ref: 5b3b1bbab6c49148b9309d0a9de0ef33e1a63513
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 */