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 and Markus Holzem
   9 // Licence:     wxWindows license
  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 #ifndef WX_PRECOMP
  32     #include "wx/choice.h"
  33     #include "wx/utils.h"
  34     #include "wx/log.h"
  35 #endif
  36
  37 #include "wx/msw/private.h"
  38
  39 #if !USE_SHARED_LIBRARY
  40     IMPLEMENT_DYNAMIC_CLASS(wxChoice, wxControl)
  41 #endif
  42
  43 // ============================================================================
  44 // implementation
  45 // ============================================================================
  46
  47 // ----------------------------------------------------------------------------
  48 // creation
  49 // ----------------------------------------------------------------------------
  50
  51 bool wxChoice::Create(wxWindow *parent,
  52                       wxWindowID id,
  53                       const wxPoint& pos,
  54                       const wxSize& size,
  55                       int n, const wxString choices[],
  56                       long style,
  57                       const wxValidator& validator,
  58                       const wxString& name)
  59 {
  60     if ( !CreateControl(parent, id, pos, size, style, validator, name) )
  61         return FALSE;
  62
  63     long msStyle = WS_CHILD | CBS_DROPDOWNLIST | WS_TABSTOP | WS_VISIBLE | WS_HSCROLL | WS_VSCROLL;
  64     if ( style & wxCB_SORT )
  65         msStyle |= CBS_SORT;
  66
  67     // the experience shows that wxChoice vs. wxComboBox distinction confuses
  68     // quite a few people - try to help them
  69     wxASSERT_MSG( !(style & wxCB_DROPDOWN) &&
  70                   !(style & wxCB_READONLY) &&
  71                   !(style & wxCB_SIMPLE),
  72                   wxT("this style flag is ignored by wxChoice, you "
  73                      "probably want to use a wxComboBox") );
  74
  75     if ( !MSWCreateControl(wxT("COMBOBOX"), msStyle) )
  76         return FALSE;
  77
  78     for ( int i = 0; i < n; i++ )
  79     {
  80         Append(choices[i]);
  81     }
  82
  83     SetSize(pos.x, pos.y, size.x, size.y);
  84
  85     return TRUE;
  86 }
  87
  88 // ----------------------------------------------------------------------------
  89 // adding/deleting items to/from the list
  90 // ----------------------------------------------------------------------------
  91
  92 int wxChoice::DoAppend(const wxString& item)
  93 {
  94     int n = (int)SendMessage(GetHwnd(), CB_ADDSTRING, 0, (LONG)item.c_str());
  95     if ( n == CB_ERR )
  96     {
  97         wxLogLastError("SendMessage(CB_ADDSTRING)");
  98     }
  99
 100     return n;
 101 }
 102
 103 void wxChoice::Delete(int n)
 104 {
 105     wxCHECK_RET( n < GetCount(), wxT("invalid item index in wxChoice::Delete") );
 106
 107     SendMessage(GetHwnd(), CB_DELETESTRING, n, 0);
 108 }
 109
 110 void wxChoice::Clear()
 111 {
 112     SendMessage(GetHwnd(), CB_RESETCONTENT, 0, 0);
 113 }
 114
 115 // ----------------------------------------------------------------------------
 116 // selection
 117 // ----------------------------------------------------------------------------
 118
 119 int wxChoice::GetSelection() const
 120 {
 121     return (int)SendMessage(GetHwnd(), CB_GETCURSEL, 0, 0);
 122 }
 123
 124 void wxChoice::SetSelection(int n)
 125 {
 126     SendMessage(GetHwnd(), CB_SETCURSEL, n, 0);
 127 }
 128
 129 // ----------------------------------------------------------------------------
 130 // string list functions
 131 // ----------------------------------------------------------------------------
 132
 133 int wxChoice::GetCount() const
 134 {
 135     return (int)SendMessage(GetHwnd(), CB_GETCOUNT, 0, 0);
 136 }
 137
 138 int wxChoice::FindString(const wxString& s) const
 139 {
 140 #if defined(__WATCOMC__) && defined(__WIN386__)
 141     // For some reason, Watcom in WIN386 mode crashes in the CB_FINDSTRINGEXACT message.
 142     // wxChoice::Do it the long way instead.
 143     int count = GetCount();
 144     for ( int i = 0; i < count; i++ )
 145     {
 146         // as CB_FINDSTRINGEXACT is case insensitive, be case insensitive too
 147         if ( GetString(i).IsSameAs(s, FALSE) )
 148             return i;
 149     }
 150
 151     return wxNOT_FOUND;
 152 #else // !Watcom
 153     int pos = (int)SendMessage(GetHwnd(), CB_FINDSTRINGEXACT,
 154                                (WPARAM)-1, (LPARAM)s.c_str());
 155
 156     return pos == LB_ERR ? wxNOT_FOUND : pos;
 157 #endif // Watcom/!Watcom
 158 }
 159
 160 wxString wxChoice::GetString(int n) const
 161 {
 162     size_t len = (size_t)::SendMessage(GetHwnd(), CB_GETLBTEXTLEN, n, 0);
 163     wxString str = "";
 164     if (len) {
 165         if ( ::SendMessage(GetHwnd(), CB_GETLBTEXT, n,
 166                            (LPARAM)str.GetWriteBuf(len)) == CB_ERR ) {
 167             wxLogLastError("SendMessage(CB_GETLBTEXT)");
 168         }
 169         str.UngetWriteBuf();
 170     }
 171
 172     return str;
 173 }
 174
 175 // ----------------------------------------------------------------------------
 176 // client data
 177 // ----------------------------------------------------------------------------
 178
 179 void wxChoice::DoSetClientData( int n, void* clientData )
 180 {
 181     if ( SendMessage(GetHwnd(), CB_SETITEMDATA, n, (LPARAM)clientData) == CB_ERR )
 182     {
 183         wxLogLastError(wxT("CB_SETITEMDATA"));
 184     }
 185 }
 186
 187 void* wxChoice::DoGetClientData( int n ) const
 188 {
 189     LPARAM rc = SendMessage(GetHwnd(), CB_GETITEMDATA, n, 0);
 190     if ( rc == CB_ERR )
 191     {
 192         wxLogLastError(wxT("CB_GETITEMDATA"));
 193
 194         // unfortunately, there is no way to return an error code to the user
 195         rc = (LPARAM) NULL;
 196     }
 197
 198     return (void *)rc;
 199 }
 200
 201 void wxChoice::DoSetClientObject( int n, wxClientData* clientData )
 202 {
 203     DoSetClientData(n, clientData);
 204 }
 205
 206 wxClientData* wxChoice::DoGetClientObject( int n ) const
 207 {
 208     return (wxClientData *)DoGetClientData(n);
 209 }
 210
 211 // ----------------------------------------------------------------------------
 212 // wxMSW specific helpers
 213 // ----------------------------------------------------------------------------
 214
 215 void wxChoice::DoSetSize(int x, int y,
 216                          int width, int height,
 217                          int sizeFlags)
 218 {
 219     // Ignore height parameter because height doesn't mean 'initially
 220     // displayed' height, it refers to the drop-down menu as well. The
 221     // wxWindows interpretation is different; also, getting the size returns
 222     // the _displayed_ size (NOT the drop down menu size) so
 223     // setting-getting-setting size would not work.
 224     wxControl::DoSetSize(x, y, width, -1, sizeFlags);
 225 }
 226
 227 wxSize wxChoice::DoGetBestSize()
 228 {
 229     // find the widest string
 230     int wLine;
 231     int wChoice = 0;
 232     int nItems = GetCount();
 233     for ( int i = 0; i < nItems; i++ )
 234     {
 235         wxString str(GetString(i));
 236         GetTextExtent(str, &wLine, NULL);
 237         if ( wLine > wChoice )
 238             wChoice = wLine;
 239     }
 240
 241     // give it some reasonable default value if there are no strings in the
 242     // list
 243     if ( wChoice == 0 )
 244         wChoice = 100;
 245
 246     // the combobox should be larger than the widest string
 247     int cx, cy;
 248     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 249
 250     wChoice += 5*cx;
 251
 252     // Choice drop-down list depends on number of items (limited to 10)
 253     size_t nStrings = nItems == 0 ? 10 : wxMin(10, nItems) + 1;
 254     int hChoice = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*nStrings;
 255
 256     return wxSize(wChoice, hChoice);
 257 }
 258
 259 long wxChoice::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 260 {
 261     if ( nMsg == WM_LBUTTONUP )
 262     {
 263         int x = (int)LOWORD(lParam);
 264         int y = (int)HIWORD(lParam);
 265
 266         // Ok, this is truly weird, but if a panel with a wxChoice loses the
 267         // focus, then you get a *fake* WM_LBUTTONUP message with x = 65535 and
 268         // y = 65535. Filter out this nonsense.
 269         //
 270         // VZ: I'd like to know how to reproduce this please...
 271         if ( x == 65535 && y == 65535 )
 272             return 0;
 273     }
 274
 275     return wxWindow::MSWWindowProc(nMsg, wParam, lParam);
 276 }
 277
 278 bool wxChoice::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 279 {
 280     if ( param != CBN_SELCHANGE)
 281     {
 282         // "selection changed" is the only event we're after
 283         return FALSE;
 284     }
 285
 286     wxCommandEvent event(wxEVT_COMMAND_CHOICE_SELECTED, m_windowId);
 287     event.SetInt(GetSelection());
 288     event.SetEventObject(this);
 289     event.SetString(GetStringSelection());
 290     ProcessCommand(event);
 291
 292     return TRUE;
 293 }
 294