项目结构调整

Others/Live-Charts-master/UwpView/Components/MultiBinding/MultiBindingItemCollection.cs

@@ -0,0 +1,115 @@
+using System.Collections.Specialized;
+using System.Linq;
+using Windows.UI.Xaml;
+
+namespace LiveCharts.Uwp.Components.MultiBinding
+{
+    /// <summary>
+    /// Represents a collection of <see cref="MultiBindingBehavior" />.
+    /// </summary>
+    public class MultiBindingItemCollection : DependencyObjectCollection<MultiBindingItem>
+    {
+        private bool _updating;
+
+        /// <summary>
+        /// Gets or sets the multiple binding value.
+        /// </summary>
+        /// <value>The multiple binding value.</value>
+        public object[] Value
+        {
+            get { return (object[])GetValue(ValueProperty); }
+            set { SetValue(ValueProperty, value); }
+        }
+
+        /// <summary>
+        /// Identifier for the <see cref="Value" /> dependency property.
+        /// </summary>
+        internal static readonly DependencyProperty ValueProperty =
+            DependencyProperty.Register(nameof(Value), typeof(object[]), typeof(MultiBindingItemCollection), new PropertyMetadata(null, OnValueChanged));
+
+        private static void OnValueChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+        {
+            var multiBindingItemCollection = (MultiBindingItemCollection)d;
+
+            multiBindingItemCollection.UpdateSource();
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="MultiBindingItemCollection"/> class.
+        /// </summary>
+        public MultiBindingItemCollection()
+        {
+            CollectionChanged += OnCollectionChanged;
+        }
+
+        private void OnCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
+        {
+            if (e.OldItems != null)
+            {
+                foreach (MultiBindingItem item in e.OldItems)
+                {
+                    item.Parent = null;
+                }
+            }
+
+            if (e.NewItems != null)
+            {
+                foreach (MultiBindingItem item in e.NewItems)
+                {
+                    item.Parent = this;
+                }
+            }
+
+            Update();
+        }
+
+        internal void Update()
+        {
+            if (_updating)
+            {
+                return;
+            }
+
+            try
+            {
+                _updating = true;
+
+                Value = this
+                    .OfType<MultiBindingItem>()
+                    .Select(x => x.Value)
+                    .ToArray();
+            }
+            finally
+            {
+                _updating = false;
+            }
+        }
+
+        private void UpdateSource()
+        {
+            if (_updating)
+            {
+                return;
+            }
+
+            try
+            {
+                _updating = true;
+
+                for (var index = 0; index < this.Count; index++)
+                {
+                    var multiBindingItem = this[index] as MultiBindingItem;
+
+                    if (multiBindingItem != null)
+                    {
+                        multiBindingItem.Value = Value[index];
+                    }
+                }
+            }
+            finally
+            {
+                _updating = false;
+            }
+        }
+    }
+}