Initial import. Most things seem working.

This includes an abortive attempt to do a gtk4 dialog (which I don't
think is possible, as gtk4 doesn't allow embedding toplevels anymore),
and an iced dialog, which I just never started writing.

dialog-gtk4/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "bscreensaver-dialog-gtk4"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+gtk = { version = "0.4", package = "gtk4", features = ["v4_6"]}
+gdk-x11 = { version = "0.4", package = "gdk4-x11", features = ["v4_4", "xlib"]}
+x11 = "2.19"

dialog-gtk4/src/main.rs

@@ -0,0 +1,43 @@
+use gdk_x11::{X11Surface, X11Display};
+use gtk::{prelude::*, Application, ApplicationWindow, Label};
+use std::process::exit;
+
+fn main() {
+    let app = Application::builder()
+        .application_id("org.spurint.bscreensaver.dialog-gtk4")
+        .build();
+    app.connect_activate(build_ui);
+
+    app.run();
+}
+
+fn build_ui(app: &Application) {
+    let titlebar = Label::builder()
+        .label("Unlock Screen")
+        .halign(gtk::Align::Center)
+        .single_line_mode(true)
+        .build();
+    titlebar.show();
+
+    let window = ApplicationWindow::builder()
+        .application(app)
+        .titlebar(&titlebar)
+        .modal(true)
+        .decorated(false)
+        .build();
+    window.realize();
+
+    let surface = unsafe { window.surface().unsafe_cast::<X11Surface>() };
+    let xid = surface.xid();
+    if xid == 0 {
+        eprintln!("Lock dialog has no XID");
+        exit(1);
+    }
+    println!("{}", surface.xid());
+
+    let mut buf = String::new();
+    let stdin = std::io::stdin();
+    stdin.read_line(&mut buf).unwrap();
+
+    window.present();
+}