[FIX] Messagebox onChangeText issues (#1252)

* Stop ongoing debounces on messagebox unmount

* Immediately change send icon, but keep debouncing others

* Make CustomEmoji stateless function

* Fix mentions keyExtractor

app/containers/EmojiPicker/CustomEmoji.js

@@ -2,20 +2,7 @@ import React from 'react';
 import FastImage from 'react-native-fast-image';
 import PropTypes from 'prop-types';
 
-export default class CustomEmoji extends React.Component {
-	static propTypes = {
-		baseUrl: PropTypes.string.isRequired,
-		emoji: PropTypes.object.isRequired,
-		style: PropTypes.any
-	}
-
-	shouldComponentUpdate() {
-		return false;
-	}
-
-	render() {
-		const { baseUrl, emoji, style } = this.props;
-		return (
+const CustomEmoji = React.memo(({ baseUrl, emoji, style }) => (
 	<FastImage
 		style={style}
 		source={{
@@ -24,6 +11,16 @@ export default class CustomEmoji extends React.Component {
 		}}
 		resizeMode={FastImage.resizeMode.contain}
 	/>
-		);
-	}
-}
+), (prevProps, nextProps) => {
+	const prevEmoji = prevProps.emoji.content || prevProps.emoji.name;
+	const nextEmoji = nextProps.emoji.content || nextProps.emoji.name;
+	return prevEmoji === nextEmoji;
+});
+
+CustomEmoji.propTypes = {
+	baseUrl: PropTypes.string.isRequired,
+	emoji: PropTypes.object.isRequired,
+	style: PropTypes.any
+};
+
+export default CustomEmoji;

app/containers/MessageBox/index.js

@@ -224,12 +224,34 @@ class MessageBox extends Component {
 
 	componentWillUnmount() {
 		console.countReset(`${ this.constructor.name }.render calls`);
+		if (this.onChangeText && this.onChangeText.stop) {
+			this.onChangeText.stop();
+		}
+		if (this.getUsers && this.getUsers.stop) {
+			this.getUsers.stop();
+		}
+		if (this.getRooms && this.getRooms.stop) {
+			this.getRooms.stop();
+		}
+		if (this.getEmojis && this.getEmojis.stop) {
+			this.getEmojis.stop();
+		}
+		if (this.getSlashCommands && this.getSlashCommands.stop) {
+			this.getSlashCommands.stop();
+		}
 	}
 
-	onChangeText = debounce(async(text) => {
-		const db = database.active;
+	onChangeText = (text) => {
 		const isTextEmpty = text.length === 0;
 		this.setShowSend(!isTextEmpty);
+		this.debouncedOnChangeText(text);
+	}
+
+	// eslint-disable-next-line react/sort-comp
+	debouncedOnChangeText = debounce(async(text) => {
+		const db = database.active;
+		const isTextEmpty = text.length === 0;
+		// this.setShowSend(!isTextEmpty);
 		this.handleTyping(!isTextEmpty);
 		this.setInput(text);
 		// matches if their is text that stats with '/' and group the command and params so we can use it "/command params"
@@ -248,9 +270,10 @@ class MessageBox extends Component {
 		}
 
 		if (!isTextEmpty) {
+			try {
 				const { start, end } = this.component._lastNativeSelection;
 				const cursor = Math.max(start, end);
-			const lastNativeText = this.component._lastNativeText;
+				const lastNativeText = this.component._lastNativeText || '';
 				// matches if text either starts with '/' or have (@,#,:) then it groups whatever comes next of mention type
 				const regexp = /(#|@|:|^\/)([a-z0-9._-]+)$/im;
 				const result = lastNativeText.substr(0, cursor).match(regexp);
@@ -263,10 +286,13 @@ class MessageBox extends Component {
 				}
 				const [, lastChar, name] = result;
 				this.identifyMentionKeyword(name, lastChar);
+			} catch (e) {
+				log(e);
+			}
 		} else {
 			this.stopTrackingMention();
 		}
-	}, 100, true)
+	}, 100)
 
 	onKeyboardResigned = () => {
 		this.closeEmoji();
@@ -339,10 +365,10 @@ class MessageBox extends Component {
 	getFixedMentions = (keyword) => {
 		let result = [];
 		if ('all'.indexOf(keyword) !== -1) {
-			result = [{ _id: -1, username: 'all' }];
+			result = [{ id: -1, username: 'all' }];
 		}
 		if ('here'.indexOf(keyword) !== -1) {
-			result = [{ _id: -2, username: 'here' }, ...result];
+			result = [{ id: -2, username: 'here' }, ...result];
 		}
 		return result;
 	}
@@ -813,8 +839,9 @@ class MessageBox extends Component {
 				<FlatList
 					style={styles.mentionList}
 					data={mentions}
+					extraData={mentions}
 					renderItem={this.renderMentionItem}
-					keyExtractor={item => item._id || item.username || item.command || item}
+					keyExtractor={item => item.id || item.username || item.command || item}
 					keyboardShouldPersistTaps='always'
 				/>
 			</ScrollView>