add tabs
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@@ -0,0 +1,299 @@
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use std::rc::Rc;
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use gpui::prelude::FluentBuilder as _;
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use gpui::{
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AnyElement, App, ElementId, Hsla, InteractiveElement as _, IntoElement, KeyDownEvent,
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ParentElement as _, Pixels, RenderOnce, Role, SharedString, StatefulInteractiveElement as _,
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Styled as _, Window, div,
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};
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use gpui_native_icons::{IconRole, icon};
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use gpui_native_theme::ActiveTheme as _;
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/// The change reporter, fired with the next selected tab by pointer and keys.
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type ChangeHandler = Rc<dyn Fn(usize, &mut Window, &mut App)>;
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type TabsFn = Box<dyn Fn(&mut Window, &mut App) -> Vec<Tab>>;
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/// One tab of a [`Tabs`] strip.
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pub struct Tab {
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label: SharedString,
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icon: Option<IconRole>,
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disabled: bool,
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}
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impl Tab {
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/// Creates a tab with this label.
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pub fn new<L>(label: L) -> Self
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where
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L: Into<SharedString>,
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{
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Self {
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label: label.into(),
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icon: None,
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disabled: false,
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}
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}
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/// Shows an icon leading the label.
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pub fn icon(mut self, role: IconRole) -> Self {
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self.icon = Some(role);
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self
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}
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/// Renders the tab dimmed; clicks and keyboard skip it.
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pub fn disabled(mut self, disabled: bool) -> Self {
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self.disabled = disabled;
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self
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}
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}
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/// A tab strip.
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#[derive(IntoElement)]
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pub struct Tabs {
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id: ElementId,
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selected: usize,
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a11y_label: Option<SharedString>,
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on_change: Option<ChangeHandler>,
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tabs: Option<TabsFn>,
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}
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impl Tabs {
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/// Creates a strip selecting the first tab.
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pub fn new<I>(id: I) -> Self
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where
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I: Into<ElementId>,
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{
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Self {
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id: id.into(),
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selected: 0,
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a11y_label: None,
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on_change: None,
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tabs: None,
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}
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}
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/// Sets the current selection.
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pub fn selected(mut self, selected: usize) -> Self {
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self.selected = selected;
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self
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}
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/// Reports the next selected tab, from clicks and keys alike.
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pub fn on_change<F>(mut self, handler: F) -> Self
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where
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F: Fn(usize, &mut Window, &mut App) + 'static,
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{
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self.on_change = Some(Rc::new(handler));
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self
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}
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/// Sets the tabs, built fresh each render.
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pub fn tabs<F>(mut self, tabs: F) -> Self
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where
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F: Fn(&mut Window, &mut App) -> Vec<Tab> + 'static,
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{
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self.tabs = Some(Box::new(tabs));
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self
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}
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/// Overrides the accessibility label, which defaults to the id.
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pub fn accessibility_label<L>(mut self, label: L) -> Self
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where
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L: Into<SharedString>,
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{
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self.a11y_label = Some(label.into());
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self
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}
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}
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struct TabsChrome {
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foreground: Hsla,
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muted: Hsla,
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muted_foreground: Hsla,
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primary: Hsla,
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border: Hsla,
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radius_sm: Pixels,
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icon_size: Pixels,
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text_size: Pixels,
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/// The strip's selected index; re-selecting it reports nothing.
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selected: usize,
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}
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impl RenderOnce for Tabs {
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fn render(self, window: &mut Window, cx: &mut App) -> impl IntoElement {
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let chrome = {
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let theme = cx.theme();
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TabsChrome {
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foreground: theme.colors.foreground,
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muted: theme.colors.muted,
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muted_foreground: theme.colors.muted_foreground,
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primary: theme.ramps.primary.base,
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border: theme.colors.border,
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radius_sm: theme.radius.sm,
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icon_size: theme.sizes.medium.icon_size,
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text_size: theme.sizes.medium.text_size,
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selected: self.selected,
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}
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};
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let tabs = match self.tabs {
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Some(build) => build(window, cx),
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None => Vec::new(),
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};
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let selectable: Vec<usize> = tabs
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.iter()
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.enumerate()
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.filter(|(_, tab)| !tab.disabled)
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.map(|(index, _)| index)
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.collect();
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// Keyboard focus rides the strip across frames.
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let focus_handle = window.with_element_namespace(self.id.clone(), |window| {
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window.use_keyed_state("tabs-focus", cx, |_, cx| cx.focus_handle())
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});
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let focus = focus_handle.read(cx).clone();
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let label = self
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.a11y_label
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.clone()
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.unwrap_or_else(|| SharedString::from(self.id.to_string()));
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let strip: Vec<AnyElement> = tabs
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.iter()
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.enumerate()
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.map(|(index, tab)| {
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render_tab(
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tab,
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index,
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self.selected == index,
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&chrome,
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&self.on_change,
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&focus,
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)
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})
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.collect();
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div()
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.id(self.id)
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.flex()
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.gap_1()
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.border_b_1()
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.border_color(chrome.border)
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.text_size(chrome.text_size)
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.track_focus(&focus)
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.focusable()
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.tab_stop(true)
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.role(Role::TabList)
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.aria_label(label)
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.on_key_down({
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let selected = self.selected;
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let on_change = self.on_change.clone();
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move |event: &KeyDownEvent, window, cx| {
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let target = match event.keystroke.key.as_str() {
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"right" => adjacent(&selectable, selected, true),
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"left" => adjacent(&selectable, selected, false),
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"home" => selectable.first().copied(),
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"end" => selectable.last().copied(),
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_ => return,
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};
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if let Some(next) = target
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&& next != selected
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&& let Some(on_change) = &on_change
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{
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on_change(next, window, cx);
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}
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cx.stop_propagation();
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}
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})
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.children(strip)
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}
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}
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fn render_tab(
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tab: &Tab,
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index: usize,
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selected: bool,
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chrome: &TabsChrome,
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on_change: &Option<ChangeHandler>,
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focus: &gpui::FocusHandle,
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) -> AnyElement {
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let label_color = if tab.disabled {
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chrome.muted_foreground
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} else if selected {
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chrome.primary
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} else {
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chrome.foreground
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};
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let mut strip_tab = div()
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.id(("tab", index))
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.flex()
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.items_center()
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.gap_1p5()
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.px_2()
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.py_1()
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.rounded_tl(chrome.radius_sm)
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.rounded_tr(chrome.radius_sm)
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.role(Role::Tab)
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.aria_selected(selected)
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.text_color(label_color)
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.when(selected, |strip_tab| {
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// The underline sits on the strip's hairline, marking the active
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// tab the way a native tab bar does.
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strip_tab.border_b_2().border_color(chrome.primary)
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})
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.when(!tab.disabled && !selected, |strip_tab| {
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strip_tab.hover(|strip_tab| strip_tab.bg(chrome.muted))
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})
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.child(
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div()
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.flex_none()
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.pb_0p5()
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.when_some(tab.icon, |strip_tab, role| {
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strip_tab.child(icon(role).size(chrome.icon_size * 0.75).color(label_color))
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}),
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)
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.child(strip_tab_label(tab.label.clone(), selected, chrome));
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if !tab.disabled {
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let selected_index = chrome.selected;
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strip_tab = strip_tab.cursor_pointer().on_click({
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let on_change = on_change.clone();
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let focus = focus.clone();
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move |_, window, cx| {
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window.focus(&focus, cx);
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if index != selected_index
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&& let Some(on_change) = &on_change
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{
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on_change(index, window, cx);
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}
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}
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});
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}
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strip_tab.into_any_element()
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}
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fn strip_tab_label(label: SharedString, selected: bool, chrome: &TabsChrome) -> AnyElement {
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div()
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.text_color(if selected {
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chrome.primary
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} else {
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chrome.foreground
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})
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.child(label)
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.into_any_element()
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}
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/// The next selectable tab in the direction.
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fn adjacent(selectable: &[usize], selected: usize, forward: bool) -> Option<usize> {
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if forward {
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selectable.iter().copied().find(|index| *index > selected)
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} else {
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selectable
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.iter()
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.copied()
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.rev()
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.find(|index| *index < selected)
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}
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}
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