Pattern Maker App: Create Your Own Designs with Flutter
Learn how to build a Pattern Maker app using Flutter, where you can design unique patterns by selecting rows, columns, and colors. This project introduces loops, user input handling, and dynamic UI updates.
3.2.4 Mini Project: Pattern Maker
Welcome to the exciting world of pattern creation! In this mini-project, you’ll learn how to build a Pattern Maker app using Flutter. This app will allow you to design your own patterns by choosing the number of rows and columns, as well as selecting colors. Let’s dive into the world of loops, user inputs, and dynamic UI updates!
Objective
The goal of this project is to apply your knowledge of loops and styling in Flutter to create a fun and interactive Pattern Maker app. You’ll learn how to handle user inputs and dynamically update the UI to display beautiful patterns.
Project Overview
In this project, you’ll build an app where users can:
- Choose the number of rows and columns for their pattern.
- Select a color for the pattern.
- Generate and display the pattern on the screen.
Step-by-Step Guide
Let’s break down the process of building the Pattern Maker app into manageable steps:
1. Set Up the UI
First, we’ll create the user interface (UI) for our app. This includes input fields for the number of rows and columns, as well as color pickers for selecting the pattern color.
2. Create Variables
Next, we’ll declare variables to store the user inputs. These variables will help us generate the pattern based on the user’s choices.
3. Generate Pattern
Using loops, we’ll create the pattern by iterating over the number of rows and columns specified by the user. This is where the magic of loops comes into play!
4. Display Pattern
Finally, we’ll display the generated pattern on the screen, allowing users to see their creations come to life.
Code Example
Here’s a complete code example to help you build the Pattern Maker app:
import 'package:flutter/material.dart';
void main() {
runApp(PatternMakerApp());
}
class PatternMakerApp extends StatefulWidget {
@override
_PatternMakerAppState createState() => _PatternMakerAppState();
}
class _PatternMakerAppState extends State<PatternMakerApp> {
int rows = 3;
int cols = 3;
Color selectedColor = Colors.blue;
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('Pattern Maker'),
),
body: Padding(
padding: EdgeInsets.all(16.0),
child: Column(
children: [
TextField(
decoration: InputDecoration(labelText: 'Number of Rows'),
keyboardType: TextInputType.number,
onChanged: (value) {
setState(() {
rows = int.parse(value);
});
},
),
TextField(
decoration: InputDecoration(labelText: 'Number of Columns'),
keyboardType: TextInputType.number,
onChanged: (value) {
setState(() {
cols = int.parse(value);
});
},
),
SizedBox(height: 10),
Row(
children: [
Text('Select Color: '),
DropdownButton<Color>(
value: selectedColor,
items: Colors.primaries.map((Color color) {
return DropdownMenuItem<Color>(
value: color,
child: Container(
width: 24,
height: 24,
color: color,
),
);
}).toList(),
onChanged: (Color? newColor) {
setState(() {
selectedColor = newColor!;
});
},
),
],
),
SizedBox(height: 20),
ElevatedButton(
onPressed: () {
setState(() {}); // Refresh the UI to display the pattern
},
child: Text('Create Pattern'),
),
SizedBox(height: 20),
Expanded(
child: GridView.builder(
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: cols,
),
itemCount: rows * cols,
itemBuilder: (context, index) {
return Container(
margin: EdgeInsets.all(2),
color: selectedColor,
);
},
),
),
],
),
),
),
);
}
}
Visuals
To help you understand the flow of the Pattern Maker app, here’s a Mermaid.js diagram outlining the process:
flowchart TD
A[Start] --> B[User Inputs Rows and Columns]
B --> C[Select Color]
C --> D[Press 'Create Pattern']
D --> E[Generate Pattern with Loops]
E --> F[Display Pattern]
F --> G[End]
Language and Engagement
This project is all about creativity and fun! As you build your Pattern Maker app, feel free to experiment with different settings to see what unique designs you can create. Encourage your friends to try it out and share their patterns too!
Best Practices and Tips
- Error Handling: Make sure to handle cases where users might input invalid numbers or leave fields empty.
- UI Design: Keep the interface simple and intuitive. Use clear labels and buttons to guide users.
- Experimentation: Encourage kids to try different combinations of rows, columns, and colors to see how the patterns change.
Conclusion
Congratulations on building your very own Pattern Maker app! You’ve learned how to use loops and user inputs to create dynamic and interactive designs. Keep experimenting and have fun creating new patterns!
