private void Delete(string commandName)
{
OnDeleting(EventArgs.Empty);
IInstancingContext instancingContext = m_contextRegistry.GetActiveContext <IInstancingContext>();
if (instancingContext != null &&
instancingContext.CanDelete())
{
ITransactionContext transactionContext = instancingContext.As <ITransactionContext>();
transactionContext.DoTransaction(
delegate
{
instancingContext.Delete();
ISelectionContext selectionContext = instancingContext.As <ISelectionContext>();
if (selectionContext != null)
{
selectionContext.Clear();
}
}, commandName);
}
OnDeleted(EventArgs.Empty);
}
/// <summary>
/// Returns a value indicating if the active context can delete the selection</summary>
/// <returns>True iff the active context can delete the selection</returns>
public bool CanDelete()
{
IInstancingContext instancingContext = m_contextRegistry.GetActiveContext <IInstancingContext>();
return
(instancingContext != null &&
instancingContext.CanDelete());
}
/// <summary>
/// Checks whether the client can do the command, if it handles it</summary>
/// <param name="commandTag">Command to be done</param>
/// <returns>True iff client can do the command</returns>
bool ICommandClient.CanDoCommand(object commandTag)
{
bool canDo = false;
IInstancingContext instancingContext = m_contextRegistry.GetActiveContext <IInstancingContext>();
switch ((StandardCommand)commandTag)
{
case StandardCommand.EditCut:
canDo =
instancingContext != null &&
instancingContext.CanCopy() &&
instancingContext.CanDelete();
break;
case StandardCommand.EditDelete:
canDo =
instancingContext != null &&
instancingContext.CanDelete();
break;
case StandardCommand.EditCopy:
canDo =
instancingContext != null &&
instancingContext.CanCopy();
break;
case StandardCommand.EditPaste:
canDo =
instancingContext != null &&
CanPaste();
break;
}
return(canDo);
}