Added ContextMenu/Flyout animations. Added platform services. Use bitmap cache for all views.

Harmonia.UI/Platform/ClipboardLocator.cs

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+using Avalonia.Controls;
+using Avalonia.Input.Platform;
+
+namespace Harmonia.UI.Platform;
+
+public class ClipboardLocator : PlatformServiceLocator<IClipboard>, IClipboardLocator
+{
+    protected override IClipboard? GetFromWindow(Window mainWindow)
+    {
+        return mainWindow.Clipboard;
+    }
+
+    protected override IClipboard? GetFromTopLevel(TopLevel topLevel)
+    {
+        return topLevel.Clipboard;
+    }
+}

Harmonia.UI/Platform/IClipboardLocator.cs

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+using Avalonia.Input.Platform;
+
+namespace Harmonia.UI.Platform;
+
+public interface IClipboardLocator : IPlatformServiceLocator<IClipboard>
+{
+
+}

Harmonia.UI/Platform/IPlatformServiceLocator.cs

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+namespace Harmonia.UI.Platform;
+
+public interface IPlatformServiceLocator<T>
+{
+    T? Get();
+}

Harmonia.UI/Platform/IStorageProviderLocator.cs

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+using Avalonia.Platform.Storage;
+
+namespace Harmonia.UI.Platform;
+
+public interface IStorageProviderLocator : IPlatformServiceLocator<IStorageProvider>
+{
+
+}

Harmonia.UI/Platform/PlatformServiceLocator.cs

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+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Controls;
+using Avalonia.Rendering;
+using Avalonia;
+using Avalonia.VisualTree;
+
+namespace Harmonia.UI.Platform;
+
+public abstract class PlatformServiceLocator<T> : IPlatformServiceLocator<T>
+{
+    public T? Get()
+    {
+        //Desktop
+        if (Application.Current?.ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            if (desktop.MainWindow == null)
+                return default;
+
+            return GetFromWindow(desktop.MainWindow);
+        }
+        //Android (and iOS?)
+        else if (Application.Current?.ApplicationLifetime is ISingleViewApplicationLifetime singleViewPlatform)
+        {
+            if (singleViewPlatform.MainView == null)
+                return default;
+
+            IRenderRoot? visualRoot = singleViewPlatform.MainView.GetVisualRoot();
+
+            if (visualRoot is TopLevel topLevel)
+            {
+                return GetFromTopLevel(topLevel);
+            }
+        }
+
+        return default;
+    }
+
+    protected abstract T? GetFromWindow(Window mainWindow);
+    protected abstract T? GetFromTopLevel(TopLevel topLevel);
+}

Harmonia.UI/Platform/StorageProviderLocator.cs

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+using Avalonia.Controls;
+using Avalonia.Platform.Storage;
+
+namespace Harmonia.UI.Platform;
+
+public class StorageProviderLocator : PlatformServiceLocator<IStorageProvider>, IStorageProviderLocator
+{
+    protected override IStorageProvider? GetFromWindow(Window mainWindow)
+    {
+        return mainWindow.StorageProvider;
+    }
+
+    protected override IStorageProvider? GetFromTopLevel(TopLevel topLevel)
+    {
+        return topLevel.StorageProvider;
+    }
+}