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 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 #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 #ifdef __WXWINE__
  40   #if defined(GetWindowStyle)
  41     #undef GetWindowStyle
  42   #endif
  43 #endif
  44
  45 #include "wx/dynarray.h"
  46 #include "wx/log.h"
  47
  48 #if wxUSE_OWNER_DRAWN
  49     #include  "wx/ownerdrw.h"
  50 #endif
  51
  52 #ifndef __TWIN32__
  53     #ifdef __GNUWIN32_OLD__
  54         #include "wx/msw/gnuwin32/extra.h"
  55     #endif
  56 #endif
  57
  58 #ifdef __WXWINE__
  59   #ifndef ListBox_SetItemData
  60     #define ListBox_SetItemData(hwndCtl, index, data) \
  61       ((int)(DWORD)SendMessage((hwndCtl), LB_SETITEMDATA, (WPARAM)(int)(index), (LPARAM)(data)))
  62   #endif
  63   #ifndef ListBox_GetHorizontalExtent
  64     #define ListBox_GetHorizontalExtent(hwndCtl) \
  65       ((int)(DWORD)SendMessage((hwndCtl), LB_GETHORIZONTALEXTENT, 0L, 0L))
  66   #endif
  67   #ifndef ListBox_GetSelCount
  68     #define ListBox_GetSelCount(hwndCtl) \
  69       ((int)(DWORD)SendMessage((hwndCtl), LB_GETSELCOUNT, 0L, 0L))
  70   #endif
  71   #ifndef ListBox_GetSelItems
  72     #define ListBox_GetSelItems(hwndCtl, cItems, lpItems) \
  73       ((int)(DWORD)SendMessage((hwndCtl), LB_GETSELITEMS, (WPARAM)(int)(cItems), (LPARAM)(int *)(lpItems)))
  74   #endif
  75   #ifndef ListBox_GetTextLen
  76     #define ListBox_GetTextLen(hwndCtl, index) \
  77       ((int)(DWORD)SendMessage((hwndCtl), LB_GETTEXTLEN, (WPARAM)(int)(index), 0L))
  78   #endif
  79   #ifndef ListBox_GetText
  80     #define ListBox_GetText(hwndCtl, index, lpszBuffer) \
  81       ((int)(DWORD)SendMessage((hwndCtl), LB_GETTEXT, (WPARAM)(int)(index), (LPARAM)(LPCTSTR)(lpszBuffer)))
  82   #endif
  83 #endif
  84
  85     IMPLEMENT_DYNAMIC_CLASS(wxListBox, wxControl)
  86
  87 // ============================================================================
  88 // list box item declaration and implementation
  89 // ============================================================================
  90
  91 #if wxUSE_OWNER_DRAWN
  92
  93 class wxListBoxItem : public wxOwnerDrawn
  94 {
  95 public:
  96     wxListBoxItem(const wxString& str = "");
  97 };
  98
  99 wxListBoxItem::wxListBoxItem(const wxString& str) : wxOwnerDrawn(str, FALSE)
 100 {
 101     // no bitmaps/checkmarks
 102     SetMarginWidth(0);
 103 }
 104
 105 wxOwnerDrawn *wxListBox::CreateItem(size_t WXUNUSED(n))
 106 {
 107     return new wxListBoxItem();
 108 }
 109
 110 #endif  //USE_OWNER_DRAWN
 111
 112 // ============================================================================
 113 // list box control implementation
 114 // ============================================================================
 115
 116 // ----------------------------------------------------------------------------
 117 // creation
 118 // ----------------------------------------------------------------------------
 119
 120 // Listbox item
 121 wxListBox::wxListBox()
 122 {
 123     m_noItems = 0;
 124     m_selected = 0;
 125 }
 126
 127 bool wxListBox::Create(wxWindow *parent,
 128                        wxWindowID id,
 129                        const wxPoint& pos,
 130                        const wxSize& size,
 131                        int n, const wxString choices[],
 132                        long style,
 133                        const wxValidator& validator,
 134                        const wxString& name)
 135 {
 136     m_noItems = 0;
 137     m_hWnd = 0;
 138     m_selected = 0;
 139
 140     SetName(name);
 141 #if wxUSE_VALIDATORS
 142     SetValidator(validator);
 143 #endif // wxUSE_VALIDATORS
 144
 145     if (parent)
 146         parent->AddChild(this);
 147
 148     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 149     SetForegroundColour(parent->GetForegroundColour());
 150
 151     m_windowId = ( id == -1 ) ? (int)NewControlId() : id;
 152
 153     int x = pos.x;
 154     int y = pos.y;
 155     int width = size.x;
 156     int height = size.y;
 157     m_windowStyle = style;
 158
 159     DWORD wstyle = WS_VISIBLE | WS_VSCROLL | WS_TABSTOP |
 160                    LBS_NOTIFY | LBS_HASSTRINGS /* | WS_CLIPSIBLINGS */;
 161
 162     wxASSERT_MSG( !(style & wxLB_MULTIPLE) || !(style & wxLB_EXTENDED),
 163                   _T("only one of listbox selection modes can be specified") );
 164     if ( m_windowStyle & wxCLIP_SIBLINGS )
 165         wstyle |= WS_CLIPSIBLINGS;
 166
 167     if (m_windowStyle & wxLB_MULTIPLE)
 168         wstyle |= LBS_MULTIPLESEL;
 169     else if (m_windowStyle & wxLB_EXTENDED)
 170         wstyle |= LBS_EXTENDEDSEL;
 171
 172     if (m_windowStyle & wxLB_ALWAYS_SB)
 173         wstyle |= LBS_DISABLENOSCROLL;
 174     if (m_windowStyle & wxLB_HSCROLL)
 175         wstyle |= WS_HSCROLL;
 176     if (m_windowStyle & wxLB_SORT)
 177         wstyle |= LBS_SORT;
 178
 179 #if wxUSE_OWNER_DRAWN
 180     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 181         // we don't support LBS_OWNERDRAWVARIABLE yet
 182         wstyle |= LBS_OWNERDRAWFIXED;
 183     }
 184 #endif
 185
 186     // Without this style, you get unexpected heights, so e.g. constraint layout
 187     // doesn't work properly
 188     wstyle |= LBS_NOINTEGRALHEIGHT;
 189
 190     bool want3D;
 191     WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D);
 192
 193     // Even with extended styles, need to combine with WS_BORDER for them to
 194     // look right.
 195     if ( want3D || wxStyleHasBorder(m_windowStyle) )
 196     {
 197         wstyle |= WS_BORDER;
 198     }
 199
 200     m_hWnd = (WXHWND)::CreateWindowEx(exStyle, wxT("LISTBOX"), NULL,
 201             wstyle | WS_CHILD,
 202             0, 0, 0, 0,
 203             (HWND)parent->GetHWND(), (HMENU)m_windowId,
 204             wxGetInstance(), NULL);
 205
 206     wxCHECK_MSG( m_hWnd, FALSE, wxT("Failed to create listbox") );
 207
 208 #if wxUSE_CTL3D
 209     if (want3D)
 210     {
 211         Ctl3dSubclassCtl(GetHwnd());
 212         m_useCtl3D = TRUE;
 213     }
 214 #endif
 215
 216     // Subclass again to catch messages
 217     SubclassWin(m_hWnd);
 218
 219     size_t ui;
 220     for (ui = 0; ui < (size_t)n; ui++) {
 221         Append(choices[ui]);
 222     }
 223
 224     if ( (m_windowStyle & wxLB_MULTIPLE) == 0 )
 225         SendMessage(GetHwnd(), LB_SETCURSEL, 0, 0);
 226
 227     SetFont(parent->GetFont());
 228
 229     SetSize(x, y, width, height);
 230
 231     return TRUE;
 232 }
 233
 234 wxListBox::~wxListBox()
 235 {
 236     Free();
 237 }
 238
 239 void wxListBox::SetupColours()
 240 {
 241     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 242     SetForegroundColour(GetParent()->GetForegroundColour());
 243 }
 244
 245 // ----------------------------------------------------------------------------
 246 // implementation of wxListBoxBase methods
 247 // ----------------------------------------------------------------------------
 248
 249 void wxListBox::DoSetFirstItem(int N)
 250 {
 251     wxCHECK_RET( N >= 0 && N < m_noItems,
 252                  wxT("invalid index in wxListBox::SetFirstItem") );
 253
 254     SendMessage(GetHwnd(), LB_SETTOPINDEX, (WPARAM)N, (LPARAM)0);
 255 }
 256
 257 void wxListBox::Delete(int N)
 258 {
 259     wxCHECK_RET( N >= 0 && N < m_noItems,
 260                  wxT("invalid index in wxListBox::Delete") );
 261
 262     // for owner drawn objects, the data is used for storing wxOwnerDrawn
 263     // pointers and we shouldn't touch it
 264 #if !wxUSE_OWNER_DRAWN
 265     if ( !(m_windowStyle & wxLB_OWNERDRAW) )
 266 #endif // !wxUSE_OWNER_DRAWN
 267         if ( HasClientObjectData() )
 268         {
 269             delete GetClientObject(N);
 270         }
 271
 272     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 273     m_noItems--;
 274
 275     SetHorizontalExtent("");
 276 }
 277
 278 int wxListBox::DoAppend(const wxString& item)
 279 {
 280     int index = ListBox_AddString(GetHwnd(), item);
 281     m_noItems++;
 282
 283 #if wxUSE_OWNER_DRAWN
 284     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 285         wxOwnerDrawn *pNewItem = CreateItem(index); // dummy argument
 286         pNewItem->SetName(item);
 287         m_aItems.Add(pNewItem);
 288         ListBox_SetItemData(GetHwnd(), index, pNewItem);
 289         pNewItem->SetFont(GetFont());
 290     }
 291 #endif
 292
 293     SetHorizontalExtent(item);
 294
 295     return index;
 296 }
 297
 298 void wxListBox::DoSetItems(const wxArrayString& choices, void** clientData)
 299 {
 300     // avoid flicker - but don't need to do this for a hidden listbox
 301     bool hideAndShow = IsShown();
 302     if ( hideAndShow )
 303     {
 304         ShowWindow(GetHwnd(), SW_HIDE);
 305     }
 306
 307     ListBox_ResetContent(GetHwnd());
 308
 309     m_noItems = choices.GetCount();
 310     int i;
 311     for (i = 0; i < m_noItems; i++)
 312     {
 313         ListBox_AddString(GetHwnd(), choices[i]);
 314         if ( clientData )
 315         {
 316 #if wxUSE_OWNER_DRAWN
 317             if ( m_windowStyle & wxLB_OWNERDRAW )
 318             {
 319                 wxASSERT_MSG(clientData[i] == NULL,
 320                              wxT("Can't use client data with owner-drawn listboxes"));
 321             }
 322             ListBox_SetItemData(GetHwnd(), i, clientData[i]);
 323 #else // !wxUSE_OWNER_DRAWN
 324             ListBox_SetItemData(GetHwnd(), i, clientData[i]);
 325 #endif // wxUSE_OWNER_DRAWN/!wxUSE_OWNER_DRAWN
 326         }
 327     }
 328
 329 #if wxUSE_OWNER_DRAWN
 330     if ( m_windowStyle & wxLB_OWNERDRAW ) {
 331         // first delete old items
 332         size_t ui = m_aItems.Count();
 333         while ( ui-- != 0 ) {
 334             delete m_aItems[ui];
 335         }
 336         m_aItems.Empty();
 337
 338         // then create new ones
 339         for ( ui = 0; ui < (size_t)m_noItems; ui++ ) {
 340             wxOwnerDrawn *pNewItem = CreateItem(ui);
 341             pNewItem->SetName(choices[ui]);
 342             m_aItems.Add(pNewItem);
 343             ListBox_SetItemData(GetHwnd(), ui, pNewItem);
 344         }
 345     }
 346 #endif // wxUSE_OWNER_DRAWN
 347
 348     SetHorizontalExtent();
 349
 350     if ( hideAndShow )
 351     {
 352         // show the listbox back if we hid it
 353         ShowWindow(GetHwnd(), SW_SHOW);
 354     }
 355 }
 356
 357 int wxListBox::FindString(const wxString& s) const
 358 {
 359     int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
 360     if (pos == LB_ERR)
 361         return wxNOT_FOUND;
 362     else
 363         return pos;
 364 }
 365
 366 void wxListBox::Clear()
 367 {
 368     Free();
 369
 370     ListBox_ResetContent(GetHwnd());
 371
 372     m_noItems = 0;
 373     SetHorizontalExtent();
 374 }
 375
 376 void wxListBox::Free()
 377 {
 378 #if wxUSE_OWNER_DRAWN
 379     if ( m_windowStyle & wxLB_OWNERDRAW )
 380     {
 381         size_t uiCount = m_aItems.Count();
 382         while ( uiCount-- != 0 ) {
 383             delete m_aItems[uiCount];
 384         }
 385
 386         m_aItems.Clear();
 387     }
 388     else
 389 #endif // wxUSE_OWNER_DRAWN
 390     if ( HasClientObjectData() )
 391     {
 392         for ( size_t n = 0; n < (size_t)m_noItems; n++ )
 393         {
 394             delete GetClientObject(n);
 395         }
 396     }
 397 }
 398
 399 void wxListBox::SetSelection(int N, bool select)
 400 {
 401     wxCHECK_RET( N >= 0 && N < m_noItems,
 402                  wxT("invalid index in wxListBox::SetSelection") );
 403
 404     if ( HasMultipleSelection() )
 405     {
 406         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 407     }
 408     else
 409     {
 410         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 411     }
 412 }
 413
 414 bool wxListBox::IsSelected(int N) const
 415 {
 416     wxCHECK_MSG( N >= 0 && N < m_noItems, FALSE,
 417                  wxT("invalid index in wxListBox::Selected") );
 418
 419     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? FALSE : TRUE;
 420 }
 421
 422 wxClientData* wxListBox::DoGetItemClientObject(int n) const
 423 {
 424     return (wxClientData *)DoGetItemClientData(n);
 425 }
 426
 427 void *wxListBox::DoGetItemClientData(int n) const
 428 {
 429     wxCHECK_MSG( n >= 0 && n < m_noItems, NULL,
 430                  wxT("invalid index in wxListBox::GetClientData") );
 431
 432     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 433 }
 434
 435 void wxListBox::DoSetItemClientObject(int n, wxClientData* clientData)
 436 {
 437     DoSetItemClientData(n, clientData);
 438 }
 439
 440 void wxListBox::DoSetItemClientData(int n, void *clientData)
 441 {
 442     wxCHECK_RET( n >= 0 && n < m_noItems,
 443                  wxT("invalid index in wxListBox::SetClientData") );
 444
 445 #if wxUSE_OWNER_DRAWN
 446     if ( m_windowStyle & wxLB_OWNERDRAW )
 447     {
 448         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 449         // in OnMeasure/OnDraw.
 450         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 451     }
 452 #endif // wxUSE_OWNER_DRAWN
 453
 454     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 455         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 456 }
 457
 458 // Return number of selections and an array of selected integers
 459 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 460 {
 461     aSelections.Empty();
 462
 463     if ( HasMultipleSelection() )
 464     {
 465         int no_sel = ListBox_GetSelCount(GetHwnd());
 466         if (no_sel != 0) {
 467             int *selections = new int[no_sel];
 468             int rc = ListBox_GetSelItems(GetHwnd(), no_sel, selections);
 469
 470             wxCHECK_MSG(rc != LB_ERR, -1, wxT("ListBox_GetSelItems failed"));
 471
 472             aSelections.Alloc(no_sel);
 473             for ( int n = 0; n < no_sel; n++ )
 474                 aSelections.Add(selections[n]);
 475
 476             delete [] selections;
 477         }
 478
 479         return no_sel;
 480     }
 481     else  // single-selection listbox
 482     {
 483         if (ListBox_GetCurSel(GetHwnd()) > -1)
 484             aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 485
 486         return aSelections.Count();
 487     }
 488 }
 489
 490 // Get single selection, for single choice list items
 491 int wxListBox::GetSelection() const
 492 {
 493     wxCHECK_MSG( !HasMultipleSelection(),
 494                  -1,
 495                  wxT("GetSelection() can't be used with multiple-selection listboxes, use GetSelections() instead.") );
 496
 497     return ListBox_GetCurSel(GetHwnd());
 498 }
 499
 500 // Find string for position
 501 wxString wxListBox::GetString(int N) const
 502 {
 503     wxCHECK_MSG( N >= 0 && N < m_noItems, "",
 504                  wxT("invalid index in wxListBox::GetClientData") );
 505
 506     int len = ListBox_GetTextLen(GetHwnd(), N);
 507
 508     // +1 for terminating NUL
 509     wxString result;
 510     ListBox_GetText(GetHwnd(), N, result.GetWriteBuf(len + 1));
 511     result.UngetWriteBuf();
 512
 513     return result;
 514 }
 515
 516 void
 517 wxListBox::DoInsertItems(const wxArrayString& items, int pos)
 518 {
 519     wxCHECK_RET( pos >= 0 && pos <= m_noItems,
 520                  wxT("invalid index in wxListBox::InsertItems") );
 521
 522     int nItems = items.GetCount();
 523     for ( int i = 0; i < nItems; i++ )
 524         ListBox_InsertString(GetHwnd(), i + pos, items[i]);
 525     m_noItems += nItems;
 526
 527     SetHorizontalExtent();
 528 }
 529
 530 void wxListBox::SetString(int N, const wxString& s)
 531 {
 532     wxCHECK_RET( N >= 0 && N < m_noItems,
 533                  wxT("invalid index in wxListBox::SetString") );
 534
 535     // remember the state of the item
 536     bool wasSelected = IsSelected(N);
 537
 538     void *oldData = NULL;
 539     wxClientData *oldObjData = NULL;
 540     if ( m_clientDataItemsType == wxClientData_Void )
 541         oldData = GetClientData(N);
 542     else if ( m_clientDataItemsType == wxClientData_Object )
 543         oldObjData = GetClientObject(N);
 544
 545     // delete and recreate it
 546     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 547
 548     int newN = N;
 549     if ( N == m_noItems - 1 )
 550         newN = -1;
 551
 552     ListBox_InsertString(GetHwnd(), newN, s);
 553
 554     // restore the client data
 555     if ( oldData )
 556         SetClientData(N, oldData);
 557     else if ( oldObjData )
 558         SetClientObject(N, oldObjData);
 559
 560     // we may have lost the selection
 561     if ( wasSelected )
 562         Select(N);
 563
 564 #if wxUSE_OWNER_DRAWN
 565     if ( m_windowStyle & wxLB_OWNERDRAW )
 566     {
 567         // update item's text
 568         m_aItems[N]->SetName(s);
 569         // reassign the item's data
 570         ListBox_SetItemData(GetHwnd(), N, m_aItems[N]);
 571     }
 572 #endif  //USE_OWNER_DRAWN
 573 }
 574
 575 int wxListBox::GetCount() const
 576 {
 577     return m_noItems;
 578 }
 579
 580 // ----------------------------------------------------------------------------
 581 // helpers
 582 // ----------------------------------------------------------------------------
 583
 584 // Windows-specific code to set the horizontal extent of the listbox, if
 585 // necessary. If s is non-NULL, it's used to calculate the horizontal extent.
 586 // Otherwise, all strings are used.
 587 void wxListBox::SetHorizontalExtent(const wxString& s)
 588 {
 589     // Only necessary if we want a horizontal scrollbar
 590     if (!(m_windowStyle & wxHSCROLL))
 591         return;
 592     TEXTMETRIC lpTextMetric;
 593
 594     if ( !s.IsEmpty() )
 595     {
 596         int existingExtent = (int)SendMessage(GetHwnd(), LB_GETHORIZONTALEXTENT, 0, 0L);
 597         HDC dc = GetWindowDC(GetHwnd());
 598         HFONT oldFont = 0;
 599         if (GetFont().Ok() && GetFont().GetResourceHandle())
 600             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 601
 602         GetTextMetrics(dc, &lpTextMetric);
 603         SIZE extentXY;
 604         ::GetTextExtentPoint(dc, (LPTSTR) (const wxChar *)s, s.Length(), &extentXY);
 605         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 606
 607         if (oldFont)
 608             ::SelectObject(dc, oldFont);
 609
 610         ReleaseDC(GetHwnd(), dc);
 611         if (extentX > existingExtent)
 612             SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(extentX), 0L);
 613     }
 614     else
 615     {
 616         int largestExtent = 0;
 617         HDC dc = GetWindowDC(GetHwnd());
 618         HFONT oldFont = 0;
 619         if (GetFont().Ok() && GetFont().GetResourceHandle())
 620             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 621
 622         GetTextMetrics(dc, &lpTextMetric);
 623         int i;
 624         for (i = 0; i < m_noItems; i++)
 625         {
 626             int len = (int)SendMessage(GetHwnd(), LB_GETTEXT, i, (LONG)wxBuffer);
 627             wxBuffer[len] = 0;
 628             SIZE extentXY;
 629             ::GetTextExtentPoint(dc, (LPTSTR)wxBuffer, len, &extentXY);
 630             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 631             if (extentX > largestExtent)
 632                 largestExtent = extentX;
 633         }
 634         if (oldFont)
 635             ::SelectObject(dc, oldFont);
 636
 637         ReleaseDC(GetHwnd(), dc);
 638         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 639     }
 640 }
 641
 642 wxSize wxListBox::DoGetBestSize() const
 643 {
 644     // find the widest string
 645     int wLine;
 646     int wListbox = 0;
 647     for ( int i = 0; i < m_noItems; i++ )
 648     {
 649         wxString str(GetString(i));
 650         GetTextExtent(str, &wLine, NULL);
 651         if ( wLine > wListbox )
 652             wListbox = wLine;
 653     }
 654
 655     // give it some reasonable default value if there are no strings in the
 656     // list
 657     if ( wListbox == 0 )
 658         wListbox = 100;
 659
 660     // the listbox should be slightly larger than the widest string
 661     int cx, cy;
 662     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 663
 664     wListbox += 3*cx;
 665
 666     // don't make the listbox too tall (limit height to 10 items) but don't
 667     // make it too small neither
 668     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*
 669                     wxMin(wxMax(m_noItems, 3), 10);
 670
 671     return wxSize(wListbox, hListbox);
 672 }
 673
 674 // ----------------------------------------------------------------------------
 675 // callbacks
 676 // ----------------------------------------------------------------------------
 677
 678 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 679 {
 680     wxEventType evtType;
 681     if ( param == LBN_SELCHANGE )
 682     {
 683         evtType = wxEVT_COMMAND_LISTBOX_SELECTED;
 684     }
 685     else if ( param == LBN_DBLCLK )
 686     {
 687         evtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;
 688     }
 689     else
 690     {
 691         // some event we're not interested in
 692         return FALSE;
 693     }
 694
 695     wxCommandEvent event(evtType, m_windowId);
 696     event.SetEventObject( this );
 697
 698     wxArrayInt aSelections;
 699     int n, count = GetSelections(aSelections);
 700     if ( count > 0 )
 701     {
 702         n = aSelections[0];
 703         if ( HasClientObjectData() )
 704             event.SetClientObject( GetClientObject(n) );
 705         else if ( HasClientUntypedData() )
 706             event.SetClientData( GetClientData(n) );
 707         event.SetString( GetString(n) );
 708     }
 709     else
 710     {
 711         n = -1;
 712     }
 713
 714     event.m_commandInt = n;
 715
 716     return GetEventHandler()->ProcessEvent(event);
 717 }
 718
 719 // ----------------------------------------------------------------------------
 720 // wxCheckListBox support
 721 // ----------------------------------------------------------------------------
 722
 723 #if wxUSE_OWNER_DRAWN
 724
 725 // drawing
 726 // -------
 727
 728 // space beneath/above each row in pixels
 729 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 730 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 731
 732 // the height is the same for all items
 733 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 734
 735 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 736 //     message is not yet sent when we get here!
 737 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 738 {
 739     // only owner-drawn control should receive this message
 740     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 741
 742     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 743
 744     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 745
 746     wxDC dc;
 747     dc.SetHDC((WXHDC)hdc);
 748     dc.SetFont(wxSystemSettings::GetFont(wxSYS_ANSI_VAR_FONT));
 749
 750     pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 751     pStruct->itemWidth  = dc.GetCharWidth();
 752
 753     dc.SetHDC(0);
 754
 755     DeleteDC(hdc);
 756
 757     return TRUE;
 758 }
 759
 760 // forward the message to the appropriate item
 761 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 762 {
 763     // only owner-drawn control should receive this message
 764     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 765
 766     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 767     UINT itemID = pStruct->itemID;
 768
 769     // the item may be -1 for an empty listbox
 770     if ( itemID == (UINT)-1 )
 771         return FALSE;
 772
 773     long data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 774
 775     wxCHECK( data && (data != LB_ERR), FALSE );
 776
 777     wxListBoxItem *pItem = (wxListBoxItem *)data;
 778
 779     wxDCTemp dc((WXHDC)pStruct->hDC);
 780     wxRect rect(wxPoint(pStruct->rcItem.left, pStruct->rcItem.top),
 781                 wxPoint(pStruct->rcItem.right, pStruct->rcItem.bottom));
 782
 783     return pItem->OnDrawItem(dc, rect,
 784                              (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 785                              (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 786 }
 787
 788 #endif // wxUSE_OWNER_DRAWN
 789
 790 #endif // wxUSE_LISTBOX