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separator.rs
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separator.rs
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use crate::*;
/// A visual separator. A horizontal or vertical line (depending on [`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 an ui with `ui.add(widget);`"]
pub struct Separator {
spacing: f32,
is_horizontal_line: Option<bool>,
}
impl Default for Separator {
fn default() -> Self {
Self {
spacing: 6.0,
is_horizontal_line: None,
}
}
}
impl Separator {
/// How much space we take up. The line is painted in the middle of this.
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.
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.
pub fn vertical(mut self) -> Self {
self.is_horizontal_line = Some(false);
self
}
}
impl Widget for Separator {
fn ui(self, ui: &mut Ui) -> Response {
let Separator {
spacing,
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 = 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;
if is_horizontal_line {
ui.painter().hline(rect.x_range(), rect.center().y, stroke);
} else {
ui.painter().vline(rect.center().x, rect.y_range(), stroke);
}
}
response
}
}