Rename SelectorModal -> Picker, put it in its own crate

crates/picker/src/picker.rs

@@ -0,0 +1,222 @@
+use editor::Editor;
+use gpui::{
+    elements::{
+        ChildView, Flex, FlexItem, Label, ParentElement, ScrollTarget, UniformList,
+        UniformListState,
+    },
+    keymap, AppContext, Axis, Element, ElementBox, Entity, MutableAppContext, RenderContext, Task,
+    View, ViewContext, ViewHandle, WeakViewHandle,
+};
+use settings::Settings;
+use std::cmp;
+use workspace::menu::{Cancel, Confirm, SelectFirst, SelectLast, SelectNext, SelectPrev};
+
+pub struct Picker<D: PickerDelegate> {
+    delegate: WeakViewHandle<D>,
+    query_editor: ViewHandle<Editor>,
+    list_state: UniformListState,
+}
+
+pub trait PickerDelegate: View {
+    fn match_count(&self) -> usize;
+    fn selected_index(&self) -> usize;
+    fn set_selected_index(&mut self, ix: usize);
+    fn update_matches(&mut self, query: String, cx: &mut ViewContext<Self>) -> Task<()>;
+    fn confirm(&mut self, cx: &mut ViewContext<Self>);
+    fn dismiss(&mut self, cx: &mut ViewContext<Self>);
+    fn render_match(&self, ix: usize, selected: bool, cx: &AppContext) -> ElementBox;
+}
+
+impl<D: PickerDelegate> Entity for Picker<D> {
+    type Event = ();
+}
+
+impl<D: PickerDelegate> View for Picker<D> {
+    fn ui_name() -> &'static str {
+        "Picker"
+    }
+
+    fn render(&mut self, cx: &mut RenderContext<Self>) -> gpui::ElementBox {
+        let settings = cx.global::<Settings>();
+        Flex::new(Axis::Vertical)
+            .with_child(
+                ChildView::new(&self.query_editor)
+                    .contained()
+                    .with_style(settings.theme.selector.input_editor.container)
+                    .boxed(),
+            )
+            .with_child(
+                FlexItem::new(self.render_matches(cx))
+                    .flex(1., false)
+                    .boxed(),
+            )
+            .contained()
+            .with_style(settings.theme.selector.container)
+            .constrained()
+            .with_max_width(500.0)
+            .with_max_height(420.0)
+            .aligned()
+            .top()
+            .named("picker")
+    }
+
+    fn keymap_context(&self, _: &AppContext) -> keymap::Context {
+        let mut cx = Self::default_keymap_context();
+        cx.set.insert("menu".into());
+        cx
+    }
+
+    fn on_focus(&mut self, cx: &mut ViewContext<Self>) {
+        cx.focus(&self.query_editor);
+    }
+}
+
+impl<D: PickerDelegate> Picker<D> {
+    pub fn init(cx: &mut MutableAppContext) {
+        cx.add_action(Self::select_first);
+        cx.add_action(Self::select_last);
+        cx.add_action(Self::select_next);
+        cx.add_action(Self::select_prev);
+        cx.add_action(Self::confirm);
+        cx.add_action(Self::cancel);
+    }
+
+    pub fn new(delegate: WeakViewHandle<D>, cx: &mut ViewContext<Self>) -> Self {
+        let query_editor = cx.add_view(|cx| {
+            Editor::single_line(Some(|theme| theme.selector.input_editor.clone()), cx)
+        });
+        cx.subscribe(&query_editor, Self::on_query_editor_event)
+            .detach();
+
+        Self {
+            delegate,
+            query_editor,
+            list_state: Default::default(),
+        }
+    }
+
+    fn render_matches(&self, cx: &AppContext) -> ElementBox {
+        let delegate = self.delegate.clone();
+        let match_count = if let Some(delegate) = delegate.upgrade(cx) {
+            delegate.read(cx).match_count()
+        } else {
+            0
+        };
+
+        if match_count == 0 {
+            let settings = cx.global::<Settings>();
+            return Label::new(
+                "No matches".into(),
+                settings.theme.selector.empty.label.clone(),
+            )
+            .contained()
+            .with_style(settings.theme.selector.empty.container)
+            .named("empty matches");
+        }
+
+        UniformList::new(
+            self.list_state.clone(),
+            match_count,
+            move |mut range, items, cx| {
+                let cx = cx.as_ref();
+                let delegate = delegate.upgrade(cx).unwrap();
+                let delegate = delegate.read(cx);
+                let selected_ix = delegate.selected_index();
+                range.end = cmp::min(range.end, delegate.match_count());
+                items.extend(range.map(move |ix| delegate.render_match(ix, ix == selected_ix, cx)));
+            },
+        )
+        .contained()
+        .with_margin_top(6.0)
+        .named("matches")
+    }
+
+    fn on_query_editor_event(
+        &mut self,
+        _: ViewHandle<Editor>,
+        event: &editor::Event,
+        cx: &mut ViewContext<Self>,
+    ) {
+        if let Some(delegate) = self.delegate.upgrade(cx) {
+            match event {
+                editor::Event::BufferEdited { .. } => {
+                    let query = self.query_editor.read(cx).text(cx);
+                    let update = delegate.update(cx, |d, cx| d.update_matches(query, cx));
+                    cx.spawn(|this, mut cx| async move {
+                        update.await;
+                        this.update(&mut cx, |_, cx| cx.notify());
+                    })
+                    .detach();
+                }
+                editor::Event::Blurred => delegate.update(cx, |delegate, cx| {
+                    delegate.dismiss(cx);
+                }),
+                _ => {}
+            }
+        }
+    }
+
+    fn select_first(&mut self, _: &SelectFirst, cx: &mut ViewContext<Self>) {
+        if let Some(delegate) = self.delegate.upgrade(cx) {
+            let index = 0;
+            delegate.update(cx, |delegate, _| delegate.set_selected_index(0));
+            self.list_state.scroll_to(ScrollTarget::Show(index));
+            cx.notify();
+        }
+    }
+
+    fn select_last(&mut self, _: &SelectLast, cx: &mut ViewContext<Self>) {
+        if let Some(delegate) = self.delegate.upgrade(cx) {
+            let index = delegate.update(cx, |delegate, _| {
+                let match_count = delegate.match_count();
+                let index = if match_count > 0 { match_count - 1 } else { 0 };
+                delegate.set_selected_index(index);
+                index
+            });
+            self.list_state.scroll_to(ScrollTarget::Show(index));
+            cx.notify();
+        }
+    }
+
+    fn select_next(&mut self, _: &SelectNext, cx: &mut ViewContext<Self>) {
+        if let Some(delegate) = self.delegate.upgrade(cx) {
+            let index = delegate.update(cx, |delegate, _| {
+                let mut selected_index = delegate.selected_index();
+                if selected_index + 1 < delegate.match_count() {
+                    selected_index += 1;
+                    delegate.set_selected_index(selected_index);
+                }
+                selected_index
+            });
+            self.list_state.scroll_to(ScrollTarget::Show(index));
+            cx.notify();
+        }
+    }
+
+    fn select_prev(&mut self, _: &SelectPrev, cx: &mut ViewContext<Self>) {
+        if let Some(delegate) = self.delegate.upgrade(cx) {
+            let index = delegate.update(cx, |delegate, _| {
+                let mut selected_index = delegate.selected_index();
+                if selected_index > 0 {
+                    selected_index -= 1;
+                    delegate.set_selected_index(selected_index);
+                }
+                selected_index
+            });
+            self.list_state.scroll_to(ScrollTarget::Show(index));
+            cx.notify();
+        }
+    }
+
+    fn confirm(&mut self, _: &Confirm, cx: &mut ViewContext<Self>) {
+        if let Some(delegate) = self.delegate.upgrade(cx) {
+            delegate.update(cx, |delegate, cx| delegate.confirm(cx));
+        }
+    }
+
+    fn cancel(&mut self, _: &Cancel, cx: &mut ViewContext<Self>) {
+        if let Some(delegate) = self.delegate.upgrade(cx) {
+            delegate.update(cx, |delegate, cx| delegate.dismiss(cx));
+        }
+    }
+}