use egui::TexturesDelta;
use crate::{epi, App};
use super::{now_sec, web_painter::WebPainter, NeedRepaint};
pub struct AppRunner {
web_options: crate::WebOptions,
pub(crate) frame: epi::Frame,
egui_ctx: egui::Context,
painter: super::ActiveWebPainter,
pub(crate) input: super::WebInput,
app: Box<dyn epi::App>,
pub(crate) needs_repaint: std::sync::Arc<NeedRepaint>,
last_save_time: f64,
pub(crate) ime: Option<egui::output::IMEOutput>,
pub(crate) mutable_text_under_cursor: bool,
textures_delta: TexturesDelta,
clipped_primitives: Option<Vec<egui::ClippedPrimitive>>,
}
impl Drop for AppRunner {
fn drop(&mut self) {
log::debug!("AppRunner has fully dropped");
}
}
impl AppRunner {
pub async fn new(
canvas_id: &str,
web_options: crate::WebOptions,
app_creator: epi::AppCreator,
) -> Result<Self, String> {
let painter = super::ActiveWebPainter::new(canvas_id, &web_options).await?;
let system_theme = if web_options.follow_system_theme {
super::system_theme()
} else {
None
};
let info = epi::IntegrationInfo {
web_info: epi::WebInfo {
user_agent: super::user_agent().unwrap_or_default(),
location: super::web_location(),
},
system_theme,
cpu_usage: None,
};
let storage = LocalStorage::default();
let egui_ctx = egui::Context::default();
egui_ctx.set_os(egui::os::OperatingSystem::from_user_agent(
&super::user_agent().unwrap_or_default(),
));
super::storage::load_memory(&egui_ctx);
egui_ctx.options_mut(|o| {
o.zoom_with_keyboard = false;
o.zoom_factor = 1.0;
});
let theme = system_theme.unwrap_or(web_options.default_theme);
egui_ctx.set_visuals(theme.egui_visuals());
let app = app_creator(&epi::CreationContext {
egui_ctx: egui_ctx.clone(),
integration_info: info.clone(),
storage: Some(&storage),
#[cfg(feature = "glow")]
gl: Some(painter.gl().clone()),
#[cfg(feature = "glow")]
get_proc_address: None,
#[cfg(all(feature = "wgpu", not(feature = "glow")))]
wgpu_render_state: painter.render_state(),
#[cfg(all(feature = "wgpu", feature = "glow"))]
wgpu_render_state: None,
});
let frame = epi::Frame {
info,
storage: Some(Box::new(storage)),
#[cfg(feature = "glow")]
gl: Some(painter.gl().clone()),
#[cfg(all(feature = "wgpu", not(feature = "glow")))]
wgpu_render_state: painter.render_state(),
#[cfg(all(feature = "wgpu", feature = "glow"))]
wgpu_render_state: None,
};
let needs_repaint: std::sync::Arc<NeedRepaint> = Default::default();
{
let needs_repaint = needs_repaint.clone();
egui_ctx.set_request_repaint_callback(move |info| {
needs_repaint.repaint_after(info.delay.as_secs_f64());
});
}
let mut runner = Self {
web_options,
frame,
egui_ctx,
painter,
input: Default::default(),
app,
needs_repaint,
last_save_time: now_sec(),
ime: None,
mutable_text_under_cursor: false,
textures_delta: Default::default(),
clipped_primitives: None,
};
runner.input.raw.max_texture_side = Some(runner.painter.max_texture_side());
runner
.input
.raw
.viewports
.entry(egui::ViewportId::ROOT)
.or_default()
.native_pixels_per_point = Some(super::native_pixels_per_point());
Ok(runner)
}
pub fn egui_ctx(&self) -> &egui::Context {
&self.egui_ctx
}
pub fn app_mut<ConcreteApp: 'static + App>(&mut self) -> &mut ConcreteApp {
self.app
.as_any_mut()
.expect("Your app must implement `as_any_mut`, but it doesn't")
.downcast_mut::<ConcreteApp>()
.expect("app_mut got the wrong type of App")
}
pub fn auto_save_if_needed(&mut self) {
let time_since_last_save = now_sec() - self.last_save_time;
if time_since_last_save > self.app.auto_save_interval().as_secs_f64() {
self.save();
}
}
pub fn save(&mut self) {
if self.app.persist_egui_memory() {
super::storage::save_memory(&self.egui_ctx);
}
if let Some(storage) = self.frame.storage_mut() {
self.app.save(storage);
}
self.last_save_time = now_sec();
}
pub fn canvas(&self) -> &web_sys::HtmlCanvasElement {
self.painter.canvas()
}
pub fn destroy(mut self) {
log::debug!("Destroying AppRunner");
self.painter.destroy();
}
pub fn has_outstanding_paint_data(&self) -> bool {
self.clipped_primitives.is_some()
}
pub fn logic(&mut self) {
super::resize_canvas_to_screen_size(self.canvas(), self.web_options.max_size_points);
let canvas_size = super::canvas_size_in_points(self.canvas(), self.egui_ctx());
let raw_input = self.input.new_frame(canvas_size);
let full_output = self.egui_ctx.run(raw_input, |egui_ctx| {
self.app.update(egui_ctx, &mut self.frame);
});
let egui::FullOutput {
platform_output,
textures_delta,
shapes,
pixels_per_point,
viewport_output,
} = full_output;
if viewport_output.len() > 1 {
log::warn!("Multiple viewports not yet supported on the web");
}
for viewport_output in viewport_output.values() {
for command in &viewport_output.commands {
log::warn!(
"Unhandled egui viewport command: {command:?} - not implemented in web backend"
);
}
}
self.handle_platform_output(platform_output);
self.textures_delta.append(textures_delta);
self.clipped_primitives = Some(self.egui_ctx.tessellate(shapes, pixels_per_point));
}
pub fn paint(&mut self) {
let textures_delta = std::mem::take(&mut self.textures_delta);
let clipped_primitives = std::mem::take(&mut self.clipped_primitives);
if let Some(clipped_primitives) = clipped_primitives {
if let Err(err) = self.painter.paint_and_update_textures(
self.app.clear_color(&self.egui_ctx.style().visuals),
&clipped_primitives,
self.egui_ctx.pixels_per_point(),
&textures_delta,
) {
log::error!("Failed to paint: {}", super::string_from_js_value(&err));
}
}
}
pub fn report_frame_time(&mut self, cpu_usage_seconds: f32) {
self.frame.info.cpu_usage = Some(cpu_usage_seconds);
}
fn handle_platform_output(&mut self, platform_output: egui::PlatformOutput) {
#[cfg(feature = "web_screen_reader")]
if self.egui_ctx.options(|o| o.screen_reader) {
super::screen_reader::speak(&platform_output.events_description());
}
let egui::PlatformOutput {
cursor_icon,
open_url,
copied_text,
events: _, mutable_text_under_cursor,
ime,
#[cfg(feature = "accesskit")]
accesskit_update: _, } = platform_output;
super::set_cursor_icon(cursor_icon);
if let Some(open) = open_url {
super::open_url(&open.url, open.new_tab);
}
#[cfg(web_sys_unstable_apis)]
if !copied_text.is_empty() {
super::set_clipboard_text(&copied_text);
}
#[cfg(not(web_sys_unstable_apis))]
let _ = copied_text;
self.mutable_text_under_cursor = mutable_text_under_cursor;
if self.ime != ime {
super::text_agent::move_text_cursor(ime, self.canvas());
self.ime = ime;
}
}
}
#[derive(Default)]
struct LocalStorage {}
impl epi::Storage for LocalStorage {
fn get_string(&self, key: &str) -> Option<String> {
super::storage::local_storage_get(key)
}
fn set_string(&mut self, key: &str, value: String) {
super::storage::local_storage_set(key, &value);
}
fn flush(&mut self) {}
}