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164 changes: 164 additions & 0 deletions
164
ChartView/SL/BindingSelectedItemsToViewModel/GridUtilities.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,164 @@ | ||
| using System; | ||
| using System.Collections; | ||
| using System.Collections.Generic; | ||
| using System.Collections.Specialized; | ||
| using System.Windows; | ||
| using Telerik.Windows.Controls; | ||
|
|
||
| namespace BindingSelectedItemsToViewModel | ||
| { | ||
| public static class GridUtilities | ||
| { | ||
| public static readonly DependencyProperty SelectedItemsProperty = DependencyProperty.RegisterAttached( | ||
| "SelectedItems", | ||
| typeof(INotifyCollectionChanged), | ||
| typeof(GridUtilities), | ||
| new PropertyMetadata(null, OnSelectedItemsChanged)); | ||
|
|
||
| private static bool isSyncingSelection; | ||
| private static List<Tuple<WeakReference, List<RadGridView>>> collectionToGridViews = new List<Tuple<WeakReference, List<RadGridView>>>(); | ||
|
|
||
| public static INotifyCollectionChanged GetSelectedItems(DependencyObject obj) | ||
| { | ||
| return (INotifyCollectionChanged)obj.GetValue(SelectedItemsProperty); | ||
| } | ||
|
|
||
| public static void SetSelectedItems(DependencyObject obj, INotifyCollectionChanged value) | ||
| { | ||
| obj.SetValue(SelectedItemsProperty, value); | ||
| } | ||
|
|
||
| private static void OnSelectedItemsChanged(DependencyObject target, DependencyPropertyChangedEventArgs args) | ||
| { | ||
| var gridView = (RadGridView)target; | ||
|
|
||
| var oldCollection = args.OldValue as INotifyCollectionChanged; | ||
| if (oldCollection != null) | ||
| { | ||
| gridView.SelectionChanged -= GridView_SelectionChanged; | ||
| oldCollection.CollectionChanged -= SelectedItems_CollectionChanged; | ||
| RemoveAssociation(oldCollection, gridView); | ||
| } | ||
|
|
||
| var newCollection = args.NewValue as INotifyCollectionChanged; | ||
| if (newCollection != null) | ||
| { | ||
| gridView.SelectionChanged += GridView_SelectionChanged; | ||
| newCollection.CollectionChanged += SelectedItems_CollectionChanged; | ||
| AddAssociation(newCollection, gridView); | ||
| OnSelectedItemsChanged(newCollection, null, (IList)newCollection); | ||
| } | ||
| } | ||
|
|
||
| private static void SelectedItems_CollectionChanged(object sender, NotifyCollectionChangedEventArgs args) | ||
| { | ||
| INotifyCollectionChanged collection = (INotifyCollectionChanged)sender; | ||
| OnSelectedItemsChanged(collection, args.OldItems, args.NewItems); | ||
| } | ||
|
|
||
| private static void OnSelectedItemsChanged(INotifyCollectionChanged collection, IList oldItems, IList newItems) | ||
| { | ||
| isSyncingSelection = true; | ||
|
|
||
| var gridViews = GetOrCreateGridViews(collection); | ||
| foreach (var gridView in gridViews) | ||
| { | ||
| SyncSelection(gridView, oldItems, newItems); | ||
| } | ||
|
|
||
| isSyncingSelection = false; | ||
| } | ||
|
|
||
| private static void GridView_SelectionChanged(object sender, SelectionChangeEventArgs args) | ||
| { | ||
| if (isSyncingSelection) | ||
| { | ||
| return; | ||
| } | ||
|
|
||
| var collection = (IList)GetSelectedItems((RadGridView)sender); | ||
| foreach (object item in args.RemovedItems) | ||
| { | ||
| collection.Remove(item); | ||
| } | ||
| foreach (object item in args.AddedItems) | ||
| { | ||
| collection.Add(item); | ||
| } | ||
| } | ||
|
|
||
| private static void SyncSelection(RadGridView gridView, IList oldItems, IList newItems) | ||
| { | ||
| if (oldItems != null) | ||
| { | ||
| SetItemsSelection(gridView, oldItems, false); | ||
| } | ||
|
|
||
| if (newItems != null) | ||
| { | ||
| SetItemsSelection(gridView, newItems, true); | ||
| } | ||
| } | ||
|
|
||
| private static void SetItemsSelection(RadGridView gridView, IList items, bool shouldSelect) | ||
| { | ||
| foreach (var item in items) | ||
| { | ||
| bool contains = gridView.SelectedItems.Contains(item); | ||
| if (shouldSelect && !contains) | ||
| { | ||
| gridView.SelectedItems.Add(item); | ||
| } | ||
| else if (contains && !shouldSelect) | ||
| { | ||
| gridView.SelectedItems.Remove(item); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private static void AddAssociation(INotifyCollectionChanged collection, RadGridView gridView) | ||
| { | ||
| List<RadGridView> gridViews = GetOrCreateGridViews(collection); | ||
| gridViews.Add(gridView); | ||
| } | ||
|
|
||
| private static void RemoveAssociation(INotifyCollectionChanged collection, RadGridView gridView) | ||
| { | ||
| List<RadGridView> gridViews = GetOrCreateGridViews(collection); | ||
| gridViews.Remove(gridView); | ||
|
|
||
| if (gridViews.Count == 0) | ||
| { | ||
| CleanUp(); | ||
| } | ||
| } | ||
|
|
||
| private static List<RadGridView> GetOrCreateGridViews(INotifyCollectionChanged collection) | ||
| { | ||
| for (int i = 0; i < collectionToGridViews.Count; i++) | ||
| { | ||
| var wr = collectionToGridViews[i].Item1; | ||
| if (wr.Target == collection) | ||
| { | ||
| return collectionToGridViews[i].Item2; | ||
| } | ||
| } | ||
|
|
||
| collectionToGridViews.Add(new Tuple<WeakReference, List<RadGridView>>(new WeakReference(collection), new List<RadGridView>())); | ||
| return collectionToGridViews[collectionToGridViews.Count - 1].Item2; | ||
| } | ||
|
|
||
| private static void CleanUp() | ||
| { | ||
| for (int i = collectionToGridViews.Count - 1; i >= 0; i--) | ||
| { | ||
| bool isAlive = collectionToGridViews[i].Item1.IsAlive; | ||
| var behaviors = collectionToGridViews[i].Item2; | ||
| if (behaviors.Count == 0 || !isAlive) | ||
| { | ||
| collectionToGridViews.RemoveAt(i); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
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42 changes: 2 additions & 40 deletions
42
ChartView/SL/BindingSelectedItemsToViewModel/MainPage.xaml.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,51 +1,13 @@ | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.Linq; | ||
| using System.Net; | ||
| using System.Windows; | ||
| using System.Windows.Controls; | ||
| using System.Windows.Documents; | ||
| using System.Windows.Input; | ||
| using System.Windows.Media; | ||
| using System.Windows.Media.Animation; | ||
| using System.Windows.Shapes; | ||
| using System.Windows.Controls; | ||
|
|
||
| namespace BindingSelectedItemsToViewModel | ||
| { | ||
| public partial class MainPage : UserControl | ||
| { | ||
| private MainViewModel viewModel; | ||
|
|
||
| public MainPage() | ||
| { | ||
| InitializeComponent(); | ||
| this.viewModel = new MainViewModel(); | ||
| this.DataContext = this.viewModel; | ||
| } | ||
|
|
||
| private void gridView_SelectionChanged(object sender, Telerik.Windows.Controls.SelectionChangeEventArgs e) | ||
| { | ||
| if (e.AddedItems != null) | ||
| { | ||
| foreach (DataItem item in e.AddedItems) | ||
| { | ||
| if (!this.viewModel.SelectedCartesianDataItems.Contains(item)) | ||
| { | ||
| this.viewModel.SelectedCartesianDataItems.Add(item); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| if (e.RemovedItems != null) | ||
| { | ||
| foreach (DataItem item in e.RemovedItems) | ||
| { | ||
| if (this.viewModel.SelectedCartesianDataItems.Contains(item)) | ||
| { | ||
| this.viewModel.SelectedCartesianDataItems.Remove(item); | ||
| } | ||
| } | ||
| } | ||
| this.DataContext = new MainViewModel(); | ||
| } | ||
| } | ||
| } |
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