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use std::borrow::Cow;
use crossterm::event::MouseEvent;
use indextree::NodeId;
use tui::{
backend::Backend,
layout::{Constraint, Layout, Rect},
text::{Span, Spans},
widgets::Paragraph,
Frame,
};
use crate::{
app::{
does_bound_intersect_coordinate,
event::{ComponentEventResult, SelectionAction},
Component, Widget,
},
canvas::Painter,
options::layout_options::LayoutRule,
};
/// A container that "holds" multiple [`BottomWidget`]s through their [`NodeId`]s.
#[derive(PartialEq, Eq)]
pub struct Carousel {
index: usize,
children: Vec<(NodeId, Cow<'static, str>)>,
bounds: Rect,
width: LayoutRule,
height: LayoutRule,
left_button_bounds: Rect,
right_button_bounds: Rect,
}
impl Carousel {
/// Creates a new [`Carousel`] with the specified children.
pub fn new(children: Vec<(NodeId, Cow<'static, str>)>) -> Self {
Self {
index: 0,
children,
bounds: Default::default(),
width: Default::default(),
height: Default::default(),
left_button_bounds: Default::default(),
right_button_bounds: Default::default(),
}
}
/// Sets the width.
pub fn width(mut self, width: LayoutRule) -> Self {
self.width = width;
self
}
/// Sets the height.
pub fn height(mut self, height: LayoutRule) -> Self {
self.height = height;
self
}
/// Adds a new child to a [`Carousel`].
pub fn add_child(&mut self, child: NodeId, name: Cow<'static, str>) {
self.children.push((child, name));
}
/// Returns the currently selected [`NodeId`] if possible.
pub fn get_currently_selected(&self) -> Option<NodeId> {
self.children.get(self.index).map(|i| i.0)
}
fn get_next(&self) -> Option<&(NodeId, Cow<'static, str>)> {
self.children.get(if self.index + 1 == self.children.len() {
0
} else {
self.index + 1
})
}
fn get_prev(&self) -> Option<&(NodeId, Cow<'static, str>)> {
self.children.get(if self.index > 0 {
self.index - 1
} else {
self.children.len().saturating_sub(1)
})
}
fn increment_index(&mut self) {
if self.index + 1 == self.children.len() {
self.index = 0;
} else {
self.index += 1;
}
}
fn decrement_index(&mut self) {
if self.index > 0 {
self.index -= 1;
} else {
self.index = self.children.len().saturating_sub(1);
}
}
/// Draws the [`Carousel`] arrows, and returns back the remaining [`Rect`] to draw the child with.
pub fn draw_carousel<B: Backend>(
&mut self, painter: &Painter, f: &mut Frame<'_, B>, area: Rect,
) -> Rect {
const CONSTRAINTS: [Constraint; 2] = [Constraint::Length(1), Constraint::Min(0)];
let split_area = Layout::default()
.constraints(CONSTRAINTS)
.direction(tui::layout::Direction::Vertical)
.split(area);
self.set_bounds(area);
if let Some((_prev_id, prev_element_name)) = self.get_prev() {
let prev_arrow_text = Spans::from(Span::styled(
format!("◄ {}", prev_element_name),
painter.colours.text_style,
));
self.left_button_bounds = Rect::new(
split_area[0].x,
split_area[0].y,
prev_arrow_text.width() as u16,
split_area[0].height,
);
f.render_widget(
Paragraph::new(vec![prev_arrow_text]).alignment(tui::layout::Alignment::Left),
split_area[0],
);
}
if let Some((_next_id, next_element_name)) = self.get_next() {
let next_arrow_text = Spans::from(Span::styled(
format!("{} ►", next_element_name),
painter.colours.text_style,
));
let width = next_arrow_text.width() as u16;
self.right_button_bounds = Rect::new(
split_area[0].right().saturating_sub(width + 1),
split_area[0].y,
width,
split_area[0].height,
);
f.render_widget(
Paragraph::new(vec![next_arrow_text]).alignment(tui::layout::Alignment::Right),
split_area[0],
);
}
split_area[1]
}
}
impl Component for Carousel {
fn bounds(&self) -> Rect {
self.bounds
}
fn set_bounds(&mut self, new_bounds: Rect) {
self.bounds = new_bounds;
}
fn handle_mouse_event(&mut self, event: MouseEvent) -> ComponentEventResult {
match event.kind {
crossterm::event::MouseEventKind::Down(crossterm::event::MouseButton::Left) => {
let x = event.column;
let y = event.row;
if does_bound_intersect_coordinate(x, y, self.left_button_bounds) {
self.decrement_index();
ComponentEventResult::Redraw
} else if does_bound_intersect_coordinate(x, y, self.right_button_bounds) {
self.increment_index();
ComponentEventResult::Redraw
} else {
ComponentEventResult::Unhandled
}
}
_ => ComponentEventResult::Unhandled,
}
}
}
impl Widget for Carousel {
fn get_pretty_name(&self) -> &'static str {
"Carousel"
}
fn width(&self) -> LayoutRule {
self.width
}
fn height(&self) -> LayoutRule {
self.height
}
fn handle_widget_selection_left(&mut self) -> SelectionAction {
// Override to move to the left widget
self.decrement_index();
SelectionAction::Handled
}
fn handle_widget_selection_right(&mut self) -> SelectionAction {
// Override to move to the right widget
self.increment_index();
SelectionAction::Handled
}
}
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