100 lines
3.0 KiB
Rust
100 lines
3.0 KiB
Rust
use eframe::egui;
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fn format_line_number(line_number: usize, line_side: bool, line_count_width: usize) -> String {
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if line_side {
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// Right side: left-align with trailing space for scrollbar clearance
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format!("{:<width$} ", line_number, width = line_count_width)
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} else {
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// Left side: right-align, no trailing space (separator provides gap)
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format!("{:>width$}", line_number, width = line_count_width)
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}
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}
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pub(super) fn calculate_visual_line_mapping(
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ui: &egui::Ui,
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content: &str,
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available_width: f32,
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font_id: egui::FontId,
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) -> Vec<Option<usize>> {
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let mut visual_lines = Vec::new();
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for (line_num, line) in content.lines().enumerate() {
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if line.is_empty() {
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visual_lines.push(Some(line_num + 1));
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continue;
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}
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let galley = ui.fonts_mut(|fonts| {
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fonts.layout(
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line.to_string(),
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font_id.to_owned(),
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egui::Color32::WHITE,
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available_width,
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)
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});
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let wrapped_line_count = galley.rows.len().max(1);
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visual_lines.push(Some(line_num + 1));
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for _ in 1..wrapped_line_count {
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visual_lines.push(None);
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}
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}
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if content.ends_with('\n') && !content.is_empty() {
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let line_num = content.lines().count();
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visual_lines.push(Some(line_num + 1));
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}
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visual_lines
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}
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pub(super) fn render_line_numbers(
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ui: &mut egui::Ui,
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line_count: usize,
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visual_line_mapping: &[Option<usize>],
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line_number_width: f32,
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word_wrap: bool,
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line_side: bool,
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font_size: f32,
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) {
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ui.vertical(|ui| {
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ui.disable();
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ui.set_width(line_number_width);
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ui.spacing_mut().item_spacing.y = 0.0;
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ui.add_space(1.0); // Text Editor default top margin
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let text_color = ui.visuals().weak_text_color();
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let bg_color = ui.visuals().extreme_bg_color;
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let line_numbers_rect = ui.available_rect_before_wrap();
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ui.painter().rect_filled(line_numbers_rect, 0.0, bg_color);
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let font_id = egui::FontId::monospace(font_size);
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let line_count_width = line_count.to_string().len();
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let line_texts = if word_wrap {
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visual_line_mapping
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.into_iter()
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.map(|line_number_opt| {
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line_number_opt.map_or_else(
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|| " ".repeat(line_count_width),
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|line_number| format_line_number(line_number, line_side, line_count_width),
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)
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})
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.collect::<Vec<_>>()
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} else {
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(1..=line_count)
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.map(|i| format_line_number(i, line_side, line_count_width))
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.collect::<Vec<_>>()
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};
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for text in line_texts {
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ui.label(
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egui::RichText::new(text)
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.font(font_id.to_owned())
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.color(text_color),
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);
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}
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});
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}
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