I have a table. If I right-click I got a JPopUpMenu but before the pop-up I want to select the row where the right-click event is done. Here is what I’ve tried.
path_tbl.addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
System.out.println(e.getPoint());
Point point = e.getPoint();
int selectedRow = path_tbl.rowAtPoint(point);
path_tbl.setRowSelectionInterval(selectedRow, selectedRow);
}
});
In that event, I cannot get any output from the console when I right-click. However, when I left-click, points are printed to the console.
java.awt.Point[x=105,y=76]
So, this event only works when I left-click. How can I make this event work with right-click?
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Answer
Since you want custom mouse behavior, you should not use setComponentPopupMenu.
Instead, display the JPopupMenu yourself, using JPopupMenu’s show method:
JPopupMenu menu = /* ... */;
path_tbl.addMouseListener(new MouseAdapter() {
private void showPopupMenuFor(MouseEvent e) {
if (menu.isPopupTrigger(e)) {
Point point = e.getPoint();
int row = path_tbl.rowAtPoint(point);
if (!path_tbl.isRowSelected(row)) {
path_tbl.setRowSelectionInterval(row, row);
}
menu.show(path_tbl, e.getX(), e.getY());
}
}
@Override
public void mousePressed(MouseEvent e) {
showPopupMenuFor(e);
}
@Override
public void mouseReleased(MouseEvent e) {
showPopupMenuFor(e);
}
@Override
public void mouseClicked(MouseEvent e) {
showPopupMenuFor(e);
}
});
You must check the MouseEvent in both mousePressed and mouseReleased, because exactly when a context menu is triggered depends on the platform and the look-and-feel. (Checking in mouseClicked may or may not be necessary, but it doesn’t hurt.)