1use crate::ItemHandle;
2use gpui::{
3 AnyView, App, Context, Entity, EntityId, EventEmitter, ParentElement as _, Render, Styled,
4 Window,
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 window: &mut Window,
18 cx: &mut Context<Self>,
19 ) -> ToolbarItemLocation;
20
21 fn pane_focus_update(
22 &mut self,
23 _pane_focused: bool,
24 _window: &mut Window,
25 _cx: &mut Context<Self>,
26 ) {
27 }
28}
29
30trait ToolbarItemViewHandle: Send {
31 fn id(&self) -> EntityId;
32 fn to_any(&self) -> AnyView;
33 fn set_active_pane_item(
34 &self,
35 active_pane_item: Option<&dyn ItemHandle>,
36 window: &mut Window,
37 cx: &mut App,
38 ) -> ToolbarItemLocation;
39 fn focus_changed(&mut self, pane_focused: bool, window: &mut Window, cx: &mut App);
40}
41
42#[derive(Copy, Clone, Debug, PartialEq)]
43pub enum ToolbarItemLocation {
44 Hidden,
45 PrimaryLeft,
46 PrimaryRight,
47 Secondary,
48}
49
50pub struct Toolbar {
51 active_item: Option<Box<dyn ItemHandle>>,
52 hidden: bool,
53 can_navigate: bool,
54 items: Vec<(Box<dyn ToolbarItemViewHandle>, ToolbarItemLocation)>,
55}
56
57impl Toolbar {
58 fn has_any_visible_items(&self) -> bool {
59 self.items
60 .iter()
61 .any(|(_item, location)| *location != ToolbarItemLocation::Hidden)
62 }
63
64 fn left_items(&self) -> impl Iterator<Item = &dyn ToolbarItemViewHandle> {
65 self.items.iter().filter_map(|(item, location)| {
66 if *location == ToolbarItemLocation::PrimaryLeft {
67 Some(item.as_ref())
68 } else {
69 None
70 }
71 })
72 }
73
74 fn right_items(&self) -> impl Iterator<Item = &dyn ToolbarItemViewHandle> {
75 self.items.iter().filter_map(|(item, location)| {
76 if *location == ToolbarItemLocation::PrimaryRight {
77 Some(item.as_ref())
78 } else {
79 None
80 }
81 })
82 }
83
84 fn secondary_items(&self) -> impl Iterator<Item = &dyn ToolbarItemViewHandle> {
85 self.items.iter().rev().filter_map(|(item, location)| {
86 if *location == ToolbarItemLocation::Secondary {
87 Some(item.as_ref())
88 } else {
89 None
90 }
91 })
92 }
93}
94
95impl Render for Toolbar {
96 fn render(&mut self, _window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
97 if !self.has_any_visible_items() {
98 return div();
99 }
100
101 let secondary_items = self.secondary_items().map(|item| item.to_any());
102
103 let has_left_items = self.left_items().count() > 0;
104 let has_right_items = self.right_items().count() > 0;
105
106 v_flex()
107 .group("toolbar")
108 .p(DynamicSpacing::Base08.rems(cx))
109 .when(has_left_items || has_right_items, |this| {
110 this.gap(DynamicSpacing::Base08.rems(cx))
111 })
112 .border_b_1()
113 .border_color(cx.theme().colors().border_variant)
114 .relative()
115 .bg(cx.theme().colors().toolbar_background)
116 .when(has_left_items || has_right_items, |this| {
117 this.child(
118 h_flex()
119 .min_h(rems_from_px(24.))
120 .justify_between()
121 .gap(DynamicSpacing::Base08.rems(cx))
122 .when(has_left_items, |this| {
123 this.child(
124 h_flex()
125 .flex_auto()
126 .justify_start()
127 .overflow_x_hidden()
128 .children(self.left_items().map(|item| item.to_any())),
129 )
130 })
131 .when(has_right_items, |this| {
132 this.child(
133 h_flex()
134 .map(|el| {
135 if has_left_items {
136 // We're using `flex_none` here to prevent some flickering that can occur when the
137 // size of the left items container changes.
138 el.flex_none()
139 } else {
140 el.flex_auto()
141 }
142 })
143 .justify_end()
144 .children(self.right_items().map(|item| item.to_any())),
145 )
146 }),
147 )
148 })
149 .children(secondary_items)
150 }
151}
152
153impl Default for Toolbar {
154 fn default() -> Self {
155 Self::new()
156 }
157}
158
159impl Toolbar {
160 pub fn new() -> Self {
161 Self {
162 active_item: None,
163 items: Default::default(),
164 hidden: false,
165 can_navigate: true,
166 }
167 }
168
169 pub fn set_can_navigate(&mut self, can_navigate: bool, cx: &mut Context<Self>) {
170 self.can_navigate = can_navigate;
171 cx.notify();
172 }
173
174 pub fn add_item<T>(&mut self, item: Entity<T>, window: &mut Window, cx: &mut Context<Self>)
175 where
176 T: 'static + ToolbarItemView,
177 {
178 let location = item.set_active_pane_item(self.active_item.as_deref(), window, cx);
179 cx.subscribe(&item, |this, item, event, cx| {
180 if let Some((_, current_location)) = this
181 .items
182 .iter_mut()
183 .find(|(i, _)| i.id() == item.entity_id())
184 {
185 match event {
186 ToolbarItemEvent::ChangeLocation(new_location) => {
187 if new_location != current_location {
188 *current_location = *new_location;
189 cx.notify();
190 }
191 }
192 }
193 }
194 })
195 .detach();
196 self.items.push((Box::new(item), location));
197 cx.notify();
198 }
199
200 pub fn set_active_item(
201 &mut self,
202 item: Option<&dyn ItemHandle>,
203 window: &mut Window,
204 cx: &mut Context<Self>,
205 ) {
206 self.active_item = item.map(|item| item.boxed_clone());
207 self.hidden = self
208 .active_item
209 .as_ref()
210 .map(|item| !item.show_toolbar(cx))
211 .unwrap_or(false);
212
213 for (toolbar_item, current_location) in self.items.iter_mut() {
214 let new_location = toolbar_item.set_active_pane_item(item, window, cx);
215 if new_location != *current_location {
216 *current_location = new_location;
217 cx.notify();
218 }
219 }
220 }
221
222 pub fn focus_changed(&mut self, focused: bool, window: &mut Window, cx: &mut Context<Self>) {
223 for (toolbar_item, _) in self.items.iter_mut() {
224 toolbar_item.focus_changed(focused, window, cx);
225 }
226 }
227
228 pub fn item_of_type<T: ToolbarItemView>(&self) -> Option<Entity<T>> {
229 self.items
230 .iter()
231 .find_map(|(item, _)| item.to_any().downcast().ok())
232 }
233
234 pub fn hidden(&self) -> bool {
235 self.hidden
236 }
237}
238
239impl<T: ToolbarItemView> ToolbarItemViewHandle for Entity<T> {
240 fn id(&self) -> EntityId {
241 self.entity_id()
242 }
243
244 fn to_any(&self) -> AnyView {
245 self.clone().into()
246 }
247
248 fn set_active_pane_item(
249 &self,
250 active_pane_item: Option<&dyn ItemHandle>,
251 window: &mut Window,
252 cx: &mut App,
253 ) -> ToolbarItemLocation {
254 self.update(cx, |this, cx| {
255 this.set_active_pane_item(active_pane_item, window, cx)
256 })
257 }
258
259 fn focus_changed(&mut self, pane_focused: bool, window: &mut Window, cx: &mut App) {
260 self.update(cx, |this, cx| {
261 this.pane_focus_update(pane_focused, window, cx);
262 cx.notify();
263 });
264 }
265}