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.Insert(pNewItem, index);
 288         ListBox_SetItemData(GetHwnd(), index, pNewItem);
 289         pNewItem->SetFont(GetFont());
 290     }
 291 #endif // wxUSE_OWNER_DRAWN
 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         WX_CLEAR_ARRAY(m_aItems);
 333
 334         // then create new ones
 335         for ( size_t ui = 0; ui < (size_t)m_noItems; ui++ ) {
 336             wxOwnerDrawn *pNewItem = CreateItem(ui);
 337             pNewItem->SetName(choices[ui]);
 338             m_aItems.Add(pNewItem);
 339             ListBox_SetItemData(GetHwnd(), ui, pNewItem);
 340         }
 341     }
 342 #endif // wxUSE_OWNER_DRAWN
 343
 344     SetHorizontalExtent();
 345
 346     if ( hideAndShow )
 347     {
 348         // show the listbox back if we hid it
 349         ShowWindow(GetHwnd(), SW_SHOW);
 350     }
 351 }
 352
 353 int wxListBox::FindString(const wxString& s) const
 354 {
 355     int pos = ListBox_FindStringExact(GetHwnd(), (WPARAM)-1, s);
 356     if (pos == LB_ERR)
 357         return wxNOT_FOUND;
 358     else
 359         return pos;
 360 }
 361
 362 void wxListBox::Clear()
 363 {
 364     Free();
 365
 366     ListBox_ResetContent(GetHwnd());
 367
 368     m_noItems = 0;
 369     SetHorizontalExtent();
 370 }
 371
 372 void wxListBox::Free()
 373 {
 374 #if wxUSE_OWNER_DRAWN
 375     if ( m_windowStyle & wxLB_OWNERDRAW )
 376     {
 377         WX_CLEAR_ARRAY(m_aItems);
 378     }
 379     else
 380 #endif // wxUSE_OWNER_DRAWN
 381     if ( HasClientObjectData() )
 382     {
 383         for ( size_t n = 0; n < (size_t)m_noItems; n++ )
 384         {
 385             delete GetClientObject(n);
 386         }
 387     }
 388 }
 389
 390 void wxListBox::SetSelection(int N, bool select)
 391 {
 392     wxCHECK_RET( N >= 0 && N < m_noItems,
 393                  wxT("invalid index in wxListBox::SetSelection") );
 394
 395     if ( HasMultipleSelection() )
 396     {
 397         SendMessage(GetHwnd(), LB_SETSEL, select, N);
 398     }
 399     else
 400     {
 401         SendMessage(GetHwnd(), LB_SETCURSEL, select ? N : -1, 0);
 402     }
 403 }
 404
 405 bool wxListBox::IsSelected(int N) const
 406 {
 407     wxCHECK_MSG( N >= 0 && N < m_noItems, FALSE,
 408                  wxT("invalid index in wxListBox::Selected") );
 409
 410     return SendMessage(GetHwnd(), LB_GETSEL, N, 0) == 0 ? FALSE : TRUE;
 411 }
 412
 413 wxClientData* wxListBox::DoGetItemClientObject(int n) const
 414 {
 415     return (wxClientData *)DoGetItemClientData(n);
 416 }
 417
 418 void *wxListBox::DoGetItemClientData(int n) const
 419 {
 420     wxCHECK_MSG( n >= 0 && n < m_noItems, NULL,
 421                  wxT("invalid index in wxListBox::GetClientData") );
 422
 423     return (void *)SendMessage(GetHwnd(), LB_GETITEMDATA, n, 0);
 424 }
 425
 426 void wxListBox::DoSetItemClientObject(int n, wxClientData* clientData)
 427 {
 428     DoSetItemClientData(n, clientData);
 429 }
 430
 431 void wxListBox::DoSetItemClientData(int n, void *clientData)
 432 {
 433     wxCHECK_RET( n >= 0 && n < m_noItems,
 434                  wxT("invalid index in wxListBox::SetClientData") );
 435
 436 #if wxUSE_OWNER_DRAWN
 437     if ( m_windowStyle & wxLB_OWNERDRAW )
 438     {
 439         // client data must be pointer to wxOwnerDrawn, otherwise we would crash
 440         // in OnMeasure/OnDraw.
 441         wxFAIL_MSG(wxT("Can't use client data with owner-drawn listboxes"));
 442     }
 443 #endif // wxUSE_OWNER_DRAWN
 444
 445     if ( ListBox_SetItemData(GetHwnd(), n, clientData) == LB_ERR )
 446         wxLogDebug(wxT("LB_SETITEMDATA failed"));
 447 }
 448
 449 // Return number of selections and an array of selected integers
 450 int wxListBox::GetSelections(wxArrayInt& aSelections) const
 451 {
 452     aSelections.Empty();
 453
 454     if ( HasMultipleSelection() )
 455     {
 456         int no_sel = ListBox_GetSelCount(GetHwnd());
 457         if (no_sel != 0) {
 458             int *selections = new int[no_sel];
 459             int rc = ListBox_GetSelItems(GetHwnd(), no_sel, selections);
 460
 461             wxCHECK_MSG(rc != LB_ERR, -1, wxT("ListBox_GetSelItems failed"));
 462
 463             aSelections.Alloc(no_sel);
 464             for ( int n = 0; n < no_sel; n++ )
 465                 aSelections.Add(selections[n]);
 466
 467             delete [] selections;
 468         }
 469
 470         return no_sel;
 471     }
 472     else  // single-selection listbox
 473     {
 474         if (ListBox_GetCurSel(GetHwnd()) > -1)
 475             aSelections.Add(ListBox_GetCurSel(GetHwnd()));
 476
 477         return aSelections.Count();
 478     }
 479 }
 480
 481 // Get single selection, for single choice list items
 482 int wxListBox::GetSelection() const
 483 {
 484     wxCHECK_MSG( !HasMultipleSelection(),
 485                  -1,
 486                  wxT("GetSelection() can't be used with multiple-selection listboxes, use GetSelections() instead.") );
 487
 488     return ListBox_GetCurSel(GetHwnd());
 489 }
 490
 491 // Find string for position
 492 wxString wxListBox::GetString(int N) const
 493 {
 494     wxCHECK_MSG( N >= 0 && N < m_noItems, "",
 495                  wxT("invalid index in wxListBox::GetClientData") );
 496
 497     int len = ListBox_GetTextLen(GetHwnd(), N);
 498
 499     // +1 for terminating NUL
 500     wxString result;
 501     ListBox_GetText(GetHwnd(), N, result.GetWriteBuf(len + 1));
 502     result.UngetWriteBuf();
 503
 504     return result;
 505 }
 506
 507 void
 508 wxListBox::DoInsertItems(const wxArrayString& items, int pos)
 509 {
 510     wxCHECK_RET( pos >= 0 && pos <= m_noItems,
 511                  wxT("invalid index in wxListBox::InsertItems") );
 512
 513     int nItems = items.GetCount();
 514     for ( int i = 0; i < nItems; i++ )
 515     {
 516         int idx = ListBox_InsertString(GetHwnd(), i + pos, items[i]);
 517
 518 #if wxUSE_OWNER_DRAWN
 519         wxOwnerDrawn *pNewItem = CreateItem(idx);
 520         pNewItem->SetName(items[i]);
 521         pNewItem->SetFont(GetFont());
 522         m_aItems.Insert(pNewItem, idx);
 523
 524         ListBox_SetItemData(GetHwnd(), idx, pNewItem);
 525 #endif // wxUSE_OWNER_DRAWN
 526     }
 527
 528     m_noItems += nItems;
 529
 530     SetHorizontalExtent();
 531 }
 532
 533 void wxListBox::SetString(int N, const wxString& s)
 534 {
 535     wxCHECK_RET( N >= 0 && N < m_noItems,
 536                  wxT("invalid index in wxListBox::SetString") );
 537
 538     // remember the state of the item
 539     bool wasSelected = IsSelected(N);
 540
 541     void *oldData = NULL;
 542     wxClientData *oldObjData = NULL;
 543     if ( m_clientDataItemsType == wxClientData_Void )
 544         oldData = GetClientData(N);
 545     else if ( m_clientDataItemsType == wxClientData_Object )
 546         oldObjData = GetClientObject(N);
 547
 548     // delete and recreate it
 549     SendMessage(GetHwnd(), LB_DELETESTRING, N, 0);
 550
 551     int newN = N;
 552     if ( N == m_noItems - 1 )
 553         newN = -1;
 554
 555     ListBox_InsertString(GetHwnd(), newN, s);
 556
 557     // restore the client data
 558     if ( oldData )
 559         SetClientData(N, oldData);
 560     else if ( oldObjData )
 561         SetClientObject(N, oldObjData);
 562
 563     // we may have lost the selection
 564     if ( wasSelected )
 565         Select(N);
 566
 567 #if wxUSE_OWNER_DRAWN
 568     if ( m_windowStyle & wxLB_OWNERDRAW )
 569     {
 570         // update item's text
 571         m_aItems[N]->SetName(s);
 572
 573         // reassign the item's data
 574         ListBox_SetItemData(GetHwnd(), N, m_aItems[N]);
 575     }
 576 #endif  //USE_OWNER_DRAWN
 577 }
 578
 579 int wxListBox::GetCount() const
 580 {
 581     return m_noItems;
 582 }
 583
 584 // ----------------------------------------------------------------------------
 585 // helpers
 586 // ----------------------------------------------------------------------------
 587
 588 // Windows-specific code to set the horizontal extent of the listbox, if
 589 // necessary. If s is non-NULL, it's used to calculate the horizontal extent.
 590 // Otherwise, all strings are used.
 591 void wxListBox::SetHorizontalExtent(const wxString& s)
 592 {
 593     // Only necessary if we want a horizontal scrollbar
 594     if (!(m_windowStyle & wxHSCROLL))
 595         return;
 596     TEXTMETRIC lpTextMetric;
 597
 598     if ( !s.IsEmpty() )
 599     {
 600         int existingExtent = (int)SendMessage(GetHwnd(), LB_GETHORIZONTALEXTENT, 0, 0L);
 601         HDC dc = GetWindowDC(GetHwnd());
 602         HFONT oldFont = 0;
 603         if (GetFont().Ok() && GetFont().GetResourceHandle())
 604             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 605
 606         GetTextMetrics(dc, &lpTextMetric);
 607         SIZE extentXY;
 608         ::GetTextExtentPoint(dc, (LPTSTR) (const wxChar *)s, s.Length(), &extentXY);
 609         int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 610
 611         if (oldFont)
 612             ::SelectObject(dc, oldFont);
 613
 614         ReleaseDC(GetHwnd(), dc);
 615         if (extentX > existingExtent)
 616             SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(extentX), 0L);
 617     }
 618     else
 619     {
 620         int largestExtent = 0;
 621         HDC dc = GetWindowDC(GetHwnd());
 622         HFONT oldFont = 0;
 623         if (GetFont().Ok() && GetFont().GetResourceHandle())
 624             oldFont = (HFONT) ::SelectObject(dc, (HFONT) GetFont().GetResourceHandle());
 625
 626         GetTextMetrics(dc, &lpTextMetric);
 627         int i;
 628         for (i = 0; i < m_noItems; i++)
 629         {
 630             int len = (int)SendMessage(GetHwnd(), LB_GETTEXT, i, (LONG)wxBuffer);
 631             wxBuffer[len] = 0;
 632             SIZE extentXY;
 633             ::GetTextExtentPoint(dc, (LPTSTR)wxBuffer, len, &extentXY);
 634             int extentX = (int)(extentXY.cx + lpTextMetric.tmAveCharWidth);
 635             if (extentX > largestExtent)
 636                 largestExtent = extentX;
 637         }
 638         if (oldFont)
 639             ::SelectObject(dc, oldFont);
 640
 641         ReleaseDC(GetHwnd(), dc);
 642         SendMessage(GetHwnd(), LB_SETHORIZONTALEXTENT, LOWORD(largestExtent), 0L);
 643     }
 644 }
 645
 646 wxSize wxListBox::DoGetBestSize() const
 647 {
 648     // find the widest string
 649     int wLine;
 650     int wListbox = 0;
 651     for ( int i = 0; i < m_noItems; i++ )
 652     {
 653         wxString str(GetString(i));
 654         GetTextExtent(str, &wLine, NULL);
 655         if ( wLine > wListbox )
 656             wListbox = wLine;
 657     }
 658
 659     // give it some reasonable default value if there are no strings in the
 660     // list
 661     if ( wListbox == 0 )
 662         wListbox = 100;
 663
 664     // the listbox should be slightly larger than the widest string
 665     int cx, cy;
 666     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 667
 668     wListbox += 3*cx;
 669
 670     // don't make the listbox too tall (limit height to 10 items) but don't
 671     // make it too small neither
 672     int hListbox = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*
 673                     wxMin(wxMax(m_noItems, 3), 10);
 674
 675     return wxSize(wListbox, hListbox);
 676 }
 677
 678 // ----------------------------------------------------------------------------
 679 // callbacks
 680 // ----------------------------------------------------------------------------
 681
 682 bool wxListBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 683 {
 684     wxEventType evtType;
 685     if ( param == LBN_SELCHANGE )
 686     {
 687         evtType = wxEVT_COMMAND_LISTBOX_SELECTED;
 688     }
 689     else if ( param == LBN_DBLCLK )
 690     {
 691         evtType = wxEVT_COMMAND_LISTBOX_DOUBLECLICKED;
 692     }
 693     else
 694     {
 695         // some event we're not interested in
 696         return FALSE;
 697     }
 698
 699     wxCommandEvent event(evtType, m_windowId);
 700     event.SetEventObject( this );
 701
 702     wxArrayInt aSelections;
 703     int n, count = GetSelections(aSelections);
 704     if ( count > 0 )
 705     {
 706         n = aSelections[0];
 707         if ( HasClientObjectData() )
 708             event.SetClientObject( GetClientObject(n) );
 709         else if ( HasClientUntypedData() )
 710             event.SetClientData( GetClientData(n) );
 711         event.SetString( GetString(n) );
 712     }
 713     else
 714     {
 715         n = -1;
 716     }
 717
 718     event.m_commandInt = n;
 719
 720     return GetEventHandler()->ProcessEvent(event);
 721 }
 722
 723 // ----------------------------------------------------------------------------
 724 // wxCheckListBox support
 725 // ----------------------------------------------------------------------------
 726
 727 #if wxUSE_OWNER_DRAWN
 728
 729 // drawing
 730 // -------
 731
 732 // space beneath/above each row in pixels
 733 // "standard" checklistbox use 1 here, some might prefer 2. 0 is ugly.
 734 #define OWNER_DRAWN_LISTBOX_EXTRA_SPACE    (1)
 735
 736 // the height is the same for all items
 737 // TODO should be changed for LBS_OWNERDRAWVARIABLE style listboxes
 738
 739 // NB: can't forward this to wxListBoxItem because LB_SETITEMDATA
 740 //     message is not yet sent when we get here!
 741 bool wxListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 742 {
 743     // only owner-drawn control should receive this message
 744     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 745
 746     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 747
 748     HDC hdc = CreateIC(wxT("DISPLAY"), NULL, NULL, 0);
 749
 750     wxDC dc;
 751     dc.SetHDC((WXHDC)hdc);
 752     dc.SetFont(wxSystemSettings::GetFont(wxSYS_ANSI_VAR_FONT));
 753
 754     pStruct->itemHeight = dc.GetCharHeight() + 2*OWNER_DRAWN_LISTBOX_EXTRA_SPACE;
 755     pStruct->itemWidth  = dc.GetCharWidth();
 756
 757     dc.SetHDC(0);
 758
 759     DeleteDC(hdc);
 760
 761     return TRUE;
 762 }
 763
 764 // forward the message to the appropriate item
 765 bool wxListBox::MSWOnDraw(WXDRAWITEMSTRUCT *item)
 766 {
 767     // only owner-drawn control should receive this message
 768     wxCHECK( ((m_windowStyle & wxLB_OWNERDRAW) == wxLB_OWNERDRAW), FALSE );
 769
 770     DRAWITEMSTRUCT *pStruct = (DRAWITEMSTRUCT *)item;
 771     UINT itemID = pStruct->itemID;
 772
 773     // the item may be -1 for an empty listbox
 774     if ( itemID == (UINT)-1 )
 775         return FALSE;
 776
 777     long data = ListBox_GetItemData(GetHwnd(), pStruct->itemID);
 778
 779     wxCHECK( data && (data != LB_ERR), FALSE );
 780
 781     wxListBoxItem *pItem = (wxListBoxItem *)data;
 782
 783     wxDCTemp dc((WXHDC)pStruct->hDC);
 784     wxRect rect(wxPoint(pStruct->rcItem.left, pStruct->rcItem.top),
 785                 wxPoint(pStruct->rcItem.right, pStruct->rcItem.bottom));
 786
 787     return pItem->OnDrawItem(dc, rect,
 788                              (wxOwnerDrawn::wxODAction)pStruct->itemAction,
 789                              (wxOwnerDrawn::wxODStatus)pStruct->itemState);
 790 }
 791
 792 #endif // wxUSE_OWNER_DRAWN
 793
 794 #endif // wxUSE_LISTBOX