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use crate::{Response, Sense, Ui, Vec2, Widget, vec2};
/// A visual separator. A horizontal or vertical line (depending on [`crate::Layout`]).
///
/// Usually you'd use the shorter version [`Ui::separator`].
///
/// ```
/// # egui::__run_test_ui(|ui| {
/// // These are equivalent:
/// ui.separator();
/// ui.add(egui::Separator::default());
/// # });
/// ```
#[must_use = "You should put this widget in a ui with `ui.add(widget);`"]
pub struct Separator {
spacing: f32,
grow: f32,
is_horizontal_line: Option<bool>,
}
impl Default for Separator {
fn default() -> Self {
Self {
spacing: 6.0,
grow: 0.0,
is_horizontal_line: None,
}
}
}
impl Separator {
/// How much space we take up. The line is painted in the middle of this.
///
/// In a vertical layout, with a horizontal Separator,
/// this is the height of the separator widget.
///
/// In a horizontal layout, with a vertical Separator,
/// this is the width of the separator widget.
#[inline]
pub fn spacing(mut self, spacing: f32) -> Self {
self.spacing = spacing;
self
}
/// Explicitly ask for a horizontal line.
///
/// By default you will get a horizontal line in vertical layouts,
/// and a vertical line in horizontal layouts.
#[inline]
pub fn horizontal(mut self) -> Self {
self.is_horizontal_line = Some(true);
self
}
/// Explicitly ask for a vertical line.
///
/// By default you will get a horizontal line in vertical layouts,
/// and a vertical line in horizontal layouts.
#[inline]
pub fn vertical(mut self) -> Self {
self.is_horizontal_line = Some(false);
self
}
/// Extend each end of the separator line by this much.
///
/// The default is to take up the available width/height of the parent.
///
/// This will make the line extend outside the parent ui.
#[inline]
pub fn grow(mut self, extra: f32) -> Self {
self.grow += extra;
self
}
/// Contract each end of the separator line by this much.
///
/// The default is to take up the available width/height of the parent.
///
/// This effectively adds margins to the line.
#[inline]
pub fn shrink(mut self, shrink: f32) -> Self {
self.grow -= shrink;
self
}
}
impl Widget for Separator {
fn ui(self, ui: &mut Ui) -> Response {
let Self {
spacing,
grow,
is_horizontal_line,
} = self;
let is_horizontal_line = is_horizontal_line
.unwrap_or_else(|| ui.is_grid() || !ui.layout().main_dir().is_horizontal());
let available_space = if ui.is_sizing_pass() {
Vec2::ZERO
} else {
ui.available_size_before_wrap()
};
let size = if is_horizontal_line {
vec2(available_space.x, spacing)
} else {
vec2(spacing, available_space.y)
};
let (rect, response) = ui.allocate_at_least(size, Sense::hover());
if ui.is_rect_visible(response.rect) {
let stroke = ui.visuals().widgets.noninteractive.bg_stroke;
let painter = ui.painter();
if is_horizontal_line {
painter.hline(
(rect.left() - grow)..=(rect.right() + grow),
rect.center().y,
stroke,
);
} else {
painter.vline(
rect.center().x,
(rect.top() - grow)..=(rect.bottom() + grow),
stroke,
);
}
}
response
}
}