Copy/Paste images internally for Android (#257)

Author: Mateusz-Nejman

Pixed.Android.Shared/AndroidDependencyRegister.cs

@@ -1,12 +1,14 @@
 using Microsoft.Extensions.DependencyInjection;
 using Pixed.Application.Platform;
 using Pixed.Common.DependencyInjection;
+using Pixed.Common.Platform;
 
 namespace Pixed.Android;
 internal class AndroidDependencyRegister : IDependencyRegister
 {
     public void Register(ref IServiceCollection collection)
     {
         collection.AddSingleton<IPlatformFolder, PlatformFolder>();
+        collection.AddSingleton<IClipboardHandle, PlatformClipboard>();
     }
 }

Pixed.Android.Shared/PlatformClipboard.cs

@@ -0,0 +1,45 @@
+using Avalonia.Input;
+using Avalonia.Input.Platform;
+using Pixed.Common.Platform;
+
+namespace Pixed.Android;
+internal class PlatformClipboard : IClipboardHandle
+{
+    private byte[]? _copiedBuffer;
+    public Task ClearAsync()
+    {
+        _copiedBuffer = null;
+        return Task.CompletedTask;
+    }
+
+    public Task<object?> GetDataAsync(string format)
+    {
+        if(format != "PNG" || _copiedBuffer == null)
+        {
+            return Task.FromResult<object?>(null);
+        }
+
+        return Task.FromResult<object?>(_copiedBuffer);
+    }
+
+    public Task<string[]> GetFormatsAsync()
+    {
+        return Task.FromResult<string[]>(_copiedBuffer == null ? [] : ["PNG"]);
+    }
+
+    public void Initialize(IClipboard clipboard)
+    {
+    }
+
+    public Task SetDataObjectAsync(IDataObject data)
+    {
+        var png = data.Get("PNG");
+
+        if(png != null && png is byte[] array)
+        {
+            _copiedBuffer = array;
+        }
+
+        return Task.CompletedTask;
+    }
+}