303 lines
9.6 KiB
Rust
303 lines
9.6 KiB
Rust
use egui::TexturesDelta;
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use crate::{epi, App};
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use super::{now_sec, text_agent::TextAgent, web_painter::WebPainter, NeedRepaint};
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pub struct AppRunner {
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#[allow(dead_code)]
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web_options: crate::WebOptions,
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pub(crate) frame: epi::Frame,
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egui_ctx: egui::Context,
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painter: super::ActiveWebPainter,
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pub(crate) input: super::WebInput,
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app: Box<dyn epi::App>,
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pub(crate) needs_repaint: std::sync::Arc<NeedRepaint>,
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last_save_time: f64,
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pub(crate) text_agent: TextAgent,
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// Output for the last run:
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textures_delta: TexturesDelta,
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clipped_primitives: Option<Vec<egui::ClippedPrimitive>>,
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}
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impl Drop for AppRunner {
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fn drop(&mut self) {
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log::debug!("AppRunner has fully dropped");
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}
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}
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impl AppRunner {
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/// # Errors
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/// Failure to initialize WebGL renderer, or failure to create app.
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pub async fn new(
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canvas_id: &str,
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web_options: crate::WebOptions,
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app_creator: epi::AppCreator,
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text_agent: TextAgent,
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) -> Result<Self, String> {
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let painter = super::ActiveWebPainter::new(canvas_id, &web_options).await?;
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let system_theme = if web_options.follow_system_theme {
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super::system_theme()
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} else {
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None
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};
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let info = epi::IntegrationInfo {
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web_info: epi::WebInfo {
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user_agent: super::user_agent().unwrap_or_default(),
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location: super::web_location(),
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},
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system_theme,
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cpu_usage: None,
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};
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let storage = LocalStorage::default();
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let egui_ctx = egui::Context::default();
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egui_ctx.set_os(egui::os::OperatingSystem::from_user_agent(
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&super::user_agent().unwrap_or_default(),
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));
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super::storage::load_memory(&egui_ctx);
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egui_ctx.options_mut(|o| {
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// On web by default egui follows the zoom factor of the browser,
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// and lets the browser handle the zoom shortscuts.
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// A user can still zoom egui separately by calling [`egui::Context::set_zoom_factor`].
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o.zoom_with_keyboard = false;
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o.zoom_factor = 1.0;
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});
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let theme = system_theme.unwrap_or(web_options.default_theme);
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egui_ctx.set_visuals(theme.egui_visuals());
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let cc = epi::CreationContext {
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egui_ctx: egui_ctx.clone(),
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integration_info: info.clone(),
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storage: Some(&storage),
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#[cfg(feature = "glow")]
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gl: Some(painter.gl().clone()),
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#[cfg(feature = "glow")]
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get_proc_address: None,
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#[cfg(all(feature = "wgpu", not(feature = "glow")))]
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wgpu_render_state: painter.render_state(),
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#[cfg(all(feature = "wgpu", feature = "glow"))]
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wgpu_render_state: None,
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};
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let app = app_creator(&cc).map_err(|err| err.to_string())?;
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let frame = epi::Frame {
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info,
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storage: Some(Box::new(storage)),
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#[cfg(feature = "glow")]
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gl: Some(painter.gl().clone()),
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#[cfg(all(feature = "wgpu", not(feature = "glow")))]
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wgpu_render_state: painter.render_state(),
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#[cfg(all(feature = "wgpu", feature = "glow"))]
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wgpu_render_state: None,
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};
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let needs_repaint: std::sync::Arc<NeedRepaint> = Default::default();
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{
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let needs_repaint = needs_repaint.clone();
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egui_ctx.set_request_repaint_callback(move |info| {
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needs_repaint.repaint_after(info.delay.as_secs_f64());
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});
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}
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let mut runner = Self {
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web_options,
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frame,
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egui_ctx,
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painter,
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input: Default::default(),
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app,
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needs_repaint,
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last_save_time: now_sec(),
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text_agent,
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textures_delta: Default::default(),
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clipped_primitives: None,
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};
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runner.input.raw.max_texture_side = Some(runner.painter.max_texture_side());
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runner
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.input
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.raw
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.viewports
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.entry(egui::ViewportId::ROOT)
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.or_default()
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.native_pixels_per_point = Some(super::native_pixels_per_point());
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Ok(runner)
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}
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pub fn egui_ctx(&self) -> &egui::Context {
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&self.egui_ctx
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}
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/// Get mutable access to the concrete [`App`] we enclose.
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///
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/// This will panic if your app does not implement [`App::as_any_mut`].
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pub fn app_mut<ConcreteApp: 'static + App>(&mut self) -> &mut ConcreteApp {
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self.app
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.as_any_mut()
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.expect("Your app must implement `as_any_mut`, but it doesn't")
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.downcast_mut::<ConcreteApp>()
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.expect("app_mut got the wrong type of App")
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}
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pub fn auto_save_if_needed(&mut self) {
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let time_since_last_save = now_sec() - self.last_save_time;
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if time_since_last_save > self.app.auto_save_interval().as_secs_f64() {
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self.save();
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}
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}
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pub fn save(&mut self) {
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if self.app.persist_egui_memory() {
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super::storage::save_memory(&self.egui_ctx);
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}
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if let Some(storage) = self.frame.storage_mut() {
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self.app.save(storage);
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}
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self.last_save_time = now_sec();
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}
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pub fn canvas(&self) -> &web_sys::HtmlCanvasElement {
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self.painter.canvas()
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}
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pub fn destroy(mut self) {
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log::debug!("Destroying AppRunner");
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self.painter.destroy();
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}
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pub fn has_outstanding_paint_data(&self) -> bool {
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self.clipped_primitives.is_some()
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}
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/// Runs the logic, but doesn't paint the result.
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///
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/// The result can be painted later with a call to [`Self::run_and_paint`] or [`Self::paint`].
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pub fn logic(&mut self) {
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// We sometimes miss blur/focus events due to the text agent, so let's just poll each frame:
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self.input
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.set_focus(super::has_focus(self.canvas()) || self.text_agent.has_focus());
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let canvas_size = super::canvas_size_in_points(self.canvas(), self.egui_ctx());
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let mut raw_input = self.input.new_frame(canvas_size);
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self.app.raw_input_hook(&self.egui_ctx, &mut raw_input);
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let full_output = self.egui_ctx.run(raw_input, |egui_ctx| {
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self.app.update(egui_ctx, &mut self.frame);
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});
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let egui::FullOutput {
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platform_output,
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textures_delta,
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shapes,
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pixels_per_point,
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viewport_output,
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} = full_output;
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if viewport_output.len() > 1 {
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log::warn!("Multiple viewports not yet supported on the web");
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}
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for viewport_output in viewport_output.values() {
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for command in &viewport_output.commands {
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// TODO(emilk): handle some of the commands
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log::warn!(
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"Unhandled egui viewport command: {command:?} - not implemented in web backend"
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);
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}
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}
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self.handle_platform_output(platform_output);
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self.textures_delta.append(textures_delta);
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self.clipped_primitives = Some(self.egui_ctx.tessellate(shapes, pixels_per_point));
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}
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/// Paint the results of the last call to [`Self::logic`].
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pub fn paint(&mut self) {
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let textures_delta = std::mem::take(&mut self.textures_delta);
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let clipped_primitives = std::mem::take(&mut self.clipped_primitives);
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if let Some(clipped_primitives) = clipped_primitives {
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if let Err(err) = self.painter.paint_and_update_textures(
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self.app.clear_color(&self.egui_ctx.style().visuals),
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&clipped_primitives,
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self.egui_ctx.pixels_per_point(),
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&textures_delta,
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) {
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log::error!("Failed to paint: {}", super::string_from_js_value(&err));
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}
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}
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}
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pub fn report_frame_time(&mut self, cpu_usage_seconds: f32) {
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self.frame.info.cpu_usage = Some(cpu_usage_seconds);
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}
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fn handle_platform_output(&mut self, platform_output: egui::PlatformOutput) {
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#[cfg(feature = "web_screen_reader")]
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if self.egui_ctx.options(|o| o.screen_reader) {
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super::screen_reader::speak(&platform_output.events_description());
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}
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let egui::PlatformOutput {
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cursor_icon,
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open_url,
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copied_text,
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events: _, // already handled
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mutable_text_under_cursor,
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ime,
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#[cfg(feature = "accesskit")]
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accesskit_update: _, // not currently implemented
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} = platform_output;
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super::set_cursor_icon(cursor_icon);
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if let Some(open) = open_url {
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super::open_url(&open.url, open.new_tab);
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}
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#[cfg(web_sys_unstable_apis)]
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if !copied_text.is_empty() {
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super::set_clipboard_text(&copied_text);
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}
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#[cfg(not(web_sys_unstable_apis))]
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let _ = copied_text;
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self.text_agent.set_focus(mutable_text_under_cursor);
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if let Err(err) = self.text_agent.move_to(ime, self.canvas()) {
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log::error!(
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"failed to update text agent position: {}",
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super::string_from_js_value(&err)
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);
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}
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}
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}
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// ----------------------------------------------------------------------------
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#[derive(Default)]
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struct LocalStorage {}
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impl epi::Storage for LocalStorage {
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fn get_string(&self, key: &str) -> Option<String> {
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super::storage::local_storage_get(key)
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}
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fn set_string(&mut self, key: &str, value: String) {
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super::storage::local_storage_set(key, &value);
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}
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fn flush(&mut self) {}
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}
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