Progressively load images. Loads a small thumbnail first. Includes fade and blur effects. 

dylanvann

react-native-progressive-image

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import React, { Component, PropTypes } from 'react'

import { Animated, View, Image, StyleSheet } from 'react-native'

export default class ProgressiveImage extends Component {

      imageOpacity: new Animated.Value(0),

      thumbnailOpacity: new Animated.Value(0),

    Animated.timing(this.state.thumbnailOpacity, {

      duration: this.props.thumbnailFadeDuration,

    Animated.timing(this.state.imageOpacity, {

      duration: this.props.imageFadeDuration,

          style={[styles.image, this.props.style]}

          source={this.props.placeHolderSource}

          style={[styles.image, { opacity: this.state.thumbnailOpacity }, this.props.style]}

          source={this.props.thumbnailSource}

          onLoad={() => this.onLoadThumbnail()}

          blurRadius={this.props.thumbnailBlurRadius}

          style={[styles.image, { opacity: this.state.imageOpacity }, this.props.style]}

          source={this.props.imageSource}

          onLoad={() => this.onLoadImage()}

  imageSource: PropTypes.object.isRequired,

  imageFadeDuration: PropTypes.number.isRequired,

  onLoadThumbnail: PropTypes.func.isRequired,

  onLoadImage: PropTypes.func.isRequired,

  thumbnailSource: PropTypes.object.isRequired,

  thumbnailFadeDuration: PropTypes.number.isRequired,

  "name": "react-native-progressive-image",

  "description": "Progressively load images. Loads a small thumbnail first. Includes fade and blur effects.",

  "author": "Dylan Vann <dylan.vann@gmail.com> (dylanvann.com)",

  "repository": "DylanVann/react-native-progressive-image"

![react-native-progressive-image demo](http://i.imgur.com/Ww5qqKz.gif)

Based on [Sharath Prabhal's blog post](https://medium.com/the-react-native-log/progressive-image-loading-in-react-native-ecc88e724343#.e5pm41efa).

`npm i -S react-native-progressive-image`

import ProgressiveImage from 'react-native-progressive-image'

    thumbnailSource={{ uri: 'http://i.imgur.com/O249H4P.png?bust' + Math.random() }}

    imageSource={{ uri: 'http://i.imgur.com/741u15U.png?bust' + Math.random() }}

    style={{ flex: 1, alignItems: 'stretch' }}

| **`imageSource`** | Image source (e.g. { uri: 'https://facebook.github.io/react/img/logo_og.png' }). | None |

| **`thumbnailSource`** | Should be a low resolution version of the image used in `imageSource`. | None |

| **`thumbnailBlurRadius`** | Blur radius for the low resolution thumbnail (iOS only). | `5` |

| **`style`** | Make sure to include width and height, or use flex. | None |

| **`imageFadeDuration`** | Fade-in duration for the image in ms. | `250` |

| **`thumbnailFadeDuration`** | Fade-in duration for the thumbnail in ms. | `250` |

| **`onLoadThumbnail`** | Callback function that gets called when the thumbnail is loaded. | `noop` |

| **`onLoadImage`** | Callback function that gets called when the main image is loaded. | `noop` |

		@@ -18,2 +18,3 @@ import React, { Component, PropTypes } from 'react'
		}).start()
		this.props.onLoadThumbnail()
		}
		@@ -26,2 +27,3 @@
		}).start()
		this.props.onLoadImage()
		}
		@@ -70,2 +72,4 @@
		imageFadeDuration: PropTypes.number.isRequired,
		onLoadThumbnail: PropTypes.func.isRequired,
		onLoadImage: PropTypes.func.isRequired,
		thumbnailSource: PropTypes.object.isRequired,
		@@ -80,2 +84,4 @@ thumbnailFadeDuration: PropTypes.number.isRequired,
		thumbnailBlurRadius: 5,
		onLoadThumbnail: Function.prototype,
		onLoadImage: Function.prototype,
		}

		{
		"name": "react-native-progressive-image",
		"version": "1.0.3",
		"version": "1.0.4",
		"description": "Progressively load images. Loads a small thumbnail first. Includes fade and blur effects.",
		@@ -5,0 +5,0 @@ "keywords": [

Improved metrics

Worsened metrics

		@@ -35,1 +35,3 @@ # react-native-progressive-image
		\| `thumbnailFadeDuration` \| Fade-in duration for the thumbnail in ms. \| `250` \|
		\| `onLoadThumbnail` \| Callback function that gets called when the thumbnail is loaded. \| `noop` \|
		\| `onLoadImage` \| Callback function that gets called when the main image is loaded. \| `noop` \|