From 65bd5f4e8a6a534f7aab8fd265b5d02855fdbb15 Mon Sep 17 00:00:00 2001
From: Joshua Askharoun <jjask7@gmail.com>
Date: Tue, 22 Feb 2022 14:32:20 -0600
Subject: [PATCH] Added entrance animation to home page

---
 .../Behaviors/FadeAnimateItemsBehavior.cs     | 75 +++++++++++++++++++
 ZuneModdingHelper/MainWindow.xaml             | 10 +++
 ZuneModdingHelper/MainWindow.xaml.cs          |  7 +-
 3 files changed, 89 insertions(+), 3 deletions(-)
 create mode 100644 ZuneModdingHelper/Behaviors/FadeAnimateItemsBehavior.cs

diff --git a/ZuneModdingHelper/Behaviors/FadeAnimateItemsBehavior.cs b/ZuneModdingHelper/Behaviors/FadeAnimateItemsBehavior.cs
new file mode 100644
index 0000000..6163ba5
--- /dev/null
+++ b/ZuneModdingHelper/Behaviors/FadeAnimateItemsBehavior.cs
@@ -0,0 +1,75 @@
+using Microsoft.Xaml.Behaviors;
+using System;
+using System.Collections.Generic;
+using System.Collections.Specialized;
+using System.Linq;
+using System.Windows.Controls;
+using System.Windows.Media.Animation;
+using System.Windows.Threading;
+
+namespace ZuneModdingHelper.Behaviors
+{
+    // https://stackoverflow.com/a/5910833
+    public class FadeAnimateItemsBehavior : Behavior<ListBox>
+    {
+        public DoubleAnimation Animation { get; set; }
+        public TimeSpan Tick { get; set; }
+
+        protected override void OnAttached()
+        {
+            base.OnAttached();
+            AssociatedObject.Loaded += AssociatedObject_Loaded;
+        }
+
+        void AssociatedObject_Loaded(object sender, System.Windows.RoutedEventArgs e)
+        {
+            IEnumerable<ListBoxItem> items;
+            if (AssociatedObject.ItemsSource == null)
+            {
+                items = AssociatedObject.Items.Cast<ListBoxItem>();
+            }
+            else
+            {
+                var itemsSource = AssociatedObject.ItemsSource;
+                if (itemsSource is INotifyCollectionChanged)
+                {
+                    var collection = itemsSource as INotifyCollectionChanged;
+                    collection.CollectionChanged += (s, cce) =>
+                    {
+                        if (cce.Action == NotifyCollectionChangedAction.Add)
+                        {
+                            var itemContainer = AssociatedObject.ItemContainerGenerator.ContainerFromItem(cce.NewItems[0]) as ListBoxItem;
+                            itemContainer.BeginAnimation(ListBoxItem.OpacityProperty, Animation);
+                        }
+                    };
+
+                }
+                ListBoxItem[] itemsSub = new ListBoxItem[AssociatedObject.Items.Count];
+                for (int i = 0; i < itemsSub.Length; i++)
+                {
+                    itemsSub[i] = AssociatedObject.ItemContainerGenerator.ContainerFromIndex(i) as ListBoxItem;
+                }
+                items = itemsSub;
+            }
+            foreach (var item in items)
+            {
+                item.Opacity = 0;
+            }
+            var enumerator = items.GetEnumerator();
+            if (enumerator.MoveNext())
+            {
+                DispatcherTimer timer = new() { Interval = Tick };
+                timer.Tick += (s, timerE) =>
+                {
+                    var item = enumerator.Current;
+                    item.BeginAnimation(ListBoxItem.OpacityProperty, Animation);
+                    if (!enumerator.MoveNext())
+                    {
+                        timer.Stop();
+                    }
+                };
+                timer.Start();
+            }
+        }
+    }
+}
diff --git a/ZuneModdingHelper/MainWindow.xaml b/ZuneModdingHelper/MainWindow.xaml
index 7b08b9b..b9c24f0 100644
--- a/ZuneModdingHelper/MainWindow.xaml
+++ b/ZuneModdingHelper/MainWindow.xaml
@@ -6,6 +6,8 @@
                  xmlns:local="clr-namespace:ZuneModdingHelper"
                  xmlns:core="clr-namespace:ZuneModCore;assembly=ZuneModCore"
                  xmlns:mah="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
+                 xmlns:i="http://schemas.microsoft.com/xaml/behaviors"
+                 xmlns:b="clr-namespace:ZuneModdingHelper.Behaviors"
                  mc:Ignorable="d"
                  Title="{x:Static local:App.Title}" Height="450" Width="800" WindowStartupLocation="CenterScreen"
                  Loaded="Window_Loaded">
@@ -131,6 +133,14 @@
                     </Border>
                 </DataTemplate>
             </ListView.ItemTemplate>
+
+            <i:Interaction.Behaviors>
+                <b:FadeAnimateItemsBehavior Tick="0:0:0.05">
+                    <b:FadeAnimateItemsBehavior.Animation>
+                        <DoubleAnimation From="0" To="1" Duration="0:0:0.3"/>
+                    </b:FadeAnimateItemsBehavior.Animation>
+                </b:FadeAnimateItemsBehavior>
+            </i:Interaction.Behaviors>
         </ListView>
 
         <Border Grid.Row="1" BorderThickness="0,1,0,0" BorderBrush="{StaticResource MahApps.Brushes.Control.Border}">
diff --git a/ZuneModdingHelper/MainWindow.xaml.cs b/ZuneModdingHelper/MainWindow.xaml.cs
index ddfaea3..800b929 100644
--- a/ZuneModdingHelper/MainWindow.xaml.cs
+++ b/ZuneModdingHelper/MainWindow.xaml.cs
@@ -34,20 +34,21 @@ namespace ZuneModdingHelper
         public MainWindow()
         {
             InitializeComponent();
+            // https://github.com/Arlodotexe/OwlCore/issues/1
             OwlCore.Threading.SetPrimarySynchronizationContext(System.Threading.SynchronizationContext.Current!);
             OwlCore.Threading.SetPrimaryThreadInvokeHandler(RunOnUI);
 
             ThemeManager.Current.ThemeSyncMode = ThemeSyncMode.SyncWithAppMode;
             ThemeManager.Current.SyncTheme();
+
+            ModList.ItemsSource = Mod.AvailableMods;
+            ZuneInstallDirBox.Text = Mod.ZuneInstallDir;
         }
 
         private async System.Threading.Tasks.Task RunOnUI(Action action) => await Dispatcher.BeginInvoke(action);
 
         private async void Window_Loaded(object sender, RoutedEventArgs e)
         {
-            ModList.ItemsSource = Mod.AvailableMods;
-            ZuneInstallDirBox.Text = Mod.ZuneInstallDir;
-
             // Show a warning if Zune is running
             Process[] procs = Process.GetProcessesByName("Zune");
             string zuneExePath = Path.Combine(Mod.ZuneInstallDir, "Zune.exe");