Import the source code for Window Walker (#1177)

Import the codebase for Window Walker 

- Not loaded into the module list 
- Not added it to the installer list.

src/modules/windowwalker/app/Window Walker/MainWindow.xaml.cs

@@ -0,0 +1,115 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.  Code forked from Betsegaw Tadele's https://github.com/betsegaw/windowwalker/
+
+using System;
+using System.Deployment.Application;
+using System.Windows;
+using System.Windows.Input;
+
+namespace WindowWalker
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+
+        private void UpdateDisplayedVersionNumber()
+        {
+            // Since displaying version number is not critical to functionality, we don't need to do anything if it fails.
+            try
+            {
+                Version applicationVersion = new Version("0.0.0.0");
+                if (ApplicationDeployment.IsNetworkDeployed)
+                {
+                    applicationVersion = ApplicationDeployment.CurrentDeployment.CurrentVersion;
+                }
+
+                if (ApplicationDeployment.CurrentDeployment.UpdateLocation.Host.Contains("develop"))
+                {
+                    versionDisplay.Text = "(develop) " + applicationVersion.ToString();
+                }
+                else
+                {
+                    versionDisplay.Text = applicationVersion.ToString();
+                }
+            }
+            catch
+            {
+            }
+        }
+
+        private void Window_Loaded(object sender, RoutedEventArgs e)
+        {
+            DataContext = new ViewModels.WindowWalkerViewModel(this);
+            searchBox.Focus();
+
+            UpdateDisplayedVersionNumber();
+
+            HideWindow();
+        }
+
+        private void SearchBoxKeyUp(object sender, KeyEventArgs e)
+        {
+            var viewModel = (ViewModels.WindowWalkerViewModel)DataContext;
+
+            if (e.Key == Key.Escape)
+            {
+                if (viewModel.WindowHideCommand.CanExecute(null))
+                {
+                    viewModel.WindowHideCommand.Execute(null);
+                }
+            }
+            else if (e.Key == Key.Down)
+            {
+                if (viewModel.WindowNavigateToNextResultCommand.CanExecute(null))
+                {
+                    viewModel.WindowNavigateToNextResultCommand.Execute(null);
+                }
+            }
+            else if (e.Key == Key.Up)
+            {
+                if (viewModel.WindowNavigateToPreviousResultCommand.CanExecute(null))
+                {
+                    viewModel.WindowNavigateToPreviousResultCommand.Execute(null);
+                }
+            }
+            else if (e.Key == Key.Enter)
+            {
+                if (viewModel.SwitchToSelectedWindowCommand.CanExecute(null))
+                {
+                    viewModel.SwitchToSelectedWindowCommand.Execute(null);
+                }
+            }
+        }
+
+        private void Results_MouseDoubleClick(object sender, MouseButtonEventArgs e)
+        {
+            var viewModel = (ViewModels.WindowWalkerViewModel)DataContext;
+
+            if (viewModel.SwitchToSelectedWindowCommand.CanExecute(null))
+            {
+                viewModel.SwitchToSelectedWindowCommand.Execute(null);
+            }
+        }
+
+        private void Window_Deactivated(object sender, EventArgs e)
+        {
+            HideWindow();
+        }
+
+        private void HideWindow()
+        {
+            var viewModel = (ViewModels.WindowWalkerViewModel)DataContext;
+            if (viewModel.WindowHideCommand.CanExecute(null))
+            {
+                viewModel.WindowHideCommand.Execute(null);
+            }
+        }
+    }
+}