Pullable

Pengantar

Widget Pullable menambahkan fungsionalitas tarik-untuk-refresh dan muat-lebih-banyak ke konten scrollable apa pun. Widget ini membungkus child widget Anda dengan perilaku refresh dan paginasi berbasis gesture, mendukung beberapa gaya animasi header.

Dibangun di atas paket pull_to_refresh_flutter3, Pullable menyediakan API yang bersih dengan konstruktor bernama untuk konfigurasi umum.

Pullable(
  onRefresh: () async {
    // Fetch fresh data
    await fetchData();
  },
  child: ListView(
    children: items.map((item) => ListTile(title: Text(item))).toList(),
  ),
)

Penggunaan Dasar

Bungkus widget scrollable apa pun dengan Pullable:

Pullable(
  onRefresh: () async {
    await loadLatestPosts();
  },
  child: ListView.builder(
    itemCount: posts.length,
    itemBuilder: (context, index) => PostCard(post: posts[index]),
  ),
)

Ketika pengguna menarik ke bawah pada daftar, callback onRefresh akan dipanggil. Indikator refresh secara otomatis selesai ketika callback selesai.

Konstruktor

Pullable menyediakan konstruktor bernama untuk konfigurasi umum:

Contoh

// Classic header
Pullable.classicHeader(
  onRefresh: () async => await refreshData(),
  child: myListView,
)

// Material header
Pullable.materialClassicHeader(
  onRefresh: () async => await refreshData(),
  child: myListView,
)

// No bounce effect
Pullable.noBounce(
  onRefresh: () async => await refreshData(),
  headerType: PullableHeaderType.classic,
  child: myListView,
)

// Custom header widget
Pullable.custom(
  customHeader: MyCustomRefreshHeader(),
  onRefresh: () async => await refreshData(),
  child: myListView,
)

PullableConfig

Untuk kontrol yang lebih detail, gunakan PullableConfig dengan konstruktor Pullable.builder():

Pullable.builder(
  config: PullableConfig(
    enablePullDown: true,
    enablePullUp: true,
    headerType: PullableHeaderType.materialClassic,
    onRefresh: () async => await refreshData(),
    onLoading: () async => await loadMoreData(),
    refreshCompleteDelay: Duration(milliseconds: 500),
    loadCompleteDelay: Duration(milliseconds: 300),
    physics: BouncingScrollPhysics(),
  ),
  child: myListView,
)

Semua Opsi Konfigurasi

Gaya Header

Pilih dari lima animasi header bawaan:

enum PullableHeaderType {
  classic,           // Classic pull indicator
  waterDrop,         // Water drop animation (default)
  materialClassic,   // Material Design classic
  waterDropMaterial,  // Material water drop
  bezier,            // Bezier curve animation
}

Atur gaya melalui konstruktor atau config:

// Via named constructor
Pullable.bezierHeader(
  onRefresh: () async => await refreshData(),
  child: myListView,
)

// Via config
Pullable.builder(
  config: PullableConfig(
    headerType: PullableHeaderType.bezier,
    onRefresh: () async => await refreshData(),
  ),
  child: myListView,
)

Tarik Atas untuk Muat Lebih Banyak

Aktifkan paginasi dengan pemuatan tarik-atas:

Pullable.builder(
  config: PullableConfig(
    enablePullDown: true,
    enablePullUp: true,
    onRefresh: () async {
      // Reset to page 1
      page = 1;
      items = await fetchItems(page: page);
      setState(() {});
    },
    onLoading: () async {
      // Load next page
      page++;
      List<Item> more = await fetchItems(page: page);
      items.addAll(more);
      setState(() {});
    },
  ),
  child: ListView.builder(
    itemCount: items.length,
    itemBuilder: (context, index) => ItemTile(item: items[index]),
  ),
)

Header dan Footer Kustom

Sediakan widget header dan footer Anda sendiri:

Pullable.custom(
  customHeader: Container(
    height: 60,
    alignment: Alignment.center,
    child: CircularProgressIndicator(),
  ),
  customFooter: Container(
    height: 40,
    alignment: Alignment.center,
    child: Text("Loading more..."),
  ),
  enablePullUp: true,
  onRefresh: () async => await refreshData(),
  onLoading: () async => await loadMore(),
  child: myListView,
)

Controller

Gunakan RefreshController untuk kontrol programatik:

final RefreshController _controller = RefreshController();

Pullable(
  controller: _controller,
  onRefresh: () async => await refreshData(),
  child: myListView,
)

// Trigger refresh programmatically
_controller.triggerRefresh();

// Trigger loading programmatically
_controller.triggerLoading();

// Check state
bool refreshing = _controller.isRefreshing;
bool loading = _controller.isLoading;

Metode Extension pada RefreshController

Metode Extension

Widget apa pun dapat dibungkus dengan tarik-untuk-refresh menggunakan extension .pullable():

ListView(
  children: items.map((item) => ListTile(title: Text(item.name))).toList(),
).pullable(
  onRefresh: () async {
    await fetchItems();
  },
)

Dengan config kustom:

myListView.pullable(
  onRefresh: () async => await refreshData(),
  pullableConfig: PullableConfig(
    headerType: PullableHeaderType.classic,
    enablePullUp: true,
    onLoading: () async => await loadMore(),
  ),
)

Integrasi CollectionView

CollectionView menyediakan varian pullable dengan paginasi bawaan:

CollectionView.pullable

CollectionView<User>.pullable(
  data: (iteration) async => api.getUsers(page: iteration),
  builder: (context, item) => UserTile(user: item.data),
  onRefresh: () => print('Refreshed!'),
  headerStyle: 'WaterDropHeader',
)

CollectionView.pullableSeparated

CollectionView<User>.pullableSeparated(
  data: (iteration) async => api.getUsers(page: iteration),
  builder: (context, item) => UserTile(user: item.data),
  separatorBuilder: (context, index) => Divider(),
)

CollectionView.pullableGrid

CollectionView<Product>.pullableGrid(
  data: (iteration) async => api.getProducts(page: iteration),
  builder: (context, item) => ProductCard(product: item.data),
  crossAxisCount: 2,
  mainAxisSpacing: 8,
  crossAxisSpacing: 8,
)

Parameter Khusus Pullable

Contoh

Daftar Berpaginasi dengan Refresh

class _PostListState extends NyState<PostListPage> {
  List<Post> posts = [];
  int page = 1;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Pullable.builder(
        config: PullableConfig(
          enablePullDown: true,
          enablePullUp: true,
          headerType: PullableHeaderType.materialClassic,
          onRefresh: () async {
            page = 1;
            posts = await api<PostApiService>((request) => request.getPosts(page: page));
            setState(() {});
          },
          onLoading: () async {
            page++;
            List<Post> more = await api<PostApiService>((request) => request.getPosts(page: page));
            posts.addAll(more);
            setState(() {});
          },
        ),
        child: ListView.builder(
          itemCount: posts.length,
          itemBuilder: (context, index) => PostCard(post: posts[index]),
        ),
      ),
    );
  }
}

Refresh Sederhana dengan Extension

ListView(
  children: notifications
    .map((n) => ListTile(
      title: Text(n.title),
      subtitle: Text(n.body),
    ))
    .toList(),
).pullable(
  onRefresh: () async {
    notifications = await fetchNotifications();
    setState(() {});
  },
)