ref: a0056875827f1e6efb74834cc8ac051ecc2d765c
dir: /textscreen/txt_conditional.h/
//
// Copyright(C) 2016 Simon Howard
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
#ifndef TXT_CONDITIONAL_H
#define TXT_CONDITIONAL_H
/**
* @file txt_conditional.h
*
* Conditional widget.
*/
/**
* Conditional widget.
*
* A conditional widget contains another widget, and conditionally
* shows or hides it based on the value of a variable.
*/
typedef struct txt_conditional_s txt_conditional_t;
#include "txt_widget.h"
/**
* Create a new conditional widget.
*
* @param var The variable to check.
* @param expected_value If the variable has this value, the widget is shown.
* @param child The inner widget to show or hide.
* @return Pointer to the new conditional widget.
*/
txt_conditional_t *TXT_NewConditional(int *var, int expected_value,
TXT_UNCAST_ARG(child));
/**
* Return the given child widget if the given boolean condition is true.
*
* If the condition is not true, the child widget is destroyed and a dummy
* "null" widget is returned that shows nothing.
*
* @param condition Boolean condition - true or false value.
* @param child Widget to conditionally return.
* @return Either child (if condition is true) or a null
* widget.
*/
txt_widget_t *TXT_If(int condition, TXT_UNCAST_ARG(child));
#endif /* #ifndef TXT_CONDITIONAL_H */