50 lines
2.2 KiB
C#
50 lines
2.2 KiB
C#
using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Runtime.CompilerServices;
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namespace DeepSpeech.WPF.ViewModels
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{
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/// <summary>
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/// Implementation of <see cref="INotifyPropertyChanged"/> to simplify models.
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/// </summary>
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public abstract class BindableBase : INotifyPropertyChanged
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{
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/// <summary>
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/// Checks if a property already matches a desired value. Sets the property and
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/// notifies listeners only when necessary.
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/// </summary>
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/// <typeparam name="T">Type of the property.</typeparam>
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/// <param name="storage">Reference to a property with both getter and setter.</param>
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/// <param name="value">Desired value for the property.</param>
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/// <param name="propertyName">Name of the property used to notify listeners. This
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/// value is optional and can be provided automatically when invoked from compilers that
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/// support CallerMemberName.</param>
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/// <returns>True if the value was changed, false if the existing value matched the
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/// desired value.</returns>
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protected bool SetProperty<T>(ref T backingStore, T value,
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[CallerMemberName]string propertyName = "",
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Action onChanged = null)
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{
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if (EqualityComparer<T>.Default.Equals(backingStore, value))
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return false;
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backingStore = value;
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onChanged?.Invoke();
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OnPropertyChanged(propertyName);
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return true;
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}
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#region INotifyPropertyChanged
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/// <summary>
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/// Notifies listeners that a property value has changed.
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/// </summary>
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/// <param name="propertyName">Name of the property used to notify listeners. This
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/// value is optional and can be provided automatically when invoked from compilers
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/// that support <see cref="CallerMemberNameAttribute"/>.</param>
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public event PropertyChangedEventHandler PropertyChanged;
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protected void OnPropertyChanged([CallerMemberName] string propertyName = "")
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=> PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
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#endregion
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}
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}
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