react-native-ios-visual-effect-view/example/src/examples/CustomFilterViewExample01.tsx at main · dominicstop/react-native-ios-visual-effect-view · GitHub

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// @ts-ignore
import * as React from 'react';
import { StyleSheet, View, Text, Dimensions } from 'react-native';

import { CustomFilterView } from 'react-native-ios-visual-effect-view';

const WINDOW_SIZE = Dimensions.get('window');

// 1 = black, 0 = transparent


const emojiString =
    "❤️🛑🍒🍓💃"
  + "\n🧡🍊🥕🍑🎃"
  + "\n💛🌟🌻🍋🍌"
  + "\n💚🍀🌿🍏🌳"
  + "\n💙🌊🦋🔵💎"
  + "\n💜🍇💐🛸🌌"
  + "\n💖🌸💝🎀💗"
  + "\n🤍✨🌙🦢🦄"
  + "\n🖤🌑🦇🕷️🕸️";

export function CustomFilterViewExample01() {
  return (
    <View style={styles.container}>
      <Text style={styles.label}>
        {emojiString}
      </Text>
      <CustomFilterView
        style={styles.effectOverlay}

        // increase quality (usually: 0.25...1)
        backgroundLayerSamplingSizeScale={1}

        // set the filters to use,
        // accepts an array of `LayerFilterConfig`
        currentFilters={{
          backgroundFilters: [
            // filter 1 of 4
            // create variable blur filter
            {
              filterName: 'variadicBlur',
              radius: 8,
              shouldNormalizeEdges: true,

              // define the intensity of blur via a gradient
              gradientMask: {
                type: 'axial',
                colors: [
                  'rgba(0,0,0,1)', // max blur
                  'rgba(0,0,0,0)', // no blur
                ],
                startPointPreset: 'topCenter',
                endPointPreset: 'bottomCenter',
                size: {
                  height: WINDOW_SIZE.height,
                  width: WINDOW_SIZE.width,
                },
              }
            },

            // filter 2 of 4
            // Slightly desaturate colors
            {
              filterName: 'colorBlackAndWhite',
              amount: 0.5
            },

            // filter 3 of 4
            // reduce brightness
            {
              filterName: 'brightenColors',
              amount: -0.5
            },

            // filter 4 of 4
            // decrease contrast
            {
              filterName: 'contrastColors',
              amount: 0.4,
            },
          ]
        }}
      >
        <Text>
          {'Hello World'}
        </Text>
      </CustomFilterView>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
    backgroundColor: 'white',
  },
  label: {
    fontSize: 72,
  },
  effectOverlay: {
    position: 'absolute',
    top: 0,
    bottom: 0,
    left: 0,
    right: 0,
  },
});