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Strange "behavior" using a behavior

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GridView

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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

2 Answers, 1 is accepted

Accepted