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Scaffold meaning in flutter7/14/2023 ![]() Container widget used for decorating its child widget. The container is a basic/common widget in Flutter which will contain other widgets. If we don't give Scaffold as a parent widget there will be no material look and feel in Material App. Ideally, in MaterialApp every page/Screen will consist of the parent widget as a scaffold. The scaffold will give Material look and feel in Screen. The scaffold is the MaterialApp Widget which gives us pre-defined properties like AppBar, Body, Bottom Navigation, Floating Action & Persistent Footer. The following diagram specifies the layers in Flutter app development.I would recommend you should understand MaterialApp Widget for a better understanding of Material Widgets like Scaffold and Container. Then, the layers go down to Gestures, foundation library, engine, and finally, core platform-specific code. The next layer is the rendering layer, which renders everything in the Flutter app. The second topmost layer contains all the Flutter native widgets. The topmost layer is the UI of the application, which is specific to the Android and iOS platforms. Layers are an important concept of the Flutter framework, which are grouped into multiple categories in terms of complexity and arranged in the top-down approach. The re-rendering is optimized by calculating the distance between old and new widget UI and render only necessary things that are changes. It is always auto re-rendered whenever its internal state is changed. State Managementįlutter widget maintains its state by using a special widget, StatefulWidget. We can also use other interactive features into the existing widgets by composing with the GestureDetector widget. ![]() GestureDector is an invisible widget, which includes tapping, dragging, and scaling interaction of its child widget. ![]() It is a widget that provides interaction (how to listen for and respond to) in Flutter using GestureDetector. These are Material Design for Android application and Cupertino Style for IOS application. The Flutter framework has two sets of widgets that conform to specific design languages. Thus, the Flutter application is itself a widget. In the above example, we can see that all the components are widgets that contain child widgets. Here, we are going to explain the example with the following diagram. We can understand it from the hello world example created in the previous section. This feature helps you to create a complex user interface very easily. It means the app is the top-level widget, and its UI is build using one or more children widgets, which again includes sub child widgets. In Flutter, the application is itself a widget that contains many sub widgets. The widgets are similar to the React components. It represents an immutable description of part of the user interface and includes graphics, text, shapes, and animations that are created using widgets. Widget in the Flutter is basically a user interface component that affects and controls the view and interface of the app. In Flutter, everything is a widget, which is the core concept of this framework. These libraries are written in Dart language. It contains all the required packages for the basic building blocks of writing a Flutter application. It takes Google's open-source graphics library, Skia, to render low-level graphics. It implements Flutter core libraries that include animation and graphics, file and network I/O, plugin architecture, accessibility support, and a dart runtime for developing, compiling, and running Flutter applications. It is a portable runtime for high-quality mobile apps and primarily based on the C++ language. The Flutter architecture mainly comprises of four components. In this section, we are going to discuss the architecture of the Flutter framework.
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