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use crate::input::{Event, StandardEvent};
#[macro_export]
macro_rules! select {
(default $default: expr, $first: expr) => {
if let Some(value) = $first() {
value
}
else {
$default()
}
};
(default $default: expr, $first: expr, $($arg:expr),*) => {
if let Some(value) = $first() {
value
}
$(else if let Some(value) = $arg() {
value
})*
else {
$default()
}
};
}
#[macro_export]
macro_rules! first {
($first: expr, $($arg:expr),*) => {
if $first().is_some() {
}
$(else if $arg().is_some() {
})*
};
}
/// Utility function to handle scroll events.
#[must_use]
pub(crate) fn handle_view_data_scroll(event: Event, view_state: &crate::view::State) -> Option<Event> {
match event {
Event::Standard(StandardEvent::ScrollLeft) => view_state.scroll_left(),
Event::Standard(StandardEvent::ScrollRight) => view_state.scroll_right(),
Event::Standard(StandardEvent::ScrollDown) => view_state.scroll_down(),
Event::Standard(StandardEvent::ScrollUp) => view_state.scroll_up(),
Event::Standard(StandardEvent::ScrollTop) => view_state.scroll_top(),
Event::Standard(StandardEvent::ScrollBottom) => view_state.scroll_bottom(),
Event::Standard(StandardEvent::ScrollJumpDown) => view_state.scroll_page_down(),
Event::Standard(StandardEvent::ScrollJumpUp) => view_state.scroll_page_up(),
_ => return None,
};
Some(event)
}
#[cfg(test)]
mod tests {
use captur::capture;
use rstest::rstest;
use super::*;
use crate::test_helpers::with_view_state;
#[rstest]
#[case::scroll_left(StandardEvent::ScrollLeft, "ScrollLeft")]
#[case::scroll_right(StandardEvent::ScrollRight, "ScrollRight")]
#[case::scroll_down(StandardEvent::ScrollDown, "ScrollDown")]
#[case::scroll_up(StandardEvent::ScrollUp, "ScrollUp")]
#[case::scroll_top(StandardEvent::ScrollTop, "ScrollTop")]
#[case::scroll_bottom(StandardEvent::ScrollBottom, "ScrollBottom")]
#[case::jump_down(StandardEvent::ScrollJumpDown, "PageDown")]
#[case::jump_up(StandardEvent::ScrollJumpUp, "PageUp")]
fn handle_view_data_scroll_event(#[case] meta_event: StandardEvent, #[case] action: &str) {
with_view_state(|context| {
capture!(action);
let event = Event::from(meta_event);
assert_eq!(handle_view_data_scroll(event, &context.state), Some(event));
context.assert_render_action(&[action]);
});
}
#[test]
fn handle_view_data_scroll_event_other() {
with_view_state(|context| {
let event = Event::from('a');
assert!(handle_view_data_scroll(event, &context.state).is_none());
context.assert_render_action(&[]);
});
}
}
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