87 lines
3.4 KiB
Dart
87 lines
3.4 KiB
Dart
import 'package:flutter/material.dart';
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/// For some reason original [SegmentedButton] does not have animations.
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///
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/// The [SegmentedButtons] was written for SelfPrivacy before [SegmentedButton] was introduced.
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/// While it doesn't have that much options to pass, it has cute little animation.
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/// It is based on [ToggleButtons].
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class SegmentedButtons extends StatelessWidget {
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/// Creates a segmented buttons widget. This is a SelfPrivacy implementation.
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///
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/// Provide the button titles in [titles] as a [List<String>].
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/// Current selection is provided in [isSelected] as a [List<bool>].
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/// This widget will call [onPressed] with the index of the button that was pressed.
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const SegmentedButtons({
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required this.isSelected,
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required this.onPressed,
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required this.titles,
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super.key,
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});
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/// The current selection state of the buttons.
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///
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/// The length of this list must be equal to the length of [titles].
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/// Several buttons can be selected at the same time.
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final List<bool> isSelected;
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/// The callback that is called when a button is pressed.
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/// It will be called with the index of the button that was pressed.
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final Function(int)? onPressed;
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/// The titles of the buttons.
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final List<String> titles;
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@override
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Widget build(final BuildContext context) => LayoutBuilder(
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builder: (final context, final constraints) => ToggleButtons(
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constraints: BoxConstraints(
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minWidth: (constraints.maxWidth - 8) / titles.length,
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minHeight: 40 + Theme.of(context).visualDensity.vertical * 4,
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),
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borderRadius: BorderRadius.circular(48),
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borderColor: Theme.of(context).colorScheme.outline,
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selectedBorderColor: Theme.of(context).colorScheme.outline,
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fillColor: Theme.of(context).colorScheme.secondaryContainer,
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selectedColor: Theme.of(context).colorScheme.onSecondaryContainer,
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color: Theme.of(context).colorScheme.onSurface,
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isSelected: isSelected,
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onPressed: onPressed,
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children: titles.asMap().entries.map((final entry) {
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final index = entry.key;
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final title = entry.value;
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return Stack(
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alignment: Alignment.centerLeft,
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children: [
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AnimatedOpacity(
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duration: const Duration(milliseconds: 200),
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opacity: isSelected[index] ? 1 : 0,
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child: AnimatedScale(
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duration: const Duration(milliseconds: 200),
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curve: Curves.easeInOutCubicEmphasized,
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alignment: Alignment.centerLeft,
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scale: isSelected[index] ? 1 : 0,
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child: Icon(
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Icons.check,
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size: 18,
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color: Theme.of(context).colorScheme.onSecondaryContainer,
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),
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),
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),
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AnimatedPadding(
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padding: isSelected[index]
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? const EdgeInsets.only(left: 24)
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: EdgeInsets.zero,
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duration: const Duration(milliseconds: 200),
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curve: Curves.easeInOutCubicEmphasized,
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child: Text(
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title,
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style: Theme.of(context).textTheme.labelLarge,
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),
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),
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],
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);
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}).toList(),
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),
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);
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}
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