1use editor::Editor;
2use gpui::{
3 elements::{
4 ChildView, EventHandler, Flex, Label, ParentElement, ScrollTarget, UniformList,
5 UniformListState,
6 },
7 geometry::vector::{vec2f, Vector2F},
8 keymap, AppContext, Axis, Element, ElementBox, Entity, MutableAppContext, RenderContext, Task,
9 View, ViewContext, ViewHandle, WeakViewHandle,
10};
11use settings::Settings;
12use std::cmp;
13use workspace::menu::{
14 Cancel, Confirm, SelectFirst, SelectIndex, SelectLast, SelectNext, SelectPrev,
15};
16
17pub struct Picker<D: PickerDelegate> {
18 delegate: WeakViewHandle<D>,
19 query_editor: ViewHandle<Editor>,
20 list_state: UniformListState,
21 update_task: Option<Task<()>>,
22 max_size: Vector2F,
23}
24
25pub trait PickerDelegate: View {
26 fn match_count(&self) -> usize;
27 fn selected_index(&self) -> usize;
28 fn set_selected_index(&mut self, ix: usize, cx: &mut ViewContext<Self>);
29 fn update_matches(&mut self, query: String, cx: &mut ViewContext<Self>) -> Task<()>;
30 fn confirm(&mut self, cx: &mut ViewContext<Self>);
31 fn dismiss(&mut self, cx: &mut ViewContext<Self>);
32 fn render_match(&self, ix: usize, selected: bool, cx: &AppContext) -> ElementBox;
33 fn center_selection_after_match_updates(&self) -> bool {
34 false
35 }
36}
37
38impl<D: PickerDelegate> Entity for Picker<D> {
39 type Event = ();
40}
41
42impl<D: PickerDelegate> View for Picker<D> {
43 fn ui_name() -> &'static str {
44 "Picker"
45 }
46
47 fn render(&mut self, cx: &mut RenderContext<Self>) -> gpui::ElementBox {
48 let settings = cx.global::<Settings>();
49 let delegate = self.delegate.clone();
50 let match_count = if let Some(delegate) = delegate.upgrade(cx.app) {
51 delegate.read(cx).match_count()
52 } else {
53 0
54 };
55
56 Flex::new(Axis::Vertical)
57 .with_child(
58 ChildView::new(&self.query_editor)
59 .contained()
60 .with_style(settings.theme.selector.input_editor.container)
61 .boxed(),
62 )
63 .with_child(
64 if match_count == 0 {
65 Label::new(
66 "No matches".into(),
67 settings.theme.selector.empty.label.clone(),
68 )
69 .contained()
70 .with_style(settings.theme.selector.empty.container)
71 } else {
72 UniformList::new(
73 self.list_state.clone(),
74 match_count,
75 move |mut range, items, cx| {
76 let cx = cx.as_ref();
77 let delegate = delegate.upgrade(cx).unwrap();
78 let delegate = delegate.read(cx);
79 let selected_ix = delegate.selected_index();
80 range.end = cmp::min(range.end, delegate.match_count());
81 items.extend(range.map(move |ix| {
82 EventHandler::new(delegate.render_match(ix, ix == selected_ix, cx))
83 .on_mouse_down(move |cx| {
84 cx.dispatch_action(SelectIndex(ix));
85 true
86 })
87 .boxed()
88 }));
89 },
90 )
91 .contained()
92 .with_margin_top(6.0)
93 }
94 .flex(1., false)
95 .boxed(),
96 )
97 .contained()
98 .with_style(settings.theme.selector.container)
99 .constrained()
100 .with_max_width(self.max_size.x())
101 .with_max_height(self.max_size.y())
102 .aligned()
103 .top()
104 .named("picker")
105 }
106
107 fn keymap_context(&self, _: &AppContext) -> keymap::Context {
108 let mut cx = Self::default_keymap_context();
109 cx.set.insert("menu".into());
110 cx
111 }
112
113 fn on_focus(&mut self, cx: &mut ViewContext<Self>) {
114 cx.focus(&self.query_editor);
115 }
116}
117
118impl<D: PickerDelegate> Picker<D> {
119 pub fn init(cx: &mut MutableAppContext) {
120 cx.add_action(Self::select_first);
121 cx.add_action(Self::select_last);
122 cx.add_action(Self::select_next);
123 cx.add_action(Self::select_prev);
124 cx.add_action(Self::select_index);
125 cx.add_action(Self::confirm);
126 cx.add_action(Self::cancel);
127 }
128
129 pub fn new(delegate: WeakViewHandle<D>, cx: &mut ViewContext<Self>) -> Self {
130 let query_editor = cx.add_view(|cx| {
131 Editor::single_line(Some(|theme| theme.selector.input_editor.clone()), cx)
132 });
133 cx.subscribe(&query_editor, Self::on_query_editor_event)
134 .detach();
135 let this = Self {
136 query_editor,
137 list_state: Default::default(),
138 update_task: None,
139 delegate,
140 max_size: vec2f(500., 420.),
141 };
142 cx.defer(|this, cx| this.update_matches(cx));
143 this
144 }
145
146 pub fn with_max_size(mut self, width: f32, height: f32) -> Self {
147 self.max_size = vec2f(width, height);
148 self
149 }
150
151 fn on_query_editor_event(
152 &mut self,
153 _: ViewHandle<Editor>,
154 event: &editor::Event,
155 cx: &mut ViewContext<Self>,
156 ) {
157 match event {
158 editor::Event::BufferEdited { .. } => self.update_matches(cx),
159 editor::Event::Blurred => {
160 if let Some(delegate) = self.delegate.upgrade(cx) {
161 delegate.update(cx, |delegate, cx| {
162 delegate.dismiss(cx);
163 })
164 }
165 }
166 _ => {}
167 }
168 }
169
170 fn update_matches(&mut self, cx: &mut ViewContext<Self>) {
171 if let Some(delegate) = self.delegate.upgrade(cx) {
172 let query = self.query_editor.read(cx).text(cx);
173 let update = delegate.update(cx, |d, cx| d.update_matches(query, cx));
174 cx.notify();
175 self.update_task = Some(cx.spawn(|this, mut cx| async move {
176 update.await;
177 this.update(&mut cx, |this, cx| {
178 if let Some(delegate) = this.delegate.upgrade(cx) {
179 let delegate = delegate.read(cx);
180 let index = delegate.selected_index();
181 let target = if delegate.center_selection_after_match_updates() {
182 ScrollTarget::Center(index)
183 } else {
184 ScrollTarget::Show(index)
185 };
186 this.list_state.scroll_to(target);
187 cx.notify();
188 this.update_task.take();
189 }
190 });
191 }));
192 }
193 }
194
195 pub fn select_first(&mut self, _: &SelectFirst, cx: &mut ViewContext<Self>) {
196 if let Some(delegate) = self.delegate.upgrade(cx) {
197 let index = 0;
198 delegate.update(cx, |delegate, cx| delegate.set_selected_index(0, cx));
199 self.list_state.scroll_to(ScrollTarget::Show(index));
200 cx.notify();
201 }
202 }
203
204 pub fn select_index(&mut self, action: &SelectIndex, cx: &mut ViewContext<Self>) {
205 if let Some(delegate) = self.delegate.upgrade(cx) {
206 let index = action.0;
207 delegate.update(cx, |delegate, cx| {
208 delegate.set_selected_index(index, cx);
209 delegate.confirm(cx);
210 });
211 }
212 }
213
214 pub fn select_last(&mut self, _: &SelectLast, cx: &mut ViewContext<Self>) {
215 if let Some(delegate) = self.delegate.upgrade(cx) {
216 let index = delegate.update(cx, |delegate, cx| {
217 let match_count = delegate.match_count();
218 let index = if match_count > 0 { match_count - 1 } else { 0 };
219 delegate.set_selected_index(index, cx);
220 index
221 });
222 self.list_state.scroll_to(ScrollTarget::Show(index));
223 cx.notify();
224 }
225 }
226
227 pub fn select_next(&mut self, _: &SelectNext, cx: &mut ViewContext<Self>) {
228 if let Some(delegate) = self.delegate.upgrade(cx) {
229 let index = delegate.update(cx, |delegate, cx| {
230 let mut selected_index = delegate.selected_index();
231 if selected_index + 1 < delegate.match_count() {
232 selected_index += 1;
233 delegate.set_selected_index(selected_index, cx);
234 }
235 selected_index
236 });
237 self.list_state.scroll_to(ScrollTarget::Show(index));
238 cx.notify();
239 }
240 }
241
242 pub fn select_prev(&mut self, _: &SelectPrev, cx: &mut ViewContext<Self>) {
243 if let Some(delegate) = self.delegate.upgrade(cx) {
244 let index = delegate.update(cx, |delegate, cx| {
245 let mut selected_index = delegate.selected_index();
246 if selected_index > 0 {
247 selected_index -= 1;
248 delegate.set_selected_index(selected_index, cx);
249 }
250 selected_index
251 });
252 self.list_state.scroll_to(ScrollTarget::Show(index));
253 cx.notify();
254 }
255 }
256
257 fn confirm(&mut self, _: &Confirm, cx: &mut ViewContext<Self>) {
258 if let Some(delegate) = self.delegate.upgrade(cx) {
259 delegate.update(cx, |delegate, cx| delegate.confirm(cx));
260 }
261 }
262
263 fn cancel(&mut self, _: &Cancel, cx: &mut ViewContext<Self>) {
264 if let Some(delegate) = self.delegate.upgrade(cx) {
265 delegate.update(cx, |delegate, cx| delegate.dismiss(cx));
266 }
267 }
268}