From 1286066abc1db009f33cc1f0a8e1dc7aefc4aadb Mon Sep 17 00:00:00 2001
From: Tracy Pearson <tracypearson@tracypearson.com>
Date: Thu, 11 Aug 2022 22:50:48 -0400
Subject: [PATCH] Basic setup completed

---
 WpfViewModelFirst/App.xaml               |  3 +-
 WpfViewModelFirst/App.xaml.cs            |  6 +++
 WpfViewModelFirst/CustomCommand.cs       | 49 ++++++++++++++++++++++++
 WpfViewModelFirst/MainWindowViewModel.cs | 13 +++++++
 WpfViewModelFirst/ObservableObject.cs    | 31 +++++++++++++++
 WpfViewModelFirst/ViewModelBase.cs       | 13 +++++++
 6 files changed, 113 insertions(+), 2 deletions(-)
 create mode 100644 WpfViewModelFirst/CustomCommand.cs
 create mode 100644 WpfViewModelFirst/MainWindowViewModel.cs
 create mode 100644 WpfViewModelFirst/ObservableObject.cs
 create mode 100644 WpfViewModelFirst/ViewModelBase.cs

diff --git a/WpfViewModelFirst/App.xaml b/WpfViewModelFirst/App.xaml
index 16cc4cd..511a951 100644
--- a/WpfViewModelFirst/App.xaml
+++ b/WpfViewModelFirst/App.xaml
@@ -1,8 +1,7 @@
 <Application x:Class="WpfViewModelFirst.App"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             xmlns:local="clr-namespace:WpfViewModelFirst"
-             StartupUri="MainWindow.xaml">
+             xmlns:local="clr-namespace:WpfViewModelFirst">
     <Application.Resources>
          
     </Application.Resources>
diff --git a/WpfViewModelFirst/App.xaml.cs b/WpfViewModelFirst/App.xaml.cs
index 3a8b1c9..63bec40 100644
--- a/WpfViewModelFirst/App.xaml.cs
+++ b/WpfViewModelFirst/App.xaml.cs
@@ -13,5 +13,11 @@ namespace WpfViewModelFirst
     /// </summary>
     public partial class App : Application
     {
+        protected override void OnStartup(StartupEventArgs e)
+        {
+            base.OnStartup(e);
+            MainWindow mainWindow = new() { DataContext = new MainWindowViewModel() };
+            mainWindow.Show();
+        }
     }
 }
diff --git a/WpfViewModelFirst/CustomCommand.cs b/WpfViewModelFirst/CustomCommand.cs
new file mode 100644
index 0000000..05643ac
--- /dev/null
+++ b/WpfViewModelFirst/CustomCommand.cs
@@ -0,0 +1,49 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Input;
+
+namespace WpfViewModelFirst
+{
+    public class CustomCommand : ICommand 
+    {
+        private readonly Action<object?> _execute;
+        private readonly Predicate<object?>? _canExecute;
+
+        public CustomCommand(Action<object?> execute, Predicate<object?> canExecute)
+        {
+            _execute = execute;
+            _canExecute = canExecute;
+        }
+
+        public CustomCommand(Action<object?> execute)
+        {
+            _execute = execute;
+        }
+
+        public bool CanExecute(object? parameter)
+        {
+            return _canExecute == null || _canExecute(parameter);
+        }
+
+        public event EventHandler? CanExecuteChanged
+        {
+            add
+            {
+                CommandManager.RequerySuggested += value;
+            }
+            remove
+            {
+                CommandManager.RequerySuggested -= value;
+            }
+        }
+
+        public void Execute(object? parameter)
+        {
+            _execute(parameter);
+        }
+
+    }
+}
diff --git a/WpfViewModelFirst/MainWindowViewModel.cs b/WpfViewModelFirst/MainWindowViewModel.cs
new file mode 100644
index 0000000..e15da55
--- /dev/null
+++ b/WpfViewModelFirst/MainWindowViewModel.cs
@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace WpfViewModelFirst
+{
+    public class MainWindowViewModel : ViewModelBase
+    {
+
+    }
+}
diff --git a/WpfViewModelFirst/ObservableObject.cs b/WpfViewModelFirst/ObservableObject.cs
new file mode 100644
index 0000000..9fc48f9
--- /dev/null
+++ b/WpfViewModelFirst/ObservableObject.cs
@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace WpfViewModelFirst
+{
+    public class ObservableObject
+    {
+        public event PropertyChangedEventHandler? PropertyChanged;
+        protected virtual void RaisePropertyChanged([CallerMemberName] string propertyName = "")
+        {
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
+
+        protected virtual bool Set<T>(ref T storage, T value, [CallerMemberName] string propertyName = "")
+        {
+            if (EqualityComparer<T>.Default.Equals(storage, value))
+            {
+                return false;
+            }
+            storage = value;
+            this.RaisePropertyChanged(propertyName);
+            return true;
+        }
+
+    }
+}
diff --git a/WpfViewModelFirst/ViewModelBase.cs b/WpfViewModelFirst/ViewModelBase.cs
new file mode 100644
index 0000000..fd3023c
--- /dev/null
+++ b/WpfViewModelFirst/ViewModelBase.cs
@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace WpfViewModelFirst
+{
+    public class ViewModelBase : ObservableObject
+    {
+
+    }
+}