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 .bg(cx.theme().colors().toolbar_background)
115 .when(has_left_items || has_right_items, |this| {
116 this.child(
117 h_flex()
118 .min_h(rems_from_px(24.))
119 .justify_between()
120 .gap(DynamicSpacing::Base08.rems(cx))
121 .when(has_left_items, |this| {
122 this.child(
123 h_flex()
124 .flex_auto()
125 .justify_start()
126 .overflow_x_hidden()
127 .children(self.left_items().map(|item| item.to_any())),
128 )
129 })
130 .when(has_right_items, |this| {
131 this.child(
132 h_flex()
133 .map(|el| {
134 if has_left_items {
135 // We're using `flex_none` here to prevent some flickering that can occur when the
136 // size of the left items container changes.
137 el.flex_none()
138 } else {
139 el.flex_auto()
140 }
141 })
142 .justify_end()
143 .children(self.right_items().map(|item| item.to_any())),
144 )
145 }),
146 )
147 })
148 .children(secondary_items)
149 }
150}
151
152impl Default for Toolbar {
153 fn default() -> Self {
154 Self::new()
155 }
156}
157
158impl Toolbar {
159 pub fn new() -> Self {
160 Self {
161 active_item: None,
162 items: Default::default(),
163 hidden: false,
164 can_navigate: true,
165 }
166 }
167
168 pub fn set_can_navigate(&mut self, can_navigate: bool, cx: &mut Context<Self>) {
169 self.can_navigate = can_navigate;
170 cx.notify();
171 }
172
173 pub fn add_item<T>(&mut self, item: Entity<T>, window: &mut Window, cx: &mut Context<Self>)
174 where
175 T: 'static + ToolbarItemView,
176 {
177 let location = item.set_active_pane_item(self.active_item.as_deref(), window, cx);
178 cx.subscribe(&item, |this, item, event, cx| {
179 if let Some((_, current_location)) = this
180 .items
181 .iter_mut()
182 .find(|(i, _)| i.id() == item.entity_id())
183 {
184 match event {
185 ToolbarItemEvent::ChangeLocation(new_location) => {
186 if new_location != current_location {
187 *current_location = *new_location;
188 cx.notify();
189 }
190 }
191 }
192 }
193 })
194 .detach();
195 self.items.push((Box::new(item), location));
196 cx.notify();
197 }
198
199 pub fn set_active_item(
200 &mut self,
201 item: Option<&dyn ItemHandle>,
202 window: &mut Window,
203 cx: &mut Context<Self>,
204 ) {
205 self.active_item = item.map(|item| item.boxed_clone());
206 self.hidden = self
207 .active_item
208 .as_ref()
209 .map(|item| !item.show_toolbar(cx))
210 .unwrap_or(false);
211
212 for (toolbar_item, current_location) in self.items.iter_mut() {
213 let new_location = toolbar_item.set_active_pane_item(item, window, cx);
214 if new_location != *current_location {
215 *current_location = new_location;
216 cx.notify();
217 }
218 }
219 }
220
221 pub fn focus_changed(&mut self, focused: bool, window: &mut Window, cx: &mut Context<Self>) {
222 for (toolbar_item, _) in self.items.iter_mut() {
223 toolbar_item.focus_changed(focused, window, cx);
224 }
225 }
226
227 pub fn item_of_type<T: ToolbarItemView>(&self) -> Option<Entity<T>> {
228 self.items
229 .iter()
230 .find_map(|(item, _)| item.to_any().downcast().ok())
231 }
232
233 pub fn hidden(&self) -> bool {
234 self.hidden
235 }
236}
237
238impl<T: ToolbarItemView> ToolbarItemViewHandle for Entity<T> {
239 fn id(&self) -> EntityId {
240 self.entity_id()
241 }
242
243 fn to_any(&self) -> AnyView {
244 self.clone().into()
245 }
246
247 fn set_active_pane_item(
248 &self,
249 active_pane_item: Option<&dyn ItemHandle>,
250 window: &mut Window,
251 cx: &mut App,
252 ) -> ToolbarItemLocation {
253 self.update(cx, |this, cx| {
254 this.set_active_pane_item(active_pane_item, window, cx)
255 })
256 }
257
258 fn focus_changed(&mut self, pane_focused: bool, window: &mut Window, cx: &mut App) {
259 self.update(cx, |this, cx| {
260 this.pane_focus_update(pane_focused, window, cx);
261 cx.notify();
262 });
263 }
264}