Parallax Animation — Flutter

Adding art with Flutter is one of the amazing options for mobile development. Creating an astounding user interface on the web, mobile platforms, and desktop platforms is easier with Flutter. These provide a greater environment for building feature-rich mobile app experiences.

Building the tab navigator using the parallax background or animation in Flutter app development gives a perfect look. Scrolling down the apps lets us notice the images appear slowly compared to the rest of the screen.

What is ParallaxArea and ParallaxWidget?

Normally, there are different plugins used for the distant background using Flutter. These effects are called Parallax. It is the plugin which allows you to easily enable the better parallax effect in a Scrollable manner.

You can easily wrap the Scalable feature using the ParallaxArea along with ParallaxWidget. The Flutter SDK helps to easily make the installation quite effective. These are available in all operating systems, even without any hassle.

Project definition file called pubspec.yaml involved with the event_bus dependency is added. Event Bus is suitable for allowing listeners to easily subscribe to events as well as for the publishers to start the events.

The background image can be included along with image assets under the assets sessions. It would allow image files to be referred to with displaying within applications. Creating the parallax effect by building the list of cards is quite an efficient option.

How to Create A List To Hold The Parallax Items?

Normally, there are various strategies involved with creating the list to hold Parallax animations. These are carried using the Flutter even without any hassle.

Below are the techniques to easily display the list of parallax scrolling images, and these are displayed by creating the new stateless widget called the ParallaxRecipe.

ParallaxRecipe is a suitable option for building the widget tree along the SingleChildScrollView along with the column. These form the appropriate list:

	
class ParallaxRecipe extends StatelessWidget {
  const ParallaxRecipe({super.key});
@override
  Widget build(BuildContext context) {
    return SingleChildScrollView(
child: Column(
        children: const [],
      ),
    );
  }
}

What Are The Features Of Parallax Animation?

Parallax animation in Flutter involves various lists of items displaying rounded-rectangle background images. It automatically exemplifies 1 of 7 locations in the world. It will be stacked at the top in the background image across various locations and countries.

These are positioned in the lower left aspects. It is set between background images along text in the dark gradient. The process improves the legibility of text against the background.

Parallax animation in Flutter is enabled with amazing features, such as:

  • Customizable magnitude of the Parallax
  • Parallax vertically
  • Inverted parallax
  • Overlap foreground
  • Background parallax
  • Works with any Scrollable
  • Horizontally foreground

Normally, the Parallax animation is a plugin which relies on the Scrollable notification along RenderBox calculation. It would be suitable for moving the content accordingly.

You can wrap the Scrollable features with ParallaxArea by using the ParallaxWidget inside scrollable. It automatically adds more effect to the background to the extent.

Also Read: Top 10 Flutter app development tools

How to display items with text?

The Parallax animation effect in the Flutter is a suitable option for displaying the items with the text. These could be static images which are a suitable option for giving a beautiful look.

Implementing the stateless widget known as the LocationListItem is quite common. These have the amazing visuals mentioned without any hassle. It is convenient to use a static Image widget in the background, and it can be replaced with a Flutter widget using a parallax version.

	
@immutable
class LocationListItem extends StatelessWidget {
  const LocationListItem({
    super.key,
    required this.imageUrl,
    required this.name,
    required this.country,
  });
 
  final String imageUrl;
  final String name;
  final String country;
 
  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 16),
      child: AspectRatio(
        aspectRatio: 16 / 9,
        child: ClipRRect(
          borderRadius: BorderRadius.circular(16),
          child: Stack(
            children: [
              _buildParallaxBackground(context),
              _buildGradient(),
              _buildTitleAndSubtitle(),
            ],
          ),
        ),
      ),
    );
  }
 
  Widget _buildParallaxBackground(BuildContext context) {
    return Image.network(
      imageUrl,
      fit: BoxFit.cover,
    );
  }
 
  Widget _buildGradient() {
    return Positioned.fill(
      child: DecoratedBox(
        decoration: BoxDecoration(
          gradient: LinearGradient(
            colors: [Colors.transparent, Colors.black.withOpacity(0.7)],
            begin: Alignment.topCenter,
            end: Alignment.bottomCenter,
            stops: const [0.6, 0.95],
          ),
        ),
      ),
    );
  }
 
  Widget _buildTitleAndSubtitle() {
    return Positioned(
      left: 20,
      bottom: 20,
      child: Column(
        mainAxisSize: MainAxisSize.min,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            name,
            style: const TextStyle(
              color: Colors.white,
              fontSize: 20,
              fontWeight: FontWeight.bold,
            ),
          ),
          Text(
            country,
            style: const TextStyle(
              color: Colors.white,
              fontSize: 14,
            ),
          ),
        ],
      ),
    );
  }
}

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Which is the best way to implement the Parallax Effect?

Feature-rich parallax scrolling effect can be achieved by pushing the background image across the opposite direction. These also involve items sliding on screen so each background image could slide downward.

Apart from these, the list of items sliding down the screen could be added along with each background image upwards slightly. So the visual will be in the Parallax. The parallax effect will vary with the list of items across the current position in the ancestor Scrollable.

Position of the background image of the item would change with the scroll position. It is quite a common attribute that gives an effective solution for changing the background.

Normally, this position involves a list of items that are scrollable that are not available in Flutter’s layout phase. The position of the background image can be determined with the painting phase, so this comes with the layout phase.

Flutter app development practices gives the widget called Flow. It is specially designed to provide complete control of transforming child widgets even before the widget is painted. It is convenient to intercept the painting phase as well as take control of repositioning the child widget.

Background images can be easily sized appropriately. You can easily calculate the vertical position for each background image. These are based on adding more scroll positions which give you painting features.

Apart from these, it involves 3 critical pieces of information for computing desired positions in the background image.

  • Size of the image to fit in the list item
  • Bounds of ancestor Scrollable
  • Bounds of the individual list item

ScrollableState needs to be passed along with FlowDelegate for look-bounds on Scrollable. You can conveniently pass the list of items BuildContext along FlowDelegate for adding the final size of the background image.

Final size of the background image is assigned with GlobalKey for the Image widget. It can be added by passing GlobalKey into FlowDelegate. The widget is placed in the background, so they contain the OverflowBox. It is also sized based on overflowWidthFactor as well as overflowHeightFactor.

Double overflowWidthFactor

Normally, the double overflowWidthFactor involves a width multiplier factor quite larger with child multiplied. These will be based on overflowWidthFactor, and it increases value for increasing parallax effect. It is added with the horizontal scroll to provide suitable attributes.

Min value 1, default value 2.

Double overflowHeightFactor

It is a height multiplier factor with background taller than a child multiplied based on overflowHeightFactor. These increase value with increasing parallax effect with vertical scroll.

Min value 1, default value 2.

Conclusion

Flutter gives a powerful set of features giving more advantages to the Dart language. It helps create modern native applications and add incredible animations. The parallax scrolling effect could be easily achieved by pushing the background image along opposite directions. These transitions also render excellent performance seamlessly. Above codes are suitable for a basic understanding of creating the Parallax animation in Flutter.

If you wish to develop a Flutter application for your business, you can contact the best mobile app development company, like Bosc Tech labs, who will assist with your project and give you the best app that can stand out in the market.

Feel Free to get in touch with our Flutter Experts!

Frequently Asked Questions (FAQs)

1. What is the parallax section?

The parallax effect is the modern web design technique where a background element scrolls slower than the foreground effect. This effect is used on the landing pages, sales pages, long-form content, or the homepage of a business website. Hence, it will highlight various sections on the lengthy page.

2. What is the parallax scrolling effect?

Parallax scrolling is the website trend where the background content is moved at a various speed than the foreground content while scrolling.

3. How do you create a parallax effect in Flutter development?

A parallax scrolling effect is gained by slightly pushing the background image in the opposite direction of the remainder of the list. These list items will slide up the screen, and each background image will slide slightly downward. Hence, the list of items slides down the screen, and each background image slides slightly upward.


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