src/msw/radiobut.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/radiobut.cpp
   3 // Purpose:     wxRadioButton
   4 // Author:      Julian Smart
   5 // Modified by:
   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 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #if wxUSE_RADIOBTN
  28
  29 #include "wx/radiobut.h"
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/settings.h"
  33     #include "wx/dcscreen.h"
  34     #include "wx/toplevel.h"
  35 #endif
  36
  37 #include "wx/msw/private.h"
  38
  39 // ============================================================================
  40 // wxRadioButton implementation
  41 // ============================================================================
  42
  43 // ----------------------------------------------------------------------------
  44 // wxRadioButton creation
  45 // ----------------------------------------------------------------------------
  46
  47 void wxRadioButton::Init()
  48 {
  49     m_isChecked = false;
  50 }
  51
  52 bool wxRadioButton::Create(wxWindow *parent,
  53                            wxWindowID id,
  54                            const wxString& label,
  55                            const wxPoint& pos,
  56                            const wxSize& size,
  57                            long style,
  58                            const wxValidator& validator,
  59                            const wxString& name)
  60 {
  61     if ( !CreateControl(parent, id, pos, size, style, validator, name) )
  62         return false;
  63
  64     WXDWORD exstyle = 0;
  65     WXDWORD msStyle = MSWGetStyle(style, &exstyle);
  66
  67     if ( !MSWCreateControl(wxT("BUTTON"), msStyle, pos, size, label, exstyle) )
  68         return false;
  69
  70     // for compatibility with wxGTK, the first radio button in a group is
  71     // always checked (this makes sense anyhow as you need to ensure that at
  72     // least one button in the group is checked and this is the simplest way to
  73     // do it)
  74     if ( HasFlag(wxRB_GROUP) )
  75         SetValue(true);
  76
  77     return true;
  78 }
  79
  80 // ----------------------------------------------------------------------------
  81 // wxRadioButton functions
  82 // ----------------------------------------------------------------------------
  83
  84 void wxRadioButton::SetValue(bool value)
  85 {
  86     ::SendMessage(GetHwnd(), BM_SETCHECK,
  87                   value ? BST_CHECKED : BST_UNCHECKED, 0);
  88
  89     m_isChecked = value;
  90
  91     if ( !value )
  92         return;
  93
  94     // if we set the value of one radio button we also must clear all the other
  95     // buttons in the same group: Windows doesn't do it automatically
  96     //
  97     // moreover, if another radiobutton in the group currently has the focus,
  98     // we have to set it to this radiobutton, else the old radiobutton will be
  99     // reselected automatically, if a parent window loses the focus and regains
 100     // it.
 101     wxWindow * const focus = FindFocus();
 102     wxTopLevelWindow * const
 103         tlw = wxDynamicCast(wxGetTopLevelParent(this), wxTopLevelWindow);
 104     wxCHECK_RET( tlw, wxT("radio button outside of TLW?") );
 105     wxWindow * const focusInTLW = tlw->GetLastFocus();
 106
 107     const wxWindowList& siblings = GetParent()->GetChildren();
 108     wxWindowList::compatibility_iterator nodeThis = siblings.Find(this);
 109     wxCHECK_RET( nodeThis, wxT("radio button not a child of its parent?") );
 110
 111     // this will be set to true in the code below if the focus is in our TLW
 112     // and belongs to one of the other buttons in the same group
 113     bool shouldSetFocus = false;
 114
 115     // this will be set to true if the focus is outside of our TLW currently
 116     // but the remembered focus of this TLW is one of the other buttons in the
 117     // same group
 118     bool shouldSetTLWFocus = false;
 119
 120     // if it's not the first item of the group ...
 121     if ( !HasFlag(wxRB_GROUP) )
 122     {
 123         // ... turn off all radio buttons before it
 124         for ( wxWindowList::compatibility_iterator nodeBefore = nodeThis->GetPrevious();
 125               nodeBefore;
 126               nodeBefore = nodeBefore->GetPrevious() )
 127         {
 128             wxRadioButton *btn = wxDynamicCast(nodeBefore->GetData(),
 129                                                wxRadioButton);
 130             if ( !btn )
 131             {
 132                 // don't stop on non radio buttons, we could have intermixed
 133                 // buttons and e.g. static labels
 134                 continue;
 135             }
 136
 137             if ( btn->HasFlag(wxRB_SINGLE) )
 138                 {
 139                     // A wxRB_SINGLE button isn't part of this group
 140                     break;
 141                 }
 142
 143             if ( btn == focus )
 144                 shouldSetFocus = true;
 145             else if ( btn == focusInTLW )
 146                 shouldSetTLWFocus = true;
 147
 148             btn->SetValue(false);
 149
 150             if ( btn->HasFlag(wxRB_GROUP) )
 151             {
 152                 // even if there are other radio buttons before this one,
 153                 // they're not in the same group with us
 154                 break;
 155             }
 156         }
 157     }
 158
 159     // ... and also turn off all buttons after this one
 160     for ( wxWindowList::compatibility_iterator nodeAfter = nodeThis->GetNext();
 161           nodeAfter;
 162           nodeAfter = nodeAfter->GetNext() )
 163     {
 164         wxRadioButton *btn = wxDynamicCast(nodeAfter->GetData(),
 165                                            wxRadioButton);
 166
 167         if ( !btn )
 168             continue;
 169
 170         if ( btn->HasFlag(wxRB_GROUP | wxRB_SINGLE) )
 171         {
 172             // no more buttons or the first button of the next group
 173             break;
 174         }
 175
 176         if ( btn == focus )
 177             shouldSetFocus = true;
 178         else if ( btn == focusInTLW )
 179             shouldSetTLWFocus = true;
 180
 181         btn->SetValue(false);
 182     }
 183
 184     if ( shouldSetFocus )
 185         SetFocus();
 186     else if ( shouldSetTLWFocus )
 187         tlw->SetLastFocus(this);
 188 }
 189
 190 bool wxRadioButton::GetValue() const
 191 {
 192     wxASSERT_MSG( m_isChecked ==
 193                     (::SendMessage(GetHwnd(), BM_GETCHECK, 0, 0L) != 0),
 194                   wxT("wxRadioButton::m_isChecked is out of sync?") );
 195
 196     return m_isChecked;
 197 }
 198
 199 // ----------------------------------------------------------------------------
 200 // wxRadioButton event processing
 201 // ----------------------------------------------------------------------------
 202
 203 void wxRadioButton::Command (wxCommandEvent& event)
 204 {
 205     SetValue(event.GetInt() != 0);
 206     ProcessCommand(event);
 207 }
 208
 209 bool wxRadioButton::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 210 {
 211     if ( param != BN_CLICKED )
 212         return false;
 213
 214     if ( !m_isChecked )
 215     {
 216         // we need to manually update the button state as we use BS_RADIOBUTTON
 217         // and not BS_AUTORADIOBUTTON
 218         SetValue(true);
 219
 220         wxCommandEvent event(wxEVT_COMMAND_RADIOBUTTON_SELECTED, GetId());
 221         event.SetEventObject( this );
 222         event.SetInt(true); // always checked
 223
 224         ProcessCommand(event);
 225     }
 226
 227     return true;
 228 }
 229
 230 // ----------------------------------------------------------------------------
 231 // wxRadioButton geometry
 232 // ----------------------------------------------------------------------------
 233
 234 wxSize wxRadioButton::DoGetBestSize() const
 235 {
 236     static int s_radioSize = 0;
 237
 238     if ( !s_radioSize )
 239     {
 240         wxScreenDC dc;
 241         dc.SetFont(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));
 242
 243         s_radioSize = dc.GetCharHeight();
 244
 245         // radio button bitmap size under CE is bigger than the font height,
 246         // adding just one pixel seems to work fine for the default font but it
 247         // would be nice to find some better way to find the correct height
 248 #ifdef __WXWINCE__
 249         s_radioSize++;
 250 #endif // __WXWINCE__
 251     }
 252
 253     wxString str = GetLabel();
 254
 255     int wRadio, hRadio;
 256     if ( !str.empty() )
 257     {
 258         GetTextExtent(GetLabelText(str), &wRadio, &hRadio);
 259         wRadio += s_radioSize + GetCharWidth();
 260
 261         if ( hRadio < s_radioSize )
 262             hRadio = s_radioSize;
 263     }
 264     else
 265     {
 266         wRadio = s_radioSize;
 267         hRadio = s_radioSize;
 268     }
 269
 270     wxSize best(wRadio, hRadio);
 271     CacheBestSize(best);
 272     return best;
 273 }
 274
 275 WXDWORD wxRadioButton::MSWGetStyle(long style, WXDWORD *exstyle) const
 276 {
 277     WXDWORD msStyle = wxControl::MSWGetStyle(style, exstyle);
 278
 279     if ( HasFlag(wxRB_GROUP) )
 280         msStyle |= WS_GROUP;
 281
 282     // we use BS_RADIOBUTTON and not BS_AUTORADIOBUTTON because the use of the
 283     // latter can easily result in the application entering an infinite loop
 284     // inside IsDialogMessage()
 285     //
 286     // we used to use BS_RADIOBUTTON only for wxRB_SINGLE buttons but there
 287     // doesn't seem to be any harm to always use it and it prevents some hangs,
 288     // see #9786
 289     msStyle |= BS_RADIOBUTTON;
 290
 291     if ( style & wxCLIP_SIBLINGS )
 292         msStyle |= WS_CLIPSIBLINGS;
 293     if ( style & wxALIGN_RIGHT )
 294         msStyle |= BS_LEFTTEXT | BS_RIGHT;
 295
 296
 297     return msStyle;
 298 }
 299
 300 #endif // wxUSE_RADIOBTN