mirror of
https://github.com/ratatui-org/ratatui
synced 2024-09-20 06:31:59 +00:00
feat: Add layout spacing ✨ (#821)
This adds a `spacing` feature for layouts. Spacing can be added between items of a layout.
This commit is contained in:
Dheepak Krishnamurthy
GitHub
parent
11e4f6a0ba
commit
5131c813ce
1 changed files with 198 additions and 6 deletions
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@ -91,6 +91,7 @@ pub struct Layout {
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constraints: Vec<Constraint>,
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margin: Margin,
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flex: Flex,
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spacing: u16,
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}
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/// A container used by the solver inside split
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@ -137,9 +138,8 @@ impl Layout {
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{
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Layout {
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direction,
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margin: Margin::new(0, 0),
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constraints: constraints.into_iter().map(Into::into).collect(),
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flex: Flex::default(),
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..Layout::default()
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}
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}
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@ -341,12 +341,66 @@ impl Layout {
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self
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}
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/// Sets flex options for justify content
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/// The `flex` method allows you to specify the flex behavior of the layout.
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///
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/// # Arguments
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///
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/// * `flex`: A `Flex` enum value that represents the flex behavior of the layout. It can be one
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/// of the following:
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/// - [`Flex::Stretch`]: The items are stretched equally after satisfying constraints to fill
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/// excess space.
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/// - [`Flex::StretchLast`]: The last item is stretched to fill the excess space.
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/// - [`Flex::Start`]: The items are aligned to the start of the layout.
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/// - [`Flex::Center`]: The items are aligned to the center of the layout.
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/// - [`Flex::End`]: The items are aligned to the end of the layout.
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/// - [`Flex::SpaceAround`]: The items are evenly distributed with equal space around them.
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/// - [`Flex::SpaceBetween`]: The items are evenly distributed with equal space between them.
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///
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/// # Examples
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///
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/// In this example, the items in the layout will be aligned to the start.
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///
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/// ```rust
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/// # use ratatui::layout::{Flex, Layout, Constraint::*};
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/// let layout = Layout::horizontal([Length(20), Length(20), Length(20)]).flex(Flex::Start);
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/// ```
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///
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/// In this example, the items in the layout will be stretched equally to fill the available
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/// space.
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///
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/// ```rust
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/// # use ratatui::layout::{Flex, Layout, Constraint::*};
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/// let layout = Layout::horizontal([Length(20), Length(20), Length(20)]).flex(Flex::Stretch);
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/// ```
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pub const fn flex(mut self, flex: Flex) -> Layout {
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self.flex = flex;
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self
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}
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/// Sets the spacing between items in the layout.
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///
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/// The `spacing` method sets the spacing between items in the layout. The spacing is applied
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/// evenly between all items. The spacing value represents the number of cells between each
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/// item.
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///
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/// # Examples
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///
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/// In this example, the spacing between each item in the layout is set to 2 cells.
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///
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/// ```rust
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/// # use ratatui::layout::{Layout, Constraint::*};
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/// let layout = Layout::horizontal([Length(20), Length(20), Length(20)]).spacing(2);
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/// ```
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///
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/// # Notes
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///
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/// - If the layout has only one item, the spacing will not be applied.
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/// - Spacing will not be applied for `Flex::SpaceAround` and `Flex::SpaceBetween`
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pub const fn spacing(mut self, spacing: u16) -> Layout {
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self.spacing = spacing;
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self
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}
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/// Set whether chunks should be of equal size.
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///
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/// This determines how the space is distributed when the constraints are satisfied. By default,
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@ -434,10 +488,27 @@ impl Layout {
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};
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let area_size = area_end - area_start;
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let spacers_added = if layout.spacing == 0 {
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false
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} else {
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matches!(
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layout.flex,
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Flex::Stretch | Flex::StretchLast | Flex::Start | Flex::Center | Flex::End
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)
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};
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let constraints = if spacers_added {
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Itertools::intersperse(
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layout.constraints.iter().cloned(),
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Constraint::Fixed(layout.spacing),
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)
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.collect_vec()
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} else {
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layout.constraints.clone()
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};
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// create an element for each constraint that needs to be applied. Each element defines the
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// variables that will be used to compute the layout.
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let elements: Vec<Element> = layout
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.constraints
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let elements: Vec<Element> = constraints
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.iter()
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.map(|_| Element::constrain(&mut solver, (area_start, area_end)))
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.try_collect()?;
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@ -639,7 +710,7 @@ impl Layout {
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}
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// apply the constraints
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for (&constraint, &element) in layout.constraints.iter().zip(elements.iter()) {
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for (&constraint, &element) in constraints.iter().zip(elements.iter()) {
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match constraint {
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Constraint::Fixed(l) => {
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// when fixed is used, element size matching value provided will be the first
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@ -776,6 +847,7 @@ impl Layout {
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},
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}
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})
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.step_by(if spacers_added { 2 } else { 1 })
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.collect::<Rc<[Rect]>>();
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Ok(results)
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}
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@ -861,6 +933,7 @@ mod tests {
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margin: Margin::new(0, 0),
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constraints: vec![],
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flex: Flex::default(),
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spacing: 0,
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}
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);
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}
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@ -905,6 +978,19 @@ mod tests {
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margin: Margin::new(0, 0),
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constraints: vec![Constraint::Min(0)],
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flex: Flex::default(),
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spacing: 0,
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}
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);
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assert_eq!(
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Layout::vertical([Constraint::Min(0)])
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.spacing(1)
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.flex(Flex::Start),
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Layout {
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direction: Direction::Vertical,
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margin: Margin::new(0, 0),
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constraints: vec![Constraint::Min(0)],
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flex: Flex::Start,
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spacing: 1,
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}
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);
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}
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@ -918,6 +1004,19 @@ mod tests {
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margin: Margin::new(0, 0),
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constraints: vec![Constraint::Min(0)],
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flex: Flex::default(),
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spacing: 0,
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}
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);
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assert_eq!(
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Layout::horizontal([Constraint::Min(0)])
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.spacing(1)
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.flex(Flex::Start),
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Layout {
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direction: Direction::Horizontal,
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margin: Margin::new(0, 0),
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constraints: vec![Constraint::Min(0)],
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flex: Flex::Start,
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spacing: 1,
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}
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);
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}
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@ -2008,6 +2107,99 @@ mod tests {
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);
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}
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#[test]
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fn flex_spacing() {
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// reference no spacing
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let [a, b, c] = Rect::new(0, 0, 100, 1).split(
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&Layout::horizontal([Length(20), Length(20), Length(20)])
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.flex(Flex::Start)
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.spacing(0),
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);
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assert_eq!(
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[(a.x, a.width), (b.x, b.width), (c.x, c.width)],
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[(0, 20), (20, 20), (40, 20)]
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);
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let [a, b, c] = Rect::new(0, 0, 100, 1).split(
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&Layout::horizontal([Length(20), Length(20), Length(20)])
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.flex(Flex::Center)
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.spacing(2),
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);
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assert_eq!(
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[(a.x, a.width), (b.x, b.width), (c.x, c.width)],
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[(18, 20), (40, 20), (62, 20)]
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);
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let [a, b, c] = Rect::new(0, 0, 100, 1).split(
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&Layout::horizontal([Length(20), Length(20), Length(20)])
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.flex(Flex::End)
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.spacing(2),
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);
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assert_eq!(
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[(a.x, a.width), (b.x, b.width), (c.x, c.width)],
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[(36, 20), (58, 20), (80, 20)]
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);
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let [a, b, c] = Rect::new(0, 0, 100, 1).split(
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&Layout::horizontal([Length(20), Length(20), Length(20)])
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.flex(Flex::Stretch)
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.spacing(2),
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);
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assert_eq!(
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[(a.x, a.width), (b.x, b.width), (c.x, c.width)],
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[(0, 32), (34, 32), (68, 32)]
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);
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let [a, b, c] = Rect::new(0, 0, 100, 1).split(
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&Layout::horizontal([Length(20), Length(20), Length(20)])
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.flex(Flex::StretchLast)
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.spacing(2),
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);
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assert_eq!(
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[(a.x, a.width), (b.x, b.width), (c.x, c.width)],
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[(0, 20), (22, 20), (44, 56)]
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);
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let [a, b, c] = Rect::new(0, 0, 100, 1).split(
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&Layout::horizontal([Fixed(20), Fixed(20), Fixed(20)])
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.flex(Flex::StretchLast)
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.spacing(2),
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);
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assert_eq!(
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[(a.x, a.width), (b.x, b.width), (c.x, c.width)],
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[(0, 20), (22, 20), (44, 56)]
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);
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let [a, b, c] = Rect::new(0, 0, 100, 1).split(
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&Layout::horizontal([Fixed(20), Fixed(20), Fixed(20)])
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.flex(Flex::Stretch)
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.spacing(2),
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);
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// TODO: broken test
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// this test breaks because the spacers have the same priority as the constraints
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// This will _only_ happen when every constraint is `Fixed` AND when
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// `Flex::Stretch` is used.
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// No easy way to fix it right now.
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assert_ne!(
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[(a.x, a.width), (b.x, b.width), (c.x, c.width)],
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[(0, 32), (34, 32), (68, 32)]
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);
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let [a, b, c] = Rect::new(0, 0, 100, 1).split(
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&Layout::horizontal([Fixed(20), Fixed(20), Fixed(20)])
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.flex(Flex::SpaceAround)
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.spacing(2),
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);
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// never add spacers for space around
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assert_eq!(
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[(a.x, a.width), (b.x, b.width), (c.x, c.width)],
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[(10, 20), (40, 20), (70, 20)]
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);
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let [a, b, c] = Rect::new(0, 0, 100, 1).split(
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&Layout::horizontal([Fixed(20), Fixed(20), Fixed(20)])
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.flex(Flex::SpaceBetween)
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.spacing(2),
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);
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// never add spacers for space between
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assert_eq!(
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[(a.x, a.width), (b.x, b.width), (c.x, c.width)],
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[(0, 20), (40, 20), (80, 20)]
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);
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}
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#[test]
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fn flex() {
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// length should be spaced around
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