我正在尝试制作一个表单，dataIn面板将具有一个标签，其后是其各自的文本字段，供用户输入数据。
所以我发现GridBagLayout是最好的方法，但是我还真的不知道如何使用它。
到目前为止，这是结果。我的整个表单是BorderLayout，但是我们只关注其北部，用户将在其中输入数据。
该北部容器包含一个具有4行2列的GridLayout。
在此GridLayout的（0,0）内部，我创建了另一个带有GridBagLayout的面板，并带有JLabel和JTextfield。这个容器的想法是响应性的，并填充现在显示为灰色的整个剩余区域，我希望所有这些都成为文本字段。
如果有人可以帮助我学习如何使用GridBagLayout做到这一点，我将不胜感激。我知道我在做什么可能不是最佳选择，所以我会听取更好的建议。
谢谢。
import java.awt.*;
import javax.swing.*;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellRenderer;
import java.awt.Insets;
import java.awt.event.*;
@SuppressWarnings("serial")
public class UserForm extends JFrame {
public UserForm() {
// Miscelaneous
Font font0 = new Font("Tahoma", Font.PLAIN, 12);
Font font1 = new Font("Tahoma", Font.BOLD, 11);
Font font2 = new Font("Tahoma", Font.BOLD, 12);
// Frame layout -> north: data-in form, center: Jtable displayed, south:
// buttons.
JPanel mainP = new JPanel(new BorderLayout(5, 25));
JPanel dataIn = new JPanel(new GridLayout(4, 2, 60, 3));
JPanel displayT = new JPanel(new BorderLayout(0, 20));
JPanel buttons = new JPanel(new GridLayout(0, 3, 10, 5));
// Data-In Form Components
JLabel idl = new JLabel("Id:");
JLabel namel = new JLabel("Name:");
JLabel ln1l = new JLabel("First Lastname:");
JLabel ln2l = new JLabel("Second Lastname:");
JLabel agl = new JLabel("Age:");
JLabel adl = new JLabel("Address:");
JLabel pnl = new JLabel("Phone Number:");
JLabel eml = new JLabel("E-Mail:");
JTextField idtf = new JTextField("");
JTextField nametf = new JTextField("");
JTextField ln1tf = new JTextField("");
JTextField ln2tf = new JTextField("");
JTextField agtf = new JTextField("");
JTextField adtf = new JTextField("");
JTextField pntf = new JTextField("");
JTextField emtf = new JTextField("");
// Data-In Form Containers
JPanel dataId = new JPanel(new GridBagLayout());
JPanel dataName = new JPanel(new GridBagLayout());
JPanel dataLN1 = new JPanel(new GridBagLayout());
JPanel dataLN2 = new JPanel(new GridBagLayout());
JPanel dataAg = new JPanel(new GridBagLayout());
JPanel dataAd = new JPanel(new GridBagLayout());
JPanel dataPN = new JPanel(new GridBagLayout());
JPanel dataEM = new JPanel(new GridBagLayout());
// Components into individual containers
// GridBagLayout Constraints label
GridBagConstraints c1 = new GridBagConstraints();
c1.gridx = 0;
c1.gridy = 0;
c1.gridwidth = 1;
c1.gridheight = 1;
c1.weightx = 0.5;
c1.anchor = GridBagConstraints.FIRST_LINE_START;
c1.insets = new Insets(3,10,0,0);
// GridBagLayout Constraints tf
GridBagConstraints c2 = new GridBagConstraints();
c2.gridx = 1;
c2.gridy = 0;
//c2.gridwidth = 4;
c2.gridheight = 1;
c2.weightx = 0.5;
c2.anchor = GridBagConstraints.WEST;
c2.insets = new Insets(3,0,0,10);
c2.fill = GridBagConstraints.HORIZONTAL;
dataId.add(idl, c1);
dataId.add(idtf, c2);
dataName.add(namel, c1);
dataName.add(nametf, c2);
dataLN1.add(ln1l, c1);
dataLN1.add(ln1tf, c2);
dataLN2.add(ln2l, c1);
dataLN2.add(ln2tf, c2);
dataAg.add(agl, c1);
dataAg.add(agtf, c2);
dataAd.add(adl, c1);
dataAd.add(adtf, c2);
dataPN.add(pnl, c1);
dataPN.add(pntf, c2);
dataEM.add(eml, c1);
dataEM.add(emtf, c2);
// Miscelaneous
idl.setFont(font2);
idtf.setFont(font0);
namel.setFont(font2);
nametf.setFont(font0);
ln1l.setFont(font2);
ln1tf.setFont(font0);
ln2l.setFont(font2);
ln2tf.setFont(font0);
agl.setFont(font2);
agtf.setFont(font0);
adl.setFont(font2);
adtf.setFont(font0);
pnl.setFont(font2);
pntf.setFont(font0);
eml.setFont(font2);
emtf.setFont(font0);
// Set tf editable
idtf.setEditable(true);
nametf.setEditable(true);
ln1tf.setEditable(true);
ln2tf.setEditable(true);
agtf.setEditable(true);
adtf.setEditable(true);
pntf.setEditable(true);
emtf.setEditable(true);
dataIn.add(dataId);
dataIn.add(dataAg);
dataIn.add(dataName);
dataIn.add(dataAd);
dataIn.add(dataLN1);
dataIn.add(dataPN);
dataIn.add(dataLN2);
dataIn.add(dataEM);
// JTable Creation
String[] headline = { "Id", "Name", "First Lastname", "Second Lastname", "Age", "Address", "Phone Number",
"E-Mail" };
String[][] data = { { "", "", "", "", "", "", "", "" }, { "", "", "", "", "", "", "", "" } };
JTable dataShow = new JTable(data, headline);
// Table Personalization
dataShow.getTableHeader().setFont(font1);
new HeaderRenderer(dataShow);
// Add to container
JPanel tableP = new JPanel(new BorderLayout(1, 1));
tableP.add(dataShow.getTableHeader(), BorderLayout.NORTH);
tableP.add(dataShow, BorderLayout.CENTER);
JScrollPane sP = new JScrollPane();
sP.setViewportView(tableP);
displayT.add(sP, BorderLayout.CENTER);
// buttons Components and Cointainers
JButton save = new JButton("Save");
JButton del = new JButton("Delete");
JButton edit = new JButton("Edit");
JLabel empty = new JLabel("");
// Add to button panel
buttons.add(save);
buttons.add(del);
buttons.add(edit);
buttons.add(empty);
// Miscelaneous
save.setFont(font2);
del.setFont(font2);
edit.setFont(font2);
// Add subpanels to main panel
mainP.add(dataIn, BorderLayout.NORTH);
mainP.add(displayT, BorderLayout.CENTER);
mainP.add(buttons, BorderLayout.SOUTH);
// set content pane
setContentPane(mainP);
setVisible(true);
setTitle("User Form");
setSize(900, 500);
setResizable(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// For future table filling
/*
* String ids = idtf.getText(); String names = nametf.getText(); String ln1s =
* ln1tf.getText(); String ln2s = ln2tf.getText(); String ags = agtf.getText();
* String ads = adtf.getText(); String pns = pntf.getText(); String ems =
* emtf.getText();
*/
}
public static void main(String[] args) {
// invoke runnable for thread safety
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new UserForm();
}
});
}
// LEFT alignment renderer
private class HeaderRenderer implements TableCellRenderer {
DefaultTableCellRenderer renderer;
public HeaderRenderer(JTable table) {
renderer = (DefaultTableCellRenderer) table.getTableHeader().getDefaultRenderer();
renderer.setHorizontalAlignment(JLabel.LEFT);
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,
int row, int col) {
return renderer.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, col);
}
}
}
最佳答案
这是我使用网格袋布局创建的GUI。
这是我所做的主要更改。
我使用了一个JFrame。除非您要覆盖其中一个类方法，否则没有理由扩展Swing组件。
我按正确的顺序排列了JFrame方法。必须按照我在代码中放入的顺序调用JFrame方法。
我将每个JComponent的所有JComponent方法归为一组，并按照它们在JFrame上出现的顺序创建了JComponent。为了热爱所有开发人员，请始终按行，列顺序创建JComponents。
我删除了所有大小调整，但JTable的首选视点大小除外。
我为每个JComponent定义了网格袋约束。这样，您可以调整每个JComponent的约束。此外，我不记得默认值。
此GUI中有两个JPanel。主JPanel包含除JButton之外的所有JComponent。第二个JPanel包含JButton。这是因为有3个按钮，我将网格袋布局分为4列。
网格袋布局使用4列。 JTable占据所有4列，以及按钮JPanel占据。
这是代码。
package com.ggl.testing;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellRenderer;
public class UserForm {
// top, left, bottom, right
private static final Insets topInsets = new Insets(10, 10, 10, 10);
private static final Insets topCenterInsets = new Insets(10, 0, 10, 10);
private static final Insets middleInsets = new Insets(0, 10, 10, 10);
private static final Insets middleCenterInsets = new Insets(0, 0, 10, 10);
public UserForm() {
JFrame frame = new JFrame("User Form");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Miscelaneous
Font plain = new Font("Tahoma", Font.PLAIN, 12);
Font bold11 = new Font("Tahoma", Font.BOLD, 11);
Font bold12 = new Font("Tahoma", Font.BOLD, 12);
JPanel mainPanel = new JPanel();
mainPanel.setLayout(new GridBagLayout());
int gridy = 0;
// Data-In Form Components
JLabel idl = new JLabel("Id:");
idl.setFont(bold12);
addComponent(mainPanel, idl, 0, gridy, 1, 1, topInsets, GridBagConstraints.LINE_START,
GridBagConstraints.NONE);
JTextField idtf = new JTextField(40);
idtf.setFont(plain);
addComponent(mainPanel, idtf, 1, gridy, 1, 1, topCenterInsets, GridBagConstraints.LINE_START,
GridBagConstraints.HORIZONTAL);
JLabel agl = new JLabel("Age:");
agl.setFont(bold12);
addComponent(mainPanel, agl, 2, gridy, 1, 1, topCenterInsets, GridBagConstraints.LINE_START,
GridBagConstraints.NONE);
JTextField agtf = new JTextField(40);
agtf.setFont(plain);
addComponent(mainPanel, agtf, 3, gridy++, 1, 1, topCenterInsets, GridBagConstraints.LINE_START,
GridBagConstraints.HORIZONTAL);
JLabel namel = new JLabel("Name:");
namel.setFont(bold12);
addComponent(mainPanel, namel, 0, gridy, 1, 1, middleInsets, GridBagConstraints.LINE_START,
GridBagConstraints.NONE);
JTextField nametf = new JTextField(40);
nametf.setFont(plain);
addComponent(mainPanel, nametf, 1, gridy, 1, 1, middleCenterInsets, GridBagConstraints.LINE_START,
GridBagConstraints.HORIZONTAL);
JLabel adl = new JLabel("Address:");
adl.setFont(bold12);
addComponent(mainPanel, adl, 2, gridy, 1, 1, middleCenterInsets, GridBagConstraints.LINE_START,
GridBagConstraints.NONE);
JTextField adtf = new JTextField(40);
adtf.setFont(plain);
addComponent(mainPanel, adtf, 3, gridy++, 1, 1, middleCenterInsets, GridBagConstraints.LINE_START,
GridBagConstraints.HORIZONTAL);
JLabel pnl = new JLabel("Phone Number:");
pnl.setFont(bold12);
addComponent(mainPanel, pnl, 0, gridy, 1, 1, middleInsets, GridBagConstraints.LINE_START,
GridBagConstraints.NONE);
JTextField pntf = new JTextField(40);
pntf.setFont(plain);
addComponent(mainPanel, pntf, 1, gridy, 1, 1, middleCenterInsets, GridBagConstraints.LINE_START,
GridBagConstraints.HORIZONTAL);
JLabel ln1l = new JLabel("First Lastname:");
ln1l.setFont(bold12);
addComponent(mainPanel, ln1l, 2, gridy, 1, 1, middleCenterInsets, GridBagConstraints.LINE_START,
GridBagConstraints.NONE);
JTextField ln1tf = new JTextField(40);
ln1tf.setFont(plain);
addComponent(mainPanel, ln1tf, 3, gridy++, 1, 1, middleCenterInsets, GridBagConstraints.LINE_START,
GridBagConstraints.HORIZONTAL);
JLabel ln2l = new JLabel("Second Lastname:");
ln2l.setFont(bold12);
addComponent(mainPanel, ln2l, 0, gridy, 1, 1, middleInsets, GridBagConstraints.LINE_START,
GridBagConstraints.NONE);
JTextField ln2tf = new JTextField(40);
ln2tf.setFont(plain);
addComponent(mainPanel, ln2tf, 1, gridy, 1, 1, middleCenterInsets, GridBagConstraints.LINE_START,
GridBagConstraints.HORIZONTAL);
JLabel eml = new JLabel("E-Mail:");
eml.setFont(bold12);
addComponent(mainPanel, eml, 2, gridy, 1, 1, middleCenterInsets, GridBagConstraints.LINE_START,
GridBagConstraints.NONE);
JTextField emtf = new JTextField(40);
emtf.setFont(plain);
addComponent(mainPanel, emtf, 3, gridy++, 1, 1, middleCenterInsets, GridBagConstraints.LINE_START,
GridBagConstraints.HORIZONTAL);
// JTable Creation
String[] headline = { "Id", "Name", "First Lastname", "Second Lastname", "Age", "Address", "Phone Number",
"E-Mail" };
String[][] data = { { "", "", "", "", "", "", "", "" }, { "", "", "", "", "", "", "", "" } };
JTable dataShow = new JTable(data, headline);
dataShow.setPreferredScrollableViewportSize(new Dimension(900, 300));
dataShow.setFillsViewportHeight(true);
JScrollPane scrollPane = new JScrollPane(dataShow);
addComponent(mainPanel, scrollPane, 0, gridy++, 4, 1, middleInsets, GridBagConstraints.LINE_START,
GridBagConstraints.HORIZONTAL);
// Table Personalization
dataShow.getTableHeader().setFont(bold11);
new HeaderRenderer(dataShow);
// buttons Components
JPanel buttonPanel = new JPanel();
buttonPanel.setLayout(new GridBagLayout());
JButton save = new JButton("Save");
save.setFont(bold12);
addComponent(buttonPanel, save, 0, 0, 1, 1, topInsets, GridBagConstraints.CENTER,
GridBagConstraints.HORIZONTAL);
JButton del = new JButton("Delete");
del.setFont(bold12);
addComponent(buttonPanel, del, 1, 0, 1, 1, topInsets, GridBagConstraints.CENTER,
GridBagConstraints.HORIZONTAL);
JButton edit = new JButton("Edit");
edit.setFont(bold12);
addComponent(buttonPanel, edit, 2, 0, 1, 1, topInsets, GridBagConstraints.CENTER,
GridBagConstraints.HORIZONTAL);
addComponent(mainPanel, buttonPanel, 0, gridy++, 4, 1, middleInsets, GridBagConstraints.LINE_START,
GridBagConstraints.HORIZONTAL);
// set content pane
frame.add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
// For future table filling
/*
* String ids = idtf.getText(); String names = nametf.getText(); String ln1s =
* ln1tf.getText(); String ln2s = ln2tf.getText(); String ags = agtf.getText();
* String ads = adtf.getText(); String pns = pntf.getText(); String ems =
* emtf.getText();
*/
}
private void addComponent(Container container, Component component, int gridx, int gridy, int gridwidth,
int gridheight, Insets insets, int anchor, int fill) {
GridBagConstraints gbc = new GridBagConstraints(gridx, gridy, gridwidth, gridheight, 1.0, 1.0, anchor, fill,
insets, 0, 0);
container.add(component, gbc);
}
public static void main(String[] args) {
// invoke runnable for thread safety
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new UserForm();
}
});
}
// LEFT alignment renderer
private class HeaderRenderer implements TableCellRenderer {
DefaultTableCellRenderer renderer;
public HeaderRenderer(JTable table) {
renderer = (DefaultTableCellRenderer) table.getTableHeader().getDefaultRenderer();
renderer.setHorizontalAlignment(JLabel.LEFT);
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus,
int row, int col) {
return renderer.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, col);
}
}
}