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Add raw mouse wheel event (#2782)

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* Add raw mouse wheel event

The event is sent as it comes from the backend, so it will follow
different conventions depending on the target, and it is up to the user
code to deal with that. The goal is to allow advanced users to implement
alternative UI controls, e.g., using Ctrl to scroll the plot
horizontally instead of zooming, or use Shift to scroll faster instead
of changing direction.

* Change Pixel to Point for consistency

Apply suggestions from code review by emilk

Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>

* Inline mouse wheel raw event closure

It was meant only to be able to use the same variable names without
shadowing the rest of the code, but a simple block accomplishes the same
thing.

* Use wildcard on wheel event match

Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>

* Flip mouse wheel delta sign on web to match native

* Use wheel event data to generate scroll event

To avoid doing the same match and sign conversion twice.

---------

Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>
This commit is contained in:
YgorSouza
2023-04-18 15:44:26 +02:00
committed by GitHub
parent 89e42884fc
commit 8326fffdb0
3 changed files with 71 additions and 8 deletions
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20
crates/egui-winit/src/lib.rs
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@@ -548,6 +548,26 @@ impl State {
}
fn on_mouse_wheel(&mut self, delta: winit::event::MouseScrollDelta) {
{
let (unit, delta) = match delta {
winit::event::MouseScrollDelta::LineDelta(x, y) => {
(egui::MouseWheelUnit::Line, egui::vec2(x, y))
}
winit::event::MouseScrollDelta::PixelDelta(winit::dpi::PhysicalPosition {
x,
y,
}) => (
egui::MouseWheelUnit::Point,
egui::vec2(x as f32, y as f32) / self.pixels_per_point(),
),
};
let modifiers = self.egui_input.modifiers;
self.egui_input.events.push(egui::Event::MouseWheel {
unit,
delta,
modifiers,
});
}
let delta = match delta {
winit::event::MouseScrollDelta::LineDelta(x, y) => {
let points_per_scroll_line = 50.0; // Scroll speed decided by consensus: https://github.com/emilk/egui/issues/461