Enhances state management in projects, offering a store class with builders for architecture patterns, intent actions, reducers, side effects, and state collection in composable methods.
Small piece of code store class with necessary builders to provide some architecture pattern to manage better state changes for kotlin multiplatform and compose based projects or android (check ViewModel wrapper in cheat day app.
Add dependency in gradle:
repositories {
mavenCentral()
}
// ...
dependencies {
// ...
implementation("io.github.mariuszmarzec:quickmvi:1.1.0")
// compose utils
implementation("io.github.mariuszmarzec:quickmvi-compose:1.1.0")
// ...
}
class TickerCounterStore(scope: CoroutineScope) : Store3<Int>(scope, 0) {
fun bumpCounter() = intent<Int> {
reducer { state.inc() }
sideEffect { println("Bumped to $state") }
}
}
collectState extension, you can pass optional initial action@Composable
fun TickerCounter(store: TickerCounterStore) {
val state: Int by store.collectState {
// initial action
}
Button(
modifier = Modifier.padding(16.dp),
onClick = { store.bumpCounter() }) {
Text("$state")
}
}
In onTrigger method you can define action, which will be executed after calling your intent method.
It should always return flow.
Method reducer as mentioned above contains mutations of your state, called every
time when onTrigger emit any value, if onTrigger is not set, reducer and sideEffect action will be called only
once.
In below example, action declared in sideEffect is called every time
when onTrigger flow emit value. Result of calling below code, will make state change
from current to 3 in every second until reaching 3. When 2 and 3 values
will be emitted, sideEffect action will print value in console.
fun runAction() = intent<Int>(id = "id") {
onTrigger {
flow {
delay(1000)
emit(1)
delay(1000)
emit(2)
delay(1000)
emit(3)
}
}
reducer { state = resultNonNull() }
sideEffect {
(result == || result == ) {
println()
}
}
}
Parameter id is empty by default. If it is not empty, triggered action will be
remembered and if next action with same id will be fired and previous one is still
pending, it will be killed.
You can also cancel actions with method fun cancel(vararg ids: String) as below:
fun cancel() = sideEffect {
cancel(
INTENT_SLOW_TIMER_ID,
INTENT_MEDIUM_TIMER_ID,
INTENT_QUICK_TIMER_ID
)
}
Logic inside intent could be extracted into separate classes and reuse in more than one store.
You can create a child store derived from a parent store. This allows for state hoisting and synchronized state management. The child store is linked to the parent store via two mappers.
data class ParentState(val count: Int, val name: String)
data class ChildState(val count: Int)
val parentStore = Store(scope, ParentState(0, "Parent"))
childStore = parentStore.getChildStore(
scope = childScope,
initialState = ChildState(),
parentToChild = { parent -> ChildState(parent.count) },
childToParent = { child -> copy(count = child.count) }
)
In quickmvi-compose package there is an extension for easy collecting state in compose with initial action could be at screen creation time.
val state: State<TasksScreenState> by store.collectState {
store.loadList()
store.onScheduleSelectedRequest()
}
For more use cases check:
Copyright 2025 Mariusz Marzec
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance the License.
You may obtain a copy of the License at
http:
Unless applicable law agreed to writing, software
distributed under the License distributed an BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express implied.
See the License the specific language governing permissions
limitations under the License.
Declare common interface for delegated methods:
interface TestDelegate {
fun doThings()
}
Implement new interface and open class StoreDelegate:
class TestDelegateImpl : StoreDelegate<Int>(), TestDelegate {
override fun doThings() = intent<Int> {
onTrigger { flowOf(1, 2, 3) }
reducer { state * 10 + resultNonNull() }
}
}
Make your store implement your interface and implement methods by delegation in your store. Using delegate extension install delegate in store
class TestStore(
scope: CoroutineScope,
defaultState: Int,
testDelegate: TestDelegate
) : Store4Impl<Int>(scope, defaultState), TestDelegate by testDelegate {
init {
delegates(testDelegate)
}
}
// ...
val store = TestStore(scope, 0, TestDelegateImpl())
store.doThings()
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