use canonical module subfolder tree

src/browser/header/subject/description/mod.rs

@@ -0,0 +1,27 @@
+use gtk::prelude::WidgetExt;
+use gtk::Label;
+
+pub fn new() -> Label {
+    let description = Label::builder()
+        .css_classes(["subtitle"])
+        .single_line_mode(true)
+        .ellipsize(gtk::pango::EllipsizeMode::End)
+        .build();
+
+    update(
+        &description,
+        "", // @TODO
+    );
+
+    description
+}
+
+pub fn update(description: &Label, text: &str) {
+    description.set_text(text);
+
+    if text.is_empty() {
+        description.hide();
+    } else {
+        description.show();
+    }
+}

src/browser/header/subject/mod.rs

@@ -0,0 +1,20 @@
+mod description;
+mod title;
+
+use gtk::prelude::BoxExt;
+use gtk::Box;
+
+pub fn new() -> Box {
+    let subject = Box::builder()
+        // Tuneup
+        .orientation(gtk::Orientation::Vertical)
+        .valign(gtk::Align::Center)
+        .build();
+
+    // Compose childs
+    subject.append(&title::new());
+    subject.append(&description::new());
+
+    // Done
+    subject
+}

src/browser/header/subject/title/mod.rs

@@ -0,0 +1,23 @@
+use gtk::Label;
+
+pub fn new() -> Label {
+    let title = Label::builder()
+        .css_classes(["title"])
+        .single_line_mode(true)
+        .ellipsize(gtk::pango::EllipsizeMode::End)
+        .build();
+
+    update(&title, "Welcome");
+
+    return title;
+}
+
+pub fn update(title: &Label, text: &str) {
+    let default_text = "Yoda"; // @TODO
+
+    if text.is_empty() {
+        title.set_text(default_text);
+    } else {
+        title.set_text(&format!("{} - {}", text, default_text));
+    }
+}