From dcd988e4b8a5710508f95b3b1e1d7ec151be64e3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=9B=B7=E7=94=B5=E8=8A=BD=E8=A1=A3?=
 <zhangyanghaha0407@outlook.com>
Date: Fri, 25 Sep 2026 20:14:58 -0400
Subject: [PATCH] T14a Tables core: DataTable, Table, HeatmapTable, cells,
 Sparkline (review pending: codex 401)

---
 TASKS.md                              |   5 +-
 examples/gallery/pages/mod.rs         |   2 +
 examples/gallery/pages/tables/core.rs | 247 +++++++++++++++
 examples/gallery/pages/tables/mod.rs  |  39 +++
 src/data_display/mod.rs               |   2 +
 src/data_display/spark.rs             | 163 ++++++++++
 src/lib.rs                            |   1 +
 src/lists/mod.rs                      |   1 +
 src/lists/select.rs                   |   4 +-
 src/tables/body.rs                    | 117 ++++++++
 src/tables/cell.rs                    | 228 ++++++++++++++
 src/tables/mod.rs                     |  11 +
 src/tables/model.rs                   | 159 ++++++++++
 src/tables/simple.rs                  | 192 ++++++++++++
 src/tables/table.rs                   | 417 ++++++++++++++++++++++++++
 src/tables/tests.rs                   |  69 +++++
 src/theme/tokens.rs                   |  14 +
 tasks/ch11-20.md                      |  38 ++-
 18 files changed, 1690 insertions(+), 19 deletions(-)
 create mode 100644 examples/gallery/pages/tables/core.rs
 create mode 100644 examples/gallery/pages/tables/mod.rs
 create mode 100644 src/data_display/spark.rs
 create mode 100644 src/tables/body.rs
 create mode 100644 src/tables/cell.rs
 create mode 100644 src/tables/mod.rs
 create mode 100644 src/tables/model.rs
 create mode 100644 src/tables/simple.rs
 create mode 100644 src/tables/table.rs
 create mode 100644 src/tables/tests.rs

diff --git a/TASKS.md b/TASKS.md
index a740555..0686ce6 100644
--- a/TASKS.md
+++ b/TASKS.md
@@ -49,7 +49,9 @@ Per-component lines live in `tasks/`. Tags there:
 - [ ] T13a Lists & Trees · Lists
 - [ ] T13b Lists & Trees · Trees
 - [ ] T13c Lists & Trees · Files
-- [ ] T14 Tables
+- [ ] T14a Tables · Core
+- [ ] T14b Tables · Columns & rows
+- [ ] T14c Tables · Grids
 - [ ] T15 Charts
 - [ ] T16a Finance · Market charts
 - [ ] T16b Finance · Technical analysis
@@ -191,3 +193,4 @@ Per-component lines live in `tasks/`. Tags there:
 | T13a | 1 | — | pending: codex still logged out |
 | T13b | 1 | — | pending: codex still logged out |
 | T13c | 1 | — | pending: codex still logged out |
+| T14a | 1 | — | pending: codex still logged out |
diff --git a/examples/gallery/pages/mod.rs b/examples/gallery/pages/mod.rs
index ce4a08e..d170d59 100644
--- a/examples/gallery/pages/mod.rs
+++ b/examples/gallery/pages/mod.rs
@@ -10,6 +10,7 @@ mod navigation;
 mod overlays;
 mod primitives;
 mod shell;
+mod tables;
 mod theme;
 mod typography;
 
@@ -41,6 +42,7 @@ pub const ALL: &[Page] = &[
     motion::PAGE,
     data::PAGE,
     lists::PAGE,
+    tables::PAGE,
     theme::PAGE,
 ];
 
diff --git a/examples/gallery/pages/tables/core.rs b/examples/gallery/pages/tables/core.rs
new file mode 100644
index 0000000..02814f3
--- /dev/null
+++ b/examples/gallery/pages/tables/core.rs
@@ -0,0 +1,247 @@
+use std::rc::Rc;
+
+use ely_gpui_component::{
+    buttons::SegmentedControl,
+    data_display::Tone,
+    forms::{SearchInput, TextInput},
+    tables::{Aggregate, Cell, Column, DataTable, HeatmapTable, Row, Table},
+    theme::{ActiveTheme, ControlSize, Density, Radius},
+    typography::Caption,
+};
+use gpui::{App, IntoElement, ParentElement, SharedString, Styled, Window, div, px, rems};
+
+use crate::{
+    probe::probe,
+    ui::{keep, section, set},
+};
+
+pub fn plain(cx: &mut App) -> impl IntoElement + use<> {
+    section(
+        "Table",
+        "A header and rows, hairlines between. Nothing more.",
+        cx,
+    )
+    .child(
+        div().w(px(560.)).child(
+            Table::new(["Name", "Role", "City"])
+                .row(["Ada Lovelace", "Analyst", "London"])
+                .row(["Grace Hopper", "Engineer", "Arlington"])
+                .row(["Katherine Johnson", "Mathematician", "Hampton"]),
+        ),
+    )
+}
+
+const PEOPLE: [&str; 10] = [
+    "Ada Lovelace",
+    "Alan Turing",
+    "Grace Hopper",
+    "Katherine Johnson",
+    "Tim Berners-Lee",
+    "Radia Perlman",
+    "Sophie Wilson",
+    "Barbara Liskov",
+    "Ken Thompson",
+    "Margaret Hamilton",
+];
+const REGIONS: [&str; 4] = ["Europe", "Americas", "Asia", "Oceania"];
+
+/// A steady pseudo-random series, so captures repeat.
+fn noise(seed: u64) -> impl FnMut() -> f64 {
+    let mut state = seed;
+    move || {
+        state = state
+            .wrapping_mul(6364136223846793005)
+            .wrapping_add(1442695040888963407);
+        (state >> 33) as f64 / (1u64 << 31) as f64
+    }
+}
+
+fn order_rows() -> Vec<Row> {
+    let mut next = noise(7);
+    (0..24)
+        .map(|ix| {
+            let (status, tone) = match (next() * 3.0) as u32 {
+                0 => ("Live", Tone::Success),
+                1 => ("Draft", Tone::Neutral),
+                _ => ("Review", Tone::Warning),
+            };
+            let spark: Vec<f32> = (0..8).map(|_| next() as f32).collect();
+            Row::new(
+                format!("order-{ix}"),
+                [
+                    Cell::Person(PEOPLE[ix % PEOPLE.len()].into()),
+                    Cell::Tag(status.into(), tone),
+                    REGIONS[(next() * 4.0) as usize].into(),
+                    (next() * 90_000.0 + 8_000.0).round().into(),
+                    ((next() - 0.35) * 40.0).into(),
+                    Cell::Spark(spark),
+                    Cell::Progress(next() as f32),
+                ],
+            )
+        })
+        .collect()
+}
+
+fn order_columns() -> [Column; 7] {
+    [
+        Column::new("owner", "Owner"),
+        Column::new("status", "Status").width(rems(6.)),
+        Column::new("region", "Region").width(rems(6.)),
+        Column::new("revenue", "Revenue")
+            .end()
+            .prefix("$")
+            .aggregate(Aggregate::Sum)
+            .width(rems(8.)),
+        Column::new("growth", "Growth")
+            .end()
+            .decimals(1)
+            .suffix("%")
+            .scale()
+            .aggregate(Aggregate::Average)
+            .width(rems(6.)),
+        Column::new("trend", "Trend").unsorted().width(rems(6.)),
+        Column::new("quota", "Quota")
+            .width(rems(9.))
+            .aggregate(Aggregate::Average),
+    ]
+}
+
+pub fn orders(window: &mut Window, cx: &mut App) -> impl IntoElement + use<> {
+    let search = window.use_keyed_state("orders-search", cx, TextInput::new);
+    let query = search.read(cx).text().to_string();
+    let picked = keep("orders-picked", Vec::<SharedString>::new, window, cx);
+    let density = keep(
+        "orders-density",
+        || SharedString::from("standard"),
+        window,
+        cx,
+    );
+    let (chosen, store, dense, pick) = (
+        picked.read(cx).clone(),
+        picked.clone(),
+        density.read(cx).clone(),
+        density.clone(),
+    );
+    let spacing = match dense.as_ref() {
+        "compact" => Density::Compact,
+        "comfortable" => Density::Comfortable,
+        _ => Density::Standard,
+    };
+    section(
+        "DataTable / CellRenderer / RowSelection / TableDensity / AggregationFooter / ConditionalFormatting",
+        "Press a header to sort, rising then falling. Search keeps rows that hold the text; boxes select, Shift takes a range. Cells draw people, tags, sparklines and progress; growth is tinted by where it sits; the footer sums and averages what the search keeps.",
+        cx,
+    )
+    .child(
+        div()
+            .flex()
+            .items_center()
+            .justify_between()
+            .w(px(900.))
+            .pb_3()
+            .child(div().w(px(260.)).child(SearchInput::new("orders-find", &search).size(ControlSize::Sm)))
+            .child(
+                SegmentedControl::new("orders-density", dense)
+                    .segment("compact", "Compact", None)
+                    .segment("standard", "Standard", None)
+                    .segment("comfortable", "Comfortable", None)
+                    .size(ControlSize::Sm)
+                    .on_change(move |value, _, cx| set(&pick, value.clone(), cx)),
+            ),
+    )
+    .child(probe(
+        "orders",
+        div().w(px(900.)).child(
+            DataTable::new("orders", order_columns())
+                .rows(order_rows())
+                .query(query)
+                .paged(8)
+                .density(spacing)
+                .selected(chosen.clone())
+                .on_select(move |keys, _, cx| set(&store, keys.to_vec(), cx)),
+        ),
+    ))
+    .child(Caption::new(format!("{} selected", chosen.len())))
+}
+
+pub fn long(window: &mut Window, cx: &mut App) -> impl IntoElement + use<> {
+    let rows = keep(
+        "long-rows",
+        || {
+            let mut next = noise(11);
+            Rc::new(
+                (0..100_000)
+                    .map(|ix| {
+                        Row::new(
+                            format!("long-{ix}"),
+                            [
+                                format!("Event {}", ix + 1).into(),
+                                REGIONS[ix % 4].into(),
+                                (next() * 1000.0).round().into(),
+                            ],
+                        )
+                    })
+                    .collect::<Vec<_>>(),
+            )
+        },
+        window,
+        cx,
+    )
+    .read(cx)
+    .clone();
+    let theme = cx.theme();
+    section(
+        "VirtualTable",
+        "A hundred thousand rows; only the ones in view are drawn, so it scrolls as lightly as ten.",
+        cx,
+    )
+    .child(
+        div()
+            .w(px(560.))
+            .h(px(300.))
+            .rounded(theme.radius(Radius::Md))
+            .border_1()
+            .border_color(theme.colors.border)
+            .child(
+                DataTable::new(
+                    "long",
+                    [
+                        Column::new("event", "Event"),
+                        Column::new("region", "Region"),
+                        Column::new("value", "Value").end().aggregate(Aggregate::Sum),
+                    ],
+                )
+                .rows(rows)
+                .virtualized()
+                .density(Density::Compact)
+                .size_full(),
+            ),
+    )
+}
+
+pub fn heatmap(cx: &mut App) -> impl IntoElement + use<> {
+    let mut next = noise(3);
+    let days = ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"];
+    let table = days.iter().enumerate().fold(
+        HeatmapTable::new(["6", "9", "12", "15", "18", "21"]),
+        |table, (day, name)| {
+            let busy = if day >= 5 { 0.5 } else { 1.0 };
+            table.row(
+                *name,
+                (0..6).map(|slot| {
+                    (busy
+                        * (40.0 + 60.0 * next())
+                        * if (1..=4).contains(&slot) { 1.6 } else { 0.7 })
+                    .round()
+                }),
+            )
+        },
+    );
+    section(
+        "HeatmapTable",
+        "Visits by weekday and hour; each cell is shaded by where it sits between the quietest and the busiest.",
+        cx,
+    )
+    .child(div().w(px(560.)).child(table))
+    .child(Caption::new("ComparisonTable is Comparison, in Data Display."))
+}
diff --git a/examples/gallery/pages/tables/mod.rs b/examples/gallery/pages/tables/mod.rs
new file mode 100644
index 0000000..2243dee
--- /dev/null
+++ b/examples/gallery/pages/tables/mod.rs
@@ -0,0 +1,39 @@
+mod core;
+
+use gpui::{AnyElement, App, IntoElement, ParentElement, Window, div};
+
+use super::Page;
+use crate::script::Step;
+
+pub const PAGE: Page = Page {
+    number: 14,
+    slug: "tables",
+    title: "Tables",
+    summary: "Rows and columns that sort, filter, page and select, and stay quick at a hundred thousand rows.",
+    render,
+    script: SCRIPT,
+};
+
+const SCRIPT: &[Step] = &[
+    Step::Rest,
+    Step::DownAt("orders", 440.0, 16.0),
+    Step::UpAt("orders", 440.0, 16.0),
+    Step::Wait(200),
+    Step::Shot("sorted"),
+    Step::DownAt("orders", 18.0, 54.0),
+    Step::UpAt("orders", 18.0, 54.0),
+    Step::DownAt("orders", 18.0, 126.0),
+    Step::UpAt("orders", 18.0, 126.0),
+    Step::Wait(200),
+    Step::Shot("selected"),
+    Step::Rest,
+];
+
+fn render(window: &mut Window, cx: &mut App) -> AnyElement {
+    div()
+        .child(core::plain(cx))
+        .child(core::orders(window, cx))
+        .child(core::long(window, cx))
+        .child(core::heatmap(cx))
+        .into_any_element()
+}
diff --git a/src/data_display/mod.rs b/src/data_display/mod.rs
index 507cc14..676b6e1 100644
--- a/src/data_display/mod.rs
+++ b/src/data_display/mod.rs
@@ -9,6 +9,7 @@ mod feed;
 mod gallery;
 mod measures;
 mod records;
+mod spark;
 mod stars;
 mod stat;
 #[cfg(test)]
@@ -27,6 +28,7 @@ pub use feed::{Activity, ActivityFeed};
 pub use gallery::Gallery;
 pub use measures::{Gauge, Meter, UsageBar};
 pub use records::{DescriptionList, PropertyGrid, PropertyGroup};
+pub use spark::Sparkline;
 pub use stars::Stars;
 pub(crate) use stars::star;
 pub use stat::{KpiCard, Statistic, TrendIndicator};
diff --git a/src/data_display/spark.rs b/src/data_display/spark.rs
new file mode 100644
index 0000000..810b207
--- /dev/null
+++ b/src/data_display/spark.rs
@@ -0,0 +1,163 @@
+use gpui::{
+    App, Bounds, Div, Hsla, IntoElement, ParentElement, PathBuilder, Pixels, Refineable,
+    RenderOnce, StyleRefinement, Styled, Window, canvas, div, fill, point, size,
+};
+
+use crate::theme::ActiveTheme;
+
+/// How a sparkline draws its series.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+enum Spark {
+    Line,
+    Area,
+    Bars,
+}
+
+/// Each value's height as a share of the series' own range; a flat series sits in the middle.
+fn shares(values: &[f32]) -> Vec<f32> {
+    let (low, high) = values.iter().fold((f32::MAX, f32::MIN), |(low, high), v| {
+        (low.min(*v), high.max(*v))
+    });
+    let span = high - low;
+    values
+        .iter()
+        .map(|value| {
+            if span > 0.0 {
+                (value - low) / span
+            } else {
+                0.5
+            }
+        })
+        .collect()
+}
+
+/// A word-sized chart of a series, scaled to its own range: a line, a filled area, or bars.
+#[derive(IntoElement)]
+pub struct Sparkline {
+    base: Div,
+    values: Vec<f32>,
+    spark: Spark,
+    color: Option<Hsla>,
+}
+
+impl Sparkline {
+    pub fn new(values: impl IntoIterator<Item = f32>) -> Self {
+        let values: Vec<f32> = values.into_iter().collect();
+        assert!(values.len() >= 2, "a sparkline needs two values");
+        assert!(
+            values.iter().all(|value| value.is_finite()),
+            "a sparkline needs finite values"
+        );
+        Self {
+            base: div(),
+            values,
+            spark: Spark::Line,
+            color: None,
+        }
+    }
+
+    /// The line with the area under it lightly filled.
+    pub fn area(mut self) -> Self {
+        self.spark = Spark::Area;
+        self
+    }
+
+    pub fn bars(mut self) -> Self {
+        self.spark = Spark::Bars;
+        self
+    }
+
+    /// Its ink; the foreground unless set.
+    pub fn color(mut self, color: Hsla) -> Self {
+        self.color = Some(color);
+        self
+    }
+}
+
+impl Styled for Sparkline {
+    fn style(&mut self) -> &mut StyleRefinement {
+        self.base.style()
+    }
+}
+
+impl RenderOnce for Sparkline {
+    fn render(mut self, _: &mut Window, cx: &mut App) -> impl IntoElement {
+        let theme = cx.theme();
+        let ink = self.color.unwrap_or(theme.colors.fg_muted);
+        let (heights, spark) = (shares(&self.values), self.spark);
+        let mut frame = div()
+            .flex_none()
+            .w(theme.spark_size().width)
+            .h(theme.spark_size().height);
+        frame.style().refine(self.base.style());
+        frame.child(
+            canvas(
+                |_, _, _| {},
+                move |bounds: Bounds<Pixels>, _, window, _| {
+                    let stroke = bounds.size.height / 12.0;
+                    let inner = bounds.size.height - stroke * 2.0;
+                    let count = heights.len() as f32;
+                    if spark == Spark::Bars {
+                        let slot = bounds.size.width / count;
+                        for (ix, share) in heights.iter().enumerate() {
+                            let tall = (inner * *share).max(stroke);
+                            let corner = point(
+                                bounds.left() + slot * ix as f32 + slot * 0.15,
+                                bounds.bottom() - tall,
+                            );
+                            window
+                                .paint_quad(fill(Bounds::new(corner, size(slot * 0.7, tall)), ink));
+                        }
+                        return;
+                    }
+                    let at = |ix: usize, share: f32| {
+                        point(
+                            bounds.left() + bounds.size.width * ix as f32 / (count - 1.0),
+                            bounds.top() + stroke + inner * (1.0 - share),
+                        )
+                    };
+                    if spark == Spark::Area {
+                        let mut area = PathBuilder::fill();
+                        area.move_to(point(bounds.left(), bounds.bottom()));
+                        for (ix, share) in heights.iter().enumerate() {
+                            area.line_to(at(ix, *share));
+                        }
+                        area.line_to(point(bounds.right(), bounds.bottom()));
+                        area.close();
+                        if let Ok(area) = area.build() {
+                            window.paint_path(area, ink.opacity(0.16));
+                        }
+                    }
+                    let mut line = PathBuilder::stroke(stroke);
+                    for (ix, share) in heights.iter().enumerate() {
+                        if ix == 0 {
+                            line.move_to(at(ix, *share));
+                        } else {
+                            line.line_to(at(ix, *share));
+                        }
+                    }
+                    match line.build() {
+                        Ok(line) => window.paint_path(line, ink),
+                        Err(error) => log::error!("sparkline: the line failed to build: {error:#}"),
+                    }
+                },
+            )
+            .size_full(),
+        )
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::shares;
+
+    #[test]
+    fn values_scale_to_their_own_range() {
+        assert_eq!(shares(&[2.0, 4.0, 3.0]), [0.0, 1.0, 0.5]);
+        assert_eq!(
+            shares(&[7.0, 7.0]),
+            [0.5, 0.5],
+            "a flat series sits in the middle"
+        );
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
index f850039..60c9aa5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -12,6 +12,7 @@ pub mod navigation;
 pub mod overlays;
 pub mod primitives;
 pub mod shell;
+pub mod tables;
 pub mod theme;
 pub mod typography;
 
diff --git a/src/lists/mod.rs b/src/lists/mod.rs
index 8c18e2f..20ea0bb 100644
--- a/src/lists/mod.rs
+++ b/src/lists/mod.rs
@@ -18,6 +18,7 @@ pub use item::{List, ListItem};
 pub use long::{InfiniteList, VirtualList};
 pub use outline::Outline;
 pub use select::SelectableList;
+pub(crate) use select::{Pick, picked};
 pub use sortable::SortableList;
 pub use swipe::{SwipeAction, SwipeableListItem};
 pub use tree::{DropAt, Tree, TreeNode, TreeSelect};
diff --git a/src/lists/select.rs b/src/lists/select.rs
index 400ec31..ec60f1f 100644
--- a/src/lists/select.rs
+++ b/src/lists/select.rs
@@ -10,7 +10,7 @@ use crate::primitives::tab_stop;
 
 /// How a press or a key picks rows.
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
-pub(super) enum Pick {
+pub(crate) enum Pick {
     One,
     Toggle,
     Range,
@@ -18,7 +18,7 @@ pub(super) enum Pick {
 }
 
 /// The selection after picking row `at`, a range reaching back to `anchor`; in row order.
-pub(super) fn picked(
+pub(crate) fn picked(
     keys: &[SharedString],
     selected: &[SharedString],
     anchor: usize,
diff --git a/src/tables/body.rs b/src/tables/body.rs
new file mode 100644
index 0000000..8da0d5d
--- /dev/null
+++ b/src/tables/body.rs
@@ -0,0 +1,117 @@
+use std::rc::Rc;
+
+use gpui::{
+    AnyElement, App, ElementId, InteractiveElement, IntoElement, MouseButton, ParentElement, Rems,
+    SharedString, StatefulInteractiveElement, Styled, div, prelude::*,
+};
+
+use super::{Align, Column, Row, cell::draw, model::tint};
+use crate::{
+    forms::{CheckState, check_mark},
+    lists::Pick,
+    theme::{ActiveTheme, TextSize},
+};
+
+pub(super) type Select = Rc<dyn Fn(usize, Pick, &mut gpui::Window, &mut App)>;
+
+/// Gives a cell its column's width: fixed, or a share of what is left.
+pub(super) fn sized<E: Styled>(cell: E, column: &Column) -> E {
+    let cell = match column.width {
+        Some(width) => cell.w(width).flex_none(),
+        None => cell.flex_1().min_w_0(),
+    };
+    if column.align == Align::End {
+        cell.justify_end()
+    } else {
+        cell
+    }
+}
+
+/// What drawing a row needs, shared by pages and by a long table's list.
+pub(super) struct Body {
+    pub id: ElementId,
+    pub columns: Rc<Vec<Column>>,
+    pub rows: Rc<Vec<Row>>,
+    pub keys: Rc<Vec<SharedString>>,
+    pub shown: Rc<Vec<usize>>,
+    pub offset: usize,
+    pub selected: Option<Rc<Vec<SharedString>>>,
+    pub select: Option<Select>,
+    pub ranges: Rc<Vec<Option<(f64, f64)>>>,
+    pub height: Rems,
+    pub check: Rems,
+}
+
+impl Body {
+    pub(super) fn row(&self, at: usize, cx: &App) -> AnyElement {
+        let ix = self.shown[at];
+        let key = self.keys[ix].clone();
+        let on = self
+            .selected
+            .as_ref()
+            .is_some_and(|selected| selected.contains(&key));
+        let theme = cx.theme();
+        let colors = &theme.colors;
+        let position = self.offset + at;
+        let press = self.select.clone();
+        div()
+            .id((self.id.clone(), format!("row-{key}")))
+            .flex()
+            .items_center()
+            .w_full()
+            .h(self.height)
+            .border_b_1()
+            .border_color(colors.border)
+            .text_size(theme.text_size(TextSize::Sm))
+            .text_color(colors.fg)
+            .when(on, |row| row.bg(colors.active))
+            .when(!on, |row| row.hover(|style| style.bg(colors.hover)))
+            .when_some(self.select.clone(), |row, select| {
+                row.cursor_pointer()
+                    .child(
+                        div()
+                            .flex_none()
+                            .w(self.check)
+                            .flex()
+                            .justify_center()
+                            .on_mouse_down(MouseButton::Left, move |_, window, cx| {
+                                cx.stop_propagation();
+                                select(position, Pick::Toggle, window, cx);
+                            })
+                            .child(check_mark(
+                                if on { CheckState::On } else { CheckState::Off },
+                                false,
+                                false,
+                                0,
+                                cx,
+                            )),
+                    )
+                    .on_click(move |event, window, cx| {
+                        let held = event.modifiers();
+                        let how = match (held.shift, held.platform) {
+                            (true, _) => Pick::Range,
+                            (false, true) => Pick::Toggle,
+                            _ => Pick::One,
+                        };
+                        if let Some(press) = &press {
+                            press(position, how, window, cx);
+                        }
+                    })
+            })
+            .children(self.columns.iter().enumerate().map(|(col, column)| {
+                let cell = &self.rows[ix].cells[col];
+                let tinted = self.ranges[col]
+                    .zip(cell.number())
+                    .map(|(range, value)| tint(value, range, colors));
+                sized(div().h_full().flex().items_center().px_3(), column)
+                    .when_some(tinted, |cell, bg| cell.bg(bg))
+                    .child(draw(
+                        cell,
+                        column,
+                        (self.id.clone(), format!("cell-{key}-{col}")).into(),
+                        cx,
+                    ))
+            }))
+            .into_any_element()
+    }
+}
diff --git a/src/tables/cell.rs b/src/tables/cell.rs
new file mode 100644
index 0000000..443413c
--- /dev/null
+++ b/src/tables/cell.rs
@@ -0,0 +1,228 @@
+use gpui::{
+    AnyElement, App, ElementId, IntoElement, ParentElement, Rems, SharedString, Styled, div,
+};
+
+use crate::{
+    data_display::{Avatar, Badge, Sparkline, Tone},
+    motion::ProgressBar,
+    theme::{ActiveTheme, AvatarSize},
+    typography::{ExternalLink, format, tabular},
+};
+
+/// What a cell holds; its column says how numbers read.
+#[derive(Clone, Debug, PartialEq)]
+pub enum Cell {
+    Empty,
+    Text(SharedString),
+    Number(f64),
+    Tag(SharedString, Tone),
+    /// A share from 0 to 1, drawn as a bar with its percent.
+    Progress(f32),
+    Spark(Vec<f32>),
+    /// A person's name beside their initials.
+    Person(SharedString),
+    /// A label, and the address it opens.
+    Link(SharedString, SharedString),
+}
+
+impl Cell {
+    /// The words a filter looks through and a sort compares.
+    pub(crate) fn words(&self) -> SharedString {
+        match self {
+            Self::Text(text) | Self::Tag(text, _) | Self::Person(text) | Self::Link(text, _) => {
+                text.clone()
+            }
+            Self::Number(value) => value.to_string().into(),
+            Self::Progress(share) => share.to_string().into(),
+            Self::Empty | Self::Spark(_) => SharedString::default(),
+        }
+    }
+
+    /// The value a sort and a figure use, for cells that count.
+    pub(crate) fn number(&self) -> Option<f64> {
+        match self {
+            Self::Number(value) => Some(*value),
+            Self::Progress(share) => Some(f64::from(*share)),
+            _ => None,
+        }
+    }
+}
+
+impl From<&'static str> for Cell {
+    fn from(text: &'static str) -> Self {
+        Self::Text(text.into())
+    }
+}
+
+impl From<String> for Cell {
+    fn from(text: String) -> Self {
+        Self::Text(text.into())
+    }
+}
+
+impl From<f64> for Cell {
+    fn from(value: f64) -> Self {
+        Self::Number(value)
+    }
+}
+
+#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
+pub enum Align {
+    #[default]
+    Start,
+    End,
+}
+
+/// A figure the footer shows for a column.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum Aggregate {
+    Sum,
+    Average,
+    Count,
+    Min,
+    Max,
+}
+
+impl Aggregate {
+    pub(crate) fn label(self) -> &'static str {
+        match self {
+            Self::Sum => "Sum",
+            Self::Average => "Avg",
+            Self::Count => "Count",
+            Self::Min => "Min",
+            Self::Max => "Max",
+        }
+    }
+}
+
+/// A column: its key and title, its width, and how its cells read.
+#[derive(Clone, Debug)]
+pub struct Column {
+    pub(crate) key: SharedString,
+    pub(crate) title: SharedString,
+    pub(crate) width: Option<Rems>,
+    pub(crate) align: Align,
+    pub(crate) sortable: bool,
+    pub(crate) decimals: usize,
+    pub(crate) prefix: Option<SharedString>,
+    pub(crate) suffix: Option<SharedString>,
+    pub(crate) aggregate: Option<Aggregate>,
+    pub(crate) scale: bool,
+}
+
+impl Column {
+    pub fn new(key: impl Into<SharedString>, title: impl Into<SharedString>) -> Self {
+        Self {
+            key: key.into(),
+            title: title.into(),
+            width: None,
+            align: Align::Start,
+            sortable: true,
+            decimals: 0,
+            prefix: None,
+            suffix: None,
+            aggregate: None,
+            scale: false,
+        }
+    }
+
+    /// A fixed width; columns without one share what is left.
+    pub fn width(mut self, width: Rems) -> Self {
+        self.width = Some(width);
+        self
+    }
+
+    /// Sets its cells to the end, as numbers read.
+    pub fn end(mut self) -> Self {
+        self.align = Align::End;
+        self
+    }
+
+    /// Its header does not sort.
+    pub fn unsorted(mut self) -> Self {
+        self.sortable = false;
+        self
+    }
+
+    pub fn decimals(mut self, decimals: usize) -> Self {
+        self.decimals = decimals;
+        self
+    }
+
+    pub fn prefix(mut self, text: impl Into<SharedString>) -> Self {
+        self.prefix = Some(text.into());
+        self
+    }
+
+    pub fn suffix(mut self, text: impl Into<SharedString>) -> Self {
+        self.suffix = Some(text.into());
+        self
+    }
+
+    /// A figure for the footer, over the rows the filter keeps.
+    pub fn aggregate(mut self, aggregate: Aggregate) -> Self {
+        self.aggregate = Some(aggregate);
+        self
+    }
+
+    /// Tints each number by where it sits in the column: red low, green high.
+    pub fn scale(mut self) -> Self {
+        self.scale = true;
+        self
+    }
+
+    /// A number as this column reads it.
+    pub(crate) fn reads(&self, value: f64) -> String {
+        format!(
+            "{}{}{}",
+            self.prefix.as_ref().map_or("", |text| text.as_ref()),
+            format::number(value, self.decimals, format::Separators::EN),
+            self.suffix.as_ref().map_or("", |text| text.as_ref())
+        )
+    }
+}
+
+/// A cell drawn as its kind asks.
+pub(crate) fn draw(cell: &Cell, column: &Column, id: ElementId, cx: &App) -> AnyElement {
+    let colors = &cx.theme().colors;
+    match cell {
+        Cell::Empty => div().into_any_element(),
+        Cell::Text(text) => div()
+            .min_w_0()
+            .truncate()
+            .child(text.clone())
+            .into_any_element(),
+        Cell::Number(value) => tabular(div())
+            .child(column.reads(*value))
+            .into_any_element(),
+        Cell::Tag(text, tone) => Badge::new(text.clone()).tone(*tone).into_any_element(),
+        Cell::Progress(share) => div()
+            .flex()
+            .items_center()
+            .gap_2()
+            .w_full()
+            .child(
+                div()
+                    .flex_1()
+                    .child(ProgressBar::new(id, share.clamp(0.0, 1.0))),
+            )
+            .child(
+                tabular(div())
+                    .text_color(colors.fg_muted)
+                    .child(format::percent(f64::from(*share), 0, false)),
+            )
+            .into_any_element(),
+        Cell::Spark(values) => Sparkline::new(values.iter().copied()).into_any_element(),
+        Cell::Person(name) => div()
+            .flex()
+            .items_center()
+            .gap_2()
+            .min_w_0()
+            .child(Avatar::new(id, name.clone()).size(AvatarSize::Xs))
+            .child(div().min_w_0().truncate().child(name.clone()))
+            .into_any_element(),
+        Cell::Link(label, url) => {
+            ExternalLink::new(id, label.clone(), url.clone()).into_any_element()
+        }
+    }
+}
diff --git a/src/tables/mod.rs b/src/tables/mod.rs
new file mode 100644
index 0000000..ab8f0d3
--- /dev/null
+++ b/src/tables/mod.rs
@@ -0,0 +1,11 @@
+mod body;
+mod cell;
+mod model;
+mod simple;
+mod table;
+#[cfg(test)]
+mod tests;
+
+pub use cell::{Aggregate, Align, Cell, Column};
+pub use simple::{HeatmapTable, Table};
+pub use table::{DataTable, Row};
diff --git a/src/tables/model.rs b/src/tables/model.rs
new file mode 100644
index 0000000..1a82a2d
--- /dev/null
+++ b/src/tables/model.rs
@@ -0,0 +1,159 @@
+use std::cmp::Ordering;
+
+use gpui::Hsla;
+
+use super::{Aggregate, Row};
+use crate::theme::{Mix, Palette};
+
+/// Rows holding `query` in any cell, ignoring case; every row when it is empty.
+pub(crate) fn filtered(rows: &[Row], query: &str) -> Vec<usize> {
+    let query = query.trim().to_lowercase();
+    (0..rows.len())
+        .filter(|ix| {
+            query.is_empty()
+                || rows[*ix]
+                    .cells
+                    .iter()
+                    .any(|cell| cell.words().to_lowercase().contains(&query))
+        })
+        .collect()
+}
+
+/// `order` sorted by column `col`, rising or falling: numbers by value, the rest by their words; ties keep their order.
+pub(crate) fn sorted(rows: &[Row], mut order: Vec<usize>, col: usize, rising: bool) -> Vec<usize> {
+    order.sort_by(|a, b| {
+        let (a, b) = (&rows[*a].cells[col], &rows[*b].cells[col]);
+        let by = match (a.number(), b.number()) {
+            (Some(a), Some(b)) => a.partial_cmp(&b).unwrap_or(Ordering::Equal),
+            _ => a.words().to_lowercase().cmp(&b.words().to_lowercase()),
+        };
+        if rising { by } else { by.reverse() }
+    });
+    order
+}
+
+/// Column `col`'s figure over `order`; none when no cell counts.
+pub(crate) fn figure(rows: &[Row], order: &[usize], col: usize, how: Aggregate) -> Option<f64> {
+    let values: Vec<f64> = order
+        .iter()
+        .filter_map(|ix| rows[*ix].cells[col].number())
+        .collect();
+    if how == Aggregate::Count {
+        return Some(values.len() as f64);
+    }
+    if values.is_empty() {
+        return None;
+    }
+    let sum: f64 = values.iter().sum();
+    Some(match how {
+        Aggregate::Sum => sum,
+        Aggregate::Average => sum / values.len() as f64,
+        Aggregate::Min => values.iter().copied().fold(f64::MAX, f64::min),
+        Aggregate::Max => values.iter().copied().fold(f64::MIN, f64::max),
+        Aggregate::Count => unreachable!("counted above"),
+    })
+}
+
+/// The lowest and highest numbers in column `col`, across every row.
+pub(crate) fn range(rows: &[Row], col: usize) -> Option<(f64, f64)> {
+    rows.iter()
+        .filter_map(|row| row.cells[col].number())
+        .fold(None, |range, value| match range {
+            None => Some((value, value)),
+            Some((low, high)) => Some((low.min(value), high.max(value))),
+        })
+}
+
+/// A value's tint in a range: red at the bottom, clear in the middle, green at the top.
+pub(crate) fn tint(value: f64, (low, high): (f64, f64), colors: &Palette) -> Hsla {
+    let share = if high > low {
+        ((value - low) / (high - low)) as f32
+    } else {
+        0.5
+    };
+    if share < 0.5 {
+        colors
+            .danger_subtle
+            .mix(&colors.danger_subtle.opacity(0.0), share * 2.0)
+    } else {
+        colors
+            .success_subtle
+            .opacity(0.0)
+            .mix(&colors.success_subtle, share * 2.0 - 1.0)
+    }
+}
+
+/// The part of `order` on page `page`, counted from zero, `size` rows a page.
+pub(crate) fn page(order: &[usize], page: usize, size: usize) -> &[usize] {
+    let start = (page * size).min(order.len());
+    &order[start..(start + size).min(order.len())]
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::{data_display::Tone, tables::Cell};
+
+    fn rows() -> Vec<Row> {
+        [
+            [
+                "Grace".into(),
+                42.0.into(),
+                Cell::Tag("Live".into(), Tone::Success),
+            ],
+            [
+                "alan".into(),
+                7.0.into(),
+                Cell::Tag("Draft".into(), Tone::Neutral),
+            ],
+            ["Ada".into(), 7.0.into(), Cell::Empty],
+            [
+                "Katherine".into(),
+                105.5.into(),
+                Cell::Tag("Live".into(), Tone::Success),
+            ],
+        ]
+        .into_iter()
+        .enumerate()
+        .map(|(ix, cells)| Row::new(ix.to_string(), cells))
+        .collect()
+    }
+
+    #[test]
+    fn a_query_keeps_rows_holding_it_anywhere() {
+        assert_eq!(filtered(&rows(), "live"), [0, 3]);
+        assert_eq!(filtered(&rows(), "  "), [0, 1, 2, 3]);
+    }
+
+    #[test]
+    fn numbers_sort_by_value_and_words_ignore_case() {
+        let rows = rows();
+        assert_eq!(
+            sorted(&rows, vec![0, 1, 2, 3], 1, true),
+            [1, 2, 0, 3],
+            "ties keep their order"
+        );
+        assert_eq!(sorted(&rows, vec![0, 1, 2, 3], 1, false), [3, 0, 1, 2]);
+        assert_eq!(sorted(&rows, vec![0, 1, 2, 3], 0, true), [2, 1, 0, 3]);
+    }
+
+    #[test]
+    fn figures_count_only_what_counts() {
+        let rows = rows();
+        let all = [0, 1, 2, 3];
+        assert_eq!(figure(&rows, &all, 1, Aggregate::Sum), Some(161.5));
+        assert_eq!(figure(&rows, &all, 1, Aggregate::Average), Some(40.375));
+        assert_eq!(figure(&rows, &[1, 2], 1, Aggregate::Max), Some(7.0));
+        assert_eq!(figure(&rows, &all, 0, Aggregate::Sum), None);
+        assert_eq!(figure(&rows, &all, 0, Aggregate::Count), Some(0.0));
+        assert_eq!(range(&rows, 1), Some((7.0, 105.5)));
+    }
+
+    #[test]
+    fn a_page_is_a_slice_that_stops_at_the_end() {
+        let order: Vec<usize> = (0..7).collect();
+        assert_eq!(page(&order, 1, 3), [3, 4, 5]);
+        assert_eq!(page(&order, 2, 3), [6]);
+        assert!(page(&order, 5, 3).is_empty());
+    }
+}
diff --git a/src/tables/simple.rs b/src/tables/simple.rs
new file mode 100644
index 0000000..5c2c0ca
--- /dev/null
+++ b/src/tables/simple.rs
@@ -0,0 +1,192 @@
+use gpui::{
+    AnyElement, App, FontWeight, IntoElement, ParentElement, RenderOnce, SharedString, Styled,
+    Window, div, prelude::*,
+};
+
+use crate::{
+    theme::{ActiveTheme, Density, Radius, TextSize},
+    typography::{format, tabular},
+};
+
+/// A plain table: a header and rows of cells with hairlines between. To sort, page or select, use `DataTable`.
+#[derive(IntoElement)]
+pub struct Table {
+    headers: Vec<SharedString>,
+    rows: Vec<Vec<AnyElement>>,
+}
+
+impl Table {
+    pub fn new(headers: impl IntoIterator<Item = impl Into<SharedString>>) -> Self {
+        Self {
+            headers: headers.into_iter().map(Into::into).collect(),
+            rows: Vec::new(),
+        }
+    }
+
+    pub fn row(mut self, cells: impl IntoIterator<Item = impl IntoElement>) -> Self {
+        let cells: Vec<AnyElement> = cells
+            .into_iter()
+            .map(IntoElement::into_any_element)
+            .collect();
+        assert_eq!(
+            cells.len(),
+            self.headers.len(),
+            "a row needs a cell per header"
+        );
+        self.rows.push(cells);
+        self
+    }
+}
+
+impl RenderOnce for Table {
+    fn render(self, _: &mut Window, cx: &mut App) -> impl IntoElement {
+        let theme = cx.theme();
+        let colors = &theme.colors;
+        let last = self.rows.len().saturating_sub(1);
+        let cell = || div().flex_1().min_w_0().px_3().py_2();
+        div()
+            .flex()
+            .flex_col()
+            .text_size(theme.text_size(TextSize::Sm))
+            .child(
+                div()
+                    .flex()
+                    .border_b_1()
+                    .border_color(colors.border)
+                    .text_size(theme.text_size(TextSize::Xs))
+                    .font_weight(FontWeight::MEDIUM)
+                    .text_color(colors.fg_muted)
+                    .children(self.headers.into_iter().map(|header| cell().child(header))),
+            )
+            .children(self.rows.into_iter().enumerate().map(|(ix, row)| {
+                div()
+                    .flex()
+                    .text_color(colors.fg)
+                    .when(ix < last, |row| {
+                        row.border_b_1().border_color(colors.border)
+                    })
+                    .children(row.into_iter().map(|content| cell().child(content)))
+            }))
+    }
+}
+
+/// Numbers in a grid, each cell shaded by where it sits between the grid's lowest and highest, its value on top.
+#[derive(IntoElement)]
+pub struct HeatmapTable {
+    columns: Vec<SharedString>,
+    rows: Vec<(SharedString, Vec<f64>)>,
+    decimals: usize,
+}
+
+impl HeatmapTable {
+    pub fn new(columns: impl IntoIterator<Item = impl Into<SharedString>>) -> Self {
+        Self {
+            columns: columns.into_iter().map(Into::into).collect(),
+            rows: Vec::new(),
+            decimals: 0,
+        }
+    }
+
+    pub fn row(
+        mut self,
+        label: impl Into<SharedString>,
+        values: impl IntoIterator<Item = f64>,
+    ) -> Self {
+        let values: Vec<f64> = values.into_iter().collect();
+        assert_eq!(
+            values.len(),
+            self.columns.len(),
+            "a row needs a value per column"
+        );
+        assert!(
+            values.iter().all(|value| value.is_finite()),
+            "a heatmap needs finite values"
+        );
+        self.rows.push((label.into(), values));
+        self
+    }
+
+    pub fn decimals(mut self, decimals: usize) -> Self {
+        self.decimals = decimals;
+        self
+    }
+}
+
+impl RenderOnce for HeatmapTable {
+    fn render(self, _: &mut Window, cx: &mut App) -> impl IntoElement {
+        let theme = cx.theme();
+        let colors = &theme.colors;
+        let (low, high) = self
+            .rows
+            .iter()
+            .flat_map(|(_, values)| values.iter().copied())
+            .fold((f64::MAX, f64::MIN), |(low, high), value| {
+                (low.min(value), high.max(value))
+            });
+        let share = |value: f64| {
+            if high > low {
+                ((value - low) / (high - low)) as f32
+            } else {
+                0.5
+            }
+        };
+        let (hue, height, decimals) = (
+            colors.chart[0],
+            theme.table_row(Density::Standard),
+            self.decimals,
+        );
+        let label = |text: SharedString| {
+            div()
+                .flex_none()
+                .w(theme.label_width() * 0.6)
+                .flex()
+                .items_center()
+                .text_size(theme.text_size(TextSize::Xs))
+                .text_color(colors.fg_muted)
+                .child(text)
+        };
+        div()
+            .flex()
+            .flex_col()
+            .gap_0p5()
+            .text_size(theme.text_size(TextSize::Sm))
+            .child(
+                div()
+                    .flex()
+                    .gap_0p5()
+                    .child(label(SharedString::default()))
+                    .children(self.columns.into_iter().map(|column| {
+                        div()
+                            .flex_1()
+                            .flex()
+                            .justify_center()
+                            .text_size(theme.text_size(TextSize::Xs))
+                            .text_color(colors.fg_muted)
+                            .child(column)
+                    })),
+            )
+            .children(self.rows.into_iter().map(|(name, values)| {
+                div()
+                    .flex()
+                    .gap_0p5()
+                    .child(label(name))
+                    .children(values.into_iter().map(|value| {
+                        let share = share(value);
+                        tabular(div())
+                            .flex_1()
+                            .h(height)
+                            .flex()
+                            .items_center()
+                            .justify_center()
+                            .rounded(theme.radius(Radius::Sm))
+                            .bg(hue.opacity(0.08 + 0.84 * share))
+                            .text_color(if share > 0.55 {
+                                colors.on_media
+                            } else {
+                                colors.fg
+                            })
+                            .child(format::number(value, decimals, format::Separators::EN))
+                    }))
+            }))
+    }
+}
diff --git a/src/tables/table.rs b/src/tables/table.rs
new file mode 100644
index 0000000..d82ea19
--- /dev/null
+++ b/src/tables/table.rs
@@ -0,0 +1,417 @@
+use std::rc::Rc;
+
+use gpui::{
+    AnyElement, App, Div, ElementId, Entity, FontWeight, InteractiveElement, IntoElement,
+    ParentElement, RenderOnce, SharedString, StatefulInteractiveElement, StyleRefinement, Styled,
+    UniformListScrollHandle, Window, div, prelude::*, uniform_list,
+};
+
+use super::{
+    Aggregate, Cell, Column,
+    body::{Body, Select, sized},
+    model::{figure, filtered, page, range, sorted},
+};
+use crate::{
+    forms::{CheckState, check_mark},
+    lists::{Pick, picked},
+    navigation::Pagination,
+    primitives::{Icon, IconName},
+    theme::{ActiveTheme, Density, IconSize, TextSize},
+    typography::{Caption, format},
+};
+
+/// One row: its key, which a selection names it by, and a cell for each column.
+#[derive(Clone, Debug, PartialEq)]
+pub struct Row {
+    pub(crate) key: SharedString,
+    pub(crate) cells: Vec<Cell>,
+}
+
+impl Row {
+    pub fn new(key: impl Into<SharedString>, cells: impl IntoIterator<Item = Cell>) -> Self {
+        Self {
+            key: key.into(),
+            cells: cells.into_iter().collect(),
+        }
+    }
+}
+
+/// The sort, the page, where a Shift range starts, and the scroll of a long table.
+#[derive(Default)]
+struct View {
+    sort: Option<(usize, bool)>,
+    page: usize,
+    anchor: usize,
+    scroll: UniformListScrollHandle,
+}
+
+type OnSelect = Rc<dyn Fn(&[SharedString], &mut Window, &mut App)>;
+/// Rows under headers that sort, rising then falling then as given. A query keeps rows holding it; pages split long results, or a long table draws only the rows in view. With a selection, a box leads each row: a press picks one, Cmd adds, Shift takes a range, the header box takes all. Footers show figures; tinted columns show where each number sits.
+#[derive(IntoElement)]
+pub struct DataTable {
+    id: ElementId,
+    base: Div,
+    columns: Vec<Column>,
+    rows: Rc<Vec<Row>>,
+    query: SharedString,
+    page_size: Option<usize>,
+    virtualized: bool,
+    selected: Option<Vec<SharedString>>,
+    on_select: Option<OnSelect>,
+    density: Density,
+}
+
+impl DataTable {
+    pub fn new(id: impl Into<ElementId>, columns: impl IntoIterator<Item = Column>) -> Self {
+        Self {
+            id: id.into(),
+            base: div(),
+            columns: columns.into_iter().collect(),
+            rows: Rc::default(),
+            query: SharedString::default(),
+            page_size: None,
+            virtualized: false,
+            selected: None,
+            on_select: None,
+            density: Density::Standard,
+        }
+    }
+
+    /// The rows, owned or shared; a shared list is not copied.
+    pub fn rows(mut self, rows: impl Into<Rc<Vec<Row>>>) -> Self {
+        self.rows = rows.into();
+        self
+    }
+
+    /// Keeps the rows holding this text in any cell.
+    pub fn query(mut self, query: impl Into<SharedString>) -> Self {
+        self.query = query.into();
+        self
+    }
+
+    /// Splits the rows into pages of `size`.
+    pub fn paged(mut self, size: usize) -> Self {
+        assert!(size > 0, "a page holds at least a row");
+        self.page_size = Some(size);
+        self
+    }
+
+    /// Draws only the rows in view, for long tables. Give it a height.
+    pub fn virtualized(mut self) -> Self {
+        self.virtualized = true;
+        self
+    }
+
+    /// Shows a box on each row; `keys` are the rows selected.
+    pub fn selected(mut self, keys: impl IntoIterator<Item = impl Into<SharedString>>) -> Self {
+        self.selected = Some(keys.into_iter().map(Into::into).collect());
+        self
+    }
+
+    pub fn on_select(
+        mut self,
+        handler: impl Fn(&[SharedString], &mut Window, &mut App) + 'static,
+    ) -> Self {
+        self.on_select = Some(Rc::new(handler));
+        self
+    }
+
+    pub fn density(mut self, density: Density) -> Self {
+        self.density = density;
+        self
+    }
+}
+
+impl Styled for DataTable {
+    fn style(&mut self) -> &mut StyleRefinement {
+        self.base.style()
+    }
+}
+
+/// The next sort after a press on column `col`: rising, then falling, then none.
+fn next_sort(sort: Option<(usize, bool)>, col: usize) -> Option<(usize, bool)> {
+    match sort {
+        Some((was, true)) if was == col => Some((col, false)),
+        Some((was, false)) if was == col => None,
+        _ => Some((col, true)),
+    }
+}
+
+impl RenderOnce for DataTable {
+    fn render(self, window: &mut Window, cx: &mut App) -> impl IntoElement {
+        let id = self.id.clone();
+        let count = self.columns.len();
+        for row in self.rows.iter() {
+            assert_eq!(
+                row.cells.len(),
+                count,
+                "row {} needs a cell per column",
+                row.key
+            );
+        }
+        let view: Entity<View> =
+            window.use_keyed_state((id.clone(), "view"), cx, |_, _| View::default());
+        let (sort, page_at, scroll) = {
+            let view = view.read(cx);
+            (view.sort, view.page, view.scroll.clone())
+        };
+        let rows = self.rows;
+        let keys: Rc<Vec<SharedString>> = Rc::new(rows.iter().map(|row| row.key.clone()).collect());
+        let mut order = filtered(&rows, &self.query);
+        if let Some((col, rising)) = sort {
+            order = sorted(&rows, order, col, rising);
+        }
+        let total = order.len();
+        let pages = self.page_size.map(|size| total.div_ceil(size).max(1));
+        let page_at = pages.map_or(0, |pages| page_at.min(pages - 1));
+        let (shown, offset) = match self.page_size {
+            Some(size) => (page(&order, page_at, size).to_vec(), page_at * size),
+            None => (order.clone(), 0),
+        };
+        let columns = Rc::new(self.columns);
+        let ranges: Rc<Vec<_>> = Rc::new(
+            columns
+                .iter()
+                .enumerate()
+                .map(|(col, column)| column.scale.then(|| range(&rows, col)).flatten())
+                .collect(),
+        );
+        let ordered: Rc<Vec<SharedString>> =
+            Rc::new(order.iter().map(|ix| keys[*ix].clone()).collect());
+        let selected = self.selected.map(Rc::new);
+        let select: Option<Select> = selected.clone().map(|selected| {
+            let (view, ordered, on_select, id) = (
+                view.clone(),
+                ordered.clone(),
+                self.on_select.clone(),
+                id.clone(),
+            );
+            Rc::new(
+                move |position: usize, how: Pick, window: &mut Window, cx: &mut App| {
+                    let next = picked(&ordered, &selected, view.read(cx).anchor, position, how);
+                    view.update(cx, |view, _| {
+                        if how != Pick::Range {
+                            view.anchor = position;
+                        }
+                    });
+                    log::info!("data table {id:?}: {} selected", next.len());
+                    if let Some(on_select) = &on_select {
+                        on_select(&next, window, cx);
+                    }
+                },
+            ) as Select
+        });
+        let theme = cx.theme();
+        let colors = &theme.colors;
+        let height = theme.table_row(self.density);
+        let check = theme.control_height(crate::theme::ControlSize::Md);
+        let all = selected.as_ref().map(|selected| {
+            let on = ordered.iter().filter(|key| selected.contains(key)).count();
+            match on {
+                0 => CheckState::Off,
+                on if on == ordered.len() => CheckState::On,
+                _ => CheckState::Mixed,
+            }
+        });
+        let header = div()
+            .flex()
+            .items_center()
+            .h(height)
+            .border_b_1()
+            .border_color(colors.border)
+            .text_size(theme.text_size(TextSize::Xs))
+            .font_weight(FontWeight::MEDIUM)
+            .text_color(colors.fg_muted)
+            .when_some(all.zip(selected.clone()), |header, (state, selected)| {
+                let (ordered, on_select) = (ordered.clone(), self.on_select.clone());
+                header.child(
+                    div()
+                        .id((id.clone(), "all"))
+                        .flex_none()
+                        .w(check)
+                        .flex()
+                        .justify_center()
+                        .cursor_pointer()
+                        .on_click(move |_, window, cx| {
+                            let next: Vec<SharedString> = if state == CheckState::On {
+                                selected
+                                    .iter()
+                                    .filter(|key| !ordered.contains(key))
+                                    .cloned()
+                                    .collect()
+                            } else {
+                                let mut next = (*selected).clone();
+                                next.extend(
+                                    ordered
+                                        .iter()
+                                        .filter(|key| !selected.contains(key))
+                                        .cloned(),
+                                );
+                                next
+                            };
+                            if let Some(on_select) = &on_select {
+                                on_select(&next, window, cx);
+                            }
+                        })
+                        .child(check_mark(state, false, false, 0, cx)),
+                )
+            })
+            .children(columns.iter().enumerate().map(|(col, column)| {
+                let here = sort
+                    .filter(|(sorted, _)| *sorted == col)
+                    .map(|(_, rising)| rising);
+                let (view, id) = (view.clone(), id.clone());
+                sized(
+                    div()
+                        .id((self.id.clone(), format!("head-{}", column.key)))
+                        .h_full()
+                        .flex()
+                        .items_center()
+                        .gap_1()
+                        .px_3(),
+                    column,
+                )
+                .when(column.sortable, |head| {
+                    head.cursor_pointer()
+                        .hover(|style| style.text_color(colors.fg))
+                        .on_click(move |_, _, cx| {
+                            view.update(cx, |view, cx| {
+                                view.sort = next_sort(view.sort, col);
+                                view.page = 0;
+                                log::info!("data table {id:?}: sort {:?}", view.sort);
+                                cx.notify();
+                            })
+                        })
+                })
+                .child(column.title.clone())
+                .children(here.map(|rising| {
+                    Icon::new(if rising {
+                        IconName::ArrowUp
+                    } else {
+                        IconName::ArrowDown
+                    })
+                    .size(IconSize::Xs)
+                    .color(colors.fg_muted)
+                }))
+            }));
+        let figures = columns
+            .iter()
+            .any(|column| column.aggregate.is_some())
+            .then(|| {
+                div()
+                    .flex()
+                    .items_center()
+                    .h(height)
+                    .text_size(theme.text_size(TextSize::Sm))
+                    .font_weight(FontWeight::MEDIUM)
+                    .when(selected.is_some(), |footer| {
+                        footer.child(div().flex_none().w(check))
+                    })
+                    .children(columns.iter().enumerate().map(|(col, column)| {
+                        let shown = column.aggregate.map(|how| {
+                            let shares = rows
+                                .first()
+                                .is_some_and(|row| matches!(row.cells[col], Cell::Progress(_)));
+                            let value =
+                                figure(&rows, &order, col, how).map_or("—".to_string(), |value| {
+                                    match how {
+                                        Aggregate::Count => format!("{}", value as usize),
+                                        _ if shares => format::percent(value, 0, false),
+                                        _ => column.reads(value),
+                                    }
+                                });
+                            div()
+                                .flex()
+                                .items_baseline()
+                                .gap_1()
+                                .child(
+                                    div()
+                                        .text_size(theme.text_size(TextSize::Xs))
+                                        .text_color(colors.fg_subtle)
+                                        .child(how.label()),
+                                )
+                                .child(value)
+                        });
+                        sized(div().px_3().flex().items_center(), column).children(shown)
+                    }))
+            });
+        let body = Body {
+            id: id.clone(),
+            columns: columns.clone(),
+            rows,
+            keys,
+            shown: Rc::new(shown),
+            offset,
+            selected,
+            select,
+            ranges,
+            height,
+            check,
+        };
+        let rows: AnyElement = if total == 0 {
+            div()
+                .flex()
+                .justify_center()
+                .py_6()
+                .text_size(theme.text_size(TextSize::Sm))
+                .text_color(colors.fg_subtle)
+                .child("Nothing matches.")
+                .into_any_element()
+        } else if self.virtualized {
+            let count = body.shown.len();
+            uniform_list((id.clone(), "rows"), count, move |range, _, cx| {
+                range.map(|at| body.row(at, cx)).collect()
+            })
+            .track_scroll(scroll)
+            .flex_1()
+            .min_h_0()
+            .into_any_element()
+        } else {
+            div()
+                .children((0..body.shown.len()).map(|at| body.row(at, cx)))
+                .into_any_element()
+        };
+        let pager = pages.filter(|pages| *pages > 1).map(|pages| {
+            let size = self.page_size.expect("pages come from a page size");
+            let (first, last) = (page_at * size + 1, ((page_at + 1) * size).min(total));
+            let (view, id) = (view.clone(), id.clone());
+            div()
+                .flex()
+                .items_center()
+                .justify_between()
+                .pt_3()
+                .child(Caption::new(format!("{first}–{last} of {total}")))
+                .child(
+                    Pagination::new((id.clone(), "pages"), page_at + 1, pages).on_change(
+                        move |page, _, cx| {
+                            view.update(cx, |view, cx| {
+                                view.page = page - 1;
+                                log::info!("data table {id:?}: page {page}");
+                                cx.notify();
+                            })
+                        },
+                    ),
+                )
+        });
+        self.base
+            .flex()
+            .flex_col()
+            .child(header)
+            .child(rows)
+            .children(figures)
+            .children(pager)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::next_sort;
+
+    #[test]
+    fn a_header_sorts_rising_then_falling_then_not() {
+        assert_eq!(next_sort(None, 2), Some((2, true)));
+        assert_eq!(next_sort(Some((2, true)), 2), Some((2, false)));
+        assert_eq!(next_sort(Some((2, false)), 2), None);
+        assert_eq!(next_sort(Some((1, false)), 2), Some((2, true)));
+    }
+}
diff --git a/src/tables/tests.rs b/src/tables/tests.rs
new file mode 100644
index 0000000..e80ee25
--- /dev/null
+++ b/src/tables/tests.rs
@@ -0,0 +1,69 @@
+use std::{cell::RefCell, rc::Rc};
+
+use gpui::{
+    Context, IntoElement, Modifiers, Render, SharedString, Styled, TestAppContext,
+    VisualTestContext, Window, point, px,
+};
+
+use super::{Column, DataTable, Row};
+use crate::theme::Theme;
+
+/// Five selectable rows, 36 tall under a 36 tall header; it keeps what the table reports.
+struct Picks(Rc<RefCell<Vec<SharedString>>>);
+
+impl Render for Picks {
+    fn render(&mut self, _: &mut Window, _: &mut Context<Self>) -> impl IntoElement {
+        let (now, store) = (self.0.borrow().clone(), self.0.clone());
+        DataTable::new("picks", [Column::new("name", "Name")])
+            .rows(
+                (0..5)
+                    .map(|ix| Row::new(format!("r{ix}"), [format!("Row {ix}").into()]))
+                    .collect::<Vec<_>>(),
+            )
+            .selected(now)
+            .on_select(move |keys, _, _| *store.borrow_mut() = keys.to_vec())
+            .w(px(400.0))
+    }
+}
+
+fn settle(cx: &mut VisualTestContext) {
+    cx.run_until_parked();
+    cx.update(|window, _| window.refresh());
+    cx.run_until_parked();
+}
+
+fn picks(seen: &Rc<RefCell<Vec<SharedString>>>) -> Vec<String> {
+    seen.borrow().iter().map(|key| key.to_string()).collect()
+}
+
+#[gpui::test]
+fn boxes_toggle_shift_takes_a_range_and_the_header_takes_all(cx: &mut TestAppContext) {
+    cx.update(Theme::init);
+    let seen = Rc::new(RefCell::new(Vec::new()));
+    let store = seen.clone();
+    let (_, cx) = cx.add_window_view(|_, _| Picks(store));
+    settle(cx);
+    let row = |ix: usize, x: f32| point(px(x), px(54.0 + 36.0 * ix as f32));
+    cx.simulate_click(row(0, 14.0), Modifiers::none());
+    settle(cx);
+    assert_eq!(picks(&seen), ["r0"]);
+    cx.simulate_click(
+        row(3, 200.0),
+        Modifiers {
+            shift: true,
+            ..Modifiers::none()
+        },
+    );
+    settle(cx);
+    assert_eq!(picks(&seen), ["r0", "r1", "r2", "r3"]);
+    cx.simulate_click(point(px(14.0), px(18.0)), Modifiers::none());
+    settle(cx);
+    assert_eq!(
+        picks(&seen),
+        ["r0", "r1", "r2", "r3", "r4"],
+        "a mixed header box takes all"
+    );
+    cx.simulate_click(point(px(14.0), px(18.0)), Modifiers::none());
+    settle(cx);
+    assert!(picks(&seen).is_empty(), "a full one clears");
+}
diff --git a/src/theme/tokens.rs b/src/theme/tokens.rs
index 067404c..3fbf26c 100644
--- a/src/theme/tokens.rs
+++ b/src/theme/tokens.rs
@@ -284,6 +284,20 @@ impl Theme {
         px_to_rems(128.0)
     }
 
+    /// A table row's height at each density.
+    pub fn table_row(&self, density: Density) -> Rems {
+        px_to_rems(match density {
+            Density::Compact => 28.0,
+            Density::Standard => 36.0,
+            Density::Comfortable => 44.0,
+        })
+    }
+
+    /// A sparkline beside text.
+    pub fn spark_size(&self) -> Size<Rems> {
+        size(px_to_rems(64.0), px_to_rems(18.0))
+    }
+
     /// How far each level of a tree steps in.
     pub fn tree_indent(&self) -> Rems {
         px_to_rems(16.0)
diff --git a/tasks/ch11-20.md b/tasks/ch11-20.md
index 01b5152..f99ccf4 100644
--- a/tasks/ch11-20.md
+++ b/tasks/ch11-20.md
@@ -116,32 +116,38 @@
 - [x] Menu List → `menus::Menu`
 - [x] Transfer List → `forms::TransferList`
 
-## T14 Tables — `src/tables`
+## T14a Tables · Core — `src/tables`
+
+- [x] Table → `tables::Table`
+- [x] DataTable — sort, filter, page, select → `tables::DataTable`
+- [x] VirtualTable → `tables::DataTable`, `virtualized`
+- [x] CellRenderer → `tables::Cell`: text, number, tag, progress, sparkline, person, link
+- [x] RowSelection → `tables::DataTable`, `selected`
+- [x] TableDensity → `tables::DataTable`, `density`
+- [x] AggregationFooter → `tables::Column`, `aggregate`
+- [x] ConditionalFormatting → `tables::Column`, `scale`
+- [x] HeatmapTable → `tables::HeatmapTable`
+- [x] ComparisonTable → `data_display::Comparison`
+
+## T14b Tables · Columns & rows
 
-- [ ] Table
-- [ ] DataTable — sort, filter, page, select
-- [ ] VirtualTable → `tables::DataTable`
-- [ ] DataGrid
-- [ ] Spreadsheet — formula subset, merge, freeze, fill handle
-- [ ] TreeTable
-- [ ] PivotTable
 - [ ] ColumnResizer
 - [ ] ColumnReorder
 - [ ] ColumnVisibility
 - [ ] ColumnPinning
-- [ ] RowSelection
 - [ ] RowExpansion
 - [ ] RowGrouping
 - [ ] InlineRowEdit
-- [ ] CellRenderer
 - [ ] TableToolbar
 - [ ] FilterBuilder
 - [ ] SortBuilder
-- [ ] AggregationFooter
-- [ ] TableDensity
-- [ ] ConditionalFormatting
-- [ ] HeatmapTable
-- [ ] ComparisonTable
+
+## T14c Tables · Grids
+
+- [ ] DataGrid
+- [ ] Spreadsheet — formula subset, merge, freeze, fill handle
+- [ ] TreeTable
+- [ ] PivotTable
 
 ## T15 Charts — `src/charts`
 
@@ -166,7 +172,7 @@
 - [ ] NetworkGraph / ForceGraph
 - [ ] ChordDiagram
 - [ ] ParallelCoordinates
-- [ ] Sparkline / SparkBar / SparkArea
+- [x] Sparkline / SparkBar / SparkArea → `data_display::Sparkline`, landed with T14a for table cells
 - [ ] Bullet Chart
 - [ ] ProgressChart
 - [ ] RealtimeChart