NodePresenter(VGraphExplorer parent, NodeProxy model) {
this.parent = parent;
this.model = model;
graph = parent.getGraph();
view.setTitle(model.getId());
Style style = view.getElement().getStyle();
style.setLeft(model.getX(), Unit.PX);
style.setTop(model.getY(), Unit.PX);
view.addDomHandler(this, MouseDownEvent.getType());
view.addDomHandler(this, MouseMoveEvent.getType());
view.addDomHandler(this, MouseUpEvent.getType());
parent.add(view);
}
private void limitToBoundingBox() {
Element element = view.getElement();
Style style = element.getStyle();
int width = element.getOffsetWidth();
model.setWidth(width);
int xRadius = width / 2;
int leftEdge = model.getX() - xRadius;
leftEdge = limit(0, leftEdge, parent.getOffsetWidth() - width);
model.setX(leftEdge + xRadius);
style.setLeft(leftEdge, Unit.PX);
int height = element.getOffsetHeight();
model.setHeight(height);
int yRadius = height / 2;
int topEdge = model.getY() - yRadius;
topEdge = limit(0, topEdge, parent.getOffsetHeight() - height);
model.setY(topEdge + yRadius);
style.setTop(topEdge, Unit.PX);
}
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();
}
public void onMouseMove(MouseMoveEvent event) {
if (isMouseDown()) {
setDragging(true);
updateCSS();
model.setX(event.getX() + model.getX() - dragStartX);
model.setY(event.getY() + model.getY() - dragStartY);
onUpdateInModel();
int clientX = event.getClientX();
int clientY = event.getClientY();
boolean outsideWindow =
clientX < 0
|| clientY < 0
|| clientX > Window.getClientWidth()
|| clientY > Window.getClientHeight();
if (outsideWindow) {
parent.save(model, true);
setDragging(false);
}
}
event.preventDefault();
}