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