implement show_with_delay option

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

@@ -2,15 +2,20 @@ mod widget;
 use widget::Widget;
 
 use adw::StatusPage;
+use std::time::Duration;
 
 pub struct Loading {
     widget: Widget,
 }
 
 impl Loading {
-    pub fn new(title: Option<&str>, description: Option<&str>) -> Self {
+    pub fn new(
+        title: Option<&str>,
+        description: Option<&str>,
+        show_with_delay: Option<Duration>,
+    ) -> Self {
         Self {
-            widget: Widget::new(title, description),
+            widget: Widget::new(title, description, show_with_delay),
         }
     }
 

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

@@ -1,4 +1,9 @@
 use adw::{Spinner, StatusPage};
+use gtk::{
+    glib::{timeout_add_local, ControlFlow},
+    prelude::WidgetExt,
+};
+use std::time::Duration;
 
 /// 16-64 (px)
 const SPINNER_SIZE: i32 = 64;
@@ -11,7 +16,13 @@ impl Widget {
     // Constructors
 
     /// Create new default widget configuration with options
-    pub fn new(title: Option<&str>, description: Option<&str>) -> Self {
+    ///
+    /// * use `show_with_delay` option on loading not take a while
+    pub fn new(
+        title: Option<&str>,
+        description: Option<&str>,
+        show_with_delay: Option<Duration>,
+    ) -> Self {
         let gobject = StatusPage::builder()
             .child(
                 &Spinner::builder()
@@ -27,6 +38,17 @@ impl Widget {
 
         gobject.set_description(description);
 
+        if let Some(duration) = show_with_delay {
+            gobject.set_visible(false);
+            timeout_add_local(duration, {
+                let this = gobject.clone();
+                move || {
+                    this.set_visible(true);
+                    ControlFlow::Break
+                }
+            });
+        }
+
         Self { gobject }
     }