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Improve `ComboBox` doc example (#7116) 

Improves the `ComboBox` example with some code that shows how to handle
changes in the `ComboBox`’s selection. The approach is based on the
advice given in https://github.com/emilk/egui/discussions/923 . I hope
this saves future me (and hopefully others) a web search for how to do
this.

* [x] I have followed the instructions in the PR template
This commit is contained in:
Rinde van Lon 2025-06-11 11:01:34 +01:00 committed by GitHub
parent bdbe655852
commit cfb10a04f5
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1 changed files with 6 additions and 1 deletions
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7
crates/egui/src/containers/combo_box.rs
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@ -16,9 +16,10 @@ pub type IconPainter = Box<dyn FnOnce(&Ui, Rect, &WidgetVisuals, bool)>;
/// ///
/// ``` /// ```
/// # egui::__run_test_ui(|ui| { /// # egui::__run_test_ui(|ui| {
/// # #[derive(Debug, PartialEq)] /// # #[derive(Debug, PartialEq, Copy, Clone)]
/// # enum Enum { First, Second, Third } /// # enum Enum { First, Second, Third }
/// # let mut selected = Enum::First; /// # let mut selected = Enum::First;
/// let before = selected;
/// egui::ComboBox::from_label("Select one!") /// egui::ComboBox::from_label("Select one!")
/// .selected_text(format!("{:?}", selected)) /// .selected_text(format!("{:?}", selected))
/// .show_ui(ui, |ui| { /// .show_ui(ui, |ui| {
@ -27,6 +28,10 @@ pub type IconPainter = Box<dyn FnOnce(&Ui, Rect, &WidgetVisuals, bool)>;
/// ui.selectable_value(&mut selected, Enum::Third, "Third"); /// ui.selectable_value(&mut selected, Enum::Third, "Third");
/// } /// }
/// ); /// );
///
/// if selected != before {
/// // Handle selection change
/// }
/// # }); /// # });
/// ``` /// ```
#[must_use = "You should call .show*"] #[must_use = "You should call .show*"]