src/gtk/scrolwin.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        generic/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
  63 //-----------------------------------------------------------------------------
  64 // idle system
  65 //-----------------------------------------------------------------------------
  66
  67 extern void wxapp_install_idle_handler();
  68 extern bool g_isIdle;
  69
  70 //-----------------------------------------------------------------------------
  71 // "value_changed" from m_vAdjust
  72 //-----------------------------------------------------------------------------
  73
  74 static void gtk_scrolled_window_vscroll_callback( GtkAdjustment *adjust, wxScrolledWindow *win )
  75 {
  76     if (g_isIdle)
  77         wxapp_install_idle_handler();
  78
  79     if (g_blockEventsOnDrag) return;
  80
  81     if (!win->m_hasVMT) return;
  82
  83     win->GtkVScroll( adjust->value );
  84 }
  85
  86 //-----------------------------------------------------------------------------
  87 // "value_changed" from m_hAdjust
  88 //-----------------------------------------------------------------------------
  89
  90 static void gtk_scrolled_window_hscroll_callback( GtkAdjustment *adjust, wxScrolledWindow *win )
  91 {
  92     if (g_isIdle)
  93         wxapp_install_idle_handler();
  94
  95     if (g_blockEventsOnDrag) return;
  96     if (!win->m_hasVMT) return;
  97
  98     win->GtkHScroll( adjust->value );
  99 }
 100
 101 //-----------------------------------------------------------------------------
 102 // InsertChild for wxScrolledWindow
 103 //-----------------------------------------------------------------------------
 104
 105 static void wxInsertChildInScrolledWindow( wxWindow* parent, wxWindow* child )
 106 {
 107     // The window might have been scrolled already, do we
 108     // have to adapt the position.
 109     GtkPizza *pizza = GTK_PIZZA(parent->m_wxwindow);
 110     child->m_x += pizza->xoffset;
 111     child->m_y += pizza->yoffset;
 112
 113     gtk_pizza_put( GTK_PIZZA(parent->m_wxwindow),
 114                      GTK_WIDGET(child->m_widget),
 115                      child->m_x,
 116                      child->m_y,
 117                      child->m_width,
 118                      child->m_height );
 119 }
 120
 121 // ----------------------------------------------------------------------------
 122 // wxScrolledWindow creation
 123 // ----------------------------------------------------------------------------
 124
 125 void wxScrolledWindow::Init()
 126 {
 127     m_xScrollPixelsPerLine = 0;
 128     m_yScrollPixelsPerLine = 0;
 129     m_xScrollingEnabled = TRUE;
 130     m_yScrollingEnabled = TRUE;
 131     m_xScrollPosition = 0;
 132     m_yScrollPosition = 0;
 133     m_xScrollLines = 0;
 134     m_yScrollLines = 0;
 135     m_xScrollLinesPerPage = 0;
 136     m_yScrollLinesPerPage = 0;
 137     m_targetWindow = (wxWindow*) NULL;
 138     m_scaleX = 1.0;
 139     m_scaleY = 1.0;
 140 }
 141
 142 bool wxScrolledWindow::Create(wxWindow *parent,
 143                               wxWindowID id,
 144                               const wxPoint& pos,
 145                               const wxSize& size,
 146                               long style,
 147                               const wxString& name)
 148 {
 149     Init();
 150
 151     if (!PreCreation( parent, pos, size ) ||
 152         !CreateBase( parent, id, pos, size, style, wxDefaultValidator, name ))
 153     {
 154         wxFAIL_MSG( wxT("wxWindow creation failed") );
 155         return FALSE;
 156     }
 157
 158     m_insertCallback = wxInsertChildInScrolledWindow;
 159
 160     m_targetWindow = this;
 161
 162     m_widget = gtk_scrolled_window_new( (GtkAdjustment *) NULL, (GtkAdjustment *) NULL );
 163     GTK_WIDGET_UNSET_FLAGS( m_widget, GTK_CAN_FOCUS );
 164
 165     GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(m_widget);
 166
 167     GtkScrolledWindowClass *scroll_class = GTK_SCROLLED_WINDOW_CLASS( GTK_OBJECT_GET_CLASS(m_widget) );
 168     scroll_class->scrollbar_spacing = 0;
 169
 170     gtk_scrolled_window_set_policy( scrolledWindow, GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC );
 171
 172     m_hAdjust = gtk_range_get_adjustment( GTK_RANGE(scrolledWindow->hscrollbar) );
 173     m_vAdjust = gtk_range_get_adjustment( GTK_RANGE(scrolledWindow->vscrollbar) );
 174
 175     m_wxwindow = gtk_pizza_new();
 176
 177     gtk_container_add( GTK_CONTAINER(m_widget), m_wxwindow );
 178
 179     GtkPizza *pizza = GTK_PIZZA(m_wxwindow);
 180
 181     if (HasFlag(wxRAISED_BORDER))
 182     {
 183         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_OUT );
 184     }
 185     else if (HasFlag(wxSUNKEN_BORDER))
 186     {
 187         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_IN );
 188     }
 189     else if (HasFlag(wxSIMPLE_BORDER))
 190     {
 191         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_THIN );
 192     }
 193     else
 194     {
 195         gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_NONE );
 196     }
 197
 198     GTK_WIDGET_SET_FLAGS( m_wxwindow, GTK_CAN_FOCUS );
 199     m_acceptsFocus = TRUE;
 200
 201     // I _really_ don't want scrollbars in the beginning
 202     m_vAdjust->lower = 0.0;
 203     m_vAdjust->upper = 1.0;
 204     m_vAdjust->value = 0.0;
 205     m_vAdjust->step_increment = 1.0;
 206     m_vAdjust->page_increment = 1.0;
 207     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 208     m_hAdjust->lower = 0.0;
 209     m_hAdjust->upper = 1.0;
 210     m_hAdjust->value = 0.0;
 211     m_hAdjust->step_increment = 1.0;
 212     m_hAdjust->page_increment = 1.0;
 213     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 214
 215     // Handlers for new scrollbar values
 216     GtkVConnectEvent();
 217     GtkHConnectEvent();
 218
 219     gtk_widget_show( m_wxwindow );
 220
 221     if (m_parent)
 222         m_parent->DoAddChild( this );
 223
 224     PostCreation();
 225
 226     Show( TRUE );
 227
 228     return TRUE;
 229 }
 230
 231 // ----------------------------------------------------------------------------
 232 // setting scrolling parameters
 233 // ----------------------------------------------------------------------------
 234
 235 /*
 236  * pixelsPerUnitX/pixelsPerUnitY: number of pixels per unit (e.g. pixels per text line)
 237  * noUnitsX/noUnitsY:        : no. units per scrollbar
 238  */
 239 void wxScrolledWindow::SetScrollbars (int pixelsPerUnitX, int pixelsPerUnitY,
 240                int noUnitsX, int noUnitsY,
 241                int xPos, int yPos, bool noRefresh )
 242 {
 243     m_xScrollPixelsPerLine = pixelsPerUnitX;
 244     m_yScrollPixelsPerLine = pixelsPerUnitY;
 245     m_xScrollPosition = xPos;
 246     m_yScrollPosition = yPos;
 247     m_xScrollLines = noUnitsX;
 248     m_yScrollLines = noUnitsY;
 249
 250     m_hAdjust->lower = 0.0;
 251     m_hAdjust->upper = noUnitsX;
 252     m_hAdjust->value = xPos;
 253     m_hAdjust->step_increment = 1.0;
 254     m_hAdjust->page_increment = 2.0;
 255
 256     m_vAdjust->lower = 0.0;
 257     m_vAdjust->upper = noUnitsY;
 258     m_vAdjust->value = yPos;
 259     m_vAdjust->step_increment = 1.0;
 260     m_vAdjust->page_increment = 2.0;
 261
 262     AdjustScrollbars();
 263 }
 264
 265 void wxScrolledWindow::AdjustScrollbars()
 266 {
 267     int w, h;
 268     m_targetWindow->GetClientSize( &w, &h );
 269
 270     if (m_xScrollPixelsPerLine == 0)
 271         m_hAdjust->page_size = 1.0;
 272     else
 273         m_hAdjust->page_size = (w / m_xScrollPixelsPerLine);
 274
 275     if (m_yScrollPixelsPerLine == 0)
 276         m_vAdjust->page_size = 1.0;
 277     else
 278         m_vAdjust->page_size = (h / m_yScrollPixelsPerLine);
 279
 280     m_xScrollLinesPerPage = (int)(m_hAdjust->page_size + 0.5);
 281     m_yScrollLinesPerPage = (int)(m_vAdjust->page_size + 0.5);
 282
 283     gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
 284     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 285 }
 286
 287 // ----------------------------------------------------------------------------
 288 // target window handling
 289 // ----------------------------------------------------------------------------
 290
 291 void wxScrolledWindow::SetTargetWindow( wxWindow *target )
 292 {
 293     wxASSERT_MSG( target, wxT("target window must not be NULL") );
 294     m_targetWindow = target;
 295 }
 296
 297 wxWindow *wxScrolledWindow::GetTargetWindow()
 298 {
 299     return m_targetWindow;
 300 }
 301
 302 // Override this function if you don't want to have wxScrolledWindow
 303 // automatically change the origin according to the scroll position.
 304 void wxScrolledWindow::PrepareDC(wxDC& dc)
 305 {
 306     dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,
 307                         -m_yScrollPosition * m_yScrollPixelsPerLine );
 308 }
 309
 310 void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 311 {
 312     if ( x_unit )
 313         *x_unit = m_xScrollPixelsPerLine;
 314     if ( y_unit )
 315         *y_unit = m_yScrollPixelsPerLine;
 316 }
 317
 318 int wxScrolledWindow::GetScrollPageSize(int orient) const
 319 {
 320     if ( orient == wxHORIZONTAL )
 321         return m_xScrollLinesPerPage;
 322     else
 323         return m_yScrollLinesPerPage;
 324 }
 325
 326 void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
 327 {
 328     if ( orient == wxHORIZONTAL )
 329         m_xScrollLinesPerPage = pageSize;
 330     else
 331         m_yScrollLinesPerPage = pageSize;
 332 }
 333
 334 void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)
 335 {
 336     int orient = event.GetOrientation();
 337
 338     int nScrollInc = CalcScrollInc(event);
 339     if (nScrollInc == 0) return;
 340
 341     if (orient == wxHORIZONTAL)
 342     {
 343         int newPos = m_xScrollPosition + nScrollInc;
 344         SetScrollPos(wxHORIZONTAL, newPos, TRUE );
 345     }
 346     else
 347     {
 348         int newPos = m_yScrollPosition + nScrollInc;
 349         SetScrollPos(wxVERTICAL, newPos, TRUE );
 350     }
 351
 352     if (orient == wxHORIZONTAL)
 353     {
 354         m_xScrollPosition += nScrollInc;
 355     }
 356     else
 357     {
 358         m_yScrollPosition += nScrollInc;
 359     }
 360
 361     if (orient == wxHORIZONTAL)
 362     {
 363        if (m_xScrollingEnabled)
 364             m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
 365        else
 366             m_targetWindow->Refresh();
 367     }
 368     else
 369     {
 370         if (m_yScrollingEnabled)
 371             m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
 372         else
 373             m_targetWindow->Refresh();
 374     }
 375 }
 376
 377 void wxScrolledWindow::Scroll( int x_pos, int y_pos )
 378 {
 379     if (!m_targetWindow)
 380         return;
 381
 382     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
 383         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
 384
 385     if ((x_pos != -1) && (m_xScrollPixelsPerLine))
 386     {
 387         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 388         if (max < 0) max = 0;
 389         if (x_pos > max) x_pos = max;
 390         if (x_pos < 0) x_pos = 0;
 391
 392         int old_x = m_xScrollPosition;
 393         m_xScrollPosition = x_pos;
 394         m_hAdjust->value = x_pos;
 395
 396         m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
 397
 398         // Just update the scrollbar, don't send any wxWindows event
 399         GtkHDisconnectEvent();
 400         gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 401         GtkHConnectEvent();
 402     }
 403
 404     if ((y_pos != -1) && (m_yScrollPixelsPerLine))
 405     {
 406         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 407         if (max < 0) max = 0;
 408         if (y_pos > max) y_pos = max;
 409         if (y_pos < 0) y_pos = 0;
 410
 411         int old_y = m_yScrollPosition;
 412         m_yScrollPosition = y_pos;
 413         m_vAdjust->value = y_pos;
 414
 415         m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
 416
 417         // Just update the scrollbar, don't send any wxWindows event
 418         GtkVDisconnectEvent();
 419         gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 420         GtkVConnectEvent();
 421     }
 422 }
 423
 424 void wxScrolledWindow::GtkVScroll( float value )
 425 {
 426     if (!m_targetWindow)
 427         return;
 428
 429     if (m_yScrollPixelsPerLine == 0)
 430         return;
 431
 432     int y_pos = (int)(value+0.5);
 433
 434     if (y_pos == m_yScrollPosition)
 435         return;
 436
 437     GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(m_widget);
 438     GtkRange *range = GTK_RANGE(scrolledWindow->vscrollbar);
 439
 440     wxEventType command = wxEVT_SCROLLWIN_THUMBTRACK;
 441     if      (range->scroll_type == GTK_SCROLL_STEP_BACKWARD) command = wxEVT_SCROLLWIN_LINEUP;
 442     else if (range->scroll_type == GTK_SCROLL_STEP_FORWARD)  command = wxEVT_SCROLLWIN_LINEDOWN;
 443     else if (range->scroll_type == GTK_SCROLL_PAGE_BACKWARD) command = wxEVT_SCROLLWIN_PAGEUP;
 444     else if (range->scroll_type == GTK_SCROLL_PAGE_FORWARD)  command = wxEVT_SCROLLWIN_PAGEDOWN;
 445
 446     wxScrollWinEvent event( command, y_pos, wxVERTICAL );
 447     event.SetEventObject( this );
 448     GetEventHandler()->ProcessEvent( event );
 449 }
 450
 451 void wxScrolledWindow::GtkHScroll( float value )
 452 {
 453     if (!m_targetWindow)
 454         return;
 455
 456     if (m_xScrollPixelsPerLine == 0)
 457         return;
 458
 459     int x_pos = (int)(value+0.5);
 460
 461     if (x_pos == m_xScrollPosition)
 462         return;
 463
 464     GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(m_widget);
 465     GtkRange *range = GTK_RANGE(scrolledWindow->hscrollbar);
 466
 467     wxEventType command = wxEVT_SCROLLWIN_THUMBTRACK;
 468     if      (range->scroll_type == GTK_SCROLL_STEP_BACKWARD) command = wxEVT_SCROLLWIN_LINEUP;
 469     else if (range->scroll_type == GTK_SCROLL_STEP_FORWARD)  command = wxEVT_SCROLLWIN_LINEDOWN;
 470     else if (range->scroll_type == GTK_SCROLL_PAGE_BACKWARD) command = wxEVT_SCROLLWIN_PAGEUP;
 471     else if (range->scroll_type == GTK_SCROLL_PAGE_FORWARD)  command = wxEVT_SCROLLWIN_PAGEDOWN;
 472
 473     wxScrollWinEvent event( command, x_pos, wxHORIZONTAL );
 474     event.SetEventObject( this );
 475     GetEventHandler()->ProcessEvent( event );
 476 }
 477
 478 void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
 479 {
 480     m_xScrollingEnabled = x_scroll;
 481     m_yScrollingEnabled = y_scroll;
 482 }
 483
 484 void wxScrolledWindow::GetVirtualSize (int *x, int *y) const
 485 {
 486     if ( x )
 487         *x = m_xScrollPixelsPerLine * m_xScrollLines;
 488     if ( y )
 489         *y = m_yScrollPixelsPerLine * m_yScrollLines;
 490 }
 491
 492 // Where the current view starts from
 493 void wxScrolledWindow::GetViewStart (int *x, int *y) const
 494 {
 495     if ( x )
 496         *x = m_xScrollPosition;
 497     if ( y )
 498         *y = m_yScrollPosition;
 499 }
 500
 501 void wxScrolledWindow::CalcScrolledPosition(int x, int y, int *xx, int *yy) const
 502 {
 503     if ( xx )
 504         *xx = x - m_xScrollPosition * m_xScrollPixelsPerLine;
 505     if ( yy )
 506         *yy = y - m_yScrollPosition * m_yScrollPixelsPerLine;
 507 }
 508
 509 void wxScrolledWindow::CalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
 510 {
 511     if ( xx )
 512         *xx = x + m_xScrollPosition * m_xScrollPixelsPerLine;
 513     if ( yy )
 514         *yy = y + m_yScrollPosition * m_yScrollPixelsPerLine;
 515 }
 516
 517 int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
 518 {
 519     int pos = event.GetPosition();
 520     int orient = event.GetOrientation();
 521
 522     int nScrollInc = 0;
 523     if (event.GetEventType() == wxEVT_SCROLLWIN_TOP)
 524     {
 525             if (orient == wxHORIZONTAL)
 526                 nScrollInc = - m_xScrollPosition;
 527             else
 528                 nScrollInc = - m_yScrollPosition;
 529     } else
 530     if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
 531     {
 532             if (orient == wxHORIZONTAL)
 533                 nScrollInc = m_xScrollLines - m_xScrollPosition;
 534             else
 535                 nScrollInc = m_yScrollLines - m_yScrollPosition;
 536     } else
 537     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
 538     {
 539             nScrollInc = -1;
 540     } else
 541     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN)
 542     {
 543             nScrollInc = 1;
 544     } else
 545     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEUP)
 546     {
 547             if (orient == wxHORIZONTAL)
 548                 nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
 549             else
 550                 nScrollInc = -GetScrollPageSize(wxVERTICAL);
 551     } else
 552     if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEDOWN)
 553     {
 554             if (orient == wxHORIZONTAL)
 555                 nScrollInc = GetScrollPageSize(wxHORIZONTAL);
 556             else
 557                 nScrollInc = GetScrollPageSize(wxVERTICAL);
 558     } else
 559     if ((event.GetEventType() == wxEVT_SCROLLWIN_THUMBTRACK) ||
 560         (event.GetEventType() == wxEVT_SCROLLWIN_THUMBRELEASE))
 561     {
 562             if (orient == wxHORIZONTAL)
 563                 nScrollInc = pos - m_xScrollPosition;
 564             else
 565                 nScrollInc = pos - m_yScrollPosition;
 566     }
 567
 568     if (orient == wxHORIZONTAL)
 569     {
 570         if (m_xScrollPixelsPerLine > 0)
 571         {
 572             int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 573             if (max < 0) max = 0;
 574
 575             if ( (m_xScrollPosition + nScrollInc) < 0 )
 576                 nScrollInc = -m_xScrollPosition; // As -ve as we can go
 577             else if ( (m_xScrollPosition + nScrollInc) > max )
 578                 nScrollInc = max - m_xScrollPosition; // As +ve as we can go
 579         }
 580         else
 581             m_targetWindow->Refresh();
 582     }
 583     else
 584     {
 585         if (m_yScrollPixelsPerLine > 0)
 586         {
 587             int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 588             if (max < 0) max = 0;
 589
 590             if ( (m_yScrollPosition + nScrollInc) < 0 )
 591                 nScrollInc = -m_yScrollPosition; // As -ve as we can go
 592             else if ( (m_yScrollPosition + nScrollInc) > max )
 593                 nScrollInc = max - m_yScrollPosition; // As +ve as we can go
 594         }
 595         else
 596             m_targetWindow->Refresh();
 597     }
 598
 599     return nScrollInc;
 600 }
 601
 602 void wxScrolledWindow::SetScrollPos( int orient, int pos, bool WXUNUSED(refresh) )
 603 {
 604     wxCHECK_RET( m_widget != NULL, wxT("invalid window") );
 605
 606     wxCHECK_RET( m_wxwindow != NULL, wxT("window needs client area for scrolling") );
 607
 608     if (orient == wxHORIZONTAL)
 609     {
 610         int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
 611         if (max < 0) max = 0;
 612
 613         if (pos > max) pos = 0;
 614         if (pos < 0) pos = 0;
 615
 616         if (pos == (int)(m_hAdjust->value+0.5)) return;
 617         m_hAdjust->value = pos;
 618     }
 619     else
 620     {
 621         int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
 622         if (max < 0) max = 0;
 623
 624         if (pos > max) pos = 0;
 625         if (pos < 0) pos = 0;
 626
 627         if (pos == (int)(m_vAdjust->value+0.5)) return;
 628         m_vAdjust->value = pos;
 629     }
 630
 631     if (m_wxwindow->window)
 632     {
 633         if (orient == wxHORIZONTAL)
 634         {
 635             // Just update the scrollbar, don't send any wxWindows event
 636             GtkHDisconnectEvent();
 637             gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
 638             GtkHConnectEvent();
 639         }
 640         else
 641         {
 642             // Just update the scrollbar, don't send any wxWindows event
 643             GtkVDisconnectEvent();
 644             gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
 645             GtkVConnectEvent();
 646         }
 647     }
 648 }
 649
 650 void wxScrolledWindow::GtkVConnectEvent()
 651 {
 652     gtk_signal_connect( GTK_OBJECT(m_vAdjust), "value_changed",
 653           (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 654 }
 655
 656 void wxScrolledWindow::GtkHConnectEvent()
 657 {
 658     gtk_signal_connect( GTK_OBJECT(m_hAdjust), "value_changed",
 659           (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 660 }
 661
 662 void wxScrolledWindow::GtkHDisconnectEvent()
 663 {
 664     gtk_signal_disconnect_by_func( GTK_OBJECT(m_hAdjust),
 665         (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
 666 }
 667
 668 void wxScrolledWindow::GtkVDisconnectEvent()
 669 {
 670     gtk_signal_disconnect_by_func( GTK_OBJECT(m_vAdjust),
 671         (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 672 }
 673
 674 // ----------------------------------------------------------------------------
 675 // event handlers
 676 // ----------------------------------------------------------------------------
 677
 678 // Default OnSize resets scrollbars, if any
 679 void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 680 {
 681 #if wxUSE_CONSTRAINTS
 682     if (GetAutoLayout())
 683         Layout();
 684 #endif
 685
 686     AdjustScrollbars();
 687 }
 688
 689 // This calls OnDraw, having adjusted the origin according to the current
 690 // scroll position
 691 void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
 692 {
 693     wxPaintDC dc(this);
 694     PrepareDC(dc);
 695
 696     OnDraw(dc);
 697 }
 698
 699 // kbd handling: notice that we use OnChar() and not OnKeyDown() for
 700 // compatibility here - if we used OnKeyDown(), the programs which process
 701 // arrows themselves in their OnChar() would never get the message and like
 702 // this they always have the priority
 703 void wxScrolledWindow::OnChar(wxKeyEvent& event)
 704 {
 705     int stx, sty,       // view origin
 706         szx, szy,       // view size (total)
 707         clix, cliy;     // view size (on screen)
 708
 709     ViewStart(&stx, &sty);
 710     GetClientSize(&clix, &cliy);
 711     GetVirtualSize(&szx, &szy);
 712
 713     if( m_xScrollPixelsPerLine )
 714     {
 715         clix /= m_xScrollPixelsPerLine;
 716         szx /= m_xScrollPixelsPerLine;
 717     }
 718     else
 719     {
 720         clix = 0;
 721         szx = -1;
 722     }
 723     if( m_yScrollPixelsPerLine )
 724     {
 725         cliy /= m_yScrollPixelsPerLine;
 726         szy /= m_yScrollPixelsPerLine;
 727     }
 728     else
 729     {
 730         cliy = 0;
 731         szy = -1;
 732     }
 733
 734     int dsty;
 735     switch ( event.KeyCode() )
 736     {
 737         case WXK_PAGEUP:
 738         case WXK_PRIOR:
 739             dsty = sty - (5 * cliy / 6);
 740             Scroll(-1, (dsty == -1) ? 0 : dsty);
 741             break;
 742
 743         case WXK_PAGEDOWN:
 744         case WXK_NEXT:
 745             Scroll(-1, sty + (5 * cliy / 6));
 746             break;
 747
 748         case WXK_HOME:
 749             Scroll(0, event.ControlDown() ? 0 : -1);
 750             break;
 751
 752         case WXK_END:
 753             Scroll(szx - clix, event.ControlDown() ? szy - cliy : -1);
 754             break;
 755
 756         case WXK_UP:
 757             Scroll(-1, sty - 1);
 758             break;
 759
 760         case WXK_DOWN:
 761             Scroll(-1, sty + 1);
 762             break;
 763
 764         case WXK_LEFT:
 765             Scroll(stx - 1, -1);
 766             break;
 767
 768         case WXK_RIGHT:
 769             Scroll(stx + 1, -1);
 770             break;
 771
 772         default:
 773             // not for us
 774             event.Skip();
 775     }
 776 }