@Nullable
private GraphElement overCell(MouseEvent e) {
int y = PositionUtil.getYInsideRow(e);
int x = e.getX();
GraphPrintCell row = getGraphPrintCell(e);
return row != null ? myGraphPainter.mouseOver(row, x, y) : null;
}
@Nullable
private Node arrowToNode(MouseEvent e) {
int y = PositionUtil.getYInsideRow(e);
int x = e.getX();
GraphPrintCell row = getGraphPrintCell(e);
if (row == null) {
return null;
}
SpecialPrintElement printElement = myGraphPainter.mouseOverArrow(row, x, y);
if (printElement == null) {
return null;
}
Edge edge = printElement.getGraphElement().getEdge();
if (edge == null) {
return null;
}
return printElement.getType() == SpecialPrintElement.Type.DOWN_ARROW
? edge.getDownNode()
: edge.getUpNode();
}