protected override void OnChildrenChanged(RadElement child, ItemsChangeOperation changeOperation)
{
base.OnChildrenChanged(child, changeOperation);
RadDropDownMenuElement menuElement = this.FindAncestor <RadDropDownMenuElement>();
if (menuElement == null)
{
return;
}
if (changeOperation == ItemsChangeOperation.Inserted || changeOperation == ItemsChangeOperation.Set)
{
DropDownPosition position = (DropDownPosition)menuElement.GetValue(RadDropDownMenuElement.DropDownPositionProperty);
foreach (RadElement element in child.ChildrenHierarchy)
{
element.SetValue(RadDropDownMenuElement.DropDownPositionProperty, position);
}
}
//This is needed after adding the scrolling support in RadDropDownMenuElement.
//since when adding items the scroll layout panel does not invalidate its parent's layout
//and thus wrong size of the RadDropDownMenu is calculated, we need to invalidate the
//main element's layout explicitly to force recalculation of the popup's size.
//This behavior is needed only when adding items in design mode.
menuElement.InvalidateMeasure();
}
protected override void OnChildrenChanged(
RadElement child,
ItemsChangeOperation changeOperation)
{
base.OnChildrenChanged(child, changeOperation);
RadDropDownMenuElement ancestor = this.FindAncestor <RadDropDownMenuElement>();
if (ancestor == null)
{
return;
}
if (changeOperation == ItemsChangeOperation.Inserted || changeOperation == ItemsChangeOperation.Set)
{
DropDownPosition dropDownPosition = (DropDownPosition)ancestor.GetValue(RadDropDownMenuElement.DropDownPositionProperty);
foreach (RadObject radObject in child.ChildrenHierarchy)
{
int num = (int)radObject.SetValue(RadDropDownMenuElement.DropDownPositionProperty, (object)dropDownPosition);
}
}
ancestor.InvalidateMeasure();
}
public DropDown()
{
OpenPosition = DropDownPosition.Left;
}
