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use crate::ui::color::Color;
#[derive(Default)]
pub struct Animation {
start: (f64, f64),
end: (f64, f64),
start_time: i64,
end_time: i64,
}
#[derive(Default)]
pub struct Cursor {
/// Position, (row, col).
pub pos: Option<(f64, f64)>,
/// Flag for disabling the movement animation.
pub disable_animation: bool,
pub animation: Option<Animation>,
/// Alpha color. Used to make the cursor blink.
pub alpha: f64,
/// The duration of the blink.
pub blink_on: u64,
/// Width of the cursor.
pub cell_percentage: f64,
/// Color of the cursor.
pub color: Color,
}
impl Cursor {
pub fn goto(&mut self, row: f64, col: f64, frame_time: i64) {
// When we get our first cursor_goto, set the position directly.
if self.pos.is_none() {
self.pos = Some((row, col));
}
// If cursor animation is disabled, set the position directly. Otherwise, set the animation
// so that we can animate cursor position change.
if self.disable_animation {
self.pos = Some((row, col));
} else {
let duration = 200;
self.animation = Some(Animation {
start: self.pos.unwrap(),
end: (row, col),
start_time: frame_time,
end_time: frame_time + 1000 * duration,
});
}
}
pub fn tick(&mut self, frame_time: i64) {
self.blink();
self.animate_position(frame_time);
}
fn blink(&mut self) {
// If we dont need to blink, return.
if self.blink_on == 0 {
return;
}
// Assuming a 60hz framerate
self.alpha += 100.0 / (6.0 * self.blink_on as f64);
if self.alpha > 2.0 {
self.alpha = 0.0;
}
}
fn animate_position(&mut self, frame_time: i64) {
if let Some(Animation {
start,
end,
start_time,
end_time,
}) = self.animation
{
let mut pos = self.pos.unwrap_or((0.0, 0.0));
if frame_time < end_time && pos != end {
let mut t = (frame_time - start_time) as f64
/ (end_time - start_time) as f64;
t = ease_out_cubic(t);
pos.0 = start.0 + t * (end.0 - start.0);
pos.1 = start.1 + t * (end.1 - start.1);
self.pos = Some(pos);
} else {
self.pos = Some(end);
self.animation = None;
}
}
}
/// Gets the position of the cursor.
pub fn get_position(&self) -> Option<(f64, f64)> {
if let Some(ref a) = self.animation {
// The end position of our animation is the "real" position where
// the cursor is.
Some(a.end)
} else {
self.pos
}
}
}
/// From clutter-easing.c, based on Robert Penner's
/// infamous easing equations, MIT license.
fn ease_out_cubic(t: f64) -> f64 {
let p = t - 1f64;
p * p * p + 1f64
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_cursor_blink100() {
let mut cursor = Cursor::default();
cursor.blink_on = 100;
cursor.alpha = 1.0;
cursor.blink();
assert_eq!(cursor.alpha, 1.1666666666666667);
}
#[test]
fn test_cursor_blink0() {
let mut cursor = Cursor::default();
cursor.blink_on = 0;
cursor.alpha = 1.0;
cursor.blink();
assert_eq!(cursor.alpha, 1.0);
}
#[test]
fn test_first_position() {
let mut cursor = Cursor::default();
// When we first set the position, it should be set immediately.
cursor.goto(15.0, 15.0, 1);
assert_eq!(cursor.pos, Some((15.0, 15.0)));
// When we've set the position once already, the subsequent goto positions should be set
// with some delay by the animation.
cursor.goto(10.0, 10.0, 1);
assert_eq!(cursor.pos, Some((15.0, 15.0)));
}
#[test]
fn test_animate_position() {
let mut cursor = Cursor::default();
// When we first set the position, it should be set immediately.
cursor.goto(15.0, 15.0, 1);
assert_eq!(cursor.pos, Some((15.0, 15.0)));
cursor.goto(10.0, 10.0, 1);
cursor.tick(25000);
assert_eq!(cursor.pos, Some((13.349666797203126, 13.349666797203126)));
}
#[test]
fn test_animate_position_animation_disabled() {
let mut cursor = Cursor::default();
cursor.disable_animation = true;
// When we first set the position, it should be set immediately.
cursor.goto(15.0, 15.0, 1);
assert_eq!(cursor.pos, Some((15.0, 15.0)));
// Position animation is disabled, goto should change the position directly and tick
// shouldn't affect the position value at all.
cursor.goto(10.0, 10.0, 1);
assert_eq!(cursor.pos, Some((10.0, 10.0)));
cursor.tick(25000);
assert_eq!(cursor.pos, Some((10.0, 10.0)));
}
#[test]
fn test_get_position() {
let mut cursor = Cursor::default();
assert_eq!(cursor.get_position(), None);
cursor.pos = Some((10.0, 10.0));
assert_eq!(cursor.get_position(), Some((10.0, 10.0)));
cursor.animation = Some(Animation {
end: (15.0, 15.0),
..Animation::default()
});
assert_eq!(cursor.get_position(), Some((15.0, 15.0)));
}
}
|
