bug: Container not displayed when adding image instance attribute in init()

[tr31zh]

Duplicate Check

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

Describe the bug

Adding an image as an instance attribute in the init method of a custom Container will make the container be displayed as a grey rectangle even if the image is not added to the container's content.

Code sample

Code

import flet as ft

@ft.control
class ImageDemo(ft.Container):
    def init(self):
        self.image = ft.Image(src="https://flet.dev/img/logo.svg")
        self.content = ft.Column(controls=[ft.Text("Foo")])


def main(page: ft.Page):
    page.title = "Image container"
    calc = ImageDemo()
    page.add(calc)


ft.run(main)

To reproduce

Run the script either in as an app

python run image_demo.py

Or as webapp

python run --web image_demo.py

Expected behavior

A label with the text "Foo" should be displayed in the window or web page.

Screenshots / Videos

Captures

[Upload media here]

Operating System

macOS

Operating system details

Tahoe 26.5.1

Flet version

0.85.3

Regression

I'm not sure / I don't know

Suggestions

No response

Logs

Logs

> uv run flet run --web  hello.py       
http://127.0.0.1:65003

Additional details

If the image is directly created inside the controls argumment or is not created at all everything works as expected.

[ndonkoHenri]

Container.image is of type DecorationImage, not Image.

Try this:

import flet as ft


@ft.control
class ImageDemo(ft.Container):
    def init(self):
        super().init()
        self.image = ft.DecorationImage(src="https://picsum.photos/200/300")
        self.content = ft.Column(controls=[ft.Text("Foo")])


def main(page: ft.Page):
    page.add(ImageDemo())


ft.run(main)