Subclassing view interactors
You can subclass the
IlvMakeSDMNodeInteractor and the
IlvMakeSDMLinkInteractor to control when a link is created between two nodes, or to perform custom actions when links or nodes are created.
For example, to create a link only between certain types of node, you can subclass IlvMakeSDMLinkInteractor and override the acceptOrigin and acceptDestination methods, see the following code example:
Subclassing the IlvMakeSDMLinkInteractor
public class ValidatingLinkInteractor extends IlvMakeSDMLinkInteractor
{
protected boolean acceptOrigin(IlvPoint p, IlvGraphic fromNode) {
Object o = getEngine().getObject(fromNode);
if("false".equals(getEngine().getModel().getObjectProperty(o, "okForOrigin")))
return false;
return super.acceptOrigin(p, fromNode);
}
protected boolean acceptDestination(IlvPoint p, IlvGraphic toNode) {
Object o = getEngine().getObject(toNode);
if("false".equals(getEngine().getModel().getObjectProperty(o, "okForDestination")))
return false;
return super.acceptDestination(p, toNode);
}
}
In this example, a node whose property "okForOrigin" is false is not accepted as the origin of a link, and a node whose property "okForDestination" is false is not accepted as the destination of a link.
You can also set custom properties when a node or a link is created by overriding setNodeProperties or setLinkProperties. For example, to prompt the user for the "name" property of a node as it is created, you can subclass IlvMakeSDMNodeInteractor and override setNodePorperties as follows:
Subclassing the IlvMakeSDMNodeInteractor
public class PromptingNodeInteractor extends IlvMakeSDMNodeInteractor
{
protected void setNodeProperties(IlvSDMModel model, Object node) {
String label = JOptionPane.showInputDialog(getManagerView(), "Name:");
if(label != null)
model.setObjectProperty(node, "name", label);
}
}
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