How to hide the startup window?

[jet10000]

Kapture.2022-09-19.at.20.44.18.mp4

Always have a window flashing in the middle of the screen at startup

[FeodorFitsner]

You mean this: https://flet.dev/docs/controls/page#window_visible?

[jet10000]

I tried it and it doesn't solve the problem.

[FeodorFitsner]

What OS are you running on?

[jet10000]

[jet10000]

I tested the window_manager plugin in flutter, which can be hidden, avoiding showing it in the middle of the screen first, and then jumping to the right side of the screen to show it.

[jet10000]

[FeodorFitsner]

You mean your Flutter sample worked, but Flet equivalent didn't?

[jet10000]

yes

[FeodorFitsner]

Can you post complete both Flet and Flutter examples as text?

[jet10000]

The following is the main code of the two examples

flutter

Future setWindowPosition(double? top, double? left) async {
  if (Platform.isMacOS) {
    // debugPrint("setWindowPosition()");
    // var currentPos = await windowManager.getPosition();
    // if (kDebugMode) {
    //   print(currentPos);
    // }
    await windowManager.setPosition(
        // Offset(left ?? currentPos.dx, top ?? currentPos.dy),
        const Offset(1050.0, 100.0),
        animate: defaultTargetPlatform != TargetPlatform.macOS);
  }
}

void main() async {
  if (Platform.isMacOS) {
    // for macos app
    WidgetsFlutterBinding.ensureInitialized();
    // Must add this line.
    await windowManager.ensureInitialized();

    WindowOptions windowOptions = const WindowOptions(
      size: Size(350, 680),
      // center: true,
      // backgroundColor: Colors.transparent,
      skipTaskbar: false,
      // titleBarStyle: TitleBarStyle.hidden,
      title: '',
      alwaysOnTop: true,
    );
    windowManager.waitUntilReadyToShow(windowOptions, () async {
      await setWindowPosition(1000.0, 100.0);
      await windowManager.show();
      await windowManager.focus();
    });
  }
  runApp(const MyApp());
}

flet

def main(page: Page):
    # page.title = "X-Shot"
    # page.vertical_alignment = "center"
    page.window_width = 300
    page.window_top = 130
    page.window_left = 1100
    page.window_always_on_top = True
    page.scroll = True
    page.theme = theme.Theme(color_scheme_seed="green")
    # page.theme.use_material3 = True

    def copyit(e):
        page.update()

    def saveit(e):
    		page.update()

    def test123(e):
        print('afa')

    page.add(
        Row([
            ElevatedButton(text="Copy to Board", on_click=copyit),
            ElevatedButton(text="Save", on_click=saveit),
        ],
            alignment="center",
        )
    )


# flet.app(target=main, view=flet.WEB_BROWSER)
flet.app(target=main)

[FeodorFitsner]

To hide window on startup Flet app should be started as:

flet.app(target=main, view=flet.FLET_APP_HIDDEN)

note view=flet.FLET_APP_HIDDEN.

Then you should make the window visible:

    page.window_visible = True
    page.update() 

Try this full example:

def main(page: Page):
    # page.title = "X-Shot"
    # page.vertical_alignment = "center"
    page.window_width = 300
    page.window_top = 130
    page.window_left = 1100
    page.window_always_on_top = True
    page.scroll = True
    page.theme = theme.Theme(color_scheme_seed="green")
    # page.theme.use_material3 = True
    page.window_visible = True
    page.update() 

    def copyit(e):
        page.update()

    def saveit(e):
    		page.update()

    def test123(e):
        print('afa')

    page.add(
        Row([
            ElevatedButton(text="Copy to Board", on_click=copyit),
            ElevatedButton(text="Save", on_click=saveit),
        ],
            alignment="center",
        )
    )


flet.app(target=main, view=flet.FLET_APP_HIDDEN)

[jet10000]

Nice

[FeodorFitsner]

Did it work?

[jet10000]

It's worked. 🍻

[jet10000]

if run pipenv run flet main.py , the window flashing display again. if run pipenv run python main.py, it's worked.

[FeodorFitsner]

Use -n (--hidden) parameter:

pipenv run flet main.py -n

[AthenaRoland]

How to hide the app window instead of exiting with the close button？

[feb-cloud]

@FeodorFitsner

My test environment:
Python 3.8.13
Windows-10-10.0.19045-SP0

Tested Flet versions: Every release from 0.23.2 - 0.15.0.

Test code:

from time import sleep

import flet as ft

def main(page: ft.Page):
page.add(ft.Text("Hello!"))

sleep(3)

page.window_visible = True
page.update()

ft.app(main, view=ft.AppView.FLET_APP_HIDDEN)

Conclusion: view=ft.AppView.FLET_APP_HIDDEN is no longer effective since 0.16.0, but it is effective in 0.15.0.

I tested another version to be released, 0.24.0.dev3317, and the problem still exists.

[hschneider]

This workaround does not work on Flet >0.80 anymore.
Any hints?

[hschneider]

Got it!

    page.window.visible = True
    page.window.update()
...
ft.run(main, view=ft.AppView.FLET_APP_HIDDEN)

page.window.update() did the trick. No sleep(3) required.

[hschneider]

OK, this works like a charm when using flet run -r, but not with the compiled app.
When starting the macOS App Bundle, the small white window shows up again.

[ndonkoHenri]

See this: https://flet.dev/docs/publish/#hidden-app-window-on-startup

[hschneider]

Setting

[tool.flet.app]    # or [tool.flet.<PLATFORM>.app]
hide_window_on_start = true

and

    page.window.visible = True
    page.update()

ft.run(main, view=ft.AppView.FLET_APP_HIDDEN)

results in a permanently hidden window under macOS.
Nothing shows up at all.