58 lines
1.8 KiB
Rust
58 lines
1.8 KiB
Rust
//! Up/down arrow scroll indicators for bounded lists.
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use ratatui::layout::Rect;
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use ratatui::style::{Color, Style};
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use ratatui::widgets::Paragraph;
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use ratatui::Frame;
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/// Horizontal alignment for scroll indicators.
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pub enum IndicatorAlign {
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Center,
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Right,
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}
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/// Render up/down scroll arrows when content overflows.
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pub fn render_scroll_indicators(
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frame: &mut Frame,
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area: Rect,
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offset: usize,
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visible: usize,
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total: usize,
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color: Color,
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align: IndicatorAlign,
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) {
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let style = Style::new().fg(color);
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match align {
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IndicatorAlign::Center => {
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if offset > 0 {
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let indicator = Paragraph::new("▲")
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.style(style)
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.alignment(ratatui::layout::Alignment::Center);
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frame.render_widget(indicator, Rect { height: 1, ..area });
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}
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if offset + visible < total {
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let y = area.y + area.height.saturating_sub(1);
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let indicator = Paragraph::new("▼")
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.style(style)
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.alignment(ratatui::layout::Alignment::Center);
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frame.render_widget(indicator, Rect { y, height: 1, ..area });
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}
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}
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IndicatorAlign::Right => {
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let x = area.x + area.width.saturating_sub(1);
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if offset > 0 {
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let indicator = Paragraph::new("▲").style(style);
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frame.render_widget(indicator, Rect::new(x, area.y, 1, 1));
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}
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if offset + visible < total {
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let indicator = Paragraph::new("▼").style(style);
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frame.render_widget(
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indicator,
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Rect::new(x, area.y + area.height.saturating_sub(1), 1, 1),
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);
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}
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}
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}
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}
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