private static void PropertyToSetFocusPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var control = d as SetFocusFromPropertyBehavior;
if (control != null && e.NewValue != null)
{
var nameToFind = string.Empty;
if (!string.IsNullOrEmpty(control.ParentPropertyToSetFocus))
{
nameToFind = control.ParentPropertyToSetFocus + "_" + e.NewValue.ToString();
}
else
{
nameToFind = e.NewValue.ToString();
}
var controlToSetFocus = control.AssociatedObject.FindName(nameToFind);
if (controlToSetFocus != null)
{
var c = controlToSetFocus as Control;
if (c != null)
{
AutoGenerateForm.Uwp.AutoGenerator generator = null;
if (control.AssociatedObject is AutoGenerateForm.Uwp.AutoGenerator)
{
generator = (AutoGenerateForm.Uwp.AutoGenerator)control.AssociatedObject;
}
else
{
generator = control.AssociatedObject.GetFirstDescendantOfType <AutoGenerateForm.Uwp.AutoGenerator>();
}
c.Focus(FocusState.Pointer);
if (generator == null)
{
Debug.WriteLine(" auto generator not found");
return;
}
else
{
control.SetViewForItem(c, generator);
}
}
}
}
}
internal async Task SetViewForItem(FrameworkElement item, AutoGenerateForm.Uwp.AutoGenerator generator)
{
var listView = generator.GetFirstDescendantOfType <ListView>();
var scrollViewer = listView.GetFirstDescendantOfType <ScrollViewer>();
if (scrollViewer == null)
{
Debug.WriteLine(" scrollviewer not found");
return;
}
var field = item.GetAncestorsOfType <Controls.FieldContainerControl>().FirstOrDefault();
ListViewItem listViewItem = null;
listViewItem = listView.ContainerFromItem(field) as ListViewItem;
// Calculations relative to screen or ListView
if (listViewItem == null)
{
Debug.WriteLine(" child element not found");
return;
}
var topLeft =
listViewItem
.TransformToVisual(generator)
.TransformPoint(new Point()).Y;
var lvih = listViewItem.ActualHeight;
var lvh = generator.ActualHeight;
var desiredTopLeft = (lvh - lvih) / 2.0;
var desiredDelta = topLeft - desiredTopLeft;
// Calculations relative to the ScrollViewer within the ListView
var currentOffset = scrollViewer.VerticalOffset;
var desiredOffset = currentOffset + desiredDelta;
scrollViewer.ChangeView(null, desiredOffset, null);
}