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ThrowAnimated.js
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ThrowAnimated.js
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import React from 'react';
import {StyleSheet, Dimensions, Animated} from 'react-native';
import {PanGestureHandler, State} from 'react-native-gesture-handler';
// import Animated from 'react-native-reanimated';
const {width, height} = Dimensions.get('window');
const MAX_HEIGHT_TRANS = 300 * 10;
const MAX_WIDTH_TRANS = 200 * 10;
const MAX_TRANS_HORIZONTAL = MAX_WIDTH_TRANS / 2;
const MAX_TRANS_VERTICAL = MAX_HEIGHT_TRANS / 2;
const DRAG_TOSS = 0.05;
const {Value, spring, parallel} = Animated;
class ThrowAnimated extends React.Component {
constructor(props) {
super(props);
this.state = {
transX: new Value(0),
transY: new Value(0),
};
this._onHandlerStateChange = event => {
if (event.nativeEvent.oldState === State.ACTIVE) {
this.state.transX.setOffset(0);
this.state.transY.setOffset(0);
}
if (event.nativeEvent.oldState === State.ACTIVE) {
const endOffsetX =
event.nativeEvent.velocityX > 0
? Math.min(
event.nativeEvent.translationX +
DRAG_TOSS * event.nativeEvent.velocityX,
MAX_TRANS_HORIZONTAL - 100,
)
: Math.max(
event.nativeEvent.translationX +
DRAG_TOSS * event.nativeEvent.velocityX,
-MAX_TRANS_HORIZONTAL + 315,
);
const endOffsetY =
event.nativeEvent.velocityY > 0
? Math.min(
event.nativeEvent.translationY +
DRAG_TOSS * event.nativeEvent.velocityY,
MAX_TRANS_VERTICAL - 150,
)
: Math.max(
event.nativeEvent.translationY +
DRAG_TOSS * event.nativeEvent.velocityY,
-MAX_TRANS_VERTICAL + 510,
);
parallel([
spring(this.state.transX, {
velocity: event.nativeEvent.velocityX,
tension: 100,
friction: 10,
toValue: endOffsetX,
}),
spring(this.state.transY, {
velocity: event.nativeEvent.velocityY,
tension: 100,
friction: 10,
toValue: endOffsetY,
}),
]).start(() => {
this.state.transX.setOffset(endOffsetX);
this.state.transY.setOffset(endOffsetY);
});
}
};
this._onGestureEvent = Animated.event([
{
nativeEvent: {
translationX: this.state.transX,
translationY: this.state.transY,
},
},
]);
}
render() {
return (
<PanGestureHandler
maxPointers={1}
activeOffsetX={20}
activeOffsetY={40}
onGestureEvent={this._onGestureEvent}
onHandlerStateChange={this._onHandlerStateChange}
avgTouches>
<Animated.View
style={[
styles.container,
{
transform: [
{
translateY: this.state.transY,
},
{translateX: this.state.transX},
],
},
]}>
{this.props.children}
</Animated.View>
</PanGestureHandler>
);
}
}
const styles = StyleSheet.create({
container: {
...StyleSheet.absoluteFillObject,
width: MAX_WIDTH_TRANS,
height: MAX_HEIGHT_TRANS,
top: -MAX_HEIGHT_TRANS / 2 + 150,
left: -MAX_WIDTH_TRANS / 2 + 100,
},
});
export default ThrowAnimated;