public void onMouseDown(MouseDownEvent event) {
setMouseDown(true);
updateCSS();
DOM.setCapture(view.getElement());
dragStartX = event.getX();
dragStartY = event.getY();
event.preventDefault();
}
public void onMouseUp(MouseUpEvent event) {
Element element = view.getElement();
if (!isDragging()) {
updateCSS();
limitToBoundingBox();
if (NodeProxy.EXPANDED.equals(model.getState())) {
model.setState(NodeProxy.COLLAPSED);
for (NodeProxy neighbor : graph.getNeighbors(model)) {
boolean collapsed = NodeProxy.COLLAPSED.equals(neighbor.getState());
boolean leafNode = graph.degree(neighbor) == 1;
if (collapsed && leafNode) {
graph.removeNode(neighbor);
}
}
}
parent.toggle(model);
} else {
parent.save(model, true);
setDragging(false);
}
setMouseDown(false);
DOM.releaseCapture(element);
event.preventDefault();
}