Flutter is Google’s Mobile SDK to build native iOS and Android, Desktop (Windows, Linux, macOS), and Web apps from a single codebase. When building applications with Flutter everything towards Widgets – the blocks with which the flutter apps are built. They are structural elements that ship with a bunch of material design-specific functionalities and new widgets can be composed out of existing ones too. The process of composing widgets together is called composition. The User Interface of the app is composed of many simple widgets, each of them handling one particular job. That is the reason why Flutter developers tend to think of their flutter app as a tree of widgets.

Crowd

This instructional exercise is ready for experts who are seeking to make a lifelong in the field of versatile applications. This instructional exercise is expected to make you agreeable in getting everything rolling with Ripple system and its different functionalities.

Essentials

This instructional exercise is composed expecting that the perusers are as of now mindful about what a System is and that the perusers have a sound information on Item Situated Programming and fundamental information on Android structure and Dart programming. On the off chance that you are a fledgling to any of these ideas, we recommend you to go through instructional exercises connected with these first, before you start with Vacillate.

Widgets

Each element on a screen of the Flutter app is a widget. The view of the screen completely depends upon the choice and sequence of the widgets used to build the apps. And the structure of the code of an apps is a tree of widgets. 

Category of Widgets

Accessibility:

These are the set of widgets that make a flutter app more easily accessible.

Animation and Motion:

These widgets add animation to other widgets.

Assets, Images, and Icons:

These widgets take charge of assets such as display images and show icons.

Async:

These provide async functionality in the flutter application.

Basics:

These are the bundle of widgets that are absolutely necessary for the development of any flutter application.

Cupertino: 

These are the iOS designed widgets.

Input: 

This set of widgets provides input functionality in a flutter application.

Interaction Models: 

These widgets are here to manage touch events and route users to different views in the application.

Layout: 

This bundle of widgets helps in placing the other widgets on the screen as needed.

Material Components: 

This is a set of widgets that mainly follow material design by Google.

Container class in Flutter:

Container class in flutter is a convenience widget that combines common painting, positioning, and sizing of widgets. A Container class can be used to store one or more widgets and position them on the screen according to our convenience. Basically, a container is like a box to store contents. A basic container element that stores a widget has a margin, which separates the present container from other contents. The total container can be given a border of different shapes, for example, rounded rectangles, etc. A container surrounds its child with padding and then applies additional constraints to the padded extent (incorporating the width and height as constraints, if either is non-null).

Scaffold class in Flutter:

Scaffold is a class in flutter which provides many widgets or we can say APIs like Drawer, Snack-Bar, Bottom-Navigation-Bar, Floating-Action-Button, App-Bar, etc. Scaffold will expand or occupy the whole device screen. It will occupy the available space. Scaffold will provide a framework to implement the basic material design layout of the application. 

Flutter – Carousel Slider:

Carousel Slider is one of the most popular image slider used nowadays in most apps. These Carousel Sliders are mostly seen in various eCommerce sites such as Amazon, Flipkart, Myntra, and many more. Displaying the images in a slider gives an attractive User Experience. As these sliders are automated you can get to see various types of images and content in them. 

Flutter –Staggered Grid View

Staggered Grid View is a type of layout that is used to display images and posts. As you see in various social platforms such as Pinterest and many more. The main feature of Staggered Grid View is that it makes the layout beautiful and develop a great User Experience. Staggered Grid View consists of containers present in Rows and columns of different sizes. Which displays images and posts of various sizes.

Features

• Set crossAxiscount & minAxiscount to the Grid view
• Main_axis extent of tiles may be fixed or multiple of cell’s length.
• Configurable main-axis and cross-axis margins between tiles.
• SliverStaggeredGrid for using in a CustomScrollView.
• Staggered and Spannable grid layouts.