Pm searchbar improvements

src/DynamoCoreWpf/ViewModels/PackageManager/PackageManagerSearchViewModel.cs

@@ -304,8 +304,11 @@ public string SearchText
             get { return _SearchText; }
             set
             {
-                _SearchText = value;
-                RaisePropertyChanged("SearchText");
+                if(_SearchText != value)
+                {
+                    _SearchText = value;
+                    RaisePropertyChanged("SearchText");
+                }
             }
         }
 
@@ -1059,19 +1062,24 @@ public bool TimedOut
             }
         }
 
+        private System.Timers.Timer aTimer;
+
         private void StartTimer()
         {
-            var aTimer = new System.Timers.Timer();
+            if(aTimer == null) 
+                aTimer = new System.Timers.Timer();
+
             aTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);
             aTimer.Interval = MAX_LOAD_TIME;
             aTimer.AutoReset = false;
             aTimer.Enabled = true;
+            aTimer.Start();
         }
 
         private void OnTimedEvent(object sender, ElapsedEventArgs e)
         {
             var aTimer = (System.Timers.Timer)sender;
-            aTimer.Dispose();
+            aTimer.Stop();
 
             // If we have managed to get all the results
             // Simply dispose of the timer
@@ -1564,12 +1572,20 @@ public void DisableSearchTextBox()
         /// <summary>
         /// Clear after closing down
         /// </summary>
-        internal void Close()
+        internal void PackageManagerViewClose()
+        {
+            SearchAndUpdateResults(String.Empty); // reset the search text property
+            InitialResultsLoaded = false;
+            TimedOut = false;
+        }
+
+        /// <summary>
+        /// Remove PackageManagerSearchViewModel resources
+        /// </summary>
+        internal void Dispose()
         {
-            TimedOut = false;   // reset the timedout screen 
-            InitialResultsLoaded = false;   // reset the loading screen settings
-            RequestShowFileDialog -= OnRequestShowFileDialog;
-            nonHostFilter.ForEach(f => f.PropertyChanged -= filter_PropertyChanged);
+             nonHostFilter?.ForEach(f => f.PropertyChanged -= filter_PropertyChanged);
+             aTimer.Elapsed -= new ElapsedEventHandler(OnTimedEvent);
         }
     }
 }

src/DynamoCoreWpf/Views/Core/DynamoView.xaml.cs

@@ -2014,6 +2014,7 @@ private void WindowClosed(object sender, EventArgs e)
 
             this.Dispose();
             sharedViewExtensionLoadedParams?.Dispose();
+            this._pkgSearchVM?.Dispose();
         }
 
         // the key press event is being intercepted before it can get to
@@ -2274,9 +2275,11 @@ private void DynamoViewModelRequestShowPackageManager(object s, EventArgs e)
             {
                 packageManagerWindow.Navigate((e as OpenPackageManagerEventArgs).Tab);
             }
+
             _pkgSearchVM.RefreshAndSearchAsync();
         }
 
+
         internal void EnableEnvironment(bool isEnabled)
         {
             this.mainGrid.IsEnabled = isEnabled;

src/DynamoCoreWpf/Views/PackageManager/Controls/PackageManagerSearchControl.xaml

@@ -335,7 +335,8 @@
                     <!--  Search Bar  -->
                     <local:SearchBoxControl x:Name="SearchBox"
                                             DockPanel.Dock="Left"
-                                            Margin="0 5 0 0" />
+                                            Margin="0 5 0 0"
+                                            IsEnabled="{Binding Path=InitialResultsLoaded, UpdateSourceTrigger=PropertyChanged}" />
 
                 </DockPanel>
             </Border>
@@ -387,18 +388,16 @@
                         Visibility="{Binding IsAnyFilterOn, Converter={StaticResource BoolToVisibilityCollapsedConverter}, UpdateSourceTrigger=PropertyChanged}" />
             </DockPanel>
 
-
-            <local:PackageManagerPackageAnimationControl x:Name="loadingScreen"
+            <local:PackageManagerPackageAnimationControl x:Name="loadingAnimationSearchControlScreen"
                                                          Grid.Row="2"
-                                                         Visibility="{Binding Path=InitialResultsLoaded, UpdateSourceTrigger=PropertyChanged,
-                                                                Converter={StaticResource InverseBooleanToVisibilityCollapsedConverter}}" />
+                                                         Visibility="Visible" />
 
             <local:PackageManagerPackagesControl x:Name="packageManagerSearchPackages"
                                                  Grid.Row="2"
                                                  SearchItems="{Binding Path=SearchResults}"
                                                  Visibility="{Binding Path=InitialResultsLoaded, UpdateSourceTrigger=PropertyChanged,
                                                                       Converter={StaticResource BoolToVisibilityCollapsedConverter}}" />
-
+            
 
         </Grid>
 

src/DynamoCoreWpf/Views/PackageManager/Controls/PackageManagerSearchControl.xaml.cs

@@ -2,6 +2,7 @@
 using System.Windows.Controls;
 using System.Windows.Controls.Primitives;
 using System.Windows.Data;
+using Dynamo.Controls;
 using Dynamo.PackageManager.ViewModels;
 
 namespace Dynamo.PackageManager.UI
@@ -23,6 +24,18 @@ public PackageManagerSearchControl()
         private void InitializeContext(object sender, RoutedEventArgs e)
         {
             PkgSearchVM = this.DataContext as PackageManagerSearchViewModel;
+
+            if (PkgSearchVM != null)
+            {
+                // Create the binding once the DataContext is available
+                var binding = new Binding(nameof(PackageManagerSearchViewModel.InitialResultsLoaded))
+                {
+                    Source = PkgSearchVM,
+                    Converter = new InverseBooleanToVisibilityCollapsedConverter()
+                };
+
+                this.loadingAnimationSearchControlScreen.SetBinding(UIElement.VisibilityProperty, binding);
+            }
         }
 
 

src/DynamoCoreWpf/Views/PackageManager/Controls/SearchBoxControl.xaml

@@ -116,8 +116,7 @@
                             HorizontalAlignment="Stretch"
                             IsEnabled="{Binding RelativeSource={RelativeSource AncestorType=UserControl}, Path=IsEnabled}"
                             TextChanged="SearchTextBox_OnTextChanged"
-                            IsKeyboardFocusWithinChanged="SearchTextBox_OnKeyboardFocusWithinChanged"
-                            Text="{Binding SearchText, UpdateSourceTrigger=PropertyChanged}"></TextBox>
+                            IsKeyboardFocusWithinChanged="SearchTextBox_OnKeyboardFocusWithinChanged"></TextBox>
 
                         <!-- Clear Search -->
 

src/DynamoCoreWpf/Views/PackageManager/Controls/SearchBoxControl.xaml.cs

@@ -1,5 +1,3 @@
-using Dynamo.PackageManager;
-using HelixToolkit.Wpf.SharpDX;
 using System;
 using System.Globalization;
 using System.Windows;
@@ -16,28 +14,28 @@ namespace Dynamo.PackageManager.UI
     public partial class SearchBoxControl : UserControl
     {
         private DispatcherTimer delayTimer;
+        private string userSearchInput = ""; // Store user's input separately
+        private static int delayTime = 100;  // set delay for event 100ms
 
-        // set delay for event 500ms
-        private static int delayTime = 500;
         /// <summary>
         /// Constructor
         /// </summary>
         public SearchBoxControl()
         {
             InitializeComponent();
+
+            delayTimer = new DispatcherTimer();
+            delayTimer.Interval = TimeSpan.FromMilliseconds(delayTime);
+            delayTimer.Tick += DelayTimer_Tick;
         }
-        private static DispatcherTimer Debounce(DispatcherTimer dispatcher, TimeSpan interval, Action action)
+
+        private void DelayTimer_Tick(object sender, EventArgs e)
         {
-            dispatcher?.Stop();
-            dispatcher = null;
-            dispatcher = new DispatcherTimer(interval,  DispatcherPriority.ApplicationIdle, (s, e) =>
-            {
-                dispatcher?.Stop();
-                action.Invoke();
-            }, Dispatcher.CurrentDispatcher);
-            dispatcher?.Start();
-
-            return dispatcher;
+            delayTimer.Stop();
+            var textBox = this.SearchTextBox;
+            if (textBox == null) return;
+            (this.DataContext as PackageManagerSearchViewModel)?.SearchAndUpdateResults(userSearchInput);
+            textBox.Focus();
         }
 
         /// <summary>
@@ -48,15 +46,16 @@ private static DispatcherTimer Debounce(DispatcherTimer dispatcher, TimeSpan int
         /// <exception cref="NotImplementedException"></exception>
         private void SearchTextBox_OnTextChanged(object sender, TextChangedEventArgs e)
         {
+            var textBox = sender as TextBox;
+            if (textBox == null) return;
 
-            Debounce(delayTimer, TimeSpan.FromMilliseconds(delayTime), () =>
-            {
-                var textBox = sender as TextBox;
-                if (textBox == null) return;
-                (this.DataContext as PackageManagerSearchViewModel)?.SearchAndUpdateResults(textBox.Text);
-                textBox.Focus();
-            });
+            userSearchInput = textBox.Text;
+
+            // When text changes, restart the timer
+            delayTimer.Stop();
+            delayTimer.Start();
         }
+
         private void OnSearchClearButtonClicked(object sender, System.Windows.Input.MouseButtonEventArgs e)
         {
             this.SearchTextBox.Clear();
@@ -76,6 +75,11 @@ private void SearchTextBox_OnKeyboardFocusWithinChanged(object sender, Dependenc
                 SearchTextBoxWatermark.Visibility = Visibility.Collapsed;
             }
         }
+
+        internal void Dispose()
+        {
+            delayTimer.Tick -= DelayTimer_Tick;
+        }
     }
 
     /// <summary>
@@ -106,7 +110,7 @@ public object Convert(object[] values, Type targetType, object parameter, Cultur
                 else
                 {
                     if (value != null && string.IsNullOrWhiteSpace(value.ToString()))
-                    {
+                    {   
                         textVisible = true; // If the textbox has no text, we can show the Control..
                     }
                     else

src/DynamoCoreWpf/Views/PackageManager/PackageManagerView.xaml.cs

@@ -6,6 +6,7 @@
 using Dynamo.Controls;
 using Dynamo.Logging;
 using Dynamo.UI;
+using Dynamo.Utilities;
 using Dynamo.ViewModels;
 using Dynamo.Wpf.Utilities;
 using DynamoUtilities;
@@ -124,7 +125,13 @@ private void WindowClosed(object sender, EventArgs e)
         {
             this.packageManagerPublish.Dispose();
             this.PackageManagerViewModel.PackageSearchViewModel.RequestShowFileDialog -= OnRequestShowFileDialog;
-            this.PackageManagerViewModel.PackageSearchViewModel.Close();
+            this.PackageManagerViewModel.PackageSearchViewModel.PackageManagerViewClose();
+
+            var searchBoxes = this.ChildrenOfType<SearchBoxControl>();
+            foreach(var searchBox in searchBoxes)
+            {
+                searchBox.Dispose();
+            }
         }
 
         private void SearchForPackagesButton_Click(object sender, RoutedEventArgs e)

test/DynamoCoreWpfTests/PackageManager/PackageManagerUITests.cs

@@ -1614,6 +1614,33 @@ public void PackageManagerClosesWithDynamo()
             AssertWindowClosedWithDynamoView<PackageManagerView>();
         }
 
+        [Test]
+        public void SearchBoxInactiveOnWindowOpened()
+        {
+            ViewModel.OnRequestPackageManagerDialog(null, null);
+
+            var windows = GetWindowEnumerable(View.OwnedWindows);
+            var packageManagerView = windows.First(x => x is PackageManagerView) as PackageManagerView;
+
+            Assert.IsNotNull(packageManagerView);
+
+            var searchBox = LogicalTreeHelper.FindLogicalNode(packageManagerView, "SearchBox") as UserControl;
+            Assert.IsNotNull(searchBox);
+            Assert.IsFalse(searchBox.IsEnabled);
+
+            packageManagerView.PackageManagerViewModel.PackageSearchViewModel.InitialResultsLoaded = true;
+            Assert.IsTrue(searchBox.IsEnabled);
+        }
+
+        [Test]
+        public void PackageManagerDialogDoesNotThrowExceptions()
+        {
+            Assert.DoesNotThrow(() => ViewModel.OnRequestPackageManagerDialog(null, null), "Package Manager View did not open without exceptions");
+
+            AssertWindowOwnedByDynamoView<PackageManagerView>();
+        }
+
+
         /// <summary>
         ///     Asserts that the filter context menu will stay open while the user interacts with it
         /// </summary>