Paste Button Now Changes Enabled Property When Needed

Author: Luke Blevins

GenericFileBrowser.xaml

@@ -21,6 +21,7 @@
     xmlns:local="using:Files"
     xmlns:local1="using:Navigation"
     xmlns:local2="using:ItemListPresenter"
+    xmlns:local3="using:Interact"
     Name="GenericItemView"
     mc:Ignorable="d" ScrollViewer.HorizontalScrollBarVisibility="Hidden" ScrollViewer.VerticalScrollBarVisibility="Auto">
 
@@ -160,7 +161,7 @@
                             <TextBlock TextWrapping="WrapWholeWords" VerticalAlignment="Bottom"  Text="Add Item" HorizontalAlignment="Center" TextAlignment="Center" Width="60"/>
                         </StackPanel>
                         <StackPanel Orientation="Vertical" Margin="2">
-                            <AppBarButton HorizontalAlignment="Center" x:Name="Paste" Style="{ThemeResource AppBarButtonRevealStyle}"  Content="&#xE77F;" FontFamily="Segoe MDL2 Assets" FontSize="20" VerticalAlignment="Center" Width="50" Height="50" />
+                            <AppBarButton IsEnabled="{x:Bind local3:Interaction.PS.isEnabled, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" HorizontalAlignment="Center" x:Name="Paste" Style="{ThemeResource AppBarButtonRevealStyle}"  Content="&#xE77F;" FontFamily="Segoe MDL2 Assets" FontSize="20" VerticalAlignment="Center" Width="50" Height="50" />
                             <TextBlock TextWrapping="WrapWholeWords" VerticalAlignment="Bottom"  Text="Paste" HorizontalAlignment="Center" TextAlignment="Center" Width="60"/>
                         </StackPanel>
                         <StackPanel Orientation="Vertical" Margin="2">

GenericFileBrowser.xaml.cs

@@ -69,10 +69,22 @@ public GenericFileBrowser()
             Refresh.Click += Navigation.NavigationActions.Refresh_Click;
             AllView.DoubleTapped += Interact.Interaction.List_ItemClick;
             Paste.Click += Interact.Interaction.PasteItem_ClickAsync;
+            Clipboard.ContentChanged += Clipboard_ContentChanged;
 
         }
 
-        
+        private void Clipboard_ContentChanged(object sender, object e)
+        {
+            DataPackageView packageView = Clipboard.GetContent();
+            if (packageView.Contains(StandardDataFormats.StorageItems))
+            {
+                Interact.Interaction.PS.isEnabled = true;
+            }
+            else
+            {
+                Interact.Interaction.PS.isEnabled = false;
+            }
+        }
 
         public static UniversalPath p = new UniversalPath();
         public static UniversalPath P { get { return GenericFileBrowser.p; } }

ItemInteractions.cs

@@ -29,6 +29,7 @@
 using Windows.UI.Xaml.Media;
 using System.Collections.ObjectModel;
 using Windows.UI.Xaml.Media.Animation;
+using System.ComponentModel;
 
 namespace Interact
 {
@@ -37,8 +38,9 @@ namespace Interact
 
     public class Interaction
     {
-        
 
+        private static PasteState ps = new PasteState();
+        public static PasteState PS { get { return ps; } }
 
         public static Page page;
         public Interaction(Page p)
@@ -452,5 +454,31 @@ private static async void CloneDirectoryAsync(string SourcePath, string Destinat
         }
     }
 
+    public class PasteState : INotifyPropertyChanged
+    {
+        public bool _isEnabled;
+        public bool isEnabled
+        {
+            get
+            {
+                return _isEnabled;
+            }
+
+            set
+            {
+                if (value != _isEnabled)
+                {
+                    _isEnabled = value;
+                    NotifyPropertyChanged("isEnabled");
+                }
+            }
+        }
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        private void NotifyPropertyChanged(string info)
+        {
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(info));
+        }
+    }
 
 }

NavigationSystem.cs

@@ -113,7 +113,6 @@ public bool isEnabled
                 {
                     _isEnabled = value;
                     NotifyPropertyChanged("isEnabled");
-                    Debug.WriteLine("NotifyPropertyChanged was called successfully");
                 }
             }
         }
@@ -144,7 +143,6 @@ public bool isEnabled
                 {
                     _isEnabled = value;
                     NotifyPropertyChanged("isEnabled");
-                    Debug.WriteLine("NotifyPropertyChanged was called successfully");
                 }
             }
         }