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 #ifndef __TWIN32__
  47     #ifdef __GNUWIN32_OLD__
  48         #include "wx/msw/gnuwin32/extra.h"
  49     #endif
  50 #endif
  51
  52 IMPLEMENT_DYNAMIC_CLASS(wxListBox, wxControl)
  53
  54 // ============================================================================
  55 // list box item declaration and implementation
  56 // ============================================================================
  57
  58 #if wxUSE_OWNER_DRAWN
  59
  60 class wxListBoxItem : public wxOwnerDrawn
  61 {
  62 public:
  63     wxListBoxItem(const wxString& str = wxEmptyString);
  64 };
  65
  66 wxListBoxItem::wxListBoxItem(const wxString& str) : wxOwnerDrawn(str, FALSE)
  67 {
  68     // no bitmaps/checkmarks
  69     SetMarginWidth(0);
  70 }
  71
  72 wxOwnerDrawn *wxListBox::CreateLboxItem(size_t WXUNUSED(n))
  73 {
  74     return new wxListBoxItem();
  75 }
  76
  77 #endif  //USE_OWNER_DRAWN
  78
  79 // ============================================================================
  80 // list box control implementation
  81 // ============================================================================
  82
  83 // ----------------------------------------------------------------------------
  84 // creation
  85 // ----------------------------------------------------------------------------
  86
  87 // Listbox item
  88 wxListBox::wxListBox()
  89 {
  90     m_noItems = 0;
  91     m_selected = 0;
  92 }
  93
  94 bool wxListBox::Create(wxWindow *parent,
  95                        wxWindowID id,
  96                        const wxPoint& pos,
  97                        const wxSize& size,
  98                        int n, const wxString choices[],
  99                        long style,
 100                        const wxValidator& validator,
 101                        const wxString& name)
 102 {
 103     m_noItems = 0;
 104     m_hWnd = 0;
 105     m_selected = 0;
 106
 107     SetName(name);
 108 #if wxUSE_VALIDATORS
 109     SetValidator(validator);
 110 #endif // wxUSE_VALIDATORS
 111
 112     if (parent)
 113         parent->AddChild(this);
 114
 115     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 116     SetForegroundColour(parent->GetForegroundColour());
 117
 118     m_windowId = ( id == -1 ) ? (int)NewControlId() : id;
 119
 120     int x = pos.x;
 121     int y = pos.y;
 122     int width = size.x;
 123     int height = size.y;
 124     m_windowStyle = style;
 125
 126     DWORD wstyle = WS_VISIBLE | WS_CHILD | WS_VSCROLL | WS_TABSTOP |
 127                    LBS_NOTIFY | LBS_HASSTRINGS ;
 128
 129     wxASSERT_MSG( !(style & wxLB_MULTIPLE) || !(style & wxLB_EXTENDED),
 130                   _T("only one of listbox selection modes can be specified") );
 131
 132     if ( (m_windowStyle & wxBORDER_MASK) == wxBORDER_DEFAULT )
 133         m_windowStyle |= wxBORDER_SUNKEN;
 134
 135     if ( m_windowStyle & wxCLIP_SIBLINGS )
 136         wstyle |= WS_CLIPSIBLINGS;
 137
 138     if (m_windowStyle & wxLB_MULTIPLE)
 139         wstyle |= LBS_MULTIPLESEL;
 140     else if (m_windowStyle & wxLB_EXTENDED)
 141         wstyle |= LBS_EXTENDEDSEL;
 142
 143     if (m_windowStyle & wxLB_ALWAYS_SB)
 144         wstyle |= LBS_DISABLENOSCROLL;
 145     if (m_windowStyle & wxLB_HSCROLL)
 146         wstyle |= WS_HSCROLL;
 147     if (m_windowStyle & wxLB_SORT)
 148         wstyle |= LBS_SORT;
 149
 150 #if wxUSE_OWNER_DRAWN
 151     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 152         // we don't support LBS_OWNERDRAWVARIABLE yet
 153         wstyle |= LBS_OWNERDRAWFIXED;
 154     }
 155 #endif
 156
 157     // Without this style, you get unexpected heights, so e.g. constraint layout
 158     // doesn't work properly
 159     wstyle |= LBS_NOINTEGRALHEIGHT;
 160
 161     WXDWORD exStyle = 0;
 162     (void) MSWGetStyle(style, & exStyle) ;
 163
 164     m_hWnd = (WXHWND)::CreateWindowEx(exStyle, wxT("LISTBOX"), NULL,
 165             wstyle ,
 166             0, 0, 0, 0,
 167             (HWND)parent->GetHWND(), (HMENU)m_windowId,
 168             wxGetInstance(), NULL);
 169
 170     wxCHECK_MSG( m_hWnd, FALSE, wxT("Failed to create listbox") );
 171
 172     // Subclass again to catch messages
 173     SubclassWin(m_hWnd);
 174
 175     size_t ui;
 176     for (ui = 0; ui < (size_t)n; ui++) {
 177         Append(choices[ui]);
 178     }
 179
 180     if ( (m_windowStyle & wxLB_MULTIPLE) == 0 )
 181         SendMessage(GetHwnd(), LB_SETCURSEL, 0, 0);
 182
 183     SetFont(parent->GetFont());
 184
 185     SetSize(x, y, width, height);
 186
 187     return TRUE;
 188 }
 189
 190 wxListBox::~wxListBox()
 191 {
 192     Free();
 193 }
 194
 195 void wxListBox::SetupColours()
 196 {
 197     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 198     SetForegroundColour(GetParent()->GetForegroundColour());
 199 }
 200
 201 // ----------------------------------------------------------------------------
 202 // implementation of wxListBoxBase methods
 203 // ----------------------------------------------------------------------------
 204
 205 void wxListBox::DoSetFirstItem(int N)
 206 {
 207     wxCHECK_RET( N >= 0 && N < m_noItems,
 208                  wxT("invalid index in wxListBox::SetFirstItem") );
 209
 210     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 211 }
 212
 213 void wxListBox::Delete(int N)
 214 {
 215     wxCHECK_RET( N >= 0 && N < m_noItems,
 216                  wxT("invalid index in wxListBox::Delete") );
 217
 218     // for owner drawn objects, the data is used for storing wxOwnerDrawn
 219     // pointers and we shouldn't touch it
 220 #if !wxUSE_OWNER_DRAWN
 221     if ( !(m_windowStyle & wxLB_OWNERDRAW) )
 222 #endif // !wxUSE_OWNER_DRAWN
 223         if ( HasClientObjectData() )
 224         {
 225             delete GetClientObject(N);
 226         }
 227
 228     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 229     m_noItems--;
 230
 231     SetHorizontalExtent(wxEmptyString);
 232 }
 233
 234 int wxListBox::DoAppend(const wxString& item)
 235 {
 236     int index = ListBox_AddString(GetHwnd(), item);
 237     m_noItems++;
 238
 239 #if wxUSE_OWNER_DRAWN
 240     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 241         wxOwnerDrawn *pNewItem = CreateLboxItem(index); // dummy argument
 242         pNewItem->SetName(item);
 243         m_aItems.Insert(pNewItem, index);
 244         ListBox_SetItemData(GetHwnd(), index, pNewItem);
 245         pNewItem->SetFont(GetFont());
 246     }
 247 #endif // wxUSE_OWNER_DRAWN
 248
 249     SetHorizontalExtent(item);
 250
 251     return index;
 252 }
 253
 254 void wxListBox::DoSetItems(const wxArrayString& choices, void** clientData)
 255 {
 256     // avoid flicker - but don't need to do this for a hidden listbox
 257     bool hideAndShow = IsShown();
 258     if ( hideAndShow )
 259     {
 260         ShowWindow(GetHwnd(), SW_HIDE);
 261     }
 262
 263     ListBox_ResetContent(GetHwnd());
 264
 265     m_noItems = choices.GetCount();
 266     int i;
 267     for (i = 0; i < m_noItems; i++)
 268     {
 269         ListBox_AddString(GetHwnd(), choices[i]);
 270         if ( clientData )
 271         {
 272             SetClientData(i, clientData[i]);
 273         }
 274     }
 275
 276 #if wxUSE_OWNER_DRAWN
 277     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 278         // first delete old items
 279         WX_CLEAR_ARRAY(m_aItems);
 280
 281         // then create new ones
 282         for ( size_t ui = 0; ui < (size_t)m_noItems; ui++ ) {
 283             wxOwnerDrawn *pNewItem = CreateLboxItem(ui);
 284             pNewItem->SetName(choices[ui]);
 285             m_aItems.Add(pNewItem);
 286             ListBox_SetItemData(GetHwnd(), ui, pNewItem);
 287         }
 288     }
 289 #endif // wxUSE_OWNER_DRAWN
 290
 291     SetHorizontalExtent();
 292
 293     if ( hideAndShow )
 294     {
 295         // show the listbox back if we hid it
 296         ShowWindow(GetHwnd(), SW_SHOW);
 297     }
 298 }
 299
 300 int wxListBox::FindString(const wxString& s) const
 301 {
 302     int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
 303     if (pos == LB_ERR)
 304         return wxNOT_FOUND;
 305     else
 306         return pos;
 307 }
 308
 309 void wxListBox::Clear()
 310 {
 311     Free();
 312
 313     ListBox_ResetContent(GetHwnd());
 314
 315     m_noItems = 0;
 316     SetHorizontalExtent();
 317 }
 318
 319 void wxListBox::Free()
 320 {
 321 #if wxUSE_OWNER_DRAWN
 322     if ( m_windowStyle & wxLB_OWNERDRAW )
 323     {
 324         WX_CLEAR_ARRAY(m_aItems);
 325     }
 326     else
 327 #endif // wxUSE_OWNER_DRAWN
 328     if ( HasClientObjectData() )
 329     {
 330         for ( size_t n = 0; n < (size_t)m_noItems; n++ )
 331         {
 332             delete GetClientObject(n);
 333         }
 334     }
 335 }
 336
 337 void wxListBox::SetSelection(int N, bool select)
 338 {
 339     wxCHECK_RET( N >= 0 && N < m_noItems,
 340                  wxT("invalid index in wxListBox::SetSelection") );
 341
 342     if ( HasMultipleSelection() )
 343     {
 344         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 345     }
 346     else
 347     {
 348         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 349     }
 350 }
 351
 352 bool wxListBox::IsSelected(int N) const
 353 {
 354     wxCHECK_MSG( N >= 0 && N < m_noItems, FALSE,
 355                  wxT("invalid index in wxListBox::Selected") );
 356
 357     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? FALSE : TRUE;
 358 }
 359
 360 wxClientData* wxListBox::DoGetItemClientObject(int n) const
 361 {
 362     return (wxClientData *)DoGetItemClientData(n);
 363 }
 364
 365 void *wxListBox::DoGetItemClientData(int n) const
 366 {
 367     wxCHECK_MSG( n >= 0 && n < m_noItems, NULL,
 368                  wxT("invalid index in wxListBox::GetClientData") );
 369
 370     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 371 }
 372
 373 void wxListBox::DoSetItemClientObject(int n, wxClientData* clientData)
 374 {
 375     DoSetItemClientData(n, clientData);
 376 }
 377
 378 void wxListBox::DoSetItemClientData(int n, void *clientData)
 379 {
 380     wxCHECK_RET( n >= 0 && n < m_noItems,
 381                  wxT("invalid index in wxListBox::SetClientData") );
 382
 383 #if wxUSE_OWNER_DRAWN
 384     if ( m_windowStyle & wxLB_OWNERDRAW )
 385     {
 386         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 387         // in OnMeasure/OnDraw.
 388         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 389     }
 390 #endif // wxUSE_OWNER_DRAWN
 391
 392     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 393         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 394 }
 395
 396 // Return number of selections and an array of selected integers
 397 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 398 {
 399     aSelections.Empty();
 400
 401     if ( HasMultipleSelection() )
 402     {
 403         int countSel = ListBox_GetSelCount(GetHwnd());
 404         if ( countSel == LB_ERR )
 405         {
 406             wxLogDebug(_T("ListBox_GetSelCount failed"));
 407         }
 408         else if ( countSel != 0 )
 409         {
 410             int *selections = new int[countSel];
 411
 412             if ( ListBox_GetSelItems(GetHwnd(),
 413                                      countSel, selections) == LB_ERR )
 414             {
 415                 wxLogDebug(wxT("ListBox_GetSelItems failed"));
 416                 countSel = -1;
 417             }
 418             else
 419             {
 420                 aSelections.Alloc(countSel);
 421                 for ( int n = 0; n < countSel; n++ )
 422                     aSelections.Add(selections[n]);
 423             }
 424
 425             delete [] selections;
 426         }
 427
 428         return countSel;
 429     }
 430     else  // single-selection listbox
 431     {
 432         if (ListBox_GetCurSel(GetHwnd()) > -1)
 433             aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 434
 435         return aSelections.Count();
 436     }
 437 }
 438
 439 // Get single selection, for single choice list items
 440 int wxListBox::GetSelection() const
 441 {
 442     wxCHECK_MSG( !HasMultipleSelection(),
 443                  -1,
 444                  wxT("GetSelection() can't be used with multiple-selection listboxes, use GetSelections() instead.") );
 445
 446     return ListBox_GetCurSel(GetHwnd());
 447 }
 448
 449 // Find string for position
 450 wxString wxListBox::GetString(int N) const
 451 {
 452     wxCHECK_MSG( N >= 0 && N < m_noItems, wxEmptyString,
 453                  wxT("invalid index in wxListBox::GetClientData") );
 454
 455     int len = ListBox_GetTextLen(GetHwnd(), N);
 456
 457     // +1 for terminating NUL
 458     wxString result;
 459     ListBox_GetText(GetHwnd(), N, result.GetWriteBuf(len + 1));
 460     result.UngetWriteBuf();
 461
 462     return result;
 463 }
 464
 465 void
 466 wxListBox::DoInsertItems(const wxArrayString& items, int pos)
 467 {
 468     wxCHECK_RET( pos >= 0 && pos <= m_noItems,
 469                  wxT("invalid index in wxListBox::InsertItems") );
 470
 471     int nItems = items.GetCount();
 472     for ( int i = 0; i < nItems; i++ )
 473     {
 474         int idx = ListBox_InsertString(GetHwnd(), i + pos, items[i]);
 475
 476 #if wxUSE_OWNER_DRAWN
 477         if ( m_windowStyle & wxLB_OWNERDRAW )
 478         {
 479             wxOwnerDrawn *pNewItem = CreateLboxItem(idx);
 480             pNewItem->SetName(items[i]);
 481             pNewItem->SetFont(GetFont());
 482             m_aItems.Insert(pNewItem, idx);
 483
 484             ListBox_SetItemData(GetHwnd(), idx, pNewItem);
 485         }
 486 #endif // wxUSE_OWNER_DRAWN
 487     }
 488
 489     m_noItems += nItems;
 490
 491     SetHorizontalExtent();
 492 }
 493
 494 void wxListBox::SetString(int N, const wxString& s)
 495 {
 496     wxCHECK_RET( N >= 0 && N < m_noItems,
 497                  wxT("invalid index in wxListBox::SetString") );
 498
 499     // remember the state of the item
 500     bool wasSelected = IsSelected(N);
 501
 502     void *oldData = NULL;
 503     wxClientData *oldObjData = NULL;
 504     if ( m_clientDataItemsType == wxClientData_Void )
 505         oldData = GetClientData(N);
 506     else if ( m_clientDataItemsType == wxClientData_Object )
 507         oldObjData = GetClientObject(N);
 508
 509     // delete and recreate it
 510     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 511
 512     int newN = N;
 513     if ( N == m_noItems - 1 )
 514         newN = -1;
 515
 516     ListBox_InsertString(GetHwnd(), newN, s);
 517
 518     // restore the client data
 519     if ( oldData )
 520         SetClientData(N, oldData);
 521     else if ( oldObjData )
 522         SetClientObject(N, oldObjData);
 523
 524     // we may have lost the selection
 525     if ( wasSelected )
 526         Select(N);
 527
 528 #if wxUSE_OWNER_DRAWN
 529     if ( m_windowStyle & wxLB_OWNERDRAW )
 530     {
 531         // update item's text
 532         m_aItems[N]->SetName(s);
 533
 534         // reassign the item's data
 535         ListBox_SetItemData(GetHwnd(), N, m_aItems[N]);
 536     }
 537 #endif  //USE_OWNER_DRAWN
 538 }
 539
 540 int wxListBox::GetCount() const
 541 {
 542     return m_noItems;
 543 }
 544
 545 // ----------------------------------------------------------------------------
 546 // helpers
 547 // ----------------------------------------------------------------------------
 548
 549 // Windows-specific code to set the horizontal extent of the listbox, if
 550 // necessary. If s is non-NULL, it's used to calculate the horizontal extent.
 551 // Otherwise, all strings are used.
 552 void wxListBox::SetHorizontalExtent(const wxString& s)
 553 {
 554     // Only necessary if we want a horizontal scrollbar
 555     if (!(m_windowStyle & wxHSCROLL))
 556         return;
 557     TEXTMETRIC lpTextMetric;
 558
 559     if ( !s.IsEmpty() )
 560     {
 561         int existingExtent = (int)SendMessage(GetHwnd(), LB_GETHORIZONTALEXTENT, 0, 0L);
 562         HDC dc = GetWindowDC(GetHwnd());
 563         HFONT oldFont = 0;
 564         if (GetFont().Ok() && GetFont().GetResourceHandle())
 565             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 566
 567         GetTextMetrics(dc, &lpTextMetric);
 568         SIZE extentXY;
 569         ::GetTextExtentPoint(dc, (LPTSTR) (const wxChar *)s, s.Length(), &extentXY);
 570         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 571
 572         if (oldFont)
 573             ::SelectObject(dc, oldFont);
 574
 575         ReleaseDC(GetHwnd(), dc);
 576         if (extentX > existingExtent)
 577             SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(extentX), 0L);
 578     }
 579     else
 580     {
 581         int largestExtent = 0;
 582         HDC dc = GetWindowDC(GetHwnd());
 583         HFONT oldFont = 0;
 584         if (GetFont().Ok() && GetFont().GetResourceHandle())
 585             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 586
 587         GetTextMetrics(dc, &lpTextMetric);
 588         int i;
 589         for (i = 0; i < m_noItems; i++)
 590         {
 591             int len = (int)SendMessage(GetHwnd(), LB_GETTEXT, i, (LONG)wxBuffer);
 592             wxBuffer[len] = 0;
 593             SIZE extentXY;
 594             ::GetTextExtentPoint(dc, (LPTSTR)wxBuffer, 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