implement loading widget

src/app/browser/window/tab/item/page/content.rs

@@ -48,6 +48,14 @@ impl Content {
         self.gobject.append(status_default.gobject());
     }
 
+    pub fn set_status_loading(&self, title: Option<&str>, description: Option<&str>) {
+        self.clean();
+
+        let status_default = Status::new_loading(title, description);
+
+        self.gobject.append(status_default.gobject());
+    }
+
     pub fn set_text_gemini(&self, base: &Uri, data: &str) -> Option<GString> {
         self.clean();
 

src/app/browser/window/tab/item/page/content/status/loading.rs

@@ -0,0 +1,20 @@
+mod widget;
+use widget::Widget;
+
+use adw::StatusPage;
+
+pub struct Loading {
+    widget: Widget,
+}
+
+impl Loading {
+    pub fn new(title: Option<&str>, description: Option<&str>) -> Self {
+        Self {
+            widget: Widget::new(title, description),
+        }
+    }
+
+    pub fn gobject(&self) -> &StatusPage {
+        &self.widget.gobject()
+    }
+}

src/app/browser/window/tab/item/page/content/status/loading/widget.rs

@@ -0,0 +1,33 @@
+use adw::{Spinner, StatusPage};
+
+/// 16-64 (px)
+const SPINNER_SIZE: i32 = 64;
+
+pub struct Widget {
+    gobject: StatusPage,
+}
+
+impl Widget {
+    pub fn new(title: Option<&str>, description: Option<&str>) -> Self {
+        let gobject = StatusPage::builder()
+            .child(
+                &Spinner::builder()
+                    .width_request(SPINNER_SIZE)
+                    .height_request(SPINNER_SIZE)
+                    .build(),
+            )
+            .build();
+
+        if let Some(value) = title {
+            gobject.set_title(value);
+        }
+
+        gobject.set_description(description);
+
+        Self { gobject }
+    }
+
+    pub fn gobject(&self) -> &StatusPage {
+        &self.gobject
+    }
+}