public JtSelectionFilter(
Type t,
BuiltInCategory?bic,
IsSelectable f)
{
_t = t;
_bic = bic;
_f = f;
}
/// <summary>
/// Instantiate and run element selector.
/// </summary>
/// <param name="uidoc">UIDocument.</param>
/// <param name="bic">Built-in category or null.</param>
/// <param name="description">Description of the elements to select.</param>
/// <param name="f">Validation method.</param>
public JtSelectorMulti(
UIDocument uidoc,
BuiltInCategory?bic,
string description,
IsSelectable f)
{
_selected = null;
_msg = null;
Document doc = uidoc.Document;
if (null == doc)
{
_msg = "Please run this command in a valid"
+ " Revit project document.";
_result = Result.Failed;
}
// Check for pre-selected elements
Selection sel = uidoc.Selection;
ICollection <ElementId> ids = sel.GetElementIds();
int n = ids.Count;
if (0 < n)
{
//if( 1 != n )
//{
// _msg = _usage_error;
// _result = Result.Failed;
//}
foreach (ElementId id in ids)
{
Element e = doc.GetElement(id);
if (!f(e))
{
_msg = string.Format(
_usage_error, description);
_result = Result.Failed;
}
if (null == _selected)
{
_selected = new List <T>(n);
}
_selected.Add(e as T);
}
}
// If no elements were pre-selected,
// prompt for post-selection
if (null == _selected ||
0 == _selected.Count)
{
IList <Reference> refs = null;
try
{
refs = sel.PickObjects(
ObjectType.Element,
new JtSelectionFilter(typeof(T), bic, f),
string.Format(
"Please select {0}s.",
description));
}
catch (Autodesk.Revit.Exceptions
.OperationCanceledException)
{
_result = Result.Cancelled;
}
if (null != refs && 0 < refs.Count)
{
_selected = new List <T>(
refs.Select <Reference, T>(
r => doc.GetElement(r.ElementId)
as T));
}
}
Debug.Assert(
null == _selected || 0 < _selected.Count,
"ensure we return only non-empty collections");
_result = (null == _selected)
? Result.Cancelled
: Result.Succeeded;
}
