should_rebuild

Package Overview

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The should_rebuild package enhances Flutter performance by allowing widgets to control when their children should rebuild. It provides a way to define custom conditions for rebuilding, preventing unnecessary widget tree updates. This is particularly useful in complex UIs where frequent rebuilds can impact performance. By wrapping child widgets with a condition-based rebuild guard, developers can optimize rendering and reduce computational overhead. The package supports all major platforms and integrates seamlessly into existing Flutter projects.

Use cases

Optimizing complex UIs with frequent rebuilds
Reducing unnecessary widget updates in lists
Improving performance in stateful widgets
Customizing rebuild logic based on specific conditions
Minimizing render cost in large widget trees

Key features

Customizable rebuild conditions
Prevents unnecessary child rebuilds
Simple integration with existing widgets
Cross-platform support
Lightweight and efficient

Suitable for

Developers optimizing app performance
Teams managing large Flutter codebases
Apps with dynamic or frequently updated UIs
Builders seeking fine-grained control over widget updates
Projects requiring minimal boilerplate for rebuild logic

Considerations

Requires careful condition logic to avoid missed updates
May add complexity if overused
Not needed for simple or static widgets
Best used in performance-critical sections
Needs understanding of Flutter's build lifecycle

Original README

Original README snapshot from the linked source repository. Visit the repository for the latest content.

ShouldRebuild

A widget can prevent Child Widget unnecessary rebuilds.You can filter whether you need rebuild based on whether the property values received by the old Child Widget and the new Child Widget are equal.

(这个widget可以防止它的child发生不必要的rebuilds，你可以判断新的Child Widget和旧的Child Widget接收的属性值是否相等来过滤是否需要rebuild)

Add dependency

dependencies:
  should_rebuild: 1.0.1

dependencies:
  should_rebuild:
      git:
        url: https://github.com/fluttercandies/should_rebuild

Super simple to use

ShouldRebuild<Todo>(
    shouldRebuild: (oldWidget, newWidget) => oldWidget.counter != newWidget.counter,
    child: Todo(counter: counter,)
),

Todo Widget

class Todo extends StatelessWidget {
  final int counter;
  Todo({this.counter});
  @override
  Widget build(BuildContext context) {
    return Container(
      child: Text(counter.toString()),
    );
  }
}

The Todo widget only rebuilds if counter changes

ShouldRebuild Widget is a generic StatefulWidget,this generic represents the type of Widget returned by the builder method

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