JTextField在GridBagLayout中未对齐 [英] JTextField not aligning in GridBagLayout

问题描述

我刚刚开始使用GridBagLayout，下面的图像非常清楚地说明了问题，我需要前4行中的第一个JTextField一直延伸到JLabel就像右边的一样.

I've just started working with GridBagLayout, and the image below is pretty self-explanatory of the problem, I need the first JTextField of the first 4 rows to stretch all the way to the JLabel on the left, just like the right ones.

该组件从顶部到底部的网格宽度为:

The Component's grid widths, from top to bottom, are :

1、1、1、1

1、3

1、1、1、1

1、3

2，2

2，2

JFrame中GridBagConstraints设置的代码:

Code of the GridBagConstraints settings in the JFrame :

此外，为什么即使将anchor设置为"NORTH"，所有组件仍都位于JPanel的中心对齐?

    setLayout(new GridBagLayout());
    GridBagConstraints gbc = new GridBagConstraints();
    gbc.insets = new Insets(10, 10, 10, 10);

    labelNome = new JLabel("Nome:");
    gbc.gridx = 0;
    gbc.gridy = 0;
    gbc.fill = GridBagConstraints.BOTH;
    add(labelNome, gbc);

    tfNome = new JTextField();
    gbc.gridx = 1;
    gbc.ipadx = 50;
    gbc.fill = GridBagConstraints.HORIZONTAL;
    add(tfNome, gbc);

    labelIdade = new JLabel("Idade :");
    gbc.ipadx = 0;
    gbc.gridx = 2;
    gbc.fill = GridBagConstraints.BOTH;
    add(labelIdade, gbc);

    tfIdade = new JTextField();
    gbc.gridx = 3;
    gbc.ipadx = 50;
    gbc.fill = GridBagConstraints.HORIZONTAL;
    add(tfIdade, gbc);

    labelEndereco = new JLabel("Endereço :");
    gbc.ipadx = 50;
    gbc.gridx = 0;
    gbc.gridy = 1;
    gbc.fill = GridBagConstraints.BOTH;
    add(labelEndereco, gbc);

    tfEndereco = new JTextField();
    gbc.ipadx = 50;
    gbc.gridx = 1;
    gbc.gridwidth = 3;
    gbc.fill = GridBagConstraints.HORIZONTAL;
    add(tfEndereco, gbc);

    labelFiliacao = new JLabel("Filiação :");
    gbc.gridwidth = 1;
    gbc.gridx = 0;
    gbc.gridy = 2;
    gbc.fill = GridBagConstraints.BOTH;
    add(labelFiliacao, gbc);

    tfFiliacao = new JTextField();
    gbc.gridx = 1;
    gbc.ipadx = 50;
    gbc.fill = GridBagConstraints.HORIZONTAL;
    add(tfFiliacao, gbc);

    labelTurma = new JLabel("Turma :");
    gbc.ipadx = 0;
    gbc.gridx = 2;
    gbc.fill = GridBagConstraints.BOTH;
    add(labelTurma, gbc);

    tfTurma = new JTextField();
    gbc.gridx = 3;
    gbc.ipadx = 50;
    gbc.fill = GridBagConstraints.HORIZONTAL;
    add(tfTurma, gbc);

    labelDisciplina = new JLabel("Disciplina :");
    gbc.ipadx = 0;
    gbc.gridx = 0;
    gbc.gridy = 3;
    gbc.fill = GridBagConstraints.BOTH;
    add(labelDisciplina, gbc);

    tfDisciplina = new JTextField();
    gbc.gridwidth = 1;
    gbc.ipadx = 50;
    gbc.ipady = 0;
    gbc.gridx = 1;
    gbc.gridwidth = 3;
    gbc.fill = GridBagConstraints.HORIZONTAL;
    add(tfDisciplina, gbc);

    adicionaDisciplina = new JButton("Adicionar disciplina");
    gbc.gridwidth = 2;
    gbc.gridx = 0;
    gbc.gridy = 4;
    gbc.fill = GridBagConstraints.NONE;
    add(adicionaDisciplina, gbc);

    limparDisciplina = new JButton("Limpar lista de disciplinas");
    gbc.gridx = 2;
    add(limparDisciplina, gbc);

    botaoSalvar = new JButton("Salvar");
    gbc.gridx = 0;
    gbc.gridy = 5;
    add(botaoSalvar, gbc);

    botaoCancelar = new JButton("Cancelar");
    gbc.gridx = 2;
    add(botaoCancelar, gbc);

推荐答案

import java.awt.*;
import javax.swing.*;
class example extends JFrame
{
    public example()
    {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new GridBagLayout());
setSize(800,800);
    GridBagConstraints gbc = new GridBagConstraints();
    gbc.insets = new Insets(10, 10, 10, 10);

    JLabel labelNome = new JLabel("Nome:");
    gbc.gridx = 0;
    gbc.gridy = 0;
    gbc.fill = GridBagConstraints.BOTH;
    add(labelNome, gbc);

    JTextField tfNome = new JTextField();
    gbc.gridx = 1;
    gbc.ipadx = 50;
    gbc.fill = GridBagConstraints.HORIZONTAL;
    add(tfNome, gbc);

    JLabel labelIdade = new JLabel("Idade :");
    gbc.ipadx = 0;
    gbc.gridx = 2;
    gbc.fill = GridBagConstraints.BOTH;
    add(labelIdade, gbc);

    JTextField tfIdade = new JTextField();
    gbc.gridx = 3;
    gbc.ipadx = 50;
    gbc.fill = GridBagConstraints.HORIZONTAL;
    add(tfIdade, gbc);

    JLabel labelEndereco = new JLabel("Endereço :");
    gbc.ipadx = 50;
    gbc.gridx = 0;
    gbc.gridy = 1;
    gbc.fill = GridBagConstraints.BOTH;
    add(labelEndereco, gbc);

    JTextField tfEndereco = new JTextField();
    gbc.ipadx = 50;
    gbc.gridx = 1;
    gbc.gridwidth = 3;
    gbc.fill = GridBagConstraints.HORIZONTAL;
    add(tfEndereco, gbc);

    JLabel labelFiliacao = new JLabel("Filiação :");
    gbc.gridwidth = 1;
    gbc.gridx = 0;
    gbc.gridy = 2;
    gbc.fill = GridBagConstraints.BOTH;
    add(labelFiliacao, gbc);

    JTextField tfFiliacao = new JTextField();
    gbc.gridx = 1;
    gbc.ipadx = 50;
    gbc.fill = GridBagConstraints.HORIZONTAL;
    add(tfFiliacao, gbc);

    JLabel labelTurma = new JLabel("Turma :");
    gbc.ipadx = 0;
    gbc.gridx = 2;
    gbc.fill = GridBagConstraints.BOTH;
    add(labelTurma, gbc);

    JTextField tfTurma = new JTextField();
    gbc.gridx = 3;
    gbc.ipadx = 50;
    gbc.fill = GridBagConstraints.HORIZONTAL;
    add(tfTurma, gbc);

    JLabel labelDisciplina = new JLabel("Disciplina :");
    gbc.ipadx = 0;
    gbc.gridx = 0;
    gbc.gridy = 3;
    gbc.fill = GridBagConstraints.BOTH;
    add(labelDisciplina, gbc);

    JTextField tfDisciplina = new JTextField();
    gbc.gridwidth = 1;
    gbc.ipadx = 50;
    gbc.ipady = 0;
    gbc.gridx = 1;
    gbc.gridwidth = 3;
    gbc.fill = GridBagConstraints.HORIZONTAL;
    add(tfDisciplina, gbc);

    JButton adicionaDisciplina = new JButton("Adicionar disciplina");
    gbc.gridwidth = 2;
    gbc.gridx = 0;
    gbc.gridy = 4;
    gbc.fill = GridBagConstraints.NONE;
    add(adicionaDisciplina, gbc);

    JButton limparDisciplina = new JButton("Limpar lista de disciplinas");
    gbc.gridx = 2;
    add(limparDisciplina, gbc);

    JButton botaoSalvar = new JButton("Salvar");
    gbc.gridx = 0;
    gbc.gridy = 5;
    add(botaoSalvar, gbc);

    JButton botaoCancelar = new JButton("Cancelar");
    gbc.gridx = 2;
    add(botaoCancelar, gbc);

    setVisible(true);
    }
    public static void main(String aaa[]){new example();}
    }

使用此代码

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