The FadeInImage widget in Flutter is used to display images with a fading effect when loading. It's commonly used to improve the user experience by providing a smooth transition as images load from the network.

Attributes:

1. placeholder (Widget):

   • The widget to be displayed while the image is loading. This can be a placeholder image or any other widget.

2. image (ImageProvider):

   • The image to be displayed once it's loaded. It can be an AssetImage, NetworkImage, or any other ImageProvider.

3. fit (BoxFit):

   • How the image should be inscribed into the space allocated for the FadeInImage. The default value is BoxFit.contain.

4. alignment (AlignmentGeometry):

   • The alignment of the image within its parent widget. The default value is Alignment.center.

5. placeholderErrorBuilder (Widget Function(BuildContext, Object)):

   • An optional builder function that creates a widget to be displayed if an error occurs while loading the image.

6. imageErrorBuilder (Widget Function(BuildContext, Object)):

   • An optional builder function that creates a widget to be displayed if an error occurs while loading the image.

7. fadeDuration (Duration):

   • The duration of the fading effect when transitioning from the placeholder to the image. The default value is 300 milliseconds.

Example:

import 'package:flutter/material.dart';

class FadeInImageExample extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('FadeInImage Widget Example'),
      ),
      body: Center(
        child: FadeInImage(
          placeholder: AssetImage('assets/placeholder.png'),
          image: NetworkImage('https://via.placeholder.com/300'),
          fit: BoxFit.cover,
          width: 300,
          height: 300,
        ),
      ),
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: FadeInImageExample(),
  ));
}

Explanation:

• In this example, a FadeInImage widget is used to display an image with a fading effect when loading.

• The placeholder attribute is set to an AssetImage for a placeholder image while the network image is loading.

• The image attribute is set to a NetworkImage to load the image from the network.

• The fit attribute is set to BoxFit.cover to make sure the image covers the entire space allocated for the FadeInImage.

• The width and height attributes are set to 300 pixels each to specify the dimensions of the FadeInImage.

• When you run this code, you'll see the placeholder image fading out smoothly as the network image loads in its place.