MutableState

Artifact: androidx.compose.runtime:runtime

Added in 1.0.0

Cmn

interface MutableState<T : Any?> : State

Known direct subclasses

MutableDoubleState, MutableFloatState, MutableIntState, MutableLongState, ProduceStateScope, SnapshotMutableState

`MutableDoubleState`	A value holder where reads to the `doubleValue` property during the execution of a `Composable` function cause the current `RecomposeScope` to subscribe to changes of that value.
`MutableFloatState`	A value holder where reads to the `floatValue` property during the execution of a `Composable` function cause the current `RecomposeScope` to subscribe to changes of that value.
`MutableIntState`	A value holder where reads to the `intValue` property during the execution of a `Composable` function cause the current `RecomposeScope` to subscribe to changes of that value.
`MutableLongState`	A value holder where reads to the `longValue` property during the execution of a `Composable` function cause the current `RecomposeScope` to subscribe to changes of that value.
`ProduceStateScope`	Receiver scope for use with `produceState`.
`SnapshotMutableState`	A mutable value holder where reads to the `value` property during the execution of a `Composable` function, the current `RecomposeScope` will be subscribed to changes of that value.

A mutable value holder where reads to the value property during the execution of a Composable function, the current RecomposeScope will be subscribed to changes of that value. When the value property is written to and changed, a recomposition of any subscribed RecomposeScopes will be scheduled. If value is written to with the same value, no recompositions will be scheduled.

See also
`State`
`mutableStateOf`

Summary

Public functions
`operator T`	`component1()`	Cmn
`operator (T) -> Unit`	`component2()`	Cmn

Public properties
`T`	`value`	Cmn

Extension functions
`inline operator Unit`	`<T : Any?> MutableState<T>.setValue( thisObj: Any?, property: KProperty<*>, value: T )` Permits property delegation of `var`s using `by` for `MutableState`.	Cmn

Public functions

component1

Cmn

Added in 1.0.0

operator fun component1(): T

component2

Cmn

Added in 1.0.0

operator fun component2(): (T) -> Unit

Public properties

value

Cmn

var value: T

Extension functions

setValue

Cmn

Artifact: androidx.compose.runtime:runtime

View Source

inline operator fun <T : Any?> MutableState<T>.setValue(
    thisObj: Any?,
    property: KProperty<*>,
    value: T
): Unit

Permits property delegation of vars using by for MutableState.

import androidx.compose.material.Button
import androidx.compose.material.Text
import androidx.compose.runtime.State
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember

var count by remember { mutableStateOf(0) }

Text(text = "You clicked $count times")
Button(onClick = { count = count + 1 }) { Text("Click me") }