/// <summary>
/// Starts the user interface (if any) for this command.
/// </summary>
/// <returns>True if command started ok.</returns>
internal override bool Run()
{
// Don't run more than once.
if (m_ParDial!=null || m_TermDial1!=null || m_TermDial2!=null)
throw new Exception("ParallelLineUI.Run - Command is already running.");
// If we're doing an update, get the reference line from the original op.
ParallelLineOperation op = null;
UpdateUI up = this.Update;
if (up!=null)
{
op = (up.GetOp() as ParallelLineOperation);
if (op==null)
throw new Exception("ParallelLineUI.Run - Unexpected edit type.");
// Pick up the line that acted as the reference line.
m_Line = op.ReferenceLine;
}
// If it wasn't an update, we might be recalling an old op.
if (op==null)
op = (this.Recall as ParallelLineOperation);
// Get old observations if necessary.
if (op!=null)
{
// Pick up the offset.
Observation offset = op.Offset;
// Is it an observed distance?
Distance dist = (offset as Distance);
if (dist!=null)
m_Offset = new Distance(dist);
else
{
// The only other thing it could be is an offset point.
OffsetPoint offPoint = (offset as OffsetPoint);
if (offPoint!=null)
m_OffsetPoint = offPoint.Point;
}
m_IsReversed = op.IsArcReversed;
m_TermLine1 = op.Terminal1;
m_TermLine2 = op.Terminal2;
// Ensure the reference line has been selected/highlighted (this may end up
// calling OnSelectLine)
EditingController.Current.Select(m_Line);
// Calculate stuff & paint what we've got.
Calculate();
Paint(null);
}
// Create modeless dialog.
if (up!=null)
m_ParDial = new ParallelControl(up);
else
m_ParDial = new ParallelControl(this);
this.Container.Display(m_ParDial);
return true;
}
/// <summary>
/// Destroys any dialogs that are currently displayed.
/// </summary>
void KillDialogs()
{
this.Container.Clear();
if (m_ParDial!=null)
{
m_ParDial.Dispose();
m_ParDial = null;
}
if (m_TermDial1!=null)
{
m_TermDial1.Dispose();
m_TermDial1 = null;
}
if (m_TermDial2!=null)
{
m_TermDial2.Dispose();
m_TermDial2 = null;
}
}
/// <summary>
/// Initializes everything with null values. For used by constructors.
/// </summary>
void SetZeroValues()
{
m_Line = null;
m_ParDial = null;
m_Offset = null;
m_OffsetPoint = null;
m_IsReversed = false;
m_TermDial1 = null;
m_TermLine1 = null;
m_TermDial2 = null;
m_TermLine2 = null;
m_Par1 = null;
m_Par2 = null;
m_Term1 = null;
m_Term2 = null;
}