src/univ/listbox.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/univ/listbox.cpp
   3 // Purpose:     wxListBox implementation
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     30.08.00
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2000 SciTech Software, Inc. (www.scitechsoft.com)
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #include "wx/wxprec.h"
  21
  22 #ifdef __BORLANDC__
  23     #pragma hdrstop
  24 #endif
  25
  26 #if wxUSE_LISTBOX
  27
  28 #ifndef WX_PRECOMP
  29     #include "wx/log.h"
  30
  31     #include "wx/dcclient.h"
  32     #include "wx/listbox.h"
  33     #include "wx/validate.h"
  34 #endif
  35
  36 #include "wx/univ/renderer.h"
  37 #include "wx/univ/inphand.h"
  38 #include "wx/univ/theme.h"
  39
  40 // ----------------------------------------------------------------------------
  41 // wxStdListboxInputHandler: handles mouse and kbd in a single or multi
  42 // selection listbox
  43 // ----------------------------------------------------------------------------
  44
  45 class WXDLLEXPORT wxStdListboxInputHandler : public wxStdInputHandler
  46 {
  47 public:
  48     // if pressing the mouse button in a multiselection listbox should toggle
  49     // the item under mouse immediately, then specify true as the second
  50     // parameter (this is the standard behaviour, under GTK the item is toggled
  51     // only when the mouse is released in the multi selection listbox)
  52     wxStdListboxInputHandler(wxInputHandler *inphand,
  53                              bool toggleOnPressAlways = true);
  54
  55     // base class methods
  56     virtual bool HandleKey(wxInputConsumer *consumer,
  57                            const wxKeyEvent& event,
  58                            bool pressed);
  59     virtual bool HandleMouse(wxInputConsumer *consumer,
  60                              const wxMouseEvent& event);
  61     virtual bool HandleMouseMove(wxInputConsumer *consumer,
  62                                  const wxMouseEvent& event);
  63
  64 protected:
  65     // return the item under mouse, 0 if the mouse is above the listbox or
  66     // GetCount() if it is below it
  67     int HitTest(const wxListBox *listbox, const wxMouseEvent& event);
  68
  69     // parts of HitTest(): first finds the pseudo (because not in range) index
  70     // of the item and the second one adjusts it if necessary - that is if the
  71     // third one returns false
  72     int HitTestUnsafe(const wxListBox *listbox, const wxMouseEvent& event);
  73     int FixItemIndex(const wxListBox *listbox, int item);
  74     bool IsValidIndex(const wxListBox *listbox, int item);
  75
  76     // init m_btnCapture and m_actionMouse
  77     wxControlAction SetupCapture(wxListBox *lbox,
  78                                  const wxMouseEvent& event,
  79                                  int item);
  80
  81     wxRenderer *m_renderer;
  82
  83     // the button which initiated the mouse capture (currently 0 or 1)
  84     int m_btnCapture;
  85
  86     // the action to perform when the mouse moves while we capture it
  87     wxControlAction m_actionMouse;
  88
  89     // the ctor parameter toggleOnPressAlways (see comments near it)
  90     bool m_toggleOnPressAlways;
  91
  92     // do we track the mouse outside the window when it is captured?
  93     bool m_trackMouseOutside;
  94 };
  95
  96 // ============================================================================
  97 // implementation of wxListBox
  98 // ============================================================================
  99
 100 IMPLEMENT_DYNAMIC_CLASS(wxListBox, wxControlWithItems)
 101
 102 BEGIN_EVENT_TABLE(wxListBox, wxListBoxBase)
 103     EVT_SIZE(wxListBox::OnSize)
 104 END_EVENT_TABLE()
 105
 106 // ----------------------------------------------------------------------------
 107 // construction
 108 // ----------------------------------------------------------------------------
 109
 110 void wxListBox::Init()
 111 {
 112     // will be calculated later when needed
 113     m_lineHeight = 0;
 114     m_itemsPerPage = 0;
 115     m_maxWidth = 0;
 116     m_scrollRangeY = 0;
 117     m_maxWidthItem = -1;
 118     m_strings.unsorted = NULL;
 119
 120     // no items hence no current item
 121     m_current = -1;
 122     m_selAnchor = -1;
 123     m_currentChanged = false;
 124
 125     // no need to update anything initially
 126     m_updateCount = 0;
 127
 128     // no scrollbars to show nor update
 129     m_updateScrollbarX =
 130     m_showScrollbarX =
 131     m_updateScrollbarY =
 132     m_showScrollbarY = false;
 133 }
 134
 135 wxListBox::wxListBox(wxWindow *parent,
 136                      wxWindowID id,
 137                      const wxPoint &pos,
 138                      const wxSize &size,
 139                      const wxArrayString& choices,
 140                      long style,
 141                      const wxValidator& validator,
 142                      const wxString &name)
 143           :wxScrollHelper(this)
 144 {
 145     Init();
 146
 147     Create(parent, id, pos, size, choices, style, validator, name);
 148 }
 149
 150 bool wxListBox::Create(wxWindow *parent,
 151                        wxWindowID id,
 152                        const wxPoint &pos,
 153                        const wxSize &size,
 154                        const wxArrayString& choices,
 155                        long style,
 156                        const wxValidator& validator,
 157                        const wxString &name)
 158 {
 159     wxCArrayString chs(choices);
 160
 161     return Create(parent, id, pos, size, chs.GetCount(), chs.GetStrings(),
 162                   style, validator, name);
 163 }
 164
 165 bool wxListBox::Create(wxWindow *parent,
 166                        wxWindowID id,
 167                        const wxPoint &pos,
 168                        const wxSize &size,
 169                        int n,
 170                        const wxString choices[],
 171                        long style,
 172                        const wxValidator& validator,
 173                        const wxString &name)
 174 {
 175     // for compatibility accept both the new and old styles - they mean the
 176     // same thing for us
 177     if ( style & wxLB_ALWAYS_SB )
 178         style |= wxALWAYS_SHOW_SB;
 179
 180     // if we don't have neither multiple nor extended flag, we must have the
 181     // single selection listbox
 182     if ( !(style & (wxLB_MULTIPLE | wxLB_EXTENDED)) )
 183         style |= wxLB_SINGLE;
 184
 185 #if wxUSE_TWO_WINDOWS
 186     style |=  wxVSCROLL|wxHSCROLL;
 187     if ((style & wxBORDER_MASK) == 0)
 188         style |= wxBORDER_SUNKEN;
 189 #endif
 190
 191     if ( !wxControl::Create(parent, id, pos, size, style,
 192                             validator, name) )
 193         return false;
 194
 195     if ( IsSorted() )
 196         m_strings.sorted = new wxSortedArrayString;
 197     else
 198         m_strings.unsorted = new wxArrayString;
 199
 200     Set(n, choices);
 201
 202     SetInitialSize(size);
 203
 204     CreateInputHandler(wxINP_HANDLER_LISTBOX);
 205
 206     return true;
 207 }
 208
 209 wxListBox::~wxListBox()
 210 {
 211     // call this just to free the client data -- and avoid leaking memory
 212     DoClear();
 213
 214     if ( IsSorted() )
 215         delete m_strings.sorted;
 216     else
 217         delete m_strings.unsorted;
 218
 219     m_strings.sorted = NULL;
 220 }
 221
 222 // ----------------------------------------------------------------------------
 223 // accessing strings
 224 // ----------------------------------------------------------------------------
 225
 226 unsigned int wxListBox::GetCount() const
 227 {
 228     return IsSorted() ? m_strings.sorted->size()
 229                       : m_strings.unsorted->size();
 230 }
 231
 232 wxString wxListBox::GetString(unsigned int n) const
 233 {
 234     return IsSorted() ? m_strings.sorted->Item(n)
 235                       : m_strings.unsorted->Item(n);
 236 }
 237
 238 int wxListBox::FindString(const wxString& s, bool bCase) const
 239 {
 240     return IsSorted() ? m_strings.sorted->Index(s, bCase)
 241                       : m_strings.unsorted->Index(s, bCase);
 242 }
 243
 244 // ----------------------------------------------------------------------------
 245 // adding/inserting strings
 246 // ----------------------------------------------------------------------------
 247
 248 int wxListBox::DoInsertItems(const wxArrayStringsAdapter& items,
 249                              unsigned int pos,
 250                              void **clientData,
 251                              wxClientDataType type)
 252 {
 253     int idx = wxNOT_FOUND;
 254
 255     const unsigned int numItems = items.GetCount();
 256     for ( unsigned int i = 0; i < numItems; ++i )
 257     {
 258         const wxString& item = items[i];
 259         idx = IsSorted() ? m_strings.sorted->Add(item)
 260                          : (m_strings.unsorted->Insert(item, pos), pos++);
 261
 262         m_itemsClientData.Insert(NULL, idx);
 263         AssignNewItemClientData(idx, clientData, i, type);
 264
 265         // call the wxCheckListBox hook
 266         OnItemInserted(idx);
 267     }
 268
 269     // the number of items has changed so we might have to show the scrollbar
 270     m_updateScrollbarY = true;
 271
 272     // the max width also might have changed - just recalculate it instead of
 273     // keeping track of it here, this is probably more efficient for a typical
 274     // use pattern
 275     RefreshHorzScrollbar();
 276
 277     // note that we have to refresh all the items after the ones we inserted,
 278     // not just these items
 279     RefreshFromItemToEnd(pos);
 280
 281     return idx;
 282 }
 283
 284 void wxListBox::SetString(unsigned int n, const wxString& s)
 285 {
 286     wxCHECK_RET( !IsSorted(), _T("can't set string in sorted listbox") );
 287
 288     if ( IsSorted() )
 289         (*m_strings.sorted)[n] = s;
 290     else
 291         (*m_strings.unsorted)[n] = s;
 292
 293     if ( HasHorzScrollbar() )
 294     {
 295         // we need to update m_maxWidth as changing the string may cause the
 296         // horz scrollbar [dis]appear
 297         wxCoord width;
 298
 299         GetTextExtent(s, &width, NULL);
 300
 301         // it might have increased if the new string is long
 302         if ( width > m_maxWidth )
 303         {
 304             m_maxWidth = width;
 305             m_maxWidthItem = n;
 306             m_updateScrollbarX = true;
 307         }
 308         // or also decreased if the old string was the longest one
 309         else if ( n == (unsigned int)m_maxWidthItem )
 310         {
 311             RefreshHorzScrollbar();
 312         }
 313     }
 314
 315     RefreshItem(n);
 316 }
 317
 318 // ----------------------------------------------------------------------------
 319 // removing strings
 320 // ----------------------------------------------------------------------------
 321
 322 void wxListBox::DoClear()
 323 {
 324     if ( IsSorted() )
 325         m_strings.sorted->Clear();
 326     else
 327         m_strings.unsorted->Clear();
 328
 329     m_itemsClientData.Clear();
 330     m_selections.Clear();
 331
 332     m_current = -1;
 333
 334     m_updateScrollbarY = true;
 335
 336     RefreshHorzScrollbar();
 337
 338     RefreshAll();
 339 }
 340
 341 void wxListBox::DoDeleteOneItem(unsigned int n)
 342 {
 343     wxCHECK_RET( IsValid(n),
 344                  _T("invalid index in wxListBox::Delete") );
 345
 346     // do it before removing the index as otherwise the last item will not be
 347     // refreshed (as GetCount() will be decremented)
 348     RefreshFromItemToEnd(n);
 349
 350     if ( IsSorted() )
 351         m_strings.sorted->RemoveAt(n);
 352     else
 353         m_strings.unsorted->RemoveAt(n);
 354
 355     m_itemsClientData.RemoveAt(n);
 356
 357     // when the item disappears we must not keep using its index
 358     if ( (int)n == m_current )
 359     {
 360         m_current = -1;
 361     }
 362     else if ( (int)n < m_current )
 363     {
 364         m_current--;
 365     }
 366     //else: current item may stay
 367
 368     // update the selections array: the indices of all seletected items after
 369     // the one being deleted must change and the item itselfm ust be removed
 370     int index = wxNOT_FOUND;
 371     unsigned int count = m_selections.GetCount();
 372     for ( unsigned int item = 0; item < count; item++ )
 373     {
 374         if ( m_selections[item] == (int)n )
 375         {
 376             // remember to delete it later
 377             index = item;
 378         }
 379         else if ( m_selections[item] > (int)n )
 380         {
 381             // to account for the index shift
 382             m_selections[item]--;
 383         }
 384         //else: nothing changed for this one
 385     }
 386
 387     if ( index != wxNOT_FOUND )
 388     {
 389         m_selections.RemoveAt(index);
 390     }
 391
 392     // the number of items has changed, hence the scrollbar may disappear
 393     m_updateScrollbarY = true;
 394
 395     // finally, if the longest item was deleted the scrollbar may disappear
 396     if ( (int)n == m_maxWidthItem )
 397     {
 398         RefreshHorzScrollbar();
 399     }
 400 }
 401
 402 // ----------------------------------------------------------------------------
 403 // client data handling
 404 // ----------------------------------------------------------------------------
 405
 406 void wxListBox::DoSetItemClientData(unsigned int n, void* clientData)
 407 {
 408     m_itemsClientData[n] = clientData;
 409 }
 410
 411 void *wxListBox::DoGetItemClientData(unsigned int n) const
 412 {
 413     return m_itemsClientData[n];
 414 }
 415
 416 // ----------------------------------------------------------------------------
 417 // selection
 418 // ----------------------------------------------------------------------------
 419
 420 void wxListBox::DoSetSelection(int n, bool select)
 421 {
 422     if ( select )
 423     {
 424         if ( n == wxNOT_FOUND )
 425         {
 426             if ( !HasMultipleSelection() )
 427             {
 428                 // selecting wxNOT_FOUND is documented to deselect all items
 429                 DeselectAll();
 430                 return;
 431             }
 432         }
 433         else if ( m_selections.Index(n) == wxNOT_FOUND )
 434         {
 435             if ( !HasMultipleSelection() )
 436             {
 437                 // selecting an item in a single selection listbox deselects
 438                 // all the others
 439                 DeselectAll();
 440             }
 441
 442             m_selections.Add(n);
 443
 444             RefreshItem(n);
 445         }
 446         //else: already selected
 447     }
 448     else // unselect
 449     {
 450         int index = m_selections.Index(n);
 451         if ( index != wxNOT_FOUND )
 452         {
 453             m_selections.RemoveAt(index);
 454
 455             RefreshItem(n);
 456         }
 457         //else: not selected
 458     }
 459
 460     // sanity check: a single selection listbox can't have more than one item
 461     // selected
 462     wxASSERT_MSG( HasMultipleSelection() || (m_selections.GetCount() < 2),
 463                   _T("multiple selected items in single selection lbox?") );
 464
 465     if ( select )
 466     {
 467         // the newly selected item becomes the current one
 468         SetCurrentItem(n);
 469     }
 470 }
 471
 472 int wxListBox::GetSelection() const
 473 {
 474     wxCHECK_MSG( !HasMultipleSelection(), wxNOT_FOUND,
 475                  _T("use wxListBox::GetSelections for ths listbox") );
 476
 477     return m_selections.IsEmpty() ? wxNOT_FOUND : m_selections[0];
 478 }
 479
 480 int wxCMPFUNC_CONV wxCompareInts(int *n, int *m)
 481 {
 482     return *n - *m;
 483 }
 484
 485 int wxListBox::GetSelections(wxArrayInt& selections) const
 486 {
 487     // always return sorted array to the user
 488     selections = m_selections;
 489     unsigned int count = m_selections.GetCount();
 490
 491     // don't call sort on an empty array
 492     if ( count )
 493     {
 494         selections.Sort(wxCompareInts);
 495     }
 496
 497     return count;
 498 }
 499
 500 // ----------------------------------------------------------------------------
 501 // refresh logic: we use delayed refreshing which allows to avoid multiple
 502 // refreshes (and hence flicker) in case when several listbox items are
 503 // added/deleted/changed subsequently
 504 // ----------------------------------------------------------------------------
 505
 506 void wxListBox::RefreshFromItemToEnd(int from)
 507 {
 508     RefreshItems(from, GetCount() - from);
 509 }
 510
 511 void wxListBox::RefreshItems(int from, int count)
 512 {
 513     switch ( m_updateCount )
 514     {
 515         case 0:
 516             m_updateFrom = from;
 517             m_updateCount = count;
 518             break;
 519
 520         case -1:
 521             // we refresh everything anyhow
 522             break;
 523
 524         default:
 525             // add these items to the others which we have to refresh
 526             if ( m_updateFrom < from )
 527             {
 528                 count += from - m_updateFrom;
 529                 if ( m_updateCount < count )
 530                     m_updateCount = count;
 531             }
 532             else // m_updateFrom >= from
 533             {
 534                 int updateLast = wxMax(m_updateFrom + m_updateCount,
 535                                        from + count);
 536                 m_updateFrom = from;
 537                 m_updateCount = updateLast - m_updateFrom;
 538             }
 539     }
 540 }
 541
 542 void wxListBox::RefreshItem(int n)
 543 {
 544     switch ( m_updateCount )
 545     {
 546         case 0:
 547             // refresh this item only
 548             m_updateFrom = n;
 549             m_updateCount = 1;
 550             break;
 551
 552         case -1:
 553             // we refresh everything anyhow
 554             break;
 555
 556         default:
 557             // add this item to the others which we have to refresh
 558             if ( m_updateFrom < n )
 559             {
 560                 if ( m_updateCount < n - m_updateFrom + 1 )
 561                     m_updateCount = n - m_updateFrom + 1;
 562             }
 563             else // n <= m_updateFrom
 564             {
 565                 m_updateCount += m_updateFrom - n;
 566                 m_updateFrom = n;
 567             }
 568     }
 569 }
 570
 571 void wxListBox::RefreshAll()
 572 {
 573     m_updateCount = -1;
 574 }
 575
 576 void wxListBox::RefreshHorzScrollbar()
 577 {
 578     m_maxWidth = 0; // recalculate it
 579     m_updateScrollbarX = true;
 580 }
 581
 582 void wxListBox::UpdateScrollbars()
 583 {
 584     wxSize size = GetClientSize();
 585
 586     // is our height enough to show all items?
 587     unsigned int nLines = GetCount();
 588     wxCoord lineHeight = GetLineHeight();
 589     bool showScrollbarY = (int)nLines*lineHeight > size.y;
 590
 591     // check the width too if required
 592     wxCoord charWidth, maxWidth;
 593     bool showScrollbarX;
 594     if ( HasHorzScrollbar() )
 595     {
 596         charWidth = GetCharWidth();
 597         maxWidth = GetMaxWidth();
 598         showScrollbarX = maxWidth > size.x;
 599     }
 600     else // never show it
 601     {
 602         charWidth = maxWidth = 0;
 603         showScrollbarX = false;
 604     }
 605
 606     // what should be the scrollbar range now?
 607     int scrollRangeX = showScrollbarX
 608                         ? (maxWidth + charWidth - 1) / charWidth + 2 // FIXME
 609                         : 0;
 610     int scrollRangeY = showScrollbarY
 611                         ? nLines +
 612                             (size.y % lineHeight + lineHeight - 1) / lineHeight
 613                         : 0;
 614
 615     // reset scrollbars if something changed: either the visibility status
 616     // or the range of a scrollbar which is shown
 617     if ( (showScrollbarY != m_showScrollbarY) ||
 618          (showScrollbarX != m_showScrollbarX) ||
 619          (showScrollbarY && (scrollRangeY != m_scrollRangeY)) ||
 620          (showScrollbarX && (scrollRangeX != m_scrollRangeX)) )
 621     {
 622         int x, y;
 623         GetViewStart(&x, &y);
 624         SetScrollbars(charWidth, lineHeight,
 625                       scrollRangeX, scrollRangeY,
 626                       x, y);
 627
 628         m_showScrollbarX = showScrollbarX;
 629         m_showScrollbarY = showScrollbarY;
 630
 631         m_scrollRangeX = scrollRangeX;
 632         m_scrollRangeY = scrollRangeY;
 633     }
 634 }
 635
 636 void wxListBox::UpdateItems()
 637 {
 638     // only refresh the items which must be refreshed
 639     if ( m_updateCount == -1 )
 640     {
 641         // refresh all
 642         wxLogTrace(_T("listbox"), _T("Refreshing all"));
 643
 644         Refresh();
 645     }
 646     else
 647     {
 648         wxSize size = GetClientSize();
 649         wxRect rect;
 650         rect.width = size.x;
 651         rect.height = size.y;
 652         rect.y += m_updateFrom*GetLineHeight();
 653         rect.height = m_updateCount*GetLineHeight();
 654
 655         // we don't need to calculate x position as we always refresh the
 656         // entire line(s)
 657         CalcScrolledPosition(0, rect.y, NULL, &rect.y);
 658
 659         wxLogTrace(_T("listbox"), _T("Refreshing items %d..%d (%d-%d)"),
 660                    m_updateFrom, m_updateFrom + m_updateCount - 1,
 661                    rect.GetTop(), rect.GetBottom());
 662
 663         Refresh(true, &rect);
 664     }
 665 }
 666
 667 void wxListBox::OnInternalIdle()
 668 {
 669     if ( m_updateScrollbarY || m_updateScrollbarX )
 670     {
 671         UpdateScrollbars();
 672
 673         m_updateScrollbarX =
 674         m_updateScrollbarY = false;
 675     }
 676
 677     if ( m_currentChanged )
 678     {
 679         DoEnsureVisible(m_current);
 680
 681         m_currentChanged = false;
 682     }
 683
 684     if ( m_updateCount )
 685     {
 686         UpdateItems();
 687
 688         m_updateCount = 0;
 689     }
 690     wxListBoxBase::OnInternalIdle();
 691 }
 692
 693 // ----------------------------------------------------------------------------
 694 // drawing
 695 // ----------------------------------------------------------------------------
 696
 697 wxBorder wxListBox::GetDefaultBorder() const
 698 {
 699     return wxBORDER_SUNKEN;
 700 }
 701
 702 void wxListBox::DoDraw(wxControlRenderer *renderer)
 703 {
 704     // adjust the DC to account for scrolling
 705     wxDC& dc = renderer->GetDC();
 706     PrepareDC(dc);
 707     dc.SetFont(GetFont());
 708
 709     // get the update rect
 710     wxRect rectUpdate = GetUpdateClientRect();
 711
 712     int yTop, yBottom;
 713     CalcUnscrolledPosition(0, rectUpdate.GetTop(), NULL, &yTop);
 714     CalcUnscrolledPosition(0, rectUpdate.GetBottom(), NULL, &yBottom);
 715
 716     // get the items which must be redrawn
 717     wxCoord lineHeight = GetLineHeight();
 718     unsigned int itemFirst = yTop / lineHeight,
 719                  itemLast = (yBottom + lineHeight - 1) / lineHeight,
 720                  itemMax = GetCount();
 721
 722     if ( itemFirst >= itemMax )
 723         return;
 724
 725     if ( itemLast > itemMax )
 726         itemLast = itemMax;
 727
 728     // do draw them
 729     wxLogTrace(_T("listbox"), _T("Repainting items %d..%d"),
 730                itemFirst, itemLast);
 731
 732     DoDrawRange(renderer, itemFirst, itemLast);
 733 }
 734
 735 void wxListBox::DoDrawRange(wxControlRenderer *renderer,
 736                             int itemFirst, int itemLast)
 737 {
 738     renderer->DrawItems(this, itemFirst, itemLast);
 739 }
 740
 741 // ----------------------------------------------------------------------------
 742 // size calculations
 743 // ----------------------------------------------------------------------------
 744
 745 bool wxListBox::SetFont(const wxFont& font)
 746 {
 747     if ( !wxControl::SetFont(font) )
 748         return false;
 749
 750     CalcItemsPerPage();
 751
 752     RefreshAll();
 753
 754     return true;
 755 }
 756
 757 void wxListBox::CalcItemsPerPage()
 758 {
 759     m_lineHeight = GetRenderer()->GetListboxItemHeight(GetCharHeight());
 760     m_itemsPerPage = GetClientSize().y / m_lineHeight;
 761 }
 762
 763 int wxListBox::GetItemsPerPage() const
 764 {
 765     if ( !m_itemsPerPage )
 766     {
 767         wxConstCast(this, wxListBox)->CalcItemsPerPage();
 768     }
 769
 770     return m_itemsPerPage;
 771 }
 772
 773 wxCoord wxListBox::GetLineHeight() const
 774 {
 775     if ( !m_lineHeight )
 776     {
 777         wxConstCast(this, wxListBox)->CalcItemsPerPage();
 778     }
 779
 780     return m_lineHeight;
 781 }
 782
 783 wxCoord wxListBox::GetMaxWidth() const
 784 {
 785     if ( m_maxWidth == 0 )
 786     {
 787         wxListBox *self = wxConstCast(this, wxListBox);
 788         wxCoord width;
 789         unsigned int count = GetCount();
 790         for ( unsigned int n = 0; n < count; n++ )
 791         {
 792             GetTextExtent(this->GetString(n), &width, NULL);
 793             if ( width > m_maxWidth )
 794             {
 795                 self->m_maxWidth = width;
 796                 self->m_maxWidthItem = n;
 797             }
 798         }
 799     }
 800
 801     return m_maxWidth;
 802 }
 803
 804 void wxListBox::OnSize(wxSizeEvent& event)
 805 {
 806     // recalculate the number of items per page
 807     CalcItemsPerPage();
 808
 809     // the scrollbars might [dis]appear
 810     m_updateScrollbarX =
 811     m_updateScrollbarY = true;
 812
 813     event.Skip();
 814 }
 815
 816 void wxListBox::DoSetFirstItem(int n)
 817 {
 818     SetCurrentItem(n);
 819 }
 820
 821 void wxListBox::DoSetSize(int x, int y,
 822                           int width, int height,
 823                           int sizeFlags)
 824 {
 825     if ( GetWindowStyle() & wxLB_INT_HEIGHT )
 826     {
 827         // we must round up the height to an entire number of rows
 828
 829         // the client area must contain an int number of rows, so take borders
 830         // into account
 831         wxRect rectBorders = GetRenderer()->GetBorderDimensions(GetBorder());
 832         wxCoord hBorders = rectBorders.y + rectBorders.height;
 833
 834         wxCoord hLine = GetLineHeight();
 835         height = ((height - hBorders + hLine - 1) / hLine)*hLine + hBorders;
 836     }
 837
 838     wxListBoxBase::DoSetSize(x, y, width, height, sizeFlags);
 839 }
 840
 841 wxSize wxListBox::DoGetBestClientSize() const
 842 {
 843     wxCoord width = 0,
 844             height = 0;
 845
 846     unsigned int count = GetCount();
 847     for ( unsigned int n = 0; n < count; n++ )
 848     {
 849         wxCoord w,h;
 850         GetTextExtent(this->GetString(n), &w, &h);
 851
 852         if ( w > width )
 853             width = w;
 854         if ( h > height )
 855             height = h;
 856     }
 857
 858     // if the listbox is empty, still give it some non zero (even if
 859     // arbitrary) size - otherwise, leave small margin around the strings
 860     if ( !width )
 861         width = 100;
 862     else
 863         width += 3*GetCharWidth();
 864
 865     if ( !height )
 866         height = GetCharHeight();
 867
 868     // we need the height of the entire listbox, not just of one line
 869     height *= wxMax(count, 7);
 870
 871     return wxSize(width, height);
 872 }
 873
 874 // ----------------------------------------------------------------------------
 875 // listbox actions
 876 // ----------------------------------------------------------------------------
 877
 878 bool wxListBox::SendEvent(wxEventType type, int item)
 879 {
 880     wxCommandEvent event(type, m_windowId);
 881     event.SetEventObject(this);
 882
 883     // use the current item by default
 884     if ( item == -1 )
 885     {
 886         item = m_current;
 887     }
 888
 889     // client data and string parameters only make sense if we have an item
 890     if ( item != -1 )
 891     {
 892         if ( HasClientObjectData() )
 893             event.SetClientObject(GetClientObject(item));
 894         else if ( HasClientUntypedData() )
 895             event.SetClientData(GetClientData(item));
 896
 897         event.SetString(GetString(item));
 898     }
 899
 900     event.SetInt(item);
 901
 902     return GetEventHandler()->ProcessEvent(event);
 903 }
 904
 905 void wxListBox::SetCurrentItem(int n)
 906 {
 907     if ( n != m_current )
 908     {
 909         if ( m_current != -1 )
 910             RefreshItem(m_current);
 911
 912         m_current = n;
 913
 914         if ( m_current != -1 )
 915         {
 916             m_currentChanged = true;
 917
 918             RefreshItem(m_current);
 919         }
 920     }
 921     //else: nothing to do
 922 }
 923
 924 bool wxListBox::FindItem(const wxString& prefix, bool strictlyAfter)
 925 {
 926     unsigned int count = GetCount();
 927     if ( count==0 )
 928     {
 929         // empty listbox, we can't find anything in it
 930         return false;
 931     }
 932
 933     // start either from the current item or from the next one if strictlyAfter
 934     // is true
 935     int first;
 936     if ( strictlyAfter )
 937     {
 938         // the following line will set first correctly to 0 if there is no
 939         // selection (m_current == -1)
 940         first = m_current == (int)(count - 1) ? 0 : m_current + 1;
 941     }
 942     else // start with the current
 943     {
 944         first = m_current == -1 ? 0 : m_current;
 945     }
 946
 947     int last = first == 0 ? count - 1 : first - 1;
 948
 949     // if this is not true we'd never exit from the loop below!
 950     wxASSERT_MSG( first < (int)count && last < (int)count, _T("logic error") );
 951
 952     // precompute it outside the loop
 953     size_t len = prefix.length();
 954
 955     // loop over all items in the listbox
 956     for ( int item = first; item != (int)last; item < (int)(count - 1) ? item++ : item = 0 )
 957     {
 958         if ( wxStrnicmp(this->GetString(item).c_str(), prefix, len) == 0 )
 959         {
 960             SetCurrentItem(item);
 961
 962             if ( !(GetWindowStyle() & wxLB_MULTIPLE) )
 963             {
 964                 DeselectAll(item);
 965                 SelectAndNotify(item);
 966
 967                 if ( GetWindowStyle() & wxLB_EXTENDED )
 968                     AnchorSelection(item);
 969             }
 970
 971             return true;
 972         }
 973     }
 974
 975     // nothing found
 976     return false;
 977 }
 978
 979 void wxListBox::EnsureVisible(int n)
 980 {
 981     if ( m_updateScrollbarY )
 982     {
 983         UpdateScrollbars();
 984
 985         m_updateScrollbarX =
 986         m_updateScrollbarY = false;
 987     }
 988
 989     DoEnsureVisible(n);
 990 }
 991
 992 void wxListBox::DoEnsureVisible(int n)
 993 {
 994     if ( !m_showScrollbarY )
 995     {
 996         // nothing to do - everything is shown anyhow
 997         return;
 998     }
 999
1000     int first;
1001     GetViewStart(0, &first);
1002     if ( first > n )
1003     {
1004         // we need to scroll upwards, so make the current item appear on top
1005         // of the shown range
1006         Scroll(0, n);
1007     }
1008     else
1009     {
1010         int last = first + GetClientSize().y / GetLineHeight() - 1;
1011         if ( last < n )
1012         {
1013             // scroll down: the current item appears at the bottom of the
1014             // range
1015             Scroll(0, n - (last - first));
1016         }
1017     }
1018 }
1019
1020 void wxListBox::ChangeCurrent(int diff)
1021 {
1022     int current = m_current == -1 ? 0 : m_current;
1023
1024     current += diff;
1025
1026     int last = GetCount() - 1;
1027     if ( current < 0 )
1028         current = 0;
1029     else if ( current > last )
1030         current = last;
1031
1032     SetCurrentItem(current);
1033 }
1034
1035 void wxListBox::ExtendSelection(int itemTo)
1036 {
1037     // if we don't have the explicit values for selection start/end, make them
1038     // up
1039     if ( m_selAnchor == -1 )
1040         m_selAnchor = m_current;
1041
1042     if ( itemTo == -1 )
1043         itemTo = m_current;
1044
1045     // swap the start/end of selection range if necessary
1046     int itemFrom = m_selAnchor;
1047     if ( itemFrom > itemTo )
1048     {
1049         int itemTmp = itemFrom;
1050         itemFrom = itemTo;
1051         itemTo = itemTmp;
1052     }
1053
1054     // the selection should now include all items in the range between the
1055     // anchor and the specified item and only them
1056
1057     int n;
1058     for ( n = 0; n < itemFrom; n++ )
1059     {
1060         Deselect(n);
1061     }
1062
1063     for ( ; n <= itemTo; n++ )
1064     {
1065         SetSelection(n);
1066     }
1067
1068     unsigned int count = GetCount();
1069     for ( ; n < (int)count; n++ )
1070     {
1071         Deselect(n);
1072     }
1073 }
1074
1075 void wxListBox::DoSelect(int item, bool sel)
1076 {
1077     if ( item != -1 )
1078     {
1079         // go to this item first
1080         SetCurrentItem(item);
1081     }
1082
1083     // the current item is the one we want to change: either it was just
1084     // changed above to be the same as item or item == -1 in which we case we
1085     // are supposed to use the current one anyhow
1086     if ( m_current != -1 )
1087     {
1088         // [de]select it
1089         SetSelection(m_current, sel);
1090     }
1091 }
1092
1093 void wxListBox::SelectAndNotify(int item)
1094 {
1095     DoSelect(item);
1096
1097     SendEvent(wxEVT_COMMAND_LISTBOX_SELECTED);
1098 }
1099
1100 void wxListBox::Activate(int item)
1101 {
1102     if ( item != -1 )
1103         SetCurrentItem(item);
1104     else
1105         item = m_current;
1106
1107     if ( !(GetWindowStyle() & wxLB_MULTIPLE) )
1108     {
1109         DeselectAll(item);
1110     }
1111
1112     if ( item != -1 )
1113     {
1114         DoSelect(item);
1115
1116         SendEvent(wxEVT_COMMAND_LISTBOX_DOUBLECLICKED);
1117     }
1118 }
1119
1120 // ----------------------------------------------------------------------------
1121 // input handling
1122 // ----------------------------------------------------------------------------
1123
1124 /*
1125    The numArg here is the listbox item index while the strArg is used
1126    differently for the different actions:
1127
1128    a) for wxACTION_LISTBOX_FIND it has the natural meaning: this is the string
1129       to find
1130
1131    b) for wxACTION_LISTBOX_SELECT and wxACTION_LISTBOX_EXTENDSEL it is used
1132       to decide if the listbox should send the notification event (it is empty)
1133       or not (it is not): this allows us to reuse the same action for when the
1134       user is dragging the mouse when it has been released although in the
1135       first case no notification is sent while in the second it is sent.
1136  */
1137 bool wxListBox::PerformAction(const wxControlAction& action,
1138                               long numArg,
1139                               const wxString& strArg)
1140 {
1141     int item = (int)numArg;
1142
1143     if ( action == wxACTION_LISTBOX_SETFOCUS )
1144     {
1145         SetCurrentItem(item);
1146     }
1147     else if ( action == wxACTION_LISTBOX_ACTIVATE )
1148     {
1149         Activate(item);
1150     }
1151     else if ( action == wxACTION_LISTBOX_TOGGLE )
1152     {
1153         if ( item == -1 )
1154             item = m_current;
1155
1156         if ( IsSelected(item) )
1157             DoUnselect(item);
1158         else
1159             SelectAndNotify(item);
1160     }
1161     else if ( action == wxACTION_LISTBOX_SELECT )
1162     {
1163         DeselectAll(item);
1164
1165         if ( strArg.empty() )
1166             SelectAndNotify(item);
1167         else
1168             DoSelect(item);
1169     }
1170     else if ( action == wxACTION_LISTBOX_SELECTADD )
1171         DoSelect(item);
1172     else if ( action == wxACTION_LISTBOX_UNSELECT )
1173         DoUnselect(item);
1174     else if ( action == wxACTION_LISTBOX_MOVEDOWN )
1175         ChangeCurrent(1);
1176     else if ( action == wxACTION_LISTBOX_MOVEUP )
1177         ChangeCurrent(-1);
1178     else if ( action == wxACTION_LISTBOX_PAGEDOWN )
1179         ChangeCurrent(GetItemsPerPage());
1180     else if ( action == wxACTION_LISTBOX_PAGEUP )
1181         ChangeCurrent(-GetItemsPerPage());
1182     else if ( action == wxACTION_LISTBOX_START )
1183         SetCurrentItem(0);
1184     else if ( action == wxACTION_LISTBOX_END )
1185         SetCurrentItem(GetCount() - 1);
1186     else if ( action == wxACTION_LISTBOX_UNSELECTALL )
1187         DeselectAll(item);
1188     else if ( action == wxACTION_LISTBOX_EXTENDSEL )
1189         ExtendSelection(item);
1190     else if ( action == wxACTION_LISTBOX_FIND )
1191         FindNextItem(strArg);
1192     else if ( action == wxACTION_LISTBOX_ANCHOR )
1193         AnchorSelection(item == -1 ? m_current : item);
1194     else if ( action == wxACTION_LISTBOX_SELECTALL ||
1195               action == wxACTION_LISTBOX_SELTOGGLE )
1196         wxFAIL_MSG(_T("unimplemented yet"));
1197     else
1198         return wxControl::PerformAction(action, numArg, strArg);
1199
1200     return true;
1201 }
1202
1203 /* static */
1204 wxInputHandler *wxListBox::GetStdInputHandler(wxInputHandler *handlerDef)
1205 {
1206     static wxStdListboxInputHandler s_handler(handlerDef);
1207
1208     return &s_handler;
1209 }
1210
1211 // ============================================================================
1212 // implementation of wxStdListboxInputHandler
1213 // ============================================================================
1214
1215 wxStdListboxInputHandler::wxStdListboxInputHandler(wxInputHandler *handler,
1216                                                    bool toggleOnPressAlways)
1217                         : wxStdInputHandler(handler)
1218 {
1219     m_btnCapture = 0;
1220     m_toggleOnPressAlways = toggleOnPressAlways;
1221     m_actionMouse = wxACTION_NONE;
1222     m_trackMouseOutside = true;
1223 }
1224
1225 int wxStdListboxInputHandler::HitTest(const wxListBox *lbox,
1226                                       const wxMouseEvent& event)
1227 {
1228     int item = HitTestUnsafe(lbox, event);
1229
1230     return FixItemIndex(lbox, item);
1231 }
1232
1233 int wxStdListboxInputHandler::HitTestUnsafe(const wxListBox *lbox,
1234                                             const wxMouseEvent& event)
1235 {
1236     wxPoint pt = event.GetPosition();
1237     pt -= lbox->GetClientAreaOrigin();
1238     int y;
1239     lbox->CalcUnscrolledPosition(0, pt.y, NULL, &y);
1240     return y / lbox->GetLineHeight();
1241 }
1242
1243 int wxStdListboxInputHandler::FixItemIndex(const wxListBox *lbox,
1244                                            int item)
1245 {
1246     if ( item < 0 )
1247     {
1248         // mouse is above the first item
1249         item = 0;
1250     }
1251     else if ( (unsigned int)item >= lbox->GetCount() )
1252     {
1253         // mouse is below the last item
1254         item = lbox->GetCount() - 1;
1255     }
1256
1257     return item;
1258 }
1259
1260 bool wxStdListboxInputHandler::IsValidIndex(const wxListBox *lbox, int item)
1261 {
1262     return item >= 0 && (unsigned int)item < lbox->GetCount();
1263 }
1264
1265 wxControlAction
1266 wxStdListboxInputHandler::SetupCapture(wxListBox *lbox,
1267                                        const wxMouseEvent& event,
1268                                        int item)
1269 {
1270     // we currently only allow selecting with the left mouse button, if we
1271     // do need to allow using other buttons too we might use the code
1272     // inside #if 0
1273 #if 0
1274     m_btnCapture = event.LeftDown()
1275                     ? 1
1276                     : event.RightDown()
1277                         ? 3
1278                         : 2;
1279 #else
1280     m_btnCapture = 1;
1281 #endif // 0/1
1282
1283     wxControlAction action;
1284     if ( lbox->HasMultipleSelection() )
1285     {
1286         if ( lbox->GetWindowStyle() & wxLB_MULTIPLE )
1287         {
1288             if ( m_toggleOnPressAlways )
1289             {
1290                 // toggle the item right now
1291                 action = wxACTION_LISTBOX_TOGGLE;
1292             }
1293             //else: later
1294
1295             m_actionMouse = wxACTION_LISTBOX_SETFOCUS;
1296         }
1297         else // wxLB_EXTENDED listbox
1298         {
1299             // simple click in an extended sel listbox clears the old
1300             // selection and adds the clicked item to it then, ctrl-click
1301             // toggles an item to it and shift-click adds a range between
1302             // the old selection anchor and the clicked item
1303             if ( event.ControlDown() )
1304             {
1305                 lbox->PerformAction(wxACTION_LISTBOX_ANCHOR, item);
1306
1307                 action = wxACTION_LISTBOX_TOGGLE;
1308             }
1309             else if ( event.ShiftDown() )
1310             {
1311                 action = wxACTION_LISTBOX_EXTENDSEL;
1312             }
1313             else // simple click
1314             {
1315                 lbox->PerformAction(wxACTION_LISTBOX_ANCHOR, item);
1316
1317                 action = wxACTION_LISTBOX_SELECT;
1318             }
1319
1320             m_actionMouse = wxACTION_LISTBOX_EXTENDSEL;
1321         }
1322     }
1323     else // single selection
1324     {
1325         m_actionMouse =
1326         action = wxACTION_LISTBOX_SELECT;
1327     }
1328
1329     // by default we always do track it
1330     m_trackMouseOutside = true;
1331
1332     return action;
1333 }
1334
1335 bool wxStdListboxInputHandler::HandleKey(wxInputConsumer *consumer,
1336                                          const wxKeyEvent& event,
1337                                          bool pressed)
1338 {
1339     // we're only interested in the key press events
1340     if ( pressed && !event.AltDown() )
1341     {
1342         bool isMoveCmd = true;
1343         int style = consumer->GetInputWindow()->GetWindowStyle();
1344
1345         wxControlAction action;
1346         wxString strArg;
1347
1348         int keycode = event.GetKeyCode();
1349         switch ( keycode )
1350         {
1351             // movement
1352             case WXK_UP:
1353                 action = wxACTION_LISTBOX_MOVEUP;
1354                 break;
1355
1356             case WXK_DOWN:
1357                 action = wxACTION_LISTBOX_MOVEDOWN;
1358                 break;
1359
1360             case WXK_PAGEUP:
1361                 action = wxACTION_LISTBOX_PAGEUP;
1362                 break;
1363
1364             case WXK_PAGEDOWN:
1365                 action = wxACTION_LISTBOX_PAGEDOWN;
1366                 break;
1367
1368             case WXK_HOME:
1369                 action = wxACTION_LISTBOX_START;
1370                 break;
1371
1372             case WXK_END:
1373                 action = wxACTION_LISTBOX_END;
1374                 break;
1375
1376             // selection
1377             case WXK_SPACE:
1378                 if ( style & wxLB_MULTIPLE )
1379                 {
1380                     action = wxACTION_LISTBOX_TOGGLE;
1381                     isMoveCmd = false;
1382                 }
1383                 break;
1384
1385             case WXK_RETURN:
1386                 action = wxACTION_LISTBOX_ACTIVATE;
1387                 isMoveCmd = false;
1388                 break;
1389
1390             default:
1391                 if ( (keycode < 255) && wxIsalnum((wxChar)keycode) )
1392                 {
1393                     action = wxACTION_LISTBOX_FIND;
1394                     strArg = (wxChar)keycode;
1395                 }
1396         }
1397
1398         if ( !action.IsEmpty() )
1399         {
1400             consumer->PerformAction(action, -1, strArg);
1401
1402             if ( isMoveCmd )
1403             {
1404                 if ( style & wxLB_SINGLE )
1405                 {
1406                     // the current item is always the one selected
1407                     consumer->PerformAction(wxACTION_LISTBOX_SELECT);
1408                 }
1409                 else if ( style & wxLB_EXTENDED )
1410                 {
1411                     if ( event.ShiftDown() )
1412                         consumer->PerformAction(wxACTION_LISTBOX_EXTENDSEL);
1413                     else
1414                     {
1415                         // select the item and make it the new selection anchor
1416                         consumer->PerformAction(wxACTION_LISTBOX_SELECT);
1417                         consumer->PerformAction(wxACTION_LISTBOX_ANCHOR);
1418                     }
1419                 }
1420                 //else: nothing to do for multiple selection listboxes
1421             }
1422
1423             return true;
1424         }
1425     }
1426
1427     return wxStdInputHandler::HandleKey(consumer, event, pressed);
1428 }
1429
1430 bool wxStdListboxInputHandler::HandleMouse(wxInputConsumer *consumer,
1431                                            const wxMouseEvent& event)
1432 {
1433     wxListBox *lbox = wxStaticCast(consumer->GetInputWindow(), wxListBox);
1434     int item = HitTest(lbox, event);
1435     wxControlAction action;
1436
1437     // when the left mouse button is pressed, capture the mouse and track the
1438     // item under mouse (if the mouse leaves the window, we will still be
1439     // getting the mouse move messages generated by wxScrollWindow)
1440     if ( event.LeftDown() )
1441     {
1442         // capture the mouse to track the selected item
1443         lbox->CaptureMouse();
1444
1445         action = SetupCapture(lbox, event, item);
1446     }
1447     else if ( m_btnCapture && event.ButtonUp(m_btnCapture) )
1448     {
1449         // when the left mouse button is released, release the mouse too
1450         wxWindow *winCapture = wxWindow::GetCapture();
1451         if ( winCapture )
1452         {
1453             winCapture->ReleaseMouse();
1454             m_btnCapture = 0;
1455
1456             action = m_actionMouse;
1457         }
1458         //else: the mouse wasn't presed over the listbox, only released here
1459     }
1460     else if ( event.LeftDClick() )
1461     {
1462         action = wxACTION_LISTBOX_ACTIVATE;
1463     }
1464
1465     if ( !action.IsEmpty() )
1466     {
1467         lbox->PerformAction(action, item);
1468
1469         return true;
1470     }
1471
1472     return wxStdInputHandler::HandleMouse(consumer, event);
1473 }
1474
1475 bool wxStdListboxInputHandler::HandleMouseMove(wxInputConsumer *consumer,
1476                                                const wxMouseEvent& event)
1477 {
1478     wxWindow *winCapture = wxWindow::GetCapture();
1479     if ( winCapture && (event.GetEventObject() == winCapture) )
1480     {
1481         wxListBox *lbox = wxStaticCast(consumer->GetInputWindow(), wxListBox);
1482
1483         if ( !m_btnCapture || !m_trackMouseOutside )
1484         {
1485             // someone captured the mouse for us (we always set m_btnCapture
1486             // when we do it ourselves): in this case we only react to
1487             // the mouse messages when they happen inside the listbox
1488             if ( lbox->HitTest(event.GetPosition()) != wxHT_WINDOW_INSIDE )
1489                 return false;
1490         }
1491
1492         int item = HitTest(lbox, event);
1493         if ( !m_btnCapture )
1494         {
1495             // now that we have the mouse inside the listbox, do capture it
1496             // normally - but ensure that we will still ignore the outside
1497             // events
1498             SetupCapture(lbox, event, item);
1499
1500             m_trackMouseOutside = false;
1501         }
1502
1503         if ( IsValidIndex(lbox, item) )
1504         {
1505             // pass something into strArg to tell the listbox that it shouldn't
1506             // send the notification message: see PerformAction() above
1507             lbox->PerformAction(m_actionMouse, item, _T("no"));
1508         }
1509         // else: don't pass invalid index to the listbox
1510     }
1511     else // we don't have capture any more
1512     {
1513         if ( m_btnCapture )
1514         {
1515             // if we lost capture unexpectedly (someone else took the capture
1516             // from us), return to a consistent state
1517             m_btnCapture = 0;
1518         }
1519     }
1520
1521     return wxStdInputHandler::HandleMouseMove(consumer, event);
1522 }
1523
1524 #endif // wxUSE_LISTBOX