Flutter Image Package

Flutter Sanity Image URL

A dart package to quickly generate sanity image urls. Ported from sanity-io/image-url.

Intented to be used together with the flutter_sanity package

Features

Easily make use of all of the image related features provided by Sanity:

• Allow editors of content to specify crops and hotspots, which will be respected in the app by creating the correct url.
• Apply image transformations, like setting the width and height of an image through a ImageUrlBuilder.
• Provides a SanityImage.fromJson() method that parses the image data from sanity into an object with all data and metadata being typed:
  • Access the sanity image color palette, for better styling based on images.
  • Access to lqip to implement low resolution image placeholders.

Getting started

dart pub add flutter_sanity flutter_sanity_image_url

Usage

See /example for a full example.

Displaying an Image:

1. create an instance of ImageUrlBuilder which you can then use throughout your app.
2. get an image url by chaining calls to the ImageUrlBuilder.

1. Creating a builder:

// sanityClient is an instance of SanityClient from flutter_sanity
final builder = ImageUrlBuilder(sanityClient);

ImageUrlBuilder urlFor(asset) {
  return builder.image(asset);
}

2. Using the builder:

using the builder design patten the options can be added in a chain, always call url() at the end to get the actual url of the image.

Image.network(urlFor(image).size(200, 200).url())

Accessing the image color palette data

Available colors in the pallette:

• darkMuted
• darkVibrant
• dominant
• lightMuted
• lightVibrant
• muted
• vibrant

Each has color has the attributes:

• background
• foreground
• title

Example of using the color pallette for an image:

print(myImage.palette?.darkMuted.background);
// output: Color(0xff2c3b52)

See the example project for an example of styling text and background overlays based on the color pallette.

Accessing Low Quality Image Previews for low resolution image placeholders.

LQIP (Low-Quality Image Preview) is a 20-pixel wide version of your image (height is set according to aspect ratio) in the form of a base64-encoded string.

By using the flutter_sanity_image package you can use Low Quality Image Previews in two ways:

Use the provided placeholder widget:

ImagePlaceholder(lqip: pictures[0].lqip);

Access the lqip directly to implement into your own widget:

print(myImage.lqip)
/*
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
*/