FYI, you mentioned @[email protected] on mastodon which is actually an English speaking community on Lemmy. This created a new discussion post here on Lemmy which propably wasn’t what you intended to do. In the future, please look at the account description before mentioning it.

The error message is very detailed and there is nothing to add to it.

If you want to install an application/CLI tool, use pipx or your system package manager. If you want to install a library, use a virtual environment (e.g. by using python -m venv) or your system package manager.

I think you understood their comment wrong. In your code (e.g. label.add_css_class("green");) you don’t use a dot, but in the CSS stylesheet. It works the same as with HTML/JS/CSS.

Well, that’s CSS :D

Note that if you create a custom Widget class, you can set a CSS name, wich isn’t a CSS class and doesn’t use a leading dot.

Just use label.add_css_class(), label.remove_css_class() or label.set_css_classes() and make sure to properly load your CSS style sheets, this is usually done by including them as a resource alongside .ui files and icons. If you are using libadwaita, you can also use its predefined style classes.

#!/usr/bin/env -S cargo +nightly -Zscript
---
[dependencies]
gtk = { package = "gtk4", version = "0.9.3", features = ["v4_12"] }
---

use gtk::{glib, prelude::*};

const STYLESHEET: &str = r#"
.green {
    color: green;
}
.red {
    color: red;
}
"#;

fn main() -> glib::ExitCode {
    let app = gtk::Application::builder()
        .application_id("org.example.HelloWorld")
        .build();

    app.connect_activate(|app| {
        let window = gtk::ApplicationWindow::builder()
            .application(app)
            .title("Hello, World!")
            .build();

        // Stylesheets are usually bundled with application resources
        // and automatically loaded
        let css_provider = gtk::CssProvider::new();
        css_provider.load_from_string(STYLESHEET);
        gtk::style_context_add_provider_for_display(
            &RootExt::display(&window),
            &css_provider,
            0
        );

        let box_ = gtk::Box::new(gtk::Orientation::Vertical, 6);

        let label = gtk::Label::builder()
            .label("Hello, World")
            .css_classes(["green"].as_slice())
            .build();
        box_.append(&label);


        let button = gtk::Button::builder()
            .label("Toggle Color")
            .build();
        box_.append(&button);

        button.connect_clicked(glib::clone!(#[weak] label, move |_| {
            if label.has_css_class("red") {
                label.add_css_class("green");
                label.remove_css_class("red");
            } else {
                label.add_css_class("red");
                label.remove_css_class("green");
            }
        }));

        window.set_child(Some(&box_));
        window.present();
    });

    app.run()
}

I wonder how they turn the lantern off using a button.

SPRIND GmbH is also known as „Bundesagentur für Sprunginnovationen“ and owned by the Federal Republic of Germany. See https://de.wikipedia.org/wiki/Bundesagentur_für_Sprunginnovationen and https://www.sprind.org

They even implemented it in Firefox: moz://a redirects to https://www.mozilla.org/en-US/about/manifesto/

I think Germany’s done it twice now.

It was Munich and they switched back to Windows after M$ moved their German headquarters to Munich.

You may be interested in lazy-regex.

Time to cargo rm once_cell!

Declaring the use without a paid license as “Unlicensed” is very misleading since the project is also licensed under the GNU AGPL v3.0.

tenacity

You can adjust ownership and permissions for /mnt/something using chown and chmod.

I have no idea when I last updated my RasPi 0s (none of which is exposed to the public).

The “Save” button uses the accent color which is blue by default. With configurable accent colors coming to GNOME 47 and GTK/Libadwaita, you can choose a red accent color.

See the original description of the screenshot:

It’s now using standard button styles, fixing the long-standing issue where suggested and destructive buttons would look the same when using red accent color

./configure && make && sudo make install is not the future