allprojects {
    repositories {
        ...
        maven { url 'https://jitpack.io' }
    }
}

dependencies {
    implementation 'com.github.marcellogalhardo:staccato:Tag'
}

class MainActivity : ComponentActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            StaccatoHost(
                // Optional parameter, only required when running on Android.
                isChangingConfigurations = { this@MainActivity.isChangingConfigurations }
            ) {
                // Creates a single instance shared by all scopes of StaccatoHost.
                val httpClient = singleton { HttpClient() }

                // Creates a new scope.
                StaccatoScope {
                    // Creates a ViewModel inside the `StaccatoScope`
                    // if the scope is disposed, so is the ViewModel.
                    val viewModel = scoped { MyViewModel1(httpClient) }
                    Component1(viewModel) // renders the UI.
                }
            }
        }
    }
}

val HttpClientProvider = Provider {
    singleton { HttpClient() }
}

val MyViewModelProvider = Provider {
    val httpClient = HttpClientProvider.get()
    scoped { MyViewModel(httpClient) }
}

val MyViewModelProvider = {
    val httpClient = HttpClientProvider.get()
    scoped { MyViewModel(httpClient) }
}

val MyViewModelProvider = { id: Int ->
    val httpClient = HttpClientProvider.get()
    scoped(key1 = id) { MyViewModel(id, httpClient) }
}

// Previous example
class MainActivity : ComponentActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val isChangingConfigurations = { isChangingConfigurations }
        setContent {
            StaccatoHost(isChangingConfigurations) {
                StaccatoScope {
                    val viewModel = MyViewModelProvider.get()
                    Component1(viewModel) // renders the UI.
                }
            }
        }
    }
}

// Now, the StaccatoScope will connect to the `navBackStackEntry` and only // remove from the memory if the `navBackStackEntry` is also removed. StaccatoScope(navBackStackEntry) { // Same API. val viewModel = MyViewModelProvider.get() Component1(viewModel) // renders the UI. } } } } ">

@Composable
private fun NavRouting() {
    val navController = rememberNavController()
    NavHost(navController, startDestination = "launch") {
        composable("launch") { navBackStackEntry ->
            // Now, the StaccatoScope will connect to the `navBackStackEntry` and only
            // remove from the memory if the `navBackStackEntry` is also removed.
            StaccatoScope(navBackStackEntry) {
                // Same API.
                val viewModel = MyViewModelProvider.get()
                Component1(viewModel) // renders the UI.
            }
        }
    }
}

val MyViewModelProvider = Provider {
    val httpClient = HttpClientProvider.get()
    val saver = MyViewModelSaver()
    scoped(saver) { MyViewModel(httpClient) }
}

val MyViewModelProvider = Provider {
    val httpClient = HttpClientProvider.get()
    scoped(onClose = { vm -> vm.close() }) { MyViewModel(httpClient) }
}

@Before
fun setUp() {
    HttpClientProvider.replace {
        // Creates fake version of HttpClient or whatever.
    }
    // Now `HttpClientProvider` will always return the return you choose.
}

Copyright 2021 Marcello Galhardo

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.