From 0106be30a2ce06025c40375252a8b2d91ec66ea2 Mon Sep 17 00:00:00 2001
From: chinboy <chinboy@qinware.com>
Date: Thu, 16 Jan 2025 15:05:10 +0800
Subject: [PATCH] Add InstancedBindingFactory

---
 .../Data/InstancedBindingFactory.cs           | 59 +++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 src/AtomUI.Base/Data/InstancedBindingFactory.cs

diff --git a/src/AtomUI.Base/Data/InstancedBindingFactory.cs b/src/AtomUI.Base/Data/InstancedBindingFactory.cs
new file mode 100644
index 000000000..92915185c
--- /dev/null
+++ b/src/AtomUI.Base/Data/InstancedBindingFactory.cs
@@ -0,0 +1,59 @@
+using System.Reactive.Linq;
+using Avalonia.Data;
+
+namespace AtomUI.Data;
+
+internal static class InstancedBindingFactory
+{
+    public static InstancedBinding CreateInstancedBinding(object source,
+                                                          BindingMode mode,
+                                                          BindingPriority priority = BindingPriority.LocalValue)
+    {
+        _ = source ?? throw new ArgumentNullException(nameof(source));
+        if (mode == BindingMode.OneTime)
+        {
+            if (source is IObservable<object?> observable)
+            {
+                return InstancedBinding.OneTime(observable, priority);
+            }
+            return InstancedBinding.OneTime(Observable.Return(source), priority);
+        } else if (mode == BindingMode.OneWay)
+        {
+            if (source is IObservable<object?> observable)
+            {
+                return InstancedBinding.OneWay(observable, priority);
+            }
+            else
+            {
+                throw new ArgumentException("source type must be IObservable<object?>.");
+            }
+        }
+        else if (mode == BindingMode.OneWayToSource)
+        {
+            if (source is IObserver<object?> observer)
+            {
+                return InstancedBinding.OneWayToSource(observer, priority);
+            } 
+            else
+            {
+                throw new ArgumentException("source type must be IObserver<object?>.");
+            }
+        }
+        else if (mode == BindingMode.TwoWay)
+        {
+            if (source is IObserver<object?> observer)
+            {
+                return InstancedBinding.OneWayToSource(observer, priority);
+            } 
+            else
+            {
+                throw new ArgumentException("source type must be IObserver<object?>.");
+            }
+        }
+        else
+        {
+            throw new ArgumentException("mode must be OneTime, OneWay or OneWayToSource.");
+        }
+    }
+    
+}
\ No newline at end of file