当我动态创建文本和标签框时，它应该采用“Textbox：Labelbox”格式，然后当我再次单击“添加”按钮时，相同的模式应该在下一行重复，依此类推......我应该使用哪种布局使用和如何？
这是我使用的代码
if(field_name.getText().equals("")){
error.setForeground(Color.red);
error.setText("Enter the Field name first");
} else {
JLabel l = new JLabel(field_name.getText(), JLabel.RIGHT);
JTextField textField = new JTextField();
Dimension dim = new Dimension(20,30);
textField.setPreferredSize(dim);
field_layer.add(l);
field_layer.add(textField);
SpringUtilities.makeCompactGrid(field_layer,
numPairs, 2, //rows, cols
6, 6, //initX, initY
6, 6); //xPad, yPad
numPairs++;
field_layer.invalidate();
this.pack();
}
答案 0 :(得分：7)
一个选项是GridBagLayout。为了正确使用此布局，您需要了解GridBagConstraints。这是一个tutorial，可以帮助您入门。
这是一个简单的例子：
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.LineBorder;
public class MyExample
{
// Field members
static JPanel panel = new JPanel();
static Integer indexer = 1;
static List<JLabel> listOfLabels = new ArrayList<JLabel>();
static List<JTextField> listOfTextFields = new ArrayList<JTextField>();
public static void main(String[] args)
{
// Construct frame
JFrame frame = new JFrame();
frame.setLayout(new GridBagLayout());
frame.setPreferredSize(new Dimension(300, 300));
frame.setTitle("My Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Frame constraints
GridBagConstraints frameConstraints = new GridBagConstraints();
// Construct button
JButton addButton = new JButton("Add");
addButton.addActionListener(new ButtonListener());
// Add button to frame
frameConstraints.gridx = 0;
frameConstraints.gridy = 0;
frame.add(addButton, frameConstraints);
// Construct panel
panel.setPreferredSize(new Dimension(200, 200));
panel.setLayout(new GridBagLayout());
panel.setBorder(LineBorder.createBlackLineBorder());
// Add panel to frame
frameConstraints.gridx = 0;
frameConstraints.gridy = 1;
frameConstraints.weighty = 1;
frame.add(panel, frameConstraints);
// Pack frame
frame.pack();
// Make frame visible
frame.setVisible(true);
}
static class ButtonListener implements ActionListener
{
@Override
public void actionPerformed(ActionEvent arg0)
{
// Clear panel
panel.removeAll();
// Create label and text field
listOfTextFields.add(new JTextField());
listOfLabels.add(new JLabel("Label " + indexer));
// Create constraints
GridBagConstraints textFieldConstraints = new GridBagConstraints();
GridBagConstraints labelConstraints = new GridBagConstraints();
// Add labels and text fields
for(int i = 0; i < indexer; i++)
{
// Text field constraints
textFieldConstraints.gridx = 0;
textFieldConstraints.gridy = i;
// Label constraints
labelConstraints.gridx = 1;
labelConstraints.gridy = i;
// Add them to panel
panel.add(listOfTextFields.get(i), textFieldConstraints);
panel.add(listOfLabels.get(i), labelConstraints);
}
// Align components top-to-bottom
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = indexer;
c.weighty = 1;
panel.add(new JLabel(), c);
// Increment indexer
indexer++;
}
}
}
注意：不要仅限于此特定布局管理器。也就是说，您也应该探索其他Layout Managers。
答案 1 :(得分：3)
我对上面的代码做了一些改动.....
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.LineBorder;
public class MyExample
{
// Field members
static JPanel panel = new JPanel();
static Integer indexer = 1;
static List<JLabel> listOfLabels = new ArrayList<JLabel>();
static List<JTextField> listOfTextFields = new ArrayList<JTextField>();
public static void main(String[] args)
{
// Construct frame
JFrame frame = new JFrame();
frame.setLayout(new GridBagLayout());
frame.setPreferredSize(new Dimension(990, 990));
frame.setTitle("My Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Frame constraints
GridBagConstraints frameConstraints = new GridBagConstraints();
// Construct button
JButton addButton = new JButton("Add");
addButton.addActionListener(new ButtonListener());
// Add button to frame
frameConstraints.gridx = 0;
frameConstraints.gridy = 0;
frame.add(addButton, frameConstraints);
// Construct panel
panel.setPreferredSize(new Dimension(600, 600));
panel.setLayout(new GridBagLayout());
panel.setBorder(LineBorder.createBlackLineBorder());
// Add panel to frame
frameConstraints.gridx = 0;
frameConstraints.gridy = 1;
frameConstraints.weighty = 1;
frame.add(panel, frameConstraints);
// Pack frame
frame.pack();
// Make frame visible
frame.setVisible(true);
}
static class ButtonListener implements ActionListener
{
@Override
public void actionPerformed(ActionEvent arg0)
{
// Clear panel
panel.removeAll();
// Create label and text field
JTextField jTextField = new JTextField();
jTextField.setSize(100, 200);
listOfTextFields.add(jTextField);
listOfLabels.add(new JLabel("Label " + indexer));
// Create constraints
GridBagConstraints textFieldConstraints = new GridBagConstraints();
GridBagConstraints labelConstraints = new GridBagConstraints();
// Add labels and text fields
for(int i = 0; i < indexer; i++)
{
// Text field constraints
textFieldConstraints.gridx = 1;
textFieldConstraints.fill = GridBagConstraints.HORIZONTAL;
textFieldConstraints.weightx = 0.5;
textFieldConstraints.insets = new Insets(10, 10, 10, 10);
textFieldConstraints.gridy = i;
// Label constraints
labelConstraints.gridx = 0;
labelConstraints.gridy = i;
labelConstraints.insets = new Insets(10, 10, 10, 10);
// Add them to panel
panel.add(listOfLabels.get(i), labelConstraints);
panel.add(listOfTextFields.get(i), textFieldConstraints);
}
// Align components top-to-bottom
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = indexer;
c.weighty = 1;
panel.add(new JLabel(), c);
// Increment indexer
indexer++;
panel.updateUI();
}
}
}
答案 2 :(得分：2)
我会推荐一个GridBagLayout。您可以使用：
JPanel pan = new JPanel(); // For Swing
//or Panel pan = new Panel(); for AWT
pan.setLayout(new GridBagLayout());
GridBagConstraints textC = new GridBagConstraints();
textC.gridx = 0;
GridBagConstraints labelC= new GridBagConstraints();
labelC.gridx = 1;
// For Every (J)TextField
pan.add(text,textC);
// For Every (J)Label
label.add(label,labelC);
答案 3 :(得分：2)
我修改了一些代码和
看到这个 package formbuilder;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.LineBorder;
public class CreateFormFields {
// Field members
static JPanel panel = new JPanel();
static Integer indexer = 1;
static List<JLabel> listOfLabels = new ArrayList<JLabel>();
static List<JTextField> listOfTextFields = new ArrayList<JTextField>();
static List<JTextField> listDataType = new ArrayList<JTextField>();
static List<JTextField> listRange = new ArrayList<JTextField>();
static List<JTextField> listLable = new ArrayList<JTextField>();
public static void main(String[] args) {
// Construct frame
JFrame frame = new JFrame();
frame.setLayout(new GridBagLayout());
frame.setPreferredSize(new Dimension(990, 990));
frame.setTitle("Form Creator");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Frame constraints
GridBagConstraints frameConstraints = new GridBagConstraints();
// Construct button
JButton addButton = new JButton("Add");
JButton createButton = new JButton("Create Form");
addButton.addActionListener(new ButtonListener());
createButton.addActionListener(new CreateForm());
// Add button to frame
frameConstraints.gridx = 0;
frameConstraints.gridy = 0;
frame.add(addButton, frameConstraints);
frameConstraints.gridx = 0;
frameConstraints.gridy = 1;
frame.add(createButton, frameConstraints);
// Construct panel
panel.setPreferredSize(new Dimension(900, 900));
panel.setLayout(new GridBagLayout());
panel.setBorder(LineBorder.createBlackLineBorder());
// Add panel to frame
frameConstraints.gridx = 0;
frameConstraints.gridy = 2;
frameConstraints.weighty = 1;
frame.add(panel, frameConstraints);
// Pack frame
frame.pack();
// Make frame visible
frame.setVisible(true);
}
static class ButtonListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent arg0) {
// Clear panel
panel.removeAll();
// Create label and text field
JTextField jTextField = new JTextField();
jTextField.setSize(5, 20);
JTextField jTextField2 = new JTextField();
jTextField2.setSize(6, 20);
JTextField jTextField3 = new JTextField();
jTextField3.setSize(7, 20);
JTextField jTextField4 = new JTextField();
jTextField4.setSize(8, 20);
listOfTextFields.add(jTextField);
listDataType.add(jTextField2);
listRange.add(jTextField3);
listLable.add(jTextField4);
listOfLabels.add(new JLabel("LableName | FieldName | DataType | Range "));
// Create constraints
GridBagConstraints textFieldConstraints = new GridBagConstraints();
GridBagConstraints labelConstraints = new GridBagConstraints();
GridBagConstraints gridlistDataType = new GridBagConstraints();
GridBagConstraints gridlistRange = new GridBagConstraints();
GridBagConstraints gridlistLable = new GridBagConstraints();
// Add labels and text fields
for (int i = 0; i < indexer; i++) {
// Label constraints
labelConstraints.gridx = 0;
labelConstraints.gridy = i;
labelConstraints.insets = new Insets(10, 10, 10, 10);
// Text field constraints
textFieldConstraints.gridx = 1;
textFieldConstraints.fill = 1;//GridBagConstraints.HORIZONTAL;
textFieldConstraints.weightx = 0.5;
textFieldConstraints.insets = new Insets(10, 10, 10, 10);
textFieldConstraints.gridy = i;
gridlistDataType.gridx = 2;
gridlistDataType.fill = 1;//GridBagConstraints.HORIZONTAL;
gridlistDataType.weightx = 0.5;
gridlistDataType.insets = new Insets(10, 10, 10, 10);
gridlistDataType.gridy = i;
gridlistRange.gridx = 3;
gridlistRange.fill = 1;//GridBagConstraints.HORIZONTAL;
gridlistRange.weightx = 0.5;
gridlistRange.insets = new Insets(10, 10, 10, 10);
gridlistRange.gridy = i;
gridlistLable.gridx = 4;
gridlistLable.fill = 1;//GridBagConstraints.HORIZONTAL;
gridlistLable.weightx = 0.5;
gridlistLable.insets = new Insets(10, 10, 10, 10);
gridlistLable.gridy = i;
// Add them to panel
panel.add(listOfLabels.get(i), labelConstraints);
panel.add(listOfTextFields.get(i), textFieldConstraints);
panel.add(listDataType.get(i), gridlistDataType);
panel.add(listRange.get(i), gridlistRange);
panel.add(listLable.get(i), gridlistLable);
}
// Align components top-to-bottom
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = indexer;
c.weighty = 1;
panel.add(new JLabel(), c);
// Increment indexer
indexer++;
panel.updateUI();
}
}
static class CreateForm implements ActionListener {
@Override
public void actionPerformed(ActionEvent arg0) {
// Clear panel
panel.removeAll();
// Create label and text field
JTextField jTextField = new JTextField();
jTextField.setSize(5, 20);
JTextField jTextField2 = new JTextField();
jTextField2.setSize(6, 20);
JTextField jTextField3 = new JTextField();
jTextField3.setSize(7, 20);
JTextField jTextField4 = new JTextField();
jTextField4.setSize(8, 20);
listOfTextFields.add(jTextField);
listDataType.add(jTextField2);
listRange.add(jTextField3);
listLable.add(jTextField4);
listOfLabels.add(new JLabel("LableName | FieldName | DataType | Range "));
// Create constraints
GridBagConstraints textFieldConstraints = new GridBagConstraints();
GridBagConstraints labelConstraints = new GridBagConstraints();
GridBagConstraints gridlistDataType = new GridBagConstraints();
GridBagConstraints gridlistRange = new GridBagConstraints();
GridBagConstraints gridlistLable = new GridBagConstraints();
// Add labels and text fields
for (int i = 0; i < indexer; i++) {
// Label constraints
labelConstraints.gridx = 0;
labelConstraints.gridy = i;
labelConstraints.insets = new Insets(10, 10, 10, 10);
// Text field constraints
textFieldConstraints.gridx = 1;
textFieldConstraints.fill = 1;//GridBagConstraints.HORIZONTAL;
textFieldConstraints.weightx = 0.5;
textFieldConstraints.insets = new Insets(10, 10, 10, 10);
textFieldConstraints.gridy = i;
gridlistDataType.gridx = 2;
gridlistDataType.fill = 1;//GridBagConstraints.HORIZONTAL;
gridlistDataType.weightx = 0.5;
gridlistDataType.insets = new Insets(10, 10, 10, 10);
gridlistDataType.gridy = i;
gridlistRange.gridx = 3;
gridlistRange.fill = 1;//GridBagConstraints.HORIZONTAL;
gridlistRange.weightx = 0.5;
gridlistRange.insets = new Insets(10, 10, 10, 10);
gridlistRange.gridy = i;
gridlistLable.gridx = 4;
gridlistLable.fill = 1;//GridBagConstraints.HORIZONTAL;
gridlistLable.weightx = 0.5;
gridlistLable.insets = new Insets(10, 10, 10, 10);
gridlistLable.gridy = i;
// Add them to panel
panel.add(listOfLabels.get(i), labelConstraints);
panel.add(listOfTextFields.get(i), textFieldConstraints);
panel.add(listDataType.get(i), gridlistDataType);
panel.add(listRange.get(i), gridlistRange);
panel.add(listLable.get(i), gridlistLable);
}
// Align components top-to-bottom
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = indexer;
c.weighty = 1;
panel.add(new JLabel(), c);
// Increment indexer
indexer++;
panel.updateUI();
}
}
}