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Follow the System Theme in egui (#4860)

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* Some initial progress towards #4490

This PR just moves `Theme` and the "follow system theme" settings to
egui and adds `RawInput.system_theme`.
A follow-up PR can then introduce the two separate `dark_mode_style` and
`light_mode_style` fields on `Options`.


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### Breaking changes

The options `follow_system_theme` and `default_theme` has been moved
from `eframe` into `egui::Options`, settable with `ctx.options_mut`

---------

Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>
This commit is contained in:
Tau Gärtli
2024-08-06 20:17:51 +02:00
committed by GitHub
parent ed0254288a
commit 2dac4a4fc6
16 changed files with 129 additions and 137 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
crates/eframe/src/web/events.rs
View File

@@ -94,6 +94,7 @@ pub(crate) fn install_event_handlers(runner_ref: &WebRunner) -> Result<(), JsVal
install_wheel(runner_ref, &canvas)?;
install_drag_and_drop(runner_ref, &canvas)?;
install_window_events(runner_ref, &window)?;
install_color_scheme_change_event(runner_ref, &window)?;
Ok(())
}
@@ -353,17 +354,17 @@ fn install_window_events(runner_ref: &WebRunner, window: &EventTarget) -> Result
Ok(())
}
pub(crate) fn install_color_scheme_change_event(runner_ref: &WebRunner) -> Result<(), JsValue> {
let window = web_sys::window().unwrap();
if let Some(media_query_list) = prefers_color_scheme_dark(&window)? {
fn install_color_scheme_change_event(
runner_ref: &WebRunner,
window: &web_sys::Window,
) -> Result<(), JsValue> {
if let Some(media_query_list) = prefers_color_scheme_dark(window)? {
runner_ref.add_event_listener::<web_sys::MediaQueryListEvent>(
&media_query_list,
"change",
|event, runner| {
let theme = theme_from_dark_mode(event.matches());
runner.frame.info.system_theme = Some(theme);
runner.egui_ctx().set_visuals(theme.egui_visuals());
runner.input.raw.system_theme = Some(theme);
runner.needs_repaint.repaint_asap();
},
)?;