118 lines
2.9 KiB
JavaScript
118 lines
2.9 KiB
JavaScript
'use strict';
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/* @flow */
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import React, { Component } from 'react';
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import PropTypes from 'prop-types';
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import {
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Platform,
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View,
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Keyboard,
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LayoutAnimation,
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} from 'react-native';
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type Props = {
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offset?: number,
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}
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type State = {
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keyboardHeight: number
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}
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// Consider contributing this to the popular library:
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// https://github.com/Andr3wHur5t/react-native-keyboard-spacer
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/**
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* On iOS, the software keyboard covers the screen by default.
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* This is not desirable if there are TextInputs near the bottom of the screen -
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* they would be covered by the keyboard and the user cannot see what they
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* are typing.
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* To get around this problem, place a `<KeyboardSpacer />` at the bottom
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* of the screen, after your TextInputs. The keyboard spacer has size 0 and
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* when the keyboard is shown it will grow to the same size as the keyboard,
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* shifting all views above it and therefore making them visible.
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*
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* On Android, this component is not needed because resizing the UI when
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* the keyboard is shown is supported by the OS.
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* Simply set the `android:windowSoftInputMode="adjustResize"` attribute
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* on the <activity> element in your AndroidManifest.xml.
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*
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* How is this different from KeyboardAvoidingView?
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* The KeyboardAvoidingView doesn't work when used together with
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* a ScrollView/ListView.
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*/
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const KeyboardSpacer = () => (
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Platform.OS === 'ios' ? <KeyboardSpacerIOS /> : null
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);
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class KeyboardSpacerIOS extends Component<Props, State> {
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static propTypes = {
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offset: PropTypes.number,
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};
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static defaultProps = {
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offset: 0,
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};
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state: State = {
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keyboardHeight: 0,
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};
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componentWillMount() {
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this._registerEvents();
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}
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componentWillUnmount() {
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this._unRegisterEvents();
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}
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_keyboardWillShowSubscription: { +remove: Function };
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_keyboardWillHideSubscription: { +remove: Function };
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_registerEvents = () => {
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this._keyboardWillShowSubscription = Keyboard.addListener(
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'keyboardWillShow',
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this._keyboardWillShow
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);
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this._keyboardWillHideSubscription = Keyboard.addListener(
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'keyboardWillHide',
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this._keyboardWillHide
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);
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};
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_unRegisterEvents = () => {
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this._keyboardWillShowSubscription.remove();
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this._keyboardWillHideSubscription.remove();
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};
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_configureLayoutAnimation = () => {
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// Any duration is OK here. The `type: 'keyboard defines the animation.
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LayoutAnimation.configureNext({
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duration: 100,
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update: {
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type: 'keyboard',
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}
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});
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}
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_keyboardWillShow = (e: any) => {
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this._configureLayoutAnimation();
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this.setState({
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keyboardHeight: e.endCoordinates.height - (this.props.offset || 0),
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});
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};
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_keyboardWillHide = () => {
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this._configureLayoutAnimation();
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this.setState({
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keyboardHeight: 0,
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});
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};
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render() {
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return <View style={{ height: this.state.keyboardHeight }} />;
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}
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}
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export default KeyboardSpacer;
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