@sendbird/uikit-react-native-foundation/lib/module/styles/createScaleFactor.js

A foundational UI kit for building chat-enabled React Native apps.

import { Dimensions, PixelRatio } from 'react-native';
const {
  width,
  height
} = Dimensions.get('window');
const DESIGNED_DEVICE_WIDTH = 360;
const createScaleFactor = (deviceWidth = DESIGNED_DEVICE_WIDTH) => {
  const ratio = Math.min(width, height) / deviceWidth;
  const rangedRatio = Math.min(Math.max(0.85, ratio), 1.25);
  return dp => PixelRatio.roundToNearestPixel(dp * rangedRatio);
};
export let DEFAULT_SCALE_FACTOR = createScaleFactor();
export default Object.assign(createScaleFactor, {
  updateScaleFactor: scaleFactor => {
    DEFAULT_SCALE_FACTOR = scaleFactor;
  }
});
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