Move implementation of INotifyPropertyChanged in another class

src/FreshMvvm/FreshBasePageModel.cs

@@ -9,10 +9,8 @@
 
 namespace FreshMvvm
 {
-    public abstract class FreshBasePageModel : INotifyPropertyChanged
-    {
-        public event PropertyChangedEventHandler PropertyChanged;
-
+    public abstract class FreshBasePageModel : FreshObservableObject
+	{
         /// <summary>
         /// This event is raise when a page is Popped, this might not be raise everytime a page is Popped. 
         /// Note* this might be raised multiple times. 
@@ -55,14 +53,6 @@ public virtual void Init (object initData)
         {            
         }
 
-        protected void RaisePropertyChanged ([CallerMemberName] string propertyName = null)
-        {
-            var handler = PropertyChanged;
-            if (handler != null) {
-                handler (this, new PropertyChangedEventArgs (propertyName));
-            }
-        }
-
         internal void WireEvents (Page page)
         {
             page.Appearing += ViewIsAppearing;

src/FreshMvvm/FreshMvvm.csproj

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -31,6 +31,7 @@
     <ConsolePause>false</ConsolePause>
   </PropertyGroup>
   <ItemGroup>
+    <Compile Include="FreshObservableObject.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="FreshBasePageModel.cs" />
     <Compile Include="FreshIOC.cs" />

src/FreshMvvm/FreshObservableObject.cs

@@ -0,0 +1,57 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+
+namespace FreshMvvm
+{
+	/// <summary>
+	/// Observable object with INotifyPropertyChanged implemented
+	/// </summary>
+	public abstract class FreshObservableObject : INotifyPropertyChanged
+	{
+		/// <summary>
+		/// Occurs when property changed.
+		/// </summary>
+		public event PropertyChangedEventHandler PropertyChanged;
+
+		/// <summary>
+		/// Sets the property.
+		/// </summary>
+		/// <returns><c>true</c>, if property was set, <c>false</c> otherwise.</returns>
+		/// <param name="backingStore">Backing store.</param>
+		/// <param name="value">Value.</param>
+		/// <param name="propertyName">Property name.</param>
+		/// <param name="onChanged">On changed.</param>
+		/// <typeparam name="T">The 1st type parameter.</typeparam>
+		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;
+
+			if (onChanged != null)
+				onChanged.Invoke();
+
+			RaisePropertyChanged(propertyName);
+			return true;
+		}
+
+		/// <summary>
+		/// Raises the property changed event.
+		/// </summary>
+		/// <param name="propertyName">Property name.</param>
+		protected void RaisePropertyChanged([CallerMemberName] string propertyName = null)
+		{
+			var handler = PropertyChanged;
+			if (handler != null)
+			{
+				handler(this, new PropertyChangedEventArgs(propertyName));
+			}
+		}
+	}
+}