src/generic/vlbox.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/generic/vlbox.cpp
   3 // Purpose:     implementation of wxVListBox
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     31.05.03
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2003 Vadim Zeitlin <vadim@wxwindows.org>
   9 // License:     wxWindows license
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #if wxUSE_LISTBOX
  28
  29 #include "wx/vlbox.h"
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/settings.h"
  33     #include "wx/dcclient.h"
  34     #include "wx/listbox.h"
  35 #endif //WX_PRECOMP
  36
  37 #include "wx/dcbuffer.h"
  38 #include "wx/selstore.h"
  39 #include "wx/renderer.h"
  40
  41 // ----------------------------------------------------------------------------
  42 // event tables
  43 // ----------------------------------------------------------------------------
  44
  45 BEGIN_EVENT_TABLE(wxVListBox, wxVScrolledWindow)
  46     EVT_PAINT(wxVListBox::OnPaint)
  47
  48     EVT_KEY_DOWN(wxVListBox::OnKeyDown)
  49     EVT_LEFT_DOWN(wxVListBox::OnLeftDown)
  50     EVT_LEFT_DCLICK(wxVListBox::OnLeftDClick)
  51
  52     EVT_SET_FOCUS(wxVListBox::OnSetOrKillFocus)
  53     EVT_KILL_FOCUS(wxVListBox::OnSetOrKillFocus)
  54 END_EVENT_TABLE()
  55
  56 // ============================================================================
  57 // implementation
  58 // ============================================================================
  59
  60 IMPLEMENT_ABSTRACT_CLASS(wxVListBox, wxVScrolledWindow)
  61
  62 // ----------------------------------------------------------------------------
  63 // wxVListBox creation
  64 // ----------------------------------------------------------------------------
  65
  66 void wxVListBox::Init()
  67 {
  68     m_current =
  69     m_anchor = wxNOT_FOUND;
  70     m_selStore = NULL;
  71 }
  72
  73 bool wxVListBox::Create(wxWindow *parent,
  74                         wxWindowID id,
  75                         const wxPoint& pos,
  76                         const wxSize& size,
  77                         long style,
  78                         const wxString& name)
  79 {
  80 #ifdef __WXMSW__
  81         if ((style & wxBORDER_MASK) == wxDEFAULT)
  82                 style |= wxBORDER_THEME;
  83 #endif
  84
  85     style |= wxWANTS_CHARS | wxFULL_REPAINT_ON_RESIZE;
  86     if ( !wxVScrolledWindow::Create(parent, id, pos, size, style, name) )
  87         return false;
  88
  89     if ( style & wxLB_MULTIPLE )
  90         m_selStore = new wxSelectionStore;
  91
  92     // make sure the native widget has the right colour since we do
  93     // transparent drawing by default
  94     SetBackgroundColour(GetBackgroundColour());
  95
  96     // leave m_colBgSel in an invalid state: it means for OnDrawBackground()
  97     // to use wxRendererNative instead of painting selection bg ourselves
  98     m_colBgSel = wxNullColour;
  99
 100     // flicker-free drawing requires this
 101     SetBackgroundStyle(wxBG_STYLE_CUSTOM);
 102
 103     return true;
 104 }
 105
 106 wxVListBox::~wxVListBox()
 107 {
 108     delete m_selStore;
 109 }
 110
 111 void wxVListBox::SetItemCount(size_t count)
 112 {
 113     if ( m_selStore )
 114     {
 115         // tell the selection store that our number of items has changed
 116         m_selStore->SetItemCount(count);
 117     }
 118
 119     SetRowCount(count);
 120 }
 121
 122 // ----------------------------------------------------------------------------
 123 // selection handling
 124 // ----------------------------------------------------------------------------
 125
 126 bool wxVListBox::IsSelected(size_t line) const
 127 {
 128     return m_selStore ? m_selStore->IsSelected(line) : (int)line == m_current;
 129 }
 130
 131 bool wxVListBox::Select(size_t item, bool select)
 132 {
 133     wxCHECK_MSG( m_selStore, false,
 134                  _T("Select() may only be used with multiselection listbox") );
 135
 136     wxCHECK_MSG( item < GetItemCount(), false,
 137                  _T("Select(): invalid item index") );
 138
 139     bool changed = m_selStore->SelectItem(item, select);
 140     if ( changed )
 141     {
 142         // selection really changed
 143         RefreshRow(item);
 144     }
 145
 146     DoSetCurrent(item);
 147
 148     return changed;
 149 }
 150
 151 bool wxVListBox::SelectRange(size_t from, size_t to)
 152 {
 153     wxCHECK_MSG( m_selStore, false,
 154                  _T("SelectRange() may only be used with multiselection listbox") );
 155
 156     // make sure items are in correct order
 157     if ( from > to )
 158     {
 159         size_t tmp = from;
 160         from = to;
 161         to = tmp;
 162     }
 163
 164     wxCHECK_MSG( to < GetItemCount(), false,
 165                     _T("SelectRange(): invalid item index") );
 166
 167     wxArrayInt changed;
 168     if ( !m_selStore->SelectRange(from, to, true, &changed) )
 169     {
 170         // too many items have changed, we didn't record them in changed array
 171         // so we have no choice but to refresh everything between from and to
 172         RefreshRows(from, to);
 173     }
 174     else // we've got the indices of the changed items
 175     {
 176         const size_t count = changed.GetCount();
 177         if ( !count )
 178         {
 179             // nothing changed
 180             return false;
 181         }
 182
 183         // refresh just the lines which have really changed
 184         for ( size_t n = 0; n < count; n++ )
 185         {
 186             RefreshRow(changed[n]);
 187         }
 188     }
 189
 190     // something changed
 191     return true;
 192 }
 193
 194 bool wxVListBox::DoSelectAll(bool select)
 195 {
 196     wxCHECK_MSG( m_selStore, false,
 197                  _T("SelectAll may only be used with multiselection listbox") );
 198
 199     size_t count = GetItemCount();
 200     if ( count )
 201     {
 202         wxArrayInt changed;
 203         if ( !m_selStore->SelectRange(0, count - 1, select) ||
 204                 !changed.IsEmpty() )
 205         {
 206             Refresh();
 207
 208             // something changed
 209             return true;
 210         }
 211     }
 212
 213     return false;
 214 }
 215
 216 bool wxVListBox::DoSetCurrent(int current)
 217 {
 218     wxASSERT_MSG( current == wxNOT_FOUND ||
 219                     (current >= 0 && (size_t)current < GetItemCount()),
 220                   _T("wxVListBox::DoSetCurrent(): invalid item index") );
 221
 222     if ( current == m_current )
 223     {
 224         // nothing to do
 225         return false;
 226     }
 227
 228     if ( m_current != wxNOT_FOUND )
 229         RefreshRow(m_current);
 230
 231     m_current = current;
 232
 233     if ( m_current != wxNOT_FOUND )
 234     {
 235         // if the line is not visible at all, we scroll it into view but we
 236         // don't need to refresh it -- it will be redrawn anyhow
 237         if ( !IsVisible(m_current) )
 238         {
 239             ScrollToRow(m_current);
 240         }
 241         else // line is at least partly visible
 242         {
 243             // it is, indeed, only partly visible, so scroll it into view to
 244             // make it entirely visible
 245             while ( (size_t)m_current + 1 == GetVisibleRowsEnd() &&
 246                     ScrollToRow(GetVisibleBegin() + 1) ) ;
 247
 248             // but in any case refresh it as even if it was only partly visible
 249             // before we need to redraw it entirely as its background changed
 250             RefreshRow(m_current);
 251         }
 252     }
 253
 254     return true;
 255 }
 256
 257 void wxVListBox::SendSelectedEvent()
 258 {
 259     wxASSERT_MSG( m_current != wxNOT_FOUND,
 260                     _T("SendSelectedEvent() shouldn't be called") );
 261
 262     wxCommandEvent event(wxEVT_COMMAND_LISTBOX_SELECTED, GetId());
 263     event.SetEventObject(this);
 264     event.SetInt(m_current);
 265
 266     (void)GetEventHandler()->ProcessEvent(event);
 267 }
 268
 269 void wxVListBox::SetSelection(int selection)
 270 {
 271     wxCHECK_RET( selection == wxNOT_FOUND ||
 272                   (selection >= 0 && (size_t)selection < GetItemCount()),
 273                   _T("wxVListBox::SetSelection(): invalid item index") );
 274
 275     if ( HasMultipleSelection() )
 276     {
 277         if (selection != wxNOT_FOUND)
 278             Select(selection);
 279         else
 280             DeselectAll();
 281         m_anchor = selection;
 282     }
 283
 284     DoSetCurrent(selection);
 285 }
 286
 287 size_t wxVListBox::GetSelectedCount() const
 288 {
 289     return m_selStore ? m_selStore->GetSelectedCount()
 290                       : m_current == wxNOT_FOUND ? 0 : 1;
 291 }
 292
 293 int wxVListBox::GetFirstSelected(unsigned long& cookie) const
 294 {
 295     cookie = 0;
 296
 297     return GetNextSelected(cookie);
 298 }
 299
 300 int wxVListBox::GetNextSelected(unsigned long& cookie) const
 301 {
 302     wxCHECK_MSG( m_selStore, wxNOT_FOUND,
 303                   _T("GetFirst/NextSelected() may only be used with multiselection listboxes") );
 304
 305     while ( cookie < GetItemCount() )
 306     {
 307         if ( IsSelected(cookie++) )
 308             return cookie - 1;
 309     }
 310
 311     return wxNOT_FOUND;
 312 }
 313
 314 void wxVListBox::RefreshSelected()
 315 {
 316     // only refresh those items which are currently visible and selected:
 317     for ( size_t n = GetVisibleBegin(), end = GetVisibleEnd(); n < end; n++ )
 318     {
 319         if ( IsSelected(n) )
 320             RefreshRow(n);
 321     }
 322 }
 323
 324 // ----------------------------------------------------------------------------
 325 // wxVListBox appearance parameters
 326 // ----------------------------------------------------------------------------
 327
 328 void wxVListBox::SetMargins(const wxPoint& pt)
 329 {
 330     if ( pt != m_ptMargins )
 331     {
 332         m_ptMargins = pt;
 333
 334         Refresh();
 335     }
 336 }
 337
 338 void wxVListBox::SetSelectionBackground(const wxColour& col)
 339 {
 340     m_colBgSel = col;
 341 }
 342
 343 // ----------------------------------------------------------------------------
 344 // wxVListBox painting
 345 // ----------------------------------------------------------------------------
 346
 347 wxCoord wxVListBox::OnGetRowHeight(size_t line) const
 348 {
 349     return OnMeasureItem(line) + 2*m_ptMargins.y;
 350 }
 351
 352 void wxVListBox::OnDrawSeparator(wxDC& WXUNUSED(dc),
 353                                  wxRect& WXUNUSED(rect),
 354                                  size_t WXUNUSED(n)) const
 355 {
 356 }
 357
 358 void wxVListBox::OnDrawBackground(wxDC& dc, const wxRect& rect, size_t n) const
 359 {
 360     if ( m_colBgSel.IsOk() )
 361     {
 362         // we need to render selected and current items differently
 363         const bool isSelected = IsSelected(n),
 364                    isCurrent = IsCurrent(n);
 365         if ( isSelected || isCurrent )
 366         {
 367             if ( isSelected )
 368             {
 369                 dc.SetBrush(wxBrush(m_colBgSel, wxSOLID));
 370             }
 371             else // !selected
 372             {
 373                 dc.SetBrush(*wxTRANSPARENT_BRUSH);
 374             }
 375             dc.SetPen(*(isCurrent ? wxBLACK_PEN : wxTRANSPARENT_PEN));
 376             dc.DrawRectangle(rect);
 377         }
 378         //else: do nothing for the normal items
 379     }
 380     else // use wxRendererNative for a more native look&feel:
 381     {
 382         int flags = 0;
 383         if ( IsSelected(n) )
 384             flags |= wxCONTROL_SELECTED;
 385         if ( IsCurrent(n) )
 386             flags |= wxCONTROL_CURRENT;
 387         if ( wxWindow::FindFocus() == wx_const_cast(wxVListBox*, this) )
 388             flags |= wxCONTROL_FOCUSED;
 389
 390         wxRendererNative::Get().DrawItemSelectionRect(
 391             wx_const_cast(wxVListBox *, this), dc, rect, flags);
 392     }
 393 }
 394
 395 void wxVListBox::OnPaint(wxPaintEvent& WXUNUSED(event))
 396 {
 397     wxSize clientSize = GetClientSize();
 398
 399     wxAutoBufferedPaintDC dc(this);
 400
 401     // the update rectangle
 402     wxRect rectUpdate = GetUpdateClientRect();
 403
 404     // fill it with background colour
 405     dc.SetBackground(GetBackgroundColour());
 406     dc.Clear();
 407
 408     // the bounding rectangle of the current line
 409     wxRect rectRow;
 410     rectRow.width = clientSize.x;
 411
 412     // iterate over all visible lines
 413     const size_t lineMax = GetVisibleEnd();
 414     for ( size_t line = GetVisibleBegin(); line < lineMax; line++ )
 415     {
 416         const wxCoord hRow = OnGetRowHeight(line);
 417
 418         rectRow.height = hRow;
 419
 420         // and draw the ones which intersect the update rect
 421         if ( rectRow.Intersects(rectUpdate) )
 422         {
 423             // don't allow drawing outside of the lines rectangle
 424             wxDCClipper clip(dc, rectRow);
 425
 426             wxRect rect = rectRow;
 427             OnDrawBackground(dc, rect, line);
 428
 429             OnDrawSeparator(dc, rect, line);
 430
 431             rect.Deflate(m_ptMargins.x, m_ptMargins.y);
 432             OnDrawItem(dc, rect, line);
 433         }
 434         else // no intersection
 435         {
 436             if ( rectRow.GetTop() > rectUpdate.GetBottom() )
 437             {
 438                 // we are already below the update rect, no need to continue
 439                 // further
 440                 break;
 441             }
 442             //else: the next line may intersect the update rect
 443         }
 444
 445         rectRow.y += hRow;
 446     }
 447 }
 448
 449 void wxVListBox::OnSetOrKillFocus(wxFocusEvent& WXUNUSED(event))
 450 {
 451     // we need to repaint the selection when we get the focus since
 452     // wxRendererNative in general draws the focused selection differently
 453     // from the unfocused selection (see OnDrawItem):
 454     RefreshSelected();
 455 }
 456
 457
 458 // ============================================================================
 459 // wxVListBox keyboard/mouse handling
 460 // ============================================================================
 461
 462 void wxVListBox::DoHandleItemClick(int item, int flags)
 463 {
 464     // has anything worth telling the client code about happened?
 465     bool notify = false;
 466
 467     if ( HasMultipleSelection() )
 468     {
 469         // select the iteem clicked?
 470         bool select = true;
 471
 472         // NB: the keyboard interface we implement here corresponds to
 473         //     wxLB_EXTENDED rather than wxLB_MULTIPLE but this one makes more
 474         //     sense IMHO
 475         if ( flags & ItemClick_Shift )
 476         {
 477             if ( m_current != wxNOT_FOUND )
 478             {
 479                 if ( m_anchor == wxNOT_FOUND )
 480                     m_anchor = m_current;
 481
 482                 select = false;
 483
 484                 // only the range from the selection anchor to new m_current
 485                 // must be selected
 486                 if ( DeselectAll() )
 487                     notify = true;
 488
 489                 if ( SelectRange(m_anchor, item) )
 490                     notify = true;
 491             }
 492             //else: treat it as ordinary click/keypress
 493         }
 494         else // Shift not pressed
 495         {
 496             m_anchor = item;
 497
 498             if ( flags & ItemClick_Ctrl )
 499             {
 500                 select = false;
 501
 502                 if ( !(flags & ItemClick_Kbd) )
 503                 {
 504                     Toggle(item);
 505
 506                     // the status of the item has definitely changed
 507                     notify = true;
 508                 }
 509                 //else: Ctrl-arrow pressed, don't change selection
 510             }
 511             //else: behave as in single selection case
 512         }
 513
 514         if ( select )
 515         {
 516             // make the clicked item the only selection
 517             if ( DeselectAll() )
 518                 notify = true;
 519
 520             if ( Select(item) )
 521                 notify = true;
 522         }
 523     }
 524
 525     // in any case the item should become the current one
 526     if ( DoSetCurrent(item) )
 527     {
 528         if ( !HasMultipleSelection() )
 529         {
 530             // this has also changed the selection for single selection case
 531             notify = true;
 532         }
 533     }
 534
 535     if ( notify )
 536     {
 537         // notify the user about the selection change
 538         SendSelectedEvent();
 539     }
 540     //else: nothing changed at all
 541 }
 542
 543 // ----------------------------------------------------------------------------
 544 // keyboard handling
 545 // ----------------------------------------------------------------------------
 546
 547 void wxVListBox::OnKeyDown(wxKeyEvent& event)
 548 {
 549     // flags for DoHandleItemClick()
 550     int flags = ItemClick_Kbd;
 551
 552     int current;
 553     switch ( event.GetKeyCode() )
 554     {
 555         case WXK_HOME:
 556             current = 0;
 557             break;
 558
 559         case WXK_END:
 560             current = GetRowCount() - 1;
 561             break;
 562
 563         case WXK_DOWN:
 564             if ( m_current == (int)GetRowCount() - 1 )
 565                 return;
 566
 567             current = m_current + 1;
 568             break;
 569
 570         case WXK_UP:
 571             if ( m_current == wxNOT_FOUND )
 572                 current = GetRowCount() - 1;
 573             else if ( m_current != 0 )
 574                 current = m_current - 1;
 575             else // m_current == 0
 576                 return;
 577             break;
 578
 579         case WXK_PAGEDOWN:
 580             PageDown();
 581             current = GetVisibleBegin();
 582             break;
 583
 584         case WXK_PAGEUP:
 585             if ( m_current == (int)GetVisibleBegin() )
 586             {
 587                 PageUp();
 588             }
 589
 590             current = GetVisibleBegin();
 591             break;
 592
 593         case WXK_SPACE:
 594             // hack: pressing space should work like a mouse click rather than
 595             // like a keyboard arrow press, so trick DoHandleItemClick() in
 596             // thinking we were clicked
 597             flags &= ~ItemClick_Kbd;
 598             current = m_current;
 599             break;
 600
 601 #ifdef __WXMSW__
 602         case WXK_TAB:
 603             // Since we are using wxWANTS_CHARS we need to send navigation
 604             // events for the tabs on MSW
 605             HandleAsNavigationKey(event);
 606             // fall through to default
 607 #endif
 608         default:
 609             event.Skip();
 610             current = 0; // just to silent the stupid compiler warnings
 611             wxUnusedVar(current);
 612             return;
 613     }
 614
 615     if ( event.ShiftDown() )
 616        flags |= ItemClick_Shift;
 617     if ( event.ControlDown() )
 618         flags |= ItemClick_Ctrl;
 619
 620     DoHandleItemClick(current, flags);
 621 }
 622
 623 // ----------------------------------------------------------------------------
 624 // wxVListBox mouse handling
 625 // ----------------------------------------------------------------------------
 626
 627 void wxVListBox::OnLeftDown(wxMouseEvent& event)
 628 {
 629     SetFocus();
 630
 631     int item = VirtualHitTest(event.GetPosition().y);
 632
 633     if ( item != wxNOT_FOUND )
 634     {
 635         int flags = 0;
 636         if ( event.ShiftDown() )
 637            flags |= ItemClick_Shift;
 638
 639         // under Mac Apple-click is used in the same way as Ctrl-click
 640         // elsewhere
 641 #ifdef __WXMAC__
 642         if ( event.MetaDown() )
 643 #else
 644         if ( event.ControlDown() )
 645 #endif
 646             flags |= ItemClick_Ctrl;
 647
 648         DoHandleItemClick(item, flags);
 649     }
 650 }
 651
 652 void wxVListBox::OnLeftDClick(wxMouseEvent& eventMouse)
 653 {
 654     int item = VirtualHitTest(eventMouse.GetPosition().y);
 655     if ( item != wxNOT_FOUND )
 656     {
 657
 658         // if item double-clicked was not yet selected, then treat
 659         // this event as a left-click instead
 660         if ( item == m_current )
 661         {
 662             wxCommandEvent event(wxEVT_COMMAND_LISTBOX_DOUBLECLICKED, GetId());
 663             event.SetEventObject(this);
 664             event.SetInt(item);
 665
 666             (void)GetEventHandler()->ProcessEvent(event);
 667         }
 668         else
 669         {
 670             OnLeftDown(eventMouse);
 671         }
 672
 673     }
 674 }
 675
 676
 677 // ----------------------------------------------------------------------------
 678 // use the same default attributes as wxListBox
 679 // ----------------------------------------------------------------------------
 680
 681 //static
 682 wxVisualAttributes
 683 wxVListBox::GetClassDefaultAttributes(wxWindowVariant variant)
 684 {
 685     return wxListBox::GetClassDefaultAttributes(variant);
 686 }
 687
 688 #endif