﻿/*
 * Copyright 2015 Benjamin Gale.
 *
 * 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.
 */
using System.Collections.Generic;
using System.ComponentModel;

namespace BenjaminGale.ModalContentPresenter.TestApplication
{
    public abstract class ObservableObject : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        protected bool SetProperty<T>(ref T field, T value, string propertyName)
        {
            bool propertyHasChanged = !EqualityComparer<T>.Default.Equals(field, value);

            if (propertyHasChanged)
            {
                field = value;
                OnPropertyChanged(propertyName);
            }

            return propertyHasChanged;
        }

        protected internal virtual void OnPropertyChanged(string propertyName)
        {
            var handler = this.PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }
}
