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egui_web: Scroll faster when scrolling with mouse wheel

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Closes https://github.com/emilk/egui/issues/159
This commit is contained in:
Emil Ernerfeldt 2021-04-24 11:01:44 +02:00
parent 0f112db550
commit b69bc2c06a
2 changed files with 16 additions and 2 deletions
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3
egui_web/CHANGELOG.md
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@ -5,6 +5,9 @@ All notable changes to the `egui_web` integration will be noted in this file.
## Unreleased
### Fixed ⭐
* Scroll faster when scrolling with mouse wheel.
## 0.11.0 - 2021-04-05

15
egui_web/src/lib.rs
View file

@ -957,8 +957,19 @@ fn install_canvas_events(runner_ref: &AppRunnerRef) -> Result<(), JsValue> {
let runner_ref = runner_ref.clone();
let closure = Closure::wrap(Box::new(move |event: web_sys::WheelEvent| {
let mut runner_lock = runner_ref.0.lock();
runner_lock.input.raw.scroll_delta.x -= event.delta_x() as f32;
runner_lock.input.raw.scroll_delta.y -= event.delta_y() as f32;
let scroll_multiplier = match event.delta_mode() {
web_sys::WheelEvent::DOM_DELTA_PAGE => {
canvas_size_in_points(runner_ref.0.lock().canvas_id()).y
}
web_sys::WheelEvent::DOM_DELTA_LINE => {
24.0 // TODO: tweak this
}
_ => 1.0,
};
runner_lock.input.raw.scroll_delta.x -= scroll_multiplier * event.delta_x() as f32;
runner_lock.input.raw.scroll_delta.y -= scroll_multiplier * event.delta_y() as f32;
runner_lock.needs_repaint.set_true();
event.stop_propagation();
event.prevent_default();