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
40// Potential idea:
41// - Rename this to "BreadcrumbToolbar" or something
42// - Create a wrapping "Breadcrumb" struct for Vec<BreadcrumbText>
43// - Implement render for _that_ breadcrumb struct.
44// - Call that from here to eliminate much of the logic.
45impl Render for Breadcrumbs {
46 fn render(&mut self, window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
47 const MAX_SEGMENTS: usize = 12;
48
49 let element = h_flex()
50 .id("breadcrumb-container")
51 .flex_grow()
52 .overflow_x_scroll()
53 .text_ui(cx);
54
55 let Some(active_item) = self.active_item.as_ref() else {
56 return element;
57 };
58
59 // Begin - logic we should copy/move
60 let Some(mut segments) = active_item.breadcrumbs(cx.theme(), cx) else {
61 return element;
62 };
63
64 let prefix_end_ix = cmp::min(segments.len(), MAX_SEGMENTS / 2);
65 let suffix_start_ix = cmp::max(
66 prefix_end_ix,
67 segments.len().saturating_sub(MAX_SEGMENTS / 2),
68 );
69
70 if suffix_start_ix > prefix_end_ix {
71 segments.splice(
72 prefix_end_ix..suffix_start_ix,
73 Some(BreadcrumbText {
74 text: "⋯".into(),
75 highlights: None,
76 font: None,
77 }),
78 );
79 }
80
81 let highlighted_segments = segments.into_iter().enumerate().map(|(index, segment)| {
82 let mut text_style = window.text_style();
83 if let Some(ref font) = segment.font {
84 text_style.font_family = font.family.clone();
85 text_style.font_features = font.features.clone();
86 text_style.font_style = font.style;
87 text_style.font_weight = font.weight;
88 }
89 text_style.color = Color::Muted.color(cx);
90
91 if index == 0
92 && !TabBarSettings::get_global(cx).show
93 && active_item.is_dirty(cx)
94 && let Some(styled_element) = apply_dirty_filename_style(&segment, &text_style, cx)
95 {
96 return styled_element;
97 }
98
99 StyledText::new(segment.text.replace('\n', "⏎"))
100 .with_default_highlights(&text_style, segment.highlights.unwrap_or_default())
101 .into_any()
102 });
103 let breadcrumbs = Itertools::intersperse_with(highlighted_segments, || {
104 Label::new("›").color(Color::Placeholder).into_any_element()
105 });
106
107 let breadcrumbs_stack = h_flex().gap_1().children(breadcrumbs);
108
109 let prefix_element = active_item.breadcrumb_prefix(window, cx);
110
111 let breadcrumbs = if let Some(prefix) = prefix_element {
112 h_flex().gap_1p5().child(prefix).child(breadcrumbs_stack)
113 } else {
114 breadcrumbs_stack
115 };
116
117 match active_item
118 .downcast::<Editor>()
119 .map(|editor| editor.downgrade())
120 {
121 Some(editor) => element.child(
122 ButtonLike::new("toggle outline view")
123 .child(breadcrumbs)
124 .style(ButtonStyle::Transparent)
125 .on_click({
126 let editor = editor.clone();
127 move |_, window, cx| {
128 if let Some((editor, callback)) = editor
129 .upgrade()
130 .zip(zed_actions::outline::TOGGLE_OUTLINE.get())
131 {
132 callback(editor.to_any_view(), window, cx);
133 }
134 }
135 })
136 .tooltip(move |_window, cx| {
137 if let Some(editor) = editor.upgrade() {
138 let focus_handle = editor.read(cx).focus_handle(cx);
139 Tooltip::for_action_in(
140 "Show Symbol Outline",
141 &zed_actions::outline::ToggleOutline,
142 &focus_handle,
143 cx,
144 )
145 } else {
146 Tooltip::for_action(
147 "Show Symbol Outline",
148 &zed_actions::outline::ToggleOutline,
149 cx,
150 )
151 }
152 }),
153 ),
154 None => element
155 // Match the height and padding of the `ButtonLike` in the other arm.
156 .h(rems_from_px(22.))
157 .pl_1()
158 .child(breadcrumbs),
159 }
160 // End
161 }
162}
163
164impl ToolbarItemView for Breadcrumbs {
165 fn set_active_pane_item(
166 &mut self,
167 active_pane_item: Option<&dyn ItemHandle>,
168 window: &mut Window,
169 cx: &mut Context<Self>,
170 ) -> ToolbarItemLocation {
171 cx.notify();
172 self.active_item = None;
173
174 let Some(item) = active_pane_item else {
175 return ToolbarItemLocation::Hidden;
176 };
177
178 let this = cx.entity().downgrade();
179 self.subscription = Some(item.subscribe_to_item_events(
180 window,
181 cx,
182 Box::new(move |event, _, cx| {
183 if let ItemEvent::UpdateBreadcrumbs = event {
184 this.update(cx, |this, cx| {
185 cx.notify();
186 if let Some(active_item) = this.active_item.as_ref() {
187 cx.emit(ToolbarItemEvent::ChangeLocation(
188 active_item.breadcrumb_location(cx),
189 ))
190 }
191 })
192 .ok();
193 }
194 }),
195 ));
196 self.active_item = Some(item.boxed_clone());
197 item.breadcrumb_location(cx)
198 }
199
200 fn pane_focus_update(
201 &mut self,
202 pane_focused: bool,
203 _window: &mut Window,
204 _: &mut Context<Self>,
205 ) {
206 self.pane_focused = pane_focused;
207 }
208}
209
210fn apply_dirty_filename_style(
211 segment: &BreadcrumbText,
212 text_style: &gpui::TextStyle,
213 cx: &mut Context<Breadcrumbs>,
214) -> Option<gpui::AnyElement> {
215 let text = segment.text.replace('\n', "⏎");
216
217 let filename_position = std::path::Path::new(&segment.text)
218 .file_name()
219 .and_then(|f| {
220 let filename_str = f.to_string_lossy();
221 segment.text.rfind(filename_str.as_ref())
222 })?;
223
224 let bold_weight = FontWeight::BOLD;
225 let default_color = Color::Default.color(cx);
226
227 if filename_position == 0 {
228 let mut filename_style = text_style.clone();
229 filename_style.font_weight = bold_weight;
230 filename_style.color = default_color;
231
232 return Some(
233 StyledText::new(text)
234 .with_default_highlights(&filename_style, [])
235 .into_any(),
236 );
237 }
238
239 let highlight_style = gpui::HighlightStyle {
240 font_weight: Some(bold_weight),
241 color: Some(default_color),
242 ..Default::default()
243 };
244
245 let highlight = vec![(filename_position..text.len(), highlight_style)];
246 Some(
247 StyledText::new(text)
248 .with_default_highlights(text_style, highlight)
249 .into_any(),
250 )
251}