include/wx/checkbox.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/checkbox.h
   3 // Purpose:     wxCheckBox class interface
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     07.09.00
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) wxWidgets team
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_CHECKBOX_H_BASE_
  13 #define _WX_CHECKBOX_H_BASE_
  14
  15 #include "wx/defs.h"
  16
  17 #if wxUSE_CHECKBOX
  18
  19 #include "wx/control.h"
  20
  21
  22 /*
  23  * wxCheckBox style flags
  24  * (Using wxCHK_* because wxCB_* is used by wxComboBox).
  25  * Determine whether to use a 3-state or 2-state
  26  * checkbox. 3-state enables to differentiate
  27  * between 'unchecked', 'checked' and 'undetermined'.
  28  *
  29  * In addition to the styles here it is also possible to specify just 0 which
  30  * is treated the same as wxCHK_2STATE for compatibility (but using explicit
  31  * flag is preferred).
  32  */
  33 #define wxCHK_2STATE           0x4000
  34 #define wxCHK_3STATE           0x1000
  35
  36 /*
  37  * If this style is set the user can set the checkbox to the
  38  * undetermined state. If not set the undetermined set can only
  39  * be set programmatically.
  40  * This style can only be used with 3 state checkboxes.
  41  */
  42 #define wxCHK_ALLOW_3RD_STATE_FOR_USER 0x2000
  43
  44 extern WXDLLIMPEXP_DATA_CORE(const char) wxCheckBoxNameStr[];
  45
  46 // ----------------------------------------------------------------------------
  47 // wxCheckBox: a control which shows a label and a box which may be checked
  48 // ----------------------------------------------------------------------------
  49
  50 class WXDLLIMPEXP_CORE wxCheckBoxBase : public wxControl
  51 {
  52 public:
  53     wxCheckBoxBase() { }
  54
  55     // set/get the checked status of the listbox
  56     virtual void SetValue(bool value) = 0;
  57     virtual bool GetValue() const = 0;
  58
  59     bool IsChecked() const
  60     {
  61         wxASSERT_MSG( !Is3State(), wxT("Calling IsChecked() doesn't make sense for")
  62             wxT(" a three state checkbox, Use Get3StateValue() instead") );
  63
  64         return GetValue();
  65     }
  66
  67     wxCheckBoxState Get3StateValue() const
  68     {
  69         wxCheckBoxState state = DoGet3StateValue();
  70
  71         if ( state == wxCHK_UNDETERMINED && !Is3State() )
  72         {
  73             // Undetermined state with a 2-state checkbox??
  74             wxFAIL_MSG( wxT("DoGet3StateValue() says the 2-state checkbox is ")
  75                 wxT("in an undetermined/third state") );
  76
  77             state = wxCHK_UNCHECKED;
  78         }
  79
  80         return state;
  81     }
  82
  83     void Set3StateValue(wxCheckBoxState state)
  84     {
  85         if ( state == wxCHK_UNDETERMINED && !Is3State() )
  86         {
  87             wxFAIL_MSG(wxT("Setting a 2-state checkbox to undetermined state"));
  88             state = wxCHK_UNCHECKED;
  89         }
  90
  91         DoSet3StateValue(state);
  92     }
  93
  94     bool Is3State() const { return HasFlag(wxCHK_3STATE); }
  95
  96     bool Is3rdStateAllowedForUser() const
  97     {
  98         return HasFlag(wxCHK_ALLOW_3RD_STATE_FOR_USER);
  99     }
 100
 101     virtual bool HasTransparentBackground() { return true; }
 102
 103     // wxCheckBox-specific processing after processing the update event
 104     virtual void DoUpdateWindowUI(wxUpdateUIEvent& event)
 105     {
 106         wxControl::DoUpdateWindowUI(event);
 107
 108         if ( event.GetSetChecked() )
 109             SetValue(event.GetChecked());
 110     }
 111
 112 protected:
 113     // choose the default border for this window
 114     virtual wxBorder GetDefaultBorder() const { return wxBORDER_NONE; }
 115
 116     virtual void DoSet3StateValue(wxCheckBoxState WXUNUSED(state)) { wxFAIL; }
 117
 118     virtual wxCheckBoxState DoGet3StateValue() const
 119     {
 120         wxFAIL;
 121         return wxCHK_UNCHECKED;
 122     }
 123
 124     // Helper function to be called from derived classes Create()
 125     // implementations: it checks that the style doesn't contain any
 126     // incompatible bits and modifies it to be sane if it does.
 127     static void WXValidateStyle(long *stylePtr)
 128     {
 129         long& style = *stylePtr;
 130
 131         if ( !(style & (wxCHK_2STATE | wxCHK_3STATE)) )
 132         {
 133             // For compatibility we use absence of style flags as wxCHK_2STATE
 134             // because wxCHK_2STATE used to have the value of 0 and some
 135             // existing code uses 0 instead of it. Moreover, some code even
 136             // uses some non-0 style, e.g. wxBORDER_XXX, but doesn't specify
 137             // neither wxCHK_2STATE nor wxCHK_3STATE -- to avoid breaking it,
 138             // assume (much more common) 2 state checkbox by default.
 139             style |= wxCHK_2STATE;
 140         }
 141
 142         if ( style & wxCHK_3STATE )
 143         {
 144             if ( style & wxCHK_2STATE )
 145             {
 146                 wxFAIL_MSG( "wxCHK_2STATE and wxCHK_3STATE can't be used "
 147                             "together" );
 148                 style &= ~wxCHK_3STATE;
 149             }
 150         }
 151         else // No wxCHK_3STATE
 152         {
 153             if ( style & wxCHK_ALLOW_3RD_STATE_FOR_USER )
 154             {
 155                 wxFAIL_MSG( "wxCHK_ALLOW_3RD_STATE_FOR_USER doesn't make sense "
 156                             "without wxCHK_3STATE" );
 157                 style &= ~wxCHK_ALLOW_3RD_STATE_FOR_USER;
 158             }
 159         }
 160     }
 161
 162 private:
 163     wxDECLARE_NO_COPY_CLASS(wxCheckBoxBase);
 164 };
 165
 166 // Most ports support 3 state checkboxes so define this by default.
 167 #define wxHAS_3STATE_CHECKBOX
 168
 169 #if defined(__WXUNIVERSAL__)
 170     #include "wx/univ/checkbox.h"
 171 #elif defined(__WXMSW__)
 172     #include "wx/msw/checkbox.h"
 173 #elif defined(__WXMOTIF__)
 174     #include "wx/motif/checkbox.h"
 175 #elif defined(__WXGTK20__)
 176     #include "wx/gtk/checkbox.h"
 177 #elif defined(__WXGTK__)
 178     #undef wxHAS_3STATE_CHECKBOX
 179     #include "wx/gtk1/checkbox.h"
 180 #elif defined(__WXMAC__)
 181     #include "wx/osx/checkbox.h"
 182 #elif defined(__WXCOCOA__)
 183     #include "wx/cocoa/checkbox.h"
 184 #elif defined(__WXPM__)
 185     #undef wxHAS_3STATE_CHECKBOX
 186     #include "wx/os2/checkbox.h"
 187 #endif
 188
 189 #endif // wxUSE_CHECKBOX
 190
 191 #endif // _WX_CHECKBOX_H_BASE_