feature: support to use input control in custom action

Signed-off-by: leo <longshuang@msn.cn>

src/ViewModels/ConfigureCustomActionControls.cs

@@ -0,0 +1,62 @@
+using Avalonia.Collections;
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace SourceGit.ViewModels
+{
+    public class ConfigureCustomActionControls : ObservableObject
+    {
+        public AvaloniaList<Models.CustomActionControl> Controls
+        {
+            get;
+        }
+
+        public Models.CustomActionControl Edit
+        {
+            get => _edit;
+            set => SetProperty(ref _edit, value);
+        }
+
+        public ConfigureCustomActionControls(AvaloniaList<Models.CustomActionControl> controls)
+        {
+            Controls = controls;
+        }
+
+        public void Add()
+        {
+            var added = new Models.CustomActionControl() { Type = Models.CustomActionControlType.TextBox };
+            Controls.Add(added);
+            Edit = added;
+        }
+
+        public void Remove()
+        {
+            if (_edit == null)
+                return;
+
+            Controls.Remove(_edit);
+            Edit = null;
+        }
+
+        public void MoveUp()
+        {
+            if (_edit == null)
+                return;
+
+            var idx = Controls.IndexOf(_edit);
+            if (idx > 0)
+                Controls.Move(idx - 1, idx);
+        }
+
+        public void MoveDown()
+        {
+            if (_edit == null)
+                return;
+
+            var idx = Controls.IndexOf(_edit);
+            if (idx < Controls.Count - 1)
+                Controls.Move(idx + 1, idx);
+        }
+
+        private Models.CustomActionControl _edit;
+    }
+}