public void RemoveMessenger(Messenger focusedMessenger)
{
MessengerCache.Remove(MessengerCache.SingleOrDefault(i => i.Id == focusedMessenger.Id));
if (DisplayedMessengers.Count() == 0)
{
if (IsPreviousPageButtonEnabled)
{
PreviousPage();
return;
}
else if (IsMoveUpButtonEnabled)
{
MoveUpALevel();
return;
}
}
if (focusedMessenger.Id == ParentMessenger.Id)
{
MoveUpALevel();
return;
}
//Move the last element from tha cache to the displayed messengers if needed.
int maxElementCountOnAPage = MaxColumnCount * MaxRowCount;
if (DisplayedMessengers.Count() < maxElementCountOnAPage && IsNextPageButtonEnabled)
{
int indexTo = CurrentPageNumber * maxElementCountOnAPage;
DisplayedMessengers.Add(MessengerCache[indexTo - 1]);
}
NextPageButtonStateCalculator();
}
public void NextPageButtonStateCalculator()
{
if (MessengerCache.Count() > CurrentPageNumber * (MaxColumnCount * MaxRowCount))
{
IsNextPageButtonEnabled = true;
}
else
{
IsNextPageButtonEnabled = false;
}
}
private void LoadMessengers()
{
int maxElementCountOnAPage = MaxColumnCount * MaxRowCount;
int indexFrom = (CurrentPageNumber - 1) * maxElementCountOnAPage;
int indexTo = CurrentPageNumber * maxElementCountOnAPage;
DisplayedMessengers.Clear();
for (; (indexFrom < indexTo && indexFrom < MessengerCache.Count()); indexFrom++)
{
DisplayedMessengers.Add(MessengerCache[indexFrom]);
}
CalculateButtonStates();
}
