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+// * This makes emacs happy -*-Mode: C++;-*-
+/****************************************************************************
+ * Copyright (c) 1998,1999,2000,2001 Free Software Foundation, Inc. *
+ * *
+ * Permission is hereby granted, free of charge, to any person obtaining a *
+ * copy of this software and associated documentation files (the *
+ * "Software"), to deal in the Software without restriction, including *
+ * without limitation the rights to use, copy, modify, merge, publish, *
+ * distribute, distribute with modifications, sublicense, and/or sell *
+ * copies of the Software, and to permit persons to whom the Software is *
+ * furnished to do so, subject to the following conditions: *
+ * *
+ * The above copyright notice and this permission notice shall be included *
+ * in all copies or substantial portions of the Software. *
+ * *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
+ * *
+ * Except as contained in this notice, the name(s) of the above copyright *
+ * holders shall not be used in advertising or otherwise to promote the *
+ * sale, use or other dealings in this Software without prior written *
+ * authorization. *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Author: Juergen Pfeifer, 1997 *
+ * Contact: http://www.familiepfeifer.de/Contact.aspx?Lang=en *
+ ****************************************************************************/
+
+// $Id$
+
+#ifndef NCURSES_CURSESF_H_incl
+#define NCURSES_CURSESF_H_incl 1
+
+#include <cursesp.h>
+#include <string.h>
+
+extern "C" {
+# include <form.h>
+}
+//
+// -------------------------------------------------------------------------
+// The abstract base class for buitin and user defined Fieldtypes.
+// -------------------------------------------------------------------------
+//
+class NCURSES_IMPEXP NCursesFormField; // forward declaration
+
+// Class to represent builtin field types as well as C++ written new
+// fieldtypes (see classes UserDefineFieldType...
+class NCURSES_IMPEXP NCursesFieldType {
+ friend class NCursesFormField;
+
+protected:
+ FIELDTYPE* fieldtype;
+
+ inline void OnError(int err) const THROWS(NCursesFormException) {
+ if (err!=E_OK)
+ THROW(new NCursesFormException (err));
+ }
+
+ NCursesFieldType(FIELDTYPE *f) : fieldtype(f) {
+ }
+
+ virtual ~NCursesFieldType() {}
+
+ // Set the fields f fieldtype to this one.
+ virtual void set(NCursesFormField& f) = 0;
+
+public:
+ NCursesFieldType() : fieldtype((FIELDTYPE*)0) {
+ }
+};
+
+//
+// -------------------------------------------------------------------------
+// The class representing a forms field, wrapping the lowlevel FIELD struct
+// -------------------------------------------------------------------------
+//
+class NCURSES_IMPEXP NCursesFormField {
+ friend class NCursesForm;
+
+protected:
+ FIELD *field; // lowlevel structure
+ NCursesFieldType* ftype; // Associated field type
+
+ // Error handler
+ inline void OnError (int err) const THROWS(NCursesFormException) {
+ if (err != E_OK)
+ THROW(new NCursesFormException (err));
+ }
+
+public:
+ // Create a 'Null' field. Can be used to delimit a field list
+ NCursesFormField()
+ : field((FIELD*)0), ftype((NCursesFieldType*)0) {
+ }
+
+ // Create a new field
+ NCursesFormField (int rows,
+ int cols,
+ int first_row = 0,
+ int first_col = 0,
+ int offscreen_rows = 0,
+ int additional_buffers = 0)
+ : ftype((NCursesFieldType*)0) {
+ field = ::new_field(rows,cols,first_row,first_col,
+ offscreen_rows, additional_buffers);
+ if (!field)
+ OnError(errno);
+ }
+
+ virtual ~NCursesFormField ();
+
+ // Duplicate the field at a new position
+ inline NCursesFormField* dup(int first_row, int first_col) {
+ NCursesFormField* f = new NCursesFormField();
+ if (!f)
+ OnError(E_SYSTEM_ERROR);
+ else {
+ f->ftype = ftype;
+ f->field = ::dup_field(field,first_row,first_col);
+ if (!f->field)
+ OnError(errno);
+ }
+ return f;
+ }
+
+ // Link the field to a new location
+ inline NCursesFormField* link(int first_row, int first_col) {
+ NCursesFormField* f = new NCursesFormField();
+ if (!f)
+ OnError(E_SYSTEM_ERROR);
+ else {
+ f->ftype = ftype;
+ f->field = ::link_field(field,first_row,first_col);
+ if (!f->field)
+ OnError(errno);
+ }
+ return f;
+ }
+
+ // Get the lowlevel field representation
+ inline FIELD* get_field() const {
+ return field;
+ }
+
+ // Retrieve info about the field
+ inline void info(int& rows, int& cols,
+ int& first_row, int& first_col,
+ int& offscreen_rows, int& additional_buffers) const {
+ OnError(::field_info(field, &rows, &cols,
+ &first_row, &first_col,
+ &offscreen_rows, &additional_buffers));
+ }
+
+ // Retrieve info about the fields dynamic properties.
+ inline void dynamic_info(int& dynamic_rows, int& dynamic_cols,
+ int& max_growth) const {
+ OnError(::dynamic_field_info(field, &dynamic_rows, &dynamic_cols,
+ &max_growth));
+ }
+
+ // For a dynamic field you may set the maximum growth limit.
+ // A zero means unlimited growth.
+ inline void set_maximum_growth(int growth = 0) {
+ OnError(::set_max_field(field,growth));
+ }
+
+ // Move the field to a new position
+ inline void move(int row, int col) {
+ OnError(::move_field(field,row,col));
+ }
+
+ // Mark the field to start a new page
+ inline void new_page(bool pageFlag = FALSE) {
+ OnError(::set_new_page(field,pageFlag));
+ }
+
+ // Retrieve whether or not the field starts a new page.
+ inline bool is_new_page() const {
+ return ::new_page(field);
+ }
+
+ // Set the justification for the field
+ inline void set_justification(int just) {
+ OnError(::set_field_just(field,just));
+ }
+
+ // Retrieve the fields justification
+ inline int justification() const {
+ return ::field_just(field);
+ }
+ // Set the foreground attribute for the field
+ inline void set_foreground(chtype fore) {
+ OnError(::set_field_fore(field,fore));
+ }
+
+ // Retrieve the fields foreground attribute
+ inline chtype fore() const {
+ return ::field_fore(field);
+ }
+
+ // Set the background attribute for the field
+ inline void set_background(chtype back) {
+ OnError(::set_field_back(field,back));
+ }
+
+ // Retrieve the fields background attribute
+ inline chtype back() const {
+ return ::field_back(field);
+ }
+
+ // Set the padding character for the field
+ inline void set_pad_character(int pad) {
+ OnError(::set_field_pad(field,pad));
+ }
+
+ // Retrieve the fields padding character
+ inline int pad() const {
+ return ::field_pad(field);
+ }
+
+ // Switch on the fields options
+ inline void options_on (Field_Options options) {
+ OnError (::field_opts_on (field, options));
+ }
+
+ // Switch off the fields options
+ inline void options_off (Field_Options options) {
+ OnError (::field_opts_off (field, options));
+ }
+
+ // Retrieve the fields options
+ inline Field_Options options () const {
+ return ::field_opts (field);
+ }
+
+ // Set the fields options
+ inline void set_options (Field_Options options) {
+ OnError (::set_field_opts (field, options));
+ }
+
+ // Mark the field as changed
+ inline void set_changed(bool changeFlag = TRUE) {
+ OnError(::set_field_status(field,changeFlag));
+ }
+
+ // Test whether or not the field is marked as changed
+ inline bool changed() const {
+ return ::field_status(field);
+ }
+
+ // Return the index of the field in the field array of a form
+ // or -1 if the field is not associated to a form
+ inline int (index)() const {
+ return ::field_index(field);
+ }
+
+ // Store a value in a fields buffer. The default buffer is nr. 0
+ inline void set_value(const char *val, int buffer = 0) {
+ OnError(::set_field_buffer(field,buffer,val));
+ }
+
+ // Retrieve the value of a fields buffer. The default buffer is nr. 0
+ inline char* value(int buffer = 0) const {
+ return ::field_buffer(field,buffer);
+ }
+
+ // Set the validation type of the field.
+ inline void set_fieldtype(NCursesFieldType& f) {
+ ftype = &f;
+ f.set(*this); // A good friend may do that...
+ }
+
+ // Retrieve the validation type of the field.
+ inline NCursesFieldType* fieldtype() const {
+ return ftype;
+ }
+
+};
+
+//
+// -------------------------------------------------------------------------
+// The class representing a form, wrapping the lowlevel FORM struct
+// -------------------------------------------------------------------------
+//
+class NCURSES_IMPEXP NCursesForm : public NCursesPanel {
+protected:
+ FORM* form; // the lowlevel structure
+
+private:
+ NCursesWindow* sub; // the subwindow object
+ bool b_sub_owner; // is this our own subwindow?
+ bool b_framed; // has the form a border?
+ bool b_autoDelete; // Delete fields when deleting form?
+
+ NCursesFormField** my_fields; // The array of fields for this form
+
+ // This structure is used for the form's user data field to link the
+ // FORM* to the C++ object and to provide extra space for a user pointer.
+ typedef struct {
+ void* m_user; // the pointer for the user's data
+ const NCursesForm* m_back; // backward pointer to C++ object
+ const FORM* m_owner;
+ } UserHook;
+
+ // Get the backward pointer to the C++ object from a FORM
+ static inline NCursesForm* getHook(const FORM *f) {
+ UserHook* hook = (UserHook*)::form_userptr(f);
+ assert(hook != 0 && hook->m_owner==f);
+ return (NCursesForm*)(hook->m_back);
+ }
+
+ // This are the built-in hook functions in this C++ binding. In C++ we use
+ // virtual member functions (see below On_..._Init and On_..._Termination)
+ // to provide this functionality in an object oriented manner.
+ static void frm_init(FORM *);
+ static void frm_term(FORM *);
+ static void fld_init(FORM *);
+ static void fld_term(FORM *);
+
+ // Calculate FIELD* array for the menu
+ FIELD** mapFields(NCursesFormField* nfields[]);
+
+protected:
+ // internal routines
+ inline void set_user(void *user) {
+ UserHook* uptr = (UserHook*)::form_userptr (form);
+ assert (uptr != 0 && uptr->m_back==this && uptr->m_owner==form);
+ uptr->m_user = user;
+ }
+
+ inline void *get_user() {
+ UserHook* uptr = (UserHook*)::form_userptr (form);
+ assert (uptr != 0 && uptr->m_back==this && uptr->m_owner==form);
+ return uptr->m_user;
+ }
+
+ void InitForm (NCursesFormField* Fields[],
+ bool with_frame,
+ bool autoDeleteFields);
+
+ inline void OnError (int err) const THROWS(NCursesFormException) {
+ if (err != E_OK)
+ THROW(new NCursesFormException (err));
+ }
+
+ // this wraps the form_driver call.
+ virtual int driver (int c) ;
+
+ // 'Internal' constructor, builds an object without association to a
+ // field array.
+ NCursesForm( int lines,
+ int cols,
+ int begin_y = 0,
+ int begin_x = 0)
+ : NCursesPanel(lines,cols,begin_y,begin_x),
+ form ((FORM*)0) {
+ }
+
+public:
+ // Create form for the default panel.
+ NCursesForm (NCursesFormField* Fields[],
+ bool with_frame=FALSE, // reserve space for a frame?
+ bool autoDelete_Fields=FALSE) // do automatic cleanup?
+ : NCursesPanel() {
+ InitForm(Fields, with_frame, autoDelete_Fields);
+ }
+
+ // Create a form in a panel with the given position and size.
+ NCursesForm (NCursesFormField* Fields[],
+ int lines,
+ int cols,
+ int begin_y,
+ int begin_x,
+ bool with_frame=FALSE, // reserve space for a frame?
+ bool autoDelete_Fields=FALSE) // do automatic cleanup?
+ : NCursesPanel(lines, cols, begin_y, begin_x) {
+ InitForm(Fields, with_frame, autoDelete_Fields);
+ }
+
+ virtual ~NCursesForm();
+
+ // Set the default attributes for the form
+ virtual void setDefaultAttributes();
+
+ // Retrieve current field of the form.
+ inline NCursesFormField* current_field() const {
+ return my_fields[::field_index(::current_field(form))];
+ }
+
+ // Set the forms subwindow
+ void setSubWindow(NCursesWindow& sub);
+
+ // Set these fields for the form
+ inline void setFields(NCursesFormField* Fields[]) {
+ OnError(::set_form_fields(form,mapFields(Fields)));
+ }
+
+ // Remove the form from the screen
+ inline void unpost (void) {
+ OnError (::unpost_form (form));
+ }
+
+ // Post the form to the screen if flag is true, unpost it otherwise
+ inline void post(bool flag = TRUE) {
+ OnError (flag ? ::post_form(form) : ::unpost_form (form));
+ }
+
+ // Decorations
+ inline void frame(const char *title=NULL, const char* btitle=NULL) {
+ if (b_framed)
+ NCursesPanel::frame(title,btitle);
+ else
+ OnError(E_SYSTEM_ERROR);
+ }
+
+ inline void boldframe(const char *title=NULL, const char* btitle=NULL) {
+ if (b_framed)
+ NCursesPanel::boldframe(title,btitle);
+ else
+ OnError(E_SYSTEM_ERROR);
+ }
+
+ inline void label(const char *topLabel, const char *bottomLabel) {
+ if (b_framed)
+ NCursesPanel::label(topLabel,bottomLabel);
+ else
+ OnError(E_SYSTEM_ERROR);
+ }
+
+ // -----
+ // Hooks
+ // -----
+
+ // Called after the form gets repositioned in its window.
+ // This is especially true if the form is posted.
+ virtual void On_Form_Init();
+
+ // Called before the form gets repositioned in its window.
+ // This is especially true if the form is unposted.
+ virtual void On_Form_Termination();
+
+ // Called after the field became the current field
+ virtual void On_Field_Init(NCursesFormField& field);
+
+ // Called before this field is left as current field.
+ virtual void On_Field_Termination(NCursesFormField& field);
+
+ // Calculate required window size for the form.
+ void scale(int& rows, int& cols) const {
+ OnError(::scale_form(form,&rows,&cols));
+ }
+
+ // Retrieve number of fields in the form.
+ int count() const {
+ return ::field_count(form);
+ }
+
+ // Make the page the current page of the form.
+ void set_page(int page) {
+ OnError(::set_form_page(form,page));
+ }
+
+ // Retrieve current page number
+ int page() const {
+ return ::form_page(form);
+ }
+
+ // Switch on the forms options
+ inline void options_on (Form_Options options) {
+ OnError (::form_opts_on (form, options));
+ }
+
+ // Switch off the forms options
+ inline void options_off (Form_Options options) {
+ OnError (::form_opts_off (form, options));
+ }
+
+ // Retrieve the forms options
+ inline Form_Options options () const {
+ return ::form_opts (form);
+ }
+
+ // Set the forms options
+ inline void set_options (Form_Options options) {
+ OnError (::set_form_opts (form, options));
+ }
+
+ // Are there more data in the current field after the data shown
+ inline bool data_ahead() const {
+ return ::data_ahead(form);
+ }
+
+ // Are there more data in the current field before the data shown
+ inline bool data_behind() const {
+ return ::data_behind(form);
+ }
+
+ // Position the cursor to the current field
+ inline void position_cursor () {
+ OnError (::pos_form_cursor (form));
+ }
+ // Set the current field
+ inline void set_current(NCursesFormField& F) {
+ OnError (::set_current_field(form, F.field));
+ }
+
+ // Provide a default key virtualization. Translate the keyboard
+ // code c into a form request code.
+ // The default implementation provides a hopefully straightforward
+ // mapping for the most common keystrokes and form requests.
+ virtual int virtualize(int c);
+
+ // Operators
+ inline NCursesFormField* operator[](int i) const {
+ if ( (i < 0) || (i >= ::field_count (form)) )
+ OnError (E_BAD_ARGUMENT);
+ return my_fields[i];
+ }
+
+ // Perform the menu's operation
+ // Return the field where you left the form.
+ virtual NCursesFormField* operator()(void);
+
+ // Exception handlers. The default is a Beep.
+ virtual void On_Request_Denied(int c) const;
+ virtual void On_Invalid_Field(int c) const;
+ virtual void On_Unknown_Command(int c) const;
+
+};
+
+//
+// -------------------------------------------------------------------------
+// This is the typical C++ typesafe way to allow to attach
+// user data to a field of a form. Its assumed that the user
+// data belongs to some class T. Use T as template argument
+// to create a UserField.
+// -------------------------------------------------------------------------
+template<class T> class NCURSES_IMPEXP NCursesUserField : public NCursesFormField
+{
+public:
+ NCursesUserField (int rows,
+ int cols,
+ int first_row = 0,
+ int first_col = 0,
+ const T* p_UserData = (T*)0,
+ int offscreen_rows = 0,
+ int additional_buffers = 0)
+ : NCursesFormField (rows, cols,
+ first_row, first_col,
+ offscreen_rows, additional_buffers) {
+ if (field)
+ OnError(::set_field_userptr(field,(void *)p_UserData));
+ }
+
+ virtual ~NCursesUserField() {};
+
+ inline const T* UserData (void) const {
+ return (const T*)::field_userptr (field);
+ }
+
+ inline virtual void setUserData(const T* p_UserData) {
+ if (field)
+ OnError (::set_field_userptr (field, (void *)p_UserData));
+ }
+};
+//
+// -------------------------------------------------------------------------
+// The same mechanism is used to attach user data to a form
+// -------------------------------------------------------------------------
+//
+template<class T> class NCURSES_IMPEXP NCursesUserForm : public NCursesForm
+{
+protected:
+ // 'Internal' constructor, builds an object without association to a
+ // field array.
+ NCursesUserForm( int lines,
+ int cols,
+ int begin_y = 0,
+ int begin_x = 0,
+ const T* p_UserData = (T*)0)
+ : NCursesForm(lines,cols,begin_y,begin_x) {
+ if (form)
+ set_user ((void *)p_UserData);
+ }
+
+public:
+ NCursesUserForm (NCursesFormField Fields[],
+ bool with_frame=FALSE,
+ bool autoDelete_Fields=FALSE)
+ : NCursesForm (Fields, with_frame, autoDelete_Fields) {
+ };
+
+ NCursesUserForm (NCursesFormField Fields[],
+ const T* p_UserData = (T*)0,
+ bool with_frame=FALSE,
+ bool autoDelete_Fields=FALSE)
+ : NCursesForm (Fields, with_frame, autoDelete_Fields) {
+ if (form)
+ set_user ((void *)p_UserData);
+ };
+
+ NCursesUserForm (NCursesFormField Fields[],
+ int lines,
+ int cols,
+ int begin_y = 0,
+ int begin_x = 0,
+ const T* p_UserData = (T*)0,
+ bool with_frame=FALSE,
+ bool autoDelete_Fields=FALSE)
+ : NCursesForm (Fields, lines, cols, begin_y, begin_x,
+ with_frame, autoDelete_Fields) {
+ if (form)
+ set_user ((void *)p_UserData);
+ };
+
+ virtual ~NCursesUserForm() {
+ };
+
+ inline T* UserData (void) const {
+ return (T*)get_user ();
+ };
+
+ inline virtual void setUserData (const T* p_UserData) {
+ if (form)
+ set_user ((void *)p_UserData);
+ }
+
+};
+//
+// -------------------------------------------------------------------------
+// Builtin Fieldtypes
+// -------------------------------------------------------------------------
+//
+class NCURSES_IMPEXP Alpha_Field : public NCursesFieldType {
+private:
+ int min_field_width;
+
+ void set(NCursesFormField& f) {
+ OnError(::set_field_type(f.get_field(),fieldtype,min_field_width));
+ }
+
+public:
+ Alpha_Field(int width)
+ : NCursesFieldType(TYPE_ALPHA),
+ min_field_width(width) {
+ }
+};
+
+class NCURSES_IMPEXP Alphanumeric_Field : public NCursesFieldType {
+private:
+ int min_field_width;
+
+ void set(NCursesFormField& f) {
+ OnError(::set_field_type(f.get_field(),fieldtype,min_field_width));
+ }
+
+public:
+ Alphanumeric_Field(int width)
+ : NCursesFieldType(TYPE_ALNUM),
+ min_field_width(width) {
+ }
+};
+
+class NCURSES_IMPEXP Integer_Field : public NCursesFieldType {
+private:
+ int precision;
+ long lower_limit, upper_limit;
+
+ void set(NCursesFormField& f) {
+ OnError(::set_field_type(f.get_field(),fieldtype,
+ precision,lower_limit,upper_limit));
+ }
+
+public:
+ Integer_Field(int prec, long low=0L, long high=0L)
+ : NCursesFieldType(TYPE_INTEGER),
+ precision(prec), lower_limit(low), upper_limit(high) {
+ }
+};
+
+class NCURSES_IMPEXP Numeric_Field : public NCursesFieldType {
+private:
+ int precision;
+ double lower_limit, upper_limit;
+
+ void set(NCursesFormField& f) {
+ OnError(::set_field_type(f.get_field(),fieldtype,
+ precision,lower_limit,upper_limit));
+ }
+
+public:
+ Numeric_Field(int prec, double low=0.0, double high=0.0)
+ : NCursesFieldType(TYPE_NUMERIC),
+ precision(prec), lower_limit(low), upper_limit(high) {
+ }
+};
+
+class NCURSES_IMPEXP Regular_Expression_Field : public NCursesFieldType {
+private:
+ char* regex;
+
+ void set(NCursesFormField& f) {
+ OnError(::set_field_type(f.get_field(),fieldtype,regex));
+ }
+
+public:
+ Regular_Expression_Field(const char *expr)
+ : NCursesFieldType(TYPE_REGEXP) {
+ regex = new char[1 + ::strlen(expr)];
+ (::strcpy)(regex,expr);
+ }
+
+ ~Regular_Expression_Field() {
+ delete[] regex;
+ }
+};
+
+class NCURSES_IMPEXP Enumeration_Field : public NCursesFieldType {
+private:
+ char** list;
+ int case_sensitive;
+ int non_unique_matches;
+
+ void set(NCursesFormField& f) {
+ OnError(::set_field_type(f.get_field(),fieldtype,
+ list,case_sensitive,non_unique_matches));
+ }
+public:
+ Enumeration_Field(char* enums[],
+ bool case_sens=FALSE,
+ bool non_unique=FALSE)
+ : NCursesFieldType(TYPE_ENUM),
+ list(enums),
+ case_sensitive(case_sens?-1:0),
+ non_unique_matches(non_unique?-1:0) {
+ }
+};
+
+class NCURSES_IMPEXP IPV4_Address_Field : public NCursesFieldType {
+private:
+ void set(NCursesFormField& f) {
+ OnError(::set_field_type(f.get_field(),fieldtype));
+ }
+
+public:
+ IPV4_Address_Field() : NCursesFieldType(TYPE_IPV4) {
+ }
+};
+//
+// -------------------------------------------------------------------------
+// Abstract base class for User-Defined Fieldtypes
+// -------------------------------------------------------------------------
+//
+class NCURSES_IMPEXP UserDefinedFieldType : public NCursesFieldType {
+ friend class UDF_Init; // Internal helper to set up statics
+private:
+ // For all C++ defined fieldtypes we need only one generic lowlevel
+ // FIELDTYPE* element.
+ static FIELDTYPE* generic_fieldtype;
+
+protected:
+ // This are the functions required by the low level libforms functions
+ // to construct a fieldtype.
+ static bool fcheck(FIELD *, const void*);
+ static bool ccheck(int c, const void *);
+ static void* makearg(va_list*);
+
+ void set(NCursesFormField& f) {
+ OnError(::set_field_type(f.get_field(),fieldtype,&f));
+ }
+
+protected:
+ // Redefine this function to do a field validation. The argument
+ // is a reference to the field you should validate.
+ virtual bool field_check(NCursesFormField& f) = 0;
+
+ // Redefine this function to do a character validation. The argument
+ // is the character to be validated.
+ virtual bool char_check (int c) = 0;
+
+public:
+ UserDefinedFieldType() : NCursesFieldType(generic_fieldtype) {
+ }
+};
+//
+// -------------------------------------------------------------------------
+// Abstract base class for User-Defined Fieldtypes with Choice functions
+// -------------------------------------------------------------------------
+//
+class NCURSES_IMPEXP UserDefinedFieldType_With_Choice : public UserDefinedFieldType {
+ friend class UDF_Init; // Internal helper to set up statics
+private:
+ // For all C++ defined fieldtypes with choice functions we need only one
+ // generic lowlevel FIELDTYPE* element.
+ static FIELDTYPE* generic_fieldtype_with_choice;
+
+ // This are the functions required by the low level libforms functions
+ // to construct a fieldtype with choice functions.
+ static bool next_choice(FIELD*, const void *);
+ static bool prev_choice(FIELD*, const void *);
+
+protected:
+ // Redefine this function to do the retrieval of the next choice value.
+ // The argument is a reference to the field tobe examined.
+ virtual bool next (NCursesFormField& f) = 0;
+
+ // Redefine this function to do the retrieval of the previous choice value.
+ // The argument is a reference to the field tobe examined.
+ virtual bool previous(NCursesFormField& f) = 0;
+
+public:
+ UserDefinedFieldType_With_Choice() {
+ fieldtype = generic_fieldtype_with_choice;
+ }
+};
+
+#endif // NCURSES_CURSESF_H_incl
+
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