Questions and Answers
What is the primary purpose of a Scaffold widget in Flutter?
To define the basic material layout structure
What type of widget can change its appearance in response to user interactions or when it receives data?
Stateful widget
What is the purpose of the Composition process in Flutter?
To arrange widgets in a tree structure
What is the main difference between a RaisedButton and a regular Button in Flutter?
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What is the purpose of the TextStyle widget in Flutter?
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What is the role of the Widget Tree in Flutter?
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What type of widget is used to create a form in Flutter?
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What is the purpose of the Center widget in Flutter?
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What is the role of the MyApp object in Flutter?
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What is the main difference between a visible and an invisible widget in Flutter?
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Study Notes
Flutter Basics
- Flutter is a cross-platform mobile app development framework.
- It uses widgets to build user interfaces.
Material and Cupertino
- Google's Material Design is a system for building digital products with a consistent set of principles and components.
- Most Flutter widgets support Material Design.
- Apple has its own user interface design based on Cupertino.
Building Widgets
- Flutter renders widgets on the screen based on configuration information such as color, border, and content.
AppBar Widget
- The AppBar widget is a topmost bar in a Scaffold that displays the title of the app.
- It can also contain other widgets such as menus or actions.
FloatingActionButton Widget
- The FloatingActionButton widget is a circular button that floats over the content of the screen.
- It is usually placed at the bottom right corner of the screen.
- It remains fixed even when the content is scrolled.
Drawer Widget
- The Drawer widget is a slider menu or panel that is displayed at the side of the Scaffold.
- It is accessed by swiping left to right or right to left.
- The Scaffold sets an icon for the drawer and handles the gesture to open it.
Widgets
- Any user interface in Flutter is composed of widgets.
- Widgets are added in a tree structure called a Widget Tree.
- Widgets can be either stateful or stateless.
Stateful and Stateless Widgets
- Stateful widgets can change appearance in response to user interactions or receiving data.
- Examples of stateful widgets include Checkbox, Radio, Slider, Form, and TextField.
- Stateless widgets cannot change and include Icon and IconButton.
Common Widgets
- Layout widgets: Scaffold, Column, Row, Stack.
- Structure widgets: Button, Text, Image, RaisedButton.
- Style widgets: TextStyle, Color.
- Animation widgets: FadeInPhoto, transformations.
- Positioning and alignment widgets: Center, Padding.
Visible and Invisible Widgets
- Visible widgets include Output & Input widgets like RaisedButton and Text.
- Invisible widgets include Layout & Control widgets like Row and Column.
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