How to emit event to app root in react native - react-native

Question

I'm trying to implement toast message (notification) on my React Native app.
I'm Thinking about implement my Toast component inside app root, and when a button is clicked (somewhere in the app), the app root will know about it and make the toast visible.
I don't want to use a library because I have complicated UI for this and I want to include buttons inside the toast.
This is the root component - App.js:
import { Provider } from 'react-redux';
import {Toast} from './src/components/Toast';
import store from './src/store/Store.js';
import AppNavigator from './src/navigation/AppNavigator';
import StatusBar from './src/components/StatusBar';
export default function App(props) {
return (
<Provider store = { store }>
<View style={styles.container}>
<StatusBar barStyle="default"/>
<AppNavigator />
<Toast></Toast>
</View>
</Provider>
);
}
EDIT:
AppNavigator.js:
// this is how I connect each page:
let HomePage = connect(state => mapStateToProps, dispatch => mapDispatchToProps(dispatch))(HomeScreen);
let SearchPage = connect(state => mapStateToProps, dispatch => mapDispatchToProps(dispatch))(SearchScreen);
const HomeStack = createStackNavigator(
{
Home: HomePage,
Search: SearchPage,
},
config
);
const mapStateToProps = (state) => {
return {
// State
}
};
const mapDispatchToProps = (dispatch) => {
return {
// Actions
}
};
export default tabNavigator;
Any ideas how can I do it? Thanks.

Answer 1

For this, i would suggest to use a component to wrap your application where you have your toast. For example:
App.js
render(){
return (
<Provider store = { store }>
<View style={styles.container}>
<AppContainer/>
</View>
</Provider>
)
}
Where your AppContainer would have a render method similar to this:
render(){
return (
<Frament>
<StatusBar barStyle="default"/>
<AppNavigator />
<Toast></Toast>
</Fragment>
)
}
Then (as you are using redux) you can connect your AppContainer. After that, just make this component aware of changes on redux using componentDidUpdate
componentDidUpdate = (prevProps) => {
if(this.props.redux_toast.visible !== prevProps.redux_toast.visible){
this.setState({
toastVisible : this.props.redux_toast.visible,
toastMessage: this.props.redux_toast.message
})
}
}
This is just an example on how it could be done by using redux, I don't know how your toast or redux structure is, but it should be an available solution for your use case.
EDIT.
This is how it should look like:
//CORE
import React from 'react';
//REDUX
import { Provider } from 'react-redux';
import store from './redux/store/store';
import AppContainer from './AppContainer';
export default () => {
return (
<Provider store={store}>
<AppContainer />
</Provider>
)
}
AppContainer.js:
import React, { Component } from "react";
import { View, Stylesheet } from "react-native";
import StatusBar from "path/to/StatusBar";
import AppNavigator from "path/to/AppNavigator";
import Toast from "path/to/Toast";
import { connect } from "react-redux";
class AppContainer extends Component {
constructor(props){
super(props);
this.state={
toastVisible:false,
toastMessage:""
}
}
componentDidUpdate = (prevProps) => {
if(this.props.redux_toast.visible !== prevProps.redux_toast.visible){
this.setState({
toastVisible : this.props.redux_toast.visible,
toastMessage: this.props.redux_toast.message
})
}
}
render(){
return (
<View style={styles.container}>
<StatusBar barStyle="default"/>
<AppNavigator />
<Toast visible={this.state.toastVisible}
message={this.state.toastMessage}
/>
</View>
)
}
}
const styles = StyleSheet.create({
container:{
flex:1
}
})
const mapStateToProps = state => ({ ...yourMapStateToProp })
const mapDispatchToProps = state => ({ ...mapDispatchToProps })
export default connect(mapStateToProps, mapDispatchToProps)(AppContainer)
Rest of the code remains untouched, you need to dispatch an action that changes a props that your appContainer's componentDidUpdate is listening to (in the example i called it redux_toast.visible).