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Hammer.js
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Hammer.js
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import PropTypes from 'prop-types';
import React from 'react';
// require('hammerjs') when in a browser. This is safe because Hammer is only
// invoked in componentDidMount, which is not executed on the server.
const Hammer = typeof window !== 'undefined' ? require('hammerjs') : undefined;
var privateProps = {
children: true,
direction: true,
options: true,
recognizeWith: true,
vertical: true,
};
/**
* Hammer Component
* ================
*/
const handlerToEvent = {
action: 'tap press',
onDoubleTap: 'doubletap',
onPan: 'pan',
onPanCancel: 'pancancel',
onPanEnd: 'panend',
onPanStart: 'panstart',
onPinch: 'pinch',
onPinchCancel: 'pinchcancel',
onPinchEnd: 'pinchend',
onPinchIn: 'pinchin',
onPinchOut: 'pinchout',
onPinchStart: 'pinchstart',
onPress: 'press',
onPressUp: 'pressup',
onRotate: 'rotate',
onRotateCancel: 'rotatecancel',
onRotateEnd: 'rotateend',
onRotateMove: 'rotatemove',
onRotateStart: 'rotatestart',
onSwipe: 'swipe',
onSwipeRight: 'swiperight',
onSwipeLeft: 'swipeleft',
onSwipeUp: 'swipeup',
onSwipeDown: 'swipedown',
onTap: 'tap',
};
Object.keys(handlerToEvent).forEach(function(i) {
privateProps[i] = true;
});
function updateHammer(hammer, props) {
if (props.hasOwnProperty('vertical')) {
console.warn('vertical is deprecated, please use `direction` instead');
}
var directionProp = props.direction;
if (directionProp || props.hasOwnProperty('vertical')) {
var direction = directionProp
? directionProp
: props.vertical ? 'DIRECTION_ALL' : 'DIRECTION_HORIZONTAL';
hammer.get('pan').set({ direction: Hammer[direction] });
hammer.get('swipe').set({ direction: Hammer[direction] });
}
if (props.options) {
Object.keys(props.options).forEach(function(option) {
if (option === 'recognizers') {
Object.keys(props.options.recognizers).forEach(function(gesture) {
var recognizer = hammer.get(gesture);
recognizer.set(props.options.recognizers[gesture]);
if (props.options.recognizers[gesture].requireFailure) {
recognizer.requireFailure(
props.options.recognizers[gesture].requireFailure
);
}
}, this);
} else {
var key = option;
var optionObj = {};
optionObj[key] = props.options[option];
hammer.set(optionObj);
}
}, this);
}
if (props.recognizeWith) {
Object.keys(props.recognizeWith).forEach(function(gesture) {
var recognizer = hammer.get(gesture);
recognizer.recognizeWith(props.recognizeWith[gesture]);
}, this);
}
Object.keys(props).forEach(function(p) {
var e = handlerToEvent[p];
if (e) {
hammer.off(e);
hammer.on(e, props[p]);
}
});
}
export default class HammerComponent extends React.Component {
static displayName = 'Hammer';
static propTypes = {
className: PropTypes.string,
};
componentDidMount() {
this.hammer = new Hammer(this.domElement);
updateHammer(this.hammer, this.props);
}
componentDidUpdate() {
if (this.hammer) {
updateHammer(this.hammer, this.props);
}
}
componentWillUnmount() {
if (this.hammer) {
this.hammer.stop();
this.hammer.destroy();
}
this.hammer = null;
}
render() {
var props = {};
Object.keys(this.props).forEach(function(i) {
if (!privateProps[i]) {
props[i] = this.props[i];
}
}, this);
var self = this;
props.ref = function(domElement) {
if (self.props.ref) {
self.props.ref(domElement);
}
self.domElement = domElement;
};
// Reuse the child provided
// This makes it flexible to use whatever element is wanted (div, ul, etc)
return React.cloneElement(React.Children.only(this.props.children), props);
}
}