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Method ExpandAllHierarchyItems() expands GridViewRows with property "IsExpandable" at False ?

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TheFlo
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TheFlo asked on 08 Mar 2012, 01:28 PM
Hello !

I'm using a custom hierarchy on a RadGridView as defined below :

<telerik:RadGridView x:Name="rgvAttributes" AutoGenerateColumns="False" CanUserDeleteRows="False"
                     IsReadOnlyBinding
="{Binding IsEditAttributesGrid,Mode=TwoWay}"
                    
ItemsSource="{Binding ListEntries}"
                    
SelectedItem="{Binding SelectedAttribute, Mode=TwoWay}" SelectionMode="Single">
    <i:Interaction.Behaviors>
        <helper:IsExpandableBehavior IsExpandableSourcePropertyName="IsExpandable" />
    </i:Interaction.Behaviors>
    <telerik:RadGridView.ChildTableDefinitions>
        <telerik:GridViewTableDefinition />
    </telerik:RadGridView.ChildTableDefinitions>
    <telerik:RadGridView.Columns>
        [...]
    </telerik:RadGridView.Columns>
    <telerik:RadGridView.HierarchyChildTemplate>
        <DataTemplate>
            <Control:ContentStepVisualizer />
        </DataTemplate>
    </telerik:RadGridView.HierarchyChildTemplate>
</telerik:RadGridView>

In order to hide the Expand/Collapse Hierarchy button on several rows, I'm using the following method :
  1. As the name explains, the simple behavior "IsExpandableBehavior" is used to bind the "IsExpandable" property of each GridViewRow to the corresponding object property of the ObservableCollection<Attribute> ListEntries in my ViewModel,
  2. Setting the "IsExpandable" property of one of the Attribute object to False correctly hide the Expand/Collapse Hierarchy button of the corresponding row in the RadGridView.

When calling ExpandAllHierarchyItems() on the RadGridView, every hidden Expand/Collapse Hierarchy buttons appears back and every row expands.

It seems that the ExpandAllHierarchyItems() of RadGridView methods doesn't consider the state of the "IsExpandable" property before expanding a GridViewRow.

Is this the desired behavior or I have done something wrong provoking it ?

Many thanks for your help !

TheFlo

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Dimitrina
Telerik team
answered on 12 Mar 2012, 11:02 AM
Hi,

 I have tested how the ExpandAllHierarchyItems() overrides the "IsExpandable" property of the GridViewRow. I was not able to reproduce such a behaviour.

Would it be possible for you to send me a simple running project to show what your behaviour do?

All the best,
Didie
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TheFlo
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answered on 12 Mar 2012, 01:07 PM
Hi Didie,

Thanks for you reply.

I've opened a support ticket (ID 521701) with a full running project attached.
This project shows two RadGridViews :
  • One using the Behavior "IsExpandableBehavior" to hide the Expand / Collapse button of the GridViewRow
  • One using the event "RowLoaded" to hide the Expand / Collapse button of the GridViewRow using the code given in the Custom Hierarchy Demo example
  • Each RadGridView has a button above to Expand / Collapse all rows.
  • As I click on each button, the GridViews expand all GridViewRows Hierarchy even those who have the property "IsExpandable" to False.

Hope this project will help.

May thanks for your support,

TheFlo

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Dimitrina
Telerik team
answered on 12 Mar 2012, 03:30 PM
Hi,

 Indeed I can confirm that this is a bug into the RadGridView. This issue has been logged into our Public Issue Tracking System under ID 9443

We apologise for the inconvenience caused. 

Regards,
Didie
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Aaron
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answered on 17 Sep 2012, 11:08 PM
It is extremely frustrating that this hasn't yet been resolved.

I'm using the following as a workaround:

private void ReportGrid_RowIsExpandedChanging(object sender, Telerik.Windows.Controls.GridView.RowCancelEventArgs e)
{
    // This is a workaround for "ExpandAllHierarchyItems" issue expanding things that shouldn't be expanded.
    GridViewRow row = e.Row as GridViewRow;
    if (row != null && !row.IsExpandable && !row.IsExpanded)
    {
        e.Cancel = true;
    }
}
 
private void ReportGrid_RowLoaded(object sender, RowLoadedEventArgs e)
{
    // This is a workaround for "ExpandAllHierarchyItems" issue expanding things that shouldn't be expanded.
    GridViewRow row = e.Row as GridViewRow;
    if (row != null && !row.IsExpandable)
    {
        // Force it to re-evaluate the visual state
        Telerik.Windows.Controls.RadGridView grid = sender as Telerik.Windows.Controls.RadGridView;
        grid.CollapseHierarchyItem(row.Item);
 
        // Force it to re-evaluate the style
        row.IsExpandable = true;
        row.IsExpandable = false;
    }
}


I'm using this in conjunction with a RowStyleSelector that exists in my xaml that sets "IsExpandable" based upon one of my properties
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TheFlo
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Dimitrina
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TheFlo
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Aaron
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