zhoulujue / photo_view

A simple zoomable image widget for Flutter

Flutter Photo View

A simple zoomable image widget for Flutter

PhotoView is useful in full screen exibition cases.

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

Installation

Add photo_view as a dependency in your pubspec.yaml file (what?).

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.

Full screen usage

Given a ImageProvider imageProvider (such as AssetImage or NetworkImage):

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

Result:

Inline Usage

If you want PhotoView to scale the image in container with size different than the screen, use PhotoViewInline instead.

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

Result:

Gallery

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

@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"),
          minScale: PhotoViewComputedScale.contained * 0.8,
          maxScale: PhotoViewComputedScale.covered * 1.1,
          heroTag: "tag3",
        ),
      ],
      backgroundColor: Colors.black87,
    );
  );
}

Result (with a simple HUD):

More screenshots

Small image	Animated GIF	Limited scale	Hero animation

Todo:

• Scale on doubleTap
• Zoom when pinched
• Respect screen and image boundaries
• Center image when zooming out
• Add image zoom limits (minScale an maxScale)
• Add GIF support
• Multiple image support (Gallery mode)
• Rotate gesture rotates image (Work in progress)

Pull requests are welcome 😊.