mirror of https://github.com/helix-editor/helix
popup: wip work on completion popups
Blaž Hrastnik
4 years ago
parent
755632f231
commit
d4b85ce18d
@ -0,0 +1,189 @@
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use crate::compositor::{Component, Compositor, Context, EventResult};
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use crossterm::event::{Event, KeyCode, KeyEvent, KeyModifiers};
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use tui::buffer::Buffer as Surface;
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use tui::{
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layout::Rect,
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style::{Color, Style},
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widgets::{Block, Borders},
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};
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use std::borrow::Cow;
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use helix_core::Position;
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use helix_view::Editor;
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// TODO: factor out a popup component that we can reuse for displaying docs on autocomplete,
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// diagnostics popups, etc.
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pub struct Menu<T> {
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options: Vec<T>,
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cursor: usize,
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position: Position,
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format_fn: Box<dyn Fn(&T) -> Cow<str>>,
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callback_fn: Box<dyn Fn(&mut Editor, Option<&T>, MenuEvent)>,
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}
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impl<T> Menu<T> {
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// TODO: it's like a slimmed down picker, share code? (picker = menu + prompt with different
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// rendering)
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pub fn new(
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options: Vec<T>,
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format_fn: impl Fn(&T) -> Cow<str> + 'static,
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callback_fn: impl Fn(&mut Editor, Option<&T>, MenuEvent) + 'static,
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) -> Self {
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Self {
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options,
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cursor: 0,
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position: Position::default(),
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format_fn: Box::new(format_fn),
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callback_fn: Box::new(callback_fn),
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}
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}
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pub fn set_position(&mut self, pos: Position) {
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self.position = pos;
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}
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pub fn move_up(&mut self) {
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self.cursor = self.cursor.saturating_sub(1);
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}
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pub fn move_down(&mut self) {
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// TODO: len - 1
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if self.cursor < self.options.len() {
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self.cursor += 1;
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}
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}
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pub fn selection(&self) -> Option<&T> {
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self.options.get(self.cursor)
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}
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}
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use super::PromptEvent as MenuEvent;
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impl<T> Component for Menu<T> {
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fn handle_event(&mut self, event: Event, cx: &mut Context) -> EventResult {
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let event = match event {
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Event::Key(event) => event,
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_ => return EventResult::Ignored,
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};
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let close_fn = EventResult::Consumed(Some(Box::new(
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|compositor: &mut Compositor, editor: &mut Editor| {
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// remove the layer
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compositor.pop();
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},
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)));
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match event {
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// esc or ctrl-c aborts the completion and closes the menu
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KeyEvent {
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code: KeyCode::Esc, ..
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}
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| KeyEvent {
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code: KeyCode::Char('c'),
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modifiers: KeyModifiers::CONTROL,
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} => {
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(self.callback_fn)(cx.editor, self.selection(), MenuEvent::Abort);
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return close_fn;
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}
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// arrow up/ctrl-p/shift-tab prev completion choice (including updating the doc)
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KeyEvent {
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code: KeyCode::Tab,
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modifiers: KeyModifiers::SHIFT,
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}
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| KeyEvent {
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code: KeyCode::Up, ..
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}
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| KeyEvent {
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code: KeyCode::Char('p'),
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modifiers: KeyModifiers::CONTROL,
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} => {
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self.move_up();
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(self.callback_fn)(cx.editor, self.selection(), MenuEvent::Update);
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return EventResult::Consumed(None);
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}
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// arrow down/ctrl-n/tab advances completion choice (including updating the doc)
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KeyEvent {
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code: KeyCode::Tab,
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modifiers: KeyModifiers::NONE,
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}
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| KeyEvent {
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code: KeyCode::Down,
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..
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}
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| KeyEvent {
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code: KeyCode::Char('n'),
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modifiers: KeyModifiers::CONTROL,
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} => {
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self.move_down();
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(self.callback_fn)(cx.editor, self.selection(), MenuEvent::Update);
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return EventResult::Consumed(None);
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}
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KeyEvent {
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code: KeyCode::Enter,
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..
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} => {
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(self.callback_fn)(cx.editor, self.selection(), MenuEvent::Validate);
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return close_fn;
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}
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// KeyEvent {
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// code: KeyCode::Char(c),
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// modifiers: KeyModifiers::NONE,
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// } => {
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// self.insert_char(c);
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// (self.callback_fn)(cx.editor, &self.line, MenuEvent::Update);
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// }
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// / -> edit_filter?
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//
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// enter confirms the match and closes the menu
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// typing filters the menu
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// if we run out of options the menu closes itself
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_ => (),
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}
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// for some events, we want to process them but send ignore, specifically all input except
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// tab/enter/ctrl-k or whatever will confirm the selection/ ctrl-n/ctrl-p for scroll.
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// EventResult::Consumed(None)
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EventResult::Ignored
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}
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fn render(&self, area: Rect, surface: &mut Surface, cx: &mut Context) {
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// render a box at x, y. Width equal to max width of item.
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// initially limit to n items, add support for scrolling
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//
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const MAX: usize = 5;
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let rows = std::cmp::min(self.options.len(), MAX) as u16;
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let area = Rect::new(self.position.col as u16, self.position.row as u16, 30, rows);
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// clear area
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let background = cx.editor.theme.get("ui.popup");
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for y in area.top()..area.bottom() {
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for x in area.left()..area.right() {
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let cell = surface.get_mut(x, y);
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cell.reset();
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// cell.symbol.clear();
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cell.set_style(background);
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}
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}
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// -- Render the contents:
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let style = Style::default().fg(Color::Rgb(164, 160, 232)); // lavender
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let selected = Style::default().fg(Color::Rgb(255, 255, 255));
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for (i, option) in self.options.iter().take(rows as usize).enumerate() {
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// TODO: set bg for the whole row if selected
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surface.set_stringn(
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area.x,
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area.y + i as u16,
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(self.format_fn)(option),
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area.width as usize - 1,
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if i == self.cursor { selected } else { style },
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);
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}
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}
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}
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