src/list.rs


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#[derive(Debug)]
pub struct ContentList<T> {
    pub list: Vec<T>,
    pub index: usize,
}

impl<T> ContentList<T> {
    pub fn new() -> Self {
        ContentList {
            list: Vec::new(),
            index: 0,
        }
    }

    // Go to next item in list
    pub fn next(&mut self) {
        let len = self.list.len();
        if len != 0 {
            if self.index < len - 1 {
                self.index += 1;
            }
        }

        // let len = self.list.len();
        // if len != 0 {
        //     if self.index == self.list.len() - 1 {
        //         self.index = 0;
        //     } else {
        //         self.index += 1;
        //     }
        // }
    }

    /// Go to previous item in list
    pub fn prev(&mut self) {
        if self.index != 0 {
            self.index -= 1;
        }
        // if self.index == 0 {
        //     let len = self.list.len();
        //     if len != 0 {
        //         self.index = len - 1;
        //     }
        // } else {
        //     self.index -= 1;
        // }
    }

    pub fn reset_index(&mut self) {
        self.index = 0;
    }
}