@Override
public void activate() {
super.activate();
// register for change notifications regarding hidden nodes
HidingModel hidingModel = getHidingModel();
hidingModel.addPropertyChangeListener(hidingModelListener);
}
@Override
public IStatus execute(IProgressMonitor monitor, IAdaptable info) throws ExecutionException {
// save the graph nodes that are removed from the hiding model
shownNeighbors.clear();
Set<NodeContentPart> hiddenNeighbors = hidingModel.getHiddenNeighborParts(nodePart);
if (hiddenNeighbors != null && !hiddenNeighbors.isEmpty()) {
for (NodeContentPart neighborPart : hiddenNeighbors) {
neighborPart.activate();
hidingModel.show(neighborPart);
shownNeighbors.add(neighborPart);
}
}
return Status.OK_STATUS;
}
@Override
public IStatus undo(IProgressMonitor monitor, IAdaptable info) throws ExecutionException {
for (NodeContentPart neighborPart : shownNeighbors) {
hidingModel.hide(neighborPart);
neighborPart.deactivate();
}
return Status.OK_STATUS;
}
@Override
public void deactivate() {
HidingModel hidingModel = getHidingModel();
hidingModel.removePropertyChangeListener(hidingModelListener);
super.deactivate();
}
@Override
public boolean isNoOp() {
Set<NodeContentPart> hiddenNeighbors = hidingModel.getHiddenNeighborParts(nodePart);
return hiddenNeighbors != null && !hiddenNeighbors.isEmpty();
}