Possible to have InteractiveViewer start at the minimum scale?

[knightlygains]

Question

I'm using an InteractiveViewer in my app but it starts zoomed in a little more than I would like. Is there a way to have it start at the minimum zoom?

Code sample

No response

Error message

No response

------------------------------------------------------

• I have searched for answers to my question both in the issues and in previous discussions.

[ndonkoHenri]

Can you share an example of what you mean? (Code, screen recording)

Also, we added some methods to the InteractiveViewer which you might find useful: https://flet.dev/docs/controls/interactiveviewer/#methods

[knightlygains]

InteractiveViewer_starts_zoomed_out.mp4

Thanks for your quick response! In the video I show the InteractiveViewer code. I'm using it to host an image of a map of a building which I then place clickable icons representing "tickets" or "work orders" for my team.
Anyways, you can see in the video that the interactive viewer starts with the content in the bottom right and it isn't at the minimum zoom. So to get the map to center, I have to zoom all the way out manually. I would like it to start the way it looks after I zoom all the way out.

I've tried the zoom method after the page.add() code and before but does not affect the zoom. The zoom method only seems to work after ft.app() has been run, so I am not sure how to programmatically run zoom() without user intervention.

[knightlygains]

I updated the margins I was using, I moved it from the content to the boundary_margin parameter in the InteractiveViewer.

map_view = ft.InteractiveViewer(
        content=ft.Container(
        content=map_gesture_detector
    ),
    max_scale=15,
    min_scale=0.01,
    scale_factor=350,
    trackpad_scroll_causes_scale=True,
    clip_behavior=ft.ClipBehavior.ANTI_ALIAS,
    constrained=False,
    on_interaction_start=on_interaction_start,
    expand=True,
    boundary_margin=ft.margin.only(top=350, left=700, right=700, bottom=350)
)

This made the problem less severe, but the issue of the InteractiveViewer not starting at the minimum zoom still remains.

[ndonkoHenri]

min_scale is the minimum allowed scale of the viewer.

The InteractiveViewer defaults to rendering your content as-is, without taking into consideration the min or max scale values. Haven't found a way to modify that behaviour.