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Strange "behavior" using a behavior

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GridView
This is a migrated thread and some comments may be shown as answers.
Håkan
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Håkan asked on 29 Jan 2014, 01:27 PM
Hi!

When using the filter control I would like the apply filter button to close the filter control.
I found a behavior that takes care of this looking like this:

using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Interactivity;
using Telerik.Windows.Controls;
using Telerik.Windows.Controls.GridView;
 
namespace Soe.Silverlight.Behaviors
{
    /// <summary>
    /// A behavior that closes the filtering popup of a column when the Apply Filter button is clicked.
    /// </summary>
    public class ClosePopupOnApplyFilterBehavior : Behavior<GridViewBoundColumnBase>
    {
        FilteringControl customFilteringControl;
        Button applyFilterButton;
 
        /// <summary>
        /// Called after the behavior is attached to an AssociatedObject.
        /// </summary>
        /// <remarks>Override this to hook up functionality to the AssociatedObject.</remarks>
        protected override void OnAttached()
        {
            // This is the control that RadGridView uses internally if you don't specify a custom filtering control through the GridViewBoundColumnBase.FilteringControl property.
            // We will create an instance of this default filtering control and use it as a "custom" filtering control in order to extend just a little bit with our custom logic.
            // Everything else will be the same.
            this.customFilteringControl = new FilteringControl();
            this.customFilteringControl.Loaded += this.OnFilteringControlLoaded;
 
            // Tell the column to use our new "custom" filtering control.
            // It will never now that this is the default one but spicied up a little.
            this.AssociatedObject.FilteringControl = customFilteringControl;
        }
 
        private void OnFilteringControlLoaded(object sender, RoutedEventArgs e)
        {
            // When it loads and all of its children are alive find the "Filter" button which is the only button on the control.
            // You can find out what its name is from the FilteringControl template.
            this.applyFilterButton = this.customFilteringControl.ChildrenOfType<Button>().Where(b => b.Name == "PART_ApplyFilterButton").FirstOrDefault();
            if (this.applyFilterButton != null)
                this.applyFilterButton.Click += this.OnApplyFilter;
        }
 
        private void OnApplyFilter(object sender, RoutedEventArgs e)
        {
            // And when clicked find the parent popup and close it.
            var popup = applyFilterButton.ParentOfType<System.Windows.Controls.Primitives.Popup>();
            if (popup != null)
                popup.IsOpen = false;
        }
 
        /// <summary>
        /// Called when the behavior is being detached from its AssociatedObject,
        /// but before it has actually occurred.
        /// </summary>
        /// <remarks>Override this to unhook functionality from the AssociatedObject.</remarks>
        protected override void OnDetaching()
        {
            if (this.applyFilterButton != null)
                this.applyFilterButton.Click -= this.OnApplyFilter;
 
            this.customFilteringControl.Loaded -= this.OnFilteringControlLoaded;
        }
    }
}

The problem is that when I use it, the funnel is displayed before any data is loaded into the grid.
As default, the funnel is only visible when the grid contains data.
If I click on the funnel when the grid is empty I get the following exception:

This columns cannot be filtered.
 
 
   at Telerik.Windows.Controls.GridViewColumn.get_AvailableFilterOperators()
   at Telerik.Windows.Controls.GridViewColumn.Telerik.Windows.Controls.IFilterableColumn.get_AvailableFilterOperators()
   at Telerik.Windows.Controls.GridViewColumn.Telerik.Windows.Controls.IFilterableColumn.CallFilterOperatorsLoading()
   at Telerik.Windows.Controls.GridView.FilteringViewModel.RefreshFieldFilters()
   at Telerik.Windows.Controls.GridView.FilteringViewModel.Refresh()
   at Telerik.Windows.Controls.GridView.FilteringControl.Prepare(GridViewColumn column)
   at Telerik.Windows.Controls.GridView.FilteringDropDown.PrepareFilteringControl()
   at Telerik.Windows.Controls.GridView.FilteringDropDown.OnDropDownPopupOpened(Object sender, EventArgs e)
   at Telerik.Windows.Controls.AutoClosePopupWrapper.OnPopupOpened(Object sender, EventArgs e)
   at MS.Internal.CoreInvokeHandler.InvokeEventHandler(UInt32 typeIndex, Delegate handlerDelegate, Object sender, Object args)
   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName, UInt32 flags)

How can I work around this?

Is there any better way than using a behavior for it?

Regads,
Håkan

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Yoan
Telerik team
answered on 03 Feb 2014, 12:13 PM
Hi Håkan,

I have just replied to the other forum thread on the same topic.


Regards,
Yoan
Telerik
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Håkan
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answered on 04 Feb 2014, 10:40 AM
Sorry!

My post got published twice for some reason...

Regards,
Håkan
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Yoan
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Håkan
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