Entry page is now a Hub

EntryDetailVM and GroupDetailVM are now singleton
Read-only Additional fields and Attachments

WinAppCommon/Common/ObservableDictionary.cs

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+using System.Collections.Generic;
+using System.Linq;
+using Windows.Foundation.Collections;
+
+namespace ModernKeePass.Common
+{
+    /// <summary>
+    /// Implementation of IObservableMap that supports reentrancy for use as a default view
+    /// model.
+    /// </summary>
+    public class ObservableDictionary : IObservableMap<string, object>
+    {
+        private class ObservableDictionaryChangedEventArgs : IMapChangedEventArgs<string>
+        {
+            public ObservableDictionaryChangedEventArgs(CollectionChange change, string key)
+            {
+                CollectionChange = change;
+                Key = key;
+            }
+
+            public CollectionChange CollectionChange { get; }
+            public string Key { get; }
+        }
+
+        private readonly Dictionary<string, object> _dictionary = new Dictionary<string, object>();
+        public event MapChangedEventHandler<string, object> MapChanged;
+
+        private void InvokeMapChanged(CollectionChange change, string key)
+        {
+            MapChanged?.Invoke(this, new ObservableDictionaryChangedEventArgs(change, key));
+        }
+
+        public void Add(string key, object value)
+        {
+            _dictionary.Add(key, value);
+            InvokeMapChanged(CollectionChange.ItemInserted, key);
+        }
+
+        public void Add(KeyValuePair<string, object> item)
+        {
+            Add(item.Key, item.Value);
+        }
+
+        public void AddRange(IEnumerable<KeyValuePair<string, object>> values)
+        {
+            foreach (var value in values)
+            {
+                Add(value);
+            }
+        }
+
+        public bool Remove(string key)
+        {
+            if (_dictionary.Remove(key))
+            {
+                InvokeMapChanged(CollectionChange.ItemRemoved, key);
+                return true;
+            }
+            return false;
+        }
+
+        public bool Remove(KeyValuePair<string, object> item)
+        {
+            object currentValue;
+            if (_dictionary.TryGetValue(item.Key, out currentValue) &&
+                Equals(item.Value, currentValue) && _dictionary.Remove(item.Key))
+            {
+                InvokeMapChanged(CollectionChange.ItemRemoved, item.Key);
+                return true;
+            }
+            return false;
+        }
+
+        public object this[string key]
+        {
+            get
+            {
+                return _dictionary[key];
+            }
+            set
+            {
+                _dictionary[key] = value;
+                InvokeMapChanged(CollectionChange.ItemChanged, key);
+            }
+        }
+
+        public void Clear()
+        {
+            var priorKeys = _dictionary.Keys.ToArray();
+            _dictionary.Clear();
+            foreach (var key in priorKeys)
+            {
+                InvokeMapChanged(CollectionChange.ItemRemoved, key);
+            }
+        }
+
+        public ICollection<string> Keys => _dictionary.Keys;
+
+        public bool ContainsKey(string key)
+        {
+            return _dictionary.ContainsKey(key);
+        }
+
+        public bool TryGetValue(string key, out object value)
+        {
+            return _dictionary.TryGetValue(key, out value);
+        }
+
+        public ICollection<object> Values => _dictionary.Values;
+
+        public bool Contains(KeyValuePair<string, object> item)
+        {
+            return _dictionary.Contains(item);
+        }
+
+        public int Count => _dictionary.Count;
+
+        public bool IsReadOnly => false;
+
+        public IEnumerator<KeyValuePair<string, object>> GetEnumerator()
+        {
+            return _dictionary.GetEnumerator();
+        }
+
+        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
+        {
+            return _dictionary.GetEnumerator();
+        }
+
+        public void CopyTo(KeyValuePair<string, object>[] array, int arrayIndex)
+        {
+            var arraySize = array.Length;
+            foreach (var pair in _dictionary)
+            {
+                if (arrayIndex >= arraySize) break;
+                array[arrayIndex++] = pair;
+            }
+        }
+    }
+}