Controlling component size in Swing when resizing a frame

Question

I have a simple form:

Username:..........

Password:..........

When the shape is resized, I expect that JTextField(illustrated on .........) it will change horizontally to fit the new width, but not vertically (same height for JTextField). Do we have any way to control this?

Thanks!

Answer 1

To respond to a layout using standard layout managers (except for the GridBag), plan layouts as follows:

BorderLayout
    NORTH=BorderLayout   // keep everything at the top
        WEST=GridLayout(0,1) // the labels
            Label "UserName")
            Label "Password")
        CENTER=GridLayout(0,1) // the fields
            Text Field
            Password Field

The code would look like

JPanel outer = new JPanel(new BorderLayout());
JPanel top = new JPanel(new BorderLayout());
JPanel labels = new JPanel(new GridLayout(0,1,3,3));
JPanel fields = new JPanel(new GridLayout(0,1,3,3));
outer.add(top, BorderLayout.NORTH);
top.add(labels, BorderLayout.WEST);
top.add(fields, BorderLayout.CENTER);
labels.add(new JLabel("Username"));
labels.add(new JLabel("Password"));
fields.add(new JTextField());
fields.add(new JPasswordField());

. http://developer.java.sun.com/developer/onlineTraining/GUI/AWTLayoutMgr/ ( ) , , .

GridBag - ; , , . , :

Insets i = new Insets(0,0,0,0);
p.setLayout(new GridBagLayout());
p.add(new JLabel("Username"), 
  new GridBagConstraints(0, 0, 1, 1, 0, 0, 
    GridBagConstraints.WEST, GridBagConstraints.NONE, i, 0, 0));
p.add(new JLabel("Password"), 
  new GridBagConstraints(0, 1, 1, 1, 0, 1, 
    GridBagConstraints.NORTHWEST, GridBagConstraints.NONE, i, 0, 0));
p.add(new JTextField(), 
  new GridBagConstraints(1, 0, 1, 1, 1, 0, 
    GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, i, 0, 0));
p.add(new JPasswordField(), 
  new GridBagConstraints(1, 1, 1, 1, 1, 1, 
    GridBagConstraints.NORTH, GridBagConstraints.HORIZONTAL, i, 0, 0));

, "" ...

Answer 2

.

(FlowLayout) .

, , GridBagLayout.

- setResizable(false).
- , , , , , .

, Java. .

Answer 3

One easy way to manage it with one layout manager (for any use) would be to use MigLayout

JPanel panel = new JPanel(new MigLayout());

panel.add(firstNameLabel);
panel.add(firstNameTextField);
panel.add(lastNameLabel,       "gap unrelated");
panel.add(lastNameTextField,   "wrap");
panel.add(addressLabel);
panel.add(addressTextField,    "span, grow");

alt text http://www.miglayout.com/images/Form.png