Can someone explain to me how this works? First of all, everything works fine, just as I need, but I...

# compose

[Erlan Amanatov]

Can someone explain to me how this works?
First of all, everything works fine, just as I need, but I don't understand why.
I have a composable function

@Composable
fun modified(
object1: A,
object2: B) : Boolean {...}

Where A is a Data Class, B is a regular class with MutableState variables.
I use this function to control the Button , so it's enabled only if there are any differences between the objects.

Button(
...
enabled = modified(object1, object2)
...
)

How does it work? Any changes to MutableState variables of object2 trigger the modified function?

[Zach Klippenstein (he/him) [MOD]]

Any changes to MutableState variables of object2 trigger the modified function?

Yes. When you call modified from a composable, and it reads those state values, the composable tracks those reads and will trigger recomposition of the composable that the read happened in when they change.

[Erlan Amanatov]

I thought the modified function will be called only with new object1 or object2 parameters, not by their properties

[Adam Powell]

composable functions track any snapshot state read while the composable function was executing and will invalidate if a new snapshot is committed with changes to those objects

[Adam Powell]

and compose UI does the same for layout and drawing