Java Reference
In-Depth Information
// Row One
constraints.gridy=0;
for (int i=0; i<3; i++) {
JButton button = new JButton("" + i);
constraints.gridx=i;
frame.add(button, constraints);
}
// Row Two
JPanel panel = new JPanel();
panel.setFocusCycleRoot(true);
panel.setFocusTraversalPolicyProvider(true);
panel.setLayout(new GridLayout(1,3));
for (int i=0; i<3; i++) {
JButton button = new JButton("" + (i+3));
panel.add(button);
}
constraints.gridx=0;
constraints.gridy=1;
constraints.gridwidth=3;
frame.add(panel, constraints);
// Row Three
constraints.gridy=2;
constraints.gridwidth=1;
for (int i=0; i<3; i++) {
JButton button = new JButton("" + (i+6));
constraints.gridx=i;
frame.add(button, constraints);
}
frame.setSize(300, 200);
frame.setVisible(true);
}
};
EventQueue.invokeLater(runner);
}
}
FocusTraversalPolicy Class
The
FocusTraversalPolicy
is responsible for determining the focus traversal order. It allows
you to specify the next and previous components in the order. This class offers six methods for
controlling traversal order:
