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WebViewQuillViewer.js
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WebViewQuillViewer.js
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/********************************************
* WebViewQuillViewer.js
* A Delta viewer suitable for viewing output from a Quill.js
* editor. The Delta format is discussed here: https://quilljs.com/docs/delta/
* This component is useful for applications that must avoid using native code
*
*/
import React from 'react';
import {
View,
ActivityIndicator,
StyleSheet,
WebView,
Platform
} from 'react-native';
import PropTypes from 'prop-types';
import renderIf from 'render-if';
import { Asset } from 'expo';
// path to the file that the webview will load
const INDEX_FILE_PATH = `./assets/dist/reactQuillViewer-index.html`;
const INDEX_FILE_ASSET_URI = Asset.fromModule(require(INDEX_FILE_PATH)).uri;
const MESSAGE_PREFIX = 'react-native-webview-quilljs';
export default class WebViewQuillViewer extends React.Component {
constructor() {
super();
this.webview = null;
this.state = {
webViewNotLoaded: true // flag to show activity indicator
};
}
createWebViewRef = (webview) => {
this.webview = webview;
};
handleMessage = (event) => {
let msgData;
try {
msgData = JSON.parse(event.nativeEvent.data);
if (
msgData.hasOwnProperty('prefix') &&
msgData.prefix === MESSAGE_PREFIX
) {
// console.log(`WebViewQuillEditor: received message ${msgData.type}`);
this.sendMessage('MESSAGE_ACKNOWLEDGED');
// console.log(`WebViewQuillEditor: sent MESSAGE_ACKNOWLEDGED`);
switch (msgData.type) {
case 'VIEWER_LOADED':
this.viewerLoaded();
break;
case 'VIEWER_SENT':
this.props.getViewerCallback(msgData.payload.viewer);
break;
default:
console.warn(
`WebViewQuillViewer Error: Unhandled message type received "${
msgData.type
}"`
);
}
}
} catch (err) {
console.warn(err);
return;
}
};
onWebViewLoaded = () => {
console.log('Webview loaded');
this.setState({ webViewNotLoaded: false });
this.sendMessage('LOAD_VIEWER');
if (this.props.hasOwnProperty('backgroundColor')) {
this.sendMessage('SET_BACKGROUND_COLOR', {
backgroundColor: this.props.backgroundColor
});
}
if (this.props.hasOwnProperty('onLoad')) {
this.props.onLoad();
}
if (this.props.hasOwnProperty('getViewerCallback')) {
this.sendMessage('SEND_VIEWER');
}
};
viewerLoaded = () => {
// send the content to the viewer if we have it
if (this.props.hasOwnProperty('contentToDisplay')) {
console.log(this.props.contentToDisplay);
this.sendMessage('SET_CONTENTS', {
ops: this.props.contentToDisplay
});
}
if (this.props.hasOwnProperty('htmlContentToDisplay')) {
this.sendMessage('SET_HTML_CONTENTS', {
html: this.props.htmlContentToDisplay
});
}
};
sendContentToViewer = (delta) => {
this.sendMessage('SET_CONTENTS', {
ops: delta.ops
});
};
sendMessage = (type, payload) => {
// only send message when webview is loaded
if (this.webview) {
console.log(`WebViewQuillViewer: sending message ${type}`);
this.webview.postMessage(
JSON.stringify({
prefix: MESSAGE_PREFIX,
type,
payload
}),
'*'
);
}
};
showLoadingIndicator = () => {
return (
<View style={styles.activityOverlayStyle}>
<View style={styles.activityIndicatorContainer}>
<ActivityIndicator
size="large"
animating={this.state.webViewNotLoaded}
color="green"
/>
</View>
</View>
);
};
onError = (error) => {
Alert.alert('WebView onError', error, [
{ text: 'OK', onPress: () => console.log('OK Pressed') }
]);
};
renderError = (error) => {
Alert.alert('WebView renderError', error, [
{ text: 'OK', onPress: () => console.log('OK Pressed') }
]);
};
render = () => {
return (
<View style={{ flex: 1, overflow: 'hidden' }}>
<WebView
style={{ ...StyleSheet.absoluteFillObject }}
ref={this.createWebViewRef}
source={
Platform.OS === 'ios'
? require('./assets/dist/reactQuillViewer-index.html')
: { uri: INDEX_FILE_ASSET_URI }
}
onLoadEnd={this.onWebViewLoaded}
onMessage={this.handleMessage}
startInLoadingState={true}
renderLoading={this.showLoadingIndicator}
renderError={this.renderError}
javaScriptEnabled={true}
onError={this.onError}
scalesPageToFit={false}
mixedContentMode={'always'}
/>
</View>
);
};
}
WebViewQuillViewer.propTypes = {
backgroundColor: PropTypes.string,
onLoad: PropTypes.func
};
// Specifies the default values for props:
WebViewQuillViewer.defaultProps = {
theme: 'bubble'
};
const styles = StyleSheet.create({
activityOverlayStyle: {
...StyleSheet.absoluteFillObject,
marginHorizontal: 20,
marginVertical: 60,
display: 'flex',
justifyContent: 'center',
alignContent: 'center',
borderRadius: 5
},
activityIndicatorContainer: {
backgroundColor: 'white',
padding: 10,
borderRadius: 50,
alignSelf: 'center',
shadowColor: '#000000',
shadowOffset: {
width: 0,
height: 3
},
shadowRadius: 5,
shadowOpacity: 1.0
}
});