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Refactoring the package structure and adding a ViewModel
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| /* | ||
| * Copyright 2018 Google, Inc. | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
||
| package io.plaidapp.core.designernews.login.ui | ||
|
|
||
| import android.arch.lifecycle.LiveData | ||
| import android.arch.lifecycle.MutableLiveData | ||
| import android.arch.lifecycle.ViewModel | ||
| import io.plaidapp.core.data.CoroutinesContextProvider | ||
| import io.plaidapp.core.data.Result | ||
| import io.plaidapp.core.designernews.login.data.LoginRepository | ||
| import io.plaidapp.core.util.exhaustive | ||
| import kotlinx.coroutines.experimental.Job | ||
| import kotlinx.coroutines.experimental.launch | ||
|
|
||
| /** | ||
| * View Model for [DesignerNewsLogin] | ||
| * TODO move the rest of the logic from activity here. | ||
| * TODO keep this in core for now, to be moved to designernews module | ||
| */ | ||
| class LoginViewModel( | ||
| private val loginRepository: LoginRepository, | ||
| private val contextProvider: CoroutinesContextProvider | ||
| ) : ViewModel() { | ||
|
|
||
| private var currentJob: Job? = null | ||
|
|
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| private val _uiState = MutableLiveData<Result<LoginUiModel>>() | ||
| val uiState: LiveData<Result<LoginUiModel>> | ||
| get() = _uiState | ||
|
|
||
| fun login(username: String, password: String) { | ||
| // only allow one login at a time | ||
| if (currentJob?.isActive == true) { | ||
| return | ||
| } | ||
| currentJob = launchLogin(username, password) | ||
| } | ||
|
|
||
| private fun launchLogin(username: String, password: String) = launch(contextProvider.io) { | ||
| _uiState.postValue(Result.Loading) | ||
| val result = loginRepository.login(username, password) | ||
|
|
||
| when (result) { | ||
| is Result.Success -> { | ||
| val user = result.data | ||
| val uiModel = LoginUiModel( | ||
| user.displayName.toLowerCase(), | ||
| user.portraitUrl | ||
| ) | ||
| _uiState.postValue(Result.Success(uiModel)) | ||
| } | ||
| is Result.Error -> _uiState.postValue(result) | ||
| is Result.Loading -> { | ||
| /* we ignore the loading state */ | ||
| } | ||
| }.exhaustive | ||
| } | ||
|
|
||
| override fun onCleared() { | ||
| super.onCleared() | ||
| // when the VM is destroyed, cancel the running job. | ||
| currentJob?.cancel() | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * UI model for [DesignerNewsLogin] | ||
| */ | ||
| data class LoginUiModel(val displayName: String, val portraitUrl: String?) |
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Damn, this is great! :D