Check focus behavior
On Android, you can use an OnFocusChangeListener to listen to focus changes. The onFocusChange) method is called when the element receives focus.
Be careful when using the onFocusChange method: do not trigger any context change because they might confuse users.
kotlin
webView.setOnFocusChangeListener { view, focused ->
if (focused) {
// Do not change context
}
}In Jetpack Compose, you can use the onFocusChanged.onFocusChanged(kotlin.Function1)) modifier to listen for focus changes. It contains a property such, as isFocused), to check if composable currently has focus.
kotlin
Button(
onClick = { /* Your click handling */ },
modifier = Modifier
.onFocusChanged {
if (it.isFocused) {
// logic in case view is focused
}
}
) {
// Button content ...
}On iOS, you can use the UIAccessibilityFocus protocol to listen to focus changes. The accessibilityElementDidBecomeFocused method is called whenever an element receives focus.
Be careful when using the accessibilityElementDidBecomeFocused method: do not trigger any context change because they might confuse users.
swift
class View: UIView {
override open func accessibilityElementDidBecomeFocused() {
// Do not change context
}
}In SwiftUI, you can track when a view becomes focused by using the @AccessibilityFocusState property. This property allows you to bind a focus state to the view. You attach the accessibilityFocused) modifier to the view and link it to the focus state variable. To react to focus changes, utilize the onChange) modifier. This combination enables you to execute custom actions whenever the view gains or loses focus.
swift
// Define a focus state to track which view is focused
@AccessibilityFocusState private var isFocused: Bool
var body: some View {
Text("Appt")
.accessibilityFocused($isFocused) // Apply the focus state to this view
.onChange(of: isFocused) { _, focused in
if focused {
// Handle the view becoming focused
} else {
// Handle the view losing focus
}
}
}In Flutter, you can use FocusNode to listen to focus changes. The flutter_hooks package includes a method named useFocusNode which makes it easier to listen to to focus changes.
Be careful when using the FocusNode listener: do not trigger any context change because they might confuse users.
dart
import 'package:flutter/material.dart';
import 'package:flutter_hooks/flutter_hooks.dart';
class FocusWidget extends HookWidget {
@override
Widget build(BuildContext context) {
final focusNode = useFocusNode();
useEffect(() {
focusNode.addListener(() {
// Do not change context
});
return;
}, [focusNode]);
return TextField(focusNode: focusNode);
}
}In React Native, you can use the onFocus method to listen to focus changes. The method is called when the element receives focus.
Be careful when the onFocus callback: do not trigger any context change because they might confuse users.
jsx
<TextInput onFocus={() => {
// Do not change context
}} />csharp
Not available, contribute!In Xamarin.Forms, you can use the Focused event to listen to focus changes. The method is called when the element receives focus.
Be careful when the Focused callback: do not trigger any context change because they might confuse users.
csharp
Element.Focused += (sender, arguments) => {
// Do not change context
};