implement support for custom button labels in wxMessageBox under MSW; refactor the code to reuse the existing setters in Mac ports for MSW as well

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@55475 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msgdlg.h

@@ -107,8 +107,101 @@ protected:
              m_extendedMessage,
              m_caption;
     long m_dialogStyle;
+
+    DECLARE_NO_COPY_CLASS(wxMessageDialogBase)
 };
 
+// this is a helper class for native wxMessageDialog implementations which need
+// to store the custom button labels as member variables and then use them in
+// ShowModal() (there could conceivably be a port which would have some native
+// functions for setting these labels immediately and we also don't need to
+// store them at all if custom labels are not supported, which is why we do
+// this in a separate class and not wxMessageDialogBase itself)
+#if defined(__WXCOCOA__) || defined(__WXMAC__) || defined(__WXMSW__)
+
+class WXDLLIMPEXP_CORE wxMessageDialogWithCustomLabels
+    : public wxMessageDialogBase
+{
+public:
+    // ctors
+    wxMessageDialogWithCustomLabels() { }
+    wxMessageDialogWithCustomLabels(wxWindow *parent,
+                                    const wxString& message,
+                                    const wxString& caption,
+                                    long style)
+        : wxMessageDialogBase(parent, message, caption, style)
+    {
+    }
+
+    // customization of the message box buttons
+    virtual bool SetYesNoLabels(const wxString& yes,const wxString& no)
+    {
+        DoSetCustomLabel(m_yes, yes);
+        DoSetCustomLabel(m_no, no);
+        return true;
+    }
+
+    virtual bool SetYesNoCancelLabels(const wxString& yes,
+                                      const wxString& no,
+                                      const wxString& cancel)
+    {
+        DoSetCustomLabel(m_yes, yes);
+        DoSetCustomLabel(m_no, no);
+        DoSetCustomLabel(m_cancel, cancel);
+        return true;
+    }
+
+    virtual bool SetOKLabel(const wxString& ok)
+    {
+        DoSetCustomLabel(m_ok, ok);
+        return true;
+    }
+
+    virtual bool SetOKCancelLabels(const wxString& ok, const wxString& cancel)
+    {
+        DoSetCustomLabel(m_ok, ok);
+        DoSetCustomLabel(m_cancel, cancel);
+        return true;
+    }
+
+protected:
+    // test if any custom labels were set
+    bool HasCustomLabels() const
+    {
+        return !(m_ok.empty() && m_cancel.empty() &&
+                 m_yes.empty() && m_no.empty());
+    }
+
+    // these functions return the label to be used for the button which is
+    // either a custom label explicitly set by the user or the default label,
+    // i.e. they always return a valid string
+    wxString GetYesLabel() const { return m_yes.empty() ? _("Yes") : m_yes; }
+    wxString GetNoLabel() const { return m_no.empty() ? _("No") : m_no; }
+    wxString GetOKLabel() const { return m_ok.empty() ? _("OK") : m_ok; }
+    wxString GetCancelLabel() const
+        { return m_cancel.empty() ? _("Cancel") : m_cancel; }
+
+private:
+    // this function is called by our public SetXXXLabels() and should assign
+    // the value to var with possibly some transformation (e.g. Cocoa version
+    // currently uses this to remove any accelerators from the button strings)
+    virtual void DoSetCustomLabel(wxString& var, const wxString& value)
+    {
+        var = value;
+    }
+
+    // labels for the buttons, initially empty meaning that the defaults should
+    // be used, use GetYes/No/OK/CancelLabel() to access them
+    wxString m_yes,
+             m_no,
+             m_ok,
+             m_cancel;
+
+    DECLARE_NO_COPY_CLASS(wxMessageDialogWithCustomLabels)
+};
+
+#endif // ports needing wxMessageDialogWithCustomLabels
+
 #if defined(__WX_COMPILING_MSGDLGG_CPP__) || \
     defined(__WXUNIVERSAL__) || defined(__WXGPE__) || \
     (defined(__WXGTK__) && !defined(__WXGTK20__))