101 lines
3.0 KiB
Dart
101 lines
3.0 KiB
Dart
import 'package:flutter/material.dart';
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class DefaultAppBarSearchField extends StatefulWidget {
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final TextEditingController searchController;
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final void Function(String) onChanged;
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final Widget suffix;
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final bool autofocus;
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final String prefixText;
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final String hintText;
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const DefaultAppBarSearchField({
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Key key,
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this.searchController,
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this.onChanged,
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this.suffix,
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this.autofocus = false,
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this.prefixText,
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this.hintText,
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}) : super(key: key);
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@override
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_DefaultAppBarSearchFieldState createState() =>
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_DefaultAppBarSearchFieldState();
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}
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class _DefaultAppBarSearchFieldState extends State<DefaultAppBarSearchField> {
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final FocusNode _focusNode = FocusNode();
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TextEditingController _searchController;
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bool _lastTextWasEmpty = false;
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void _updateSearchController() {
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final thisTextIsEmpty = _searchController.text?.isEmpty ?? false;
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if (_lastTextWasEmpty != thisTextIsEmpty) {
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setState(() => _lastTextWasEmpty = thisTextIsEmpty);
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}
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}
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@override
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void initState() {
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super.initState();
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_searchController = widget.searchController ?? TextEditingController();
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// we need to remove the listener in the dispose method, so we need a reference to the callback
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_searchController.addListener(_updateSearchController);
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_focusNode.addListener(() => setState(() => null));
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}
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@override
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void dispose() {
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_focusNode.dispose();
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_searchController.removeListener(_updateSearchController);
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if (widget.searchController == null) {
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// we need to dispose our own created searchController
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_searchController.dispose();
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}
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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return Container(
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height: 40,
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padding: EdgeInsets.only(right: 16),
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child: Material(
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color: Theme.of(context).secondaryHeaderColor,
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borderRadius: BorderRadius.circular(32),
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child: TextField(
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autofocus: widget.autofocus,
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autocorrect: false,
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controller: _searchController,
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onChanged: widget.onChanged,
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focusNode: _focusNode,
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decoration: InputDecoration(
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prefixText: widget.prefixText,
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contentPadding: EdgeInsets.only(
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top: 8,
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bottom: 8,
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left: 16,
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),
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border: OutlineInputBorder(
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borderRadius: BorderRadius.circular(32),
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),
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hintText: widget.hintText,
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suffixIcon: _focusNode.hasFocus ||
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(widget.suffix == null &&
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(_searchController.text?.isNotEmpty ?? false))
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? IconButton(
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icon: Icon(Icons.backspace_outlined),
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onPressed: () {
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_searchController.clear();
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widget.onChanged?.call('');
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_focusNode.unfocus();
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},
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)
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: widget.suffix,
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),
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),
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),
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);
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}
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}
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