fix: get is_focused value dynamically

examples/focused_window.rs

@@ -0,0 +1,25 @@
+use std::thread;
+use xcap::Window;
+
+fn main() {
+    thread::sleep(std::time::Duration::from_secs(3));
+
+    loop {
+        let windows = Window::all().unwrap();
+
+        windows.iter().filter(|w| w.is_focused()).for_each(|focused| {
+            println!(
+                "Focused Window:\n id: {}\n title: {}\n app_name: {}\n monitor: {:?}\n position: {:?}\n size {:?}\n state {:?}\n",
+                focused.id(),
+                focused.title(),
+                focused.app_name(),
+                focused.current_monitor().name(),
+                (focused.x(), focused.y(), focused.z()),
+                (focused.width(), focused.height()),
+                (focused.is_minimized(), focused.is_maximized(), focused.is_focused())
+            );
+        });
+
+        thread::sleep(std::time::Duration::from_secs(1));
+    }
+}

src/macos/impl_window.rs

@@ -11,6 +11,7 @@ use objc2_core_graphics::{
     CGDisplayBounds, CGMainDisplayID, CGRectContainsPoint, CGRectIntersectsRect,
     CGRectMakeWithDictionaryRepresentation, CGWindowListCopyWindowInfo, CGWindowListOption,
 };
+use objc2_foundation::{NSNumber, NSString};
 
 use crate::{error::XCapResult, XCapError};
 
@@ -177,9 +178,12 @@ impl ImplWindow {
         unsafe {
             let impl_monitors = ImplMonitor::all()?;
             let workspace = NSWorkspace::sharedWorkspace();
+            let pid_key = NSString::from_str("NSApplicationProcessIdentifier");
             let focused_app_pid = workspace
-                .frontmostApplication()
-                .map(|focused_app| focused_app.processIdentifier());
+                .activeApplication()
+                .and_then(|dictionary| dictionary.valueForKey(&pid_key))
+                .and_then(|pid| pid.downcast::<NSNumber>().ok())
+                .map(|pid| pid.intValue());
 
             let mut impl_windows = Vec::new();