private static bool TryMoveElements(ImmutableArray <ProjectItemElement> elements, ProjectItemElement referenceElement, MoveAction moveAction)
{
Requires.NotNull(referenceElement, nameof(referenceElement));
ProjectElementContainer parent = referenceElement.Parent;
if (parent == null || !elements.Any())
{
return(false);
}
// Sanity check
bool didAllElementsMove = true;
switch (moveAction)
{
case MoveAction.Above:
foreach (ProjectItemElement element in elements)
{
ProjectElementContainer elementParent = element.Parent;
if (elementParent != null)
{
elementParent.RemoveChild(element);
parent.InsertBeforeChild(element, referenceElement);
}
else
{
didAllElementsMove = false;
}
}
break;
case MoveAction.Below:
// Iterate in reverse order when we are wanting to move elements down.
// If we didn't do this, the end result would be the moved elements are reversed.
for (int i = elements.Length - 1; i >= 0; --i)
{
ProjectItemElement element = elements[i];
ProjectElementContainer elementParent = element.Parent;
if (elementParent != null)
{
elementParent.RemoveChild(element);
parent.InsertAfterChild(element, referenceElement);
}
else
{
didAllElementsMove = false;
}
}
break;
}
return(didAllElementsMove);
}
private static void ProcessElementLocationOption(ProjectElementContainer container, ElementLocationOption option, ProjectElement element)
{
switch (option)
{
case ElementLocationOption.BeforeFirstChild:
{
ProjectElement firstChild = container.FirstChild;
container.InsertBeforeChild(element, firstChild);
break;
}
case ElementLocationOption.AfterLastChild:
{
ProjectElement lastChild = container.FirstChild;
container.InsertAfterChild(element, lastChild);
break;
}
default:
{
return;
}
}
}