bento_layout 0.1.0

A Flutter package for building bento-style grid layouts using the skyline bin-packing algorithm. Tiles of varying sizes are packed without overlap or unnecessary gaps. Width fills the parent; height i [...]

bento_layout

A Flutter package for building bento-style grid layouts using the skyline bin-packing algorithm. Tiles of varying sizes are packed without overlap or unnecessary gaps. Width fills the available space exactly; height is stable across all screen sizes.

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Features

• 9 named tile sizes — quarterBar, halfCard, fullTower etc. Names encode both dimensions so no docs needed
• No column count — tile widths are fractions of total width, adapting to any screen automatically
• Stable heights — a fixed unitHeight decouples height from width so tiles don't grow or shrink with screen size
• Composable — use BentoGrid for simple cases or BentoGridDelegate to embed the grid in your own CustomScrollView
• Extensible — implement BentoSizingStrategy to override tile dimensions without touching the algorithm

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Getting started

Add the package to your pubspec.yaml:

dependencies:
  bento_layout: ^0.1.0

---

Usage

Basic — BentoGrid

import 'package:bento_layout/bento_layout.dart';

BentoGrid(
  unitHeight: 180,
  items: [
    BentoItem(
      size: BentoItemSize.fullTower,
      child: MyHeroTile(),
    ),
    BentoItem(
      size: BentoItemSize.halfCard,
      child: MyLinkTile(),
    ),
    BentoItem(
      size: BentoItemSize.halfCard,
      child: MyLinkTile(),
    ),
    BentoItem(
      size: BentoItemSize.fullBar,
      child: MySectionTitle('Projects'),
    ),
    BentoItem(
      size: BentoItemSize.halfTower,
      child: MyProjectTile(),
    ),
    BentoItem(
      size: BentoItemSize.halfTower,
      child: MyProjectTile(),
    ),
  ],
)

Advanced — BentoGridDelegate

Use BentoGridDelegate directly when you need to compose the grid alongside other slivers in your own CustomScrollView — for example, a profile header that scrolls with the grid.

import 'package:bento_layout/bento_layout.dart';

final List<BentoItem> items = myTiles
    .map((t) => BentoItem(size: t.bentoSize, child: MyTile(config: t)))
    .toList();

CustomScrollView(
  slivers: [
    const SliverToBoxAdapter(child: MyProfileHeader()),
    const SliverToBoxAdapter(child: SizedBox(height: 20)),
    SliverPadding(
      padding: const EdgeInsets.symmetric(horizontal: 16),
      sliver: SliverGrid(
        gridDelegate: BentoGridDelegate(
          items: items,
          unitHeight: 180,
        ),
        delegate: SliverChildBuilderDelegate(
          (context, index) => items[index].child,
          childCount: items.length,
        ),
      ),
    ),
  ],
)

Note: Do not nest BentoGrid inside another CustomScrollView — it manages its own scroll view internally. Use BentoGridDelegate + SliverGrid instead.

Custom sizing strategy

class TabletSizingStrategy implements BentoSizingStrategy {
  const TabletSizingStrategy();

  @override
  BentoDimension getDimensions(BentoItemSize size) {
    return switch (size) {
      BentoItemSize.halfTower => const BentoDimension(widthFraction: 0.5, heightSpan: 1.5),
      BentoItemSize.fullTower => const BentoDimension(widthFraction: 1.0, heightSpan: 1.5),
      _ => const DefaultBentoSizingStrategy().getDimensions(size),
    };
  }
}

BentoGrid(
  items: items,
  strategy: const TabletSizingStrategy(),
)

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Tile sizes

BentoItemSize	Width	Height (unitHeight=180)
quarterBar	25%	90px
quarterCard	25%	180px
quarterTower	25%	360px
halfBar	50%	90px
halfCard	50%	180px
halfTower	50%	360px
fullBar	100%	90px
fullCard	100%	180px
fullTower	100%	360px

Width is always a fraction of the total available grid width. Height is always a multiple of unitHeight.

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BentoGrid parameters

Parameter	Type	Default	Description
items	List<BentoItem>	required	Tiles to display
unitHeight	double	180.0	Height of one row unit in pixels
strategy	BentoSizingStrategy?	null	Custom sizing strategy
padding	EdgeInsetsGeometry?	null	Padding around the grid
physics	ScrollPhysics?	null	Scroll physics
primary	bool?	null	Whether this is the primary scroll view
shrinkWrap	bool	false	Whether to shrink-wrap content

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Additional information

• See the example/ directory for a runnable demo
• The algorithm is documented in detail in the package source — see src/layout/skyline_packing.dart
• To report issues or contribute, visit the project repository

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