bitwarden-android/src/App/ViewModels/BaseViewModel.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;

namespace Bit.App.ViewModels
{
    public abstract class BaseViewModel : INotifyPropertyChanged
    {
        private string _pageTitle = string.Empty;

        public event PropertyChangedEventHandler PropertyChanged;

        public string PageTitle
        {
            get => _pageTitle;
            set => SetProperty(ref _pageTitle, value);
        }

        protected bool SetProperty<T>(ref T backingStore, T value, [CallerMemberName]string propertyName = "",
            Action onChanged = null)
        {
            if(EqualityComparer<T>.Default.Equals(backingStore, value))
            {
                return false;
            }
            backingStore = value;
            onChanged?.Invoke();
            OnPropertyChanged(propertyName);
            return true;
        }

        protected void OnPropertyChanged([CallerMemberName] string propertyName = "")
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}