Скачать или смотреть How to know the parts of rebuilding in the flutter application

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In Flutter, when the UI needs to update, the framework employs a mechanism called the "build" process. This process determines which parts of the UI tree need to be recreated and redrawn on the screen. However, Flutter is optimized to avoid unnecessary rebuilding, which improves performance. Here's how to understand which parts rebuild in your Flutter application:

1. Widget Build Methods:

Each widget in your Flutter application has a build method that defines its UI.
When a widget needs to be rebuilt, its build method is called. This can happen due to various reasons, such as:
Changes in the widget's own state (using setState or a state management solution)
Changes in the state of its parent widgets that this widget depends on (through inheritance or other mechanisms)
Changes in external data sources that the widget uses (e.g., data fetched from an API)
2. Dirty Widgets:

Flutter maintains a concept of "dirty" widgets. A dirty widget is one that needs to be rebuilt because something has changed that affects its appearance.
The framework intelligently determines which widgets are dirty and only rebuilds those, minimizing unnecessary work.