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use termion::event::Key;
use crate::coordinates::{Coordinates};
use crate::widget::Widget;
pub trait Tabbable<T: Widget> {
fn new_tab(&self) -> T;
fn on_next_tab(&mut self);
}
#[derive(PartialEq)]
pub struct TabView<T> where T: Widget, T: Tabbable<T> {
widgets: Vec<T>,
active: usize,
coordinates: Coordinates
}
impl<T> TabView<T> where T: Widget, T: Tabbable<T> {
pub fn new() -> TabView<T> {
TabView {
widgets: vec![],
active: 0,
coordinates: Coordinates::new()
}
}
pub fn push_widget(&mut self, widget: T) {
self.widgets.push(widget);
self.refresh();
}
pub fn pop_widget(&mut self) -> Option<T> {
let widget = self.widgets.pop();
self.refresh();
widget
}
pub fn active_widget(&self) -> &T {
&self.widgets[self.active]
}
pub fn active_widget_mut(&mut self) -> &mut T {
&mut self.widgets[self.active]
}
pub fn new_tab(&mut self) {
let tab = self.active_widget().new_tab();
self.push_widget(tab);
self.active += 1;
}
pub fn close_tab(&mut self) {
if self.active == 0 { return }
if self.active + 1 >= self.widgets.len() { self.active -= 1 }
self.pop_widget();
}
pub fn next_tab(&mut self) {
if self.active + 1 == self.widgets.len() {
self.active = 0;
} else {
self.active += 1
}
self.active_widget_mut().on_next_tab();
}
}
impl<T> Widget for TabView<T> where T: Widget + Tabbable<T> {
fn render_header(&self) -> String {
let xsize = self.get_coordinates().xsize();
let header = self.active_widget().render_header();
let mut nums_length = 0;
let tabnums = (0..self.widgets.len()).map(|num| {
nums_length += format!("{} ", num).len();
if num == self.active {
format!(" {}{}{}{}",
crate::term::invert(),
num,
crate::term::reset(),
crate::term::header_color())
} else {
format!(" {}", num)
}
}).collect::<String>();
let nums_pos = xsize - nums_length as u16;
format!("{}{}{}{}",
header,
crate::term::header_color(),
crate::term::goto_xy(nums_pos, 1),
tabnums)
}
fn render_footer(&self) -> String {
self.active_widget().render_footer()
}
fn refresh(&mut self) {
self.active_widget_mut().refresh();
}
fn get_drawlist(&self) -> String {
self.active_widget().get_drawlist()
}
fn get_coordinates(&self) -> &Coordinates {
&self.coordinates
}
fn set_coordinates(&mut self, coordinates: &Coordinates) {
if self.coordinates == *coordinates {
return;
}
self.coordinates = coordinates.clone();
self.refresh();
}
fn on_key(&mut self, key: Key) {
match key {
Key::Ctrl('t') => self.new_tab(),
Key::Ctrl('w') => self.close_tab(),
Key::Char('\t') => self.next_tab(),
_ => self.active_widget_mut().on_key(key)
}
}
}
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