react-native-gesture-handler/lib/module/web_hammer/DraggingGestureHandler.js

Declarative API exposing native platform touch and gesture system to React Native

/* eslint-disable eslint-comments/no-unlimited-disable */

/* eslint-disable */
import GestureHandler from './GestureHandler';
import { PixelRatio } from 'react-native';

class DraggingGestureHandler extends GestureHandler {
  get shouldEnableGestureOnSetup() {
    return true;
  }

  transformNativeEvent({
    deltaX,
    deltaY,
    velocityX,
    velocityY,
    center: {
      x,
      y
    }
  }) {
    // @ts-ignore FIXME(TS)
    const rect = this.view.getBoundingClientRect();
    const ratio = PixelRatio.get();
    return {
      translationX: deltaX - (this.__initialX || 0),
      translationY: deltaY - (this.__initialY || 0),
      absoluteX: x,
      absoluteY: y,
      velocityX: velocityX * ratio,
      velocityY: velocityY * ratio,
      x: x - rect.left,
      y: y - rect.top
    };
  }

}

export default DraggingGestureHandler;
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