How do I add all of these component in a JPanel by using MigLayout and achieve the rest of the conditions as described in the above picture?
Using MigLayout you can simply add a JSeparator to the adjacent cell, giving it the growx property. For instance:
JLabel lblPersonal = new JLabel("Personal");
contentPane.add(lblPersonal, "cell 0 0");
contentPane.add(new JSeparator(), "cell 1 0,growx");
Or, perhaps a nicer way, is to use a border on a panel, while giving the panel a title as such:
import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import net.miginfocom.swing.MigLayout;
public class TitledPanel extends JFrame {
private static final long serialVersionUID = 1L;
private JPanel contentPane;
private JTextField textField;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
TitledPanel frame = new TitledPanel();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public TitledPanel() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(new MigLayout("", "[grow]", "[grow]"));
JPanel panel = new JPanel();
panel.setBorder(new TitledBorder(BorderFactory.createLineBorder(Color.LIGHT_GRAY), "Personal"));
contentPane.add(panel, "cell 0 0,grow");
JLabel lblLabel = new JLabel("Label 1");
panel.add(lblLabel);
textField = new JTextField();
panel.add(textField);
textField.setColumns(10);
pack();
}
}
Now, if you want to create a function that returns such panels when you pass a string parameter, you could extend a JPanel or create your own class that returns your custom-created JPanel with the given title label and separator.
Related
I've tried to use GridBagLayout. It makes the JTextArea parent container occupy a big width, but the text area itself didn't fill the width. Why?
And I hope the first button is close to the top and the second button is close to the bottom. How can I implement it?
Could you please advise how to correct my code?
The following code is all code for the demo.
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import java.awt.*;
public class Demo extends JFrame {
public Demo() throws HeadlessException {
add(new MainPanel());
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setVisible(true);
}
class MainPanel extends JPanel {
private final InputComponent inputComponent = new InputComponent();
private final ButtonsContainer buttons = new ButtonsContainer();
public MainPanel() {
setPreferredSize(new Dimension(800, 100));
setLayout(new GridBagLayout());
setBorder(new EmptyBorder(5, 5, 5, 5));
add(inputComponent,
buildConstraints(0, 0, 1, 1, GridConstraints.FILL_BOTH, 1.0, 1.0));
add(buttons,
buildConstraints(1, 0, 1, 1, GridConstraints.FILL_BOTH, 0.0, 1.0));
}
}
class InputComponent extends JComponent {
private final JTextArea textArea = new JTextArea();
public InputComponent() {
setLayout(new BorderLayout());
textArea.setLineWrap(true);
add(textArea, BorderLayout.CENTER);
}
}
class ButtonsContainer extends JComponent {
private final JButton button1 = new JButton("Button 1");
private final JButton button2 = new JButton("Button 2");
public ButtonsContainer() {
setLayout(new GridBagLayout());
add(button1, buildConstraints(0, 0, 1, 1, GridBagConstraints.HORIZONTAL, 1.0, 0.0));
add(button2, buildConstraints(0, 1, 1, 1, GridBagConstraints.HORIZONTAL, 1.0, 0.0));
}
}
public static void main(String[] args) {
EventQueue.invokeLater(() -> {
final Demo demo = new Demo();
});
}
private GridBagConstraints buildConstraints(
int x,
int y,
int gWidth,
int gHeight,
int fill,
double weightX,
double weightY
) {
final GridBagConstraints constraints = new GridBagConstraints();
constraints.gridx = x;
constraints.gridy = y;
constraints.gridwidth = gWidth;
constraints.gridheight = gHeight;
constraints.fill = fill;
constraints.weightx = weightX;
constraints.weighty = weightY;
return constraints;
}
}
Original Answer
Oracle has a helpful tutorial, Creating a GUI With Swing. Skip the Netbeans section.
Don't use a GUI builder. You wind up learning the idiosyncracies of the GUI builder, and not learning Java Swing.
I created the following GUI using a JFrame, a main JPanel, and a button JPanel. If you maximize the GUI, you'll see that the JTextArea expands and the JButtons stay towards the top and bottom.
Don't extend Swing components, or any other Java class, unless you want to override one or more of the class methods. Use composition over inheritance.
You can use multiple simple JPanels to create a complex GUI. The GridBagLayout has its uses, like creating a form. But all that was needed was multiple BorderLayouts.
Don't make Swing components class fields unless you need to access the field instance from more than one method.
Organize your code so it reads like an essay, with the most important code towards the top and the more detailed code towards the bottom. Ideally, the reader of your code will never have to page up to find out something. No, the compiler doesn't care about the order of the methods. But human readers sure do.
Here's the complete runnable code.
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class ExampleBorerLayoutGUI {
public static void main(String[] args) {
EventQueue.invokeLater(() -> {
new ExampleBorerLayoutGUI();
});
}
public ExampleBorerLayoutGUI() {
JFrame frame = new JFrame("");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(createMainPanel(), BorderLayout.CENTER);
frame.add(createButtonPanel(), BorderLayout.EAST);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
private JPanel createMainPanel() {
JPanel panel = new JPanel(new BorderLayout());
panel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
JTextArea textArea = new JTextArea(5, 40);
textArea.setLineWrap(true);
textArea.setWrapStyleWord(true);
JScrollPane scrollPane = new JScrollPane(textArea);
panel.add(scrollPane, BorderLayout.CENTER);
return panel;
}
private JPanel createButtonPanel() {
JPanel panel = new JPanel(new BorderLayout());
panel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
JButton button1 = new JButton("Button 1");
panel.add(button1, BorderLayout.NORTH);
JButton button2 = new JButton("Button 2");
panel.add(button2, BorderLayout.SOUTH);
return panel;
}
}
Edited to Add
Here's the GUI with three JButtons. You didn't say whether you wanted the third button on the top or the bottom. I chose the top.
I chose a GridLayout for the upper button JPanel. It's easy to add more JButtons to a GridLayout.
Here's the modified complete runnable code.
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridLayout;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class ExampleBorderLayoutGUI {
public static void main(String[] args) {
EventQueue.invokeLater(() -> {
new ExampleBorderLayoutGUI();
});
}
public ExampleBorderLayoutGUI() {
JFrame frame = new JFrame("Example Border Layout");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(createMainPanel(), BorderLayout.CENTER);
frame.add(createButtonPanel(), BorderLayout.EAST);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
private JPanel createMainPanel() {
JPanel panel = new JPanel(new BorderLayout());
panel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
JTextArea textArea = new JTextArea(5, 40);
textArea.setLineWrap(true);
textArea.setWrapStyleWord(true);
JScrollPane scrollPane = new JScrollPane(textArea);
panel.add(scrollPane, BorderLayout.CENTER);
return panel;
}
private JPanel createButtonPanel() {
JPanel panel = new JPanel(new BorderLayout());
panel.add(createUpperButtonPanel(), BorderLayout.NORTH);
panel.add(createLowerButtonPanel(), BorderLayout.SOUTH);
return panel;
}
private JPanel createUpperButtonPanel() {
JPanel panel = new JPanel(new GridLayout(0, 1, 5, 5));
panel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
JButton button1 = new JButton("Button 1");
panel.add(button1);
JButton button2 = new JButton("Button 2");
panel.add(button2);
return panel;
}
private JPanel createLowerButtonPanel() {
JPanel panel = new JPanel(new BorderLayout());
panel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
JButton button = new JButton("Button 3");
panel.add(button, BorderLayout.SOUTH);
return panel;
}
}
You can auto-generate the right UI code if you use Eclipse IDE's Window Builder:
https://www.eclipse.org/windowbuilder/
It is far easier to design your application that way. Set this up on your IDE and let it do the heavy lifting for you. If you wish to incorporate dynamic resizing of your UI elements, design the code to be responsive.
Hello I am trying to add a border or a line break separating the north section from the rest of the JPanel. Basically using set border I have a border around the whole window but then want a line from one section of the border straight across horizontally to the other side. when i add a border to a JPanel that is added to BorderLayout.NORTH it puts a whole border inside the section. not the outline of the section. hope you know what i mean.
Attached I have a section of my code that is holding all my JPanel code in it so far. any help I would love, thanks.
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
public class GamePanel extends JPanel {
private JTextPane playertext;
private JTextField wealthstring, currentwealth;
public GamePanel() {
super();
setLayout(new BorderLayout());
setBackground(Game.getBackgroundColor());
Border raised = BorderFactory.createRaisedBevelBorder();
Border lowered = BorderFactory.createLoweredBevelBorder();
setBorder(BorderFactory.createCompoundBorder(new EmptyBorder(4, 4, 4, 4), (BorderFactory.createCompoundBorder(raised, lowered))));
add(northpanel(), BorderLayout.NORTH);
add(eastpanel(), BorderLayout.EAST);
}
private JPanel northpanel() {
Font northfont = new Font("Engravers MT", Font.BOLD, 12);
playertext = new JTextPane();
playertext.setFont(northfont);
playertext.setEditable(false);
playertext.setText("Player: \n" + Game.getName());
playertext.setBackground(Game.getBackgroundColor());
playertext.setBorder(new EmptyBorder(10,10,10,10));
wealthstring = new JTextField("Money: ");
wealthstring.setFont(northfont);
wealthstring.setEditable(false);
wealthstring.setHorizontalAlignment(wealthstring.RIGHT);
wealthstring.setBorder(null);
wealthstring.setBackground(Game.getBackgroundColor());
currentwealth = new JTextField();
currentwealth.setFont(northfont);
currentwealth.setEditable(false);
currentwealth.setHorizontalAlignment(wealthstring.RIGHT);
currentwealth.setBackground(Game.getBackgroundColor());
currentwealth.setBorder(null);
String wealthrounded = String.format("%.2f", Game.getMoney());
currentwealth.setText(wealthrounded);
JPanel wealthtext = new JPanel();
wealthtext.setLayout(new GridLayout(2, 1));
wealthtext.setBackground(Game.getBackgroundColor());
wealthtext.setBorder(new EmptyBorder(10,10,10,10));
wealthtext.add(wealthstring);
wealthtext.add(currentwealth);
JPanel northpanel = new JPanel();
northpanel.setLayout(new BorderLayout());
northpanel.setBackground(Game.getBackgroundColor());
northpanel.add(playertext, BorderLayout.WEST);
northpanel.add(wealthtext, BorderLayout.EAST);
return northpanel;
}
private JPanel eastpanel() {
JButton tab1 = new JButton("Tab 1");
JButton tab2 = new JButton("Tab 2");
JButton tab3 = new JButton("Tab 3");
JPanel easttabs = new JPanel();
easttabs.setLayout(new GridLayout(1, 3));
easttabs.add(tab1);
easttabs.add(tab2);
easttabs.add(tab3);
JPanel eastpanels = new JPanel();
eastpanels.setLayout(new BorderLayout());
eastpanels.add(easttabs, BorderLayout.NORTH);
return eastpanels;
}
}
Like this?
For that we would use a JSeparator.
import java.awt.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
public class UnderlinePageStart {
private JComponent ui = null;
UnderlinePageStart() {
initUI();
}
public void initUI() {
if (ui!=null) return;
ui = new JPanel(new BorderLayout(4,4));
ui.setBorder(new EmptyBorder(4,4,4,4));
JPanel pageStart = new JPanel(new BorderLayout(2,2));
ui.add(pageStart, BorderLayout.PAGE_START);
pageStart.add(new JLabel("Page Start", SwingConstants.CENTER));
// add a 'horizontal line'
pageStart.add(new JSeparator(), BorderLayout.PAGE_END);
ui.add(new JScrollPane(new JTextArea(5, 25)));
}
public JComponent getUI() {
return ui;
}
public static void main(String[] args) {
Runnable r = new Runnable() {
#Override
public void run() {
UnderlinePageStart o = new UnderlinePageStart();
JFrame f = new JFrame("Underline Page Start");
f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
f.setLocationByPlatform(true);
f.setContentPane(o.getUI());
f.pack();
f.setMinimumSize(f.getSize());
f.setVisible(true);
}
};
SwingUtilities.invokeLater(r);
}
}
In the below example, in the west side of the border layout, there is a parent panel which has a BoxLayout and couple of panels inside. The problem is that the west panel covers the whole area from top to bottom. The FlowLayout used for child panels inside the parent panel consume a lot of area. Is it possible to compress each JPanel according to the components? Also, it should remain the same even when the window is maximized?
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import javax.swing.BoxLayout;
import javax.swing.JTextField;
import javax.swing.JCheckBox;
import javax.swing.JButton;
public class Sample extends JFrame {
private JPanel contentPane;
private JTextField textField;
private JTextField textField_1;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Sample frame = new Sample();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public Sample() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new BorderLayout(0, 0));
setContentPane(contentPane);
JPanel panel = new JPanel();
contentPane.add(panel, BorderLayout.NORTH);
JLabel lblNewLabel = new JLabel("New label");
panel.add(lblNewLabel);
JPanel panel_1 = new JPanel();
contentPane.add(panel_1, BorderLayout.WEST);
panel_1.setLayout(new BoxLayout(panel_1, BoxLayout.Y_AXIS));
JPanel panel_2 = new JPanel();
panel_1.add(panel_2);
textField = new JTextField();
panel_2.add(textField);
textField.setColumns(2);
textField_1 = new JTextField();
panel_2.add(textField_1);
textField_1.setColumns(2);
JPanel panel_3 = new JPanel();
panel_1.add(panel_3);
JCheckBox chckbxNewCheckBox = new JCheckBox("New check box");
panel_3.add(chckbxNewCheckBox);
JPanel panel_4 = new JPanel();
panel_1.add(panel_4);
JButton btnNewButton = new JButton("New");
panel_4.add(btnNewButton);
JButton btnNewButton_1 = new JButton("New");
panel_4.add(btnNewButton_1);
}
}
One approach is to add panel_1 to an enclosing panel. The default FlowLayout conforms itself to the preferred size of the enclosed components when you pack() the enclosing Window. I've added a gray panel to CENTER as a placeholder; resize the frame to see the effect.
JPanel flowPanel = new JPanel();
flowPanel.add(panel_1);
As tested:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import javax.swing.BoxLayout;
import javax.swing.JTextField;
import javax.swing.JCheckBox;
import javax.swing.JButton;
public class Sample extends JFrame {
private JPanel contentPane;
private JTextField textField;
private JTextField textField_1;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
Sample frame = new Sample();
frame.pack();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public Sample() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new BorderLayout(0, 0));
setContentPane(contentPane);
JPanel panel = new JPanel();
contentPane.add(panel, BorderLayout.NORTH);
JLabel lblNewLabel = new JLabel("New label");
panel.add(lblNewLabel);
JPanel panel_1 = new JPanel();
panel_1.setLayout(new BoxLayout(panel_1, BoxLayout.Y_AXIS));
JPanel panel_2 = new JPanel();
panel_1.add(panel_2);
textField = new JTextField();
panel_2.add(textField);
textField.setColumns(2);
textField_1 = new JTextField();
panel_2.add(textField_1);
textField_1.setColumns(2);
JPanel panel_3 = new JPanel();
panel_1.add(panel_3);
JCheckBox chckbxNewCheckBox = new JCheckBox("New check box");
panel_3.add(chckbxNewCheckBox);
JPanel panel_4 = new JPanel();
panel_1.add(panel_4);
JButton btnNewButton = new JButton("New");
panel_4.add(btnNewButton);
JButton btnNewButton_1 = new JButton("New");
panel_4.add(btnNewButton_1);
JPanel flowPanel = new JPanel();
flowPanel.add(panel_1);
contentPane.add(flowPanel, BorderLayout.WEST);
contentPane.add(new JPanel(){
#Override
public Dimension getPreferredSize() {
return new Dimension(320, 240);
}
#Override
public Color getBackground() {
return Color.lightGray;
}
}, BorderLayout.CENTER);
}
}
Why the textfield is not appearing on my panel which is inside my frame?
I mean is there some additional action necessary to make the components of the panel
visible?
I hope somebody can help me....
public class example1 {
public static void main(String[] args) {
JFrame tt=new TT();
}
}
class TT extends JFrame {
JTextField textField;
JPanel panel;
JButton button1;
JButton button2;
public TT() {
setSize(300, 300);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setTitle("Bla Blubb");
setResizable(false);
setLayout(null);
panel=new JPanel();
panel.setBounds(5, 5, 290, 290);
add(panel);
textField=new JTextField();
textField.setBounds(5, 5, 280, 50);
panel.add(textField);
setVisible(true);
}
}
import java.awt.FlowLayout;
import javax.swing.*;
class TT extends JFrame {
JTextField textField;
JPanel panel;
JButton button1;
JButton button2;
public TT() {
//setSize(300, 300); // better to use pack() (after components added)
//setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // better to use
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
//setLocationRelativeTo(null); // better to use..
setLocationByPlatform(true);
setTitle("Bla Blubb");
setResizable(false);
//setLayout(null); // better to use layouts with padding & borders
// set a flow layout with large hgap and vgap.
panel = new JPanel(new FlowLayout(SwingConstants.LEADING, 10, 10));
// panel.setBounds(5, 5, 290, 290); // better to pack()
add(panel);
//textField = new JTextField(); // suggest a size in columns
textField = new JTextField(8);
//textField.setBounds(5, 5, 280, 50); // to get height, set large font
textField.setFont(textField.getFont().deriveFont(50f));
panel.add(textField);
pack(); // make the GUI the minimum size needed to display the content
setVisible(true);
}
public static void main(String[] args) {
// GUIS should be constructed on the EDT.
JFrame tt = new TT();
}
}
I am having some problem with CardLayout. I have a panel and a Next button on it. upon clicking on it i want to display the 2nd panel. In my code, when i click on the Next buton, the next panel is not displayed. Can someone help me solve this ?
package com.test;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import java.awt.CardLayout;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class CardLay extends JFrame {
private JPanel contentPane;
private CardLayout ca;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
CardLay frame = new CardLay();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public CardLay() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
ca =new CardLayout(0, 0);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(ca);
JPanel panel = new JPanel();
panel.setLayout(null);
contentPane.add("1",panel);
JButton btnNext = new JButton("NEXT");
btnNext.setBounds(131, 93, 117, 29);
btnNext.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
ca.show(contentPane,"1");
System.out.println("button clicked");
}
});
panel.add(btnNext);
JPanel panel_1 = new JPanel();
contentPane.add(panel_1, "name_1353086933711396000");
JCheckBox chckbxNewCheckBox = new JCheckBox("New check box");
panel_1.add(chckbxNewCheckBox);
}
}
You need to call:
ca.show(contentPane, "name_1353086933711396000");
For this to work you will have to add the second panel like this:
contentPane.add("name_1353086933711396000", panel_1);
When using CardLayout make sure to keep navigation buttons on a separate container other then the 'cards' themselves, so that they can be visible throughout the navigation process. Here you could place a new navigation container in the frame's BorderLayout.SOUTH position. For sequential navigation, the methods previous and next are available.
Also avoid using absolute positioning (null layout). See Doing Without a Layout Manager (Absolute Positioning).
public CardLay() {
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(500, 400);
ca = new CardLayout(0, 0);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.setLayout(ca);
JPanel panel1 = new JPanel();
panel1.add(new JButton("Test Button"));
contentPane.add("card1", panel1);
JPanel panel2 = new JPanel();
contentPane.add("card2", panel2);
JCheckBox chckbxNewCheckBox = new JCheckBox("New check box");
panel2.add(chckbxNewCheckBox);
JPanel navigationPanel = new JPanel();
JButton btnPrevious = new JButton("< PREVIOUS");
btnPrevious.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
ca.previous(contentPane);
}
});
navigationPanel.add(btnPrevious);
JButton btnNext = new JButton("NEXT >");
btnNext.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
ca.next(contentPane);
}
});
navigationPanel.add(btnNext);
add(contentPane);
add(navigationPanel, BorderLayout.SOUTH);
}
Recommended: How to Use CardLayout