1use editor::Editor;
2use gpui::{
3 Context, Element, EventEmitter, Focusable, FontWeight, IntoElement, ParentElement, Render,
4 StyledText, Subscription, Window,
5};
6use itertools::Itertools;
7use settings::Settings;
8use std::cmp;
9use theme::ActiveTheme;
10use ui::{ButtonLike, ButtonStyle, Label, Tooltip, prelude::*};
11use workspace::{
12 TabBarSettings, ToolbarItemEvent, ToolbarItemLocation, ToolbarItemView,
13 item::{BreadcrumbText, ItemEvent, ItemHandle},
14};
15
16pub struct Breadcrumbs {
17 pane_focused: bool,
18 active_item: Option<Box<dyn ItemHandle>>,
19 subscription: Option<Subscription>,
20}
21
22impl Default for Breadcrumbs {
23 fn default() -> Self {
24 Self::new()
25 }
26}
27
28impl Breadcrumbs {
29 pub fn new() -> Self {
30 Self {
31 pane_focused: false,
32 active_item: Default::default(),
33 subscription: Default::default(),
34 }
35 }
36}
37
38impl EventEmitter<ToolbarItemEvent> for Breadcrumbs {}
39
40impl Render for Breadcrumbs {
41 fn render(&mut self, window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
42 const MAX_SEGMENTS: usize = 12;
43
44 let element = h_flex()
45 .id("breadcrumb-container")
46 .flex_grow()
47 .overflow_x_scroll()
48 .text_ui(cx);
49
50 let Some(active_item) = self.active_item.as_ref() else {
51 return element;
52 };
53
54 let Some(mut segments) = active_item.breadcrumbs(cx.theme(), cx) else {
55 return element;
56 };
57
58 let prefix_end_ix = cmp::min(segments.len(), MAX_SEGMENTS / 2);
59 let suffix_start_ix = cmp::max(
60 prefix_end_ix,
61 segments.len().saturating_sub(MAX_SEGMENTS / 2),
62 );
63
64 if suffix_start_ix > prefix_end_ix {
65 segments.splice(
66 prefix_end_ix..suffix_start_ix,
67 Some(BreadcrumbText {
68 text: "⋯".into(),
69 highlights: None,
70 font: None,
71 }),
72 );
73 }
74
75 let highlighted_segments = segments.into_iter().enumerate().map(|(index, segment)| {
76 let mut text_style = window.text_style();
77 if let Some(ref font) = segment.font {
78 text_style.font_family = font.family.clone();
79 text_style.font_features = font.features.clone();
80 text_style.font_style = font.style;
81 text_style.font_weight = font.weight;
82 }
83 text_style.color = Color::Muted.color(cx);
84
85 if index == 0
86 && !TabBarSettings::get_global(cx).show
87 && active_item.is_dirty(cx)
88 && let Some(styled_element) = apply_dirty_filename_style(&segment, &text_style, cx)
89 {
90 return styled_element;
91 }
92
93 StyledText::new(segment.text.replace('\n', "⏎"))
94 .with_default_highlights(&text_style, segment.highlights.unwrap_or_default())
95 .into_any()
96 });
97 let breadcrumbs = Itertools::intersperse_with(highlighted_segments, || {
98 Label::new("›").color(Color::Placeholder).into_any_element()
99 });
100
101 let breadcrumbs_stack = h_flex().gap_1().children(breadcrumbs);
102
103 match active_item
104 .downcast::<Editor>()
105 .map(|editor| editor.downgrade())
106 {
107 Some(editor) => element.child(
108 ButtonLike::new("toggle outline view")
109 .child(breadcrumbs_stack)
110 .style(ButtonStyle::Transparent)
111 .on_click({
112 let editor = editor.clone();
113 move |_, window, cx| {
114 if let Some((editor, callback)) = editor
115 .upgrade()
116 .zip(zed_actions::outline::TOGGLE_OUTLINE.get())
117 {
118 callback(editor.to_any(), window, cx);
119 }
120 }
121 })
122 .tooltip(move |window, cx| {
123 if let Some(editor) = editor.upgrade() {
124 let focus_handle = editor.read(cx).focus_handle(cx);
125 Tooltip::for_action_in(
126 "Show Symbol Outline",
127 &zed_actions::outline::ToggleOutline,
128 &focus_handle,
129 window,
130 cx,
131 )
132 } else {
133 Tooltip::for_action(
134 "Show Symbol Outline",
135 &zed_actions::outline::ToggleOutline,
136 window,
137 cx,
138 )
139 }
140 }),
141 ),
142 None => element
143 // Match the height and padding of the `ButtonLike` in the other arm.
144 .h(rems_from_px(22.))
145 .pl_1()
146 .child(breadcrumbs_stack),
147 }
148 }
149}
150
151impl ToolbarItemView for Breadcrumbs {
152 fn set_active_pane_item(
153 &mut self,
154 active_pane_item: Option<&dyn ItemHandle>,
155 window: &mut Window,
156 cx: &mut Context<Self>,
157 ) -> ToolbarItemLocation {
158 cx.notify();
159 self.active_item = None;
160
161 let Some(item) = active_pane_item else {
162 return ToolbarItemLocation::Hidden;
163 };
164
165 let this = cx.entity().downgrade();
166 self.subscription = Some(item.subscribe_to_item_events(
167 window,
168 cx,
169 Box::new(move |event, _, cx| {
170 if let ItemEvent::UpdateBreadcrumbs = event {
171 this.update(cx, |this, cx| {
172 cx.notify();
173 if let Some(active_item) = this.active_item.as_ref() {
174 cx.emit(ToolbarItemEvent::ChangeLocation(
175 active_item.breadcrumb_location(cx),
176 ))
177 }
178 })
179 .ok();
180 }
181 }),
182 ));
183 self.active_item = Some(item.boxed_clone());
184 item.breadcrumb_location(cx)
185 }
186
187 fn pane_focus_update(
188 &mut self,
189 pane_focused: bool,
190 _window: &mut Window,
191 _: &mut Context<Self>,
192 ) {
193 self.pane_focused = pane_focused;
194 }
195}
196
197fn apply_dirty_filename_style(
198 segment: &BreadcrumbText,
199 text_style: &gpui::TextStyle,
200 cx: &mut Context<Breadcrumbs>,
201) -> Option<gpui::AnyElement> {
202 let text = segment.text.replace('\n', "⏎");
203
204 let filename_position = std::path::Path::new(&segment.text)
205 .file_name()
206 .and_then(|f| {
207 let filename_str = f.to_string_lossy();
208 segment.text.rfind(filename_str.as_ref())
209 })?;
210
211 let bold_weight = FontWeight::BOLD;
212 let default_color = Color::Default.color(cx);
213
214 if filename_position == 0 {
215 let mut filename_style = text_style.clone();
216 filename_style.font_weight = bold_weight;
217 filename_style.color = default_color;
218
219 return Some(
220 StyledText::new(text)
221 .with_default_highlights(&filename_style, [])
222 .into_any(),
223 );
224 }
225
226 let highlight_style = gpui::HighlightStyle {
227 font_weight: Some(bold_weight),
228 color: Some(default_color),
229 ..Default::default()
230 };
231
232 let highlight = vec![(filename_position..text.len(), highlight_style)];
233 Some(
234 StyledText::new(text)
235 .with_default_highlights(text_style, highlight)
236 .into_any(),
237 )
238}