npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, πŸ‘‹, I’m Ryan HefnerΒ  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you πŸ™

Β© 2019 – Ryan Hefner

react-native-fast-image

v7.0.2

Published

🚩 FastImage, performant React Native image component.

Downloads

218,787

Readme

🚩 FastImage

Performant React Native image component.

Version Downloads Build Status Code Coverage

Watch on GitHub Star on GitHub Tweet


FastImage example app.

React Native's Image component handles image caching like browsers for the most part. If the server is returning proper cache control headers for images you'll generally get the sort of built in caching behavior you'd have in a browser. Even so many people have noticed:

  • Flickering.
  • Cache misses.
  • Low performance loading from cache.
  • Low performance in general.

FastImage is an Image replacement that solves these issues. FastImage is a wrapper around SDWebImage (iOS) and Glide (Android).

Features

  • Aggressively cache images.
  • Add authorization headers.
  • Prioritize images.
  • Preload images.
  • GIF support.
  • Border radius.

Usage

yarn add react-native-fast-image
import FastImage from 'react-native-fast-image'

const YourImage = () => (
    <FastImage
        style={{ width: 200, height: 200 }}
        source={{
            uri: 'https://unsplash.it/400/400?image=1',
            headers: { Authorization: 'someAuthToken' },
            priority: FastImage.priority.normal,
        }}
        resizeMode={FastImage.resizeMode.contain}
    />
)

Are you using Glide already using an AppGlideModule?

Are you using Proguard?

If you use Proguard you will need to add these lines to android/app/proguard-rules.pro:

-keep public class com.dylanvann.fastimage.* {*;}
-keep public class com.dylanvann.fastimage.** {*;}
-keep public class * implements com.bumptech.glide.module.GlideModule
-keep public class * extends com.bumptech.glide.module.AppGlideModule
-keep public enum com.bumptech.glide.load.ImageHeaderParser$** {
  **[] $VALUES;
  public *;
}

Properties

source?: object

Source for the remote image to load.


source.uri?: string

Remote url to load the image from. e.g. 'https://facebook.github.io/react/img/logo_og.png'.


source.headers?: object

Headers to load the image with. e.g. { Authorization: 'someAuthToken' }.


source.priority?: enum

  • FastImage.priority.low - Low Priority.
  • FastImage.priority.normal (Default) - Normal Priority.
  • FastImage.priority.high - High Priority.

source.cache?: enum

  • FastImage.cacheControl.immutable - (Default) - Only updates if url changes.
  • FastImage.cacheControl.web - Use headers and follow normal caching procedures.
  • FastImage.cacheControl.cacheOnly - Only show images from cache, do not make any network requests.

resizeMode?: enum

  • FastImage.resizeMode.contain - Scale the image uniformly (maintain the image's aspect ratio) so that both dimensions (width and height) of the image will be equal to or less than the corresponding dimension of the view (minus padding).
  • FastImage.resizeMode.cover (Default) - Scale the image uniformly (maintain the image's aspect ratio) so that both dimensions (width and height) of the image will be equal to or larger than the corresponding dimension of the view (minus padding).
  • FastImage.resizeMode.stretch - Scale width and height independently, This may change the aspect ratio of the src.
  • FastImage.resizeMode.center - Do not scale the image, keep centered.

onLoadStart?: () => void

Called when the image starts to load.


onProgress?: (event) => void

Called when the image is loading.

e.g. onProgress={e => console.log(e.nativeEvent.loaded / e.nativeEvent.total)}


onLoad?: (event) => void

Called on a successful image fetch. Called with the width and height of the loaded image.

e.g. onLoad={e => console.log(e.nativeEvent.width, e.nativeEvent.height)}


onError?: () => void

Called on an image fetching error.


onLoadEnd?: () => void

Called when the image finishes loading, whether it was successful or an error.


style

A React Native style. Supports using borderRadius.


fallback: boolean

If true will fallback to using Image. In this case the image will still be styled and laid out the same way as FastImage.


tintColor?: number | string

If supplied, changes the color of all the non-transparent pixels to the given color.

Static Methods

FastImage.preload: (source[]) => void

Preload images to display later. e.g.

FastImage.preload([
    {
        uri: 'https://facebook.github.io/react/img/logo_og.png',
        headers: { Authorization: 'someAuthToken' },
    },
    {
        uri: 'https://facebook.github.io/react/img/logo_og.png',
        headers: { Authorization: 'someAuthToken' },
    },
])

Troubleshooting

If you have any problems using this library try the steps in troubleshooting and see if they fix it.

Development

Follow these instructions to get the example app running.

Supported React Native Versions

This project only aims to support the latest version of React Native.\ This simplifies the development and the testing of the project.

If you require new features or bug fixes for older versions you can fork this project.

Credits

The idea for this modules came from vovkasm's react-native-web-image package. It also uses Glide and SDWebImage, but didn't have some features I needed (priority, headers).

Thanks to @mobinni for helping with the conceptualization

Licenses

  • FastImage - MIT Β© DylanVann
  • SDWebImage - MIT
  • Glide - BSD, part MIT and Apache 2.0. See the LICENSE file for details.