Function scrollbar_visibility_alpha

src/engine.rs:877–892

(config: ScrollbarConfig, idle_frames: u32)

}

fn scrollbar_visibility_alpha(config: ScrollbarConfig, idle_frames: u32) -> f32 {
    match config.hide_after_frames {
        None => 1.0,
        Some(hide) => {
            if hide == 0 {
                return 0.0;
            }
            if idle_frames <= hide {
                return 1.0;
            }
            let fade_frames = ((hide as f32) * 0.25).ceil().max(1.0) as u32;
            let fade_progress = (idle_frames - hide) as f32 / fade_frames as f32;
            (1.0 - fade_progress).clamp(0.0, 1.0)
        }
    }
}

fn apply_alpha(color: Color, alpha_mul: f32) -> Color {
    Color::rgba(