/** @see javax.swing.Action#isEnabled() */
public boolean isEnabled() {
Object target = TargetManager.getInstance().getTarget();
ArgoDiagram dia = ProjectManager.getManager().getCurrentProject().getActiveDiagram();
if (dia == null) return false;
MutableGraphModel gm = (MutableGraphModel) dia.getGraphModel();
return gm.canAddNode(target);
}
/**
* selects a diagram without affecting the gui.
*
* @param diagram the diagram
*/
public void setCurrentDiagram(ArgoDiagram diagram) {
if (diagram == null) {
throw new RuntimeException("you can't select a null diagram");
}
currentGM = (ClassDiagramGraphModel) diagram.getGraphModel();
currentLayer = diagram.getLayer();
currentDiagram = diagram;
markDiagramAsModified(diagram);
}