43 lines
1.1 KiB
Rust
43 lines
1.1 KiB
Rust
use {
|
|
crate::{
|
|
backend::AXIS_120,
|
|
ifs::wl_seat::{
|
|
PX_PER_SCROLL,
|
|
wl_pointer::{PendingScroll, VERTICAL_SCROLL},
|
|
},
|
|
},
|
|
std::cell::Cell,
|
|
};
|
|
|
|
#[derive(Default)]
|
|
pub struct Scroller {
|
|
v120: Cell<i32>,
|
|
px: Cell<f64>,
|
|
}
|
|
|
|
impl Scroller {
|
|
pub fn handle(&self, scroll: &PendingScroll) -> Option<i32> {
|
|
let n = if let Some(d) = scroll.v120[VERTICAL_SCROLL].get() {
|
|
self.px.set(0.0);
|
|
let mut v120 = self.v120.get() + d;
|
|
let discrete = v120 / AXIS_120;
|
|
v120 -= discrete * AXIS_120;
|
|
self.v120.set(v120);
|
|
discrete
|
|
} else if let Some(px) = scroll.px[VERTICAL_SCROLL].get() {
|
|
self.v120.set(0);
|
|
let mut px = self.px.get() + px.to_f64();
|
|
let discrete = (px / PX_PER_SCROLL).trunc();
|
|
px -= discrete * PX_PER_SCROLL;
|
|
self.px.set(px);
|
|
discrete as _
|
|
} else {
|
|
0
|
|
};
|
|
if scroll.stop[VERTICAL_SCROLL].get() {
|
|
self.v120.set(0);
|
|
self.px.set(0.0);
|
|
}
|
|
if n != 0 { Some(n) } else { None }
|
|
}
|
|
}
|