What ’s the use of Navigation.push in Flutter?

In Flutter, Navigator.push is a crucial method for adding new routes (pages) to the application's navigation stack. Its primary purpose is to facilitate page navigation within the application, enabling transitions from the current page to a new page. Navigator.push is typically used in conjunction with MaterialPageRoute, which defines the content and animation effects for the new page.

Usage Example

Suppose you have a product list page, and when a user clicks on a product, you want to navigate to the product details page. In this scenario, you can use Navigator.push to achieve this.

dart
// Assume this is the click event handler for a product in the product list page
void _goToProductDetails(Product product) {
  Navigator.push(
    context,
    MaterialPageRoute(
      builder: (context) => ProductDetailsPage(product: product),
    ),
  );
}

Key Advantages

Using Navigator.push offers several benefits:

1. State preservation: When a new page is pushed onto the navigation stack, the state of the previous page is preserved, allowing users to return to the original page via the back button or gesture without losing previous state.
2. Animation support: MaterialPageRoute provides default platform-adaptive animations, making page transitions appear more natural and intuitive.
3. Simplified data passing: As demonstrated in the example, data can be easily passed when creating a new page, which is highly convenient for displaying details or proceeding to subsequent steps.

In summary, Navigator.push serves as the core mechanism in Flutter for handling navigation and page transitions, simplifying the development of multi-page applications while offering rich customization options to meet diverse requirements.