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use std::cmp::Ordering;
use gpui::{AnyElement, ScrollHandle};
use smallvec::SmallVec;
use crate::prelude::*;
use crate::{Tab, TabPosition};
/// 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).
// Bottom border line: painted as an absolute overlay *before*
// `tabs_row` (so it sits underneath), rather than as a
// `border_b_1` on this container, because the active `Tab`
// "cuts through" the line via `pb_px` — that only reads
// correctly if the line is painted under the tabs, not as part
// of this wrapper's own border.
TabBarStyle::Underline => div()
.relative()
.flex_1()
.h_full()
.child(
div()
.absolute()
.top_0()
.left_0()
.size_full()
.border_b_1()
.border_color(cx.theme().colors().border),
)
.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(cx.theme().colors().tab_bar_background)
.when(!self.start_children.is_empty(), |this| {
this.child(
h_flex()
.flex_none()
.gap(DynamicSpacing::Base04.rems(cx))
.px(DynamicSpacing::Base06.rems(cx))
.border_b_1()
.border_r_1()
.border_color(cx.theme().colors().border)
.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))
.border_b_1()
.border_l_1()
.border_color(cx.theme().colors().border)
.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")
.position(TabPosition::First)
.toggle_state(true)
.child("Overview"),
)
.child(
Tab::new("u_tab2")
.position(TabPosition::Middle(Ordering::Greater))
.child("Activity"),
)
.child(
Tab::new("u_tab3")
.position(TabPosition::Last)
.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(),
)
}
}