如何在Bevy的inspector egui中显示Timer的mode属性？

问题根源在于Timer的mode字段类型TimerMode是枚举，而当前bevy-inspector-egui尚未支持通过Reflect自动渲染枚举类型，因此触发Reflect enum inspection is not yet implemented错误。以下是两种可行的解决方式：

方式一：为TimerMode实现自定义检查器 #

直接为TimerMode枚举实现Inspectable trait，让inspector能正确渲染这个枚举选项：

use bevy::prelude::*;
use bevy_inspector_egui::Inspectable;
use egui::ComboBox;

// 为TimerMode实现自定义UI渲染逻辑
impl Inspectable for TimerMode {
    type Attributes = ();

    fn ui(
        &mut self,
        ui: &mut egui::Ui,
        _options: Self::Attributes,
        _context: &mut bevy_inspector_egui::Context,
    ) -> bool {
        let mut changed = false;

        ComboBox::from_label("Mode")
            .selected_text(match self {
                TimerMode::Once => "Once",
                TimerMode::Repeating => "Repeating",
            })
            .show_ui(ui, |ui| {
                if ui.selectable_label(*self == TimerMode::Once, "Once").clicked() {
                    *self = TimerMode::Once;
                    changed = true;
                }
                if ui.selectable_label(*self == TimerMode::Repeating, "Repeating").clicked() {
                    *self = TimerMode::Repeating;
                    changed = true;
                }
            });

        changed
    }
}

方式二：为Timer实现完整自定义检查器 #

如果需要更灵活的Timer界面控制，可以直接为整个Timer类型实现Inspectable，覆盖默认的反射生成UI，同时完整展示所有字段（包括mode）：

use bevy::prelude::*;
use bevy_inspector_egui::Inspectable;
use egui::{ComboBox, DragValue};

impl Inspectable for Timer {
    type Attributes = ();

    fn ui(
        &mut self,
        ui: &mut egui::Ui,
        _options: Self::Attributes,
        _context: &mut bevy_inspector_egui::Context,
    ) -> bool {
        let mut changed = false;

        ui.label("Shooting Timer");
        ui.indent("timer_details", |ui| {
            // 编辑已流逝时间
            if ui.add(DragValue::new(&mut self.elapsed_secs).speed(0.1)).changed() {
                changed = true;
            }
            // 编辑总时长
            if ui.add(DragValue::new(&mut self.duration_secs).speed(0.1)).changed() {
                changed = true;
            }
            // 控制暂停状态
            if ui.checkbox(&mut self.paused, "Paused").changed() {
                changed = true;
            }
            // 选择Timer模式
            ComboBox::from_label("Mode")
                .selected_text(match self.mode {
                    TimerMode::Once => "Once",
                    TimerMode::Repeating => "Repeating",
                })
                .show_ui(ui, |ui| {
                    if ui.selectable_label(self.mode == TimerMode::Once, "Once").clicked() {
                        self.mode = TimerMode::Once;
                        changed = true;
                    }
                    if ui.selectable_label(self.mode == TimerMode::Repeating, "Repeating").clicked() {
                        self.mode = TimerMode::Repeating;
                        changed = true;
                    }
                });
            // 显示完成状态（可选添加点击重置逻辑）
            if ui.label(format!("Finished: {}", self.finished())).clicked() {
                self.reset();
                changed = true;
            }
        });

        changed
    }
}

注意事项 #

• 实现上述代码后，无需修改原Tower组件的定义，inspector会自动使用自定义的检查器渲染Timer字段。
• 若后续bevy-inspector-egui版本支持了反射枚举的自动渲染，可直接移除自定义实现。

内容的提问来源于stack exchange，提问作者Bruhloon