Blog - Flutterexperts

easy_audio_trimmer | Flutter Package
A Flutter package for trimming audio. This supports retrieving, trimming, and storing trimmed audio files in the…pub.dev

What Is Sealed Classes?:

Sealed is a new modifier that was added in Dart 3. It can be applied to define a class or type with a restricted list of subtypes. We would like to create a class called Color, for instance. The Green, Blue, and Red classes are the only three that can be subtypes of the Color class.

Adding a sealed modifier to the Color class is the answer. The class cannot be expanded upon or used outside of its library with that modifier applied. Sealed classes are also inherently abstract.

Subclasses:

Every subclass needs to be defined in the same file, or the same library. An example of declaring the Color class and its subclasses is provided below.

sealed class Color {}

class Green extends Color {}

class Blue extends Color {}

class Red extends Color {
final String name;

Red(this.name);
}

The compiler will raise an error if you attempt to define a class in another file that extends the Color class.

class Item extends Color {}

Instances:

A sealed class’s constructor cannot be used to create an instance since it is implicitly abstract.

Color color = Color();

A sealed class’s subclasses are not inherently abstract. As a result, to create instances, you must use the constructor of the subclasses.

Green myGreen = Green();
Blue myBlue = Blue();
Red myRed = Red('flutterdevs.com');

Constructors:

Constructors defined by a sealed class are accessible to its subclasses. For instance, we add a field called id to the Color class mentioned above. A constructor exists that takes in the value of id. I included a print statement to make it simpler to determine whether the constructor is called when from the subclasses.

sealed class Color {

String id;

Color(this.id) {
print('Creating a color');
}
}

class Green extends Color {
Green(super.id);
}

class Blue extends Color {
Blue(super.id);
}

class Red extends Color {
final String name;

Red(String id, this.name) : super(id) {
print('Creating a red');
}
}

The ‘Creating a color’ text should appear when you attempt to create an instance of the subclass using the code mentioned above.

Additionally, some factory constructors can be defined.

sealed class Color {

String id;

Color(this.id) {
print('Creating a color');
}

factory Color.createByType(String type, String id) {
if (type == "green") {
return Green(id);
} else if (type == "blue") {
return Blue(id);
} else if (type == "red") {
return Red(id, 'flutterdevs.com');
}

throw UnsupportedError('Unknown type');
}
}

Switch Cases Expression Checking:

To determine whether an object is an instance of a specific class, you can construct a switch case in the Dart programming language. The compiler can notify you if a switch block isn’t handling every possible subtype because a sealed class has a known list of subtypes.

The switch block in the example below doesn’t handle the case in which the passed object is Red. Consequently, an error stating that the switch cases do not fully match the type will be displayed.

String getColorVoice(Color color) {
// ERROR: The type 'Color' is not exhaustively matched by the switch cases since it doesn't match 'Goat()'
return switch (color) {
Green() => 'light',
Blue() => 'dark',
};
}

Conclusion:

In the article, I have explained the Sealed Classes In Dart; you can modify this code according to your choice. This was a small introduction to Sealed Classes In Dart User Interaction from my side, and it’s working using Flutter.

I hope this blog will provide you with sufficient information on Trying the Sealed Classes In Dart of your projects. If you want to define a class whose list of subtypes is predetermined and cannot be altered later, you should use Dart’s sealed modifier. The same library (file) must declare the list of subtypes.

Classes that are sealed cannot be instantiated and are implicitly abstract. You can, however, include factory constructors and other constructors. When you construct a switch block with a sealed class as the checked object type, the compiler can determine whether the switch cases have already exhaustively matched the type.

❤ ❤ Thanks for reading this article ❤❤

If I got something wrong? Let me know in the comments. I would love to improve.

Clap 👏 If this article helps you.

From Our Parent Company Aeologic

Aeologic Technologies is a leading AI-driven digital transformation company in India, helping businesses unlock growth with AI automation, IoT solutions, and custom web & mobile app development. We also specialize in AIDC solutions and technical manpower augmentation, offering end-to-end support from strategy and design to deployment and optimization.

Trusted across industries like manufacturing, healthcare, logistics, BFSI, and smart cities, Aeologic combines innovation with deep industry expertise to deliver future-ready solutions.

Feel free to connect with us:
And read more articles from FlutterDevs.com.

FlutterDevs team of Flutter developers to build high-quality and functionally-rich apps. Hire a Flutter developer for your cross-platform Flutter mobile app project on an hourly or full-time basis as per your requirement! For any flutter-related queries, you can connect with us on Facebook, GitHub, Twitter, and LinkedIn.

We welcome feedback and hope that you share what you’re working on using #FlutterDevs. We truly enjoy seeing how you use Flutter to build beautiful, interactive web experiences.

Implement Audio Trimmer In Flutter

Developers

Shaiq Khan

-

March 5, 2024

0

In this article, we will explore the Implement Audio Trimmer In Flutter. We perceive how to execute a demo program. We will show you how to trim audio files and save the trimmed audio files to the device utilizing the easy_audio_trimmer package in your Flutter applications.

For easy_audio_trimmer:

For file_picker:

file_picker | Flutter Package
A package that allows you to use a native file explorer to pick single or multiple absolute file paths, with extension…pub.dev

If you’re looking for the best Flutter app development company for your mobile application then feel free to contact us at — support@flutterdevs.com.

Table Of Contents::

Implementation

Code File

Introduction:

An audio trimmer is an audio editor intended to cut, trim, or split audio parts. It permits you to eliminate undesirable parts from your audio clips and save the subsequent piece of the audio in different audio files organizations like MP3, WAV, AAC, FLAC, OGG, and WMA.

Audio trimmers fill a crucial need empowering clients to cut and refine audio cuts as per their inclinations. This usefulness tracks down applications in different situations, including making tweaked ringtones, altering, or just extricating important parts from extended recordings.

This demo video shows how to implement Audio Trimmer in Flutter and how Audio Trimmer will work using the easy_audio_trimmer package and in your Flutter applications. We will show you the simplest way to trim and save audio files on your device.

Demo Module::

Implementation:

Step 1: Add the dependencies

Add dependencies to pubspec — yaml file.

dependencies:
flutter:
sdk: flutter
easy_audio_trimmer: ^1.0.2+4
file_picker: ^6.1.1

Step 2: Import

import 'package:easy_audio_trimmer/easy_audio_trimmer.dart';
import 'package:file_picker/file_picker.dart';

Step 3: Run flutter packages get in the root directory of your app.

Step 4: While running on the Android platform if it gives an error that minSdkVersion needs to be 24, or on the iOS platform that the Podfile platform version should be 11

How to implement code in dart file :

You need to implement it in your code respectively:

Create a new dart file called `main.dart` inside the `lib` folder.

In this dart file, we will create a new class AudioTrimmerDemo(). In this class, will add an ElevatedButton(). In this button, we will add the text “Select File” to its child function, and on the onPressed function, we will add the pick-up audio file function.

Center(
child: ElevatedButton(
style:
ElevatedButton.styleFrom(backgroundColor: Colors.teal.shade50),
onPressed: () async {
FilePickerResult? result = await FilePicker.platform.pickFiles(
type: FileType.audio,
allowCompression: false,
);
if (result != null) {
File file = File(result.files.single.path!);
Navigator.of(context).push(
MaterialPageRoute(builder: (context) {
return AudioTrimmerViewDemo(file);
}),
);
}
},
child: const Text(
"Select File",
style: TextStyle(color: Colors.teal),
)),
),

When we run the application, we ought to get the screen’s output like the underneath screen capture.

In the same dart file, we will create another new class AudioTrimmerViewDemo().

In this class, we will create a final Trimmer variable which is _trimmer is equal to Trimmer(). We will create two double variables _startValue and _endValue equal to 0.0. Also, we will create a three-bool variable was _isPlaying, _progressVisibility, and isLoading equal to false.

final Trimmer _trimmer = Trimmer();
double _startValue = 0.0;
double _endValue = 0.0;
bool _isPlaying = false;
bool _progressVisibility = false;
bool isLoading = false;

We will create an initState() method. In this method, we will add a _loadAudio() method. In this method, we will load the trimmer audio files.

@override
void initState() {
super.initState();
_loadAudio();
}
void _loadAudio() async {
setState(() {
isLoading = true;
});
await _trimmer.loadAudio(audioFile: widget.file);
setState(() {
isLoading = false;
});
}

We will create a _saveAudio method. In this method, we will save trimmed audio files.

_saveAudio() {
setState(() {
_progressVisibility = true;
});
_trimmer.saveTrimmedAudio(
startValue: _startValue,
endValue: _endValue,
audioFileName: DateTime.now().millisecondsSinceEpoch.toString(),
onSave: (outputPath) {
setState(() {
_progressVisibility = false;
});
debugPrint('OUTPUT PATH: $outputPath');
},
);
}

In the body part, we will create an audio trimmer view using the TrimViewer() method. In this method, we will set backgroundColor, barColor, viewerHeight, onChangeStart, etc.

Center(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: TrimViewer(
trimmer: _trimmer,
viewerHeight: 100,
viewerWidth: MediaQuery.of(context).size.width,
durationStyle: DurationStyle.FORMAT_MM_SS,
backgroundColor:Colors.teal,
barColor: Colors.white,
durationTextStyle: const TextStyle(
color: Colors.teal),
allowAudioSelection: true,
editorProperties: const TrimEditorProperties(
circleSize: 10,
borderPaintColor: Colors.red,
borderWidth: 4,
borderRadius: 5,
circlePaintColor: Colors.redAccent,
),
areaProperties:
TrimAreaProperties.edgeBlur(blurEdges:true),
onChangeStart: (value) => _startValue = value,
onChangeEnd: (value) => _endValue = value,
onChangePlaybackState: (value) {
if (mounted) {
setState(() => _isPlaying = value);
}
},
),
),
),

Also, we will add the TextButton() method. In this method, we will add play and pause button functions.

TextButton(
child: _isPlaying
? const Icon(
Icons.pause,
size: 80.0,
color: Colors.teal,
)
: const Icon(
Icons.play_arrow,
size: 80.0,
color: Colors.teal,
),
onPressed: () async {
bool playbackState =
await _trimmer.audioPlaybackControl(
startValue: _startValue,
endValue: _endValue,
);
setState(() => _isPlaying = playbackState);
},
),

Also, we will add the Visibility() method. In this method, we will add LinearProgressIndicator(). This method will work on the save button only. When the user presses save the audio then the LinearProgressIndicator will be shown.

Visibility(
visible: _progressVisibility,
child: LinearProgressIndicator(
backgroundColor:
Theme.of(context).primaryColor.withOpacity(0.5),
),
),
ElevatedButton(
style:
ElevatedButton.styleFrom(backgroundColor: Colors.teal.shade50),
onPressed:
_progressVisibility ? null : () =>_saveAudio(),
child: const Text("SAVE",style: TextStyle(color: Colors.teal)),
),

When we run the application, we ought to get the screen’s output like the underneath screen capture.

Code File:

import 'dart:io';
import 'package:easy_audio_trimmer/easy_audio_trimmer.dart';
import 'package:file_picker/file_picker.dart';
import 'package:flutter/material.dart';

void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return const MaterialApp(
title: 'Flutter Demo',
debugShowCheckedModeBanner: false,
home: AudioTrimmerDemo(),
);
}
}
class AudioTrimmerDemo extends StatefulWidget {
const AudioTrimmerDemo({super.key});
@override
State<AudioTrimmerDemo> createState() => _AudioTrimmerDemoState();
}
class _AudioTrimmerDemoState extends State<AudioTrimmerDemo> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
automaticallyImplyLeading: false,
centerTitle: true,
title: const Text(
"Flutter Audio Trimmer Demo",
style: TextStyle(color: Colors.white),
),
backgroundColor: Colors.teal,
),
body: Center(
child: ElevatedButton(
style:
ElevatedButton.styleFrom(backgroundColor: Colors.teal.shade50),
onPressed: () async {
FilePickerResult? result = await FilePicker.platform.pickFiles(
type: FileType.audio,
allowCompression: false,
);
if (result != null) {
File file = File(result.files.single.path!);
Navigator.of(context).push(
MaterialPageRoute(builder: (context) {
return AudioTrimmerViewDemo(file);
}),
);
}
},
child: const Text(
"Select File",
style: TextStyle(color: Colors.teal),
)),
),
);
}
}
class AudioTrimmerViewDemo extends StatefulWidget {
final File file;
const AudioTrimmerViewDemo(this.file, {Key? key}) : super(key: key);
@override
State<AudioTrimmerViewDemo> createState() => _AudioTrimmerViewDemoState();
}
class _AudioTrimmerViewDemoState extends State<AudioTrimmerViewDemo> {
final Trimmer _trimmer = Trimmer();
double _startValue = 0.0;
double _endValue = 0.0;
bool _isPlaying = false;
bool _progressVisibility = false;
bool isLoading = false;
@override
void initState() {
super.initState();
_loadAudio();
}
void _loadAudio() async {
setState(() {
isLoading = true;
});
await _trimmer.loadAudio(audioFile: widget.file);
setState(() {
isLoading = false;
});
}
_saveAudio() {
setState(() {
_progressVisibility = true;
});
_trimmer.saveTrimmedAudio(
startValue: _startValue,
endValue: _endValue,
audioFileName: DateTime.now().millisecondsSinceEpoch.toString(),
onSave: (outputPath) {
setState(() {
_progressVisibility = false;
});
debugPrint('OUTPUT PATH: $outputPath');
},
);
}
@override
Widget build(BuildContext context) {
return WillPopScope(
onWillPop: () async {
if (Navigator.of(context).userGestureInProgress) {
return false;
} else {
return true;
}
},
child: Scaffold(
backgroundColor: Colors.white,
appBar: AppBar(
centerTitle: true,
title: const Text(
"Flutter Audio Trimmer Demo",
style: TextStyle(color: Colors.white),
),
backgroundColor: Colors.teal,
),
body: isLoading
? const Center(child: CircularProgressIndicator())
: Center(
child: Container(
padding: const EdgeInsets.only(bottom: 30.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.max,
children: <Widget>[
Center(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: TrimViewer(
trimmer: _trimmer,
viewerHeight: 100,
viewerWidth: MediaQuery.of(context).size.width,
durationStyle: DurationStyle.FORMAT_MM_SS,
backgroundColor:Colors.teal,
barColor: Colors.white,
durationTextStyle: const TextStyle(
color: Colors.teal),
allowAudioSelection: true,
editorProperties: const TrimEditorProperties(
circleSize: 10,
borderPaintColor: Colors.red,
borderWidth: 4,
borderRadius: 5,
circlePaintColor: Colors.redAccent,
),
areaProperties:
TrimAreaProperties.edgeBlur(blurEdges:true),
onChangeStart: (value) => _startValue = value,
onChangeEnd: (value) => _endValue = value,
onChangePlaybackState: (value) {
if (mounted) {
setState(() => _isPlaying = value);
}
},
),
),
),
TextButton(
child: _isPlaying
? const Icon(
Icons.pause,
size: 80.0,
color: Colors.teal,
)
: const Icon(
Icons.play_arrow,
size: 80.0,
color: Colors.teal,
),
onPressed: () async {
bool playbackState =
await _trimmer.audioPlaybackControl(
startValue: _startValue,
endValue: _endValue,
);
setState(() => _isPlaying = playbackState);
},
),
Visibility(
visible: _progressVisibility,
child: LinearProgressIndicator(
backgroundColor:
Theme.of(context).primaryColor.withOpacity(0.5),
),
),
ElevatedButton(
style:
ElevatedButton.styleFrom(backgroundColor: Colors.teal.shade50),
onPressed:
_progressVisibility ? null : () =>_saveAudio(),
child: const Text("SAVE",style: TextStyle(color: Colors.teal)),
),
],
),
),
),
),
);
}
}

Conclusion:

In the article, I have explained the Audio Trimmer In Flutter; you can modify this code according to your choice. This was a small introduction to the Audio Trimmer In Flutter User Interaction from my side, and it’s working using Flutter.

I hope this blog will provide you with sufficient information on Trying the Audio Trimmer in your Flutter projects. We will show you what the Introduction is. Make a demo program for working on Audio Trimmer in your Flutter applications. So please try it.

❤ ❤ Thanks for reading this article ❤❤

If I need to correct something? Let me know in the comments. I would love to improve.

Clap 👏 If this article helps you.

From Our Parent Company Aeologic

Aeologic Technologies is a leading AI-driven digital transformation company in India, helping businesses unlock growth with AI automation, IoT solutions, and custom web & mobile app development. We also specialize in AIDC solutions and technical manpower augmentation, offering end-to-end support from strategy and design to deployment and optimization.

Trusted across industries like manufacturing, healthcare, logistics, BFSI, and smart cities, Aeologic combines innovation with deep industry expertise to deliver future-ready solutions.

Feel free to connect with us:
And read more articles from FlutterDevs.com.

FlutterDevs team of Flutter developers to build high-quality and functionally-rich apps. Hire a Flutter developer for your cross-platform Flutter mobile app project on an hourly or full-time basis as per your requirement! For any flutter-related queries, you can connect with us on Facebook, GitHub, Twitter, and LinkedIn.

We welcome feedback and hope that you share what you’re working on using #FlutterDevs. We truly enjoy seeing how you use Flutter to build beautiful, interactive web experiences.

Parallax Effect With PageView In Flutter

Animation

Shaiq Khan

-

March 5, 2024

0

In this article, we will explore the Parallax Effect With PageView In Flutter. We see how to execute a demo program. Using a single background image scrolling in your Flutter applications, we will tell you how to create a parallax effect with pageview.

If you’re looking for the best Flutter app development company for your mobile application then feel free to contact us at — support@flutterdevs.com.

Table Of Contents::

Code File

Introduction

The below demo video shows how to create a parallax effect with pageview in Flutter and how a parallax effect will work on pageview using a single background image in your Flutter applications. We will show a single image background scrolling using the parallax effect. It will be shown on your device.

Demo Module::

Code Implement:

Create a new dart file called DataImage.dart inside the lib folder.

In this class, we will add three parameters pageCount, screenSize, and offset. We will return the Sizebox with height and width and child we will add an image with alignment and fit.

class DataImage extends StatelessWidget {
  const DataImage({
    Key? key,
    required this.pageCount,
    required this.screenSize,
    required this.offset,
  }) : super(key: key);

  final Size screenSize;
  final int pageCount;
  final double offset;

  @override
  Widget build(BuildContext context) {
    int lastPageIdx = pageCount - 1;
    int firstPageIdx = 0;
    int alignmentMax = 1;
    int alignmentMin = -1;
    int pageRange = (lastPageIdx - firstPageIdx) - 1;
    int alignmentRange = (alignmentMax - alignmentMin);
    double alignment = (((offset - firstPageIdx) * alignmentRange) / pageRange) + alignmentMin;

    return SizedBox(
      height: screenSize.height,
      width: screenSize.width,
      child: Image(
        image: const AssetImage('assets/images/living_room.jpg'),
        alignment: Alignment(alignment, 0),
        fit: BoxFit.fitHeight,
      ),
    );
  }
}

Create a new dart file called Item.dart inside the lib folder.

In this class, we will add one parameter was string title. We will add a list of item variables was screens. We will add four data items.

class Item {
  const Item({required this.title,});
  final String title;
}

const List<Item> screens = [
  Item(title: 'Flower Pot',),
  Item(title: 'Chair',),
  Item(title: 'Wall Painting'),
  Item(title: 'Table', ),
  Item(title: 'Sofa',),
];

Create a new dart file called main.dart inside the lib folder.

In the main .dart file. We will create a new class ParallaxDemo(). In this class, we will define a late PageController variable as _pageController and late double _pageOffset.

late PageController _pageController;
late double _pageOffset;

Now, we will create a dispose() method. in this method, we will add a variable of page Controller was _pageController.dispose().

@override
void dispose() {
_pageController.dispose();
super.dispose();
}
}

In the body, we will add a Stack widgte. in this widget. We will add a DataImage() class. In this class, we will add pageCount is screens.length+1, screenSize and offset is _pageOffset. Also we wii add a PageView() method. In this method, we will add controller is _pageController. In children, we will add items.map() navigate a column widget.

Stack(
        children: [
          DataImage(
            pageCount: items.length + 1,
            screenSize: MediaQuery.of(context).size,
            offset: _pageOffset,
          ),
          PageView(
            controller: _pageController,
            children: [
              ...items
                  .map((item) => Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Container(
                    padding: const EdgeInsets.all(10),
                    color: Colors.black.withOpacity(0.7),
                    child: Text(
                      item.title,
                      style: const TextStyle(
                        color: Colors.white,
                        fontSize: 30,
                      ),
                    ),
                  ),

                ],
              ))
                  .toList(),
            ],
          ),
        ],
      ),

In this widget, we will add Container with the padding, color and its child we will add item.tittle.

When we run the application, we ought to get the screen’s output like the underneath screen capture.

Code File:

import 'package:flutter/material.dart';
import 'package:flutter_parallax_effect_page_view_demo/splash_screen.dart';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) => MaterialApp(
    debugShowCheckedModeBanner: false,
    theme: ThemeData(primarySwatch: Colors.blue),
    home: const Splash(),
  );
}

class ParallaxDemo extends StatefulWidget {
  const ParallaxDemo({super.key});

  @override
  _ParallaxDemoState createState() => _ParallaxDemoState();
}

class _ParallaxDemoState extends State<ParallaxDemo> {
  late PageController _pageController;
  late double _pageOffset;

  @override
  void initState() {
    super.initState();
    _pageOffset = 0;
    _pageController = PageController(initialPage: 0);
    _pageController.addListener(
          () => setState(() => _pageOffset = _pageController.page ?? 0),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        automaticallyImplyLeading: false,
        title: const Text("Flutter Parallax Effect with PageView Demo",style: TextStyle(fontSize: 18),),
        backgroundColor: Colors.orange,
        centerTitle: true,
      ),
      body: Stack(
        children: [
          DataImage(
            pageCount: items.length + 1,
            screenSize: MediaQuery.of(context).size,
            offset: _pageOffset,
          ),
          PageView(
            controller: _pageController,
            children: [
              ...items
                  .map((item) => Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Container(
                    padding: const EdgeInsets.all(10),
                    color: Colors.black.withOpacity(0.7),
                    child: Text(
                      item.title,
                      style: const TextStyle(
                        color: Colors.white,
                        fontSize: 30,
                      ),
                    ),
                  ),

                ],
              ))
                  .toList(),
            ],
          ),
        ],
      ),
    );
  }

  @override
  void dispose() {
    _pageController.dispose();
    super.dispose();
  }
}

class DataImage extends StatelessWidget {
  const DataImage({
    Key? key,
    required this.pageCount,
    required this.screenSize,
    required this.offset,
  }) : super(key: key);

  final Size screenSize;
  final int pageCount;
  final double offset;

  @override
  Widget build(BuildContext context) {
    int lastPageIdx = pageCount - 1;
    int firstPageIdx = 0;
    int alignmentMax = 1;
    int alignmentMin = -1;
    int pageRange = (lastPageIdx - firstPageIdx) - 1;
    int alignmentRange = (alignmentMax - alignmentMin);
    double alignment = (((offset - firstPageIdx) * alignmentRange) / pageRange) + alignmentMin;

    return SizedBox(
      height: screenSize.height,
      width: screenSize.width,
      child: Image(
        image: const AssetImage('assets/images/living_room.jpg'),
        alignment: Alignment(alignment, 0),
        fit: BoxFit.fitHeight,
      ),
    );
  }
}

class Item {
  const Item({required this.title,});
  final String title;
}

const List<Item> items = [
  Item(title: 'Flower Pot',),
  Item(title: 'Chair',),
  Item(title: 'Wall Painting'),
  Item(title: 'Table', ),
  Item(title: 'Sofa',),
];

Conclusion:

In the article, I have explained the Parallax Effect With PageView in Flutter; you can modify this code according to your choice. This was a small introduction to the Parallax Effect With PageView In Flutter User Interaction from my side, and it’s working using Flutter.

I hope this blog will provide you with sufficient information on Trying Parallax Effect With PageView in your Flutter projects. We will show you what the Introduction is. Make a demo program for working on the Parallax Effect With PageView using the single background imge scrolling in your Flutter applications. So please try it.

❤ ❤ Thanks for reading this article ❤❤

If I need to correct something? Let me know in the comments. I would love to improve.

Clap 👏 If this article helps you.

From Our Parent Company Aeologic

Aeologic Technologies is a leading AI-driven digital transformation company in India, helping businesses unlock growth with AI automation, IoT solutions, and custom web & mobile app development. We also specialize in AIDC solutions and technical manpower augmentation, offering end-to-end support from strategy and design to deployment and optimization.

Trusted across industries like manufacturing, healthcare, logistics, BFSI, and smart cities, Aeologic combines innovation with deep industry expertise to deliver future-ready solutions.

Feel free to connect with us:
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Custom Paint with Flutter

Tools

Shaiq Khan

-

March 4, 2024

0

In this article, we will explore the Custom Paint with Flutter. We perceive how to execute a demo program. We will tell you the best way to create modified shapes, and sizes of the widgets using custom paint, and how to use it in your Flutter applications.

If you’re looking for the best Flutter app development company for your mobile application then feel free to contact us at — support@flutterdevs.com.

Table Of Contents::

Constructor

Properties

Code File

Introduction:

CustomPaint is a widget that gives a material on which to draw during the paint stage. It essentially guarantees the UI planning of those parts that can’t be gotten from the ordinary shapes given by Flutter. This widget shows the adaptability of Flutter to its peers.

This demo ui shows how to create a customized shape in Flutter and how shapes will work using the custom paint widget in your Flutter applications. We will show you a two-draw shape of is circle and line on your device.

Demo Ui Module::

Constructor:

To utilize CustomPaint, you need to call the constructor underneath:

CustomPaint({
super.key,
this.painter,
this.foregroundPainter,
this.size = Size.zero,
this.isComplex = false,
this.willChange = false,
super.child,
})

Properties:

There are some properties of CustomPaint:

> child: This property is used to the child holds whatever widget is needed to create the CustomPaint.
> foregroundPainter: This property is utilized by the painter who paints after the children. Likewise, it takes a class that extends the class CustomPaint.
> key: This property is used to control how one widget replaces another widget in the tree.
> painter: This property is utilized by the painter who paints before the child. Here you would have to make a class that extends the class CustomPaint.
> size: This property is used by the size of this CustomPaint, at first size is equivalent to Size.zero which implies if you don’t characterize a size or child, then the CustomPaint won’t show.
> willChange: This property is utilized to the whether the raster reserve ought to be informed that this painting is probably going to change in the following frame.

How to implement code in dart file :

You need to implement it in your code respectively:

Create a new dart file called `custom_circle.dart` inside the `lib` folder.

To have the option to utilize the CustomPaint widget, you want to make a class that extends the CustomPaint. The class would need to execute two strategies paint() and shouldRepaint(). You can draw a circle by calling the strategy drawCircle() on the canvas object:

import 'package:flutter/material.dart';class CustomCircle extends CustomPainter {
@override
void paint(Canvas canvas, Size size) {
Paint paint = Paint();
paint.color = Colors.teal.shade300;
paint.style = PaintingStyle.fill;
paint.strokeCap = StrokeCap.round;
paint.strokeJoin = StrokeJoin.round;Offset offset = Offset(size.width * 0.5, size.height);
canvas.drawCircle(offset, 50, paint);
}@override
bool shouldRepaint(covariant CustomPainter oldDelegate) {
return false;
}
}

If we check the code above, first, we are utilizing the Paint class, which is utilized to style the canvas. We furnished it with teal.shade300, the painting style is filled, strokeCap was round, strokeJoin was likewise round, offset we will add width and height. We call the strategy drawCircle and pass to it the contentions offset, 50, and paint.

We will pass the above method into a customPaint widget:

CustomPaint(
painter: CustomCircle(),
child: SizedBox(
width: MediaQuery.of(context).size.width * 0.5,
height: MediaQuery.of(context).size.height * 0.1,
),
),

When we run the application, we ought to get the screen’s output like the underneath screen capture.

Create a new dart file called `custom_line.dart` inside the `lib` folder.

To define a line alone, you want to likewise utilize the CustomPaint widget, and make another class CustomLine that extends the CustomPaint class. Here we likewise utilize the Paint object to style the CustomLine and we provide it with a width of 8. Then we want to make a starting point and an ending point that would be utilized to mirror the start of the line and the end.

import 'package:flutter/material.dart';class CustomLine extends CustomPainter {
@override
void paint(Canvas canvas, Size size) {
Paint paint = Paint();
paint.color = Colors.teal;
paint.strokeWidth = 8;
paint.strokeCap = StrokeCap.round;Offset startingOffset = Offset(0, size.height);
Offset endingOffset = Offset(size.width, size.height);canvas.drawLine(startingOffset, endingOffset, paint);
}@override
bool shouldRepaint(covariant CustomPainter oldDelegate) {
return false;
}
}

In this way, we determine that the starting point should begin at the X-axis with coordinate 0 and the y-axis with the most extreme height while the endpoint should need to organize the greatest width as the X-axis and most extreme height as the y-axis consequently making a straight even line. We call the system drawLine and pass to it the disputes startingOffset, endingOffset, and paint.

Again we will pass the other above method into a customPaint widget:

CustomPaint(
painter: CustomLine(),
child: SizedBox(
width: MediaQuery.of(context).size.width * 0.7,
height: MediaQuery.of(context).size.height * 0.08,
),
),

When we run the application, we ought to get the screen’s output like the underneath screen capture.

Code File:

import 'package:flutter/material.dart';
import 'package:flutter_custom_paint/custom_circle.dart';
import 'package:flutter_custom_paint/custom_line.dart';void main() {
runApp(const MyApp());
}class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
theme: ThemeData(
primarySwatch: Colors.green,
),
home: const CustomPaintDemo());
}
}class CustomPaintDemo extends StatefulWidget {
const CustomPaintDemo({Key? key}) : super(key: key);@override
_CustomPaintDemoState createState() => _CustomPaintDemoState();
}class _CustomPaintDemoState extends State<CustomPaintDemo> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text("Flutter Custom Paint Demo"),
centerTitle: true,
),
body: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Center(
child: CustomPaint(
painter: CustomCircle(),
child: SizedBox(
width: MediaQuery.of(context).size.width * 0.5,
height: MediaQuery.of(context).size.height * 0.1,
),
),
),
Center(
child: CustomPaint(
painter: CustomLine(),
child: SizedBox(
width: MediaQuery.of(context).size.width * 0.7,
height: MediaQuery.of(context).size.height * 0.08,
),
),
),
],
),
);
}
}

Conclusion:

In the article, I have explained the Custom Paint With Flutter; you can modify this code according to your choice. This was a small introduction to the Custom Paint With Flutter User Interaction from my side, and it’s working using Flutter.

I hope this blog will provide you with sufficient information on Trying Custom Paint in your Flutter projects. We will show you what the Introduction is. Make a demo program for working on Custom Paint and how to create and use it in your Flutter applications. So please try it.

❤ ❤ Thanks for reading this article ❤❤

If I need to correct something? Let me know in the comments. I would love to improve.

Clap 👏 If this article helps you.

From Our Parent Company Aeologic

Aeologic Technologies is a leading AI-driven digital transformation company in India, helping businesses unlock growth with AI automation, IoT solutions, and custom web & mobile app development. We also specialize in AIDC solutions and technical manpower augmentation, offering end-to-end support from strategy and design to deployment and optimization.

Trusted across industries like manufacturing, healthcare, logistics, BFSI, and smart cities, Aeologic combines innovation with deep industry expertise to deliver future-ready solutions.

Feel free to connect with us:
And read more articles from FlutterDevs.com.

FlutterDevs team of Flutter developers to build high-quality and functionally rich apps. Hire a Flutter developer for your cross-platform Flutter mobile app project on an hourly or full-time basis as per your requirement! For any flutter-related queries, you can connect with us on Facebook, GitHub, Twitter, and LinkedIn.

We welcome feedback and hope that you share what you’re working on using #FlutterDevs. We truly enjoy seeing how you use Flutter to build beautiful, interactive web experiences.

OverlayPortal In Flutter

Widgets

Shaiq Khan

-

March 4, 2024

0

In this article, we will explore the OverlayPortal In Flutter. We perceive how to execute a demo program. We will tell you the best way to use OverlayPortal in your Flutter applications. It is another Flutter widget presented after Flutter version 3.10.

If you’re looking for the best Flutter app development company for your mobile application then feel free to contact us at — support@flutterdevs.com.

Table Of Contents::

Constructor

Properties

Code File