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|
//! Swipe gesture from scroll events.
//!
//! Tracks when to begin, update, and end a swipe gesture from pointer axis events, also whether
//! the gesture is vertical or horizontal. Necessary because libinput only provides touchpad swipe
//! gesture events for 3+ fingers.
#[derive(Debug)]
pub struct ScrollSwipeGesture {
ongoing: bool,
vertical: bool,
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Action {
BeginUpdate,
Update,
End,
}
impl ScrollSwipeGesture {
pub const fn new() -> Self {
Self {
ongoing: false,
vertical: false,
}
}
pub fn update(&mut self, dx: f64, dy: f64) -> Action {
if dx == 0. && dy == 0. {
self.ongoing = false;
Action::End
} else if !self.ongoing {
self.ongoing = true;
self.vertical = dy != 0.;
Action::BeginUpdate
} else {
Action::Update
}
}
pub fn reset(&mut self) -> bool {
if self.ongoing {
self.ongoing = false;
true
} else {
false
}
}
pub fn is_vertical(&self) -> bool {
self.vertical
}
}
impl Default for ScrollSwipeGesture {
fn default() -> Self {
Self::new()
}
}
impl Action {
pub fn begin(self) -> bool {
self == Action::BeginUpdate
}
pub fn end(self) -> bool {
self == Action::End
}
}
|
