surav 1.0.21+2

The Quick utilities for flutter app

Surav Usage Guide

This guide provides an overview of how to use the ApiRequest class and the SuravLocal class for making HTTP requests and managing local data storage in a Flutter application using the Dio package.

Table of Contents

• Installation
• Usage
  • Creating an ApiRequest
  • Sending Requests
  • Handling Responses
  • Logging
• SuravLocal Class
  • Setting Data
  • Getting Data
  • Clearing Data
• Additional Functions
  • packFormData
  • addFormFile
  • String Extensions
    • capitalize
    • getFileName
    • getTruncatedFilenameWithDots
    • getFileExtension
    • formatDate
    • lastCharacters
    • firstCharacters
  • Numeric Extensions
    • toMinutes
  • Validation Extensions
    • isValidEmail
    • isValidPhoneNumber
  • BuildContext Extensions
    • windowWidth
    • windowHeight
• Toast Utility
  • showToast
  • Navigation
  • Initialization
  • Showing Snackbars

Installation

To use the ApiRequest and SuravLocal classes, you need to include the following dependencies in your pubspec.yaml file:

dependencies:
  surav: ^1.0.21+2
  flutter:
    sdk: flutter

Run flutter pub get to install the dependencies.

Usage

Creating an ApiRequest

To create an instance of the ApiRequest class, you need to provide the URL and optional parameters such as method, body, options, and others.

ApiRequest request = ApiRequest(
  'https://example.com/api/endpoint',
  method: ApiMethod.POST,
  body: {'key': 'value'},
  showLogs: true, // Set to false to disable logging
);

Sending Requests

To send a request, use the send method. This method returns a Future<Response>.

Response response = await request.send();

Handling Responses

The send method returns a Dio Response object. You can handle the response as needed:

if (response.statusCode == 200) {
  // Handle success
  print(response.data);
} else {
  // Handle error
  print('Request failed with status: ${response.statusCode}');
}

Logging

Logging is handled by the Logger package. The logging behavior depends on the request method and whether logging is enabled.

• GET requests: Informational logs
• POST and DELETE requests: Warning logs
• Other methods: Fatal logs

Logs include stack traces for better debugging.

SuravLocal Class

The SuravLocal class provides methods for managing local data storage using the shared_preferences package.

Setting Data

To set a value in local storage, use one of the following methods:

await SuravLocal.setString('key', 'value');
await SuravLocal.setBool('key', true);
await SuravLocal.setInt('key', 123);
await SuravLocal.setDouble('key', 123.45);
await SuravLocal.setStringList('key', ['value1', 'value2']);

Getting Data

To retrieve a value from local storage, use one of the following methods:

String? stringValue = await SuravLocal.getString('key');
bool? boolValue = await SuravLocal.getBool('key');
int? intValue = await SuravLocal.getInt('key');
double? doubleValue = await SuravLocal.getDouble('key');
List<String>? stringListValue = await SuravLocal.getStringList('key');

Clearing Data

To remove a specific value or clear all data from local storage, use the following methods:

await SuravLocal.remove('key');
await SuravLocal.clear();

Additional Functions

packFormData

The packFormData function helps in packing data into a FormData object for multipart/form-data requests.

FormData formData = packFormData({
  'name': 'John Doe',
  'file': await addFormFile('/path/to/file'),
});

addFormFile

The addFormFile function helps in adding a file to the FormData.

MultipartFile file = await addFormFile('/path/to/file', filename: 'file.txt');

String Extensions

capitalize

Capitalizes the first letter of each word in a string.

String text = "hello world".capitalize();
// Output: "Hello World"

getFileName

Extracts the file name from a file path.

String fileName = "/path/to/file.txt".getFileName();
// Output: "file.txt"

getTruncatedFilenameWithDots

Truncates a file name to a maximum length of 22 characters, adding ".." if truncated.

String truncatedFileName = "/path/to/very_long_file_name.txt".getTruncatedFilenameWithDots();
// Output: "very_long_file_na..txt"

getFileExtension

Extracts the file extension from a file path.

String fileExtension = "/path/to/file.txt".getFileExtension();
// Output: "txt"

formatDate

Formats a date string in "YYYY-MM-DDTHH:MM:SS" format to "DD Mon YYYY".

String formattedDate = "2023-12-25T00:00:00".formatDate();
// Output: "25 Dec 2023"

lastCharacters

Gets the last n characters of a string.

String lastChars = "hello world".lastCharacters(5);
// Output: "world"

firstCharacters

Gets the first n characters of a string, followed by "...".

String firstChars = "hello world".firstCharacters(5);
// Output: "hello..."

Numeric Extensions

toMinutes

Converts seconds to minutes, rounded to 3 decimal places.

double minutes = 120.toMinutes();
// Output: 2.000

Validation Extensions

isValidEmail

Validates if a string is a valid email format.

bool isEmail = "[e-mail]".isValidEmail();
// Output: true

isValidPhoneNumber

Validates if a string is a valid phone number format.

bool isPhoneNumber = "[phone]".isValidPhoneNumber();
// Output: true

BuildContext Extensions

windowWidth

Gets the width of the window.

double width = context.windowWidth;

windowHeight

Gets the height of the window.

double height = context.windowHeight;

Toast Utility

showToast

Displays a toast message on the screen.

void showToast(
  String msg, {
  Toast toastLength = Toast.LENGTH_SHORT,
  ToastGravity gravity = ToastGravity.BOTTOM,
  int timeInSecForIosWeb = 1,
  Color backgroundColor = Colors.black,
  Color textColor = Colors.white,
  double fontSize = 16.0,
}) {
  Fluttertoast.cancel();
  Fluttertoast.showToast(
    msg: msg,
    toastLength: toastLength,
    gravity: gravity,
    timeInSecForIosWeb: timeInSecForIosWeb,
    backgroundColor: backgroundColor,
    textColor: textColor,
    fontSize: fontSize,
  );
}

Example

Here's a complete example demonstrating how to use

  ElevatedButton(
        onPressed: () => showToast('This is a toast message'),
        child: Text('Show Toast'),
    ),

Introduction

The SuravNavigate class provides global keys for managing navigation and snackbars within a Flutter application. It simplifies the process of navigating between screens and displaying snackbars from anywhere in the application.

Initialization

First, you need to initialize the SuravNavigate class in your MaterialApp widget. This ensures that the global keys are properly set up for managing navigation and snackbars.

import 'package:flutter/material.dart';
import 'surav_navigate.dart'; // Ensure this file includes the provided SuravNavigate class

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      navigatorKey: SuravNavigate.navigateKey,
      scaffoldMessengerKey: SuravNavigate.snackbarKey,
      home: HomeScreen(),
    );
  }
}

Navigation

To navigate to a new screen, you can use the navigate global instance. This allows you to perform navigation operations from anywhere in your code.

NavigatorState navigate = SuravNavigate.navigateKey.currentState!;

void navigateToScreen(Widget screen) {
  navigate.push(routeMe(screen));
}

Showing Snackbars

To show a snackbar, you can use the snackbarKey to get the current ScaffoldMessengerState.

void showSnackbar(String message) {
  SuravNavigate.snackbarKey.currentState!.showSnackBar(
    SnackBar(content: Text(message)),
  );
}

Utility Function

The routeMe function is a utility that creates a MaterialPageRoute for a given screen.

MaterialPageRoute routeMe(Widget screen) {
  return MaterialPageRoute(builder: (context) {
    return screen;
  });
}

Example

Here's a complete example demonstrating how to use the SuravNavigate class and its related utilities in a Flutter application:

import 'package:flutter/material.dart';
import 'surav_navigate.dart'; // Ensure this file includes the provided SuravNavigate class

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      navigatorKey: SuravNavigate.navigateKey,
      scaffoldMessengerKey: SuravNavigate.snackbarKey,
      home: HomeScreen(),
    );
  }
}

class HomeScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Home Screen')),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            ElevatedButton(
              onPressed: () {
                navigateToScreen(SecondScreen());
              },
              child: Text('Navigate to Second Screen'),
            ),
            ElevatedButton(
              onPressed: () {
                showSnackbar('This is a snackbar message');
              },
              child: Text('Show Snackbar'),
            ),
          ],
        ),
      ),
    );
  }
}

class SecondScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Second Screen')),
      body: Center(
        child: ElevatedButton(
          onPressed: () {
            navigate.pop();
          },
          child: Text('Go Back'),
        ),
      ),
    );
  }
}

void navigateToScreen(Widget screen) {
  NavigatorState navigate = SuravNavigate.navigateKey.currentState!;
  navigate.push(routeMe(screen));
}

void showSnackbar(String message) {
  SuravNavigate.snackbarKey.currentState!.showSnackBar(
    SnackBar(content: Text(message)),
  );
}

Make sure to save the provided SuravNavigate class in a file (e.g., surav_navigate.dart) and import it in your main file as shown in the example. This will enable you to utilize the navigation and snackbar functionalities across your Flutter application.