src/msw/listbox.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 license
  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 #include "wx/window.h"
  24 #include "wx/msw/private.h"
  25
  26 #ifndef WX_PRECOMP
  27 #include "wx/listbox.h"
  28 #include "wx/settings.h"
  29 #include "wx/brush.h"
  30 #include "wx/font.h"
  31 #include "wx/dc.h"
  32 #include "wx/utils.h"
  33 #endif
  34
  35 #include <windowsx.h>
  36
  37 #ifdef __WXWINE__
  38   #if defined(GetWindowStyle)
  39     #undef GetWindowStyle
  40   #endif
  41 #endif
  42
  43 #include "wx/dynarray.h"
  44 #include "wx/log.h"
  45
  46 #if wxUSE_OWNER_DRAWN
  47     #include  "wx/ownerdrw.h"
  48 #endif
  49
  50 #ifndef __TWIN32__
  51     #ifdef __GNUWIN32_OLD__
  52         #include "wx/msw/gnuwin32/extra.h"
  53     #endif
  54 #endif
  55
  56 #ifdef __WXWINE__
  57   #ifndef ListBox_SetItemData
  58     #define ListBox_SetItemData(hwndCtl, index, data) \
  59       ((int)(DWORD)SendMessage((hwndCtl), LB_SETITEMDATA, (WPARAM)(int)(index), (LPARAM)(data)))
  60   #endif
  61   #ifndef ListBox_GetHorizontalExtent
  62     #define ListBox_GetHorizontalExtent(hwndCtl) \
  63       ((int)(DWORD)SendMessage((hwndCtl), LB_GETHORIZONTALEXTENT, 0L, 0L))
  64   #endif
  65   #ifndef ListBox_GetSelCount
  66     #define ListBox_GetSelCount(hwndCtl) \
  67       ((int)(DWORD)SendMessage((hwndCtl), LB_GETSELCOUNT, 0L, 0L))
  68   #endif
  69   #ifndef ListBox_GetSelItems
  70     #define ListBox_GetSelItems(hwndCtl, cItems, lpItems) \
  71       ((int)(DWORD)SendMessage((hwndCtl), LB_GETSELITEMS, (WPARAM)(int)(cItems), (LPARAM)(int *)(lpItems)))
  72   #endif
  73   #ifndef ListBox_GetTextLen
  74     #define ListBox_GetTextLen(hwndCtl, index) \
  75       ((int)(DWORD)SendMessage((hwndCtl), LB_GETTEXTLEN, (WPARAM)(int)(index), 0L))
  76   #endif
  77   #ifndef ListBox_GetText
  78     #define ListBox_GetText(hwndCtl, index, lpszBuffer) \
  79       ((int)(DWORD)SendMessage((hwndCtl), LB_GETTEXT, (WPARAM)(int)(index), (LPARAM)(LPCTSTR)(lpszBuffer)))
  80   #endif
  81 #endif
  82
  83     IMPLEMENT_DYNAMIC_CLASS(wxListBox, wxControl)
  84
  85 // ============================================================================
  86 // list box item declaration and implementation
  87 // ============================================================================
  88
  89 #if wxUSE_OWNER_DRAWN
  90
  91 class wxListBoxItem : public wxOwnerDrawn
  92 {
  93 public:
  94     wxListBoxItem(const wxString& str = "");
  95 };
  96
  97 wxListBoxItem::wxListBoxItem(const wxString& str) : wxOwnerDrawn(str, FALSE)
  98 {
  99     // no bitmaps/checkmarks
 100     SetMarginWidth(0);
 101 }
 102
 103 wxOwnerDrawn *wxListBox::CreateItem(size_t n)
 104 {
 105     return new wxListBoxItem();
 106 }
 107
 108 #endif  //USE_OWNER_DRAWN
 109
 110 // ============================================================================
 111 // list box control implementation
 112 // ============================================================================
 113
 114 // ----------------------------------------------------------------------------
 115 // creation
 116 // ----------------------------------------------------------------------------
 117
 118 // Listbox item
 119 wxListBox::wxListBox()
 120 {
 121     m_noItems = 0;
 122     m_selected = 0;
 123 }
 124
 125 bool wxListBox::Create(wxWindow *parent,
 126                        wxWindowID id,
 127                        const wxPoint& pos,
 128                        const wxSize& size,
 129                        int n, const wxString choices[],
 130                        long style,
 131                        const wxValidator& validator,
 132                        const wxString& name)
 133 {
 134     m_noItems = 0;
 135     m_hWnd = 0;
 136     m_selected = 0;
 137
 138     SetName(name);
 139 #if wxUSE_VALIDATORS
 140     SetValidator(validator);
 141 #endif // wxUSE_VALIDATORS
 142
 143     if (parent)
 144         parent->AddChild(this);
 145
 146     wxSystemSettings settings;
 147     SetBackgroundColour(settings.GetSystemColour(wxSYS_COLOUR_WINDOW));
 148     SetForegroundColour(parent->GetForegroundColour());
 149
 150     m_windowId = ( id == -1 ) ? (int)NewControlId() : id;
 151
 152     int x = pos.x;
 153     int y = pos.y;
 154     int width = size.x;
 155     int height = size.y;
 156     m_windowStyle = style;
 157
 158     DWORD wstyle = WS_VISIBLE | WS_VSCROLL | WS_TABSTOP |
 159                    LBS_NOTIFY | LBS_HASSTRINGS /* | WS_CLIPSIBLINGS */;
 160     if (m_windowStyle & wxLB_MULTIPLE)
 161         wstyle |= LBS_MULTIPLESEL;
 162     else if (m_windowStyle & wxLB_EXTENDED)
 163         wstyle |= LBS_EXTENDEDSEL;
 164
 165     if (m_windowStyle & wxLB_ALWAYS_SB)
 166         wstyle |= LBS_DISABLENOSCROLL;
 167     if (m_windowStyle & wxLB_HSCROLL)
 168         wstyle |= WS_HSCROLL;
 169     if (m_windowStyle & wxLB_SORT)
 170         wstyle |= LBS_SORT;
 171
 172 #if wxUSE_OWNER_DRAWN
 173     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 174         // we don't support LBS_OWNERDRAWVARIABLE yet
 175         wstyle |= LBS_OWNERDRAWFIXED;
 176     }
 177 #endif
 178
 179     // Without this style, you get unexpected heights, so e.g. constraint layout
 180     // doesn't work properly
 181     wstyle |= LBS_NOINTEGRALHEIGHT;
 182
 183     bool want3D;
 184     WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D);
 185
 186     // Even with extended styles, need to combine with WS_BORDER for them to
 187     // look right.
 188     if ( want3D || wxStyleHasBorder(m_windowStyle) )
 189     {
 190         wstyle |= WS_BORDER;
 191     }
 192
 193     m_hWnd = (WXHWND)::CreateWindowEx(exStyle, wxT("LISTBOX"), NULL,
 194             wstyle | WS_CHILD,
 195             0, 0, 0, 0,
 196             (HWND)parent->GetHWND(), (HMENU)m_windowId,
 197             wxGetInstance(), NULL);
 198
 199     wxCHECK_MSG( m_hWnd, FALSE, wxT("Failed to create listbox") );
 200
 201 #if wxUSE_CTL3D
 202     if (want3D)
 203     {
 204         Ctl3dSubclassCtl(GetHwnd());
 205         m_useCtl3D = TRUE;
 206     }
 207 #endif
 208
 209     // Subclass again to catch messages
 210     SubclassWin(m_hWnd);
 211
 212     size_t ui;
 213     for (ui = 0; ui < (size_t)n; ui++) {
 214         Append(choices[ui]);
 215     }
 216
 217     if ( (m_windowStyle & wxLB_MULTIPLE) == 0 )
 218         SendMessage(GetHwnd(), LB_SETCURSEL, 0, 0);
 219
 220     SetFont(parent->GetFont());
 221
 222     SetSize(x, y, width, height);
 223
 224     return TRUE;
 225 }
 226
 227 wxListBox::~wxListBox()
 228 {
 229     Free();
 230 }
 231
 232 void wxListBox::SetupColours()
 233 {
 234     SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_WINDOW));
 235     SetForegroundColour(GetParent()->GetForegroundColour());
 236 }
 237
 238 // ----------------------------------------------------------------------------
 239 // implementation of wxListBoxBase methods
 240 // ----------------------------------------------------------------------------
 241
 242 void wxListBox::DoSetFirstItem(int N)
 243 {
 244     wxCHECK_RET( N >= 0 && N < m_noItems,
 245                  wxT("invalid index in wxListBox::SetFirstItem") );
 246
 247     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 248 }
 249
 250 void wxListBox::Delete(int N)
 251 {
 252     wxCHECK_RET( N >= 0 && N < m_noItems,
 253                  wxT("invalid index in wxListBox::Delete") );
 254
 255     // for owner drawn objects, the data is used for storing wxOwnerDrawn
 256     // pointers and we shouldn't touch it
 257 #if !wxUSE_OWNER_DRAWN
 258     if ( !(m_windowStyle & wxLB_OWNERDRAW) )
 259 #endif // !wxUSE_OWNER_DRAWN
 260         if ( HasClientObjectData() )
 261         {
 262             delete GetClientObject(N);
 263         }
 264
 265     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 266     m_noItems--;
 267
 268     SetHorizontalExtent("");
 269 }
 270
 271 int wxListBox::DoAppend(const wxString& item)
 272 {
 273     int index = ListBox_AddString(GetHwnd(), item);
 274     m_noItems++;
 275
 276 #if wxUSE_OWNER_DRAWN
 277     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 278         wxOwnerDrawn *pNewItem = CreateItem(index); // dummy argument
 279         pNewItem->SetName(item);
 280         m_aItems.Add(pNewItem);
 281         ListBox_SetItemData(GetHwnd(), index, pNewItem);
 282         pNewItem->SetFont(GetFont());
 283     }
 284 #endif
 285
 286     SetHorizontalExtent(item);
 287
 288     return index;
 289 }
 290
 291 void wxListBox::DoSetItems(const wxArrayString& choices, void** clientData)
 292 {
 293     // avoid flicker - but don't need to do this for a hidden listbox
 294     bool hideAndShow = IsShown();
 295     if ( hideAndShow )
 296     {
 297         ShowWindow(GetHwnd(), SW_HIDE);
 298     }
 299
 300     ListBox_ResetContent(GetHwnd());
 301
 302     m_noItems = choices.GetCount();
 303     int i;
 304     for (i = 0; i < m_noItems; i++)
 305     {
 306         ListBox_AddString(GetHwnd(), choices[i]);
 307         if ( clientData )
 308         {
 309 #if wxUSE_OWNER_DRAWN
 310             if ( m_windowStyle & wxLB_OWNERDRAW )
 311             {
 312                 wxASSERT_MSG(clientData[i] == NULL,
 313                              wxT("Can't use client data with owner-drawn listboxes"));
 314             }
 315             ListBox_SetItemData(GetHwnd(), i, clientData[i]);
 316 #else // !wxUSE_OWNER_DRAWN
 317             ListBox_SetItemData(GetHwnd(), i, clientData[i]);
 318 #endif // wxUSE_OWNER_DRAWN/!wxUSE_OWNER_DRAWN
 319         }
 320     }
 321
 322 #if wxUSE_OWNER_DRAWN
 323     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 324         // first delete old items
 325         size_t ui = m_aItems.Count();
 326         while ( ui-- != 0 ) {
 327             delete m_aItems[ui];
 328         }
 329         m_aItems.Empty();
 330
 331         // then create new ones
 332         for ( ui = 0; ui < (size_t)m_noItems; ui++ ) {
 333             wxOwnerDrawn *pNewItem = CreateItem(ui);
 334             pNewItem->SetName(choices[ui]);
 335             m_aItems.Add(pNewItem);
 336             ListBox_SetItemData(GetHwnd(), ui, pNewItem);
 337         }
 338     }
 339 #endif // wxUSE_OWNER_DRAWN
 340
 341     SetHorizontalExtent();
 342
 343     if ( hideAndShow )
 344     {
 345         // show the listbox back if we hid it
 346         ShowWindow(GetHwnd(), SW_SHOW);
 347     }
 348 }
 349
 350 int wxListBox::FindString(const wxString& s) const
 351 {
 352     int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
 353     if (pos == LB_ERR)
 354         return wxNOT_FOUND;
 355     else
 356         return pos;
 357 }
 358
 359 void wxListBox::Clear()
 360 {
 361     Free();
 362
 363     ListBox_ResetContent(GetHwnd());
 364
 365     m_noItems = 0;
 366     SetHorizontalExtent();
 367 }
 368
 369 void wxListBox::Free()
 370 {
 371 #if wxUSE_OWNER_DRAWN
 372     if ( m_windowStyle & wxLB_OWNERDRAW )
 373     {
 374         size_t uiCount = m_aItems.Count();
 375         while ( uiCount-- != 0 ) {
 376             delete m_aItems[uiCount];
 377         }
 378
 379         m_aItems.Clear();
 380     }
 381     else
 382 #endif // wxUSE_OWNER_DRAWN
 383     if ( HasClientObjectData() )
 384     {
 385         for ( size_t n = 0; n < (size_t)m_noItems; n++ )
 386         {
 387             delete GetClientObject(n);
 388         }
 389     }
 390 }
 391
 392 void wxListBox::SetSelection(int N, bool select)
 393 {
 394     wxCHECK_RET( N >= 0 && N < m_noItems,
 395                  wxT("invalid index in wxListBox::SetSelection") );
 396
 397     if ( HasMultipleSelection() )
 398     {
 399         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 400     }
 401     else
 402     {
 403         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 404     }
 405 }
 406
 407 bool wxListBox::IsSelected(int N) const
 408 {
 409     wxCHECK_MSG( N >= 0 && N < m_noItems, FALSE,
 410                  wxT("invalid index in wxListBox::Selected") );
 411
 412     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? FALSE : TRUE;
 413 }
 414
 415 wxClientData* wxListBox::DoGetItemClientObject(int n) const
 416 {
 417     return (wxClientData *)DoGetItemClientData(n);
 418 }
 419
 420 void *wxListBox::DoGetItemClientData(int n) const
 421 {
 422     wxCHECK_MSG( n >= 0 && n < m_noItems, NULL,
 423                  wxT("invalid index in wxListBox::GetClientData") );
 424
 425     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 426 }
 427
 428 void wxListBox::DoSetItemClientObject(int n, wxClientData* clientData)
 429 {
 430     DoSetItemClientData(n, clientData);
 431 }
 432
 433 void wxListBox::DoSetItemClientData(int n, void *clientData)
 434 {
 435     wxCHECK_RET( n >= 0 && n < m_noItems,
 436                  wxT("invalid index in wxListBox::SetClientData") );
 437
 438 #if wxUSE_OWNER_DRAWN
 439     if ( m_windowStyle & wxLB_OWNERDRAW )
 440     {
 441         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 442         // in OnMeasure/OnDraw.
 443         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 444     }
 445 #endif // wxUSE_OWNER_DRAWN
 446
 447     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 448         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 449 }
 450
 451 bool wxListBox::HasMultipleSelection() const
 452 {
 453     return (m_windowStyle & wxLB_MULTIPLE) || (m_windowStyle & wxLB_EXTENDED);
 454 }
 455
 456 // Return number of selections and an array of selected integers
 457 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 458 {
 459     aSelections.Empty();
 460
 461     if ( HasMultipleSelection() )
 462     {
 463         int no_sel = ListBox_GetSelCount(GetHwnd());
 464         if (no_sel != 0) {
 465             int *selections = new int[no_sel];
 466             int rc = ListBox_GetSelItems(GetHwnd(), no_sel, selections);
 467
 468             wxCHECK_MSG(rc != LB_ERR, -1, wxT("ListBox_GetSelItems failed"));
 469
 470             aSelections.Alloc(no_sel);
 471             for ( int n = 0; n < no_sel; n++ )
 472                 aSelections.Add(selections[n]);
 473
 474             delete [] selections;
 475         }
 476
 477         return no_sel;
 478     }
 479     else  // single-selection listbox
 480     {
 481         if (ListBox_GetCurSel(GetHwnd()) > -1)
 482             aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 483
 484         return aSelections.Count();
 485     }
 486 }
 487
 488 // Get single selection, for single choice list items
 489 int wxListBox::GetSelection() const
 490 {
 491     wxCHECK_MSG( !HasMultipleSelection(),
 492                  -1,
 493                  wxT("GetSelection() can't be used with multiple-selection listboxes, use GetSelections() instead.") );
 494
 495     return ListBox_GetCurSel(GetHwnd());
 496 }
 497
 498 // Find string for position
 499 wxString wxListBox::GetString(int N) const
 500 {
 501     wxCHECK_MSG( N >= 0 && N < m_noItems, "",
 502                  wxT("invalid index in wxListBox::GetClientData") );
 503
 504     int len = ListBox_GetTextLen(GetHwnd(), N);
 505
 506     // +1 for terminating NUL
 507     wxString result;
 508     ListBox_GetText(GetHwnd(), N, result.GetWriteBuf(len + 1));
 509     result.UngetWriteBuf();
 510
 511     return result;
 512 }
 513
 514 void
 515 wxListBox::DoInsertItems(const wxArrayString& items, int pos)
 516 {
 517     wxCHECK_RET( pos >= 0 && pos <= m_noItems,
 518                  wxT("invalid index in wxListBox::InsertItems") );
 519
 520     int nItems = items.GetCount();
 521     for ( int i = 0; i < nItems; i++ )
 522         ListBox_InsertString(GetHwnd(), i + pos, items[i]);
 523     m_noItems += nItems;
 524
 525     SetHorizontalExtent();
 526 }
 527
 528 void wxListBox::SetString(int N, const wxString& s)
 529 {
 530     wxCHECK_RET( N >= 0 && N < m_noItems,
 531                  wxT("invalid index in wxListBox::SetString") );
 532
 533     // remember the state of the item
 534     bool wasSelected = IsSelected(N);
 535
 536     void *oldData = NULL;
 537     wxClientData *oldObjData = NULL;
 538     if ( m_clientDataItemsType == ClientData_Void )
 539         oldData = GetClientData(N);
 540     else if ( m_clientDataItemsType == ClientData_Object )
 541         oldObjData = GetClientObject(N);
 542
 543     // delete and recreate it
 544     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 545
 546     int newN = N;
 547     if ( N == m_noItems - 1 )
 548         newN = -1;
 549
 550     ListBox_InsertString(GetHwnd(), newN, s);
 551
 552     // restore the client data
 553     if ( oldData )
 554         SetClientData(N, oldData);
 555     else if ( oldObjData )
 556         SetClientObject(N, oldObjData);
 557
 558     // we may have lost the selection
 559     if ( wasSelected )
 560         Select(N);
 561
 562 #if wxUSE_OWNER_DRAWN
 563     if ( m_windowStyle & wxLB_OWNERDRAW )
 564         // update item's text
 565         m_aItems[N]->SetName(s);
 566 #endif  //USE_OWNER_DRAWN
 567 }
 568
 569 int wxListBox::GetCount() const
 570 {
 571     return m_noItems;
 572 }
 573
 574 // ----------------------------------------------------------------------------
 575 // helpers
 576 // ----------------------------------------------------------------------------
 577
 578 // Windows-specific code to set the horizontal extent of the listbox, if
 579 // necessary. If s is non-NULL, it's used to calculate the horizontal extent.
 580 // Otherwise, all strings are used.
 581 void wxListBox::SetHorizontalExtent(const wxString& s)
 582 {
 583     // Only necessary if we want a horizontal scrollbar
 584     if (!(m_windowStyle & wxHSCROLL))
 585         return;
 586     TEXTMETRIC lpTextMetric;
 587
 588     if ( !s.IsEmpty() )
 589     {
 590         int existingExtent = (int)SendMessage(GetHwnd(), LB_GETHORIZONTALEXTENT, 0, 0L);
 591         HDC dc = GetWindowDC(GetHwnd());
 592         HFONT oldFont = 0;
 593         if (GetFont().Ok() && GetFont().GetResourceHandle())
 594             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 595
 596         GetTextMetrics(dc, &lpTextMetric);
 597         SIZE extentXY;
 598         ::GetTextExtentPoint(dc, (LPTSTR) (const wxChar *)s, s.Length(), &extentXY);
 599         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 600
 601         if (oldFont)
 602             ::SelectObject(dc, oldFont);
 603
 604         ReleaseDC(GetHwnd(), dc);
 605         if (extentX > existingExtent)
 606             SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(extentX), 0L);
 607     }
 608     else
 609     {
 610         int largestExtent = 0;
 611         HDC dc = GetWindowDC(GetHwnd());
 612         HFONT oldFont = 0;
 613         if (GetFont().Ok() && GetFont().GetResourceHandle())
 614             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 615
 616         GetTextMetrics(dc, &lpTextMetric);
 617         int i;
 618         for (i = 0; i < m_noItems; i++)
 619         {
 620             int len = (int)SendMessage(GetHwnd(), LB_GETTEXT, i, (LONG)wxBuffer);
 621             wxBuffer[len] = 0;
 622             SIZE extentXY;
 623             ::GetTextExtentPoint(dc, (LPTSTR)wxBuffer, len, &extentXY);
 624             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 625             if (extentX > largestExtent)
 626                 largestExtent = extentX;
 627         }
 628         if (oldFont)
 629             ::SelectObject(dc, oldFont);
 630
 631         ReleaseDC(GetHwnd(), dc);
 632         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 633     }
 634 }
 635
 636 wxSize wxListBox::DoGetBestSize() const
 637 {
 638     // find the widest string
 639     int wLine;
 640     int wListbox = 0;
 641     for ( int i = 0; i < m_noItems; i++ )
 642     {
 643         wxString str(GetString(i));
 644         GetTextExtent(str, &wLine, NULL);
 645         if ( wLine > wListbox )
 646             wListbox = wLine;
 647     }
 648
 649     // give it some reasonable default value if there are no strings in the
 650     // list
 651     if ( wListbox == 0 )
 652         wListbox = 100;
 653
 654     // the listbox should be slightly larger than the widest string
 655     int cx, cy;
 656     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 657
 658     wListbox += 3*cx;
 659
 660     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*(wxMax(m_noItems, 7));
 661
 662     return wxSize(wListbox, hListbox);
 663 }
 664
 665 // ----------------------------------------------------------------------------
 666 // callbacks
 667 // ----------------------------------------------------------------------------
 668
 669 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 670 {
 671     if ( param == LBN_SELCHANGE )
 672     {
 673         wxCommandEvent event(wxEVT_COMMAND_LISTBOX_SELECTED, m_windowId);
 674         event.SetEventObject( this );
 675
 676         wxArrayInt aSelections;
 677         int n, count = GetSelections(aSelections);
 678         if ( count > 0 )
 679         {
 680             n = aSelections[0];
 681             if ( HasClientObjectData() )
 682                 event.SetClientObject( GetClientObject(n) );
 683             else if ( HasClientUntypedData() )
 684                 event.SetClientData( GetClientData(n) );
 685             event.SetString( GetString(n) );
 686         }
 687         else
 688         {
 689             n = -1;
 690         }
 691
 692         event.m_commandInt = n;
 693
 694         return GetEventHandler()->ProcessEvent(event);
 695     }
 696     else if ( param == LBN_DBLCLK )
 697     {
 698         wxCommandEvent event(wxEVT_COMMAND_LISTBOX_DOUBLECLICKED, m_windowId);
 699         event.SetEventObject( this );
 700
 701         return GetEventHandler()->ProcessEvent(event);
 702     }
 703     //else:
 704
 705     return FALSE;
 706 }
 707
 708 // ----------------------------------------------------------------------------
 709 // wxCheckListBox support
 710 // ----------------------------------------------------------------------------
 711
 712 #if wxUSE_OWNER_DRAWN
 713
 714 // drawing
 715 // -------
 716
 717 // space beneath/above each row in pixels
 718 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 719 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 720
 721 // the height is the same for all items
 722 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 723
 724 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 725 //     message is not yet sent when we get here!
 726 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 727 {
 728     // only owner-drawn control should receive this message
 729     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 730
 731     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 732
 733     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 734
 735     wxDC dc;
 736     dc.SetHDC((WXHDC)hdc);
 737     dc.SetFont(wxSystemSettings::GetSystemFont(wxSYS_ANSI_VAR_FONT));
 738
 739     pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 740     pStruct->itemWidth  = dc.GetCharWidth();
 741
 742     dc.SetHDC(0);
 743
 744     DeleteDC(hdc);
 745
 746     return TRUE;
 747 }
 748
 749 // forward the message to the appropriate item
 750 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 751 {
 752     // only owner-drawn control should receive this message
 753     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 754
 755     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 756     UINT itemID = pStruct->itemID;
 757
 758     // the item may be -1 for an empty listbox
 759     if ( itemID == (UINT)-1 )
 760         return FALSE;
 761
 762     long data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 763
 764     wxCHECK( data && (data != LB_ERR), FALSE );
 765
 766     wxListBoxItem *pItem = (wxListBoxItem *)data;
 767
 768     wxDC dc;
 769     dc.SetHDC((WXHDC)pStruct->hDC, FALSE);
 770     wxRect rect(wxPoint(pStruct->rcItem.left, pStruct->rcItem.top),
 771                 wxPoint(pStruct->rcItem.right, pStruct->rcItem.bottom));
 772
 773     return pItem->OnDrawItem(dc, rect,
 774             (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 775             (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 776 }
 777
 778 #endif
 779     // wxUSE_OWNER_DRAWN