Created
November 22, 2020 14:43
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[BLOG] Example of ViewModel implementation with ViewState and Interactions
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| class SettingsViewModel( | |
| settingsRepository: SettingsRepository | |
| ) : ViewModel() { | |
| private var currentViewState = ViewState( | |
| firstName = "", | |
| lastName = "", | |
| notificationsChecked = false, | |
| notificationsEnabled = false | |
| ) | |
| private val _viewState = MutableLiveData<ViewState>() | |
| val viewState: LiveData<ViewState> = _viewState | |
| init { | |
| val settings = settingsRepository.settings | |
| submitViewState( | |
| ViewState( | |
| firstName = settings.firstName, | |
| lastName = settings.lastName, | |
| notificationsChecked = settings.notificationsChecked, | |
| notificationsEnabled = settings.notificationsChecked | |
| ) | |
| ) | |
| } | |
| private fun submitViewState(viewState: ViewState) { | |
| currentViewState = viewState | |
| _viewState.postValue(currentViewState) | |
| } | |
| fun onInteraction(interaction: Interaction) { | |
| when (interaction) { | |
| is NotificationSwitchChanged -> notificationsSwitchChanged(interaction.enabled) | |
| is FirstNameChange -> firstNameChanged(interaction.firstName) | |
| is LastNameChange -> lastNameChanged(interaction.lastName) | |
| is NotificationSettingButtonClick -> notificationsSettingsButtonClicked() | |
| is HelpButtonButtonClick -> helpButtonClicked() | |
| is LogOutButtonClick -> logOutButtonClicked() | |
| is AdvancedSettingsButtonClick -> advancedSettingsButtonClicked() | |
| } | |
| } | |
| private fun notificationsSwitchChanged(checked: Boolean) { | |
| submitViewState( | |
| currentViewState.copy( | |
| notificationsChecked = checked, | |
| notificationsEnabled = checked | |
| ) | |
| ) | |
| /* logic */ | |
| } | |
| private fun firstNameChanged(name: String) { | |
| /* logic */ | |
| } | |
| private fun lastNameChanged(name: String) { | |
| /* logic */ | |
| } | |
| private fun notificationsSettingsButtonClicked() { | |
| /* logic */ | |
| } | |
| private fun helpButtonClicked() { | |
| /* logic */ | |
| } | |
| private fun logOutButtonClicked() { | |
| /* logic */ | |
| } | |
| private fun advancedSettingsButtonClicked() { | |
| /* logic */ | |
| } | |
| } |
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