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 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 "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 #endif
  38
  39 #include "wx/msw/private.h"
  40
  41 // ============================================================================
  42 // wxRadioButton implementation
  43 // ============================================================================
  44
  45 // ----------------------------------------------------------------------------
  46 // wxRadioButton creation
  47 // ----------------------------------------------------------------------------
  48
  49 IMPLEMENT_DYNAMIC_CLASS(wxRadioButton, wxControl)
  50
  51 void wxRadioButton::Init()
  52 {
  53     m_focusJustSet = FALSE;
  54 }
  55
  56 bool wxRadioButton::Create(wxWindow *parent,
  57                            wxWindowID id,
  58                            const wxString& label,
  59                            const wxPoint& pos,
  60                            const wxSize& size,
  61                            long style,
  62                            const wxValidator& validator,
  63                            const wxString& name)
  64 {
  65     if ( !CreateControl(parent, id, pos, size, style, validator, name) )
  66         return FALSE;
  67
  68     long msStyle = HasFlag(wxRB_GROUP) ? WS_GROUP : 0;
  69
  70     msStyle |= BS_AUTORADIOBUTTON;
  71
  72     if ( HasFlag(wxCLIP_SIBLINGS) )
  73         msStyle |= WS_CLIPSIBLINGS;
  74
  75     if ( !MSWCreateControl(_T("BUTTON"), msStyle, pos, size, label, 0) )
  76         return FALSE;
  77
  78     // for compatibility with wxGTK, the first radio button in a group is
  79     // always checked (this makes sense anyhow as you need to ensure that at
  80     // least one button in the group is checked and this is the simlpest way to
  81     // do it)
  82     if ( HasFlag(wxRB_GROUP) )
  83         SetValue(TRUE);
  84
  85     return TRUE;
  86 }
  87
  88 // ----------------------------------------------------------------------------
  89 // wxRadioButton functions
  90 // ----------------------------------------------------------------------------
  91
  92 void wxRadioButton::SetValue(bool value)
  93 {
  94     // BST_CHECKED is defined as 1, BST_UNCHECKED as 0, so we can just pass
  95     // value as is (we don't sue BST_XXX here as they're not defined for Win16)
  96     (void)::SendMessage(GetHwnd(), BM_SETCHECK, (WPARAM)value, 0L);
  97 }
  98
  99 bool wxRadioButton::GetValue() const
 100 {
 101     // NB: this will also return TRUE for BST_INDETERMINATE value if we ever
 102     //     have 3-state radio buttons
 103     return ::SendMessage(GetHwnd(), BM_GETCHECK, 0, 0L) != 0;
 104 }
 105
 106 // ----------------------------------------------------------------------------
 107 // wxRadioButton event processing
 108 // ----------------------------------------------------------------------------
 109
 110 void wxRadioButton::Command (wxCommandEvent& event)
 111 {
 112     SetValue(event.m_commandInt != 0);
 113     ProcessCommand(event);
 114 }
 115
 116 void wxRadioButton::SetFocus()
 117 {
 118     // when the radio button receives a WM_SETFOCUS message it generates a
 119     // BN_CLICKED which is totally unexpected and leads to catastrophic results
 120     // if you pop up a dialog from the radio button event handler as, when the
 121     // dialog is dismissed, the focus is returned to the radio button which
 122     // generates BN_CLICKED which leads to showing another dialog and so on
 123     // without end!
 124     //
 125     // to aviod this, we drop the pseudo BN_CLICKED events generated when the
 126     // button gains focus
 127     m_focusJustSet = TRUE;
 128
 129     wxControl::SetFocus();
 130 }
 131
 132 bool wxRadioButton::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 133 {
 134     if ( param != BN_CLICKED )
 135         return FALSE;
 136
 137     if ( m_focusJustSet )
 138     {
 139         // see above: we want to ignore this event
 140         m_focusJustSet = FALSE;
 141     }
 142     else // a real clicked event
 143     {
 144         wxCommandEvent event(wxEVT_COMMAND_RADIOBUTTON_SELECTED, GetId());
 145         event.SetEventObject( this );
 146         event.SetInt( GetValue() );
 147
 148         ProcessCommand(event);
 149     }
 150
 151     return TRUE;
 152 }
 153
 154 // ----------------------------------------------------------------------------
 155 // wxRadioButton geometry
 156 // ----------------------------------------------------------------------------
 157
 158 wxSize wxRadioButton::DoGetBestSize() const
 159 {
 160     static int s_radioSize = 0;
 161
 162     if ( !s_radioSize )
 163     {
 164         wxScreenDC dc;
 165         dc.SetFont(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));
 166
 167         s_radioSize = dc.GetCharHeight();
 168     }
 169
 170     wxString str = GetLabel();
 171
 172     int wRadio, hRadio;
 173     if ( !str.empty() )
 174     {
 175         GetTextExtent(str, &wRadio, &hRadio);
 176         wRadio += s_radioSize + GetCharWidth();
 177
 178         if ( hRadio < s_radioSize )
 179             hRadio = s_radioSize;
 180     }
 181     else
 182     {
 183         wRadio = s_radioSize;
 184         hRadio = s_radioSize;
 185     }
 186
 187     return wxSize(wRadio, hRadio);
 188 }
 189
 190 #endif // wxUSE_RADIOBTN