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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,4 +1,4 @@ | ||
| ## Selected Items Binding ## | ||
| ##Selected Items Binding## | ||
| This example demonstrates how to bind the selected items of the RadComboBox control to a property in your ViewModel class. | ||
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| <keywords:selected, items, binding> | ||
| <keywords:selected, items, binding> |
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|---|---|---|
| @@ -1,8 +1,7 @@ | ||
| <Application x:Class="WpfApplication1.App" | ||
| <Application x:Class="BindingSelectedItemsFromViewModel.App" | ||
| xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" | ||
| xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" | ||
| StartupUri="MainWindow.xaml"> | ||
| <Application.Resources> | ||
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| <Application.Resources> | ||
| </Application.Resources> | ||
| </Application> |
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| @@ -1,8 +1,6 @@ | ||
| <Application xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" | ||
| xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" | ||
| x:Class="SilverlightApplication1.App" | ||
| > | ||
| <Application.Resources> | ||
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| x:Class="BindingSelectedItemsFromViewModel.App"> | ||
| <Application.Resources> | ||
| </Application.Resources> | ||
| </Application> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,25 @@ | ||
| <UserControl x:Class="BindingSelectedItemsFromViewModel.Example" | ||
| xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" | ||
| xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" | ||
| xmlns:d="http://schemas.microsoft.com/expression/blend/2008" | ||
| xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" | ||
| xmlns:local="clr-namespace:BindingSelectedItemsFromViewModel" | ||
| xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation" | ||
| mc:Ignorable="d" | ||
| d:DesignHeight="300" d:DesignWidth="400"> | ||
| <Grid x:Name="LayoutRoot" Background="White"> | ||
| <Grid.RowDefinitions> | ||
| <RowDefinition /> | ||
| <RowDefinition Height="30" /> | ||
| <RowDefinition /> | ||
| </Grid.RowDefinitions> | ||
| <telerik:RadGridView ItemsSource="{Binding View}" SelectionMode="Extended" Margin="5" | ||
| local:GridViewSelectionUtilities.SelectedItems="{Binding SelectedItems}"> | ||
| <telerik:RadGridView.Columns> | ||
| <telerik:GridViewSelectColumn /> | ||
| </telerik:RadGridView.Columns> | ||
| </telerik:RadGridView> | ||
| <TextBlock Text="SelectedItems:" Margin="5" Grid.Row="1" /> | ||
| <ListBox ItemsSource="{Binding SelectedItems}" DisplayMemberPath="ID" Grid.Row="2" Margin="5" /> | ||
| </Grid> | ||
| </UserControl> |
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14
GridView/BindingSelectedItemsFromViewModel/Example.xaml.cs
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| using System.Windows.Controls; | ||
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| namespace BindingSelectedItemsFromViewModel | ||
| { | ||
| public partial class Example : UserControl | ||
| { | ||
| public Example() | ||
| { | ||
| InitializeComponent(); | ||
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| DataContext = new MyDataContext(); | ||
| } | ||
| } | ||
| } |
164 changes: 164 additions & 0 deletions
164
GridView/BindingSelectedItemsFromViewModel/GridViewSelectionUtilities.cs
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| using System; | ||
| using System.Collections; | ||
| using System.Collections.Generic; | ||
| using System.Collections.Specialized; | ||
| using System.Windows; | ||
| using Telerik.Windows.Controls; | ||
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| namespace BindingSelectedItemsFromViewModel | ||
| { | ||
| public static class GridViewSelectionUtilities | ||
| { | ||
| private static bool isSyncingSelection; | ||
| private static List<Tuple<WeakReference, List<RadGridView>>> collectionToGridViews = new List<Tuple<WeakReference, List<RadGridView>>>(); | ||
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| public static readonly DependencyProperty SelectedItemsProperty = DependencyProperty.RegisterAttached( | ||
| "SelectedItems", | ||
| typeof(INotifyCollectionChanged), | ||
| typeof(GridViewSelectionUtilities), | ||
| new PropertyMetadata(null, OnSelectedItemsChanged)); | ||
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| public static INotifyCollectionChanged GetSelectedItems(DependencyObject obj) | ||
| { | ||
| return (INotifyCollectionChanged)obj.GetValue(SelectedItemsProperty); | ||
| } | ||
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| public static void SetSelectedItems(DependencyObject obj, INotifyCollectionChanged value) | ||
| { | ||
| obj.SetValue(SelectedItemsProperty, value); | ||
| } | ||
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| private static void OnSelectedItemsChanged(DependencyObject target, DependencyPropertyChangedEventArgs args) | ||
| { | ||
| var gridView = (RadGridView)target; | ||
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| var oldCollection = args.OldValue as INotifyCollectionChanged; | ||
| if (oldCollection != null) | ||
| { | ||
| gridView.SelectionChanged -= GridView_SelectionChanged; | ||
| oldCollection.CollectionChanged -= SelectedItems_CollectionChanged; | ||
| RemoveAssociation(oldCollection, gridView); | ||
| } | ||
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| 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); | ||
| } | ||
| } | ||
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| private static void SelectedItems_CollectionChanged(object sender, NotifyCollectionChangedEventArgs args) | ||
| { | ||
| INotifyCollectionChanged collection = (INotifyCollectionChanged)sender; | ||
| OnSelectedItemsChanged(collection, args.OldItems, args.NewItems); | ||
| } | ||
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| private static void GridView_SelectionChanged(object sender, SelectionChangeEventArgs args) | ||
| { | ||
| if (isSyncingSelection) | ||
| { | ||
| return; | ||
| } | ||
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| var collection = (IList)GetSelectedItems((RadGridView)sender); | ||
| foreach (object item in args.RemovedItems) | ||
| { | ||
| collection.Remove(item); | ||
| } | ||
| foreach (object item in args.AddedItems) | ||
| { | ||
| collection.Add(item); | ||
| } | ||
| } | ||
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| private static void OnSelectedItemsChanged(INotifyCollectionChanged collection, IList oldItems, IList newItems) | ||
| { | ||
| isSyncingSelection = true; | ||
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| var gridViews = GetOrCreateGridViews(collection); | ||
| foreach (var gridView in gridViews) | ||
| { | ||
| SyncSelection(gridView, oldItems, newItems); | ||
| } | ||
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| isSyncingSelection = false; | ||
| } | ||
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| private static void SyncSelection(RadGridView gridView, IList oldItems, IList newItems) | ||
| { | ||
| if (oldItems != null) | ||
| { | ||
| SetItemsSelection(gridView, oldItems, false); | ||
| } | ||
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| if (newItems != null) | ||
| { | ||
| SetItemsSelection(gridView, newItems, true); | ||
| } | ||
| } | ||
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| 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); | ||
| } | ||
| } | ||
| } | ||
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| private static void AddAssociation(INotifyCollectionChanged collection, RadGridView gridView) | ||
| { | ||
| List<RadGridView> gridViews = GetOrCreateGridViews(collection); | ||
| gridViews.Add(gridView); | ||
| } | ||
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| private static void RemoveAssociation(INotifyCollectionChanged collection, RadGridView gridView) | ||
| { | ||
| List<RadGridView> gridViews = GetOrCreateGridViews(collection); | ||
| gridViews.Remove(gridView); | ||
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| if (gridViews.Count == 0) | ||
| { | ||
| CleanUp(); | ||
| } | ||
| } | ||
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| 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; | ||
| } | ||
| } | ||
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| collectionToGridViews.Add(new Tuple<WeakReference, List<RadGridView>>(new WeakReference(collection), new List<RadGridView>())); | ||
| return collectionToGridViews[collectionToGridViews.Count - 1].Item2; | ||
| } | ||
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| 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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