Interactive Color Mixer App: Building with Flutter
Learn to create an interactive Color Mixer app using Flutter, where users can adjust sliders to mix custom colors. Explore user input and interactive widgets in this engaging mini-project.
5.1.4 Mini Project: Color Mixer
Welcome to the exciting world of interactive app development! In this mini-project, we’ll be building a Color Mixer app using Flutter. This project will help you understand how to use user input and interactive widgets to create a dynamic and engaging application. Let’s dive in!
Objective
The goal of this project is to create an app where users can adjust sliders to mix custom colors. As users move the sliders for red, green, and blue, the background color of the app will change to reflect the selected color. This hands-on project will teach you how to handle user input and update the UI in real-time.
Project Overview
Our Color Mixer app will consist of three main components:
- Sliders for adjusting the red, green, and blue color values.
- A display area to show the mixed color based on the slider values.
- Real-time updates to the display area as the sliders are adjusted.
Step-by-Step Guide
Let’s break down the process of building the Color Mixer app into manageable steps:
1. Set Up the UI
First, we’ll set up the user interface with three sliders, each representing one of the primary colors: red, green, and blue. We’ll also include a display area to show the mixed color.
2. Create Variables
Next, we’ll declare variables to store the values of each slider. These variables will be used to calculate the mixed color.
3. Handle Slider Changes
We’ll write code to update the color display whenever a slider is adjusted. This involves listening for changes in the slider values and updating the UI accordingly.
4. Display Color
Finally, we’ll use a Container widget to display the mixed color. The color of the container will change based on the current values of the sliders.
Code Example
Here’s a complete code example for the Color Mixer app:
import 'package:flutter/material.dart';
void main() {
runApp(ColorMixerApp());
}
class ColorMixerApp extends StatefulWidget {
@override
_ColorMixerAppState createState() => _ColorMixerAppState();
}
class _ColorMixerAppState extends State<ColorMixerApp> {
double red = 0;
double green = 0;
double blue = 0;
Color get mixedColor => Color.fromRGBO(red.toInt(), green.toInt(), blue.toInt(), 1);
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('Color Mixer'),
),
body: Padding(
padding: EdgeInsets.all(16.0),
child: Column(
children: [
Text(
'Red: ${red.toInt()}',
style: TextStyle(fontSize: 20, color: Colors.red),
),
Slider(
value: red,
min: 0,
max: 255,
divisions: 255,
activeColor: Colors.red,
onChanged: (double value) {
setState(() {
red = value;
});
},
),
Text(
'Green: ${green.toInt()}',
style: TextStyle(fontSize: 20, color: Colors.green),
),
Slider(
value: green,
min: 0,
max: 255,
divisions: 255,
activeColor: Colors.green,
onChanged: (double value) {
setState(() {
green = value;
});
},
),
Text(
'Blue: ${blue.toInt()}',
style: TextStyle(fontSize: 20, color: Colors.blue),
),
Slider(
value: blue,
min: 0,
max: 255,
divisions: 255,
activeColor: Colors.blue,
onChanged: (double value) {
setState(() {
blue = value;
});
},
),
SizedBox(height: 20),
Container(
width: double.infinity,
height: 150,
color: mixedColor,
child: Center(
child: Text(
'Your Color',
style: TextStyle(
fontSize: 24,
color: mixedColor.computeLuminance() > 0.5 ? Colors.black : Colors.white,
),
),
),
),
],
),
),
),
);
}
}
Visuals
To better understand the flow of the Color Mixer app, let’s look at a diagram that outlines the process:
flowchart TD
A[Start App] --> B[Display Sliders for Red, Green, Blue]
B --> C[User Adjusts Slider]
C --> D[Update Color Variable]
D --> E[Change Container Color]
E --> F[Display Updated Color]
Language and Engagement
As you build your Color Mixer app, remember to have fun and experiment with different color combinations. Celebrate your creativity and enjoy the process of seeing your app come to life!
Encouragement
Congratulations on creating your very own Color Mixer app! You’ve learned how to handle user input and update the UI in real-time. Keep experimenting with different colors and see what beautiful combinations you can create. You’re doing an amazing job, and this is just the beginning of your coding journey!
