egui_probe/
boolean.rs

1use egui::StrokeKind;
2
3use crate::{BooleanStyle, EguiProbe, Style, option_probe_with};
4
5pub struct ToggleSwitch<'a, T>(pub &'a mut T);
6
7impl EguiProbe for bool {
8    #[inline(always)]
9    fn probe(&mut self, ui: &mut egui::Ui, style: &Style) -> egui::Response {
10        match style.boolean {
11            BooleanStyle::Checkbox => ui.add(egui::Checkbox::without_text(self)),
12            BooleanStyle::ToggleSwitch => toggle_switch(self, ui),
13        }
14    }
15}
16
17impl EguiProbe for ToggleSwitch<'_, bool> {
18    #[inline(always)]
19    fn probe(&mut self, ui: &mut egui::Ui, _style: &Style) -> egui::Response {
20        toggle_switch(self.0, ui)
21    }
22}
23
24impl EguiProbe for ToggleSwitch<'_, Option<bool>> {
25    #[inline(always)]
26    fn probe(&mut self, ui: &mut egui::Ui, style: &Style) -> egui::Response {
27        option_probe_with(
28            self.0,
29            ui,
30            style,
31            || false,
32            |value, ui, _style| toggle_switch(value, ui),
33        )
34    }
35}
36
37/// Shows a toggle switch.
38/// <https://github.com/emilk/egui/blob/master/crates/egui_demo_lib/src/demo/toggle_switch.rs>
39pub fn toggle_switch(on: &mut bool, ui: &mut egui::Ui) -> egui::Response {
40    let desired_size = ui.spacing().interact_size.y * egui::vec2(2.0, 1.0);
41    let (rect, mut response) = ui.allocate_exact_size(desired_size, egui::Sense::click());
42    if response.clicked() {
43        *on = !*on;
44        response.mark_changed();
45    }
46    response.widget_info(|| egui::WidgetInfo::selected(egui::WidgetType::Checkbox, true, *on, ""));
47
48    if ui.is_rect_visible(rect) {
49        let how_on = ui.ctx().animate_bool(response.id, *on);
50        let visuals = ui.style().interact_selectable(&response, *on);
51        let rect = rect.expand(visuals.expansion);
52        let radius = 0.5 * rect.height();
53        ui.painter().rect(
54            rect,
55            radius,
56            visuals.bg_fill,
57            visuals.bg_stroke,
58            StrokeKind::Inside,
59        );
60        let circle_x = egui::lerp((rect.left() + radius)..=(rect.right() - radius), how_on);
61        let center = egui::pos2(circle_x, rect.center().y);
62        ui.painter()
63            .circle(center, 0.75 * radius, visuals.bg_fill, visuals.fg_stroke);
64    }
65
66    response
67}
egui_probe/boolean.rs

egui_probe/
boolean.rs
