1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
use gpui::{AnyElement, ScrollHandle};
use smallvec::SmallVec;
use crate::Tab;
use crate::prelude::*;
/// Visual style for [`TabBar`] and its child [`Tab`]s.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub enum TabBarStyle {
/// Bottom-border container line; the active tab shows a colored
/// underline. Preserves the existing default look for current callers.
#[default]
Underline,
/// Rounded pill container; the active tab shows a raised pill background.
Pills,
}
#[derive(IntoElement, RegisterComponent)]
pub struct TabBar {
id: ElementId,
style: TabBarStyle,
start_children: SmallVec<[AnyElement; 2]>,
children: SmallVec<[AnyElement; 2]>,
end_children: SmallVec<[AnyElement; 2]>,
scroll_handle: Option<ScrollHandle>,
}
impl TabBar {
pub fn new(id: impl Into<ElementId>) -> Self {
Self {
id: id.into(),
style: TabBarStyle::default(),
start_children: SmallVec::new(),
children: SmallVec::new(),
end_children: SmallVec::new(),
scroll_handle: None,
}
}
/// Sets the visual style (default [`TabBarStyle::Underline`]).
pub fn style(mut self, style: TabBarStyle) -> Self {
self.style = style;
self
}
pub fn track_scroll(mut self, scroll_handle: &ScrollHandle) -> Self {
self.scroll_handle = Some(scroll_handle.clone());
self
}
pub fn start_children_mut(&mut self) -> &mut SmallVec<[AnyElement; 2]> {
&mut self.start_children
}
pub fn start_child(mut self, start_child: impl IntoElement) -> Self
where
Self: Sized,
{
self.start_children_mut()
.push(start_child.into_element().into_any());
self
}
pub fn start_children(
mut self,
start_children: impl IntoIterator<Item = impl IntoElement>,
) -> Self
where
Self: Sized,
{
self.start_children_mut().extend(
start_children
.into_iter()
.map(|child| child.into_any_element()),
);
self
}
pub fn end_children_mut(&mut self) -> &mut SmallVec<[AnyElement; 2]> {
&mut self.end_children
}
pub fn end_child(mut self, end_child: impl IntoElement) -> Self
where
Self: Sized,
{
self.end_children_mut()
.push(end_child.into_element().into_any());
self
}
pub fn end_children(mut self, end_children: impl IntoIterator<Item = impl IntoElement>) -> Self
where
Self: Sized,
{
self.end_children_mut().extend(
end_children
.into_iter()
.map(|child| child.into_any_element()),
);
self
}
}
impl ParentElement for TabBar {
fn extend(&mut self, elements: impl IntoIterator<Item = AnyElement>) {
self.children.extend(elements)
}
}
impl RenderOnce for TabBar {
fn render(self, _: &mut Window, cx: &mut App) -> impl IntoElement {
let style = self.style;
let tabs_row = h_flex()
.id("tabs")
.flex_grow()
.overflow_x_scroll()
// Underline (VSCode-style) tabs sit flush with per-tab dividers;
// only the Pills style keeps an inter-tab gap.
.when(style == TabBarStyle::Pills, |this| this.gap_2())
.when_some(self.scroll_handle, |this, scroll_handle| {
this.track_scroll(&scroll_handle)
})
.children(self.children);
let middle = match style {
// No `.overflow_x_hidden()` here: the inner `tabs_row` already owns
// its horizontal overflow via `.overflow_x_scroll()`, and an outer
// clip on this `relative` wrapper made the `Tab` children
// non-hit-testable (clicks at their real bounds silently no-op'd).
// No bottom border line (borderless header per the requested
// mockup); the tabs row fills the bar directly.
TabBarStyle::Underline => div()
.relative()
.flex_1()
.h_full()
.child(tabs_row)
.into_any_element(),
TabBarStyle::Pills => div()
.flex_1()
.p_1()
.rounded_lg()
.bg(semantic::elevated_surface(cx))
.child(tabs_row)
.into_any_element(),
};
div()
.id(self.id)
.group("tab_bar")
.flex()
.flex_none()
.w_full()
.h(Tab::container_height(cx))
.bg(semantic::surface(cx))
.when(!self.start_children.is_empty(), |this| {
this.child(
h_flex()
.flex_none()
.gap(DynamicSpacing::Base04.rems(cx))
.px(DynamicSpacing::Base06.rems(cx))
.children(self.start_children),
)
})
.child(middle)
.when(!self.end_children.is_empty(), |this| {
this.child(
h_flex()
.flex_none()
.gap(DynamicSpacing::Base04.rems(cx))
.px(DynamicSpacing::Base06.rems(cx))
.children(self.end_children),
)
})
}
}
impl Component for TabBar {
fn scope() -> ComponentScope {
ComponentScope::Navigation
}
fn name() -> &'static str {
"TabBar"
}
fn description() -> Option<&'static str> {
Some("A horizontal bar containing tabs for navigation between different views or sections.")
}
fn preview(_window: &mut Window, _cx: &mut App) -> Option<AnyElement> {
Some(
v_flex()
.gap_6()
.children(vec![
example_group_with_title(
"Underline (default)",
vec![single_example(
"With Tabs",
TabBar::new("underline_tab_bar")
.child(Tab::new("u_tab1").toggle_state(true).child("Overview"))
.child(Tab::new("u_tab2").child("Activity"))
.child(Tab::new("u_tab3").child("Settings"))
.into_any_element(),
)],
),
example_group_with_title(
"Pills",
vec![single_example(
"With Tabs",
TabBar::new("pills_tab_bar")
.style(TabBarStyle::Pills)
.child(
Tab::new("p_tab1")
.style(TabBarStyle::Pills)
.toggle_state(true)
.child("Overview"),
)
.child(
Tab::new("p_tab2")
.style(TabBarStyle::Pills)
.child("Activity"),
)
.child(
Tab::new("p_tab3")
.style(TabBarStyle::Pills)
.child("Settings"),
)
.into_any_element(),
)],
),
example_group_with_title(
"With Start and End Children",
vec![single_example(
"Full TabBar",
TabBar::new("full_tab_bar")
.start_child(Button::new("start_button", "Start"))
.child(Tab::new("tab1"))
.child(Tab::new("tab2"))
.child(Tab::new("tab3"))
.end_child(Button::new("end_button", "End"))
.into_any_element(),
)],
),
])
.into_any_element(),
)
}
}