Created
July 28, 2021 14:39
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/* | |
* Copyright (C) 2018 The Android Open Source Project | |
* | |
* 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 com.jephtecolin.kwii.util | |
import androidx.lifecycle.ViewModel | |
import androidx.databinding.Bindable | |
import androidx.databinding.Observable | |
import androidx.databinding.PropertyChangeRegistry | |
/** | |
* An [Observable] [ViewModel] for Data Binding. | |
*/ | |
open class ObservableViewModel : ViewModel(), Observable { | |
private val callbacks: PropertyChangeRegistry by lazy { PropertyChangeRegistry() } | |
override fun addOnPropertyChangedCallback(callback: Observable.OnPropertyChangedCallback) { | |
callbacks.add(callback) | |
} | |
override fun removeOnPropertyChangedCallback(callback: Observable.OnPropertyChangedCallback) { | |
callbacks.remove(callback) | |
} | |
/** | |
* Notifies listeners that all properties of this instance have changed. | |
*/ | |
@Suppress("unused") | |
fun notifyChange() { | |
callbacks.notifyCallbacks(this, 0, null) | |
} | |
/** | |
* Notifies listeners that a specific property has changed. The getter for the property | |
* that changes should be marked with [Bindable] to generate a field in | |
* `BR` to be used as `fieldId`. | |
* | |
* @param fieldId The generated BR id for the Bindable field. | |
*/ | |
fun notifyPropertyChanged(fieldId: Int) { | |
callbacks.notifyCallbacks(this, fieldId, null) | |
} | |
} |
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