private void RemoveFromSubjects(SubjectViewModel subjectVM)
{
UnhookEvents(subjectVM);
_subjects.Remove(subjectVM);
}
private void AddToSubjects(SubjectViewModel vm)
{
AttachEvents(vm);
_subjects.Add(vm);
}
private void InsertIntoSubjects(int idx, SubjectViewModel subjectVM)
{
AttachEvents(subjectVM);
_subjects.Insert(idx, subjectVM);
}
private void UnhookEvents(SubjectViewModel svm)
{
svm.RequestDeletionEvent -= DeleteSubject;
svm.RequestEditCommand -= EditSubject;
}
private void AttachEvents(SubjectViewModel subject)
{
subject.RequestDeletionEvent += new EventHandler(DeleteSubject);
subject.RequestEditCommand += new EventHandler(EditSubject);
}
void EditCompleted(object sender, EventArgs e)
{
var editingVM = sender as EditingSubjectViewModel;
if (editingVM != null)
{
int idx = _subjects.IndexOf(editingVM);
RemoveFromSubjects(editingVM);
var subjectVM = new SubjectViewModel(editingVM.Subject);
if (idx >= 0)
{
InsertIntoSubjects(idx, subjectVM);
}
else
{
AddToSubjects(subjectVM);
}
DecreaseDirtyLevel();
}
}
