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|
use futures::future::Future;
pub fn spawn_local<F: Future<Output = ()> + 'static>(f: F) {
let c = glib::MainContext::default();
c.spawn_local(f);
}
pub fn calc_line_space(space: i64) -> (i32, i32) {
let half = space as f64 / 2.0;
if half as f64 % 2.0 != 0.0 {
(half.ceil() as i32, half.floor() as i32)
} else {
(half as i32, half as i32)
}
}
/// Calculate the preferred width and x-position.
pub fn get_preferred_horizontal_position(
area: &gdk::Rectangle,
pos: &gdk::Rectangle,
mut width: i32,
) -> (i32, i32) {
let mut x = pos.x;
let rigth = x + width;
// If we're overflowing to the right...
if rigth > area.width {
let overflow = rigth - area.width;
// Move our x position to the left, but not father that 0.
x = (x - overflow).max(0);
// And set our width to be either the original width, or truncate
// it to area.width it happens to be smaller (otherwise we'd still
// overflow).
width = width.min(area.width);
}
(x, width)
}
/// Calculate the preferred height and y-position.
pub fn get_preferred_vertical_position(
area: &gdk::Rectangle,
pos: &gdk::Rectangle,
mut height: i32,
) -> (i32, i32) {
let mut y = pos.y - height;
if y < area.y {
let max_above = area.y + pos.y;
let max_below = area.height - (pos.y + pos.height);
if max_above > max_below {
y = area.y;
height = max_above;
} else {
y = pos.y + pos.height;
height = height.min(max_below);
}
}
(y, height)
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn test_calc_line_space() {
assert_eq!((1, 0), calc_line_space(1));
assert_eq!((1, 1), calc_line_space(2));
assert_eq!((3, 2), calc_line_space(5));
}
#[test]
fn test_get_preferred_vertical_position1() {
// Case 1: there is room just fine in the obvious position.
let area = gdk::Rectangle {
x: 0,
y: 0,
width: 300,
height: 300,
};
let pos = gdk::Rectangle {
x: 0,
y: 30,
width: 300,
height: 15,
};
let height = 30;
let (y, h) = get_preferred_vertical_position(&area, &pos, height);
assert_eq!(y, 0);
assert_eq!(h, 30);
}
#[test]
fn test_get_preferred_vertical_position2() {
// Case 2: there is no room above the `pos`, so we should position our
// selves below the pos.
let area = gdk::Rectangle {
x: 0,
y: 0,
width: 300,
height: 300,
};
let pos = gdk::Rectangle {
x: 0,
y: 0,
width: 300,
height: 15,
};
let height = 30;
let (y, h) = get_preferred_vertical_position(&area, &pos, height);
assert_eq!(y, 15);
assert_eq!(h, 30);
}
#[test]
fn test_get_preferred_vertical_position3() {
// Case 3: there is no room above the `pos`, so we should position our
// selves below the pos but in this case, we need to truncate our height too.
let area = gdk::Rectangle {
x: 0,
y: 0,
width: 300,
height: 35,
};
let pos = gdk::Rectangle {
x: 0,
y: 0,
width: 300,
height: 15,
};
let height = 30;
let (y, h) = get_preferred_vertical_position(&area, &pos, height);
assert_eq!(y, 15);
assert_eq!(h, 20);
}
#[test]
fn test_get_preferred_vertical_position4() {
// Case 4: there is no room above the `pos`, but below it there is even less
// space. We should go above, but truncate our height.
let area = gdk::Rectangle {
x: 0,
y: 0,
width: 300,
height: 40,
};
let pos = gdk::Rectangle {
x: 0,
y: 30,
width: 300,
height: 50,
};
let height = 80;
let (y, h) = get_preferred_vertical_position(&area, &pos, height);
assert_eq!(y, 0);
assert_eq!(h, 30);
}
#[test]
fn test_get_preferred_horizontal_position1() {
// Case 1: Everything fits.
let area = gdk::Rectangle {
x: 0,
y: 0,
height: 0,
width: 10,
};
let pos = gdk::Rectangle {
x: 0,
y: 0,
width: 0,
height: 0,
};
let width = 10;
let (x, w) = get_preferred_horizontal_position(&area, &pos, width);
assert_eq!(x, 0);
assert_eq!(w, 10);
}
#[test]
fn test_get_preferred_horizontal_position2() {
// Case 2: Width is trucated.
let area = gdk::Rectangle {
x: 0,
y: 0,
height: 0,
width: 5,
};
let pos = gdk::Rectangle {
x: 0,
y: 0,
width: 0,
height: 0,
};
let width = 10;
let (x, w) = get_preferred_horizontal_position(&area, &pos, width);
assert_eq!(x, 0);
assert_eq!(w, 5);
}
#[test]
fn test_get_preferred_horizontal_position3() {
// Case 3: X is moved to left.
let area = gdk::Rectangle {
x: 0,
y: 0,
height: 0,
width: 20,
};
let pos = gdk::Rectangle {
x: 15,
y: 0,
width: 0,
height: 0,
};
let width = 15;
let (x, w) = get_preferred_horizontal_position(&area, &pos, width);
assert_eq!(x, 5);
assert_eq!(w, 15);
}
#[test]
fn test_get_preferred_horizontal_position4() {
// Case 4: X is moved to left and width is truncated
let area = gdk::Rectangle {
x: 0,
y: 0,
height: 0,
width: 20,
};
let pos = gdk::Rectangle {
x: 15,
y: 0,
width: 0,
height: 0,
};
let width = 150;
let (x, w) = get_preferred_horizontal_position(&area, &pos, width);
assert_eq!(x, 0);
assert_eq!(w, 20);
}
}
|
