focusTarget

Functions summary

Modifier

Add this modifier to a component to make it focusable.
Cmn

Functions

Modifier.focusTarget

Cmn 
fun Modifier.focusTarget(): Modifier

Add this modifier to a component to make it focusable.

Focus state is stored within this modifier. The bounds of this modifier reflect the bounds of the focus box.

Note: This is a low level modifier. Before using this consider using Modifier.focusable(). It uses a focusTarget in its implementation. Modifier.focusable() adds semantics that are needed for accessibility.

import androidx.compose.foundation.border
import androidx.compose.foundation.layout.Box
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.Modifier
import androidx.compose.ui.focus.focusTarget
import androidx.compose.ui.focus.onFocusChanged
import androidx.compose.ui.graphics.Color.Companion.Black
import androidx.compose.ui.graphics.Color.Companion.Green
import androidx.compose.ui.unit.dp

var color by remember { mutableStateOf(Black) }
Box(
    Modifier.border(2.dp, color)
        // The onFocusChanged should be added BEFORE the focusTarget that is being observed.
        .onFocusChanged { color = if (it.isFocused) Green else Black }
        .focusTarget()
)