SelectAll on virtualized row selects even tough IsEnabled is false

[Ben]

Hallo,

I have the following situation:

- GridView with GridViewSelectColumn

- GridView ItemsSource bound with VirtualQueryableCollectionView

- GridViewRow is not always selectable (via IsEnabled), depending on the bound object
                        <Style TargetType="telerik:GridViewRow" BasedOn="{StaticResource GridViewRowStyle}">
                            <Setter Property="IsEnabled" Value="{Binding IsSelectable, Mode=OneWay}" />
                        </Style>

 

SelectAll is working properly, but only for the visual items.

Good: When triggering SelectAll, the visible GridViewRows which have IsEnabled = false, are not selected.

Bad: When triggering SelectAll, the not yet visualized GridViewRows will be selected once I scroll down in the list, thus ignoring the IsEnabled property on the gridviewrow.

 

Is there a way to fix this or am I missing something?

Thanks for your response!

Best regards,

Ben

[Ivan Ivanov]

Hello,

RadGridView's selection is item-based and SelectAll would mark all of the items as selected. However, VirtualQueriableCollectionView relies on lazy-loading of its items, so invoking SelectAll on RadGridView will select only the visible (loaded) items. When some new items are loaded by VQCV after scrolling out of the initial viewport, RadGridView does not have notion whether they have to be selected or not.
A possible customization that will enabled this behavior is to select the new items when they are loaded:

void VQCVItemsLoaded(object sender, VirtualQueryableCollectionViewItemsLoadedEventArgs e)
        {
            if (. . .)
            {
                clubsGrid.Select(e.Items);
            }
        }

However, they will stay referenced by RadGridView's selection logic, so they will not be released by VQCV after scrolling them out of the viewport. In accordance to the item count of the data source, it may be reasonable to unselect them when they are unloaded.

Regards,
Ivan Ivanov
Progress Telerik