src/msw/radiobut.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 #ifdef __GNUG__
  21 #pragma implementation "radiobut.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_RADIOBTN
  32
  33 #ifndef WX_PRECOMP
  34 #include "wx/radiobut.h"
  35 #include "wx/settings.h"
  36 #include "wx/brush.h"
  37 #include "wx/dcscreen.h"
  38 #endif
  39
  40 #include "wx/msw/private.h"
  41
  42 // ============================================================================
  43 // wxRadioButton implementation
  44 // ============================================================================
  45
  46 // ----------------------------------------------------------------------------
  47 // wxRadioButton creation
  48 // ----------------------------------------------------------------------------
  49
  50 IMPLEMENT_DYNAMIC_CLASS(wxRadioButton, wxControl)
  51
  52 void wxRadioButton::Init()
  53 {
  54     m_focusJustSet = FALSE;
  55 }
  56
  57 bool wxRadioButton::Create(wxWindow *parent,
  58                            wxWindowID id,
  59                            const wxString& label,
  60                            const wxPoint& pos,
  61                            const wxSize& size,
  62                            long style,
  63                            const wxValidator& validator,
  64                            const wxString& name)
  65 {
  66     if ( !CreateControl(parent, id, pos, size, style, validator, name) )
  67         return FALSE;
  68
  69     long msStyle = WS_TABSTOP;
  70     if ( HasFlag(wxRB_GROUP) )
  71         msStyle |= WS_GROUP;
  72
  73     /*
  74        wxRB_SINGLE is a temporary workaround for the following problem: if you
  75        have 2 radiobuttons in the same group but which are not consecutive in
  76        the dialog, Windows can enter an infinite loop! The simplest way to
  77        reproduce it is to create radio button, then a panel and then another
  78        radio button: then checking the last button hangs the app.
  79
  80        Ideally, we'd detect (and avoid) such situation automatically but for
  81        now, as I don't know how to do it, just allow the user to create
  82        BS_RADIOBUTTON buttons for such situations.
  83      */
  84     msStyle |= HasFlag(wxRB_SINGLE) ? BS_RADIOBUTTON : BS_AUTORADIOBUTTON;
  85
  86     if ( HasFlag(wxCLIP_SIBLINGS) )
  87         msStyle |= WS_CLIPSIBLINGS;
  88
  89     if ( !MSWCreateControl(_T("BUTTON"), msStyle, pos, size, label, 0) )
  90         return FALSE;
  91
  92     // for compatibility with wxGTK, the first radio button in a group is
  93     // always checked (this makes sense anyhow as you need to ensure that at
  94     // least one button in the group is checked and this is the simlpest way to
  95     // do it)
  96     if ( HasFlag(wxRB_GROUP) )
  97         SetValue(TRUE);
  98
  99     return TRUE;
 100 }
 101
 102 // ----------------------------------------------------------------------------
 103 // wxRadioButton functions
 104 // ----------------------------------------------------------------------------
 105
 106 void wxRadioButton::SetValue(bool value)
 107 {
 108     // BST_CHECKED is defined as 1, BST_UNCHECKED as 0, so we can just pass
 109     // value as is (we don't use BST_XXX here as they're not defined for Win16)
 110     (void)::SendMessage(GetHwnd(), BM_SETCHECK, (WPARAM)value, 0L);
 111
 112     // if we set the value of one radio button we also must clear all the other
 113     // buttons in the same group: Windows doesn't do it automatically
 114     if ( value )
 115     {
 116         const wxWindowList& siblings = GetParent()->GetChildren();
 117         wxWindowList::Node *nodeThis = siblings.Find(this);
 118         wxCHECK_RET( nodeThis, _T("radio button not a child of its parent?") );
 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::Node *nodeBefore = nodeThis->GetPrevious();
 125                   nodeBefore;
 126                   nodeBefore = nodeBefore->GetPrevious() )
 127             {
 128                 wxRadioButton *btn = wxDynamicCast(nodeBefore->GetData(),
 129                                                    wxRadioButton);
 130                 if ( !btn )
 131                 {
 132                     // the radio buttons in a group must be consecutive, so
 133                     // there are no more of them
 134                     break;
 135                 }
 136
 137                 btn->SetValue(FALSE);
 138
 139                 if ( btn->HasFlag(wxRB_GROUP) )
 140                 {
 141                     // even if there are other radio buttons before this one,
 142                     // they're not in the same group with us
 143                     break;
 144                 }
 145             }
 146         }
 147
 148         // ... and also turn off all buttons after this one
 149         for ( wxWindowList::Node *nodeAfter = nodeThis->GetNext();
 150               nodeAfter;
 151               nodeAfter = nodeAfter->GetNext() )
 152         {
 153             wxRadioButton *btn = wxDynamicCast(nodeAfter->GetData(),
 154                                                wxRadioButton);
 155
 156             if ( !btn || btn->HasFlag(wxRB_GROUP) )
 157             {
 158                 // no more buttons or the first button of the next group
 159                 break;
 160             }
 161
 162             btn->SetValue(FALSE);
 163         }
 164     }
 165 }
 166
 167 bool wxRadioButton::GetValue() const
 168 {
 169     // NB: this will also return TRUE for BST_INDETERMINATE value if we ever
 170     //     have 3-state radio buttons
 171     return ::SendMessage(GetHwnd(), BM_GETCHECK, 0, 0L) != 0;
 172 }
 173
 174 // ----------------------------------------------------------------------------
 175 // wxRadioButton event processing
 176 // ----------------------------------------------------------------------------
 177
 178 void wxRadioButton::Command (wxCommandEvent& event)
 179 {
 180     SetValue(event.m_commandInt != 0);
 181     ProcessCommand(event);
 182 }
 183
 184 void wxRadioButton::SetFocus()
 185 {
 186     // when the radio button receives a WM_SETFOCUS message it generates a
 187     // BN_CLICKED which is totally unexpected and leads to catastrophic results
 188     // if you pop up a dialog from the radio button event handler as, when the
 189     // dialog is dismissed, the focus is returned to the radio button which
 190     // generates BN_CLICKED which leads to showing another dialog and so on
 191     // without end!
 192     //
 193     // to avoid this, we drop the pseudo BN_CLICKED events generated when the
 194     // button gains focus
 195     m_focusJustSet = TRUE;
 196
 197     wxControl::SetFocus();
 198 }
 199
 200 bool wxRadioButton::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 201 {
 202     if ( param != BN_CLICKED )
 203         return FALSE;
 204
 205     if ( m_focusJustSet )
 206     {
 207         // see above: we want to ignore this event
 208         m_focusJustSet = FALSE;
 209     }
 210     else // a real clicked event
 211     {
 212         bool isChecked = GetValue();
 213
 214         if ( HasFlag(wxRB_SINGLE) )
 215         {
 216             // when we use a "manual" radio button, we have to check the button
 217             // ourselves -- but it's reset to unchecked state by the user code
 218             // (presumably when another button is pressed)
 219             if ( !isChecked )
 220                 SetValue(TRUE);
 221         }
 222
 223         wxCommandEvent event(wxEVT_COMMAND_RADIOBUTTON_SELECTED, GetId());
 224         event.SetEventObject( this );
 225         event.SetInt(isChecked);
 226
 227         ProcessCommand(event);
 228     }
 229
 230     return TRUE;
 231 }
 232
 233 // ----------------------------------------------------------------------------
 234 // wxRadioButton geometry
 235 // ----------------------------------------------------------------------------
 236
 237 wxSize wxRadioButton::DoGetBestSize() const
 238 {
 239     static int s_radioSize = 0;
 240
 241     if ( !s_radioSize )
 242     {
 243         wxScreenDC dc;
 244         dc.SetFont(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));
 245
 246         s_radioSize = dc.GetCharHeight();
 247     }
 248
 249     wxString str = GetLabel();
 250
 251     int wRadio, hRadio;
 252     if ( !str.empty() )
 253     {
 254         GetTextExtent(str, &wRadio, &hRadio);
 255         wRadio += s_radioSize + GetCharWidth();
 256
 257         if ( hRadio < s_radioSize )
 258             hRadio = s_radioSize;
 259     }
 260     else
 261     {
 262         wRadio = s_radioSize;
 263         hRadio = s_radioSize;
 264     }
 265
 266     return wxSize(wRadio, hRadio);
 267 }
 268
 269 long wxRadioButton::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 270 {
 271     if (nMsg == WM_SETFOCUS)
 272     {
 273         m_focusJustSet = TRUE;
 274
 275         long ret = wxControl::MSWWindowProc(nMsg, wParam, lParam);
 276
 277         m_focusJustSet = FALSE;
 278
 279         return ret;
 280     }
 281     return wxControl::MSWWindowProc(nMsg, wParam, lParam);
 282 }
 283
 284 #endif // wxUSE_RADIOBTN