I'm working on a desktop application with flutter (Windows), I need to set up an AlertDialog if the user tries to close the window with the close button.
If someone has an idea or even a solution, I'll take it :D
I have attached a reference image below.
window_manager now supports this.
import 'package:flutter/cupertino.dart';
import 'package:window_manager/window_manager.dart';
class HomePage extends StatefulWidget {
@override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> with WindowListener {
@override
void initState() {
windowManager.addListener(this);
_init();
super.initState();
}
@override
void dispose() {
windowManager.removeListener(this);
super.dispose();
}
void _init() async {
// Add this line to override the default close handler
await windowManager.setPreventClose(true);
setState(() {});
}
@override
Widget build(BuildContext context) {
// ...
}
@override
void onWindowClose() async {
bool _isPreventClose = await windowManager.isPreventClose();
if (_isPreventClose) {
showDialog(
context: context,
builder: (_) {
return AlertDialog(
title: Text('Are you sure you want to close this window?'),
actions: [
TextButton(
child: Text('No'),
onPressed: () {
Navigator.of(context).pop();
},
),
TextButton(
child: Text('Yes'),
onPressed: () {
Navigator.of(context).pop();
await windowManager.destroy();
},
),
],
);
},
);
}
}
}
https://github.com/leanflutter/window_manager#confirm-before-closing
There is currently no built-in hook that lets you handle window close attempts; see this issue. You'd need to implement it yourself by adding a WM_CLOSE handler to win32_window.cpp, canceling the close, calling into Dart with a MethodChannel (or another similar mechanism), and then if the response from Dart indicates the window should be closed, destroying it directly.
You can use this package bitsdojo_window and in this button, CloseWindowButton(colors: closeButtonColors), you can add an onPressed callback that give you complete control to launch a dialog, or run clean up code before calling appWindow.close()
