internal void IncreaseZoneIndex( VMZoneEditable zone )
{
Debug.Assert( Zones.IndexOf( zone ) == zone.Index );
if( zone.Index < Zones.Count - 1 )
{
SwitchZones( zone, Zones.ElementAt( zone.Index + 1 ) );
}
}
private void SwitchZones( VMZoneEditable firstZone, VMZoneEditable secondZone )
{
if( firstZone == null || secondZone == null ) throw new ArgumentNullException( "One of the zones asking to be switched is null" );
Debug.Assert( Zones.Contains( firstZone ) && Zones.Contains( secondZone ) );
Zones.Remove( firstZone );
Zones.Insert( firstZone.Index, secondZone );
Zones.Remove( secondZone );
Zones.Insert( secondZone.Index, firstZone );
int firstZoneIdx = firstZone.Index;
firstZone.Index = secondZone.Index;
secondZone.Index = firstZoneIdx;
OnPropertyChanged( "Zones" );
}
internal void DecreaseZoneIndex( VMZoneEditable zone )
{
Debug.Assert( Zones.IndexOf( zone ) == zone.Index );
if( zone.Index > 0 )
{
SwitchZones( zone, Zones.ElementAt( zone.Index - 1 ) );
}
}
