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_stack, v_stack};
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 /// Number of times toolbar's height will be repeated to get the effective height.
23 /// Useful when multiple rows one under each other are needed.
24 /// The rows have the same width and act as a whole when reacting to resizes and similar events.
25 fn row_count(&self, _cx: &WindowContext) -> usize {
26 1
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 cx: &mut WindowContext,
37 ) -> ToolbarItemLocation;
38 fn focus_changed(&mut self, pane_focused: bool, cx: &mut WindowContext);
39 fn row_count(&self, cx: &WindowContext) -> usize;
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().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, cx: &mut ViewContext<Self>) -> impl IntoElement {
97 if !self.has_any_visible_items() {
98 return div();
99 }
100
101 let secondary_item = self.secondary_items().next().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_stack()
107 .p_2()
108 .when(has_left_items || has_right_items, |this| this.gap_2())
109 .border_b()
110 .border_color(cx.theme().colors().border_variant)
111 .bg(cx.theme().colors().toolbar_background)
112 .child(
113 h_stack()
114 .justify_between()
115 .when(has_left_items, |this| {
116 this.child(
117 h_stack()
118 .flex_1()
119 .justify_start()
120 .children(self.left_items().map(|item| item.to_any())),
121 )
122 })
123 .when(has_right_items, |this| {
124 this.child(
125 h_stack()
126 .flex_1()
127 .justify_end()
128 .children(self.right_items().map(|item| item.to_any())),
129 )
130 }),
131 )
132 .children(secondary_item)
133 }
134}
135
136impl Toolbar {
137 pub fn new() -> Self {
138 Self {
139 active_item: None,
140 items: Default::default(),
141 hidden: false,
142 can_navigate: true,
143 }
144 }
145
146 pub fn set_can_navigate(&mut self, can_navigate: bool, cx: &mut ViewContext<Self>) {
147 self.can_navigate = can_navigate;
148 cx.notify();
149 }
150
151 pub fn add_item<T>(&mut self, item: View<T>, cx: &mut ViewContext<Self>)
152 where
153 T: 'static + ToolbarItemView,
154 {
155 let location = item.set_active_pane_item(self.active_item.as_deref(), cx);
156 cx.subscribe(&item, |this, item, event, cx| {
157 if let Some((_, current_location)) =
158 this.items.iter_mut().find(|(i, _)| i.id() == item.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
235 fn row_count(&self, cx: &WindowContext) -> usize {
236 self.read(cx).row_count(cx)
237 }
238}