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feat: Table column calculation uses layout spacing ✨ (#824)

Browse source 
This uses the new `spacing` feature of the `Layout` struct to allocate
columns spacing in the `Table` widget.
This changes the behavior of the table column layout in the following
ways:

1. Selection width is always allocated.
- if a user does not want a selection width ever they should use
`HighlightSpacing::Never`
2. Column spacing is prioritized over other constraints
- if a user does not want column spacing, they should use
`Table::new(...).column_spacing(0)`

---------

Co-authored-by: Josh McKinney <joshka@users.noreply.github.com>
This commit is contained in:
Dheepak Krishnamurthy 2024-01-16 21:51:25 -05:00 committed by GitHub
parent f299463847
commit 9df6cebb58
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GPG key ID: B5690EEEBB952194
3 changed files with 470 additions and 222 deletions
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648
src/widgets/table/table.rs
View file

@ -1,5 +1,3 @@
use std::iter;
use itertools::Itertools;
use super::*;
@ -373,7 +371,7 @@ impl<'a> Table<'a> {
/// ```rust
/// # use ratatui::{prelude::*, widgets::*};
/// let table = Table::default().widths([Constraint::Length(5), Constraint::Length(5)]);
/// let table = Table::default().widths(&[Constraint::Length(5), Constraint::Length(5)]);
/// let table = Table::default().widths(vec![Constraint::Length(5); 2]);
///
/// // widths could also be computed at runtime
/// let widths = [10, 10, 20].into_iter().map(|c| Constraint::Length(c));
@ -727,30 +725,23 @@ impl Table<'_> {
.map(|r| r.cells.len())
.max()
.unwrap_or(0);
// There are `col_count - 1` spaces between the columns
let total_space =
max_width.saturating_sub(self.column_spacing * col_count.saturating_sub(1) as u16);
// Divide the remaining space between each column equally
vec![Constraint::Length(total_space / col_count.max(1) as u16); col_count]
// Divide the space between each column equally
vec![Constraint::Length(max_width / col_count.max(1) as u16); col_count]
} else {
self.widths.to_vec()
};
let constraints = iter::once(Constraint::Length(selection_width))
.chain(Itertools::intersperse(
widths.iter().cloned(),
Constraint::Length(self.column_spacing),
))
.collect_vec();
// this will always allocate a selection area
let [_selection_area, columns_area] =
Rect::new(0, 0, max_width, 1).split(&Layout::horizontal([
Constraint::Fixed(selection_width),
Constraint::Proportional(0),
]));
#[allow(deprecated)]
let layout = Layout::horizontal(constraints)
let rects = Layout::horizontal(widths)
.segment_size(self.segment_size)
.split(Rect::new(0, 0, max_width, 1));
layout
.iter()
.skip(1) // skip selection column
.step_by(2) // skip spacing between columns
.map(|c| (c.x, c.width))
.collect()
.spacing(self.column_spacing)
.split(columns_area);
rects.iter().map(|c| (c.x, c.width)).collect()
}
fn get_row_bounds(
@ -1201,99 +1192,49 @@ mod tests {
// test how constraints interact with table column width allocation
mod column_widths {
use super::*;
/// Construct a a new table with the given constraints, available and selection widths and
/// tests that the widths match the expected list of (x, width) tuples.
#[track_caller]
fn test(
constraints: &[Constraint],
segment_size: SegmentSize,
available_width: u16,
selection_width: u16,
expected: &[(u16, u16)],
) {
let table = Table::new(Vec::<Row>::new(), constraints).segment_size(segment_size);
let widths = table.get_columns_widths(available_width, selection_width);
assert_eq!(widths, expected);
}
use crate::assert_buffer_eq;
#[test]
fn length_constraint() {
// without selection, more than needed width
test(
&[Length(4), Length(4)],
SegmentSize::None,
20,
0,
&[(0, 4), (5, 4)],
);
let table = Table::default().widths([Length(4), Length(4)]);
assert_eq!(table.get_columns_widths(20, 0), [(0, 4), (5, 4)]);
// with selection, more than needed width
test(
&[Length(4), Length(4)],
SegmentSize::None,
20,
3,
&[(3, 4), (8, 4)],
);
let table = Table::default().widths([Length(4), Length(4)]);
assert_eq!(table.get_columns_widths(20, 3), [(3, 4), (8, 4)]);
// without selection, less than needed width
test(
&[Length(4), Length(4)],
SegmentSize::None,
7,
0,
&[(0, 4), (5, 2)],
);
let table = Table::default().widths([Length(4), Length(4)]);
assert_eq!(table.get_columns_widths(7, 0), [(0, 4), (5, 2)]);
// with selection, less than needed width
test(
&[Length(4), Length(4)],
SegmentSize::None,
7,
3,
&[(3, 4), (7, 0)],
);
// <--------7px-------->
// ┌────────┐x┌────────┐
// │ (3, 3) │x│ (7, 0) │
// └────────┘x└────────┘
// column spacing (i.e. `x`) is always prioritized
let table = Table::default().widths([Length(4), Length(4)]);
assert_eq!(table.get_columns_widths(7, 3), [(3, 3), (7, 0)]);
}
#[test]
fn max_constraint() {
// without selection, more than needed width
test(
&[Max(4), Max(4)],
SegmentSize::None,
20,
0,
&[(0, 4), (5, 4)],
);
let table = Table::default().widths([Max(4), Max(4)]);
assert_eq!(table.get_columns_widths(20, 0), [(0, 4), (5, 4)]);
// with selection, more than needed width
test(
&[Max(4), Max(4)],
SegmentSize::None,
20,
3,
&[(3, 4), (8, 4)],
);
let table = Table::default().widths([Max(4), Max(4)]);
assert_eq!(table.get_columns_widths(20, 3), [(3, 4), (8, 4)]);
// without selection, less than needed width
test(
&[Max(4), Max(4)],
SegmentSize::None,
7,
0,
&[(0, 4), (5, 2)],
);
let table = Table::default().widths([Max(4), Max(4)]);
assert_eq!(table.get_columns_widths(7, 0), [(0, 4), (5, 2)]);
// with selection, less than needed width
test(
&[Max(4), Max(4)],
SegmentSize::None,
7,
3,
&[(3, 3), (7, 0)],
);
let table = Table::default().widths([Max(4), Max(4)]);
assert_eq!(table.get_columns_widths(7, 3), [(3, 3), (7, 0)]);
}
#[test]
@ -1303,152 +1244,91 @@ mod tests {
// constraint and not split it with all available constraints
// without selection, more than needed width
test(
&[Min(4), Min(4)],
SegmentSize::None,
20,
0,
&[(0, 4), (5, 4)],
);
let table = Table::default().widths([Min(4), Min(4)]);
assert_eq!(table.get_columns_widths(20, 0), [(0, 4), (5, 4)]);
// with selection, more than needed width
test(
&[Min(4), Min(4)],
SegmentSize::None,
20,
3,
&[(3, 4), (8, 4)],
);
let table = Table::default().widths([Min(4), Min(4)]);
assert_eq!(table.get_columns_widths(20, 3), [(3, 4), (8, 4)]);
// without selection, less than needed width
// allocates no spacer
test(
&[Min(4), Min(4)],
SegmentSize::None,
7,
0,
&[(0, 4), (4, 3)],
);
// allocates spacer
let table = Table::default().widths([Min(4), Min(4)]);
assert_eq!(table.get_columns_widths(7, 0), [(0, 4), (5, 2)]);
// with selection, less than needed width
// allocates no selection and no spacer
test(
&[Min(4), Min(4)],
SegmentSize::None,
7,
3,
&[(0, 4), (4, 3)],
);
// always allocates selection and spacer
let table = Table::default().widths([Min(4), Min(4)]);
assert_eq!(table.get_columns_widths(7, 3), [(3, 3), (7, 0)]);
}
#[test]
fn percentage_constraint() {
// without selection, more than needed width
test(
&[Percentage(30), Percentage(30)],
SegmentSize::None,
20,
0,
&[(0, 6), (7, 6)],
);
let table = Table::default().widths([Percentage(30), Percentage(30)]);
assert_eq!(table.get_columns_widths(20, 0), [(0, 6), (7, 6)]);
// with selection, more than needed width
test(
&[Percentage(30), Percentage(30)],
SegmentSize::None,
20,
3,
&[(3, 6), (10, 6)],
);
let table = Table::default().widths([Percentage(30), Percentage(30)]);
assert_eq!(table.get_columns_widths(20, 3), [(3, 5), (9, 5)]);
// without selection, less than needed width
// rounds from positions: [0.0, 0.0, 2.1, 3.1, 5.2, 7.0]
test(
&[Percentage(30), Percentage(30)],
SegmentSize::None,
7,
0,
&[(0, 2), (3, 2)],
);
let table = Table::default().widths([Percentage(30), Percentage(30)]);
assert_eq!(table.get_columns_widths(7, 0), [(0, 2), (3, 2)]);
// with selection, less than needed width
// rounds from positions: [0.0, 3.0, 5.1, 6.1, 7.0, 7.0]
test(
&[Percentage(30), Percentage(30)],
SegmentSize::None,
7,
3,
&[(3, 2), (6, 1)],
);
let table = Table::default().widths([Percentage(30), Percentage(30)]);
assert_eq!(table.get_columns_widths(7, 3), [(3, 1), (5, 1)]);
}
#[test]
fn ratio_constraint() {
// without selection, more than needed width
// rounds from positions: [0.00, 0.00, 6.67, 7.67, 14.33]
test(
&[Ratio(1, 3), Ratio(1, 3)],
SegmentSize::None,
20,
0,
&[(0, 7), (8, 6)],
);
let table = Table::default().widths([Ratio(1, 3), Ratio(1, 3)]);
assert_eq!(table.get_columns_widths(20, 0), [(0, 7), (8, 6)]);
// with selection, more than needed width
// rounds from positions: [0.00, 3.00, 10.67, 17.33, 20.00]
test(
&[Ratio(1, 3), Ratio(1, 3)],
SegmentSize::None,
20,
3,
&[(3, 7), (11, 6)],
);
let table = Table::default().widths([Ratio(1, 3), Ratio(1, 3)]);
assert_eq!(table.get_columns_widths(20, 3), [(3, 6), (10, 5)]);
// without selection, less than needed width
// rounds from positions: [0.00, 2.33, 3.33, 5.66, 7.00]
test(
&[Ratio(1, 3), Ratio(1, 3)],
SegmentSize::None,
7,
0,
&[(0, 2), (3, 3)],
);
let table = Table::default().widths([Ratio(1, 3), Ratio(1, 3)]);
assert_eq!(table.get_columns_widths(7, 0), [(0, 2), (3, 3)]);
// with selection, less than needed width
// rounds from positions: [0.00, 3.00, 5.33, 6.33, 7.00, 7.00]
test(
&[Ratio(1, 3), Ratio(1, 3)],
SegmentSize::None,
7,
3,
&[(3, 2), (6, 1)],
);
let table = Table::default().widths([Ratio(1, 3), Ratio(1, 3)]);
assert_eq!(table.get_columns_widths(7, 3), [(3, 1), (5, 2)]);
}
/// When more width is available than requested, the behavior is controlled by segment_size
#[test]
fn underconstrained() {
let widths = [Min(10), Min(10), Min(1)];
test(
&widths[..],
SegmentSize::None,
62,
0,
&[(0, 10), (11, 10), (22, 1)],
let table = Table::default().widths([Min(10), Min(10), Min(1)]);
assert_eq!(
table.get_columns_widths(62, 0),
&[(0, 10), (11, 10), (22, 1)]
);
test(
&widths[..],
SegmentSize::LastTakesRemainder,
62,
0,
&[(0, 10), (11, 10), (22, 40)],
let table = Table::default()
.widths([Min(10), Min(10), Min(1)])
.segment_size(SegmentSize::LastTakesRemainder);
assert_eq!(
table.get_columns_widths(62, 0),
&[(0, 10), (11, 10), (22, 40)]
);
test(
&widths[..],
SegmentSize::EvenDistribution,
62,
0,
&[(0, 20), (21, 20), (42, 20)],
let table = Table::default()
.widths([Min(10), Min(10), Min(1)])
.segment_size(SegmentSize::EvenDistribution);
assert_eq!(
table.get_columns_widths(62, 0),
&[(0, 20), (21, 20), (42, 20)]
);
}
@ -1475,7 +1355,7 @@ mod tests {
.rows(vec![])
.header(Row::new(vec!["f", "g"]))
.column_spacing(0);
assert_eq!(table.get_columns_widths(10, 0), &[(0, 5), (5, 5)])
assert_eq!(table.get_columns_widths(10, 0), [(0, 5), (5, 5)])
}
#[test]
@ -1484,7 +1364,373 @@ mod tests {
.rows(vec![])
.footer(Row::new(vec!["h", "i"]))
.column_spacing(0);
assert_eq!(table.get_columns_widths(10, 0), &[(0, 5), (5, 5)])
assert_eq!(table.get_columns_widths(10, 0), [(0, 5), (5, 5)])
}
fn test_table_with_selection(
highlight_spacing: HighlightSpacing,
columns: u16,
spacing: u16,
selection: Option<usize>,
) -> Buffer {
let table = Table::default()
.rows(vec![Row::new(vec!["ABCDE", "12345"])])
.highlight_spacing(highlight_spacing)
.highlight_symbol(">>>")
.column_spacing(spacing);
let area = Rect::new(0, 0, columns, 3);
let mut buf = Buffer::empty(area);
let mut state = TableState::default().with_selected(selection);
StatefulWidget::render(table, area, &mut buf, &mut state);
buf
}
#[test]
fn excess_area_highlight_symbol_and_column_spacing_allocation() {
// no highlight_symbol rendered ever
assert_buffer_eq!(
test_table_with_selection(
HighlightSpacing::Never,
15, // width
0, // spacing
None, // selection
),
Buffer::with_lines(vec![
"ABCDE 12345 ", /* default layout is Flex::Start but columns length
* constraints are calculated as `max_area / n_columns`,
* i.e. they are distributed amongst available space */
" ", // row 2
" ", // row 3
])
);
let table = Table::default()
.rows(vec![Row::new(vec!["ABCDE", "12345"])])
.widths([5, 5])
.column_spacing(0);
let area = Rect::new(0, 0, 15, 3);
let mut buf = Buffer::empty(area);
Widget::render(table, area, &mut buf);
assert_buffer_eq!(
buf,
Buffer::with_lines(vec![
"ABCDE12345 ", /* As reference, this is what happens when you manually
* specify widths */
" ", // row 2
" ", // row 3
])
);
// no highlight_symbol rendered ever
assert_buffer_eq!(
test_table_with_selection(
HighlightSpacing::Never,
15, // width
0, // spacing
Some(0), // selection
),
Buffer::with_lines(vec![
"ABCDE 12345 ", // row 1
" ", // row 2
" ", // row 3
])
);
// no highlight_symbol rendered because no selection is made
assert_buffer_eq!(
test_table_with_selection(
HighlightSpacing::WhenSelected,
15, // width
0, // spacing
None, // selection
),
Buffer::with_lines(vec![
"ABCDE 12345 ", // row 1
" ", // row 2
" ", // row 3
])
);
// highlight_symbol rendered because selection is made
assert_buffer_eq!(
test_table_with_selection(
HighlightSpacing::WhenSelected,
15, // width
0, // spacing
Some(0), // selection
),
Buffer::with_lines(vec![
">>>ABCDE 12345", // row 1
" ", // row 2
" ", // row 3
])
);
// highlight_symbol always rendered even no selection is made
assert_buffer_eq!(
test_table_with_selection(
HighlightSpacing::Always,
15, // width
0, // spacing
None, // selection
),
Buffer::with_lines(vec![
" ABCDE 12345", // row 1
" ", // row 2
" ", // row 3
])
);
// no highlight_symbol rendered because no selection is made
assert_buffer_eq!(
test_table_with_selection(
HighlightSpacing::Always,
15, // width
0, // spacing
Some(0), // selection
),
Buffer::with_lines(vec![
">>>ABCDE 12345", // row 1
" ", // row 2
" ", // row 3
])
);
}
#[test]
fn insufficient_area_highlight_symbol_and_column_spacing_allocation() {
// column spacing is prioritized over every other constraint
assert_buffer_eq!(
test_table_with_selection(
HighlightSpacing::Never,
10, // width
1, // spacing
None, // selection
),
Buffer::with_lines(vec![
"ABCDE 1234", // spacing is prioritized and column is cut
" ", // row 2
" ", // row 3
])
);
assert_buffer_eq!(
test_table_with_selection(
HighlightSpacing::WhenSelected,
10, // width
1, // spacing
None, // selection
),
Buffer::with_lines(vec![
"ABCDE 1234", // spacing is prioritized and column is cut
" ", // row 2
" ", // row 3
])
);
// this test checks that space for highlight_symbol space is always allocated.
// this test also checks that space for column is allocated.
//
// Space for highlight_symbol is allocated first by splitting horizontal space
// into highlight_symbol area and column area.
// Then in a separate step, column widths are calculated.
// column spacing is prioritized when column widths are calculated and last column here
// ends up with just 1 wide
assert_buffer_eq!(
test_table_with_selection(
HighlightSpacing::Always,
10, // width
1, // spacing
None, // selection
),
Buffer::with_lines(vec![
" ABCDE 1", // highlight_symbol and spacing are prioritized
" ", // row 2
" ", // row 3
])
);
// the following are specification tests
assert_buffer_eq!(
test_table_with_selection(
HighlightSpacing::Always,
9, // width
1, // spacing
None, // selection
),
Buffer::with_lines(vec![
" ABCD 1", // highlight_symbol and spacing are prioritized
" ", // row 2
" ", // row 3
])
);
assert_buffer_eq!(
test_table_with_selection(
HighlightSpacing::Always,
8, // width
1, // spacing
None, // selection
),
Buffer::with_lines(vec![
" ABCD ", // highlight_symbol and spacing are prioritized
" ", // row 2
" ", // row 3
])
);
assert_buffer_eq!(
test_table_with_selection(
HighlightSpacing::Always,
7, // width
1, // spacing
None, // selection
),
Buffer::with_lines(vec![
" ABC ", // highlight_symbol and spacing are prioritized
" ", // row 2
" ", // row 3
])
);
let table = Table::default()
.rows(vec![Row::new(vec!["ABCDE", "12345"])])
.highlight_spacing(HighlightSpacing::Always)
.segment_size(SegmentSize::EvenDistribution)
.highlight_symbol(">>>")
.column_spacing(1);
let area = Rect::new(0, 0, 10, 3);
let mut buf = Buffer::empty(area);
Widget::render(table, area, &mut buf);
// highlight_symbol and spacing are prioritized but columns are evenly distributed
assert_buffer_eq!(
buf,
Buffer::with_lines(vec![" ABC 123", " ", " ",])
);
assert_buffer_eq!(
test_table_with_selection(
HighlightSpacing::Never,
10, // width
1, // spacing
Some(0), // selection
),
Buffer::with_lines(vec![
"ABCDE 1234", // spacing is prioritized
" ",
" ",
])
);
assert_buffer_eq!(
test_table_with_selection(
HighlightSpacing::WhenSelected,
10, // width
1, // spacing
Some(0), // selection
),
Buffer::with_lines(vec![
">>>ABCDE 1", // row 1
" ", // row 2
" ", // row 3
])
);
assert_buffer_eq!(
test_table_with_selection(
HighlightSpacing::Always,
10, // width
1, // spacing
Some(0), // selection
),
Buffer::with_lines(vec![
">>>ABCDE 1", // highlight column and spacing are prioritized
" ", // row 2
" ", // row 3
])
);
}
#[test]
fn insufficient_area_highlight_symbol_allocation_with_no_column_spacing() {
assert_buffer_eq!(
test_table_with_selection(
HighlightSpacing::Never,
10, // width
0, // spacing
None, // selection
),
Buffer::with_lines(vec![
"ABCDE12345", // row 1
" ", // row 2
" ", // row 3
])
);
assert_buffer_eq!(
test_table_with_selection(
HighlightSpacing::WhenSelected,
10, // width
0, // spacing
None, // selection
),
Buffer::with_lines(vec![
"ABCDE12345", // row 1
" ", // row 2
" ", // row 3
])
);
// highlight symbol spacing is prioritized over all constraints
// even if the constraints are fixed length
// this is because highlight_symbol column is separated _before_ any of the constraint
// widths are calculated
assert_buffer_eq!(
test_table_with_selection(
HighlightSpacing::Always,
10, // width
0, // spacing
None, // selection
),
Buffer::with_lines(vec![
" ABCDE12", // highlight column and spacing are prioritized
" ", // row 2
" ", // row 3
])
);
assert_buffer_eq!(
test_table_with_selection(
HighlightSpacing::Never,
10, // width
0, // spacing
Some(0), // selection
),
Buffer::with_lines(vec![
"ABCDE12345", // row 1
" ", // row 2
" ", // row 3
])
);
assert_buffer_eq!(
test_table_with_selection(
HighlightSpacing::WhenSelected,
10, // width
0, // spacing
Some(0), // selection
),
Buffer::with_lines(vec![
">>>ABCDE12", // highlight column and spacing are prioritized
" ", // row 2
" ", // row 3
])
);
assert_buffer_eq!(
test_table_with_selection(
HighlightSpacing::Always,
10, // width
0, // spacing
Some(0), // selection
),
Buffer::with_lines(vec![
">>>ABCDE12", // highlight column and spacing are prioritized
" ", // row 2
" ", // row 3
])
);
}
}

2
tests/state_serde.rs
View file

@ -64,7 +64,7 @@ fn assert_buffer(state: &mut AppState, expected: &Buffer) {
let table = Table::new(
items.iter().map(|i| Row::new(vec![*i])),
[Constraint::Length(10); 5],
[Constraint::Length(10); 1],
)
.highlight_symbol(">>");
f.render_stateful_widget(table, layout[1], &mut state.table_state);

42
tests/widgets_table.rs
View file

@ -399,26 +399,28 @@ fn widgets_table_columns_widths_can_use_mixed_constraints() {
]),
);
// columns of large size (>100% total) hide the last column
test_case(
&[
Constraint::Percentage(60),
Constraint::Length(10),
Constraint::Percentage(60),
],
Buffer::with_lines(vec![
"┌────────────────────────────┐",
"│Head1 Head2 │",
"│ │",
"│Row11 Row12 │",
"│Row21 Row22 │",
"│Row31 Row32 │",
"│Row41 Row42 │",
"│ │",
"│ │",
"└────────────────────────────┘",
]),
);
// This test is unstable and should not be in the test suite
//
// // columns of large size (>100% total) hide the last column
// test_case(
// &[
// Constraint::Percentage(60),
// Constraint::Length(10),
// Constraint::Proportional(60),
// ],
// Buffer::with_lines(vec![
// "┌────────────────────────────┐",
// "│Head1 Head2 │",
// "│ │",
// "│Row11 Row12 │",
// "│Row21 Row22 │",
// "│Row31 Row32 │",
// "│Row41 Row42 │",
// "│ │",
// "│ │",
// "└────────────────────────────┘",
// ]),
// );
}
#[test]