PhotoViewGallery class

A StatefulWidget that shows multiple PhotoView widgets in a PageView

Some of PhotoView constructor options are passed direct to PhotoViewGallery constructor. Those options will affect the gallery in a whole.

Some of the options may be defined to each image individually, such as initialScale or PhotoViewHeroAttributes. Those must be passed via each PhotoViewGalleryPageOptions.

Example of usage as a list of options:

PhotoViewGallery(
  pageOptions: <PhotoViewGalleryPageOptions>[
    PhotoViewGalleryPageOptions(
      imageProvider: AssetImage("assets/gallery1.jpg"),
      heroAttributes: const PhotoViewHeroAttributes(tag: "tag1"),
    ),
    PhotoViewGalleryPageOptions(
      imageProvider: AssetImage("assets/gallery2.jpg"),
      heroAttributes: const PhotoViewHeroAttributes(tag: "tag2"),
      maxScale: PhotoViewComputedScale.contained * 0.3
    ),
    PhotoViewGalleryPageOptions(
      imageProvider: AssetImage("assets/gallery3.jpg"),
      minScale: PhotoViewComputedScale.contained * 0.8,
      maxScale: PhotoViewComputedScale.covered * 1.1,
      heroAttributes: const HeroAttributes(tag: "tag3"),
    ),
  ],
  loadingBuilder: (context, progress) => Center(
           child: Container(
             width: 20.0,
             height: 20.0,
             child: CircularProgressIndicator(
               value: _progress == null
                   ? null
                   : _progress.cumulativeBytesLoaded /
                       _progress.expectedTotalBytes,
             ),
           ),
         ),
  backgroundDecoration: widget.backgroundDecoration,
  pageController: widget.pageController,
  onPageChanged: onPageChanged,
)

Example of usage with builder pattern:

PhotoViewGallery.builder(
  scrollPhysics: const BouncingScrollPhysics(),
  builder: (BuildContext context, int index) {
    return PhotoViewGalleryPageOptions(
      imageProvider: AssetImage(widget.galleryItems[index].image),
      initialScale: PhotoViewComputedScale.contained * 0.8,
      minScale: PhotoViewComputedScale.contained * 0.8,
      maxScale: PhotoViewComputedScale.covered * 1.1,
      heroAttributes: HeroAttributes(tag: galleryItems[index].id),
    );
  },
  itemCount: galleryItems.length,
  loadingBuilder: (context, progress) => Center(
           child: Container(
             width: 20.0,
             height: 20.0,
             child: CircularProgressIndicator(
               value: _progress == null
                   ? null
                   : _progress.cumulativeBytesLoaded /
                       _progress.expectedTotalBytes,
             ),
           ),
         ),
  backgroundDecoration: widget.backgroundDecoration,
  pageController: widget.pageController,
  onPageChanged: onPageChanged,
)
Inheritance

Constructors

PhotoViewGallery({Key? key, required List<PhotoViewGalleryPageOptions>? pageOptions, LoadingBuilder? loadingBuilder, BoxDecoration? backgroundDecoration, bool wantKeepAlive = false, bool gaplessPlayback = false, bool reverse = false, PageController? pageController, PhotoViewGalleryPageChangedCallback? onPageChanged, ValueChanged<PhotoViewScaleState>? scaleStateChangedCallback, bool enableRotation = false, ScrollPhysics? scrollPhysics, Axis scrollDirection = Axis.horizontal, Size? customSize, bool allowImplicitScrolling = false, bool pageSnapping = true})
Construct a gallery with static items through a list of PhotoViewGalleryPageOptions.
const
PhotoViewGallery.builder({Key? key, required int? itemCount, required PhotoViewGalleryBuilder? builder, LoadingBuilder? loadingBuilder, BoxDecoration? backgroundDecoration, bool wantKeepAlive = false, bool gaplessPlayback = false, bool reverse = false, PageController? pageController, PhotoViewGalleryPageChangedCallback? onPageChanged, ValueChanged<PhotoViewScaleState>? scaleStateChangedCallback, bool enableRotation = false, ScrollPhysics? scrollPhysics, Axis scrollDirection = Axis.horizontal, Size? customSize, bool allowImplicitScrolling = false, bool pageSnapping = true})
Construct a gallery with dynamic items.
const

Properties

allowImplicitScrolling → bool
When user attempts to move it to the next element, focus will traverse to the next page in the page view.
final
backgroundDecoration → BoxDecoration?
Mirror to PhotoView.backgroundDecoration
final
builder → PhotoViewGalleryBuilder?
Called to build items for the gallery when using PhotoViewGallery.builder
final
customSize → Size?
Mirror to PhotoView.customSize
final
enableRotation → bool
Mirror to PhotoView.enableRotation
final
gaplessPlayback → bool
Mirror to PhotoView.gaplessPlayback
final
hashCode → int
The hash code for this object.
no setterinherited
itemCount → int?
The count of items in the gallery, only used when constructed via PhotoViewGallery.builder
final
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
loadingBuilder → LoadingBuilder?
Mirror to PhotoView.loadingBuilder
final
onPageChanged → PhotoViewGalleryPageChangedCallback?
An callback to be called on a page change
final
pageController → PageController?
An object that controls the PageView inside PhotoViewGallery
final
pageOptions → List<PhotoViewGalleryPageOptions>?
A list of options to describe the items in the gallery
final
pageSnapping → bool
final
reverse → bool
Mirror to PageView.reverse
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
scaleStateChangedCallback → ValueChanged<PhotoViewScaleState>?
Mirror to PhotoView.scaleStateChangedCallback
final
scrollDirection → Axis
The axis along which the PageView scrolls. Mirror to PageView.scrollDirection
final
scrollPhysics → ScrollPhysics?
ScrollPhysics for the internal PageView
final
wantKeepAlive → bool
Mirror to PhotoView.wantKeepAlive
final

Methods

createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<StatefulWidget>
Creates the mutable state for this widget at a given location in the tree.
override
debugDescribeChildren() → List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
inherited
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String
A string representation of this object.
inherited
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String
Returns a string representation of this node and its descendants.
inherited
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String
Returns a one-line detailed description of the object.
inherited
toStringShort() → String
A short, textual description of this widget.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited