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馃 Vim-like, Command-line Gemini Client
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1// This file is part of Sydney <https://github.com/gemrest/sydney>.
2//
3// This program is free software: you can redistribute it and/or modify
4// it under the terms of the GNU General Public License as published by
5// the Free Software Foundation, version 3.
6//
7// This program is distributed in the hope that it will be useful, but
8// WITHOUT ANY WARRANTY; without even the implied warranty of
9// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
10// General Public License for more details.
11//
12// You should have received a copy of the GNU General Public License
13// along with this program. If not, see <http://www.gnu.org/licenses/>.
14//
15// Copyright (C) 2022-2022 Fuwn <contact@fuwn.me>
16// SPDX-License-Identifier: GPL-3.0-only
17
18//! <https://github.com/fdehau/tui-rs/blob/master/examples/list.rs>
19
20use ratatui::widgets::ListState;
21
22pub struct StatefulList<T> {
23 pub state: ListState,
24 pub items: Vec<T>,
25 pub selected: usize,
26}
27
28impl<T> StatefulList<T> {
29 pub fn with_items(items: Vec<T>) -> Self {
30 Self {
31 state: ListState::default(),
32 items,
33 selected: 0,
34 }
35 }
36
37 pub fn next(&mut self) {
38 let i = match self.state.selected() {
39 Some(i) =>
40 if i >= self.items.len() - 1 {
41 0
42 } else {
43 i + 1
44 },
45 None => 0,
46 };
47
48 self.selected = i;
49
50 self.state.select(Some(i));
51 }
52
53 pub fn previous(&mut self) {
54 let i = match self.state.selected() {
55 Some(i) =>
56 if i == 0 {
57 self.items.len() - 1
58 } else {
59 i - 1
60 },
61 None => 0,
62 };
63
64 self.selected = i;
65
66 self.state.select(Some(i));
67 }
68
69 pub fn last(&mut self) {
70 self.state.select(Some(self.items.len() - 1));
71
72 self.selected = self.items.len() - 1;
73 }
74
75 pub fn first(&mut self) {
76 self.state.select(Some(0));
77
78 self.selected = 0;
79 }
80
81 pub fn unselect(&mut self) { self.state.select(None); }
82}