Cannot trigger WindowEventType.CLOSE

[hionwi]

Duplicate Check

• [X] I have searched the opened issues and there are no duplicates

Describe the bug

I Cannot trigger WindowEventType.CLOSE when I close the windows

Code sample

Code

```python import flet as ft def main(page: ft.Page): page.add(ft.Text("Hello, World!")) page.window.on_event = lambda e: print(e) ft.app(main) ```

To reproduce

Run the code and close the window. The console does not print the WindowEventType.CLOSEinformation. But WindowEventType.MOVED，WindowEventType.BLUR，WindowEventType.FOCUS is OK

Expected behavior

No response

Screenshots / Videos

Captures

[Upload media here]

Operating System

Windows

Operating system details

windows 11

Flet version

0.24.1

Regression

I'm not sure / I don't know

Suggestions

No response

Logs

Logs

```console [Paste your logs here] ```

Additional details

No response

[ndonkoHenri]

Issue is reproducible on windows, but not mac.

[OwenMcDonnell]

This issue seems to be a problem of synchronization of communication between Python and Flutter. It seems that there isn't time for the close event to be dispatched to the Python side before it closes.

You might try a different approach such as the example below.

import flet as ft

def main(page: ft.Page):

    def window_event(e):

        print(e)
        if e.data == "close":
            page.window.destroy()         

    page.window.prevent_close = True
    page.window.on_event = window_event

    page.add(ft.Text("Hello, World!"))

ft.app(main)