Work on document manager

RainmeterEditor/Business/DocumentManager.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using RainmeterEditor.Model;
+using RainmeterEditor.Model.Events;
+
+namespace RainmeterEditor.Business
+{
+    public class DocumentManager
+    {
+        #region Singleton instance
+        private static DocumentManager _instance = null;
+
+        /// <summary>
+        /// Gets the instance of DocumentManager
+        /// </summary>
+        public static DocumentManager Instance
+        {
+            get
+            {
+                if (_instance == null)
+                    _instance = new DocumentManager();
+
+                return _instance;
+            }
+        }
+
+        #endregion
+
+        private DocumentManager()
+        {
+        }
+
+        List<IDocumentEditorFactory> _factories = new List<IDocumentEditorFactory>();
+        List<IDocumentEditor> _editors = new List<IDocumentEditor>();
+
+        public event EventHandler<DocumentOpenedEventArgs> DocumentOpened;
+
+        /// <summary>
+        /// Registers a document editor factory
+        /// </summary>
+        /// <param name="factory">Document editor factory</param>
+        public void RegisterEditorFactory(IDocumentEditorFactory factory)
+        {
+            _factories.Add(factory);
+        }
+
+        /// <summary>
+        /// Creates a new document in the specified path, with the specified format, and opens it
+        /// </summary>
+        /// <param name="format"></param>
+        /// <param name="path"></param>
+        public void Create(DocumentFormat format, string path)
+        {
+            // Create document
+            var document = format.Factory.CreateDocument(format, path);
+
+            // Create editor
+            var editor = format.Factory.CreateEditor(document);
+            _editors.Add(editor);
+
+            // Trigger event
+            if (DocumentOpened != null)
+                DocumentOpened(this, new DocumentOpenedEventArgs(editor));
+        }
+
+        public IEnumerable<DocumentFormat> DocumentFormats
+        {
+            get
+            {
+                foreach (var f in _factories)
+                    foreach (var df in f.CreateDocumentFormats)
+                        yield return df;
+            }
+        }
+    }
+}