62 lines
2.3 KiB
C#
62 lines
2.3 KiB
C#
using System.ComponentModel;
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using System.Runtime.CompilerServices;
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/* Example for use:
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public class MyViewModel : ViewModelBase
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{
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private int myProperty;
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public int MyProperty
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{
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get { return myProperty; }
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set { SetProperty(ref myProperty, value);
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}
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}
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*/
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namespace FSI.Lib.MVVM
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{
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public class ViewModelBase : INotifyPropertyChanged
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{
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/// <summary>
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/// Multicast event for property change notifications.
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/// </summary>
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public event PropertyChangedEventHandler PropertyChanged;
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/// <summary>
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/// Checks if a property already matches the 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 virtual bool SetProperty<T>(ref T storage, T value, [CallerMemberName] string propertyName = null)
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{
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if (object.Equals(storage, value)) return false;
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storage = value;
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// Log.DebugFormat("{0}.{1} = {2}", this.GetType().Name, propertyName, storage);
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this.OnPropertyChanged(propertyName);
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return true;
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}
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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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protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
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{
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this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
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}
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}
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}
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