[WPF] Add ListView with SelectedIndexes

Xwt.WPF/Xwt.WPF.csproj

@@ -63,6 +63,7 @@
     <Compile Include="Xwt.WPFBackend\ContextBackendHandler.cs" />
     <Compile Include="Xwt.WPFBackend\DropDownButton.cs" />
     <Compile Include="Xwt.WPFBackend\ExCanvas.cs" />
+    <Compile Include="Xwt.WPFBackend\ExListView.cs" />
     <Compile Include="Xwt.WPFBackend\FileDialogBackend.cs" />
     <Compile Include="Xwt.WPFBackend\FrameBackend.cs" />
     <Compile Include="Xwt.WPFBackend\GradientBackendHandler.cs" />

Xwt.WPF/Xwt.WPFBackend/ExListView.cs

@@ -0,0 +1,149 @@
+//
+// ExListView.cs
+//
+// Author:
+//       Eric Maupin <ermau@xamarin.com>
+//
+// Copyright (c) 2012 Xamarin, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Collections.Specialized;
+using System.ComponentModel;
+using System.Linq;
+using System.Text;
+using System.Windows;
+using System.Windows.Controls;
+using SWC = System.Windows.Controls;
+
+namespace Xwt.WPFBackend
+{
+	public class ExListView
+		: SWC.ListView
+	{
+		public ExListView()
+		{
+			SelectedIndexes = new ObservableCollection<int> ();
+		}
+
+		public static readonly DependencyProperty SelectedIndexesProperty = DependencyProperty.Register (
+			"SelectedIndexes",
+			typeof (ICollection<int>), typeof (ExListView),
+			new UIPropertyMetadata (OnSelectedIndexesPropertyChanged));
+
+		public ICollection<int> SelectedIndexes
+		{
+			get
+			{
+				if (SelectionMode == SWC.SelectionMode.Single)
+					throw new InvalidOperationException();
+
+				return (ICollection<int>) GetValue (SelectedIndexesProperty);
+			}
+
+			set { SetValue (SelectedIndexesProperty, value); }
+		}
+
+		protected override void OnSelectionChanged (SelectionChangedEventArgs e)
+		{
+			if (this.changingSelection) {
+				base.OnSelectionChanged (e);
+				return;
+			}
+
+			this.changingSelection = true;
+			if (e.AddedItems != null) {
+				foreach (object item in e.AddedItems) {
+					SelectedIndexes.Add (Items.IndexOf (item));
+				}
+			}
+
+			if (e.RemovedItems != null) {
+				foreach (object item in e.RemovedItems) {
+					SelectedIndexes.Remove (Items.IndexOf (item));
+				}
+			}
+
+			this.changingSelection = false;
+		}
+
+		protected virtual void OnSelectedIndexesChanged (DependencyPropertyChangedEventArgs e)
+		{
+			var oldNotifying = e.OldValue as INotifyCollectionChanged;
+			if (oldNotifying != null)
+				oldNotifying.CollectionChanged -= SelectedIndexesChanged;
+
+			if (SelectionMode == SWC.SelectionMode.Single)
+				throw new InvalidOperationException();
+
+			var newNotifying = e.NewValue as INotifyCollectionChanged;
+			if (newNotifying != null)
+				newNotifying.CollectionChanged += SelectedIndexesChanged;
+		}
+
+		private bool changingSelection;
+		private void SelectedIndexesChanged (object sender, NotifyCollectionChangedEventArgs e)
+		{
+			if (this.changingSelection)
+				return;
+
+			this.changingSelection = true;
+
+			if (SelectionMode == SWC.SelectionMode.Single) {
+				SelectedItem = null;
+				if (e.NewItems != null && e.NewItems.Count > 0)
+					SelectedItem = Items [(int) e.NewItems [0]];
+
+				this.changingSelection = false;
+				return;
+			}
+
+			if (e.Action == NotifyCollectionChangedAction.Reset) {
+				SelectedItems.Clear();
+				foreach (int index in SelectedIndexes)
+				{
+					SelectedItems.Add (Items[index]);
+					if (SelectionMode == SWC.SelectionMode.Single)
+						break;
+				}
+			} else {
+				if (e.NewItems != null) {
+					foreach (int index in e.NewItems)
+						SelectedItems.Add (Items[index]);
+				}
+
+				if (e.OldItems != null) {
+					foreach (int index in e.OldItems)
+						SelectedItems.Remove (Items [index]);
+				}
+			}
+
+			this.changingSelection = false;
+		}
+
+		private static void OnSelectedIndexesPropertyChanged (DependencyObject dobj, DependencyPropertyChangedEventArgs e)
+		{
+			var view = (ExListView) dobj;
+			view.OnSelectedIndexesChanged (e);
+		}
+	}
+}