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Marcin
335
Stretch ExpandableFieldRecordPresenter vertically.
posted

How can I stretch ExpandableFieldRecordPresenter vertically such that it will occupy whole width of XamDataGrid.

I was unable to find any property in XamDataGrid but by using Snoop utility I've found that I need to set HorizontalAlignment=Stretch on ExpandableFieldRecordPresenter and on ancestor element named PART_NestedContentSite, on the latter I also had to set Grid.ColumnSpan=3.

I am currently using attached property with changed handler that walks visual tree and does what is needed but it's a hack.

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  • 335
    posted

    Code of my hack:

    public static readonly DependencyProperty NestedContentHorizontalAlignmentProperty =
    DependencyProperty.RegisterAttached("NestedContentHorizontalAlignment", typeof (HorizontalAlignment),
                                        typeof (XamDataGridHelper),
                                        new PropertyMetadata(default(HorizontalAlignment),
                                                                OnNestedContentHorizontalAlignmentChanged));
 
private static void OnNestedContentHorizontalAlignmentChanged(DependencyObject d,
                                                                DependencyPropertyChangedEventArgs ev)
{
    var presenter = (ExpandableFieldRecordPresenter) d;
    var newValue = (HorizontalAlignment) ev.NewValue;
 
    presenter.SetCurrentValue(FrameworkElement.HorizontalAlignmentProperty, newValue);
 
    var parent = VisualTreeHelper.GetParent(d);
    while (parent != null)
    {
        var parentFE = parent as FrameworkElement;
        if (parentFE != null && parentFE.Name == "PART_NestedContentSite")
        {
            // XXX this will break if style will change significantly
            var grid = VisualTreeHelper.GetParent(parentFE) as Grid;
            Debug.Assert(grid != null, "Incompatible style template of XamDataGrid");
            if (grid != null)
            {
                parentFE.SetCurrentValue(FrameworkElement.HorizontalAlignmentProperty,
                                            HorizontalAlignment.Stretch);
                parentFE.SetCurrentValue(Grid.ColumnSpanProperty, 3);
                grid.Dispatcher.BeginInvoke(new Action(grid.InvalidateMeasure), DispatcherPriority.Background);
            }
            return;
        }
 
        parent = VisualTreeHelper.GetParent(parent);
    }
 
    Debug.Fail("Could not set NestedContentHorizontalAlignment on XamDataGrid, incompatible style template");
}
 
public static void SetNestedContentHorizontalAlignment(ExpandableFieldRecordPresenter element, HorizontalAlignment value)
{
    element.SetValue(NestedContentHorizontalAlignmentProperty, value);
}
 
public static HorizontalAlignment GetNestedContentHorizontalAlignment(ExpandableFieldRecordPresenter element)
{
    return (HorizontalAlignment)element.GetValue(NestedContentHorizontalAlignmentProperty);
}
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