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use core::ops::{Add, Sub};
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/// Relative offset in 2D space, used for representing translation and
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/// dimensions of objects. Absolute positions on the screen are represented by
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/// the `Point` type.
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#[derive(Copy, Clone, Debug, PartialEq, Eq)]
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pub struct Offset {
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pub x: i32,
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pub y: i32,
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}
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impl Offset {
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pub const fn new(x: i32, y: i32) -> Self {
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Self { x, y }
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}
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pub const fn uniform(a: i32) -> Self {
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Self::new(a, a)
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}
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pub const fn zero() -> Self {
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Self::new(0, 0)
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}
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pub const fn x(x: i32) -> Self {
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Self::new(x, 0)
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}
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pub const fn y(y: i32) -> Self {
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Self::new(0, y)
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}
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pub fn on_axis(axis: Axis, a: i32) -> Self {
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match axis {
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Axis::Horizontal => Self::new(a, 0),
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Axis::Vertical => Self::new(0, a),
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}
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}
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pub fn axis(&self, axis: Axis) -> i32 {
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match axis {
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Axis::Horizontal => self.x,
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Axis::Vertical => self.y,
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}
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}
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pub fn abs(self) -> Self {
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Self::new(self.x.abs(), self.y.abs())
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}
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/// With `self` representing a rectangle size, returns top-left corner of
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/// the rectangle such that it is aligned relative to the `point`.
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pub fn snap(self, point: Point, x: Alignment, y: Alignment) -> Point {
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let x_off = match x {
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Alignment::Start => 0,
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Alignment::Center => self.x / 2,
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Alignment::End => self.x,
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};
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let y_off = match y {
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Alignment::Start => 0,
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Alignment::Center => self.y / 2,
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Alignment::End => self.y,
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};
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point - Self::new(x_off, y_off)
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}
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}
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impl Add<Offset> for Offset {
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type Output = Offset;
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fn add(self, rhs: Offset) -> Self::Output {
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Self::new(self.x + rhs.x, self.y + rhs.y)
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}
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}
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impl Sub<Offset> for Offset {
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type Output = Offset;
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fn sub(self, rhs: Offset) -> Self::Output {
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Self::new(self.x - rhs.x, self.y - rhs.y)
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}
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}
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/// A point in 2D space defined by the the `x` and `y` coordinate. Relative
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/// coordinates, vectors, and offsets are represented by the `Offset` type.
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#[derive(Copy, Clone, PartialEq, Eq)]
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pub struct Point {
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pub x: i32,
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pub y: i32,
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}
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impl Point {
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pub const fn new(x: i32, y: i32) -> Self {
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Self { x, y }
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}
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pub const fn zero() -> Self {
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Self::new(0, 0)
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}
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pub fn center(self, rhs: Self) -> Self {
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Self::new((self.x + rhs.x) / 2, (self.y + rhs.y) / 2)
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}
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}
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impl Add<Offset> for Point {
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type Output = Point;
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fn add(self, rhs: Offset) -> Self::Output {
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Self::new(self.x + rhs.x, self.y + rhs.y)
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}
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}
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impl Sub<Offset> for Point {
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type Output = Point;
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fn sub(self, rhs: Offset) -> Self::Output {
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Self::new(self.x - rhs.x, self.y - rhs.y)
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}
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}
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impl Sub<Point> for Point {
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type Output = Offset;
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fn sub(self, rhs: Point) -> Self::Output {
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Offset::new(self.x - rhs.x, self.y - rhs.y)
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}
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}
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/// A rectangle in 2D space defined by the top-left point `x0`,`y0` and the
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/// bottom-right point `x1`,`y1`.
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#[derive(Copy, Clone, PartialEq, Eq)]
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pub struct Rect {
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pub x0: i32,
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pub y0: i32,
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pub x1: i32,
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pub y1: i32,
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}
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impl Rect {
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pub const fn new(p0: Point, p1: Point) -> Self {
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Self {
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x0: p0.x,
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y0: p0.y,
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x1: p1.x,
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y1: p1.y,
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}
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}
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pub const fn zero() -> Self {
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Self::new(Point::zero(), Point::zero())
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}
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pub const fn from_top_left_and_size(p0: Point, size: Offset) -> Self {
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Self {
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x0: p0.x,
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y0: p0.y,
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x1: p0.x + size.x,
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y1: p0.y + size.y,
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}
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}
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pub fn from_center_and_size(p: Point, size: Offset) -> Self {
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Self {
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x0: p.x - size.x / 2,
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y0: p.y - size.y / 2,
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x1: p.x + size.x / 2,
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y1: p.y + size.y / 2,
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}
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}
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pub fn with_top_left(self, p0: Point) -> Self {
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Self::from_top_left_and_size(p0, self.size())
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}
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pub fn with_size(self, size: Offset) -> Self {
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Self::from_top_left_and_size(self.top_left(), size)
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}
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pub fn with_width(self, width: i32) -> Self {
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self.with_size(Offset::new(width, self.height()))
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}
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pub fn with_height(self, height: i32) -> Self {
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self.with_size(Offset::new(self.width(), height))
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}
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pub fn width(&self) -> i32 {
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self.x1 - self.x0
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}
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pub fn height(&self) -> i32 {
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self.y1 - self.y0
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}
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pub fn size(&self) -> Offset {
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Offset::new(self.width(), self.height())
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}
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pub fn top_left(&self) -> Point {
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Point::new(self.x0, self.y0)
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}
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pub fn top_right(&self) -> Point {
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Point::new(self.x1, self.y0)
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}
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pub fn bottom_left(&self) -> Point {
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Point::new(self.x0, self.y1)
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}
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pub fn bottom_right(&self) -> Point {
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Point::new(self.x1, self.y1)
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}
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pub fn center(&self) -> Point {
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self.top_left().center(self.bottom_right())
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}
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pub fn bottom_center(&self) -> Point {
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self.bottom_left().center(self.bottom_right())
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}
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pub fn contains(&self, point: Point) -> bool {
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point.x >= self.x0 && point.x < self.x1 && point.y >= self.y0 && point.y < self.y1
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}
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pub fn union(&self, other: Self) -> Self {
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Self {
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x0: self.x0.min(other.x0),
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y0: self.y0.min(other.y0),
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x1: self.x1.max(other.x1),
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y1: self.y1.max(other.y1),
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}
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}
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pub const fn inset(&self, insets: Insets) -> Self {
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Self {
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x0: self.x0 + insets.left,
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y0: self.y0 + insets.top,
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x1: self.x1 - insets.right,
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y1: self.y1 - insets.bottom,
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}
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}
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pub fn cut_from_left(&self, width: i32) -> Self {
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Self {
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x0: self.x0,
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y0: self.y0,
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x1: self.x0 + width,
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y1: self.y1,
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}
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}
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pub fn cut_from_right(&self, width: i32) -> Self {
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Self {
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x0: self.x1 - width,
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y0: self.y0,
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x1: self.x1,
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y1: self.y1,
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}
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}
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pub fn split_top(self, height: i32) -> (Self, Self) {
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let height = height.clamp(0, self.height());
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let top = Self {
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y1: self.y0 + height,
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..self
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};
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let bottom = Self {
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y0: self.y0 + height,
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..self
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};
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(top, bottom)
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}
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pub fn split_bottom(self, height: i32) -> (Self, Self) {
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self.split_top(self.height() - height)
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}
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pub fn split_left(self, width: i32) -> (Self, Self) {
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let width = width.clamp(0, self.width());
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let left = Self {
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x1: self.x0 + width,
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..self
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};
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let right = Self {
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x0: self.x0 + width,
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..self
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};
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(left, right)
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}
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pub fn split_right(self, width: i32) -> (Self, Self) {
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self.split_left(self.width() - width)
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}
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pub fn translate(&self, offset: Offset) -> Self {
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Self {
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x0: self.x0 + offset.x,
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y0: self.y0 + offset.y,
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x1: self.x1 + offset.x,
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y1: self.y1 + offset.y,
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}
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}
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}
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#[derive(Copy, Clone, PartialEq, Eq)]
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pub struct Insets {
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pub top: i32,
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pub right: i32,
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pub bottom: i32,
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pub left: i32,
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}
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impl Insets {
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pub const fn new(top: i32, right: i32, bottom: i32, left: i32) -> Self {
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Self {
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top,
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right,
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bottom,
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left,
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}
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}
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pub const fn uniform(d: i32) -> Self {
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Self::new(d, d, d, d)
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}
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pub const fn top(d: i32) -> Self {
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Self::new(d, 0, 0, 0)
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}
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pub const fn right(d: i32) -> Self {
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Self::new(0, d, 0, 0)
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}
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pub const fn bottom(d: i32) -> Self {
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Self::new(0, 0, d, 0)
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}
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pub const fn left(d: i32) -> Self {
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Self::new(0, 0, 0, d)
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}
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}
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#[derive(Copy, Clone, PartialEq, Eq)]
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pub enum Alignment {
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Start,
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Center,
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End,
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}
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#[derive(Copy, Clone, PartialEq, Eq)]
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pub enum Axis {
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Horizontal,
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Vertical,
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}
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impl Axis {
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pub fn main<T>(self, x: T, y: T) -> T {
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match self {
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Axis::Horizontal => x,
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Axis::Vertical => y,
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}
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}
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pub fn cross(self) -> Self {
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match self {
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Axis::Horizontal => Axis::Vertical,
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Axis::Vertical => Axis::Horizontal,
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}
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}
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}
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pub struct Grid {
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/// Number of rows (cells on the y-axis) in the grid.
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pub rows: usize,
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/// Number of columns (cells on the x-axis) in the grid.
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pub cols: usize,
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/// Padding between cells.
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pub spacing: i32,
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/// Total area covered by this grid.
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pub area: Rect,
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}
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impl Grid {
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pub fn new(area: Rect, rows: usize, cols: usize) -> Self {
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Self {
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rows,
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cols,
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spacing: 0,
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area,
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}
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}
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pub fn with_spacing(mut self, spacing: i32) -> Self {
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self.spacing = spacing;
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self
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}
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pub fn row_col(&self, row: usize, col: usize) -> Rect {
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let ncols = self.cols as i32;
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let nrows = self.rows as i32;
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|
let col = (col as i32).min(ncols - 1);
|
|
|
|
let row = (row as i32).min(nrows - 1);
|
|
|
|
|
|
|
|
// Total number of horizontal pixels used for spacing.
|
|
|
|
let spacing_width = self.spacing * (ncols - 1);
|
|
|
|
let spacing_height = self.spacing * (nrows - 1);
|
|
|
|
|
|
|
|
// Divide what is left by number of cells to obtain width of each cell.
|
|
|
|
let cell_width = (self.area.width() - spacing_width) / ncols;
|
|
|
|
let cell_height = (self.area.height() - spacing_height) / nrows;
|
|
|
|
|
|
|
|
// Not every area can be fully covered by equal-sized cells and spaces, there
|
|
|
|
// might be serveral pixels left unused. We'll distribute them by 1px to
|
|
|
|
// the leftmost cells.
|
|
|
|
let leftover_width = (self.area.width() - spacing_width) % ncols;
|
|
|
|
let leftover_height = (self.area.height() - spacing_height) % nrows;
|
|
|
|
|
|
|
|
let mut top_left = self.area.top_left()
|
|
|
|
+ Offset::new(
|
|
|
|
col * (cell_width + self.spacing),
|
|
|
|
row * (cell_height + self.spacing),
|
|
|
|
);
|
|
|
|
// Some previous cells were 1px wider.
|
|
|
|
top_left.x += leftover_width.min(col);
|
|
|
|
top_left.y += leftover_height.min(row);
|
|
|
|
|
|
|
|
let mut size = Offset::new(cell_width, cell_height);
|
|
|
|
// This cell might be 1px wider.
|
|
|
|
if col < leftover_width {
|
|
|
|
size.x += 1
|
|
|
|
}
|
|
|
|
if row < leftover_height {
|
|
|
|
size.y += 1
|
|
|
|
}
|
|
|
|
|
|
|
|
Rect::from_top_left_and_size(top_left, size)
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn cell(&self, index: usize) -> Rect {
|
|
|
|
self.row_col(index / self.cols, index % self.cols)
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn cells(&self, cells: GridCellSpan) -> Rect {
|
|
|
|
let from = self.row_col(cells.from.0, cells.from.1);
|
|
|
|
let to = self.row_col(cells.to.0, cells.to.1);
|
|
|
|
from.union(to)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
#[derive(Copy, Clone)]
|
|
|
|
pub struct GridCellSpan {
|
|
|
|
pub from: (usize, usize),
|
|
|
|
pub to: (usize, usize),
|
|
|
|
}
|
|
|
|
|
|
|
|
#[derive(Copy, Clone)]
|
|
|
|
pub struct LinearPlacement {
|
|
|
|
pub axis: Axis,
|
|
|
|
pub align: Alignment,
|
|
|
|
pub spacing: i32,
|
|
|
|
}
|
|
|
|
|
|
|
|
impl LinearPlacement {
|
|
|
|
pub fn horizontal() -> Self {
|
|
|
|
Self {
|
|
|
|
axis: Axis::Horizontal,
|
|
|
|
align: Alignment::Start,
|
|
|
|
spacing: 0,
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn vertical() -> Self {
|
|
|
|
Self {
|
|
|
|
axis: Axis::Vertical,
|
|
|
|
align: Alignment::Start,
|
|
|
|
spacing: 0,
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn align_at_start(mut self) -> Self {
|
|
|
|
self.align = Alignment::Start;
|
|
|
|
self
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn align_at_center(mut self) -> Self {
|
|
|
|
self.align = Alignment::Center;
|
|
|
|
self
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn align_at_end(mut self) -> Self {
|
|
|
|
self.align = Alignment::End;
|
|
|
|
self
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn with_spacing(mut self, spacing: i32) -> Self {
|
|
|
|
self.spacing = spacing;
|
|
|
|
self
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Arranges all `items` by parameters configured in `self` into `area`.
|
|
|
|
/// Does not change the size of the items (only the position).
|
|
|
|
pub fn arrange(&self, area: Rect, items: &mut [impl Dimensions]) {
|
|
|
|
let size_sum: i32 = items
|
|
|
|
.iter_mut()
|
|
|
|
.map(|i| i.area().size().axis(self.axis))
|
|
|
|
.sum();
|
|
|
|
let (mut cursor, spacing) = self.compute_spacing(area, items.len(), size_sum);
|
|
|
|
|
|
|
|
for item in items {
|
|
|
|
let item_origin = area.top_left() + Offset::on_axis(self.axis, cursor);
|
|
|
|
let item_area = item.area().with_top_left(item_origin);
|
|
|
|
item.fit(item_area);
|
|
|
|
cursor += item_area.size().axis(self.axis);
|
|
|
|
cursor += spacing;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Arranges number of items of the same size into `area`. The `sink`
|
|
|
|
/// closure is called `count` times with top left point of each item as
|
|
|
|
/// argument. Items are centered along the cross axis.
|
|
|
|
pub fn arrange_uniform(
|
|
|
|
&self,
|
|
|
|
area: Rect,
|
|
|
|
count: usize,
|
|
|
|
size: Offset,
|
|
|
|
sink: &mut dyn FnMut(Point),
|
|
|
|
) {
|
|
|
|
let item_size = size.axis(self.axis);
|
|
|
|
let (mut cursor, spacing) = self.compute_spacing(area, count, (count as i32) * item_size);
|
|
|
|
let cross_coord =
|
|
|
|
area.size().axis(self.axis.cross()) / 2 - size.axis(self.axis.cross()) / 2;
|
|
|
|
|
|
|
|
for _ in 0..count {
|
|
|
|
let top_left = area.top_left()
|
|
|
|
+ Offset::on_axis(self.axis, cursor)
|
|
|
|
+ Offset::on_axis(self.axis.cross(), cross_coord);
|
|
|
|
sink(top_left);
|
|
|
|
cursor += item_size;
|
|
|
|
cursor += spacing;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
fn compute_spacing(&self, area: Rect, count: usize, size_sum: i32) -> (i32, i32) {
|
|
|
|
let spacing_count = count.saturating_sub(1);
|
|
|
|
let spacing_sum = spacing_count as i32 * self.spacing;
|
|
|
|
let naive_size = size_sum + spacing_sum;
|
|
|
|
let available_space = area.size().axis(self.axis);
|
|
|
|
|
|
|
|
// scale down spacing to fit everything into area
|
|
|
|
let (total_size, spacing) = if naive_size > available_space {
|
|
|
|
let scaled_space = (available_space - size_sum) / spacing_count.max(1) as i32;
|
|
|
|
// forbid negative spacing
|
|
|
|
(available_space, scaled_space.max(0))
|
|
|
|
} else {
|
|
|
|
(naive_size, self.spacing)
|
|
|
|
};
|
|
|
|
|
|
|
|
let initial_cursor = match self.align {
|
|
|
|
Alignment::Start => 0,
|
|
|
|
Alignment::Center => available_space / 2 - total_size / 2,
|
|
|
|
Alignment::End => available_space - total_size,
|
|
|
|
};
|
|
|
|
|
|
|
|
(initial_cursor, spacing)
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Types that can place themselves within area specified by `bounds`.
|
|
|
|
pub trait Dimensions {
|
|
|
|
fn fit(&mut self, bounds: Rect);
|
|
|
|
fn area(&self) -> Rect;
|
|
|
|
}
|