/// <summary>Replace <paramref name="existingChild"/> with <paramref name="newChild"/>, using the same role and preserving the ordering of children.</summary>
public void ReplaceChild(IElementTreeNode existingChild, IElementTreeNode newChild)
{
if (newChild != null)
{
ChildRole existingRole = RoleFor(existingChild);
ChildrenAndRoles.Remove(existingChild);
existingChild.Parent = null;
AddChildWithRole(newChild, existingRole);
UpdateChildOrderingReferences(existingChild, newChild);
}
else
{
RemoveChild(existingChild);
}
// Update the ChildOrdering references from oldReference to newReference
void UpdateChildOrderingReferences(IElementTreeNode oldReference, IElementTreeNode newReference)
{
foreach (ChildOrdering eachChildOrdering in ChildOrderings)
{
if (eachChildOrdering.Before == existingChild)
{
eachChildOrdering.Before = newChild;
}
if (eachChildOrdering.After == existingChild)
{
eachChildOrdering.After = newChild;
}
}
}
}
/// <summary>Return the immediate children of this having the supplied <paramref name="role"/>.</summary> private protected IEnumerable <IElementTreeNode> ChildrenWithRole(ChildRole role) => ChildrenAndRoles .Where(kvp => kvp.Value == role) .Select(kvp => kvp.Key);
/// <summary>Find all children with assigned role <paramref name="originalRole"/>, and change their role to <paramref name="newRole"/>.</summary> private protected void ChangeChildRoles(ChildRole originalRole, ChildRole newRole) => ChildrenWithRole(originalRole).ToList() .ForEach(childToChange => SetRoleOfChild(childToChange, newRole));
/// <summary>Change the role of an existing child <paramref name="child"/> to <paramref name="newRole"/>.</summary> public void SetRoleOfChild(IElementTreeNode child, ChildRole newRole) => ChildrenAndRoles[child] = newRole;
/// <summary>Add all the ElementBuilders in <paramref name="children"/> as children of this, with ChildRole <paramref name="role"/>.</summary> private protected void AddChildrenWithRole(IEnumerable <IElementTreeNode> newChildren, ChildRole role) => newChildren.ToList().ForEach(newChild => AddChildWithRole(newChild, role));
/// <summary>Add <paramref name="child"/> as a child of this, with ChildRole <paramref name="role"/></summary>
public void AddChildWithRole(IElementTreeNode child, ChildRole role)
{
ChildrenAndRoles.Add(child, role);
child.Parent = this;
}
