use crate::{
math::{vec2, Rect, Vec2},
ui::{ElementState, Id, Layout, Ui, UiContent},
};
pub struct Tabbar<'a, 'b> {
id: Id,
size: Vec2,
selected_tab: Option<&'b mut u32>,
tabs: &'a [&'a str],
}
impl<'a, 'b> Tabbar<'a, 'b> {
pub fn new(id: Id, size: Vec2, tabs: &'a [&'a str]) -> Tabbar<'a, 'b> {
Tabbar {
id,
size,
tabs,
selected_tab: None,
}
}
pub fn selected_tab<'c>(self, selected_tab: Option<&'c mut u32>) -> Tabbar<'a, 'c> {
Tabbar {
id: self.id,
selected_tab,
size: self.size,
tabs: self.tabs,
}
}
pub fn ui(mut self, ui: &mut Ui) -> u32 {
let context = ui.get_active_window_context();
let pos = context.window.cursor.fit(self.size, Layout::Vertical);
let width = self.size.x as f32 / self.tabs.len() as f32;
let selected = *self
.selected_tab
.as_deref()
.unwrap_or_else(|| context.storage_u32.entry(self.id).or_insert(0));
for (n, label) in self.tabs.iter().enumerate() {
let rect = Rect::new(
pos.x + width * n as f32 + 1.,
pos.y,
width - 2.,
self.size.y,
);
let hovered = rect.contains(context.input.mouse_position);
let selected = n as u32 == selected;
if context.focused && hovered && context.input.click_up {
let id = self.id;
let selected_mut = self
.selected_tab
.as_deref_mut()
.unwrap_or_else(|| context.storage_u32.entry(id).or_insert(0));
*selected_mut = n as u32;
}
context.window.painter.draw_element_background(
&context.style.tabbar_style,
rect.point(),
rect.size(),
ElementState {
focused: context.focused,
hovered,
clicked: hovered && context.input.is_mouse_down,
selected,
},
);
context.window.painter.draw_element_content(
&context.style.tabbar_style,
pos + vec2(width * n as f32, 0.0),
vec2(width, self.size.y),
&UiContent::Label((*label).into()),
ElementState {
focused: context.focused,
hovered,
clicked: hovered && context.input.is_mouse_down,
selected,
},
);
}
*self
.selected_tab
.as_deref()
.unwrap_or_else(|| context.storage_u32.entry(self.id).or_insert(0))
}
}
impl Ui {
pub fn tabbar<'a>(&mut self, id: Id, size: Vec2, tabs: &'a [&'a str]) -> u32 {
Tabbar::new(id, size, tabs).ui(self)
}
}