122 lines
3.5 KiB
Rust
122 lines
3.5 KiB
Rust
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#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
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use std::{
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ops::{Deref, DerefMut},
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sync::Arc,
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};
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use eframe::{
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egui::{self, Slider},
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egui_wgpu,
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epaint::{
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mutex::{Mutex, RwLock},
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Rect, Vec2,
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},
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CreationContext,
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};
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use egui_glyphon::{
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glyphon::{Attrs, Family, FontSystem, Metrics, Shaping},
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BufferWithTextArea, GlyphonRenderer, GlyphonRendererCallback,
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};
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fn main() -> Result<(), eframe::Error> {
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env_logger::init(); // Log to stderr (if you run with `RUST_LOG=debug`).
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let options = eframe::NativeOptions {
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viewport: egui::ViewportBuilder::default().with_inner_size([320.0, 240.0]),
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..Default::default()
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};
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eframe::run_native(
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"My egui App",
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options,
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Box::new(|cc| Box::new(MyApp::new(cc))),
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)
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}
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struct Buffer(egui_glyphon::glyphon::Buffer);
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impl AsRef<egui_glyphon::glyphon::Buffer> for Buffer {
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fn as_ref(&self) -> &egui_glyphon::glyphon::Buffer {
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&self.0
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}
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}
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impl Deref for Buffer {
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type Target = egui_glyphon::glyphon::Buffer;
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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impl DerefMut for Buffer {
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fn deref_mut(&mut self) -> &mut Self::Target {
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&mut self.0
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}
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}
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struct MyApp {
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font_system: Arc<Mutex<FontSystem>>,
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size: f32,
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buffer: Arc<RwLock<Buffer>>,
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}
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impl Default for MyApp {
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fn default() -> Self {
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let mut font_system = FontSystem::new();
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let mut buffer = Buffer(egui_glyphon::glyphon::Buffer::new(
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&mut font_system,
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Metrics::new(30.0, 42.0),
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));
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buffer.set_size(&mut font_system, 16.0, 9.0);
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buffer.set_text(&mut font_system, "<== Hello world! ==> 👋\nThis is rendered with 🦅 glyphon 🦁\nThe text below should be partially clipped.\na b c d e f g h i j k l m n o p q r s t u v w x y z", Attrs::new().family(Family::SansSerif), Shaping::Advanced);
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buffer.shape_until_scroll(&mut font_system);
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Self {
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font_system: Arc::new(Mutex::new(font_system)),
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buffer: Arc::new(RwLock::new(buffer)),
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size: 35.0,
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}
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}
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}
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impl MyApp {
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fn new(cc: &CreationContext<'_>) -> Self {
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let app = Self::default();
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if let Some(ref wgpu) = cc.wgpu_render_state {
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GlyphonRenderer::insert(wgpu, Arc::clone(&app.font_system));
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}
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app
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}
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}
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impl eframe::App for MyApp {
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fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
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let size = Vec2::new(16.0 * self.size, 9.0 * self.size);
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{
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let mut font_system = self.font_system.lock();
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let mut buffer = self.buffer.write();
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buffer.set_metrics(&mut font_system, Metrics::new(self.size, self.size));
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buffer.set_size(&mut font_system, size.x, size.y);
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buffer.shape_until_scroll(&mut font_system);
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}
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egui::CentralPanel::default().show(ctx, |ui| {
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ui.add(Slider::new(&mut self.size, 0.1..=67.5));
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let rect = Rect::from_min_size(ui.cursor().min, size);
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let buffers: Vec<BufferWithTextArea<Buffer>> = vec![BufferWithTextArea::new(
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Arc::clone(&self.buffer),
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rect,
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1.0,
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egui_glyphon::glyphon::Color::rgb(255, 255, 255),
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ui.ctx(),
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)];
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ui.painter().add(egui_wgpu::Callback::new_paint_callback(
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ui.max_rect(),
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GlyphonRendererCallback { buffers },
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));
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});
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}
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}
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