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feat: add optional flagSize parameter to customize country flag size #447

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ba011be
feat: add optional flagSize parameter to customize country flag size
Keshav-15 Feb 26, 2026
8366071
feat: add customizable flagSize for country selector and picker dialog
Keshav-15 Feb 26, 2026
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6 changes: 4 additions & 2 deletions lib/country_picker_dialog.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -46,6 +46,7 @@ class CountryPickerDialog extends StatefulWidget {
final List<Country> filteredCountries;
final PickerDialogStyle? style;
final String languageCode;
final double flagSize;

const CountryPickerDialog({
Key? key,
Expand All @@ -55,6 +56,7 @@ class CountryPickerDialog extends StatefulWidget {
required this.onCountryChanged,
required this.selectedCountry,
required this.filteredCountries,
required this.flagSize,
this.style,
}) : super(key: key);

Expand Down Expand Up @@ -124,11 +126,11 @@ class _CountryPickerDialogState extends State<CountryPickerDialog> {
? Image.asset(
'assets/flags/${_filteredCountries[index].code.toLowerCase()}.png',
package: 'intl_phone_field',
width: 32,
width: widget.flagSize,
)
: Text(
_filteredCountries[index].flag,
style: const TextStyle(fontSize: 18),
style: TextStyle(fontSize: widget.flagSize),
),
contentPadding: widget.style?.listTilePadding,
title: Text(
Expand Down
139 changes: 75 additions & 64 deletions lib/intl_phone_field.dart
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Open in desktop
Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
library intl_phone_field;

import 'dart:async';

import 'package:flutter/foundation.dart' show kIsWeb;
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
Expand Down Expand Up @@ -249,54 +250,63 @@ class IntlPhoneField extends StatefulWidget {
/// If null, default magnification configuration will be used.
final TextMagnifierConfiguration? magnifierConfiguration;

const IntlPhoneField({
Key? key,
this.formFieldKey,
this.initialCountryCode,
this.languageCode = 'en',
this.disableAutoFillHints = false,
this.obscureText = false,
this.textAlign = TextAlign.left,
this.textAlignVertical,
this.onTap,
this.readOnly = false,
this.initialValue,
this.keyboardType = TextInputType.phone,
this.controller,
this.focusNode,
this.decoration = const InputDecoration(),
this.style,
this.dropdownTextStyle,
this.onSubmitted,
this.validator,
this.onChanged,
this.countries,
this.onCountryChanged,
this.onSaved,
this.showDropdownIcon = true,
this.dropdownDecoration = const BoxDecoration(),
this.inputFormatters,
this.enabled = true,
this.keyboardAppearance,
@Deprecated('Use searchFieldInputDecoration of PickerDialogStyle instead') this.searchText = 'Search country',
this.dropdownIconPosition = IconPosition.leading,
this.dropdownIcon = const Icon(Icons.arrow_drop_down),
this.autofocus = false,
this.textInputAction,
this.autovalidateMode = AutovalidateMode.onUserInteraction,
this.showCountryFlag = true,
this.cursorColor,
this.disableLengthCheck = false,
this.flagsButtonPadding = EdgeInsets.zero,
this.invalidNumberMessage = 'Invalid Mobile Number',
this.cursorHeight,
this.cursorRadius = Radius.zero,
this.cursorWidth = 2.0,
this.showCursor = true,
this.pickerDialogStyle,
this.flagsButtonMargin = EdgeInsets.zero,
this.magnifierConfiguration,
}) : super(key: key);
/// Size of the country flag.
///
/// On web, this controls the image width.
/// On mobile, this controls the emoji font size.
///
/// Defaults to 32.0 on web and 18.0 on mobile.
final double? flagSize;

const IntlPhoneField(
{Key? key,
this.formFieldKey,
this.initialCountryCode,
this.languageCode = 'en',
this.disableAutoFillHints = false,
this.obscureText = false,
this.textAlign = TextAlign.left,
this.textAlignVertical,
this.onTap,
this.readOnly = false,
this.initialValue,
this.keyboardType = TextInputType.phone,
this.controller,
this.focusNode,
this.decoration = const InputDecoration(),
this.style,
this.dropdownTextStyle,
this.onSubmitted,
this.validator,
this.onChanged,
this.countries,
this.onCountryChanged,
this.onSaved,
this.showDropdownIcon = true,
this.dropdownDecoration = const BoxDecoration(),
this.inputFormatters,
this.enabled = true,
this.keyboardAppearance,
@Deprecated('Use searchFieldInputDecoration of PickerDialogStyle instead') this.searchText = 'Search country',
this.dropdownIconPosition = IconPosition.leading,
this.dropdownIcon = const Icon(Icons.arrow_drop_down),
this.autofocus = false,
this.textInputAction,
this.autovalidateMode = AutovalidateMode.onUserInteraction,
this.showCountryFlag = true,
this.cursorColor,
this.disableLengthCheck = false,
this.flagsButtonPadding = EdgeInsets.zero,
this.invalidNumberMessage = 'Invalid Mobile Number',
this.cursorHeight,
this.cursorRadius = Radius.zero,
this.cursorWidth = 2.0,
this.showCursor = true,
this.pickerDialogStyle,
this.flagsButtonMargin = EdgeInsets.zero,
this.magnifierConfiguration,
this.flagSize})
: super(key: key);

@override
State<IntlPhoneField> createState() => _IntlPhoneFieldState();
Expand Down Expand Up @@ -355,25 +365,25 @@ class _IntlPhoneFieldState extends State<IntlPhoneField> {
}
}

Future<void> _changeCountry() async {
Future<void> _changeCountry({required double flagSize}) async {
filteredCountries = _countryList;
await showDialog(
context: context,
useRootNavigator: false,
builder: (context) => StatefulBuilder(
builder: (ctx, setState) => CountryPickerDialog(
languageCode: widget.languageCode.toLowerCase(),
style: widget.pickerDialogStyle,
filteredCountries: filteredCountries,
searchText: widget.searchText,
countryList: _countryList,
selectedCountry: _selectedCountry,
onCountryChanged: (Country country) {
_selectedCountry = country;
widget.onCountryChanged?.call(country);
setState(() {});
},
),
languageCode: widget.languageCode.toLowerCase(),
style: widget.pickerDialogStyle,
filteredCountries: filteredCountries,
searchText: widget.searchText,
countryList: _countryList,
selectedCountry: _selectedCountry,
onCountryChanged: (Country country) {
_selectedCountry = country;
widget.onCountryChanged?.call(country);
setState(() {});
},
flagSize: flagSize),
),
);
if (mounted) setState(() {});
Expand Down Expand Up @@ -448,13 +458,14 @@ class _IntlPhoneFieldState extends State<IntlPhoneField> {
}

Container _buildFlagsButton() {
final double effectiveFlagSize = widget.flagSize ?? (kIsWeb ? 32.0 : 18.0);
return Container(
margin: widget.flagsButtonMargin,
child: DecoratedBox(
decoration: widget.dropdownDecoration,
child: InkWell(
borderRadius: widget.dropdownDecoration.borderRadius as BorderRadius?,
onTap: widget.enabled ? _changeCountry : null,
onTap: widget.enabled ? () => _changeCountry(flagSize: effectiveFlagSize) : null,
child: Padding(
padding: widget.flagsButtonPadding,
child: Row(
Expand All @@ -475,11 +486,11 @@ class _IntlPhoneFieldState extends State<IntlPhoneField> {
? Image.asset(
'assets/flags/${_selectedCountry.code.toLowerCase()}.png',
package: 'intl_phone_field',
width: 32,
width: effectiveFlagSize,
)
: Text(
_selectedCountry.flag,
style: const TextStyle(fontSize: 18),
style: TextStyle(fontSize: effectiveFlagSize),
),
const SizedBox(width: 8),
],
Expand Down