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//
// Formula Int Input widget header file for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2025 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
// https://www.fltk.org/bugs.php
//
#ifndef FLUID_WIDGETS_FORMULA_INPUT_H
#define FLUID_WIDGETS_FORMULA_INPUT_H
#include <FL/Fl_Input.H>
namespace fld {
namespace widget {
class Formula_Input;
// Callback signature for function returning the value of a variable.
typedef int (Fluid_Coord_Callback)(Formula_Input const *, void*);
// Entry for a list of variables available to an input field.
// Formula_Input::variables() expects an array of
// Formula_Input_Vars with the last entry's name_ set to nullptr.
typedef struct Formula_Input_Vars {
const char *name_;
Fluid_Coord_Callback *callback_;
} Formula_Input_Vars;
// A text input widget that understands simple math.
class Formula_Input : public Fl_Input
{
Fl_Callback *user_callback_ { nullptr };
Formula_Input_Vars *vars_ { nullptr };
void *vars_user_data_ { nullptr };
static void callback_handler_cb(Formula_Input *This, void *v);
void callback_handler(void *v);
int eval_var(uchar *&s) const;
int eval(uchar *&s, int prio) const;
int eval(const char *s) const;
public:
Formula_Input(int x, int y, int w, int h, const char *l = nullptr);
/** Return the text in the widget text field. */
const char *text() const { return Fl_Input::value(); }
/** Set the text in the text field */
void text(const char *v) { Fl_Input::value(v); }
int value() const;
void value(int v);
/** Set the general callback for this widget. */
void callback(Fl_Callback *cb) { user_callback_ = cb; }
void variables(fld::widget::Formula_Input_Vars *vars, void *user_data);
int handle(int) override;
};
} // namespace widget
} // namespace fld
#endif // FLUID_WIDGETS_FORMULA_INPUT_H
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