implement about dialog

src/app/browser/about.rs

@@ -0,0 +1,41 @@
+use adw::{prelude::AdwDialogExt, AboutDialog};
+use gtk::{prelude::IsA, License};
+
+pub struct About {
+    gobject: AboutDialog,
+}
+
+impl About {
+    // Construct
+    pub fn new() -> Self {
+        // Collect debug info
+        let debug = &[
+            format!(
+                "GTK {}.{}.{}",
+                gtk::major_version(),
+                gtk::minor_version(),
+                gtk::micro_version()
+            ),
+            format!("SQLite {}", sqlite::version()),
+            // @TODO
+        ];
+
+        // Init gobject
+        let gobject = AboutDialog::builder()
+            .application_name(env!("CARGO_PKG_NAME"))
+            .debug_info(debug.join("\n"))
+            .developer_name(env!("CARGO_PKG_DESCRIPTION"))
+            .issue_url(env!("CARGO_PKG_REPOSITORY"))
+            .license_type(License::MitX11)
+            .version(env!("CARGO_PKG_VERSION"))
+            .build();
+
+        // Return new struct
+        Self { gobject }
+    }
+
+    // Actions
+    pub fn present(&self, parent: Option<&impl IsA<gtk::Widget>>) {
+        self.gobject.present(parent);
+    }
+}