egui 教程二 —— 设置字体

前言

上一篇文章中介绍了如何使用egui创建一个应用程序，但还存在问题，app的字体仅支持英文，还不支持中文。而且当时代码都在main方法中没有进行拆分。本文主要解决这两个问题

代码

以下是完整代码。代码中自定义了软件的字体，

#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
#![allow(rustdoc::missing_crate_level_docs)] // it's an example

use eframe::egui;

fn main() -> eframe::Result {
    # 设置基础配置项
    let options = eframe::NativeOptions {
        viewport: egui::ViewportBuilder::default().with_inner_size([320.0, 240.0]),
        ..Default::default()
    };
    # 注意这行代码，在第一篇教程中这个方法是run_simple_native
    eframe::run_native(
        "pic匹克", # 标题设置中文一会儿启动看是否能正常显示
        options,
        Box::new(|cc| Ok(Box::new(PicPicApp::new(cc)))),
    )
}

struct PicPicApp {
    name: String,
    age: u32,
}


impl PicPicApp {
    fn new(cc: &eframe::CreationContext<'_>) -> Self {
        # 设置自定义字体，该方法定义在最下方了
        setup_custom_fonts(&cc.egui_ctx);
        Self {
            name: "Aspirin".to_owned(),
            age: 18,
        }
    }
}

impl eframe::App for PicPicApp {
    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
        egui::CentralPanel::default().show(ctx, |ui| {
            ui.heading("pic匹克");
            ui.horizontal(|ui| {
                let name_label = ui.label("Your name: ");
                ui.text_edit_singleline(&mut self.name)
                    .labelled_by(name_label.id);
            });
            ui.add(egui::Slider::new(&mut self.age, 0..=120).text("age"));
            if ui.button("Increment").clicked() {
                self.age += 1;
            }
            ui.label(format!("Hello '{}', age {}", self.name, self.age));
        });
    }
}

# 自定义字体的方法
fn setup_custom_fonts(ctx: &egui::Context) {
    // Start with the default fonts (we will be adding to them rather than replacing them).
    let mut fonts = egui::FontDefinitions::default();

    // Install my own font (maybe supporting non-latin characters).
    // .ttf and .otf files supported.
    fonts.font_data.insert(
        "my_font".to_owned(),
        egui::FontData::from_static(include_bytes!(
            "../fonts/FangZhengFangSongJianTi.ttf"
        )),
    );

    // Put my font first (highest priority) for proportional text:
    fonts
        .families
        .entry(egui::FontFamily::Proportional)
        .or_default()
        .insert(0, "my_font".to_owned());

    // Put my font as last fallback for monospace:
    fonts
        .families
        .entry(egui::FontFamily::Monospace)
        .or_default()
        .push("my_font".to_owned());

    // Tell egui to use these fonts:
    ctx.set_fonts(fonts);
}

程序截图