src/msw/listbox.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/listbox.cpp
   3 // Purpose:     wxListBox
   4 // Author:      Julian Smart
   5 // Modified by: Vadim Zeitlin (owner drawn stuff)
   6 // Created:
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13     #pragma implementation "listbox.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20     #pragma hdrstop
  21 #endif
  22
  23 #if wxUSE_LISTBOX
  24
  25 #ifndef WX_PRECOMP
  26 #include "wx/listbox.h"
  27 #include "wx/settings.h"
  28 #include "wx/brush.h"
  29 #include "wx/font.h"
  30 #include "wx/dc.h"
  31 #include "wx/utils.h"
  32 #endif
  33
  34 #include "wx/window.h"
  35 #include "wx/msw/private.h"
  36
  37 #include <windowsx.h>
  38
  39 #include "wx/dynarray.h"
  40 #include "wx/log.h"
  41
  42 #if wxUSE_OWNER_DRAWN
  43     #include  "wx/ownerdrw.h"
  44 #endif
  45
  46 #ifdef __GNUWIN32_OLD__
  47     #include "wx/msw/gnuwin32/extra.h"
  48 #endif
  49
  50 IMPLEMENT_DYNAMIC_CLASS(wxListBox, wxControl)
  51
  52 // ============================================================================
  53 // list box item declaration and implementation
  54 // ============================================================================
  55
  56 #if wxUSE_OWNER_DRAWN
  57
  58 class wxListBoxItem : public wxOwnerDrawn
  59 {
  60 public:
  61     wxListBoxItem(const wxString& str = wxEmptyString);
  62 };
  63
  64 wxListBoxItem::wxListBoxItem(const wxString& str) : wxOwnerDrawn(str, FALSE)
  65 {
  66     // no bitmaps/checkmarks
  67     SetMarginWidth(0);
  68 }
  69
  70 wxOwnerDrawn *wxListBox::CreateLboxItem(size_t WXUNUSED(n))
  71 {
  72     return new wxListBoxItem();
  73 }
  74
  75 #endif  //USE_OWNER_DRAWN
  76
  77 // ============================================================================
  78 // list box control implementation
  79 // ============================================================================
  80
  81 // ----------------------------------------------------------------------------
  82 // creation
  83 // ----------------------------------------------------------------------------
  84
  85 // Listbox item
  86 wxListBox::wxListBox()
  87 {
  88     m_noItems = 0;
  89     m_selected = 0;
  90 }
  91
  92 bool wxListBox::Create(wxWindow *parent,
  93                        wxWindowID id,
  94                        const wxPoint& pos,
  95                        const wxSize& size,
  96                        int n, const wxString choices[],
  97                        long style,
  98                        const wxValidator& validator,
  99                        const wxString& name)
 100 {
 101     m_noItems = 0;
 102     m_hWnd = 0;
 103     m_selected = 0;
 104
 105     SetName(name);
 106 #if wxUSE_VALIDATORS
 107     SetValidator(validator);
 108 #endif // wxUSE_VALIDATORS
 109
 110     if (parent)
 111         parent->AddChild(this);
 112
 113     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 114     SetForegroundColour(parent->GetForegroundColour());
 115
 116     m_windowId = ( id == -1 ) ? (int)NewControlId() : id;
 117
 118     int x = pos.x;
 119     int y = pos.y;
 120     int width = size.x;
 121     int height = size.y;
 122     m_windowStyle = style;
 123
 124     DWORD wstyle = WS_VISIBLE | WS_CHILD | WS_VSCROLL | WS_TABSTOP |
 125                    LBS_NOTIFY | LBS_HASSTRINGS ;
 126
 127     wxASSERT_MSG( !(style & wxLB_MULTIPLE) || !(style & wxLB_EXTENDED),
 128                   _T("only one of listbox selection modes can be specified") );
 129
 130     if ( (m_windowStyle & wxBORDER_MASK) == wxBORDER_DEFAULT )
 131         m_windowStyle |= wxBORDER_SUNKEN;
 132
 133     if ( m_windowStyle & wxCLIP_SIBLINGS )
 134         wstyle |= WS_CLIPSIBLINGS;
 135
 136     if (m_windowStyle & wxLB_MULTIPLE)
 137         wstyle |= LBS_MULTIPLESEL;
 138     else if (m_windowStyle & wxLB_EXTENDED)
 139         wstyle |= LBS_EXTENDEDSEL;
 140
 141     if (m_windowStyle & wxLB_ALWAYS_SB)
 142         wstyle |= LBS_DISABLENOSCROLL;
 143     if (m_windowStyle & wxLB_HSCROLL)
 144         wstyle |= WS_HSCROLL;
 145     if (m_windowStyle & wxLB_SORT)
 146         wstyle |= LBS_SORT;
 147
 148 #if wxUSE_OWNER_DRAWN
 149     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 150         // we don't support LBS_OWNERDRAWVARIABLE yet
 151         wstyle |= LBS_OWNERDRAWFIXED;
 152     }
 153 #endif
 154
 155     // Without this style, you get unexpected heights, so e.g. constraint layout
 156     // doesn't work properly
 157     wstyle |= LBS_NOINTEGRALHEIGHT;
 158
 159     WXDWORD exStyle = 0;
 160     (void) MSWGetStyle(m_windowStyle, & exStyle) ;
 161
 162     m_hWnd = (WXHWND)::CreateWindowEx(exStyle, wxT("LISTBOX"), NULL,
 163             wstyle ,
 164             0, 0, 0, 0,
 165             (HWND)parent->GetHWND(), (HMENU)m_windowId,
 166             wxGetInstance(), NULL);
 167
 168     wxCHECK_MSG( m_hWnd, FALSE, wxT("Failed to create listbox") );
 169
 170     // Subclass again to catch messages
 171     SubclassWin(m_hWnd);
 172
 173     size_t ui;
 174     for (ui = 0; ui < (size_t)n; ui++) {
 175         Append(choices[ui]);
 176     }
 177
 178     if ( (m_windowStyle & wxLB_MULTIPLE) == 0 )
 179         SendMessage(GetHwnd(), LB_SETCURSEL, 0, 0);
 180
 181     SetFont(parent->GetFont());
 182
 183     SetSize(x, y, width, height);
 184
 185     return TRUE;
 186 }
 187
 188 wxListBox::~wxListBox()
 189 {
 190     Free();
 191 }
 192
 193 void wxListBox::SetupColours()
 194 {
 195     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 196     SetForegroundColour(GetParent()->GetForegroundColour());
 197 }
 198
 199 // ----------------------------------------------------------------------------
 200 // implementation of wxListBoxBase methods
 201 // ----------------------------------------------------------------------------
 202
 203 void wxListBox::DoSetFirstItem(int N)
 204 {
 205     wxCHECK_RET( N >= 0 && N < m_noItems,
 206                  wxT("invalid index in wxListBox::SetFirstItem") );
 207
 208     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 209 }
 210
 211 void wxListBox::Delete(int N)
 212 {
 213     wxCHECK_RET( N >= 0 && N < m_noItems,
 214                  wxT("invalid index in wxListBox::Delete") );
 215
 216     // for owner drawn objects, the data is used for storing wxOwnerDrawn
 217     // pointers and we shouldn't touch it
 218 #if !wxUSE_OWNER_DRAWN
 219     if ( !(m_windowStyle & wxLB_OWNERDRAW) )
 220 #endif // !wxUSE_OWNER_DRAWN
 221         if ( HasClientObjectData() )
 222         {
 223             delete GetClientObject(N);
 224         }
 225
 226     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 227     m_noItems--;
 228
 229     SetHorizontalExtent(wxEmptyString);
 230 }
 231
 232 int wxListBox::DoAppend(const wxString& item)
 233 {
 234     int index = ListBox_AddString(GetHwnd(), item);
 235     m_noItems++;
 236
 237 #if wxUSE_OWNER_DRAWN
 238     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 239         wxOwnerDrawn *pNewItem = CreateLboxItem(index); // dummy argument
 240         pNewItem->SetName(item);
 241         m_aItems.Insert(pNewItem, index);
 242         ListBox_SetItemData(GetHwnd(), index, pNewItem);
 243         pNewItem->SetFont(GetFont());
 244     }
 245 #endif // wxUSE_OWNER_DRAWN
 246
 247     SetHorizontalExtent(item);
 248
 249     return index;
 250 }
 251
 252 void wxListBox::DoSetItems(const wxArrayString& choices, void** clientData)
 253 {
 254     // avoid flicker - but don't need to do this for a hidden listbox
 255     bool hideAndShow = IsShown();
 256     if ( hideAndShow )
 257     {
 258         ShowWindow(GetHwnd(), SW_HIDE);
 259     }
 260
 261     ListBox_ResetContent(GetHwnd());
 262
 263     m_noItems = choices.GetCount();
 264     int i;
 265     for (i = 0; i < m_noItems; i++)
 266     {
 267         ListBox_AddString(GetHwnd(), choices[i]);
 268         if ( clientData )
 269         {
 270             SetClientData(i, clientData[i]);
 271         }
 272     }
 273
 274 #if wxUSE_OWNER_DRAWN
 275     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 276         // first delete old items
 277         WX_CLEAR_ARRAY(m_aItems);
 278
 279         // then create new ones
 280         for ( size_t ui = 0; ui < (size_t)m_noItems; ui++ ) {
 281             wxOwnerDrawn *pNewItem = CreateLboxItem(ui);
 282             pNewItem->SetName(choices[ui]);
 283             m_aItems.Add(pNewItem);
 284             ListBox_SetItemData(GetHwnd(), ui, pNewItem);
 285         }
 286     }
 287 #endif // wxUSE_OWNER_DRAWN
 288
 289     SetHorizontalExtent();
 290
 291     if ( hideAndShow )
 292     {
 293         // show the listbox back if we hid it
 294         ShowWindow(GetHwnd(), SW_SHOW);
 295     }
 296 }
 297
 298 int wxListBox::FindString(const wxString& s) const
 299 {
 300     int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
 301     if (pos == LB_ERR)
 302         return wxNOT_FOUND;
 303     else
 304         return pos;
 305 }
 306
 307 void wxListBox::Clear()
 308 {
 309     Free();
 310
 311     ListBox_ResetContent(GetHwnd());
 312
 313     m_noItems = 0;
 314     SetHorizontalExtent();
 315 }
 316
 317 void wxListBox::Free()
 318 {
 319 #if wxUSE_OWNER_DRAWN
 320     if ( m_windowStyle & wxLB_OWNERDRAW )
 321     {
 322         WX_CLEAR_ARRAY(m_aItems);
 323     }
 324     else
 325 #endif // wxUSE_OWNER_DRAWN
 326     if ( HasClientObjectData() )
 327     {
 328         for ( size_t n = 0; n < (size_t)m_noItems; n++ )
 329         {
 330             delete GetClientObject(n);
 331         }
 332     }
 333 }
 334
 335 void wxListBox::SetSelection(int N, bool select)
 336 {
 337     wxCHECK_RET( N >= 0 && N < m_noItems,
 338                  wxT("invalid index in wxListBox::SetSelection") );
 339
 340     if ( HasMultipleSelection() )
 341     {
 342         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 343     }
 344     else
 345     {
 346         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 347     }
 348 }
 349
 350 bool wxListBox::IsSelected(int N) const
 351 {
 352     wxCHECK_MSG( N >= 0 && N < m_noItems, FALSE,
 353                  wxT("invalid index in wxListBox::Selected") );
 354
 355     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? FALSE : TRUE;
 356 }
 357
 358 wxClientData* wxListBox::DoGetItemClientObject(int n) const
 359 {
 360     return (wxClientData *)DoGetItemClientData(n);
 361 }
 362
 363 void *wxListBox::DoGetItemClientData(int n) const
 364 {
 365     wxCHECK_MSG( n >= 0 && n < m_noItems, NULL,
 366                  wxT("invalid index in wxListBox::GetClientData") );
 367
 368     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 369 }
 370
 371 void wxListBox::DoSetItemClientObject(int n, wxClientData* clientData)
 372 {
 373     DoSetItemClientData(n, clientData);
 374 }
 375
 376 void wxListBox::DoSetItemClientData(int n, void *clientData)
 377 {
 378     wxCHECK_RET( n >= 0 && n < m_noItems,
 379                  wxT("invalid index in wxListBox::SetClientData") );
 380
 381 #if wxUSE_OWNER_DRAWN
 382     if ( m_windowStyle & wxLB_OWNERDRAW )
 383     {
 384         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 385         // in OnMeasure/OnDraw.
 386         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 387     }
 388 #endif // wxUSE_OWNER_DRAWN
 389
 390     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 391         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 392 }
 393
 394 // Return number of selections and an array of selected integers
 395 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 396 {
 397     aSelections.Empty();
 398
 399     if ( HasMultipleSelection() )
 400     {
 401         int countSel = ListBox_GetSelCount(GetHwnd());
 402         if ( countSel == LB_ERR )
 403         {
 404             wxLogDebug(_T("ListBox_GetSelCount failed"));
 405         }
 406         else if ( countSel != 0 )
 407         {
 408             int *selections = new int[countSel];
 409
 410             if ( ListBox_GetSelItems(GetHwnd(),
 411                                      countSel, selections) == LB_ERR )
 412             {
 413                 wxLogDebug(wxT("ListBox_GetSelItems failed"));
 414                 countSel = -1;
 415             }
 416             else
 417             {
 418                 aSelections.Alloc(countSel);
 419                 for ( int n = 0; n < countSel; n++ )
 420                     aSelections.Add(selections[n]);
 421             }
 422
 423             delete [] selections;
 424         }
 425
 426         return countSel;
 427     }
 428     else  // single-selection listbox
 429     {
 430         if (ListBox_GetCurSel(GetHwnd()) > -1)
 431             aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 432
 433         return aSelections.Count();
 434     }
 435 }
 436
 437 // Get single selection, for single choice list items
 438 int wxListBox::GetSelection() const
 439 {
 440     wxCHECK_MSG( !HasMultipleSelection(),
 441                  -1,
 442                  wxT("GetSelection() can't be used with multiple-selection listboxes, use GetSelections() instead.") );
 443
 444     return ListBox_GetCurSel(GetHwnd());
 445 }
 446
 447 // Find string for position
 448 wxString wxListBox::GetString(int N) const
 449 {
 450     wxCHECK_MSG( N >= 0 && N < m_noItems, wxEmptyString,
 451                  wxT("invalid index in wxListBox::GetClientData") );
 452
 453     int len = ListBox_GetTextLen(GetHwnd(), N);
 454
 455     // +1 for terminating NUL
 456     wxString result;
 457     ListBox_GetText(GetHwnd(), N, result.GetWriteBuf(len + 1));
 458     result.UngetWriteBuf();
 459
 460     return result;
 461 }
 462
 463 void
 464 wxListBox::DoInsertItems(const wxArrayString& items, int pos)
 465 {
 466     wxCHECK_RET( pos >= 0 && pos <= m_noItems,
 467                  wxT("invalid index in wxListBox::InsertItems") );
 468
 469     int nItems = items.GetCount();
 470     for ( int i = 0; i < nItems; i++ )
 471     {
 472         int idx = ListBox_InsertString(GetHwnd(), i + pos, items[i]);
 473
 474 #if wxUSE_OWNER_DRAWN
 475         if ( m_windowStyle & wxLB_OWNERDRAW )
 476         {
 477             wxOwnerDrawn *pNewItem = CreateLboxItem(idx);
 478             pNewItem->SetName(items[i]);
 479             pNewItem->SetFont(GetFont());
 480             m_aItems.Insert(pNewItem, idx);
 481
 482             ListBox_SetItemData(GetHwnd(), idx, pNewItem);
 483         }
 484 #endif // wxUSE_OWNER_DRAWN
 485     }
 486
 487     m_noItems += nItems;
 488
 489     SetHorizontalExtent();
 490 }
 491
 492 void wxListBox::SetString(int N, const wxString& s)
 493 {
 494     wxCHECK_RET( N >= 0 && N < m_noItems,
 495                  wxT("invalid index in wxListBox::SetString") );
 496
 497     // remember the state of the item
 498     bool wasSelected = IsSelected(N);
 499
 500     void *oldData = NULL;
 501     wxClientData *oldObjData = NULL;
 502     if ( m_clientDataItemsType == wxClientData_Void )
 503         oldData = GetClientData(N);
 504     else if ( m_clientDataItemsType == wxClientData_Object )
 505         oldObjData = GetClientObject(N);
 506
 507     // delete and recreate it
 508     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 509
 510     int newN = N;
 511     if ( N == m_noItems - 1 )
 512         newN = -1;
 513
 514     ListBox_InsertString(GetHwnd(), newN, s);
 515
 516     // restore the client data
 517     if ( oldData )
 518         SetClientData(N, oldData);
 519     else if ( oldObjData )
 520         SetClientObject(N, oldObjData);
 521
 522     // we may have lost the selection
 523     if ( wasSelected )
 524         Select(N);
 525
 526 #if wxUSE_OWNER_DRAWN
 527     if ( m_windowStyle & wxLB_OWNERDRAW )
 528     {
 529         // update item's text
 530         m_aItems[N]->SetName(s);
 531
 532         // reassign the item's data
 533         ListBox_SetItemData(GetHwnd(), N, m_aItems[N]);
 534     }
 535 #endif  //USE_OWNER_DRAWN
 536 }
 537
 538 int wxListBox::GetCount() const
 539 {
 540     return m_noItems;
 541 }
 542
 543 // ----------------------------------------------------------------------------
 544 // helpers
 545 // ----------------------------------------------------------------------------
 546
 547 // Windows-specific code to set the horizontal extent of the listbox, if
 548 // necessary. If s is non-NULL, it's used to calculate the horizontal extent.
 549 // Otherwise, all strings are used.
 550 void wxListBox::SetHorizontalExtent(const wxString& s)
 551 {
 552     // Only necessary if we want a horizontal scrollbar
 553     if (!(m_windowStyle & wxHSCROLL))
 554         return;
 555     TEXTMETRIC lpTextMetric;
 556
 557     if ( !s.IsEmpty() )
 558     {
 559         int existingExtent = (int)SendMessage(GetHwnd(), LB_GETHORIZONTALEXTENT, 0, 0L);
 560         HDC dc = GetWindowDC(GetHwnd());
 561         HFONT oldFont = 0;
 562         if (GetFont().Ok() && GetFont().GetResourceHandle())
 563             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 564
 565         GetTextMetrics(dc, &lpTextMetric);
 566         SIZE extentXY;
 567         ::GetTextExtentPoint(dc, (LPTSTR) (const wxChar *)s, s.Length(), &extentXY);
 568         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 569
 570         if (oldFont)
 571             ::SelectObject(dc, oldFont);
 572
 573         ReleaseDC(GetHwnd(), dc);
 574         if (extentX > existingExtent)
 575             SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(extentX), 0L);
 576     }
 577     else
 578     {
 579         int largestExtent = 0;
 580         HDC dc = GetWindowDC(GetHwnd());
 581         HFONT oldFont = 0;
 582         if (GetFont().Ok() && GetFont().GetResourceHandle())
 583             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 584
 585         GetTextMetrics(dc, &lpTextMetric);
 586
 587         // FIXME: buffer overflow!!
 588         wxChar buf[1024];
 589         for (int i = 0; i < m_noItems; i++)
 590         {
 591             int len = (int)SendMessage(GetHwnd(), LB_GETTEXT, i, (LPARAM)buf);
 592             buf[len] = 0;
 593             SIZE extentXY;
 594             ::GetTextExtentPoint(dc, buf, len, &extentXY);
 595             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 596             if (extentX > largestExtent)
 597                 largestExtent = extentX;
 598         }
 599         if (oldFont)
 600             ::SelectObject(dc, oldFont);
 601
 602         ReleaseDC(GetHwnd(), dc);
 603         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 604     }
 605 }
 606
 607 wxSize wxListBox::DoGetBestSize() const
 608 {
 609     // find the widest string
 610     int wLine;
 611     int wListbox = 0;
 612     for ( int i = 0; i < m_noItems; i++ )
 613     {
 614         wxString str(GetString(i));
 615         GetTextExtent(str, &wLine, NULL);
 616         if ( wLine > wListbox )
 617             wListbox = wLine;
 618     }
 619
 620     // give it some reasonable default value if there are no strings in the
 621     // list
 622     if ( wListbox == 0 )
 623         wListbox = 100;
 624
 625     // the listbox should be slightly larger than the widest string
 626     int cx, cy;
 627     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 628
 629     wListbox += 3*cx;
 630
 631     // don't make the listbox too tall (limit height to 10 items) but don't
 632     // make it too small neither
 633     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*
 634                     wxMin(wxMax(m_noItems, 3), 10);
 635
 636     return wxSize(wListbox, hListbox);
 637 }
 638
 639 // ----------------------------------------------------------------------------
 640 // callbacks
 641 // ----------------------------------------------------------------------------
 642
 643 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 644 {
 645     wxEventType evtType;
 646     if ( param == LBN_SELCHANGE )
 647     {
 648         evtType = wxEVT_COMMAND_LISTBOX_SELECTED;
 649     }
 650     else if ( param == LBN_DBLCLK )
 651     {
 652         evtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;
 653     }
 654     else
 655     {
 656         // some event we're not interested in
 657         return FALSE;
 658     }
 659
 660     wxCommandEvent event(evtType, m_windowId);
 661     event.SetEventObject( this );
 662
 663     // retrieve the affected item
 664     int n = SendMessage(GetHwnd(), LB_GETCARETINDEX, 0, 0);
 665     if ( n != LB_ERR )
 666     {
 667         if ( HasClientObjectData() )
 668             event.SetClientObject( GetClientObject(n) );
 669         else if ( HasClientUntypedData() )
 670             event.SetClientData( GetClientData(n) );
 671
 672         event.SetString( GetString(n) );
 673         event.SetExtraLong( HasMultipleSelection() ? IsSelected(n) : TRUE );
 674     }
 675
 676     event.m_commandInt = n;
 677
 678     return GetEventHandler()->ProcessEvent(event);
 679 }
 680
 681 // ----------------------------------------------------------------------------
 682 // wxCheckListBox support
 683 // ----------------------------------------------------------------------------
 684
 685 #if wxUSE_OWNER_DRAWN
 686
 687 // drawing
 688 // -------
 689
 690 // space beneath/above each row in pixels
 691 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 692 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 693
 694 // the height is the same for all items
 695 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 696
 697 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 698 //     message is not yet sent when we get here!
 699 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 700 {
 701     // only owner-drawn control should receive this message
 702     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 703
 704     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 705
 706     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 707
 708     wxDC dc;
 709     dc.SetHDC((WXHDC)hdc);
 710     dc.SetFont(wxSystemSettings::GetFont(wxSYS_ANSI_VAR_FONT));
 711
 712     pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 713     pStruct->itemWidth  = dc.GetCharWidth();
 714
 715     dc.SetHDC(0);
 716
 717     DeleteDC(hdc);
 718
 719     return TRUE;
 720 }
 721
 722 // forward the message to the appropriate item
 723 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 724 {
 725     // only owner-drawn control should receive this message
 726     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 727
 728     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 729     UINT itemID = pStruct->itemID;
 730
 731     // the item may be -1 for an empty listbox
 732     if ( itemID == (UINT)-1 )
 733         return FALSE;
 734
 735     long data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 736
 737     wxCHECK( data && (data != LB_ERR), FALSE );
 738
 739     wxListBoxItem *pItem = (wxListBoxItem *)data;
 740
 741     wxDCTemp dc((WXHDC)pStruct->hDC);
 742     wxRect rect(wxPoint(pStruct->rcItem.left, pStruct->rcItem.top),
 743                 wxPoint(pStruct->rcItem.right, pStruct->rcItem.bottom));
 744
 745     return pItem->OnDrawItem(dc, rect,
 746                              (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 747                              (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 748 }
 749
 750 #endif // wxUSE_OWNER_DRAWN
 751
 752 #endif // wxUSE_LISTBOX