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