Representation Status

Dynamic View Services > Specifying Dynamic View Types > Representation and Propagation Conditions > Representation Status

For each server runtime type, a runtime attribute rpStatus of type integer is implicitly declared by Rogue Wave® Server. A particular feature of this attribute is that its value is defined within the scope of each view. This means that an object can have a different representation status in different views. The representation status is very useful for controlling the way each object is notified in a view. For instance, in the CompanyTree view type, the representation status can be used to expand or shrink the tree for a given Department object:

view CompanyTree:

subscribe origin Company:

represent TreeR root:

string label=identifier;

propagate departments;

subscribe Department:

represent TreeItemR item:

Ref<TreeR> ownerTree=company->root;

string label=name;

propagate employees when (rpStatus==2);

subscribe Employee:

represent TreeItemR subItem:

Ref<TreeItemR> ownerItem=department->item;

string label=name;

By default, the representation status of a server object is:

0 if the view does not subscribe to this object

1 if it does.

This means that when opening a view CompanyTree, only the list of the departments making up the company appear in the tree. If you want to expand or shrink the tree for a given department, you must change the representation status of the department. One way to do this is to have the callback function TreeItemR::onSelection called when a double-click event occurs on the tree gadget item. This function uses a new data member defined by the user on TreeItemR to locally store the last representation status set.

After updating the status, the function IlsRpObject::setRpStatus is called, as shown in the code sample below:

void TreeItemR::onSelection()

{

_rpStatus=(_rpStatus==1)?2:1;

setRpStatus(_rpStatus);

}

Version 5.8