internal void RemoveHost(ContentControl cc)
{
// make sure it is not null
if (cc == null)
{
return;
}
// make suer it is out host to begin with...
if (!_hosts.Contains(cc))
{
return;
}
if (RegionHost.GetRegion(cc) != null)
{
RegionHost.SetRegion(cc, null);
}
_hosts.Remove(cc);
// clear the binding
ChangeHostContentProperty(cc, RegionHost.GetContentProperty(cc), null);
}
internal void AddHost(ContentControl cc)
{
// first let's make sure we acutally get something as parameter
if (cc == null)
{
return;
}
// make sure the host really wants to be yours :-)
if (RegionHost.GetRegion(cc) != _region)
{
RegionHost.SetRegion(cc, _region);
}
// now make sure it is not already in the list of hosts
if (_hosts.Contains(cc))
{
return;
}
// so we actually need to set this as a new host
_hosts.Add(cc);
// remember to remove it when it is unloaded
cc.Unloaded += _onHostUnloaded;
// for window objects, unload is not enough, so we also listen to closed
if (cc is Window w)
{
w.Closed += (s, e) =>
{
RemoveHost(w);
};
}
ChangeHostContentProperty(cc, null, RegionHost.GetContentProperty(cc));
}