/// <summary>
/// Restores (un-deletes) this feature.
/// </summary>
/// <returns>True if feature restored. False if the feature wasn't marked as inactive.</returns>
internal virtual bool Restore()
{
// Return if this feature doesn't currently have the "inactive" state
if (!IsInactive)
{
return(false);
}
// If this feature referred to an ID, restore it.
if (m_Id != null)
{
// Ensure that the ID is cross-referenced to this feature.
m_Id.AddReference(this);
// That's pretty well it. When a feature is de-activated, only the back
// pointer from the ID is nulled out. The feature retained it's pointer to the ID,
// and the ID itself was left in place as part of the IdPacket to which it belongs.
// For native IDs, the packet needs to be told to decrement the number of free
// IDs.
// TODO: This may be irrelevant (need to also review the logic when something is
// de-activated).
if (m_Id is NativeId)
{
IdManager idMan = MapModel.IdManager;
if (idMan != null)
{
// Find the ID group that applies to the feature's
// entity type (this will be null if the entity type was
// not originally listed in the IdEntity table, or the
// group is considered to be obsolete).
IdGroup g = idMan.GetGroup(this.EntityType);
// If we got a group (and the ID if not foreign) try to find
// the ID packet that refers to the feature's ID.
if (g != null)
{
NativeId nid = (m_Id as NativeId);
IdPacket p = g.FindPacket(nid);
p.RestoreId(m_Id);
}
}
}
}
// Add back into the map index.
MapModel.EditingIndex.AddFeature(this);
// Remember that the feature is now active
IsInactive = false;
return(true);
}
/// <summary>
/// Load an ID combo box with all the available IDs for a specific entity type.
/// </summary>
/// <param name="box">The combo box (not null)</param>
/// <param name="ent">The entity type that the combo is for (if null, the combo will
/// be empty)</param>
/// <param name="handle">The ID handle that should be defined to correspond with the
/// first available ID (may be null). If there are no available IDs for the specified
/// entity type, any ID previously reserved will be released.</param>
/// <returns>The number of IDs that were loaded into the combo (if any)</returns>
internal static int LoadIdCombo(ComboBox box, IEntity ent, IdHandle handle)
{
if (box == null)
{
throw new ArgumentNullException();
}
// Clear out anything that was in the combo before.
box.Items.Clear();
if (ent == null)
{
return(0);
}
// Get a list of all the available IDs for the specified entity type...
IdManager idMan = CadastralMapModel.Current.IdManager;
if (idMan == null)
{
return(0);
}
IdGroup group = idMan.GetGroup(ent);
if (group == null)
{
return(0);
}
// Get the available IDs for the group
uint[] avail = group.GetAvailIds();
// If we didn't find any, obtain an extra allocation
if (avail.Length == 0)
{
IdPacket newPacket = group.GetAllocation(true); // with announcement
avail = group.GetAvailIds();
if (avail.Length == 0)
{
throw new ApplicationException("Cannot obtain ID allocation");
}
}
// Load the combo
DisplayId[] ids = new DisplayId[avail.Length];
for (int i = 0; i < ids.Length; i++)
{
ids[i] = new DisplayId(group, avail[i]);
}
box.Items.AddRange(ids);
// Reserve the first available ID if a handle was supplied (and select it)
if (handle != null)
{
IdPacket p = group.FindPacket(avail[0]);
handle.ReserveId(p, ent, avail[0]);
box.SelectedItem = ids[0];
}
return(avail.Length);
}
