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use std::sync::mpsc::Receiver;
use tui::{backend::Backend, Terminal};
use crate::tuine::Status;
use super::{
build_layout_tree, Application, DrawContext, Element, Event, LayoutNode, StateContext,
StateMap, TmpComponent, ViewContext,
};
#[derive(Clone, Copy, Debug)]
pub enum RuntimeEvent<Message> {
UserInterface(Event),
Resize { width: u16, height: u16 },
Custom(Message),
}
#[derive(Default)]
struct AppData {
state_map: StateMap,
}
pub(crate) fn launch<A, B>(
mut application: A, receiver: Receiver<RuntimeEvent<A::Message>>, terminal: &mut Terminal<B>,
) -> anyhow::Result<()>
where
A: Application + 'static,
B: Backend,
{
let mut app_data = AppData::default(); // FIXME: This needs to be cleared periodically!
let mut layout: LayoutNode = LayoutNode::default();
let mut user_interface = {
let mut ui = create_user_interface(&mut application, &mut app_data);
draw(&mut ui, terminal, &mut app_data, &mut layout)?;
ui
};
while !application.is_terminated() {
if let Ok(event) = receiver.recv() {
match event {
RuntimeEvent::UserInterface(event) => {
if on_event(
&mut application,
&mut user_interface,
&mut app_data,
&mut layout,
event,
) {
if application.is_terminated() {
break;
}
user_interface = create_user_interface(&mut application, &mut app_data);
draw(&mut user_interface, terminal, &mut app_data, &mut layout)?;
}
}
RuntimeEvent::Custom(message) => {
if application.update(message) {
user_interface = create_user_interface(&mut application, &mut app_data);
draw(&mut user_interface, terminal, &mut app_data, &mut layout)?;
}
}
RuntimeEvent::Resize {
width: _,
height: _,
} => {
user_interface = create_user_interface(&mut application, &mut app_data);
// FIXME: Also nuke any cache and the like...
draw(&mut user_interface, terminal, &mut app_data, &mut layout)?;
}
}
} else {
break;
}
}
application.destructor();
Ok(())
}
/// Handles a [`Event`].
fn on_event<A>(
application: &mut A, user_interface: &mut Element<A::Message>, app_data: &mut AppData,
layout: &mut LayoutNode, event: Event,
) -> bool
where
A: Application + 'static,
{
let mut messages = vec![];
let mut state_ctx = StateContext::new(&mut app_data.state_map);
let draw_ctx = DrawContext::root(&layout);
let event_handled =
match user_interface.on_event(&mut state_ctx, &draw_ctx, event, &mut messages) {
Status::Captured => Status::Captured,
Status::Ignored => application.global_event_handler(event, &mut messages),
};
let mut should_redraw = match event_handled {
Status::Captured => true,
Status::Ignored => false,
};
for msg in messages {
// debug!("Message: {:?}", msg);
let msg_result = application.update(msg);
should_redraw = should_redraw || msg_result;
}
should_redraw
}
/// Creates a new [`Element`] representing the root of the user interface.
fn create_user_interface<A>(application: &mut A, app_data: &mut AppData) -> Element<A::Message>
where
A: Application + 'static,
{
let mut ctx = ViewContext::new(&mut app_data.state_map);
application.view(&mut ctx)
}
/// Updates the layout, and draws the given user interface.
fn draw<M, B>(
user_interface: &mut Element<M>, terminal: &mut Terminal<B>, app_data: &mut AppData,
layout: &mut LayoutNode,
) -> anyhow::Result<()>
where
B: Backend,
{
terminal.draw(|frame| {
let rect = frame.size();
*layout = build_layout_tree(rect, &user_interface);
let mut state_ctx = StateContext::new(&mut app_data.state_map);
let draw_ctx = DrawContext::root(&layout);
user_interface.draw(&mut state_ctx, &draw_ctx, frame);
})?;
Ok(())
}
|
