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Description:

story

Instagram stories like UI with rich animations and customizability.

Usage #
StoryPageView requires at least three arguments: itemBuilder, pageLength, and storyLength.
/// Minimum example to explain the usage.
return Scaffold(
body: StoryPageView(
itemBuilder: (context, pageIndex, storyIndex) {
return Center(
child: Text("Index of PageView: $pageIndex Index of story on each page: $storyIndex"),
);
},
storyLength: (pageIndex) {
return 3;
},
pageLength: 4,
);
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itemBuilder builds the content of each story and is called with the index of the pageView and
the index of the story on the page.

storyLength decides the length of story for each page. The example above always returns 3, but
it should depend on pageIndex.

pageLength is just the length of StoryPageView

The example above just shows 12 stories by 4 pages, which is not practical.
This one is the proper usage, extracted from example.
return Scaffold(
body: StoryPageView(
itemBuilder: (context, pageIndex, storyIndex) {
final user = sampleUsers[pageIndex];
final story = user.stories[storyIndex];
return Stack(
children: [
Positioned.fill(
child: Container(color: Colors.black),
),
Positioned.fill(
child: Image.network(
story.imageUrl,
fit: BoxFit.cover,
),
),
Padding(
padding: const EdgeInsets.only(top: 44, left: 8),
child: Row(
children: [
Container(
height: 32,
width: 32,
decoration: BoxDecoration(
image: DecorationImage(
image: NetworkImage(user.imageUrl),
fit: BoxFit.cover,
),
shape: BoxShape.circle,
),
),
const SizedBox(
width: 8,
),
Text(
user.userName,
style: TextStyle(
fontSize: 17,
color: Colors.white,
fontWeight: FontWeight.bold,
),
),
],
),
),
],
);
},
gestureItemBuilder: (context, pageIndex, storyIndex) {
return Align(
alignment: Alignment.topRight,
child: Padding(
padding: const EdgeInsets.only(top: 32),
child: IconButton(
padding: EdgeInsets.zero,
color: Colors.white,
icon: Icon(Icons.close),
onPressed: () {
Navigator.pop(context);
},
),
),
);
},
pageLength: sampleUsers.length,
storyLength: (int pageIndex) {
return sampleUsers[pageIndex].stories.length;
},
onPageLimitReached: () {
Navigator.pop(context);
},
),
);
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gestureItemBuilder builds widgets that need gesture actions

In this case, IconButton to close the page is in the callback.
You CANNOT place the gesture widgets in itemBuilder as they are covered and disabled by the
default story gestures.

onPageLimitReached is called when the very last story is finished.

It is recommended to use data model with two layers. In this case, UserModel which has the list
of StoryModel

/// Example Data Model
class UserModel {
UserModel(this.stories, this.userName, this.imageUrl);

final List<StoryModel> stories;
final String userName;
final String imageUrl;
}

class StoryModel {
StoryModel(this.imageUrl);

final String imageUrl;
}
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StoryImage #
If you show images in StoryPageView, use StoryImage. It can stop the indicator until the image
is fully loaded.
StoryImage(
/// key is required
key: ValueKey(story.imageUrl),
imageProvider: NetworkImage(
story.imageUrl,
),
fit: BoxFit.fitWidth,
)
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Be sure to assign the unique key value for each image, otherwise the image loading will not be
handled properly.
indicatorAnimationController #
If you stop/start the animation of the story with your custom widgets,
use indicatorAnimationController
class _StoryPageState extends State<StoryPage> {
late ValueNotifier<IndicatorAnimationCommand> indicatorAnimationController;

@override
void initState() {
super.initState();
indicatorAnimationController = ValueNotifier<IndicatorAnimationCommand>(
IndicatorAnimationCommand.resume);
}

@override
void dispose() {
indicatorAnimationController.dispose();
super.dispose();
}

@override
Widget build(BuildContext context) {
return Scaffold(
body: StoryPageView(
indicatorAnimationController: indicatorAnimationController,
...,
),
);
}
}
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Once the instance is passed to StoryPageView, you can stop handle the indicator by the methods
below.

/// To pause the indicator
indicatorAnimationController.value = IndicatorAnimationCommand.pause;

/// To resume the indicator
indicatorAnimationController.value = IndicatorAnimationCommand.resume;

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Contributors #

Santa Takahashi💻
Isaias Mejia de los Santos💻
Медик💻
Alperen Soysal💻
AtixD💻
harshitFinmapp💻
dmitry-kotorov💻