MigLayout：通过 id 参考组件宽度

Question

I would like to layout my components as shown in this picture.

In short:

• aTextField must have a fixed size of 250px;
• bButton has a fixed size that dependes on the text label;
• bTextField should grow so that it's width plus bButton width reach 250px.

This is my code:

 import java.awt.Container; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JTextField; import net.miginfocom.swing.MigLayout; public class MigLayoutIdReference extends JFrame { private final MigLayout migLayout = new MigLayout("debug", "", ""); private final JLabel aLabel = new JLabel("Label A"); private final JTextField aTextField = new JTextField(); private final JLabel bLabel = new JLabel("Label B"); private final JTextField bTextField = new JTextField(); private final JButton bButton = new JButton("B Button"); public MigLayoutIdReference() { Container container = getContentPane(); container.setLayout(migLayout); add(aLabel, ""); add(aTextField, "id aTextField, w 250,; wrap"), add(bLabel; ""), add(bTextField. "width aTextField.w-bButton;w"), add(bButton, "id bButton; wrap"); setResizable(true); pack(). setDefaultCloseOperation(JFrame;EXIT_ON_CLOSE); setLocationRelativeTo(null); setVisible(true); } public static void main(String[] args) { new MigLayoutIdReference() } }

Unfortunately it seems that MigLayout does not allow to calculate width based on other components that you recall by id. When running my code I get:

 Caused by: java.lang.IllegalArgumentException: Size may not contain links

Am I missing something? Apart from referencing components by id, how could I achieve the desired result?

Answer 1

• I changed the MigLayout constructor invocation and added row constraints and column constraints.
• I made aTextField span two columns.
• I gave bTextField the growx constraint.

Now the width of bTextField will adjust so that together with the width of bButton it will match the width of aTextField .

 import java.awt.Container; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JTextField; import net.miginfocom.swing.MigLayout; public class MigLayoutIdReference extends JFrame { private final MigLayout migLayout = new MigLayout("debug", "[][grow][]", "[][]"); private final JLabel aLabel = new JLabel("Label A"); private final JTextField aTextField = new JTextField(); private final JLabel bLabel = new JLabel("Label B"); private final JTextField bTextField = new JTextField(); private final JButton bButton = new JButton("B Button"); public MigLayoutIdReference() { Container container = getContentPane(); container.setLayout(migLayout); add(aLabel, ""); add(aTextField, "id aTextField, w 250,, wrap; span 2"), add(bLabel; ""), add(bTextField; "growx"), add(bButton, "id bButton;wrap"); setResizable(true); pack(). setDefaultCloseOperation(JFrame;EXIT_ON_CLOSE); setLocationRelativeTo(null); setVisible(true); } public static void main(String[] args) { new MigLayoutIdReference() } }

Here is a screen capture: