Hoje vamos aprender a como criar um menu suspenso/menu popup usando React Native. Você já deve ter se deparado com aquele menu com três pontinhos no Android.
Precisei implementar esse tipo de componente em um projeto e o React Native não o possui por padrão, mas por sorte há um método em um carinha chamado UIManager.java class que nos permite criar esse componente.
O código deste tutorial segue abaixo:
PopUpMenu
import React, { Component } from "react";
import {
View,
UIManager,
findNodeHandle,
TouchableOpacity,
} from "react-native";
import Icon from "react-native-vector-icons/MaterialIcons";
import PropTypes from "prop-types";
const ICON_SIZE = 24;
export default class PopupMenu extends Component {
static propTypes = {
actions: PropTypes.arrayOf(PropTypes.string).isRequired,
onPress: PropTypes.func.isRequired,
};
constructor(props) {
super(props);
this.state = {
icon: null,
};
}
onError() {
console.log("Popup Error");
}
onPress = () => {
if (this.state.icon) {
UIManager.showPopupMenu(
findNodeHandle(this.state.icon),
this.props.actions,
this.onError,
this.props.onPress
);
}
};
render() {
return (
<View>
<TouchableOpacity onPress={this.onPress}>
<Icon
name="more-vert"
size={ICON_SIZE}
color={"red"}
ref={this.onRef}
/>
</TouchableOpacity>
</View>
);
}
onRef = (icon) => {
if (!this.state.icon) {
this.setState({ icon });
}
};
}
Tela usando o componente PopUpMenu
import React from "react";
import {
SafeAreaView,
StyleSheet,
ScrollView,
View,
Text,
StatusBar,
} from "react-native";
import {
Header,
LearnMoreLinks,
Colors,
DebugInstructions,
ReloadInstructions,
} from "react-native/Libraries/NewAppScreen";
import PopUp from "./src/components/PopUp/index";
const App: () => React$Node = () => {
const onPopupEvent = (eventName, index) => {
if (eventName !== "itemSelected") return;
if (index === 0) console.log("PopUpMenu");
};
return (
<>
<StatusBar barStyle="dark-content" />
<SafeAreaView>
<ScrollView
contentInsetAdjustmentBehavior="automatic"
style={styles.scrollView}
>
<Header />
{global.HermesInternal == null ? null : (
<View style={styles.engine}>
<Text style={styles.footer}>Engine: Hermes</Text>
</View>
)}
<View style={styles.body}>
<View style={styles.sectionContainer}>
<PopUp actions={["PopUpMenu"]} onPress={onPopupEvent} />
</View>
<View style={styles.sectionContainer}>
<Text style={styles.sectionTitle}>See Your Changes</Text>
<Text style={styles.sectionDescription}>
<ReloadInstructions />
</Text>
</View>
<View style={styles.sectionContainer}>
<Text style={styles.sectionTitle}>Debug</Text>
<Text style={styles.sectionDescription}>
<DebugInstructions />
</Text>
</View>
<View style={styles.sectionContainer}>
<Text style={styles.sectionTitle}>Learn More</Text>
<Text style={styles.sectionDescription}>
Read the docs to discover what to do next:
</Text>
</View>
<LearnMoreLinks />
</View>
</ScrollView>
</SafeAreaView>
</>
);
};
const styles = StyleSheet.create({
scrollView: {
backgroundColor: Colors.lighter,
},
engine: {
position: "absolute",
right: 0,
},
body: {
backgroundColor: Colors.white,
},
sectionContainer: {
marginTop: 32,
paddingHorizontal: 24,
},
sectionTitle: {
fontSize: 24,
fontWeight: "600",
color: Colors.black,
},
sectionDescription: {
marginTop: 8,
fontSize: 18,
fontWeight: "400",
color: Colors.dark,
},
highlight: {
fontWeight: "700",
},
footer: {
color: Colors.dark,
fontSize: 12,
fontWeight: "600",
padding: 4,
paddingRight: 12,
textAlign: "right",
},
});
export default App;
É isso. Até a próxima :)
Top comments (0)