116 lines
3.0 KiB
Dart
116 lines
3.0 KiB
Dart
import 'package:flutter/material.dart';
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class FABBottomAppBarItem {
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FABBottomAppBarItem({required this.iconData, required this.text});
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IconData iconData;
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String text;
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}
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class FABBottomAppBar extends StatefulWidget {
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FABBottomAppBar({
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super.key,
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required this.items,
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this.centerItemText,
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this.height = 60.0,
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this.iconSize = 24.0,
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this.backgroundColor,
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this.color,
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this.selectedColor,
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this.notchedShape,
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this.onTabSelected,
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}) {
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assert(items.length == 2 || items.length == 4);
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}
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final List<FABBottomAppBarItem> items;
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final String? centerItemText;
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final double height;
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final double iconSize;
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final Color? backgroundColor;
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final Color? color;
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final Color? selectedColor;
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final NotchedShape? notchedShape;
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final ValueChanged<int>? onTabSelected;
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@override
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State<StatefulWidget> createState() => FABBottomAppBarState();
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}
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class FABBottomAppBarState extends State<FABBottomAppBar> {
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int _selectedIndex = 0;
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_updateIndex(int index) {
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if (widget.onTabSelected != null) widget.onTabSelected!(index);
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setState(() {
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_selectedIndex = index;
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});
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}
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@override
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Widget build(BuildContext context) {
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List<Widget> items = List.generate(widget.items.length, (int index) {
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return _buildTabItem(
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item: widget.items[index],
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index: index,
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onPressed: _updateIndex,
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);
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});
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items.insert(items.length >> 1, _buildMiddleTabItem());
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return BottomAppBar(
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shape: widget.notchedShape,
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color: widget.backgroundColor,
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child: Row(
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mainAxisSize: MainAxisSize.max,
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mainAxisAlignment: MainAxisAlignment.spaceAround,
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children: items,
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),
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);
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}
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Widget _buildMiddleTabItem() {
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return Expanded(
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child: SizedBox(
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height: widget.height,
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child: Column(
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mainAxisSize: MainAxisSize.min,
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mainAxisAlignment: MainAxisAlignment.center,
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children: <Widget>[
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SizedBox(height: widget.iconSize),
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Text(
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widget.centerItemText ?? '',
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style: TextStyle(color: widget.color),
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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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Widget _buildTabItem({required FABBottomAppBarItem item, required int index, required ValueChanged<int> onPressed}) {
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Color color = (_selectedIndex == index ? widget.selectedColor : widget.color) ?? Colors.black;
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return Expanded(
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child: SizedBox(
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height: widget.height,
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child: Material(
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type: MaterialType.transparency,
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child: InkWell(
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onTap: () => onPressed(index),
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child: Column(
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mainAxisSize: MainAxisSize.min,
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mainAxisAlignment: MainAxisAlignment.center,
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children: <Widget>[
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Icon(item.iconData, color: color, size: widget.iconSize),
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Text(
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item.text,
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style: TextStyle(color: color),
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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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);
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}
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}
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