BringIntoViewRequester

Can be used to send bringIntoView requests. Pass it as a parameter to Modifier.bringIntoViewRequester().

For instance, you can call bringIntoView() to make all the scrollable parents scroll so that the specified item is brought into the scroll viewport.

import androidx.compose.foundation.horizontalScroll
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.relocation.BringIntoViewRequester
import androidx.compose.foundation.relocation.bringIntoViewRequester
import androidx.compose.foundation.rememberScrollState
import androidx.compose.runtime.Composable
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.ui.Modifier
import androidx.compose.ui.focus.focusTarget
import androidx.compose.ui.focus.onFocusChanged

Row(Modifier.horizontalScroll(rememberScrollState())) {
    repeat(100) {
        val bringIntoViewRequester = remember { BringIntoViewRequester() }
        val coroutineScope = rememberCoroutineScope()
        Box(
            Modifier
                // This associates the RelocationRequester with a Composable that wants to be
                // brought into view.
                .bringIntoViewRequester(bringIntoViewRequester)
                .onFocusChanged {
                    if (it.isFocused) {
                        coroutineScope.launch {
                            // This sends a request to all parents that asks them to scroll so
                            // that this item is brought into view.
                            bringIntoViewRequester.bringIntoView()
                        }
                    }
                }
                .focusTarget()
        )
    }
}
import androidx.compose.foundation.Canvas
import androidx.compose.foundation.border
import androidx.compose.foundation.horizontalScroll
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.relocation.BringIntoViewRequester
import androidx.compose.foundation.relocation.bringIntoViewRequester
import androidx.compose.foundation.rememberScrollState
import androidx.compose.material.Button
import androidx.compose.material.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.ui.Modifier
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Rect
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.unit.dp

with(LocalDensity.current) {
    val bringIntoViewRequester = remember { BringIntoViewRequester() }
    val coroutineScope = rememberCoroutineScope()
    Column {
        Box(
            Modifier.border(2.dp, Color.Black)
                .size(500f.toDp())
                .horizontalScroll(rememberScrollState())
        ) {
            Canvas(
                Modifier.size(1500f.toDp(), 500f.toDp())
                    // This associates the RelocationRequester with a Composable that wants
                    // to be brought into view.
                    .bringIntoViewRequester(bringIntoViewRequester)
            ) {
                drawCircle(color = Color.Red, radius = 250f, center = Offset(750f, 250f))
            }
        }
        Button(
            onClick = {
                val circleCoordinates = Rect(500f, 0f, 1000f, 500f)
                coroutineScope.launch {
                    // This sends a request to all parents that asks them to scroll so that
                    // the circle is brought into view.
                    bringIntoViewRequester.bringIntoView(circleCoordinates)
                }
            }
        ) {
            Text("Bring circle into View")
        }
    }
}

Summary

Public functions
suspend Unit

Bring this item into bounds by making all the scrollable parents scroll appropriately.
Cmn

Public functions

bringIntoView

Cmn
Added in 1.1.0
suspend fun bringIntoView(rect: Rect? = null): Unit

Bring this item into bounds by making all the scrollable parents scroll appropriately.

This method will not return until this request is satisfied or a newer request interrupts it. If this call is interrupted by a newer call, this method will throw a CancellationException.

import androidx.compose.foundation.horizontalScroll
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.relocation.BringIntoViewRequester
import androidx.compose.foundation.relocation.bringIntoViewRequester
import androidx.compose.foundation.rememberScrollState
import androidx.compose.runtime.Composable
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.ui.Modifier
import androidx.compose.ui.focus.focusTarget
import androidx.compose.ui.focus.onFocusChanged

Row(Modifier.horizontalScroll(rememberScrollState())) {
    repeat(100) {
        val bringIntoViewRequester = remember { BringIntoViewRequester() }
        val coroutineScope = rememberCoroutineScope()
        Box(
            Modifier
                // This associates the RelocationRequester with a Composable that wants to be
                // brought into view.
                .bringIntoViewRequester(bringIntoViewRequester)
                .onFocusChanged {
                    if (it.isFocused) {
                        coroutineScope.launch {
                            // This sends a request to all parents that asks them to scroll so
                            // that this item is brought into view.
                            bringIntoViewRequester.bringIntoView()
                        }
                    }
                }
                .focusTarget()
        )
    }
}
import androidx.compose.foundation.Canvas
import androidx.compose.foundation.border
import androidx.compose.foundation.horizontalScroll
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.relocation.BringIntoViewRequester
import androidx.compose.foundation.relocation.bringIntoViewRequester
import androidx.compose.foundation.rememberScrollState
import androidx.compose.material.Button
import androidx.compose.material.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.ui.Modifier
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Rect
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.unit.dp

with(LocalDensity.current) {
    val bringIntoViewRequester = remember { BringIntoViewRequester() }
    val coroutineScope = rememberCoroutineScope()
    Column {
        Box(
            Modifier.border(2.dp, Color.Black)
                .size(500f.toDp())
                .horizontalScroll(rememberScrollState())
        ) {
            Canvas(
                Modifier.size(1500f.toDp(), 500f.toDp())
                    // This associates the RelocationRequester with a Composable that wants
                    // to be brought into view.
                    .bringIntoViewRequester(bringIntoViewRequester)
            ) {
                drawCircle(color = Color.Red, radius = 250f, center = Offset(750f, 250f))
            }
        }
        Button(
            onClick = {
                val circleCoordinates = Rect(500f, 0f, 1000f, 500f)
                coroutineScope.launch {
                    // This sends a request to all parents that asks them to scroll so that
                    // the circle is brought into view.
                    bringIntoViewRequester.bringIntoView(circleCoordinates)
                }
            }
        ) {
            Text("Bring circle into View")
        }
    }
}
Parameters
rect: Rect? = null

The rectangle (In local coordinates) that should be brought into view. If you don't specify the coordinates, the coordinates of the Modifier.bringIntoViewRequester() associated with this BringIntoViewRequester will be used.