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System.InvalidOperationException when docking

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Docking
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Maciej Czerwiakowski
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Maciej Czerwiakowski asked on 15 Dec 2009, 12:52 PM
I'm working on application using Prism and yours Q3 WPF controls. Unfortunately when I'm trying to dock control in another dock region the InvalidOperationException is thrown. Exception message says I should use ItemsControl.ItemsSource instead of ItemsSource and I really don`t known how to solve this.

Below you'll find my region adapter class, dockable view class and docking container declaration in main window

Region adapter
namespace LTD.Desktop.Common 
    public class RadPaneGroupRegionAdapter : RegionAdapterBase<RadPaneGroup> 
    { 
        public RadPaneGroupRegionAdapter(IRegionBehaviorFactory regionBehaviorFactory) 
            : base(regionBehaviorFactory) 
        { 
        } 
 
        protected override void Adapt(IRegion region, RadPaneGroup regionTarget) 
        { 
            region.Views.CollectionChanged += (s, e) => 
            { 
                switch (e.Action) 
                { 
                    case NotifyCollectionChangedAction.Add: 
                        foreach (var item in e.NewItems.OfType<RadPane>()) 
                        { 
                            regionTarget.AddItem(item, Telerik.Windows.Controls.Docking.DockPosition.Center); 
                        } 
                        break
                    case NotifyCollectionChangedAction.Remove: 
                        foreach (var item in e.OldItems.OfType<RadPane>()) 
                        { 
                            item.RemoveFromParent(); 
                        } 
                        break
                    case NotifyCollectionChangedAction.Replace: 
                        { 
                            var oldItems = e.OldItems.OfType<RadPane>(); 
                            var newItems = e.NewItems.OfType<RadPane>(); 
                            var newItemsEnumerator = newItems.GetEnumerator(); 
                            foreach (var oldItem in oldItems) 
                            { 
                                var parent = oldItem.Parent as ItemsControl; 
                                if (parent != null && parent.Items.Contains(oldItem)) 
                                { 
                                    parent.Items[parent.Items.IndexOf(oldItem)] = newItemsEnumerator.Current; 
                                    if (!newItemsEnumerator.MoveNext()) 
                                    { 
                                        break
                                    } 
                                } 
                                else 
                                { 
                                    oldItem.RemoveFromParent(); 
                                    regionTarget.Items.Add(newItemsEnumerator.Current); 
                                } 
                            } 
                        } 
                        break
                    case NotifyCollectionChangedAction.Reset: 
                        regionTarget 
                            .EnumeratePanes() 
                            .ToList() 
                            .ForEach(p => p.RemoveFromParent()); 
                        break
                    default
                        break
                } 
            }; 
 
            foreach (var view in region.Views.OfType<RadPane>()) 
            { 
                regionTarget.Items.Add(view); 
            } 
        } 
 
        protected override IRegion CreateRegion() 
        { 
            return new AllActiveRegion(); 
        } 
    } 

Dockable view
namespace LTD.Examples.Modularity.Views 
    /// <summary> 
    /// Interaction logic for ExampleView.xaml 
    /// </summary> 
    public partial class ExampleView : RadDocumentPane 
    { 
        public ExampleView() 
        { 
            InitializeComponent(); 
        } 
    } 

<telerik:RadDocumentPane x:Class="LTD.Examples.Modularity.Views.ExampleView" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation" 
    Header="Example panel"/> 
 

ExampleView class in design time also generate en error: Could not create an instance of type 'RadDocumentPane'

Views container:
<!-- Workspaces container --> 
        <telerik:RadDocking Name="Workspaces" DockPanel.Dock="Bottom" cal:RegionManager.RegionName="Workspaces"
            <telerik:RadDocking.DocumentHost> 
                <telerik:RadSplitContainer> 
                    <telerik:RadPaneGroup cal:RegionManager.RegionName="MainRegion" /> 
                </telerik:RadSplitContainer> 
            </telerik:RadDocking.DocumentHost> 
        </telerik:RadDocking> 

It's critical for me, so I'll be appreciate for any help.

Regards,
MC.

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Maciej Czerwiakowski
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answered on 15 Dec 2009, 01:32 PM
I`ve solved problem by changing docking declaration to:

<!-- Workspaces container --> 
<telerik:RadDocking> 
    <telerik:RadDocking.DocumentHost> 
        <telerik:RadSplitContainer> 
            <telerik:RadPaneGroup cal:RegionManager.RegionName="MainRegion" /> 
        </telerik:RadSplitContainer> 
    </telerik:RadDocking.DocumentHost> 
</telerik:RadDocking> 

and changing base class of dockable view form RadDocumantPane to RadPane.

Regards,
MC
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Kaloyan
Telerik team
answered on 17 Dec 2009, 09:00 AM
Hi Maciej Czerwiakowski,

Actually this is the right way for achieving this scenario. Also yon can grab some interesting ideas form this blog post.

Kind regards,
Kaloyan
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Maciej Czerwiakowski
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answered on 17 Dec 2009, 12:49 PM
HI Kaloyan !

Frankly speaking I took region adapter form MIroslav`s post on yours team blog :)
As I wrote in previous post problem was solved by changing docking declarations, so thanks for confirming my solution!

Regards,
MC.
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Docking
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Maciej Czerwiakowski
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Maciej Czerwiakowski
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Kaloyan
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