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table_demo.rs
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table_demo.rs
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use egui::{TextStyle, TextWrapMode};
#[derive(PartialEq)]
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
enum DemoType {
Manual,
ManyHomogeneous,
ManyHeterogenous,
}
/// Shows off a table with dynamic layout
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
pub struct TableDemo {
demo: DemoType,
striped: bool,
resizable: bool,
clickable: bool,
num_rows: usize,
scroll_to_row_slider: usize,
scroll_to_row: Option<usize>,
selection: std::collections::HashSet<usize>,
checked: bool,
}
impl Default for TableDemo {
fn default() -> Self {
Self {
demo: DemoType::Manual,
striped: true,
resizable: true,
clickable: true,
num_rows: 10_000,
scroll_to_row_slider: 0,
scroll_to_row: None,
selection: Default::default(),
checked: false,
}
}
}
impl super::Demo for TableDemo {
fn name(&self) -> &'static str {
"☰ Table"
}
fn show(&mut self, ctx: &egui::Context, open: &mut bool) {
egui::Window::new(self.name())
.open(open)
.default_width(400.0)
.show(ctx, |ui| {
use super::View as _;
self.ui(ui);
});
}
}
const NUM_MANUAL_ROWS: usize = 20;
impl super::View for TableDemo {
fn ui(&mut self, ui: &mut egui::Ui) {
ui.vertical(|ui| {
ui.horizontal(|ui| {
ui.checkbox(&mut self.striped, "Striped");
ui.checkbox(&mut self.resizable, "Resizable columns");
ui.checkbox(&mut self.clickable, "Clickable rows");
});
ui.label("Table type:");
ui.radio_value(&mut self.demo, DemoType::Manual, "Few, manual rows");
ui.radio_value(
&mut self.demo,
DemoType::ManyHomogeneous,
"Thousands of rows of same height",
);
ui.radio_value(
&mut self.demo,
DemoType::ManyHeterogenous,
"Thousands of rows of differing heights",
);
if self.demo != DemoType::Manual {
ui.add(
egui::Slider::new(&mut self.num_rows, 0..=100_000)
.logarithmic(true)
.text("Num rows"),
);
}
{
let max_rows = if self.demo == DemoType::Manual {
NUM_MANUAL_ROWS
} else {
self.num_rows
};
let slider_response = ui.add(
egui::Slider::new(&mut self.scroll_to_row_slider, 0..=max_rows)
.logarithmic(true)
.text("Row to scroll to"),
);
if slider_response.changed() {
self.scroll_to_row = Some(self.scroll_to_row_slider);
}
}
});
ui.separator();
// Leave room for the source code link after the table demo:
let body_text_size = TextStyle::Body.resolve(ui.style()).size;
use egui_extras::{Size, StripBuilder};
StripBuilder::new(ui)
.size(Size::remainder().at_least(100.0)) // for the table
.size(Size::exact(body_text_size)) // for the source code link
.vertical(|mut strip| {
strip.cell(|ui| {
egui::ScrollArea::horizontal().show(ui, |ui| {
self.table_ui(ui);
});
});
strip.cell(|ui| {
ui.vertical_centered(|ui| {
ui.add(crate::egui_github_link_file!());
});
});
});
}
}
impl TableDemo {
fn table_ui(&mut self, ui: &mut egui::Ui) {
use egui_extras::{Column, TableBuilder};
let text_height = egui::TextStyle::Body
.resolve(ui.style())
.size
.max(ui.spacing().interact_size.y);
let available_height = ui.available_height();
let mut table = TableBuilder::new(ui)
.striped(self.striped)
.resizable(self.resizable)
.cell_layout(egui::Layout::left_to_right(egui::Align::Center))
.column(Column::auto())
.column(Column::auto())
.column(Column::initial(100.0).range(40.0..=300.0))
.column(Column::initial(100.0).at_least(40.0).clip(true))
.column(Column::remainder())
.min_scrolled_height(0.0)
.max_scroll_height(available_height);
if self.clickable {
table = table.sense(egui::Sense::click());
}
if let Some(row_index) = self.scroll_to_row.take() {
table = table.scroll_to_row(row_index, None);
}
table
.header(20.0, |mut header| {
header.col(|ui| {
ui.strong("Row");
});
header.col(|ui| {
ui.strong("Interaction");
});
header.col(|ui| {
ui.strong("Expanding content");
});
header.col(|ui| {
ui.strong("Clipped text");
});
header.col(|ui| {
ui.strong("Content");
});
})
.body(|mut body| match self.demo {
DemoType::Manual => {
for row_index in 0..NUM_MANUAL_ROWS {
let is_thick = thick_row(row_index);
let row_height = if is_thick { 30.0 } else { 18.0 };
body.row(row_height, |mut row| {
row.set_selected(self.selection.contains(&row_index));
row.col(|ui| {
ui.label(row_index.to_string());
});
row.col(|ui| {
ui.checkbox(&mut self.checked, "Click me");
});
row.col(|ui| {
expanding_content(ui);
});
row.col(|ui| {
ui.label(long_text(row_index));
});
row.col(|ui| {
ui.style_mut().wrap_mode = Some(egui::TextWrapMode::Extend);
if is_thick {
ui.heading("Extra thick row");
} else {
ui.label("Normal row");
}
});
self.toggle_row_selection(row_index, &row.response());
});
}
}
DemoType::ManyHomogeneous => {
body.rows(text_height, self.num_rows, |mut row| {
let row_index = row.index();
row.set_selected(self.selection.contains(&row_index));
row.col(|ui| {
ui.label(row_index.to_string());
});
row.col(|ui| {
ui.checkbox(&mut self.checked, "Click me");
});
row.col(|ui| {
expanding_content(ui);
});
row.col(|ui| {
ui.label(long_text(row_index));
});
row.col(|ui| {
ui.add(
egui::Label::new("Thousands of rows of even height")
.wrap_mode(TextWrapMode::Extend),
);
});
self.toggle_row_selection(row_index, &row.response());
});
}
DemoType::ManyHeterogenous => {
let row_height = |i: usize| if thick_row(i) { 30.0 } else { 18.0 };
body.heterogeneous_rows((0..self.num_rows).map(row_height), |mut row| {
let row_index = row.index();
row.set_selected(self.selection.contains(&row_index));
row.col(|ui| {
ui.label(row_index.to_string());
});
row.col(|ui| {
ui.checkbox(&mut self.checked, "Click me");
});
row.col(|ui| {
expanding_content(ui);
});
row.col(|ui| {
ui.label(long_text(row_index));
});
row.col(|ui| {
ui.style_mut().wrap_mode = Some(egui::TextWrapMode::Extend);
if thick_row(row_index) {
ui.heading("Extra thick row");
} else {
ui.label("Normal row");
}
});
self.toggle_row_selection(row_index, &row.response());
});
}
});
}
fn toggle_row_selection(&mut self, row_index: usize, row_response: &egui::Response) {
if row_response.clicked() {
if self.selection.contains(&row_index) {
self.selection.remove(&row_index);
} else {
self.selection.insert(row_index);
}
}
}
}
fn expanding_content(ui: &mut egui::Ui) {
let width = ui.available_width().clamp(20.0, 200.0);
let height = ui.available_height();
let (rect, _response) = ui.allocate_exact_size(egui::vec2(width, height), egui::Sense::hover());
ui.painter().hline(
rect.x_range(),
rect.center().y,
(1.0, ui.visuals().text_color()),
);
}
fn long_text(row_index: usize) -> String {
format!("Row {row_index} has some long text that you may want to clip, or it will take up too much horizontal space!")
}
fn thick_row(row_index: usize) -> bool {
row_index % 6 == 0
}