[FEATURE] Support for transparent Palette color about cursive

[gyscos]

Hi!

From what I've seen, terminals usually support transparency for the background only.
In these case, you can use the color TerminalDefault, and it'll be match your terminal settings.

I do not know of a way to use transparent colors apart from that, but I'd be interested if you found something!

[aadi58002]

Hi!

From what I've seen, terminals usually support transparency for the background only. In these case, you can use the color TerminalDefault, and it'll be match your terminal settings.

I do not know of a way to use transparent colors apart from that, but I'd be interested if you found something!

Sorry for the late reply
This works as expected

use cursive::views::{Dialog, TextView};

fn main() {
    // Creates the cursive root - required for every application.
    let mut siv = cursive::default();

    siv.set_theme(cursive::theme::Theme{
        palette: cursive::theme::Palette::terminal_default(),
        ..Default::default()
    });
    // Creates a dialog with a single "Quit" button
    siv.add_layer(Dialog::around(TextView::new("Hello Dialog!"))
                         .title("Cursive")
                         .button("Quit", |s| s.quit()));

    // Starts the event loop.
    siv.run();
}