protected override void RefreshElements()
{
if (_mapControl == null)
{
return;
}
if (!IsActive)
{
RemoveElements();
_state = RulerState.None;
return;
}
switch (_state)
{
case RulerState.None:
RemoveElements();
break;
case RulerState.SingleMarker:
if (!_mapControl.UpperLayer.Children.Contains(_p1))
{
_mapControl.UpperLayer.Children.Add(_p1);
}
_mapControl.UpperLayer.Children.Remove(_p2);
_mapControl.UpperLayer.Children.Remove(_line);
_mapControl.UpperLayer.Children.Remove(_label);
break;
case RulerState.Full:
if (!_mapControl.UpperLayer.Children.Contains(_label))
{
_mapControl.UpperLayer.Children.Add(_label);
}
if (!_mapControl.UpperLayer.Children.Contains(_line))
{
_mapControl.UpperLayer.Children.Add(_line);
}
if (!_mapControl.UpperLayer.Children.Contains(_p1))
{
_mapControl.UpperLayer.Children.Add(_p1);
}
if (!_mapControl.UpperLayer.Children.Contains(_p2))
{
_mapControl.UpperLayer.Children.Add(_p2);
}
break;
default:
throw new ArgumentOutOfRangeException();
}
}
private void SetNextState()
{
if (_state == RulerState.None)
{
_state = RulerState.SingleMarker;
}
else if (_state == RulerState.SingleMarker)
{
_state = RulerState.Full;
}
else if (_state == RulerState.Full)
{
_state = RulerState.SingleMarker;
}
}
protected override void Reset()
{
_state = RulerState.None;
}
