private void CompressEvent_CheckAvailability(Object sender, CheckContentAvailabilityEventArgs ea)
{
CodeRush.Documents.ActiveTextDocument.ParseIfNeeded();
_EventToCompress = GetEvent(ea.Caret);
// Exit if no Event found under caret
if (_EventToCompress == null)
return;
// Exit if _Event has no Add or Remove
if (_EventToCompress.Nodes.Count == 0)
return;
var EventAdd = (EventAdd)_EventToCompress.Nodes[0];
var EventRemove = (EventRemove)_EventToCompress.Nodes[1];
// Add and Remove must contain exactly one assignment statement
if (EventAdd.Nodes.Count != 1)
return;
if (EventRemove.Nodes.Count != 1)
return;
var EventAddAssign = (Assignment)EventAdd.Nodes[0];
var EventRemoveAssign = (Assignment)EventRemove.Nodes[0];
// Assignment Statements must assign to same variable
if (EventAddAssign.LeftSide.Name != EventRemoveAssign.LeftSide.Name)
return;
var EventField = EventAddAssign.LeftSide;
_EventToCompressFieldDeclaration = (Variable)EventField.GetDeclaration().ToLanguageElement();
// Variable must be of type EventHandler
if (_EventToCompressFieldDeclaration.MemberType != "EventHandler")
return;
// Variable must have 2 and only 2 references.
if (_EventToCompressFieldDeclaration.FindAllReferences().Count != 2)
return;
ea.Available = true;
}