change to hook api

examples/window_focus.rs

@@ -0,0 +1,42 @@
+use dioxus::prelude::*;
+use dioxus_desktop::tao::event::WindowEvent;
+use dioxus_desktop::use_wry_event_handler;
+use dioxus_desktop::wry::application::event::Event as WryEvent;
+
+fn main() {
+    dioxus_desktop::launch(app);
+}
+
+fn app(cx: Scope) -> Element {
+    let focused = use_state(cx, || false);
+
+    use_wry_event_handler(cx, {
+        to_owned![focused];
+        move |event, _| {
+            if let WryEvent::WindowEvent {
+                event: WindowEvent::Focused(new_focused),
+                ..
+            } = event
+            {
+                focused.set(*new_focused);
+            }
+        }
+    });
+
+    cx.render(rsx! {
+        div{
+            width: "100%",
+            height: "100%",
+            display: "flex",
+            flex_direction: "column",
+            align_items: "center",
+            {
+                if *focused.get() {
+                    "This window is focused!"
+                } else {
+                    "This window is not focused!"
+                }
+            }
+        }
+    })
+}