basic setup (layout + icons)
This commit is contained in:
115
flutter/lib/bottom_fab/anchored_overlay.dart
Normal file
115
flutter/lib/bottom_fab/anchored_overlay.dart
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import 'package:flutter/material.dart';
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class AnchoredOverlay extends StatelessWidget {
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final bool showOverlay;
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final Widget Function(BuildContext, Offset anchor) overlayBuilder;
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final Widget child;
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const AnchoredOverlay({
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super.key,
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required this.showOverlay,
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required this.overlayBuilder,
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required this.child,
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});
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@override
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Widget build(BuildContext context) {
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return LayoutBuilder(builder: (BuildContext context, BoxConstraints constraints) {
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return OverlayBuilder(
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showOverlay: showOverlay,
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overlayBuilder: (BuildContext overlayContext) {
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RenderBox box = context.findRenderObject() as RenderBox;
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final center = box.size.center(box.localToGlobal(const Offset(0.0, 0.0)));
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return overlayBuilder(overlayContext, center);
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},
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child: child,
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);
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});
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}
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}
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class OverlayBuilder extends StatefulWidget {
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final bool showOverlay;
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final Widget Function(BuildContext) overlayBuilder;
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final Widget child;
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const OverlayBuilder({
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super.key,
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this.showOverlay = false,
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required this.overlayBuilder,
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required this.child,
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});
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@override
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State<OverlayBuilder> createState() => _OverlayBuilderState();
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}
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class _OverlayBuilderState extends State<OverlayBuilder> {
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OverlayEntry? overlayEntry;
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@override
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void initState() {
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super.initState();
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if (widget.showOverlay) {
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WidgetsBinding.instance.addPostFrameCallback((_) => showOverlay());
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}
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}
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@override
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void didUpdateWidget(OverlayBuilder oldWidget) {
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super.didUpdateWidget(oldWidget);
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WidgetsBinding.instance.addPostFrameCallback((_) => syncWidgetAndOverlay());
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}
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@override
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void reassemble() {
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super.reassemble();
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WidgetsBinding.instance.addPostFrameCallback((_) => syncWidgetAndOverlay());
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}
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@override
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void dispose() {
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if (isShowingOverlay()) {
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hideOverlay();
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}
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super.dispose();
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}
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bool isShowingOverlay() => overlayEntry != null;
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void showOverlay() {
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overlayEntry = OverlayEntry(
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builder: widget.overlayBuilder,
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);
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addToOverlay(overlayEntry!);
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}
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void addToOverlay(OverlayEntry entry) async {
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print('addToOverlay');
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Overlay.of(context).insert(entry);
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}
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void hideOverlay() {
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print('hideOverlay');
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if (overlayEntry != null) {
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overlayEntry!.remove();
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overlayEntry = null;
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}
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}
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void syncWidgetAndOverlay() {
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if (isShowingOverlay() && !widget.showOverlay) {
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hideOverlay();
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} else if (!isShowingOverlay() && widget.showOverlay) {
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showOverlay();
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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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return widget.child;
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}
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}
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20
flutter/lib/bottom_fab/center_about.dart
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20
flutter/lib/bottom_fab/center_about.dart
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import 'package:flutter/material.dart';
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class CenterAbout extends StatelessWidget {
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final Offset position;
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final Widget child;
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const CenterAbout({super.key, required this.position, required this.child});
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@override
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Widget build(BuildContext context) {
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return Positioned(
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top: position.dy,
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left: position.dx,
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child: FractionalTranslation(
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translation: const Offset(-0.5, -0.5),
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child: child,
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),
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);
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}
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}
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115
flutter/lib/bottom_fab/fab_bottom_app_bar.dart
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115
flutter/lib/bottom_fab/fab_bottom_app_bar.dart
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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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80
flutter/lib/bottom_fab/fab_with_icons.dart
Normal file
80
flutter/lib/bottom_fab/fab_with_icons.dart
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@@ -0,0 +1,80 @@
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import 'package:flutter/material.dart';
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// https://stackoverflow.com/questions/46480221/flutter-floating-action-button-with-speed-dail
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class FabWithIcons extends StatefulWidget {
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FabWithIcons({required this.icons, required this.onIconTapped});
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final List<IconData> icons;
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ValueChanged<int> onIconTapped;
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@override
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State createState() => FabWithIconsState();
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}
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class FabWithIconsState extends State<FabWithIcons> with TickerProviderStateMixin {
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late AnimationController _controller;
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@override
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void initState() {
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super.initState();
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_controller = AnimationController(
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vsync: this,
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duration: const Duration(milliseconds: 250),
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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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return Column(
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mainAxisAlignment: MainAxisAlignment.center,
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mainAxisSize: MainAxisSize.min,
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children: List.generate(widget.icons.length, (int index) {
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return _buildChild(index);
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}).toList()
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..add(
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_buildFab(),
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),
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);
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}
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Widget _buildChild(int index) {
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Color backgroundColor = Theme.of(context).cardColor;
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Color foregroundColor = Theme.of(context).secondaryHeaderColor;
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return Container(
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height: 70.0,
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width: 56.0,
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alignment: FractionalOffset.topCenter,
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child: ScaleTransition(
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scale: CurvedAnimation(
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parent: _controller,
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curve: Interval(0.0, 1.0 - index / widget.icons.length / 2.0, curve: Curves.easeOut),
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),
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child: FloatingActionButton(
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backgroundColor: backgroundColor,
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mini: true,
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child: Icon(widget.icons[index], color: foregroundColor),
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onPressed: () => _onTapped(index),
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),
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),
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);
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}
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Widget _buildFab() {
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return FloatingActionButton(
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onPressed: () {
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if (_controller.isDismissed) {
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_controller.forward();
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} else {
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_controller.reverse();
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}
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},
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tooltip: 'Increment',
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child: Icon(Icons.add),
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elevation: 2.0,
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);
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}
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void _onTapped(int index) {
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_controller.reverse();
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widget.onIconTapped(index);
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}
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}
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