142 lines
4.3 KiB
Rust
142 lines
4.3 KiB
Rust
// Each component declares it's own size constraints and gets fitted based on it's parent.
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// Q: how does this work with popups?
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// cursive does compositor.screen_mut().add_layer_at(pos::absolute(x, y), <component>)
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use crossterm::event::Event;
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use helix_core::Position;
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use smol::Executor;
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use tui::{buffer::Buffer as Surface, layout::Rect};
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pub type Callback = Box<dyn FnOnce(&mut Compositor, &mut Editor)>;
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// --> EventResult should have a callback that takes a context with methods like .popup(),
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// .prompt() etc. That way we can abstract it from the renderer.
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// Q: How does this interact with popups where we need to be able to specify the rendering of the
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// popup?
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// A: It could just take a textarea.
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//
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// If Compositor was specified in the callback that's then problematic because of
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// Cursive-inspired
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pub enum EventResult {
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Ignored,
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Consumed(Option<Callback>),
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}
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use helix_view::{Editor, View};
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use crate::application::LspCallbacks;
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pub struct Context<'a> {
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pub editor: &'a mut Editor,
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pub executor: &'static smol::Executor<'static>,
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pub scroll: Option<usize>,
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pub callbacks: &'a mut LspCallbacks,
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}
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pub trait Component {
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/// Process input events, return true if handled.
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fn handle_event(&mut self, event: Event, ctx: &mut Context) -> EventResult {
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EventResult::Ignored
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}
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// , args: ()
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/// Should redraw? Useful for saving redraw cycles if we know component didn't change.
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fn should_update(&self) -> bool {
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true
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}
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/// Render the component onto the provided surface.
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fn render(&self, area: Rect, frame: &mut Surface, ctx: &mut Context);
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fn cursor_position(&self, area: Rect, ctx: &Editor) -> Option<Position> {
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None
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}
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/// May be used by the parent component to compute the child area.
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/// viewport is the maximum allowed area, and the child should stay within those bounds.
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fn required_size(&mut self, viewport: (u16, u16)) -> Option<(u16, u16)> {
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// TODO: for scrolling, the scroll wrapper should place a size + offset on the Context
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// that way render can use it
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None
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}
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}
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use anyhow::Error;
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use std::io::stdout;
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use tui::backend::CrosstermBackend;
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type Terminal = crate::terminal::Terminal<CrosstermBackend<std::io::Stdout>>;
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pub struct Compositor {
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layers: Vec<Box<dyn Component>>,
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terminal: Terminal,
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}
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impl Compositor {
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pub fn new() -> Result<Self, Error> {
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let backend = CrosstermBackend::new(stdout());
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let mut terminal = Terminal::new(backend)?;
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Ok(Self {
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layers: Vec::new(),
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terminal,
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})
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}
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pub fn size(&self) -> Rect {
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self.terminal.size().expect("couldn't get terminal size")
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}
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pub fn resize(&mut self, width: u16, height: u16) {
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self.terminal
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.resize(Rect::new(0, 0, width, height))
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.expect("Unable to resize terminal")
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}
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pub fn push(&mut self, layer: Box<dyn Component>) {
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self.layers.push(layer);
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}
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pub fn pop(&mut self) {
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self.layers.pop();
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}
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pub fn handle_event(&mut self, event: Event, cx: &mut Context) -> bool {
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// propagate events through the layers until we either find a layer that consumes it or we
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// run out of layers (event bubbling)
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for layer in self.layers.iter_mut().rev() {
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match layer.handle_event(event, cx) {
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EventResult::Consumed(Some(callback)) => {
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callback(self, cx.editor);
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return true;
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}
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EventResult::Consumed(None) => return true,
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EventResult::Ignored => false,
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};
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}
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false
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}
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pub fn render(&mut self, cx: &mut Context) {
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let area = self.size();
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let surface = self.terminal.current_buffer_mut();
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for layer in &self.layers {
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layer.render(area, surface, cx)
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}
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let pos = self
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.cursor_position(area, cx.editor)
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.map(|pos| (pos.col as u16, pos.row as u16));
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self.terminal.draw(pos);
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}
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pub fn cursor_position(&self, area: Rect, editor: &Editor) -> Option<Position> {
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for layer in self.layers.iter().rev() {
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if let Some(pos) = layer.cursor_position(area, editor) {
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return Some(pos);
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}
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}
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None
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}
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}
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