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pub enum CursorMove {
Up(usize),
Down(usize),
Left(usize),
Right(usize),
Top,
Bottom,
Begin,
End,
Jump((usize, usize)),
Relative((isize, isize)),
}
#[derive(Default, Debug, Clone)]
pub struct Cursor {
x: isize,
y: isize,
x_max: isize,
y_max: isize,
}
impl Cursor {
pub const fn new() -> Self {
Self {
x: 0,
y: 0,
x_max: 0,
y_max: 0,
}
}
pub const fn with_position(mut self, x: isize, y: isize) -> Self {
self.x = x;
self.y = y;
self
}
pub const fn with_max(mut self, x: isize, y: isize) -> Self {
self.x_max = x;
self.y_max = y;
self
}
pub fn x(&self) -> usize {
self.x as usize
}
pub fn y(&self) -> usize {
self.y as usize
}
pub fn set_x_max(&mut self, max: usize) {
self.x_max = max as isize;
}
pub fn set_y_max(&mut self, max: usize) {
self.y_max = max as isize;
}
pub fn move_checked(&mut self, m: CursorMove) {
self.move_unchecked(m);
self.correct_cursor_position();
}
pub fn move_unchecked(&mut self, m: CursorMove) {
match m {
CursorMove::Up(n) => self.y -= n as isize,
CursorMove::Down(n) => self.y += n as isize,
CursorMove::Left(n) => self.x -= n as isize,
CursorMove::Right(n) => self.x += n as isize,
CursorMove::Top => self.y = 0,
CursorMove::Bottom => self.y = self.y_max,
CursorMove::Begin => self.x = 0,
CursorMove::End => self.x = self.x_max,
CursorMove::Jump((x, y)) => {
self.x = x as isize;
self.y = y as isize;
},
CursorMove::Relative((x, y)) => {
self.x += x;
self.y += y;
}
};
}
pub fn correct_cursor_position(&mut self) {
self.y = self.y.max(0).min(self.y_max);
self.x = self.x.max(0).min(self.x_max);
}
pub fn is_at_start(&self) -> bool {
self.x == 0
}
pub fn is_at_end(&self) -> bool {
self.x == self.x_max
}
pub fn is_at_top(&self) -> bool {
self.y == 0
}
pub fn is_at_bottom(&self) -> bool {
self.y == self.y_max
}
}
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