116 lines
2.6 KiB
Dart
116 lines
2.6 KiB
Dart
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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