complete widget submodule refactory

src/browser/main/tab/widget.rs

@@ -0,0 +1,30 @@
+pub struct Tab {
+    gtk: gtk::Notebook,
+}
+
+impl Tab {
+    // Construct new object
+    pub fn new() -> Tab {
+        Self {
+            gtk: gtk::Notebook::builder().scrollable(true).build(),
+        }
+    }
+
+    // Actions
+    pub fn append(&self, label: &gtk::Box, page: &gtk::Box, current: bool) -> u32 {
+        let page_number = self.gtk.append_page(page, Some(label));
+
+        self.gtk.set_tab_reorderable(page, true);
+
+        if current {
+            self.gtk.set_current_page(Some(page_number));
+        }
+
+        page_number
+    }
+
+    // Getters
+    pub fn gtk(&self) -> &gtk::Notebook {
+        &self.gtk
+    }
+}