X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/997176a34641a870b1f6c6102e30f64f86b4122a..173a5ddc77ceb29b7a0dba6d9feeea95ebbbd72b:/include/wx/checkbox.h

diff --git a/include/wx/checkbox.h b/include/wx/checkbox.h
index 8ccb6539e3..3ecfb6169f 100644
--- a/include/wx/checkbox.h
+++ b/include/wx/checkbox.h
@@ -5,7 +5,7 @@
 // Modified by:
 // Created:     07.09.00
 // RCS-ID:      $Id$
-// Copyright:   (c) wxWindows team
+// Copyright:   (c) wxWidgets team
 // Licence:     wxWindows licence
 ///////////////////////////////////////////////////////////////////////////////
 
@@ -18,39 +18,176 @@
 
 #include "wx/control.h"
 
-WXDLLEXPORT_DATA(extern const wxChar*) wxCheckBoxNameStr;
+
+/*
+ * wxCheckBox style flags
+ * (Using wxCHK_* because wxCB_* is used by wxComboBox).
+ * Determine whether to use a 3-state or 2-state
+ * checkbox. 3-state enables to differentiate
+ * between 'unchecked', 'checked' and 'undetermined'.
+ *
+ * In addition to the styles here it is also possible to specify just 0 which
+ * is treated the same as wxCHK_2STATE for compatibility (but using explicit
+ * flag is preferred).
+ */
+#define wxCHK_2STATE           0x4000
+#define wxCHK_3STATE           0x1000
+
+/*
+ * If this style is set the user can set the checkbox to the
+ * undetermined state. If not set the undetermined set can only
+ * be set programmatically.
+ * This style can only be used with 3 state checkboxes.
+ */
+#define wxCHK_ALLOW_3RD_STATE_FOR_USER 0x2000
+
+extern WXDLLIMPEXP_DATA_CORE(const char) wxCheckBoxNameStr[];
 
 // ----------------------------------------------------------------------------
 // wxCheckBox: a control which shows a label and a box which may be checked
 // ----------------------------------------------------------------------------
 
-class WXDLLEXPORT wxCheckBoxBase : public wxControl
+class WXDLLIMPEXP_CORE wxCheckBoxBase : public wxControl
 {
 public:
+    wxCheckBoxBase() { }
+
     // set/get the checked status of the listbox
     virtual void SetValue(bool value) = 0;
     virtual bool GetValue() const = 0;
 
-    bool IsChecked() const { return GetValue(); }
+    bool IsChecked() const
+    {
+        wxASSERT_MSG( !Is3State(), wxT("Calling IsChecked() doesn't make sense for")
+            wxT(" a three state checkbox, Use Get3StateValue() instead") );
+
+        return GetValue();
+    }
+
+    wxCheckBoxState Get3StateValue() const
+    {
+        wxCheckBoxState state = DoGet3StateValue();
+
+        if ( state == wxCHK_UNDETERMINED && !Is3State() )
+        {
+            // Undetermined state with a 2-state checkbox??
+            wxFAIL_MSG( wxT("DoGet3StateValue() says the 2-state checkbox is ")
+                wxT("in an undetermined/third state") );
+
+            state = wxCHK_UNCHECKED;
+        }
+
+        return state;
+    }
+
+    void Set3StateValue(wxCheckBoxState state)
+    {
+        if ( state == wxCHK_UNDETERMINED && !Is3State() )
+        {
+            wxFAIL_MSG(wxT("Setting a 2-state checkbox to undetermined state"));
+            state = wxCHK_UNCHECKED;
+        }
+
+        DoSet3StateValue(state);
+    }
+
+    bool Is3State() const { return HasFlag(wxCHK_3STATE); }
+
+    bool Is3rdStateAllowedForUser() const
+    {
+        return HasFlag(wxCHK_ALLOW_3RD_STATE_FOR_USER);
+    }
+
+    virtual bool HasTransparentBackground() { return true; }
+
+    // wxCheckBox-specific processing after processing the update event
+    virtual void DoUpdateWindowUI(wxUpdateUIEvent& event)
+    {
+        wxControl::DoUpdateWindowUI(event);
+
+        if ( event.GetSetChecked() )
+            SetValue(event.GetChecked());
+    }
+
+protected:
+    // choose the default border for this window
+    virtual wxBorder GetDefaultBorder() const { return wxBORDER_NONE; }
+
+    virtual void DoSet3StateValue(wxCheckBoxState WXUNUSED(state)) { wxFAIL; }
+
+    virtual wxCheckBoxState DoGet3StateValue() const
+    {
+        wxFAIL;
+        return wxCHK_UNCHECKED;
+    }
+
+    // Helper function to be called from derived classes Create()
+    // implementations: it checks that the style doesn't contain any
+    // incompatible bits and modifies it to be sane if it does.
+    static void WXValidateStyle(long *stylePtr)
+    {
+        long& style = *stylePtr;
+
+        if ( !(style & (wxCHK_2STATE | wxCHK_3STATE)) )
+        {
+            // For compatibility we use absence of style flags as wxCHK_2STATE
+            // because wxCHK_2STATE used to have the value of 0 and some
+            // existing code uses 0 instead of it. Moreover, some code even
+            // uses some non-0 style, e.g. wxBORDER_XXX, but doesn't specify
+            // neither wxCHK_2STATE nor wxCHK_3STATE -- to avoid breaking it,
+            // assume (much more common) 2 state checkbox by default.
+            style |= wxCHK_2STATE;
+        }
+
+        if ( style & wxCHK_3STATE )
+        {
+            if ( style & wxCHK_2STATE )
+            {
+                wxFAIL_MSG( "wxCHK_2STATE and wxCHK_3STATE can't be used "
+                            "together" );
+                style &= ~wxCHK_3STATE;
+            }
+        }
+        else // No wxCHK_3STATE
+        {
+            if ( style & wxCHK_ALLOW_3RD_STATE_FOR_USER )
+            {
+                wxFAIL_MSG( "wxCHK_ALLOW_3RD_STATE_FOR_USER doesn't make sense "
+                            "without wxCHK_3STATE" );
+                style &= ~wxCHK_ALLOW_3RD_STATE_FOR_USER;
+            }
+        }
+    }
+
+private:
+    wxDECLARE_NO_COPY_CLASS(wxCheckBoxBase);
 };
 
+// Most ports support 3 state checkboxes so define this by default.
+#define wxHAS_3STATE_CHECKBOX
+
 #if defined(__WXUNIVERSAL__)
     #include "wx/univ/checkbox.h"
 #elif defined(__WXMSW__)
     #include "wx/msw/checkbox.h"
 #elif defined(__WXMOTIF__)
     #include "wx/motif/checkbox.h"
-#elif defined(__WXGTK__)
+#elif defined(__WXGTK20__)
     #include "wx/gtk/checkbox.h"
+#elif defined(__WXGTK__)
+    #undef wxHAS_3STATE_CHECKBOX
+    #include "wx/gtk1/checkbox.h"
 #elif defined(__WXMAC__)
-    #include "wx/mac/checkbox.h"
+    #include "wx/osx/checkbox.h"
 #elif defined(__WXCOCOA__)
     #include "wx/cocoa/checkbox.h"
 #elif defined(__WXPM__)
+    #undef wxHAS_3STATE_CHECKBOX
     #include "wx/os2/checkbox.h"
+#elif defined(__WXPALMOS__)
+    #include "wx/palmos/checkbox.h"
 #endif
 
 #endif // wxUSE_CHECKBOX
 
-#endif
-    // _WX_CHECKBOX_H_BASE_
+#endif // _WX_CHECKBOX_H_BASE_