egui/emigui/src/containers/frame.rs

//! Frame container

use crate::*;

#[derive(Clone, Debug, Default)]
pub struct Frame {
    pub margin: Option<Vec2>,
}

impl Frame {
    pub fn margin(mut self, margin: Vec2) -> Self {
        self.margin = Some(margin);
        self
    }
}

impl Frame {
    pub fn show(self, ui: &mut Ui, add_contents: impl FnOnce(&mut Ui)) {
        let style = ui.style();
        let margin = self.margin.unwrap_or_default();

        let outer_pos = ui.cursor();
        let inner_rect =
            Rect::from_min_size(outer_pos + margin, ui.available_space() - 2.0 * margin);
        let where_to_put_background = ui.paint_list_len();

        let mut child_ui = ui.child_ui(inner_rect);
        add_contents(&mut child_ui);

        let inner_size = child_ui.bounding_size();
        let inner_size = inner_size.ceil(); // TODO: round to pixel

        let outer_rect = Rect::from_min_size(outer_pos, margin + inner_size + margin);

        let corner_radius = style.window.corner_radius;
        let fill_color = style.background_fill_color();
        ui.insert_paint_cmd(
            where_to_put_background,
            PaintCmd::Rect {
                corner_radius,
                fill_color: Some(fill_color),
                outline: Some(Outline::new(1.0, color::WHITE)),
                rect: outer_rect,
            },
        );

        ui.expand_to_include_child(child_ui.child_bounds().expand2(margin));
        // TODO: move up cursor?
    }
}