356 lines
11 KiB
Rust
356 lines
11 KiB
Rust
//! ## FileList
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//!
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//! `FileList` component renders a file list tab
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/*
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*
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* Copyright (C) 2020-2021 Christian Visintin - christian.visintin1997@gmail.com
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*
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* This file is part of "TermSCP"
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*
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* TermSCP is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* TermSCP is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with TermSCP. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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// locals
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use super::{Component, InputEvent, Msg, Payload, Props, PropsBuilder, Render};
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// ext
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use crossterm::event::KeyCode;
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use tui::{
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layout::Corner,
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style::{Color, Style},
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text::Span,
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widgets::{Block, Borders, List, ListItem},
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};
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// -- states
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/// ## OwnStates
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///
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/// OwnStates contains states for this component
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#[derive(Clone)]
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struct OwnStates {
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list_index: usize, // Index of selected element in list
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list_len: usize, // Length of file list
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}
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impl Default for OwnStates {
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fn default() -> Self {
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OwnStates {
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list_index: 0,
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list_len: 0,
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}
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}
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}
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impl OwnStates {
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/// ### set_list_len
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///
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/// Set list length
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pub fn set_list_len(&mut self, len: usize) {
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self.list_len = len;
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}
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/// ### get_list_index
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///
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/// Return current value for list index
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pub fn get_list_index(&self) -> usize {
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self.list_index
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}
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/// ### incr_list_index
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///
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/// Incremenet list index
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pub fn incr_list_index(&mut self) {
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// Check if index is at last element
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if self.list_index + 1 < self.list_len {
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self.list_index += 1;
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}
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}
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/// ### decr_list_index
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///
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/// Decrement list index
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pub fn decr_list_index(&mut self) {
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// Check if index is bigger than 0
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if self.list_index > 0 {
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self.list_index -= 1;
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}
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}
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/// ### reset_list_index
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///
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/// Reset list index to 0
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pub fn reset_list_index(&mut self) {
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self.list_index = 0;
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}
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}
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// -- Component
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/// ## FileList
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///
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/// File list component
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pub struct FileList {
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props: Props,
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states: OwnStates,
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}
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impl FileList {
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/// ### new
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///
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/// Instantiates a new FileList starting from Props
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/// The method also initializes the component states.
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pub fn new(props: Props) -> Self {
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// Initialize states
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let mut states: OwnStates = OwnStates::default();
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// Set list length
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states.set_list_len(match &props.texts.body {
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Some(tokens) => tokens.len(),
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None => 0,
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});
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FileList { props, states }
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}
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}
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impl Component for FileList {
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/// ### render
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///
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/// Based on the current properties and states, return a Widget instance for the Component
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/// Returns None if the component is hidden
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fn render(&self) -> Option<Render> {
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match self.props.visible {
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false => None,
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true => {
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// Make list
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let list_item: Vec<ListItem> = match self.props.texts.body.as_ref() {
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None => vec![],
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Some(lines) => lines
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.iter()
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.map(|line: &String| ListItem::new(Span::from(line.to_string())))
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.collect(),
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};
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let (fg, bg): (Color, Color) = match self.props.focus {
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true => (Color::Reset, self.props.background),
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false => (self.props.foreground, Color::Reset),
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};
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let title: String = match self.props.texts.title.as_ref() {
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Some(t) => t.clone(),
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None => String::new(),
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};
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// Render
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Some(Render {
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widget: Box::new(
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List::new(list_item)
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.block(
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Block::default()
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.borders(Borders::ALL)
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.border_style(match self.props.focus {
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true => Style::default().fg(self.props.foreground),
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false => Style::default(),
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})
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.title(title),
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)
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.start_corner(Corner::TopLeft)
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.highlight_style(
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Style::default()
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.bg(bg)
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.fg(fg)
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.add_modifier(self.props.get_modifiers()),
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),
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),
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cursor: self.states.list_index,
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})
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}
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}
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}
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/// ### update
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///
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/// Update component properties
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/// Properties should first be retrieved through `get_props` which creates a builder from
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/// existing properties and then edited before calling update
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fn update(&mut self, props: Props) -> Msg {
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self.props = props;
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// re-Set list length
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self.states.set_list_len(match &self.props.texts.body {
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Some(tokens) => tokens.len(),
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None => 0,
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});
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// Reset list index
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self.states.reset_list_index();
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Msg::None
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}
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/// ### get_props
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///
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/// Returns a props builder starting from component properties.
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/// This returns a prop builder in order to make easier to create
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/// new properties for the element.
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fn get_props(&self) -> PropsBuilder {
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PropsBuilder::from_props(&self.props)
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}
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/// ### on
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///
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/// Handle input event and update internal states
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fn on(&mut self, ev: InputEvent) -> Msg {
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// Match event
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if let InputEvent::Key(key) = ev {
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match key.code {
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KeyCode::Down => {
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// Update states
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self.states.incr_list_index();
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Msg::None
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}
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KeyCode::Up => {
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// Update states
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self.states.decr_list_index();
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Msg::None
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}
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KeyCode::PageDown => {
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// Update states
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for _ in 0..8 {
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self.states.incr_list_index();
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}
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Msg::None
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}
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KeyCode::PageUp => {
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// Update states
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for _ in 0..8 {
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self.states.decr_list_index();
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}
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Msg::None
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}
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KeyCode::Enter => {
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// Report event
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Msg::OnSubmit(self.get_value())
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}
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_ => {
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// Return key event to activity
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Msg::OnKey(key)
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}
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}
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} else {
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// Unhandled event
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Msg::None
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}
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}
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/// ### get_value
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///
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/// Return component value. File list return index
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fn get_value(&self) -> Payload {
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Payload::Unumber(self.states.get_list_index())
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}
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// -- events
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/// ### should_umount
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///
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/// The component must provide to the supervisor whether it should be umounted (destroyed)
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/// This makes sense to be called after an `on` or after an `update`, where the states changes.
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fn should_umount(&self) -> bool {
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// Never true
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false
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::ui::layout::props::TextParts;
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use crossterm::event::KeyEvent;
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#[test]
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fn test_ui_layout_components_file_list() {
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// Make component
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let mut component: FileList = FileList::new(
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PropsBuilder::default()
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.with_texts(TextParts::new(
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Some(String::from("filelist")),
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Some(vec![String::from("file1"), String::from("file2")]),
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))
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.build(),
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);
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// Verify states
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assert_eq!(component.states.list_index, 0);
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assert_eq!(component.states.list_len, 2);
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// Increment list index
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component.states.list_index += 1;
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assert_eq!(component.render().unwrap().cursor, 1);
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// Should umount
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assert_eq!(component.should_umount(), false);
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// Update
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component.update(
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component
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.get_props()
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.with_texts(TextParts::new(
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Some(String::from("filelist")),
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Some(vec![
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String::from("file1"),
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String::from("file2"),
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String::from("file3"),
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]),
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))
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.build(),
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);
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// Verify states
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assert_eq!(component.states.list_index, 0);
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assert_eq!(component.states.list_len, 3);
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// Render
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assert_eq!(component.render().unwrap().cursor, 0);
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// Handle inputs
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assert_eq!(
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component.on(InputEvent::Key(KeyEvent::from(KeyCode::Down))),
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Msg::None
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);
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// Index should be incremented
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assert_eq!(component.states.list_index, 1);
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// Index should be decremented
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assert_eq!(
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component.on(InputEvent::Key(KeyEvent::from(KeyCode::Up))),
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Msg::None
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);
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// Index should be incremented
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assert_eq!(component.states.list_index, 0);
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// Index should be 2
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assert_eq!(
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component.on(InputEvent::Key(KeyEvent::from(KeyCode::PageDown))),
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Msg::None
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);
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// Index should be incremented
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assert_eq!(component.states.list_index, 2);
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// Index should be 0
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assert_eq!(
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component.on(InputEvent::Key(KeyEvent::from(KeyCode::PageUp))),
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Msg::None
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);
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// Index should be incremented
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assert_eq!(component.states.list_index, 0);
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// Enter
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assert_eq!(
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component.on(InputEvent::Key(KeyEvent::from(KeyCode::Enter))),
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Msg::OnSubmit(Payload::Unumber(0))
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);
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// On key
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assert_eq!(
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component.on(InputEvent::Key(KeyEvent::from(KeyCode::Backspace))),
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Msg::OnKey(KeyEvent::from(KeyCode::Backspace))
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);
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}
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}
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