1use crate::ItemHandle;
2use gpui::{
3 AnyView, Entity, EntityId, EventEmitter, ParentElement as _, Render, Styled, View, ViewContext,
4 WindowContext,
5};
6use ui::prelude::*;
7use ui::{h_flex, v_flex};
8
9pub enum ToolbarItemEvent {
10 ChangeLocation(ToolbarItemLocation),
11}
12
13pub trait ToolbarItemView: Render + EventEmitter<ToolbarItemEvent> {
14 fn set_active_pane_item(
15 &mut self,
16 active_pane_item: Option<&dyn crate::ItemHandle>,
17 cx: &mut ViewContext<Self>,
18 ) -> ToolbarItemLocation;
19
20 fn pane_focus_update(&mut self, _pane_focused: bool, _cx: &mut ViewContext<Self>) {}
21}
22
23trait ToolbarItemViewHandle: Send {
24 fn id(&self) -> EntityId;
25 fn to_any(&self) -> AnyView;
26 fn set_active_pane_item(
27 &self,
28 active_pane_item: Option<&dyn ItemHandle>,
29 cx: &mut WindowContext,
30 ) -> ToolbarItemLocation;
31 fn focus_changed(&mut self, pane_focused: bool, cx: &mut WindowContext);
32}
33
34#[derive(Copy, Clone, Debug, PartialEq)]
35pub enum ToolbarItemLocation {
36 Hidden,
37 PrimaryLeft,
38 PrimaryRight,
39 Secondary,
40}
41
42pub struct Toolbar {
43 active_item: Option<Box<dyn ItemHandle>>,
44 hidden: bool,
45 can_navigate: bool,
46 items: Vec<(Box<dyn ToolbarItemViewHandle>, ToolbarItemLocation)>,
47}
48
49impl Toolbar {
50 fn has_any_visible_items(&self) -> bool {
51 self.items
52 .iter()
53 .any(|(_item, location)| *location != ToolbarItemLocation::Hidden)
54 }
55
56 fn left_items(&self) -> impl Iterator<Item = &dyn ToolbarItemViewHandle> {
57 self.items.iter().filter_map(|(item, location)| {
58 if *location == ToolbarItemLocation::PrimaryLeft {
59 Some(item.as_ref())
60 } else {
61 None
62 }
63 })
64 }
65
66 fn right_items(&self) -> impl Iterator<Item = &dyn ToolbarItemViewHandle> {
67 self.items.iter().filter_map(|(item, location)| {
68 if *location == ToolbarItemLocation::PrimaryRight {
69 Some(item.as_ref())
70 } else {
71 None
72 }
73 })
74 }
75
76 fn secondary_items(&self) -> impl Iterator<Item = &dyn ToolbarItemViewHandle> {
77 self.items.iter().filter_map(|(item, location)| {
78 if *location == ToolbarItemLocation::Secondary {
79 Some(item.as_ref())
80 } else {
81 None
82 }
83 })
84 }
85}
86
87impl Render for Toolbar {
88 fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
89 if !self.has_any_visible_items() {
90 return div();
91 }
92
93 let secondary_item = self.secondary_items().next().map(|item| item.to_any());
94
95 let has_left_items = self.left_items().count() > 0;
96 let has_right_items = self.right_items().count() > 0;
97
98 v_flex()
99 .p(Spacing::Large.rems(cx))
100 .when(has_left_items || has_right_items, |this| {
101 this.gap(Spacing::Large.rems(cx))
102 })
103 .border_b_1()
104 .border_color(cx.theme().colors().border_variant)
105 .bg(cx.theme().colors().toolbar_background)
106 .child(
107 h_flex()
108 .justify_between()
109 .gap(Spacing::Large.rems(cx))
110 .when(has_left_items, |this| {
111 this.child(
112 h_flex()
113 .flex_auto()
114 .justify_start()
115 .overflow_x_hidden()
116 .children(self.left_items().map(|item| item.to_any())),
117 )
118 })
119 .when(has_right_items, |this| {
120 this.child(
121 h_flex()
122 // We're using `flex_none` here to prevent some flickering that can occur when the
123 // size of the left items container changes.
124 .when_else(has_left_items, Div::flex_none, Div::flex_auto)
125 .justify_end()
126 .children(self.right_items().map(|item| item.to_any())),
127 )
128 }),
129 )
130 .children(secondary_item)
131 }
132}
133
134impl Toolbar {
135 pub fn new() -> Self {
136 Self {
137 active_item: None,
138 items: Default::default(),
139 hidden: false,
140 can_navigate: true,
141 }
142 }
143
144 pub fn set_can_navigate(&mut self, can_navigate: bool, cx: &mut ViewContext<Self>) {
145 self.can_navigate = can_navigate;
146 cx.notify();
147 }
148
149 pub fn add_item<T>(&mut self, item: View<T>, cx: &mut ViewContext<Self>)
150 where
151 T: 'static + ToolbarItemView,
152 {
153 let location = item.set_active_pane_item(self.active_item.as_deref(), cx);
154 cx.subscribe(&item, |this, item, event, cx| {
155 if let Some((_, current_location)) = this
156 .items
157 .iter_mut()
158 .find(|(i, _)| i.id() == item.entity_id())
159 {
160 match event {
161 ToolbarItemEvent::ChangeLocation(new_location) => {
162 if new_location != current_location {
163 *current_location = *new_location;
164 cx.notify();
165 }
166 }
167 }
168 }
169 })
170 .detach();
171 self.items.push((Box::new(item), location));
172 cx.notify();
173 }
174
175 pub fn set_active_item(&mut self, item: Option<&dyn ItemHandle>, cx: &mut ViewContext<Self>) {
176 self.active_item = item.map(|item| item.boxed_clone());
177 self.hidden = self
178 .active_item
179 .as_ref()
180 .map(|item| !item.show_toolbar(cx))
181 .unwrap_or(false);
182
183 for (toolbar_item, current_location) in self.items.iter_mut() {
184 let new_location = toolbar_item.set_active_pane_item(item, cx);
185 if new_location != *current_location {
186 *current_location = new_location;
187 cx.notify();
188 }
189 }
190 }
191
192 pub fn focus_changed(&mut self, focused: bool, cx: &mut ViewContext<Self>) {
193 for (toolbar_item, _) in self.items.iter_mut() {
194 toolbar_item.focus_changed(focused, cx);
195 }
196 }
197
198 pub fn item_of_type<T: ToolbarItemView>(&self) -> Option<View<T>> {
199 self.items
200 .iter()
201 .find_map(|(item, _)| item.to_any().downcast().ok())
202 }
203
204 pub fn hidden(&self) -> bool {
205 self.hidden
206 }
207}
208
209impl<T: ToolbarItemView> ToolbarItemViewHandle for View<T> {
210 fn id(&self) -> EntityId {
211 self.entity_id()
212 }
213
214 fn to_any(&self) -> AnyView {
215 self.clone().into()
216 }
217
218 fn set_active_pane_item(
219 &self,
220 active_pane_item: Option<&dyn ItemHandle>,
221 cx: &mut WindowContext,
222 ) -> ToolbarItemLocation {
223 self.update(cx, |this, cx| {
224 this.set_active_pane_item(active_pane_item, cx)
225 })
226 }
227
228 fn focus_changed(&mut self, pane_focused: bool, cx: &mut WindowContext) {
229 self.update(cx, |this, cx| {
230 this.pane_focus_update(pane_focused, cx);
231 cx.notify();
232 });
233 }
234}