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table_demo.rs
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table_demo.rs
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#[derive(PartialEq)]
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
enum DemoType {
Manual,
ManyHomogenous,
ManyHeterogenous,
}
/// Shows off a table with dynamic layout
#[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
pub struct TableDemo {
demo: DemoType,
resizable: bool,
num_rows: usize,
}
impl Default for TableDemo {
fn default() -> Self {
Self {
demo: DemoType::Manual,
resizable: true,
num_rows: 10_000,
}
}
}
impl super::Demo for TableDemo {
fn name(&self) -> &'static str {
"☰ Table Demo"
}
fn show(&mut self, ctx: &egui::Context, open: &mut bool) {
egui::Window::new(self.name())
.open(open)
.resizable(true)
.default_width(400.0)
.show(ctx, |ui| {
use super::View as _;
self.ui(ui);
});
}
}
impl super::View for TableDemo {
fn ui(&mut self, ui: &mut egui::Ui) {
ui.vertical(|ui| {
ui.checkbox(&mut self.resizable, "Resizable columns");
ui.label("Table type:");
ui.radio_value(&mut self.demo, DemoType::Manual, "Few, manual rows");
ui.radio_value(
&mut self.demo,
DemoType::ManyHomogenous,
"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"),
);
}
});
ui.separator();
// Leave room for the source code link after the table demo:
use egui_extras::{Size, StripBuilder};
StripBuilder::new(ui)
.size(Size::remainder()) // for the table
.size(Size::exact(10.0)) // for the source code link
.vertical(|mut strip| {
strip.cell(|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::{Size, TableBuilder};
let text_height = egui::TextStyle::Body.resolve(ui.style()).size;
TableBuilder::new(ui)
.striped(true)
.cell_layout(egui::Layout::left_to_right(egui::Align::Center))
.column(Size::initial(60.0).at_least(40.0))
.column(Size::initial(60.0).at_least(40.0))
.column(Size::remainder().at_least(60.0))
.resizable(self.resizable)
.header(20.0, |mut header| {
header.col(|ui| {
ui.heading("Row");
});
header.col(|ui| {
ui.heading("Clock");
});
header.col(|ui| {
ui.heading("Content");
});
})
.body(|mut body| match self.demo {
DemoType::Manual => {
for row_index in 0..20 {
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.col(|ui| {
ui.label(row_index.to_string());
});
row.col(|ui| {
ui.label(clock_emoji(row_index));
});
row.col(|ui| {
ui.style_mut().wrap = Some(false);
if is_thick {
ui.heading("Extra thick row");
} else {
ui.label("Normal row");
}
});
});
}
}
DemoType::ManyHomogenous => {
body.rows(text_height, self.num_rows, |row_index, mut row| {
row.col(|ui| {
ui.label(row_index.to_string());
});
row.col(|ui| {
ui.label(clock_emoji(row_index));
});
row.col(|ui| {
ui.add(
egui::Label::new("Thousands of rows of even height").wrap(false),
);
});
});
}
DemoType::ManyHeterogenous => {
fn row_thickness(row_index: usize) -> f32 {
if thick_row(row_index) {
30.0
} else {
18.0
}
}
body.heterogeneous_rows(
(0..self.num_rows).into_iter().map(row_thickness),
|row_index, mut row| {
row.col(|ui| {
ui.centered_and_justified(|ui| {
ui.label(row_index.to_string());
});
});
row.col(|ui| {
ui.centered_and_justified(|ui| {
ui.label(clock_emoji(row_index));
});
});
row.col(|ui| {
ui.centered_and_justified(|ui| {
ui.style_mut().wrap = Some(false);
if thick_row(row_index) {
ui.heading("Extra thick row");
} else {
ui.label("Normal row");
}
});
});
},
);
}
});
}
}
fn clock_emoji(row_index: usize) -> String {
char::from_u32(0x1f550 + row_index as u32 % 24)
.unwrap()
.to_string()
}
fn thick_row(row_index: usize) -> bool {
row_index % 6 == 0
}