Function progress_indeterminate 

pub fn progress_indeterminate(bar_color: Color) -> El

Indeterminate horizontal loader — same dimensions as progress, but with a small bar of bar_color sliding back and forth across a muted track on a continuous loop. Use this in progress slots where no completion ratio is available (uploading to a server that doesn’t report bytes-sent, parsing a stream of unknown length, etc.). The runtime keeps the host loop ticking automatically while one is in the tree.

use aetna_core::prelude::*;

row([
    text("Uploading…").label(),
    spacer(),
    progress_indeterminate(tokens::PRIMARY)
        .width(Size::Fixed(120.0)),
])