A simple zoomable image widget for Flutter

Flutter Photo View

A simple zoomable image widget for Flutter

Resolves a image provider and shows the result with useful gestures support, such as pinch to zoom and pan.

It also can show any widget instead of an image, such as Container, Text or a SVG. Just use custom child constructor.

Installation

Add photo_view as a dependency in your pubspec.yaml file

Import Photo View:

import 'package:photo_view/photo_view.dart';

Docs & API

For more information about how to use Photo View, check the API Docs

If you want to see it in practice, check the example app that explores most of Photo View’s use cases or download the latest version apk on the releases page

Usage

Given a ImageProvider imageProvider

@override
Widget build(BuildContext context) {
  return Container(
    child: PhotoView(
      imageProvider: AssetImage("assets/large-image.jpg"),
    )
  );
}

Result:

In action

Inline Usage

PhotoView can be used inside a container with size different than the screen.

The previous class PhotoViewInline has been removed, use PhotoView instead

@override
Widget build(BuildContext context) {
  return Container(
    margin: const EdgeInsets.symmetric(vertical: 20.0),
    height: 300.0,
    child: PhotoView(
      imageProvider: AssetImage("assets/large-image.jpg"),
    )
  );
}

Result:

In action

Note: If you don’t want to the zoomed image do not overlaps the size of the container, use ClipRect

Gallery

To show several images and let user change between them, use PhotoViewGallery.

import 'package:photo_view/photo_view.dart';
import 'package:photo_view/photo_view_gallery.dart';
// ...

@override
Widget build(BuildContext context) {
  return Container(
    child: PhotoViewGallery(
      pageOptions: <PhotoViewGalleryPageOptions>[
        PhotoViewGalleryPageOptions(
          imageProvider: AssetImage("assets/gallery1.jpeg"),
          heroTag: "tag1",
        ),
        PhotoViewGalleryPageOptions(
          imageProvider: AssetImage("assets/gallery2.jpeg"),
          heroTag: "tag2",
          maxScale: PhotoViewComputedScale.contained * 0.3
        ),
        PhotoViewGalleryPageOptions(
          imageProvider: AssetImage("assets/gallery3.jpeg"),
          initialScale: PhotoViewComputedScale.contained * 0.98,
          heroTag: "tag3",
        ),
      ],
      backgroundDecoration: BoxDecoration(color: Colors.black87),
    )
  );
}

Result (with a simple HUD):

In action

More screenshots

Small image Animated GIF Limited scale Hero animation
In action In action In action In action

Credit (github url) : https://github.com/renancaraujo/photo_view

Next Article : https://flutterappdev.com/2019/02/01/a-flutter-plugin-for-google-maps-mobile-app-development/

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