Flutter Blogs

The ExpansionTile widget in Flutter is a great tool for displaying a list of items that can expand or collapse. This widget is useful for creating expandable/collapsible sections within your app, often used for things like FAQs, menus, or lists with hidden details. In this blog post, we'll take an in-depth look at the properties of the ExpansionTile , demonstrate how to use it, and provide a few practical examples. Table of Contents What is an ExpansionTile? Properties of ExpansionTile Title Leading Trailing Children Initially Expanded On Expansion Changed Tile Padding Background Color Shape IconColor Example Usage of ExpansionTile Simple ExpansionTile Example ExpansionTile with Customization Using ExpansionTile with Nested Children Common Use Cases Conclusion 1. What is an ExpansionTile? The ExpansionTile widget in Flutter is used to create a list item that can expand or collapse to show more content. This is useful in cases where you want to hide or show content dynamically. Th...

Flutter's Scaffold widget is one of the most essential and commonly used widgets when developing applications. It provides a basic structure for building a visual layout, and it serves as the "skeleton" that holds many of your app's UI elements such as the AppBar, Drawer, Floating Action Button (FAB), Bottom Navigation Bar, and body content. What is a Scaffold in Flutter? The Scaffold widget is essentially a layout structure that helps you organize your app’s visual elements. It offers built-in support for several standard app features like the app bar, drawer, and floating action buttons, among others. Here’s an example of a basic Scaffold structure: import 'package:flutter/material.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( appBar: AppBar(title: Text('Flutter Scaffold Example')), body: Center(child...

In Flutter, the AppBar widget plays a crucial role in creating the top navigation bar for your mobile app. It’s a staple component for most apps, often used to display the app's title, navigation controls, and actions. Whether you're building simple apps or complex ones, understanding the properties and constructors of the AppBar widget is essential for creating polished and functional UIs. What is the AppBar Widget? An AppBar is a Material Design app bar that typically appears at the top of the screen. It can include the following components: Title : The screen or page title, usually in the center. Leading Widget : Often a navigation button like the back button or a drawer toggle. Actions : A list of actions that can be triggered, typically icons (like search or settings). Flexible Space : Allows for a custom background or a gradient. Bottom : Can include widgets like a TabBar for tabbed navigation. Typically, the AppBar widget is placed inside a Scaffold widget, which ...

In Flutter, creating rich, interactive user interfaces is easy thanks to its flexible and widget-centric architecture. One of the widgets that provide a simple way to display menus or options in a pop-up style is the PopupMenuButton . This widget allows you to show a list of choices in a context-sensitive menu when the user taps a button or area of the screen. This is often used for options, settings, or navigation menus in your app. What is a PopupMenuButton ? PopupMenuButton is a Flutter widget that creates a button which, when pressed, displays a menu of options (a "popup" menu) from which the user can select. The menu typically appears below or above the button, depending on the space available. This is ideal for use cases such as: Showing additional options like settings, actions, or context-sensitive menus. Providing a compact way to display multiple actions without cluttering the UI. Presenting a list of items that require user selection, such as deleting or sharing c...

The Drawer widget in Flutter is used for creating a slide-in menu typically displayed on the left side of the screen. It is most commonly used for app navigation, offering users quick access to different sections of the app. Properties of Drawer Widget 1. key ( Key? key ) Type : Key? Description : A unique identifier for the widget, used by Flutter's framework for efficient widget updates and tree management. Usage : Usually not required unless you're managing complex widget trees or need to maintain state efficiently. Drawer( key: Key('drawer-key'), ) 2. elevation ( double elevation ) Type : double Default : 16.0 Description : Controls the elevation of the drawer. This determines how much shadow is cast around the drawer and can be used to give the drawer a raised appearance. Usage : Lower values produce less shadow, while higher values give the drawer a more prominent shadow. Drawer( elevation: 8.0, // Controls shadow intensity child: ListView(), ) 3. child...

  In Flutter, an IconButton is a widget that combines an icon and a clickable button, which allows developers to create interactive icons that perform actions when tapped. The IconButton widget is widely used in mobile apps for toolbars, navigation bars, or anywhere you need an interactive icon. What is IconButton in Flutter? The IconButton widget is a material design button that is used to display an icon as a clickable button. It can trigger an action when tapped, similar to a button but with an icon instead of text. IconButton Constructor: The constructor of IconButton has the following signature: IconButton({ Key? key, required this.icon, this.iconSize = 24.0, this.color, this.padding = const EdgeInsets.all(8.0), this.onPressed, this.tooltip, }) Parameters of the IconButton Constructor: key : A unique identifier for the widget, used by Flutter’s framework to manage the widget tree. It’s typically used for performance optimization and not generally required f...

  The Switch widget in Flutter allows users to toggle between two states (usually "on" and "off"). It is part of the material design library and is widely used for enabling or disabling a setting in apps. In this blog, we will dive deep into the Switch widget by exploring its constructors , properties , use cases , and customization options . Switch Widget Overview The Switch widget is a stateful control that lets the user select one of two options: on (true) or off (false). This is typically used for toggling features like dark mode , notifications , or any binary state within a Flutter app. Switch Constructors The Switch widget provides a single constructor for use, but also comes with a variation when paired with other material components. Let's take a detailed look at the constructor: Switch Constructor: Switch({ Key? key, required bool value, required ValueChanged<bool> onChanged, Color? activeColor, Color? inactiveThumbColor, C...

In Flutter, layout and sizing are crucial for building beautiful and responsive UIs. One of the most commonly used widgets for controlling space and size is the SizedBox . Despite its simplicity, SizedBox is incredibly powerful and versatile. In this blog, we’ll explore the SizedBox widget in-depth, covering all its constructors , properties , use cases , and practical examples to help you master its usage. What is the SizedBox Widget? The SizedBox widget is a simple box that can have a fixed width and height, and optionally contain a child widget. It's typically used for: Adding space between widgets. Constraining the size of child widgets. Filling available space in layouts. The SizedBox can be used in several ways, depending on the layout requirements, making it an essential tool for Flutter developers. Constructors of SizedBox Flutter provides several constructors for the SizedBox widget, each serving different purposes. Let's explore them in detail: 1. Default Constr...

Flutter provides a rich set of widgets that help developers build beautiful and performant mobile applications. One of the most commonly used widgets for displaying a scrollable list of items is the ListView widget. Whether you're building a simple list of data or a complex dynamic list, the ListView widget in Flutter provides a flexible, efficient, and powerful solution. What is a ListView in Flutter? ListView is a scrolling widget that lets you display a list of widgets in a linear array. This widget can either be vertical or horizontal and can handle large sets of data efficiently by using a lazy loading mechanism, which only builds items that are visible on the screen (this is managed by the ListView.builder constructor). Why Use ListView? Scrollability : It's essential when displaying a large number of items that might not fit on the screen at once. Performance : It efficiently renders only the visible items, thus reducing memory usage when dealing with large lists. F...