128 lines
3.8 KiB
Dart
128 lines
3.8 KiB
Dart
import 'dart:io';
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import 'dart:math';
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import 'package:flutter/rendering.dart';
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import 'package:flutter/widgets.dart';
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import 'dart:async';
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import 'filament_controller.dart';
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typedef ResizeCallback = void Function(Size oldSize, Size newSize);
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class ResizeObserver extends SingleChildRenderObjectWidget {
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final ResizeCallback onResized;
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const ResizeObserver({
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Key? key,
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required this.onResized,
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Widget? child,
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}) : super(
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key: key,
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child: child,
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);
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@override
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RenderObject createRenderObject(BuildContext context) =>
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_RenderResizeObserver(onLayoutChangedCallback: onResized);
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}
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class _RenderResizeObserver extends RenderProxyBox {
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final ResizeCallback onLayoutChangedCallback;
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_RenderResizeObserver({
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RenderBox? child,
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required this.onLayoutChangedCallback,
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}) : super(child);
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late var _oldSize = size;
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@override
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void performLayout() {
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super.performLayout();
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if (size != _oldSize) {
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onLayoutChangedCallback(_oldSize, size);
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_oldSize = size;
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}
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}
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}
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class FilamentWidget extends StatefulWidget {
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final FilamentController controller;
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const FilamentWidget({Key? key, required this.controller}) : super(key: key);
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@override
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_FilamentWidgetState createState() => _FilamentWidgetState();
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}
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class _FilamentWidgetState extends State<FilamentWidget> {
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StreamSubscription? _listener;
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bool _resizing = false;
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@override
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void initState() {
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_listener = widget.controller.onInitializationRequested.listen((_) {
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WidgetsBinding.instance.addPostFrameCallback((timeStamp) async {
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var size = ((context.findRenderObject()) as RenderBox).size;
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print(
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"Requesting creation of Filament back-end texture/viewer for viewport size $size");
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await widget.controller
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.createViewer(size.width.toInt(), size.height.toInt());
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print("Filament texture/viewer created.");
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_listener!.cancel();
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_listener = null;
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});
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setState(() {});
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});
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super.initState();
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}
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void dispose() {
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_listener?.cancel();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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return StreamBuilder(
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stream: widget.controller.textureId,
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builder: (ctx, AsyncSnapshot<int?> textureId) {
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if (textureId.data == null) {
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return Container();
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}
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var texture = Texture(
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key: ObjectKey("texture_${textureId.data}"),
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textureId: textureId.data!,
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filterQuality: FilterQuality.high,
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);
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return LayoutBuilder(
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builder: ((context, constraints) => SizedBox(
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height: constraints.maxHeight,
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width: constraints.maxWidth,
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child: ResizeObserver(
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onResized: (Size oldSize, Size newSize) async {
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// setState(() {
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// _resizing = true;
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// });
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await widget.controller.resize(
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newSize.width.toInt(), newSize.height.toInt());
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setState(() {
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_resizing = false;
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});
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},
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child: Platform.isLinux
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? _resizing
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? Container()
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: Transform(
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alignment: Alignment.center,
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transform: Matrix4.rotationX(
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pi), // TODO - this rotation is due to OpenGL texture coordinate working in a different space from Flutter, can we move this to the C++ side somewhere?
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child: texture)
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: texture))));
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});
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}
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}
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