color_extract

Color Extract is a Flutter package that allows you to extract and calculate colors from your app's widgets. You can use it to change the color of a widget depending/based on the color of the background (the other widget behind).

Preview

(Video player may not show on pub.dev, check github.com) https://user-images.githubusercontent.com/44414626/220677525-30942250-ceb2-4e85-a8af-1cb2317e4ed5.mp4

Demo

In this demo see how you can make your widget change colors like a chameleon 🦎.

Installation

Add the following to your pubspec.yaml:

dependencies:
  color_extract: ^1.0.1

Then run flutter pub get.

Usage

ColorExtractor

The ColorExtractor it's the widget we want to extract the average color from. It serves as a wrapper for RepaintBoundary, so you can utilize RepaintBoundary as an alternative.

ColorExtractor(
  boundaryKey: GlobalKey(),
  child: Container(
    width: 200,
    height: 200,
    color: Colors.red,
  ),
);

ColorAverager

The ColorAverager widget computes the average color of a specific portion of either ColorExtractor or RepaintBoundary. Its application is useful in determining the dominant color of a certain area, such as the background behind a logo, image.

ColorAverager(
  boundaryKey: GlobalKey(),
  child: SizedBox(
    width: 50,
    height: 50,
  ),
  onChanged: (color) {
    // Handle the new average color.
  },
);

You can also use the ColorAveragerController to calculate the average color programmatically.

final controller = ColorAveragerController();

// ... render the widget ...

final avgColor = await controller.calculateAvgColor();

Example

import 'package:flutter/material.dart';
import 'package:color_extract/color_extract.dart';

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(
        children: [
          ColorExtractor(
            boundaryKey: boundaryKey,
            child: Container(
              width: 200,
              height: 200,
              color: Colors.blue,
            ),
          ),
          ColorAverager(
            // boundaryKey should be the same one in the above ColorExtractor boundaryKey
            boundaryKey: boundaryKey,
            // You can use the controller (ColorAveragerController) too.
            // controller: controller,
            child: const SizedBox(width: 50, height: 50),
            onChanged: (color) {
                // Do something with the average color.
                // color should be = Colors.blue
            },
          )
        ],
      )
    );
  }
}

Author

itisnajim, itisnajim@gmail.com

License

color_extract is available under the MIT license. See the LICENSE file for more info.