Java Swing GridBagLayout spazio a sinistra
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27-10-2019 - |
Domanda
mi sono bloccato con Java GridBagLayout. Qui è solo un problema di sinistra. Voglio che il pannello centrale ( "Test Etichetta 2") prendere tutti gli spazi verticali a sinistra.
Come raggiungere questo obiettivo?
Grazie.
package com;
import java.awt.Color;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.LineBorder;
import javax.swing.border.TitledBorder;
public class Test1 {
private void _panel1(JPanel panel){
panel.setBorder(new LineBorder(Color.RED));
panel.setLayout(new GridBagLayout());
JPanel panel1 = new JPanel();
panel1.add(new JLabel(" Testing Label 1 "));
panel1.setBorder(new TitledBorder("P1"));
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.anchor = GridBagConstraints.NORTH;
c.gridx = 0;
c.gridy = 0;
c.weightx = 1.0;
c.weighty = 0.0;
panel.add(panel1, c);
JPanel panel2 = new JPanel();
panel2.add(new JLabel(" Testing Label 2"));
panel2.setBorder(new TitledBorder("P2"));
c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.anchor = GridBagConstraints.NORTH;
c.gridx = 0;
c.gridy = 1;
c.weightx = 1.0;
c.weighty = 1.0;
panel.add(panel2, c);
JPanel panel3 = new JPanel();
panel3.setBorder(new TitledBorder("P3"));
c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.anchor = GridBagConstraints.NORTH;
c.gridx = 0;
c.gridy = 2;
c.weightx = 1.0;
c.weighty = 0.0;
panel3.setLayout(new GridLayout(5,1));
for(int i=0; i<5; i++){
panel3.add(new JButton("button "+i));
}
panel.add(panel3, c);
}
public Test1(){
JFrame frame = new JFrame();
frame.setTitle("test 1");
frame.getContentPane().setLayout(new GridLayout(1,3));
JPanel panel1 = new JPanel();
_panel1(panel1);
JPanel panel2 = new JPanel();
JPanel panel3 = new JPanel();
frame.getContentPane().add(panel1);
frame.getContentPane().add(panel2);
frame.getContentPane().add(panel3);
frame.setSize(800, 600);
frame.setVisible(true);
}
public static void main(String[] args) {
Test1 t = new Test1();
}
}
Soluzione
Ho appena cambiato una linea (27):
final JPanel panel2 = new JPanel();
panel2.add(new JLabel(" Testing Label 2"));
panel2.setBorder(new TitledBorder("P2"));
c = new GridBagConstraints();
// You have to use BOTH for the panel to take
// all vertical and horizontal space
c.fill = GridBagConstraints.BOTH;
Si stavano mettendo il vincolo griglia per panel2
a HORIZONTAL
.
Saluti,
Altri suggerimenti
Si consiglia di modificare campo di riempimento del GridBagConstraint per sia per panel2:
panel2.setBorder(new TitledBorder("P2"));
c = new GridBagConstraints();
c.fill = GridBagConstraints.BOTH; // *****
c.anchor = GridBagConstraints.NORTH;
Uno che o per una soluzione molto più semplice, basta usare un BorderLayout invece:
panel.setBorder(new LineBorder(Color.RED));
panel.setLayout(new BorderLayout());
JPanel panel1 = new JPanel();
panel1.add(new JLabel(" Testing Label 1 "));
panel1.setBorder(new TitledBorder("P1"));
panel.add(panel1, BorderLayout.NORTH);
JPanel panel2 = new JPanel();
panel2.add(new JLabel(" Testing Label 2"));
panel2.setBorder(new TitledBorder("P2"));
panel.add(panel2, BorderLayout.CENTER);
JPanel panel3 = new JPanel();
panel3.setBorder(new TitledBorder("P3"));
panel3.setLayout(new GridLayout(5, 1));
for (int i = 0; i < 5; i++) {
panel3.add(new JButton("button " + i));
}
panel.add(panel3, BorderLayout.SOUTH);
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