Apa iku widgets ing Flutter?

Question

Accepted Answer

Ing Flutter, **kabeh iku widget** — elemen UI (tombol, teks, gambar), struktur tata letak (baris, kolom, padding), lan malah aplikasi dhéwé kabeh iku widget. Widget minangka blok bangunan sing durung bisa diganti (immutable) sing nyusun dadi antarmuka pangguna lengkap.

## Kabeh iku widget

```text
Widgets describe the UI. EVERYTHING is a widget:
  → visible elements: Text, Image, Icon, Button, etc.
  → layout: Row, Column, Container, Padding, Center, Stack, etc.
  → structure: Scaffold (page structure), AppBar, etc.
  → even the app itself (MaterialApp) and abstract things (Padding, Theme)
→ You build UI by COMPOSING widgets into a tree (widgets contain other widgets).
```

## Nyusun widget dadi struktur pohon

```dart
// build a UI by NESTING widgets (composition)
Scaffold(                       // page structure
  appBar: AppBar(title: Text('Home')),   // app bar with text
  body: Center(                 // centers its child
    child: Column(              // vertical layout
      children: [
        Text('Hello'),          // text widget
        ElevatedButton(         // a button
          onPressed: () {},
          child: Text('Click'),
        ),
      ],
    ),
  ),
)
// → a WIDGET TREE: Scaffold > Center > Column > [Text, Button]
```

Widget sanyat dadi **pohon widget** — komposisi minangka pola utama (nggabungake widget prasaja dadi UI sing rumit).

## Widget iku durung bisa diganti; konfigurasi

```text
→ Widgets are IMMUTABLE descriptions of the UI (configuration, not the actual rendered
  objects) — Flutter rebuilds them efficiently when state changes
→ build() methods return widget trees describing what the UI should look like
→ Flutter handles efficiently turning widgets into rendered pixels
```

## Mengapa penting

Paham babagan widget dadi panguru penting ing Flutter amarga **kabeh ing Flutter iku widget** — kabeh UI dibangun saka widget — mula ngerti model widget iku ilmu dhasar sing perlu, penting banget kanggo pembangunan Flutter apa wae.

Konsep utama — yen elemen sing katon (teks, tombol, gambar), struktur tata letak (baris, kolom, padding), struktur kaca, lan malah aplikasi dhéwé minangka **kabeh widget** — minangka ciri khas babagan cara Flutter bisa dikandheng, lan ngerti bab iki minangka langkah mula kanggo ngrancang UI Flutter apa wae.

Paham manawa UI dibangun kanthi **nyusun widget dadi pohon** (widget sanyat, nggabungake sing prasaja dadi antarmuka kompleks) minangka pola panguru pembangunan Flutter — komposisi tinimbang warisan, ngrancang UI rumit saka blok bangunan prasaja sing bisa dipaké manèh.

Paham manawa **widget minangka katrangan durung bisa diganti** babagan UI (konfigurasi tinimbang obyek sing ditampilake, kanthi Flutter ngganti kanthi efisien nalika kaadaan berubah) penting kanggo ngerti cara model UI deklaratif Flutter bisa dikandheng — sampeyan katrangan apa sing kudu katon UI, lan Flutter nangani penampilan kanthi efisien.

Model widget lan komposisi iki dadi batis kabeh ing Flutter: tata letak, gaya, pengelolaan kaadaan, lan struktur kabeh bisa dikandheng liwat widget.

Kamangka widget minangka unit atom Flutter (kabeh iku widget, UI minangka pohon widget dibangun kanthi komposisi) lan paham model iki minangka batis paling panguru kanggo ngrancang UI Flutter, paham widget — yen kabeh iku widget, komposisi dadi pohon, lan sifat deklaratif durung bisa diganti — minangka ilmu Flutter pang-perlu, batis paling panguru, konsep inti sing aspek pembangunan Flutter apa wae bisa diadeg duwur-duweré lan perkara pang-mula sing kudu digerti nalika sinau Flutter.