1use std::{cell::RefCell, rc::Rc};
2
3use gpui::{
4 overlay, point, px, rems, AnchorCorner, AnyElement, Bounds, DismissEvent, DispatchPhase,
5 Element, ElementId, InteractiveBounds, IntoElement, LayoutId, ManagedView, MouseDownEvent,
6 ParentElement, Pixels, Point, View, VisualContext, WindowContext,
7};
8
9use crate::{Clickable, Selectable};
10
11pub trait PopoverTrigger: IntoElement + Clickable + Selectable + 'static {}
12
13impl<T: IntoElement + Clickable + Selectable + 'static> PopoverTrigger for T {}
14
15pub struct PopoverMenu<M: ManagedView> {
16 id: ElementId,
17 child_builder: Option<
18 Box<
19 dyn FnOnce(
20 Rc<RefCell<Option<View<M>>>>,
21 Option<Rc<dyn Fn(&mut WindowContext) -> Option<View<M>> + 'static>>,
22 ) -> AnyElement
23 + 'static,
24 >,
25 >,
26 menu_builder: Option<Rc<dyn Fn(&mut WindowContext) -> Option<View<M>> + 'static>>,
27 anchor: AnchorCorner,
28 attach: Option<AnchorCorner>,
29 offset: Option<Point<Pixels>>,
30}
31
32impl<M: ManagedView> PopoverMenu<M> {
33 pub fn menu(mut self, f: impl Fn(&mut WindowContext) -> Option<View<M>> + 'static) -> Self {
34 self.menu_builder = Some(Rc::new(f));
35 self
36 }
37
38 pub fn trigger<T: PopoverTrigger>(mut self, t: T) -> Self {
39 self.child_builder = Some(Box::new(|menu, builder| {
40 let open = menu.borrow().is_some();
41 t.selected(open)
42 .when_some(builder, |el, builder| {
43 el.on_click({
44 move |_, cx| {
45 let Some(new_menu) = (builder)(cx) else {
46 return;
47 };
48 let menu2 = menu.clone();
49 let previous_focus_handle = cx.focused();
50
51 cx.subscribe(&new_menu, move |modal, _: &DismissEvent, cx| {
52 if modal.focus_handle(cx).contains_focused(cx) {
53 if previous_focus_handle.is_some() {
54 cx.focus(&previous_focus_handle.as_ref().unwrap())
55 }
56 }
57 *menu2.borrow_mut() = None;
58 cx.notify();
59 })
60 .detach();
61 cx.focus_view(&new_menu);
62 *menu.borrow_mut() = Some(new_menu);
63 }
64 })
65 })
66 .into_any_element()
67 }));
68 self
69 }
70
71 /// anchor defines which corner of the menu to anchor to the attachment point
72 /// (by default the cursor position, but see attach)
73 pub fn anchor(mut self, anchor: AnchorCorner) -> Self {
74 self.anchor = anchor;
75 self
76 }
77
78 /// attach defines which corner of the handle to attach the menu's anchor to
79 pub fn attach(mut self, attach: AnchorCorner) -> Self {
80 self.attach = Some(attach);
81 self
82 }
83
84 /// offset offsets the position of the content by that many pixels.
85 pub fn offset(mut self, offset: Point<Pixels>) -> Self {
86 self.offset = Some(offset);
87 self
88 }
89
90 fn resolved_attach(&self) -> AnchorCorner {
91 self.attach.unwrap_or_else(|| match self.anchor {
92 AnchorCorner::TopLeft => AnchorCorner::BottomLeft,
93 AnchorCorner::TopRight => AnchorCorner::BottomRight,
94 AnchorCorner::BottomLeft => AnchorCorner::TopLeft,
95 AnchorCorner::BottomRight => AnchorCorner::TopRight,
96 })
97 }
98
99 fn resolved_offset(&self, cx: &WindowContext) -> Point<Pixels> {
100 self.offset.unwrap_or_else(|| {
101 // Default offset = 4px padding + 1px border
102 let offset = rems(5. / 16.) * cx.rem_size();
103 match self.anchor {
104 AnchorCorner::TopRight | AnchorCorner::BottomRight => point(offset, px(0.)),
105 AnchorCorner::TopLeft | AnchorCorner::BottomLeft => point(-offset, px(0.)),
106 }
107 })
108 }
109}
110
111pub fn popover_menu<M: ManagedView>(id: impl Into<ElementId>) -> PopoverMenu<M> {
112 PopoverMenu {
113 id: id.into(),
114 child_builder: None,
115 menu_builder: None,
116 anchor: AnchorCorner::TopLeft,
117 attach: None,
118 offset: None,
119 }
120}
121
122pub struct PopoverMenuState<M> {
123 child_layout_id: Option<LayoutId>,
124 child_element: Option<AnyElement>,
125 child_bounds: Option<Bounds<Pixels>>,
126 menu_element: Option<AnyElement>,
127 menu: Rc<RefCell<Option<View<M>>>>,
128}
129
130impl<M: ManagedView> Element for PopoverMenu<M> {
131 type State = PopoverMenuState<M>;
132
133 fn request_layout(
134 &mut self,
135 element_state: Option<Self::State>,
136 cx: &mut WindowContext,
137 ) -> (gpui::LayoutId, Self::State) {
138 let mut menu_layout_id = None;
139
140 let (menu, child_bounds) = if let Some(element_state) = element_state {
141 (element_state.menu, element_state.child_bounds)
142 } else {
143 (Rc::default(), None)
144 };
145
146 let menu_element = menu.borrow_mut().as_mut().map(|menu| {
147 let mut overlay = overlay().snap_to_window().anchor(self.anchor);
148
149 if let Some(child_bounds) = child_bounds {
150 overlay = overlay.position(
151 self.resolved_attach().corner(child_bounds) + self.resolved_offset(cx),
152 );
153 }
154
155 let mut element = overlay.child(menu.clone()).into_any();
156 menu_layout_id = Some(element.request_layout(cx));
157 element
158 });
159
160 let mut child_element = self
161 .child_builder
162 .take()
163 .map(|child_builder| (child_builder)(menu.clone(), self.menu_builder.clone()));
164
165 let child_layout_id = child_element
166 .as_mut()
167 .map(|child_element| child_element.request_layout(cx));
168
169 let layout_id = cx.request_layout(
170 &gpui::Style::default(),
171 menu_layout_id.into_iter().chain(child_layout_id),
172 );
173
174 (
175 layout_id,
176 PopoverMenuState {
177 menu,
178 child_element,
179 child_layout_id,
180 menu_element,
181 child_bounds,
182 },
183 )
184 }
185
186 fn paint(
187 &mut self,
188 _: Bounds<gpui::Pixels>,
189 element_state: &mut Self::State,
190 cx: &mut WindowContext,
191 ) {
192 if let Some(mut child) = element_state.child_element.take() {
193 child.paint(cx);
194 }
195
196 if let Some(child_layout_id) = element_state.child_layout_id.take() {
197 element_state.child_bounds = Some(cx.layout_bounds(child_layout_id));
198 }
199
200 if let Some(mut menu) = element_state.menu_element.take() {
201 menu.paint(cx);
202
203 if let Some(child_bounds) = element_state.child_bounds {
204 let interactive_bounds = InteractiveBounds {
205 bounds: child_bounds,
206 stacking_order: cx.stacking_order().clone(),
207 };
208
209 // Mouse-downing outside the menu dismisses it, so we don't
210 // want a click on the toggle to re-open it.
211 cx.on_mouse_event(move |e: &MouseDownEvent, phase, cx| {
212 if phase == DispatchPhase::Bubble
213 && interactive_bounds.visibly_contains(&e.position, cx)
214 {
215 cx.stop_propagation()
216 }
217 })
218 }
219 }
220 }
221}
222
223impl<M: ManagedView> IntoElement for PopoverMenu<M> {
224 type Element = Self;
225
226 fn element_id(&self) -> Option<gpui::ElementId> {
227 Some(self.id.clone())
228 }
229
230 fn into_element(self) -> Self::Element {
231 self
232 }
233}