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[slider] show full precision of value if value is very precise

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Emil Ernerfeldt 2020-08-28 00:14:57 +02:00
parent fd95f8a146
commit ecb703a696
1 changed files with 14 additions and 4 deletions
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18
egui/src/widgets/slider.rs
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@ -183,12 +183,14 @@ impl<'a> Slider<'a> {
/// Just the text label
fn text_ui(&mut self, ui: &mut Ui, x_range: RangeInclusive<f32>) {
let aim_radius = ui.input().aim_radius();
let text = self.format_text(aim_radius, x_range);
let value_text = self.format_value(aim_radius, x_range);
let label_text = self.text.as_ref().map(String::as_str).unwrap_or_default();
let text = format!("{}: {}", label_text, value_text);
let text_color = self.text_color.unwrap_or_else(|| ui.style().text_color);
ui.add(Label::new(text).multiline(false).text_color(text_color));
}
fn format_text(&mut self, aim_radius: f32, x_range: RangeInclusive<f32>) -> String {
fn format_value(&mut self, aim_radius: f32, x_range: RangeInclusive<f32>) -> String {
let value = (self.get_set_value)(None);
let precision = self.precision.unwrap_or_else(|| {
@ -201,8 +203,16 @@ impl<'a> Slider<'a> {
(-range.log10()).ceil().max(0.0) as usize
});
let text = self.text.as_ref().map(String::as_str).unwrap_or_default();
format!("{}: {:.*}", text, precision, value)
let text = format!("{:.*}", precision, value);
if (text.parse::<f32>().unwrap() - value).abs() <= std::f32::EPSILON {
// Enough precision to show the value accurately - good!
text
} else {
// The value has more precision than we expected.
// Probably the value was set not by the slider, but from outside.
// In any case: show the full value
value.to_string()
}
}
}