bind observable collection on labelListView

FileManager_UWP/Controls/LabelListControl.cs

@@ -1,5 +1,7 @@
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Diagnostics;
 using System.Linq;
 using System.Runtime.InteropServices.WindowsRuntime;
 using Windows.UI.Xaml;
@@ -7,18 +9,60 @@ using Windows.UI.Xaml.Controls;
 using Windows.UI.Xaml.Data;
 using Windows.UI.Xaml.Documents;
 using Windows.UI.Xaml.Input;
+using Windows.UI.Xaml.Markup;
 using Windows.UI.Xaml.Media;
 
 // The Templated Control item template is documented at https://go.microsoft.com/fwlink/?LinkId=234235
 
 namespace FileManager_UWP.Controls {
-    public sealed class LabelListControl: Control {
+
+    public class LabelListControl: ItemsControl {
         public LabelListControl() {
             this.DefaultStyleKey = typeof(LabelListControl);
+            //var itemSource = new ObservableCollection<string>();
+            //itemSource.CollectionChanged += ItemsSource_CollectionChanged;
+            //ItemsSource = itemSource;
+            //Debug.WriteLine(itemSource.ToString());
+        }
+
+        private void ItemsSource_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e) {
+            Debug.WriteLine("Add ELEMENT");
+            OnApplyTemplate();
+        }
+
+        public new ObservableCollection<string> ItemsSource {
+            get { return (ObservableCollection<string>)GetValue(ItemsControl.ItemsSourceProperty); }
+            set { SetValue(ItemsControl.ItemsSourceProperty, value); }
+        }
+
+        public new static readonly DependencyProperty ItemsSourceProperty =
+             DependencyProperty.Register(
+                 "ItemsSource", typeof(ObservableCollection<string>), typeof(LabelListControl),
+                 new PropertyMetadata(null, OnItemsChanged));
+
+        private static void OnItemsChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args) {
+            Debug.WriteLine("Add Element.");
+            LabelListControl target = obj as LabelListControl;
+            ObservableCollection<string> oldValue = (ObservableCollection<string>)args.OldValue;
+            ObservableCollection<string> newValue = (ObservableCollection<string>)args.NewValue;
+            if (oldValue != newValue) {
+                target.ItemsSource = newValue;
+                target.OnApplyTemplate();
+            }
         }
 
         protected override void OnApplyTemplate() {
-            ((TextBlock)GetTemplateChild("LabelTextBlock")).Text = "测试自定义控件";
+            TextBlock textBlock = (TextBlock)GetTemplateChild("LabelTextBlock");
+            textBlock.Text = "测试自定义控件\n";
+            ListView listView = (ListView)GetTemplateChild("LabelListView");
+            //listView.ItemsSource = ItemsSource;
+            ItemsSource.CollectionChanged += ItemsSource_CollectionChanged;
+            Debug.WriteLine(ItemsSource.ToString());
+            if (ItemsSource != null) {
+                textBlock.Text += (ItemsSource as ICollection<string>).Count().ToString();
+            } else {
+                textBlock.Text += "0";
+            }
         }
     }
 }