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add lifecycle listeners

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This commit is contained in:
Nick Fisher
2023-09-01 12:49:54 +08:00
parent b3a305b4b3
commit b739976c24
3 changed files with 106 additions and 48 deletions
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85
lib/filament_widget.dart
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@@ -4,6 +4,8 @@ import 'dart:math';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter/scheduler.dart';
import 'dart:async';
import 'filament_controller.dart';
@@ -56,38 +58,58 @@ class FilamentWidget extends StatefulWidget {
}
class _FilamentWidgetState extends State<FilamentWidget> {
StreamSubscription? _initializationListener;
StreamSubscription? _textureIdListener;
int? _textureId;
bool _resizing = false;
bool _hasViewer = false;
late final AppLifecycleListener _listener;
AppLifecycleState? _lastState;
void _handleStateChange(AppLifecycleState state) async {
switch (state) {
case AppLifecycleState.detached:
print("Detached");
await widget.controller.destroyViewer();
await widget.controller.destroyTexture();
break;
case AppLifecycleState.hidden:
print("Hidden");
_textureId = null;
await widget.controller.destroyViewer();
await widget.controller.destroyTexture();
break;
case AppLifecycleState.inactive:
print("Inactive");
break;
case AppLifecycleState.paused:
print("Paused");
break;
case AppLifecycleState.resumed:
print("Resumed");
if (_textureId == null) {
var size = ((context.findRenderObject()) as RenderBox).size;
print("Size after resuming : $size");
await widget.controller
.createViewer(size.width.toInt(), size.height.toInt());
}
break;
}
_lastState = state;
}
@override
void initState() {
_initializationListener =
widget.controller.onInitializationRequested.listen((_) {
WidgetsBinding.instance.addPostFrameCallback((timeStamp) async {
var size = ((context.findRenderObject()) as RenderBox).size;
print(
"Requesting creation of Filament back-end texture/viewer for viewport size $size");
await widget.controller
.createViewer(size.width.toInt(), size.height.toInt());
setState(() {
_hasViewer = true;
});
_listener = AppLifecycleListener(
onStateChange: _handleStateChange,
);
_initializationListener!.cancel();
_initializationListener = null;
WidgetsBinding.instance.addPostFrameCallback((timeStamp) {
var size = ((context.findRenderObject()) as RenderBox).size;
widget.controller.resize(size.width.toInt(), size.height.toInt());
print("RESIZED IN POST FRAME CALLBACK TO $size");
});
setState(() {});
});
WidgetsBinding.instance.addPostFrameCallback((timeStamp) async {
var size = ((context.findRenderObject()) as RenderBox).size;
widget.controller.setInitialSize(size.width.toInt(), size.height.toInt());
});
_textureIdListener = widget.controller.textureId.listen((int? textureId) {
print("Set texture ID to $textureId");
setState(() {
_textureId = textureId;
});
@@ -98,15 +120,14 @@ class _FilamentWidgetState extends State<FilamentWidget> {
@override
void dispose() {
_initializationListener?.cancel();
_textureIdListener?.cancel();
_listener.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return LayoutBuilder(builder: ((context, constraints) {
print("constraints $constraints");
if (_textureId == null) {
return Container(color: Colors.transparent);
}
@@ -121,10 +142,6 @@ class _FilamentWidgetState extends State<FilamentWidget> {
width: constraints.maxWidth,
child: ResizeObserver(
onResized: (Size oldSize, Size newSize) async {
if (!_hasViewer) {
return;
}
print("RESIZE OBSERVER $newSize");
WidgetsBinding.instance.addPostFrameCallback((_) async {
setState(() {
_resizing = true;
@@ -139,15 +156,15 @@ class _FilamentWidgetState extends State<FilamentWidget> {
});
});
},
child: Platform.isLinux
? _resizing
? Container()
: Transform(
child: _resizing
? Container()
: Platform.isLinux
? Transform(
alignment: Alignment.center,
transform: Matrix4.rotationX(
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?
child: texture)
: texture));
: texture));
}));
}
}