88 lines
3.5 KiB
Rust
88 lines
3.5 KiB
Rust
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//! Fixed row geometry for dense live tables. Children cannot resize a row or
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//! paint into its neighbours; the enclosing scroll area owns overflow.
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use eframe::egui;
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pub(crate) const GAP: f32 = 10.0;
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pub(crate) fn row(
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ui: &mut egui::Ui,
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id: impl std::hash::Hash,
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widths: &[f32],
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stripe: bool,
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mut cell: impl FnMut(usize, &mut egui::Ui),
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) {
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let font = egui::FontSelection::Default.resolve(ui.style());
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let text_height = ui.fonts(|fonts| fonts.row_height(&font));
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let height = ui.spacing().interact_size.y.max(text_height) + 10.0;
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let width = widths.iter().sum::<f32>() + GAP * widths.len().saturating_sub(1) as f32;
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let (rect, _) = ui.allocate_exact_size(egui::vec2(width, height), egui::Sense::hover());
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if stripe {
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ui.painter()
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.rect_filled(rect, 2.0, ui.visuals().faint_bg_color);
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}
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let mut x = rect.left();
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for (column, width) in widths.iter().enumerate() {
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let bounds = egui::Rect::from_min_size(
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egui::pos2(x, rect.top() + 3.0),
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egui::vec2(*width, height - 6.0),
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);
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let mut child = ui.new_child(
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egui::UiBuilder::new()
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.id_salt((&id, column))
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.max_rect(bounds)
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.layout(egui::Layout::left_to_right(egui::Align::Center)),
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);
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child.set_clip_rect(ui.clip_rect().intersect(bounds));
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child.style_mut().wrap_mode = Some(egui::TextWrapMode::Truncate);
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cell(column, &mut child);
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x += width + GAP;
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}
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}
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#[cfg(test)]
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mod tests {
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#![allow(clippy::unwrap_used, clippy::expect_used, clippy::panic)]
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use super::*;
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#[test]
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fn oversized_content_is_clipped_to_its_cell_at_every_scale() {
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for size in [13.0, 20.0, 28.0] {
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let ctx = egui::Context::default();
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ctx.style_mut(|style| {
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style.override_font_id = Some(egui::FontId::proportional(size));
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});
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let output = ctx.run(egui::RawInput::default(), |ctx| {
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egui::CentralPanel::default().show(ctx, |ui| {
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for index in 0..4 {
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row(ui, index, &[90.0, 120.0], index % 2 == 0, |column, ui| {
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if column == 0 {
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ui.horizontal(|ui| {
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ui.label("very long device name that cannot fit");
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ui.button("Forget").on_hover_text("Forget");
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});
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} else {
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ui.label(format!("row {index}"));
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}
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});
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}
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});
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});
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let mut previous_bottom = 0.0;
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for index in 0..4 {
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let shape = output.shapes.iter().find(|shape| matches!(&shape.shape, egui::Shape::Text(t) if t.galley.text() == format!("row {index}"))).unwrap();
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let egui::Shape::Text(text) = &shape.shape else {
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unreachable!()
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};
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assert!(text.visual_bounding_rect().top() >= previous_bottom);
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assert!(
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shape.clip_rect.contains_rect(text.visual_bounding_rect()),
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"font {size}: clip {:?}, text {:?}",
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shape.clip_rect,
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text.visual_bounding_rect()
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);
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assert!(shape.clip_rect.left() >= 108.0);
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previous_bottom = shape.clip_rect.bottom();
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}
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}
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}
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}
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