine = 0;
 190     m_xScrollingEnabled = TRUE;
 191     m_yScrollingEnabled = TRUE;
 192     m_xScrollPosition = 0;
 193     m_yScrollPosition = 0;
 194     m_xScrollLines = 0;
 195     m_yScrollLines = 0;
 196     m_xScrollLinesPerPage = 0;
 197     m_yScrollLinesPerPage = 0;
 198     m_targetWindow = (wxWindow*) NULL;
 199     m_scaleX = 1.0;
 200     m_scaleY = 1.0;
 201     m_hasScrolling = TRUE;
 202 }
 203
 204 bool wxScrolledWindow::Create(wxWindow *parent,
 205                               wxWindowID id,
 206                               const wxPoint& pos,
 207                               const wxSize& size,
 208                               long style,
 209                               const wxString& name)
 210 {
 211     Init();
 212
 213     if (!PreCreation( parent, pos, size ) ||
 214         !CreateBase( parent, id, pos, size, style, wxDefaultValidator, name ))
 215     {
 216         wxFAIL_MSG( wxT("wxWindow creation failed") );
 217         return FALSE;
 218     }
 219
 220     m_insertCallback = wxInsertChildInScrolledWindow;
 221
 222     m_targetWindow = this;
 223
 224     m_widget = gtk_scrolled_window_new( (GtkAdjustment *) NULL, (GtkAdjustment *) NULL );
 225     GTK_WIDGET_UNSET_FLAGS( m_widget, GTK_CAN_FOCUS );
 226
 227     GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(m_widget);
 228
 229     GtkScrolledWindowClass *scroll_class = GTK_SCROLLED_WINDOW_CLASS( GTK_OBJECT_GET_CLASS(m_widget) );
 230     scroll_class->scrollbar_spacing = 0;
 231
 232     gtk_scrolled_window_set_policy( scrolledWindow, GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC );
 233
 234     m_hAdjust = gtk_range_get_adjustment( GTK_RANGE(scrolledWindow->hscrollbar) );
 235     m_vAdjust = gtk_range_get_adjustment( GTK_RANGE(scrolledWindow->vscrollbar) );
 236
 237     m_wxwindow = gtk_pizza_new();
 238
 239     gtk_container_add( GTK_CONTAINER(m_widget), m_wxwindow );
 240
 241     GtkPizza *pizza = GTK_PIZZA(m_wxwindow);
 242
 243     if (HasFlag(wxRAISED_BORDER))
 244     {
 245         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_OUT );
 246     }
 247     else if (HasFlag(wxSUNKEN_BORDER))
 248     {
 249         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_IN );
 250     }
 251     else if (HasFlag(wxSIMPLE_BORDER))
 252     {
 253         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_THIN );
 254     }
 255     else
 256     {
 257         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_NONE );
 258     }
 259
 260     GTK_WIDGET_SET_FLAGS( m_wxwindow, GTK_CAN_FOCUS );
 261     m_acceptsFocus = TRUE;
 262
 263     // I _really_ don't want scrollbars in the beginning
 264     m_vAdjust->lower = 0.0;
 265     m_vAdjust->upper = 1.0;
 266     m_vAdjust->value = 0.0;
 267     m_vAdjust->step_increment = 1.0;
 268     m_vAdjust->page_increment = 1.0;
 269     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 270     m_hAdjust->lower = 0.0;
 271     m_hAdjust->upper = 1.0;
 272     m_hAdjust->value = 0.0;
 273     m_hAdjust->step_increment = 1.0;
 274     m_hAdjust->page_increment = 1.0;
 275     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 276
 277     // Handlers for new scrollbar values
 278     GtkVConnectEvent();
 279     GtkHConnectEvent();
 280
 281     // these handlers block mouse events to any window during scrolling such as
 282     // motion events and prevent GTK and wxWindows from fighting over where the
 283     // slider should be
 284
 285     gtk_signal_connect( GTK_OBJECT(scrolledWindow->vscrollbar), "button_press_event",
 286           (GtkSignalFunc)gtk_scrollbar_button_press_callback, (gpointer) this );
 287
 288     gtk_signal_connect( GTK_OBJECT(scrolledWindow->hscrollbar), "button_press_event",
 289           (GtkSignalFunc)gtk_scrollbar_button_press_callback, (gpointer) this );
 290
 291     gtk_signal_connect( GTK_OBJECT(scrolledWindow->vscrollbar), "button_release_event",
 292           (GtkSignalFunc)gtk_scrollbar_button_release_callback, (gpointer) this );
 293
 294     gtk_signal_connect( GTK_OBJECT(scrolledWindow->hscrollbar), "button_release_event",
 295           (GtkSignalFunc)gtk_scrollbar_button_release_callback, (gpointer) this );
 296
 297     gtk_widget_show( m_wxwindow );
 298
 299     if (m_parent)
 300         m_parent->DoAddChild( this );
 301
 302     m_focusWidget = m_wxwindow;
 303
 304     PostCreation();
 305
 306     Show( TRUE );
 307
 308     return TRUE;
 309 }
 310
 311 // ----------------------------------------------------------------------------
 312 // setting scrolling parameters
 313 // ----------------------------------------------------------------------------
 314
 315 /*
 316  * pixelsPerUnitX/pixelsPerUnitY: number of pixels per unit (e.g. pixels per text line)
 317  * noUnitsX/noUnitsY:        : no. units per scrollbar
 318  */
 319 void wxScrolledWindow::SetScrollbars (int pixelsPerUnitX, int pixelsPerUnitY,
 320                int noUnitsX, int noUnitsY,
 321                int xPos, int yPos, bool noRefresh )
 322 {
 323     // Update any invalidates areas before the get moved/scrolled.
 324     Update();
 325
 326     int old_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 327     int old_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 328
 329     m_xScrollPixelsPerLine = pixelsPerUnitX;
 330     m_yScrollPixelsPerLine = pixelsPerUnitY;
 331     m_xScrollLines = noUnitsX;
 332     m_yScrollLines = noUnitsY;
 333     m_xScrollPosition = xPos;
 334     m_yScrollPosition = yPos;
 335
 336     m_hAdjust->lower = 0.0;
 337     m_hAdjust->upper = noUnitsX;
 338     m_hAdjust->value = xPos;
 339     m_hAdjust->step_increment = 1.0;
 340     m_hAdjust->page_increment = 2.0;
 341
 342     m_vAdjust->lower = 0.0;
 343     m_vAdjust->upper = noUnitsY;
 344     m_vAdjust->value = yPos;
 345     m_vAdjust->step_increment = 1.0;
 346     m_vAdjust->page_increment = 2.0;
 347
 348     AdjustScrollbars();
 349
 350     if (!noRefresh)
 351     {
 352         int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
 353         int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 354
 355         m_targetWindow->ScrollWindow( old_x-new_x, old_y-new_y );
 356     }
 357 }
 358
 359 void wxScrolledWindow::AdjustScrollbars()
 360 {
 361     // Update any invalidates areas before the get moved/scrolled.
 362     Update();
 363
 364     int w, h;
 365     m_targetWindow->GetClientSize( &w, &h );
 366
 367     if (m_xScrollPixelsPerLine == 0)
 368         m_hAdjust->page_size = 1.0;
 369     else
 370         m_hAdjust->page_size = (w / m_xScrollPixelsPerLine);
 371
 372     if (m_yScrollPixelsPerLine == 0)
 373         m_vAdjust->page_size = 1.0;
 374     else
 375         m_vAdjust->page_size = (h / m_yScrollPixelsPerLine);
 376
 377     m_xScrollLinesPerPage = (int)(m_hAdjust->page_size + 0.5);
 378     m_yScrollLinesPerPage = (int)(m_vAdjust->page_size + 0.5);
 379
 380     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 381     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 382 }
 383
 384 // ----------------------------------------------------------------------------
 385 // target window handling
 386 // ----------------------------------------------------------------------------
 387
 388 void wxScrolledWindow::SetTargetWindow( wxWindow *target, bool WXUNUSED(pushEventHandler) )
 389 {
 390     wxASSERT_MSG( target, wxT("target window must not be NULL") );
 391     m_targetWindow = target;
 392 }
 393
 394 wxWindow *wxScrolledWindow::GetTargetWindow()
 395 {
 396     return m_targetWindow;
 397 }
 398
 399 // Override this function if you don't want to have wxScrolledWindow
 400 // automatically change the origin according to the scroll position.
 401 void wxScrolledWindow::PrepareDC(wxDC& dc)
 402 {
 403     dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,
 404                         -m_yScrollPosition * m_yScrollPixelsPerLine );
 405 }
 406
 407 void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 408 {
 409     if ( x_unit )
 410         *x_unit = m_xScrollPixelsPerLine;
 411     if ( y_unit )
 412         *y_unit = m_yScrollPixelsPerLine;
 413 }
 414
 415 int wxScrolledWindow::GetScrollPageSize(int orient) const
 416 {
 417     if ( orient == wxHORIZONTAL )
 418         return m_xScrollLinesPerPage;
 419     else
 420         return m_yScrollLinesPerPage;
 421 }
 422
 423 void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
 424 {
 425     if ( orient == wxHORIZONTAL )
 426         m_xScrollLinesPerPage = pageSize;
 427     else
 428         m_yScrollLinesPerPage = pageSize;
 429 }
 430
 431 void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)
 432 {
 433     int orient = event.GetOrientation();
 434
 435     int nScrollInc = CalcScrollInc(event);
 436     if (nScrollInc == 0) return;
 437
 438     // Update any invalidates areas before the get moved/scrolled.
 439     Update();
 440
 441     if (orient == wxHORIZONTAL)
 442     {
 443         int newPos = m_xScrollPosition + nScrollInc;
 444         SetScrollPos(wxHORIZONTAL, newPos, TRUE );
 445     }
 446     else
 447     {
 448         int newPos = m_yScrollPosition + nScrollInc;
 449         SetScrollPos(wxVERTICAL, newPos, TRUE );
 450     }
 451
 452     if (orient == wxHORIZONTAL)
 453     {
 454         m_xScrollPosition += nScrollInc;
 455     }
 456     else
 457     {
 458         m_yScrollPosition += nScrollInc;
 459     }
 460
 461     if (orient == wxHORIZONTAL)
 462     {
 463        if (m_xScrollingEnabled)
 464             m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
 465        else
 466             m_targetWindow->Refresh();
 467     }
 468     else
 469     {
 470         if (m_yScrollingEnabled)
 471             m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
 472         else
 473             m_targetWindow->Refresh();
 474     }
 475 }
 476
 477 void wxScrolledWindow::Scroll( int x_pos, int y_pos )
 478 {
 479     if (!m_targetWindow)
 480         return;
 481
 482     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
 483         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
 484
 485     // Update any invalidates areas before the get moved/scrolled.
 486     Update();
 487
 488     if ((x_pos != -1) && (m_xScrollPixelsPerLine))
 489     {
 490         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 491         if (max < 0) max = 0;
 492         if (x_pos > max) x_pos = max;
 493         if (x_pos < 0) x_pos = 0;
 494
 495         int old_x = m_xScrollPosition;
 496         m_xScrollPosition = x_pos;
 497         m_hAdjust->value = x_pos;
 498
 499         m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
 500
 501         // Just update the scrollbar, don't send any wxWindows event
 502         GtkHDisconnectEvent();
 503         gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 504         GtkHConnectEvent();
 505     }
 506
 507     if ((y_pos != -1) && (m_yScrollPixelsPerLine))
 508     {
 509         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 510         if (max < 0) max = 0;
 511         if (y_pos > max) y_pos = max;
 512         if (y_pos < 0) y_pos = 0;
 513
 514         int old_y = m_yScrollPosition;
 515         m_yScrollPosition = y_pos;
 516         m_vAdjust->value = y_pos;
 517
 518         m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
 519
 520         // Just update the scrollbar, don't send any wxWindows event
 521         GtkVDisconnectEvent();
 522         gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 523         GtkVConnectEvent();
 524     }
 525 }
 526
 527 void wxScrolledWindow::GtkVScroll( float value )
 528 {
 529     if (!m_targetWindow)
 530         return;
 531
 532     if (m_yScrollPixelsPerLine == 0)
 533         return;
 534
 535     int y_pos = (int)(value+0.5);
 536
 537     if (y_pos == m_yScrollPosition)
 538         return;
 539
 540     // Update any invalidates areas before the get moved/scrolled.
 541     Update();
 542
 543     GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(m_widget);
 544     GtkRange *range = GTK_RANGE(scrolledWindow->vscrollbar);
 545
 546     wxEventType command = wxEVT_SCROLLWIN_THUMBTRACK;
 547     if      (range->scroll_type == GTK_SCROLL_STEP_BACKWARD) command = wxEVT_SCROLLWIN_LINEUP;
 548     else if (range->scroll_type == GTK_SCROLL_STEP_FORWARD)  command = wxEVT_SCROLLWIN_LINEDOWN;
 549     else if (range->scroll_type == GTK_SCROLL_PAGE_BACKWARD) command = wxEVT_SCROLLWIN_PAGEUP;
 550     else if (range->scroll_type == GTK_SCROLL_PAGE_FORWARD)  command = wxEVT_SCROLLWIN_PAGEDOWN;
 551
 552     wxScrollWinEvent event( command, y_pos, wxVERTICAL );
 553     event.SetEventObject( this );
 554     GetEventHandler()->ProcessEvent( event );
 555 }
 556
 557 void wxScrolledWindow::GtkHScroll( float value )
 558 {
 559     if (!m_targetWindow)
 560         return;
 561
 562     if (m_xScrollPixelsPerLine == 0)
 563         return;
 564
 565     int x_pos = (int)(value+0.5);
 566
 567     if (x_pos == m_xScrollPosition)
 568         return;
 569
 570     // Update any invalidates areas before the get moved/scrolled.
 571     Update();
 572
 573     GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(m_widget);
 574     GtkRange *range = GTK_RANGE(scrolledWindow->hscrollbar);
 575
 576     wxEventType command = wxEVT_SCROLLWIN_THUMBTRACK;
 577     if      (range->scroll_type == GTK_SCROLL_STEP_BACKWARD) command = wxEVT_SCROLLWIN_LINEUP;
 578     else if (range->scroll_type == GTK_SCROLL_STEP_FORWARD)  command = wxEVT_SCROLLWIN_LINEDOWN;
 579     else if (range->scroll_type == GTK_SCROLL_PAGE_BACKWARD) command = wxEVT_SCROLLWIN_PAGEUP;
 580     else if (range->scroll_type == GTK_SCROLL_PAGE_FORWARD)  command = wxEVT_SCROLLWIN_PAGEDOWN;
 581
 582     wxScrollWinEvent event( command, x_pos, wxHORIZONTAL );
 583     event.SetEventObject( this );
 584     GetEventHandler()->ProcessEvent( event );
 585 }
 586
 587 void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
 588 {
 589     m_xScrollingEnabled = x_scroll;
 590     m_yScrollingEnabled = y_scroll;
 591 }
 592
 593 void wxScrolledWindow::GetVirtualSize (int *x, int *y) const
 594 {
 595     if ( x )
 596         *x = m_xScrollPixelsPerLine * m_xScrollLines;
 597     if ( y )
 598         *y = m_yScrollPixelsPerLine * m_yScrollLines;
 599 }
 600
 601 // Where the current view starts from
 602 void wxScrolledWindow::GetViewStart (int *x, int *y) const
 603 {
 604     if ( x )
 605         *x = m_xScrollPosition;
 606     if ( y )
 607         *y = m_yScrollPosition;
 608 }
 609
 610 void wxScrolledWindow::CalcScrolledPosition(int x, int y, int *xx, int *yy) const
 611 {
 612     if ( xx )
 613         *xx = x - m_xScrollPosition * m_xScrollPixelsPerLine;
 614     if ( yy )
 615         *yy = y - m_yScrollPosition * m_yScrollPixelsPerLine;
 616 }
 617
 618 void wxScrolledWindow::CalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
 619 {
 620     if ( xx )
 621         *xx = x + m_xScrollPosition * m_xScrollPixelsPerLine;
 622     if ( yy )
 623         *yy = y + m_yScrollPosition * m_yScrollPixelsPerLine;
 624 }
 625
 626 int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
 627 {
 628     int pos = event.GetPosition();
 629     int orient = event.GetOrientation();
 630
 631     int nScrollInc = 0;
 632     if (event.GetEventType() == wxEVT_SCROLLWIN_TOP)
 633     {
 634             if (orient == wxHORIZONTAL)
 635                 nScrollInc = - m_xScrollPosition;
 636             else
 637                 nScrollInc = - m_yScrollPosition;
 638     } else
 639     if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
 640     {
 641             if (orient == wxHORIZONTAL)
 642                 nScrollInc = m_xScrollLines - m_xScrollPosition;
 643             else
 644                 nScrollInc = m_yScrollLines - m_yScrollPosition;
 645     } else
 646     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
 647     {
 648             nScrollInc = -1;
 649     } else
 650     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN)
 651     {
 652             nScrollInc = 1;
 653     } else
 654     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEUP)
 655     {
 656             if (orient == wxHORIZONTAL)
 657                 nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
 658             else
 659                 nScrollInc = -GetScrollPageSize(wxVERTICAL);
 660     } else
 661     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEDOWN)
 662     {
 663             if (orient == wxHORIZONTAL)
 664                 nScrollInc = GetScrollPageSize(wxHORIZONTAL);
 665             else
 666                 nScrollInc = GetScrollPageSize(wxVERTICAL);
 667     } else
 668     if ((event.GetEventType() == wxEVT_SCROLLWIN_THUMBTRACK) ||
 669         (event.GetEventType() == wxEVT_SCROLLWIN_THUMBRELEASE))
 670     {
 671             if (orient == wxHORIZONTAL)
 672                 nScrollInc = pos - m_xScrollPosition;
 673             else
 674                 nScrollInc = pos - m_yScrollPosition;
 675     }
 676
 677     if (orient == wxHORIZONTAL)
 678     {
 679         if (m_xScrollPixelsPerLine > 0)
 680         {
 681             int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 682             if (max < 0) max = 0;
 683
 684             if ( (m_xScrollPosition + nScrollInc) < 0 )
 685                 nScrollInc = -m_xScrollPosition; // As -ve as we can go
 686             else if ( (m_xScrollPosition + nScrollInc) > max )
 687                 nScrollInc = max - m_xScrollPosition; // As +ve as we can go
 688         }
 689         else
 690             m_targetWindow->Refresh();
 691     }
 692     else
 693     {
 694         if (m_yScrollPixelsPerLine > 0)
 695         {
 696             int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 697             if (max < 0) max = 0;
 698
 699             if ( (m_yScrollPosition + nScrollInc) < 0 )
 700                 nScrollInc = -m_yScrollPosition; // As -ve as we can go
 701             else if ( (m_yScrollPosition + nScrollInc) > max )
 702                 nScrollInc = max - m_yScrollPosition; // As +ve as we can go
 703         }
 704         else
 705             m_targetWindow->Refresh();
 706     }
 707
 708     return nScrollInc;
 709 }
 710
 711 void wxScrolledWindow::SetScrollPos( int orient, int pos, bool refresh )
 712 {
 713     wxCHECK_RET( m_widget != NULL, wxT("invalid window") );
 714
 715     wxCHECK_RET( m_wxwindow != NULL, wxT("window needs client area for scrolling") );
 716
 717     // Update any invalidates areas before the get moved/scrolled.
 718     // We ignore the refresh parameter here because it is meant
 719     // to control the behaviour AFTER scrolling happens.
 720     Update();
 721
 722     if (orient == wxHORIZONTAL)
 723     {
 724         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 725         if (max < 0) max = 0;
 726
 727         if (pos > max) pos = 0;
 728         if (pos < 0) pos = 0;
 729
 730         if (pos == (int)(m_hAdjust->value+0.5)) return;
 731         m_hAdjust->value = pos;
 732     }
 733     else
 734     {
 735         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 736         if (max < 0) max = 0;
 737
 738         if (pos > max) pos = 0;
 739         if (pos < 0) pos = 0;
 740
 741         if (pos == (int)(m_vAdjust->value+0.5)) return;
 742         m_vAdjust->value = pos;
 743     }
 744
 745     if (m_wxwindow->window)
 746     {
 747         if (orient == wxHORIZONTAL)
 748         {
 749             // Just update the scrollbar, don't send any wxWindows event
 750             GtkHDisconnectEvent();
 751             gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 752             GtkHConnectEvent();
 753         }
 754         else
 755         {
 756             // Just update the scrollbar, don't send any wxWindows event
 757             GtkVDisconnectEvent();
 758             gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 759             GtkVConnectEvent();
 760         }
 761     }
 762 }
 763
 764 void wxScrolledWindow::GtkVConnectEvent()
 765 {
 766     gtk_signal_connect( GTK_OBJECT(m_vAdjust), "value_changed",
 767           (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 768 }
 769
 770 void wxScrolledWindow::GtkHConnectEvent()
 771 {
 772     gtk_signal_connect( GTK_OBJECT(m_hAdjust), "value_changed",
 773           (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 774 }
 775
 776 void wxScrolledWindow::GtkHDisconnectEvent()
 777 {
 778     gtk_signal_disconnect_by_func( GTK_OBJECT(m_hAdjust),
 779         (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 780 }
 781
 782 void wxScrolledWindow::GtkVDisconnectEvent()
 783 {
 784     gtk_signal_disconnect_by_func( GTK_OBJECT(m_vAdjust),
 785         (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 786 }
 787
 788 // ----------------------------------------------------------------------------
 789 // event handlers
 790 // ----------------------------------------------------------------------------
 791
 792 // Default OnSize resets scrollbars, if any
 793 void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 794 {
 795 #if wxUSE_CONSTRAINTS
 796     if (GetAutoLayout())
 797         Layout();
 798 #endif
 799
 800     AdjustScrollbars();
 801 }
 802
 803 // This calls OnDraw, having adjusted the origin according to the current
 804 // scroll position
 805 void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 806 {
 807     wxPaintDC dc(this);
 808     PrepareDC(dc);
 809
 810     OnDraw(dc);
 811 }
 812
 813 // kbd handling: notice that we use OnChar() and not OnKeyDown() for
 814 // compatibility here - if we used OnKeyDown(), the programs which process
 815 // arrows themselves in their OnChar() would never get the message and like
 816 // this they always have the priority
 817 void wxScrolledWindow::OnChar(wxKeyEvent& event)
 818 {
 819     int stx, sty,       // view origin
 820         szx, szy,       // view size (total)
 821         clix, cliy;     // view size (on screen)
 822
 823     ViewStart(&stx, &sty);
 824     GetClientSize(&clix, &cliy);
 825     GetVirtualSize(&szx, &szy);
 826
 827     if( m_xScrollPixelsPerLine )
 828     {
 829         clix /= m_xScrollPixelsPerLine;
 830         szx /= m_xScrollPixelsPerLine;
 831     }
 832     else
 833     {
 834         clix = 0;
 835         szx = -1;
 836     }
 837     if( m_yScrollPixelsPerLine )
 838     {
 839         cliy /= m_yScrollPixelsPerLine;
 840         szy /= m_yScrollPixelsPerLine;
 841     }
 842     else
 843     {
 844         cliy = 0;
 845         szy = -1;
 846     }
 847
 848     int xScrollOld = GetScrollPos(wxHORIZONTAL),
 849         yScrollOld = GetScrollPos(wxVERTICAL);
 850
 851     int dsty;
 852     switch ( event.KeyCode() )
 853     {
 854         case WXK_PAGEUP:
 855         case WXK_PRIOR:
 856             dsty = sty - (5 * cliy / 6);
 857             Scroll(-1, (dsty == -1) ? 0 : dsty);
 858             break;
 859
 860         case WXK_PAGEDOWN:
 861         case WXK_NEXT:
 862             Scroll(-1, sty + (5 * cliy / 6));
 863             break;
 864
 865         case WXK_HOME:
 866             Scroll(0, event.ControlDown() ? 0 : -1);
 867             break;
 868
 869         case WXK_END:
 870             Scroll(szx - clix, event.ControlDown() ? szy - cliy : -1);
 871             break;
 872
 873         case WXK_UP:
 874             Scroll(-1, sty - 1);
 875             break;
 876
 877         case WXK_DOWN:
 878             Scroll(-1, sty + 1);
 879             break;
 880
 881         case WXK_LEFT:
 882             Scroll(stx - 1, -1);
 883             break;
 884
 885         case WXK_RIGHT:
 886             Scroll(stx + 1, -1);
 887             break;
 888
 889         default:
 890             // not for us
 891             event.Skip();
 892             return;
 893     }
 894
 895     int xScroll = GetScrollPos(wxHORIZONTAL);
 896     if ( xScroll != xScrollOld )
 897     {
 898         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, xScroll,
 899                                wxHORIZONTAL);
 900         event.SetEventObject(this);
 901         GetEventHandler()->ProcessEvent(event);
 902     }
 903
 904     int yScroll = GetScrollPos(wxVERTICAL);
 905     if ( yScroll != yScrollOld )
 906     {
 907         wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, yScroll,
 908                                wxVERTICAL);
 909         event.SetEventObject(this);
 910         GetEventHandler()->ProcessEvent(event);
 911     }
 912 }
 913