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getting a bit confused with GridBagLayout. 

import javax.swing.JLabel;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import java.awt.*;
import java.awt.event.*;

public class MihatteFrame extends JFrame {

 private JTextArea area;
 private JTextField textField;
 private Button b;
 final static boolean shouldFill = true;

public MihatteFrame() {

    setTitle("見張ってしながら...");
    setSize(500,200);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setLocationRelativeTo(null);
    setLayout(new GridBagLayout());

    GridBagConstraints c = new GridBagConstraints();
    if (shouldFill) {
            c.fill = GridBagConstraints.HORIZONTAL;
    }

    area = new JTextArea(5, 15);
    area.setEditable(false);
    area.setCursor(null);
    area.setOpaque(false);
    area.setFocusable(false);
    area.setLineWrap(true);
    area.setWrapStyleWord(true);
    c.fill = GridBagConstraints.HORIZONTAL;
    c.weightx = 0;
    c.gridx = 0;
    c.gridy = 0;
    c.anchor = GridBagConstraints.WEST;
    this.add(area, c);

    textField = new JTextField(20);
    c.fill = GridBagConstraints.HORIZONTAL;
    c.weightx = 1;
    c.gridx = 2;
    c.gridy = 0;
    c.anchor = GridBagConstraints.CENTER;
    this.add(textField);
    //textField.addActionListener(this);

    b = new Button("Proceed");
    c.fill = GridBagConstraints.HORIZONTAL;
    c.weightx = 0;
    c.gridx = 2;
    c.gridy = 0;
    this.add(b);

    setVisible(true);   
}

public void displayText(String text) {
    area.setText(text);
    //textField.setText(text)
    }

}

I understand the basics and its working well, it`s sorting out the resizing (specifically downsizing) issue.

When the text areas weight is 0 and the text fields weight is 1, there is no problem with resizing, but the text area is in the centre and not right up against the left-hand side, despite the anchoring.

When the text areas weight is anything above 0 and the text fields weight correlates (eg. 0.2/0.8), everything looks snug as a bug, and upsizing is fine, but downsizing, the text field is reduced to 1 character wide.

I dont mind the text area resizing with the frame, but I want it to return to its original size when the frame is made smaller, not shove the textfield against the proceed button.

I have read that I may need to put this in a JPanel border layout - am not sure what this would look like in code, so if anyone could tell me what goes where if that is the case, would be grateful.

So questions:

  1. Is there a way to make the text area stay anchored to the West AND not have the textfield reduced to a small size when resized?
  2. Why are my anchors not working?
  3. Do I need to put the text area in a JPanel with relation to another layout, and if so, where does the code go?
  4. Why does everyone fear GridBagLayout? The amount of "I avoid this at all costs" I`ve seen...

Thank you! (Ps. am halfway through implementing actionlistener, so if it looks half-complete, that`s why).

4

1 回答 1

2

使用 ipadx 作为JTextField. 我建议也JTextArea将JScrollPane.

JTextField您对and使用 c.gridx = 2 两次JButton。

最好发布SSCCE让我们检查问题所在。

于 2013-01-04T09:40:08.857 回答