src/msw/choice.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        choice.cpp
   3 // Purpose:     wxChoice
   4 // Author:      Julian Smart
   5 // Modified by: Vadim Zeitlin to derive from wxChoiceBase
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21     #pragma implementation "choice.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #if wxUSE_CHOICE
  32
  33 #ifndef WX_PRECOMP
  34     #include "wx/choice.h"
  35     #include "wx/utils.h"
  36     #include "wx/log.h"
  37     #include "wx/brush.h"
  38     #include "wx/settings.h"
  39 #endif
  40
  41 #include "wx/msw/private.h"
  42
  43 IMPLEMENT_DYNAMIC_CLASS(wxChoice, wxControl)
  44
  45 // ============================================================================
  46 // implementation
  47 // ============================================================================
  48
  49 // ----------------------------------------------------------------------------
  50 // creation
  51 // ----------------------------------------------------------------------------
  52
  53 bool wxChoice::Create(wxWindow *parent,
  54                       wxWindowID id,
  55                       const wxPoint& pos,
  56                       const wxSize& size,
  57                       int n, const wxString choices[],
  58                       long style,
  59                       const wxValidator& validator,
  60                       const wxString& name)
  61 {
  62     if ( !CreateControl(parent, id, pos, size, style, validator, name) )
  63         return FALSE;
  64
  65     long msStyle = WS_CHILD | CBS_DROPDOWNLIST | WS_TABSTOP | WS_VISIBLE | WS_HSCROLL | WS_VSCROLL /* | WS_CLIPSIBLINGS */;
  66     if ( style & wxCB_SORT )
  67         msStyle |= CBS_SORT;
  68
  69     if ( style & wxCLIP_SIBLINGS )
  70         msStyle |= WS_CLIPSIBLINGS;
  71
  72
  73     // Experience shows that wxChoice vs. wxComboBox distinction confuses
  74     // quite a few people - try to help them
  75     wxASSERT_MSG( !(style & wxCB_DROPDOWN) &&
  76                   !(style & wxCB_READONLY) &&
  77                   !(style & wxCB_SIMPLE),
  78                   _T("this style flag is ignored by wxChoice, you ")
  79                   _T("probably want to use a wxComboBox") );
  80
  81     if ( !MSWCreateControl(wxT("COMBOBOX"), msStyle) )
  82         return FALSE;
  83
  84     // A choice/combobox normally has a white background (or other, depending
  85     // on global settings) rather than inheriting the parent's background colour.
  86     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
  87
  88     for ( int i = 0; i < n; i++ )
  89     {
  90         Append(choices[i]);
  91     }
  92
  93     SetSize(pos.x, pos.y, size.x, size.y);
  94
  95     return TRUE;
  96 }
  97
  98 wxChoice::~wxChoice()
  99 {
 100     Free();
 101 }
 102
 103 // ----------------------------------------------------------------------------
 104 // adding/deleting items to/from the list
 105 // ----------------------------------------------------------------------------
 106
 107 int wxChoice::DoAppend(const wxString& item)
 108 {
 109     int n = (int)SendMessage(GetHwnd(), CB_ADDSTRING, 0, (LONG)item.c_str());
 110     if ( n == CB_ERR )
 111     {
 112         wxLogLastError(wxT("SendMessage(CB_ADDSTRING)"));
 113     }
 114
 115     return n;
 116 }
 117
 118 void wxChoice::Delete(int n)
 119 {
 120     wxCHECK_RET( n < GetCount(), wxT("invalid item index in wxChoice::Delete") );
 121
 122     if ( HasClientObjectData() )
 123     {
 124         delete GetClientObject(n);
 125     }
 126
 127     SendMessage(GetHwnd(), CB_DELETESTRING, n, 0);
 128 }
 129
 130 void wxChoice::Clear()
 131 {
 132     Free();
 133
 134     SendMessage(GetHwnd(), CB_RESETCONTENT, 0, 0);
 135 }
 136
 137 void wxChoice::Free()
 138 {
 139     if ( HasClientObjectData() )
 140     {
 141         size_t count = GetCount();
 142         for ( size_t n = 0; n < count; n++ )
 143         {
 144             delete GetClientObject(n);
 145         }
 146     }
 147 }
 148
 149 // ----------------------------------------------------------------------------
 150 // selection
 151 // ----------------------------------------------------------------------------
 152
 153 int wxChoice::GetSelection() const
 154 {
 155     return (int)SendMessage(GetHwnd(), CB_GETCURSEL, 0, 0);
 156 }
 157
 158 void wxChoice::SetSelection(int n)
 159 {
 160     SendMessage(GetHwnd(), CB_SETCURSEL, n, 0);
 161 }
 162
 163 // ----------------------------------------------------------------------------
 164 // string list functions
 165 // ----------------------------------------------------------------------------
 166
 167 int wxChoice::GetCount() const
 168 {
 169     return (int)SendMessage(GetHwnd(), CB_GETCOUNT, 0, 0);
 170 }
 171
 172 int wxChoice::FindString(const wxString& s) const
 173 {
 174 #if defined(__WATCOMC__) && defined(__WIN386__)
 175     // For some reason, Watcom in WIN386 mode crashes in the CB_FINDSTRINGEXACT message.
 176     // wxChoice::Do it the long way instead.
 177     int count = GetCount();
 178     for ( int i = 0; i < count; i++ )
 179     {
 180         // as CB_FINDSTRINGEXACT is case insensitive, be case insensitive too
 181         if ( GetString(i).IsSameAs(s, FALSE) )
 182             return i;
 183     }
 184
 185     return wxNOT_FOUND;
 186 #else // !Watcom
 187     int pos = (int)SendMessage(GetHwnd(), CB_FINDSTRINGEXACT,
 188                                (WPARAM)-1, (LPARAM)s.c_str());
 189
 190     return pos == LB_ERR ? wxNOT_FOUND : pos;
 191 #endif // Watcom/!Watcom
 192 }
 193
 194 void wxChoice::SetString(int n, const wxString& s)
 195 {
 196     wxCHECK_RET( n >= 0 && n < GetCount(),
 197                  wxT("invalid item index in wxChoice::SetString") );
 198
 199     // we have to delete and add back the string as there is no way to change a
 200     // string in place
 201
 202     // we need to preserve the client data
 203     void *data;
 204     if ( m_clientDataItemsType != wxClientData_None )
 205     {
 206         data = DoGetItemClientData(n);
 207     }
 208     else // no client data
 209     {
 210         data = NULL;
 211     }
 212
 213     ::SendMessage(GetHwnd(), CB_DELETESTRING, n, 0);
 214     ::SendMessage(GetHwnd(), CB_INSERTSTRING, n, (LPARAM)s.c_str() );
 215
 216     if ( data )
 217     {
 218         DoSetItemClientData(n, data);
 219     }
 220     //else: it's already NULL by default
 221 }
 222
 223 wxString wxChoice::GetString(int n) const
 224 {
 225     int len = (int)::SendMessage(GetHwnd(), CB_GETLBTEXTLEN, n, 0);
 226
 227     wxString str;
 228     if ( len != CB_ERR && len > 0 )
 229     {
 230         if ( ::SendMessage
 231                (
 232                 GetHwnd(),
 233                 CB_GETLBTEXT,
 234                 n,
 235                 (LPARAM)(wxChar *)wxStringBuffer(str, len)
 236                ) == CB_ERR )
 237         {
 238             wxLogLastError(wxT("SendMessage(CB_GETLBTEXT)"));
 239         }
 240
 241         str.UngetWriteBuf();
 242     }
 243
 244     return str;
 245 }
 246
 247 // ----------------------------------------------------------------------------
 248 // client data
 249 // ----------------------------------------------------------------------------
 250
 251 void wxChoice::DoSetItemClientData( int n, void* clientData )
 252 {
 253     if ( ::SendMessage(GetHwnd(), CB_SETITEMDATA,
 254                        n, (LPARAM)clientData) == CB_ERR )
 255     {
 256         wxLogLastError(wxT("CB_SETITEMDATA"));
 257     }
 258 }
 259
 260 void* wxChoice::DoGetItemClientData( int n ) const
 261 {
 262     LPARAM rc = SendMessage(GetHwnd(), CB_GETITEMDATA, n, 0);
 263     if ( rc == CB_ERR )
 264     {
 265         wxLogLastError(wxT("CB_GETITEMDATA"));
 266
 267         // unfortunately, there is no way to return an error code to the user
 268         rc = (LPARAM) NULL;
 269     }
 270
 271     return (void *)rc;
 272 }
 273
 274 void wxChoice::DoSetItemClientObject( int n, wxClientData* clientData )
 275 {
 276     DoSetItemClientData(n, clientData);
 277 }
 278
 279 wxClientData* wxChoice::DoGetItemClientObject( int n ) const
 280 {
 281     return (wxClientData *)DoGetItemClientData(n);
 282 }
 283
 284 // ----------------------------------------------------------------------------
 285 // wxMSW specific helpers
 286 // ----------------------------------------------------------------------------
 287
 288 void wxChoice::DoMoveWindow(int x, int y, int width, int height)
 289 {
 290     // here is why this is necessary: if the width is negative, the combobox
 291     // window proc makes the window of the size width*height instead of
 292     // interpreting height in the usual manner (meaning the height of the drop
 293     // down list - usually the height specified in the call to MoveWindow()
 294     // will not change the height of combo box per se)
 295     //
 296     // this behaviour is not documented anywhere, but this is just how it is
 297     // here (NT 4.4) and, anyhow, the check shouldn't hurt - however without
 298     // the check, constraints/sizers using combos may break the height
 299     // constraint will have not at all the same value as expected
 300     if ( width < 0 )
 301         return;
 302
 303     wxControl::DoMoveWindow(x, y, width, height);
 304 }
 305
 306 void wxChoice::DoSetSize(int x, int y,
 307                          int width, int WXUNUSED(height),
 308                          int sizeFlags)
 309 {
 310     // Ignore height parameter because height doesn't mean 'initially
 311     // displayed' height, it refers to the drop-down menu as well. The
 312     // wxWindows interpretation is different; also, getting the size returns
 313     // the _displayed_ size (NOT the drop down menu size) so
 314     // setting-getting-setting size would not work.
 315
 316     wxControl::DoSetSize(x, y, width, -1, sizeFlags);
 317 }
 318
 319 wxSize wxChoice::DoGetBestSize() const
 320 {
 321     // find the widest string
 322     int wLine;
 323     int wChoice = 0;
 324     int nItems = GetCount();
 325     for ( int i = 0; i < nItems; i++ )
 326     {
 327         wxString str(GetString(i));
 328         GetTextExtent(str, &wLine, NULL);
 329         if ( wLine > wChoice )
 330             wChoice = wLine;
 331     }
 332
 333     // give it some reasonable default value if there are no strings in the
 334     // list
 335     if ( wChoice == 0 )
 336         wChoice = 100;
 337
 338     // the combobox should be larger than the widest string
 339     int cx, cy;
 340     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 341
 342     wChoice += 5*cx;
 343
 344     // Choice drop-down list depends on number of items (limited to 10)
 345     size_t nStrings = nItems == 0 ? 10 : wxMin(10, nItems) + 1;
 346     int hChoice = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*nStrings;
 347
 348     return wxSize(wChoice, hChoice);
 349 }
 350
 351 long wxChoice::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 352 {
 353     if ( nMsg == WM_LBUTTONUP )
 354     {
 355         int x = (int)LOWORD(lParam);
 356         int y = (int)HIWORD(lParam);
 357
 358         // Ok, this is truly weird, but if a panel with a wxChoice loses the
 359         // focus, then you get a *fake* WM_LBUTTONUP message with x = 65535 and
 360         // y = 65535. Filter out this nonsense.
 361         //
 362         // VZ: I'd like to know how to reproduce this please...
 363         if ( x == 65535 && y == 65535 )
 364             return 0;
 365     }
 366
 367     return wxWindow::MSWWindowProc(nMsg, wParam, lParam);
 368 }
 369
 370 bool wxChoice::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 371 {
 372     if ( param != CBN_SELCHANGE)
 373     {
 374         // "selection changed" is the only event we're after
 375         return FALSE;
 376     }
 377
 378     int n = GetSelection();
 379     if (n > -1)
 380     {
 381         wxCommandEvent event(wxEVT_COMMAND_CHOICE_SELECTED, m_windowId);
 382         event.SetInt(n);
 383         event.SetEventObject(this);
 384         event.SetString(GetStringSelection());
 385         if ( HasClientObjectData() )
 386             event.SetClientObject( GetClientObject(n) );
 387         else if ( HasClientUntypedData() )
 388             event.SetClientData( GetClientData(n) );
 389         ProcessCommand(event);
 390     }
 391
 392     return TRUE;
 393 }
 394
 395 WXHBRUSH wxChoice::OnCtlColor(WXHDC pDC, WXHWND WXUNUSED(pWnd), WXUINT WXUNUSED(nCtlColor),
 396                                WXUINT WXUNUSED(message),
 397                                WXWPARAM WXUNUSED(wParam),
 398                                WXLPARAM WXUNUSED(lParam)
 399      )
 400 {
 401     HDC hdc = (HDC)pDC;
 402     if (GetParent()->GetTransparentBackground())
 403         SetBkMode(hdc, TRANSPARENT);
 404     else
 405         SetBkMode(hdc, OPAQUE);
 406
 407     wxColour colBack = GetBackgroundColour();
 408
 409     if (!IsEnabled())
 410         colBack = wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE);
 411
 412     ::SetBkColor(hdc, wxColourToRGB(colBack));
 413     ::SetTextColor(hdc, wxColourToRGB(GetForegroundColour()));
 414
 415     wxBrush *brush = wxTheBrushList->FindOrCreateBrush(colBack, wxSOLID);
 416
 417     return (WXHBRUSH)brush->GetResourceHandle();
 418 }
 419
 420 #endif // wxUSE_CHOICE