258 lines
9.4 KiB
Rust
258 lines
9.4 KiB
Rust
use editor::Editor;
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use gpui::{
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div, prelude::*, uniform_list, AppContext, Div, FocusHandle, FocusableView, MouseButton,
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MouseDownEvent, Render, Task, UniformListScrollHandle, View, ViewContext, WindowContext,
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};
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use std::{cmp, sync::Arc};
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use ui::{prelude::*, v_stack, Color, Divider, Label};
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pub struct Picker<D: PickerDelegate> {
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pub delegate: D,
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scroll_handle: UniformListScrollHandle,
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editor: View<Editor>,
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pending_update_matches: Option<Task<()>>,
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confirm_on_update: Option<bool>,
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}
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pub trait PickerDelegate: Sized + 'static {
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type ListItem: RenderOnce;
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fn match_count(&self) -> usize;
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fn selected_index(&self) -> usize;
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fn set_selected_index(&mut self, ix: usize, cx: &mut ViewContext<Picker<Self>>);
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fn placeholder_text(&self) -> Arc<str>;
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fn update_matches(&mut self, query: String, cx: &mut ViewContext<Picker<Self>>) -> Task<()>;
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fn confirm(&mut self, secondary: bool, cx: &mut ViewContext<Picker<Self>>);
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fn dismissed(&mut self, cx: &mut ViewContext<Picker<Self>>);
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fn render_match(
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&self,
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ix: usize,
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selected: bool,
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cx: &mut ViewContext<Picker<Self>>,
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) -> Self::ListItem;
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}
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impl<D: PickerDelegate> FocusableView for Picker<D> {
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fn focus_handle(&self, cx: &AppContext) -> FocusHandle {
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self.editor.focus_handle(cx)
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}
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}
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impl<D: PickerDelegate> Picker<D> {
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pub fn new(delegate: D, cx: &mut ViewContext<Self>) -> Self {
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let editor = cx.build_view(|cx| {
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let mut editor = Editor::single_line(cx);
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editor.set_placeholder_text(delegate.placeholder_text(), cx);
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editor
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});
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cx.subscribe(&editor, Self::on_input_editor_event).detach();
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let mut this = Self {
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delegate,
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editor,
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scroll_handle: UniformListScrollHandle::new(),
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pending_update_matches: None,
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confirm_on_update: None,
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};
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this.update_matches("".to_string(), cx);
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this
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}
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pub fn focus(&self, cx: &mut WindowContext) {
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self.editor.update(cx, |editor, cx| editor.focus(cx));
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}
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pub fn select_next(&mut self, _: &menu::SelectNext, cx: &mut ViewContext<Self>) {
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let count = self.delegate.match_count();
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if count > 0 {
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let index = self.delegate.selected_index();
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let ix = cmp::min(index + 1, count - 1);
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self.delegate.set_selected_index(ix, cx);
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self.scroll_handle.scroll_to_item(ix);
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cx.notify();
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}
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}
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fn select_prev(&mut self, _: &menu::SelectPrev, cx: &mut ViewContext<Self>) {
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let count = self.delegate.match_count();
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if count > 0 {
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let index = self.delegate.selected_index();
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let ix = index.saturating_sub(1);
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self.delegate.set_selected_index(ix, cx);
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self.scroll_handle.scroll_to_item(ix);
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cx.notify();
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}
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}
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fn select_first(&mut self, _: &menu::SelectFirst, cx: &mut ViewContext<Self>) {
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let count = self.delegate.match_count();
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if count > 0 {
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self.delegate.set_selected_index(0, cx);
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self.scroll_handle.scroll_to_item(0);
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cx.notify();
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}
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}
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fn select_last(&mut self, _: &menu::SelectLast, cx: &mut ViewContext<Self>) {
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let count = self.delegate.match_count();
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if count > 0 {
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self.delegate.set_selected_index(count - 1, cx);
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self.scroll_handle.scroll_to_item(count - 1);
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cx.notify();
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}
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}
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pub fn cycle_selection(&mut self, cx: &mut ViewContext<Self>) {
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let count = self.delegate.match_count();
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let index = self.delegate.selected_index();
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let new_index = if index + 1 == count { 0 } else { index + 1 };
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self.delegate.set_selected_index(new_index, cx);
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self.scroll_handle.scroll_to_item(new_index);
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cx.notify();
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}
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fn cancel(&mut self, _: &menu::Cancel, cx: &mut ViewContext<Self>) {
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self.delegate.dismissed(cx);
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}
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fn confirm(&mut self, _: &menu::Confirm, cx: &mut ViewContext<Self>) {
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if self.pending_update_matches.is_some() {
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self.confirm_on_update = Some(false)
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} else {
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self.delegate.confirm(false, cx);
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}
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}
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fn secondary_confirm(&mut self, _: &menu::SecondaryConfirm, cx: &mut ViewContext<Self>) {
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if self.pending_update_matches.is_some() {
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self.confirm_on_update = Some(true)
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} else {
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self.delegate.confirm(true, cx);
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}
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}
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fn handle_click(&mut self, ix: usize, secondary: bool, cx: &mut ViewContext<Self>) {
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cx.stop_propagation();
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cx.prevent_default();
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self.delegate.set_selected_index(ix, cx);
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self.delegate.confirm(secondary, cx);
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}
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fn on_input_editor_event(
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&mut self,
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_: View<Editor>,
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event: &editor::EditorEvent,
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cx: &mut ViewContext<Self>,
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) {
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if let editor::EditorEvent::BufferEdited = event {
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let query = self.editor.read(cx).text(cx);
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self.update_matches(query, cx);
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}
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}
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pub fn refresh(&mut self, cx: &mut ViewContext<Self>) {
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let query = self.editor.read(cx).text(cx);
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self.update_matches(query, cx);
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}
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pub fn update_matches(&mut self, query: String, cx: &mut ViewContext<Self>) {
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let update = self.delegate.update_matches(query, cx);
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self.matches_updated(cx);
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self.pending_update_matches = Some(cx.spawn(|this, mut cx| async move {
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update.await;
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this.update(&mut cx, |this, cx| {
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this.matches_updated(cx);
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})
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.ok();
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}));
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}
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fn matches_updated(&mut self, cx: &mut ViewContext<Self>) {
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let index = self.delegate.selected_index();
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self.scroll_handle.scroll_to_item(index);
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self.pending_update_matches = None;
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if let Some(secondary) = self.confirm_on_update.take() {
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self.delegate.confirm(secondary, cx);
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}
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cx.notify();
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}
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}
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impl<D: PickerDelegate> Render for Picker<D> {
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type Element = Div;
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fn render(&mut self, cx: &mut ViewContext<Self>) -> Self::Element {
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div()
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.key_context("picker")
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.size_full()
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.elevation_2(cx)
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.on_action(cx.listener(Self::select_next))
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.on_action(cx.listener(Self::select_prev))
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.on_action(cx.listener(Self::select_first))
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.on_action(cx.listener(Self::select_last))
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.on_action(cx.listener(Self::cancel))
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.on_action(cx.listener(Self::confirm))
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.on_action(cx.listener(Self::secondary_confirm))
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.child(
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v_stack()
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.py_0p5()
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.px_1()
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.child(div().px_1().py_0p5().child(self.editor.clone())),
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)
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.child(Divider::horizontal())
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.when(self.delegate.match_count() > 0, |el| {
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el.child(
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v_stack()
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.p_1()
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.grow()
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.child(
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uniform_list(
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cx.view().clone(),
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"candidates",
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self.delegate.match_count(),
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{
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let selected_index = self.delegate.selected_index();
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move |picker, visible_range, cx| {
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visible_range
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.map(|ix| {
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div()
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.on_mouse_down(
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MouseButton::Left,
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cx.listener(move |this, event: &MouseDownEvent, cx| {
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this.handle_click(
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ix,
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event.modifiers.command,
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cx,
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)
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}),
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)
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.child(picker.delegate.render_match(
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ix,
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ix == selected_index,
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cx,
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))
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})
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.collect()
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}
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},
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)
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.track_scroll(self.scroll_handle.clone()),
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)
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.max_h_72()
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.overflow_hidden(),
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)
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})
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.when(self.delegate.match_count() == 0, |el| {
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el.child(
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v_stack().p_1().grow().child(
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div()
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.px_1()
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.child(Label::new("No matches").color(Color::Muted)),
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),
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)
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})
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}
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}
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