/// <summary>
/// Expands the current branch if possible
/// </summary>
public void Expand()
{
if (ChildBranches == null)
{
FetchChildren();
}
if (ChildBranches.Any())
{
IsExpanded = true;
}
}
/// <summary>
/// Returns true if the current branch can be expanded according to
/// the <see cref="TreeBuilder{T}"/> or cached children already fetched
/// </summary>
/// <returns></returns>
public bool CanExpand()
{
// if we do not know the children yet
if (ChildBranches == null)
{
//if there is a rapid method for determining whether there are children
if (tree.TreeBuilder.SupportsCanExpand)
{
return(tree.TreeBuilder.CanExpand(Model));
}
//there is no way of knowing whether we can expand without fetching the children
FetchChildren();
}
//we fetched or already know the children, so return whether we have any
return(ChildBranches.Any());
}