migrations/egui
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egui_web: default to light mode unless prefers-color-scheme: dark

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This commit is contained in:
Emil Ernerfeldt
2021-06-07 20:56:18 +02:00
parent 44b573f6a6
commit 62f58a3b05
8 changed files with 54 additions and 16 deletions
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14
egui_web/src/backend.rs
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@@ -137,6 +137,7 @@ pub struct AppRunner {
app: Box<dyn epi::App>,
pub(crate) needs_repaint: std::sync::Arc<NeedRepaint>,
storage: LocalStorage,
prefer_dark_mode: Option<bool>,
last_save_time: f64,
screen_reader: crate::screen_reader::ScreenReader,
#[cfg(feature = "http")]
@@ -147,14 +148,24 @@ pub struct AppRunner {
impl AppRunner {
pub fn new(web_backend: WebBackend, app: Box<dyn epi::App>) -> Result<Self, JsValue> {
load_memory(&web_backend.egui_ctx);
let storage = LocalStorage::default();
let prefer_dark_mode = crate::prefer_dark_mode();
if prefer_dark_mode == Some(true) {
web_backend.egui_ctx.set_visuals(egui::Visuals::dark());
} else {
web_backend.egui_ctx.set_visuals(egui::Visuals::light());
}
let storage = LocalStorage::default();
let mut runner = Self {
web_backend,
input: Default::default(),
app,
needs_repaint: Default::default(),
storage,
prefer_dark_mode,
last_save_time: now_sec(),
screen_reader: Default::default(),
#[cfg(feature = "http")]
@@ -221,6 +232,7 @@ impl AppRunner {
web_info: Some(epi::WebInfo {
web_location_hash: location_hash().unwrap_or_default(),
}),
prefer_dark_mode: self.prefer_dark_mode,
cpu_usage: self.web_backend.previous_frame_time,
seconds_since_midnight: Some(seconds_since_midnight()),
native_pixels_per_point: Some(native_pixels_per_point()),

9
egui_web/src/lib.rs
View File

@@ -92,6 +92,15 @@ pub fn native_pixels_per_point() -> f32 {
}
}
pub fn prefer_dark_mode() -> Option<bool> {
Some(
web_sys::window()?
.match_media("(prefers-color-scheme: dark)")
.ok()??
.matches(),
)
}
pub fn canvas_element(canvas_id: &str) -> Option<web_sys::HtmlCanvasElement> {
use wasm_bindgen::JsCast;
let document = web_sys::window()?.document()?;