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#[derive(Debug, Clone, Copy)]
pub enum ScrollCommand {
Lines(i32),
Pages(i32),
}
impl ScrollCommand {
pub fn to_lines(self, page_height: usize) -> i32 {
match self {
Self::Lines(n) => n,
Self::Pages(n) => n * page_height as i32,
}
}
pub fn is_up(self) -> bool {
match self {
Self::Lines(n) => n < 0,
Self::Pages(n) => n < 0,
}
}
/// compute the new scroll value
pub fn apply(
self,
scroll: usize,
content_height: usize,
page_height: usize,
) -> usize {
(scroll as i32 + self.to_lines(page_height))
.min(content_height as i32 - page_height as i32 + 1)
.max(0) as usize
}
pub fn is_thumb(y: u16, scrollbar: Option<(u16, u16)>) -> bool {
if let Some((sctop, scbottom)) = scrollbar {
if sctop <= y && y <= scbottom {
return true;
}
}
false
}
}
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