gala/daemon/MonitorLabel.vala

/*
 * Copyright 2024 elementary, Inc. (https://elementary.io)
 * SPDX-License-Identifier: LGPL-3.0-or-later
 */

 public class Gala.Daemon.MonitorLabel : Hdy.Window {
    private const int SPACING = 12;
    private const string COLORED_STYLE_CSS = """
    .%s {
        background-color: alpha(%s, 0.8);
        color: %s;
    }
    """;

    public MonitorLabelInfo info { get; construct; }

    public MonitorLabel (MonitorLabelInfo info) {
        Object (info: info);
    }

    construct {
        child = new Gtk.Label (info.label);

        title = "LABEL-%i".printf (info.monitor);

        input_shape_combine_region (null);
        accept_focus = false;
        decorated = false;
        resizable = false;
        deletable = false;
        can_focus = false;
        skip_taskbar_hint = true;
        skip_pager_hint = true;
        type_hint = Gdk.WindowTypeHint.TOOLTIP;
        set_keep_above (true);

        stick ();

        var scale_factor = get_style_context ().get_scale ();
        move (
            (int) (info.x / scale_factor) + SPACING,
            (int) (info.y / scale_factor) + SPACING
        );

        var provider = new Gtk.CssProvider ();
        try {
            provider.load_from_data (COLORED_STYLE_CSS.printf (title, info.background_color, info.text_color));
            get_style_context ().add_class (title);
            get_style_context ().add_class ("monitor-label");

            Gtk.StyleContext.add_provider_for_screen (
                Gdk.Screen.get_default (),
                provider,
                Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION
            );
        } catch (Error e) {
            warning ("Failed to load CSS: %s", e.message);
        }

        show_all ();
    }
}