I have the following code. I added a textArea in my panel in joptionpane, but the frame size of box is so small and textArea is not fit in it. So, how can i largen the joptionpane box.
JPanel p = new JPanel(new BorderLayout(5,5));
JPanel labels = new JPanel(new GridLayout(0,1,2,2));
labels.add(new JLabel("Name", SwingConstants.RIGHT));
labels.add(new JLabel("Description", SwingConstants.RIGHT));
p.add(labels, BorderLayout.WEST);
JPanel controls = new JPanel(new GridLayout(0,1,4,4));
JTextField name = new JTextField();
controls.add(name);
JTextArea description = new JTextArea();
// description.addAncestorListener(new RequestFocusListener(false));
controls.add(description);
p.add(controls, BorderLayout.CENTER);
int result = JOptionPane.showConfirmDialog(null, p, "Create Atomic Action", JOptionPane.OK_CANCEL_OPTION);
if(result == JOptionPane.OK_OPTION)
{
System.out.println("Yes press Name"+name.getText()+" "+description.getText());
}else
System.out.println("Cancel press");
Besides setting the preferred size, as #dpassy suggested, I added a ScrollPane component, so that you can add more text (more than can be shown on the dialog box) and scroll down to the bottom. I, also, changed the layout from GridLayout to BorderLayout so that the TextBox doesn't grow unnecessarily to fill up the space.
package test;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
public class Test {
public static void main(String[] args) {
JPanel p = new JPanel(new BorderLayout(5, 5));
JPanel labels = new JPanel(new BorderLayout());
labels.add(new JLabel("Name", SwingConstants.RIGHT),BorderLayout.NORTH);
labels.add(new JLabel("Description", SwingConstants.RIGHT), BorderLayout.CENTER);
p.add(labels, BorderLayout.WEST);
JPanel controls = new JPanel(new BorderLayout());
JTextField name = new JTextField();
controls.add(name, BorderLayout.NORTH);
JTextArea description = new JTextArea();
JScrollPane sp = new JScrollPane(description);
// description.addAncestorListener(new RequestFocusListener(false));
sp.setPreferredSize(new Dimension(400, 100));
controls.add(sp, BorderLayout.CENTER);
p.add(controls, BorderLayout.CENTER);
JOptionPane.showConfirmDialog(null, p, "Create Atomic Action", JOptionPane.OK_CANCEL_OPTION);
}
}
As a result, it will show this dialog:
And when you add text inside the TextArea it will show the scroll bar too.
Related
I need to define a layout for a Jframe Window, as in the picture above.
Below is my approach.
A Picture from my resources folder (/resources/...jpg) embed inside the middle(main).
Top, Bottom, Left and Right divided in four parts, whereas their content is a labeled button stretched, so I can map some methods on it later, that change the picture inside the main container.
I tried to display the picture, but I get the result you see in my screenshot. I can't see it inside my main container and I receive no error message.
I don't know if this is because of my wrong approach of using JFrame.
Below you can see my code, I'd be happy if you could help me solving my wrong design layout pattern too.
MyFrame.java
package ms0.gui;
import javax.imageio.ImageIO;
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
public class MyFrame extends JFrame {
public MyFrame () {
setTitle("This is an example title");
setSize(600,600);
setLocation(750,640);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
//Main Container
Container mainContainer = this.getContentPane();
mainContainer.setLayout(new BorderLayout(8,6));
mainContainer.setBackground(Color.BLUE);
this.getRootPane().setBorder(BorderFactory.createMatteBorder(4, 4, 4, 4, Color.green));
//JButton Positions
JButton topButton = new JButton("Oben");
JButton bottomButton = new JButton("Unten");
JButton leftButton = new JButton("Links");
JButton rightButton = new JButton("Rechts");
//Panel Top
JPanel topPanel = new JPanel();
topPanel.setBorder(new LineBorder(Color.BLACK, 3));
topPanel.setBackground(Color.ORANGE);
topPanel.setLayout(new FlowLayout(5));
topPanel.add(topButton);
mainContainer.add(topPanel, BorderLayout.NORTH);
//Panel Middle
JPanel middlePanel = new JPanel();
middlePanel.setBorder(new LineBorder(Color.black, 3));
middlePanel.setLayout(new FlowLayout(4,4,4));
middlePanel.setBackground(Color.cyan);
//Grid Panel Right
JPanel rightPanel = new JPanel();
rightPanel.setLayout(new FlowLayout(4,4,4));
rightPanel.setBorder(new LineBorder(Color.black, 3));
rightPanel.setBackground(Color.GREEN);
rightPanel.add(rightButton);
//Grid Panel Left
JPanel gridPanel = new JPanel();
gridPanel.setLayout(new GridLayout(4,1,5,5));
gridPanel.setBorder(new LineBorder(Color.black, 3));
gridPanel.setBackground(Color.red);
gridPanel.add(leftButton);
//Center Box
JLabel label = new JLabel("Center Box", SwingConstants.CENTER);
label.setOpaque(true);
label.setBorder(new LineBorder(Color.black,3));
middlePanel.add(gridPanel);
mainContainer.add(label);
mainContainer.add(middlePanel, BorderLayout.WEST);
mainContainer.add(rightPanel, BorderLayout.EAST);
//Panel Bottom
JPanel bottomPanel = new JPanel();
bottomPanel.setLayout(new FlowLayout(3));
bottomPanel.add(bottomButton);
bottomPanel.setBackground(Color.magenta);
bottomPanel.setBorder(new LineBorder(Color.BLUE, 3));
mainContainer.add(bottomPanel, BorderLayout.SOUTH);
//Siegel
String filepath = "/resources/siegel.jpg";
int picWidth = 150;
int picHeight = 150;
ImageIcon image1 = new ImageIcon(getClass().getResource(filepath));
//Image scaledImage = img.getScaledInstance(picWidth, picHeight, Image.SCALE_DEFAULT);
//ImageIcon icon = new ImageIcon(scaledImage);
mainContainer.add(new JButton(image1));
}
}
So, as a very basic example, nothing but BorderLayout
import java.awt.BorderLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;
import javax.swing.border.EmptyBorder;
public class MyFrame extends JFrame {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
MyFrame frame = new MyFrame();
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public MyFrame() {
setTitle("This is an example title");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLayout(new BorderLayout());
add(new JButton("Top button (stretched)"), BorderLayout.NORTH);
add(new JButton("Left button (stretched)"), BorderLayout.WEST);
add(new JButton("Right button (stretched)"), BorderLayout.EAST);
add(new JButton("Bottom button (stretched)"), BorderLayout.SOUTH);
JLabel label = new JLabel("Picture");
label.setBorder(new EmptyBorder(100, 100, 100, 100));
add(label);
}
}
Remember, simple is often best.
Now, if you absolutely, positively must have the label/picture in another container, you can simply make use of GridBagLayout, as it will centre the child component(s) by default, for example...
JLabel label = new JLabel("Picture");
label.setBorder(new EmptyBorder(100, 100, 100, 100));
// Automatic center position
JPanel mainPane = new JPanel(new GridBagLayout());
mainPane.add(label);
add(mainPane);
And you don't have to use EmptyBorder. GridBagLayout will allow to supply insets which will do the same thing
More help needed with this little project of mine again, this time trying to get two labels that are inside a panel in certain positions. Those positions being one on the left and then a separation of spaces (like a tab) and then the second label to make way for entries being added below them when a button is pressed which I am also unsure how to start.
I've uploaded an image of the current program running :
As you can see I have two buttons (may change to one at some point) and then a separate results panel with currently two labels inside that I want to move. I want 'Name' to be on the left side and 'Grade' slightly more to the right (separated by about a tabs worth of space). I'm also unsure what the two little lines are so if someone could explain that to me it would be great.
Where I plan to go with this is then for a button entry to lead to a name entry being entered below these labels and a grade entry being entered below these labels which keeps updating with each button press. If anyone could guide me in the right direction for this it would be great. I have provided the code for the panel below.
Thanks for taking the time to read this!
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Scanner;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class GradePanel2 extends JPanel {
private JButton addEntry, calculate;
private JLabel name, grade, nameResult, gradeResult;
private JTextField nameField, gradeField, resultField;
public GradePanel2() {
// Button to add entry to list
addEntry = new JButton("Add entry to list");
addEntry.addActionListener(new buttonListener());
// Button to print all entries in correct format
calculate = new JButton("Print all user grades");
calculate.addActionListener(new buttonListener());
//Create Labels
name = new JLabel("Enter student name: ");
nameField = new JTextField(10);
nameField.addActionListener(new buttonListener());
grade = new JLabel("Enter students mark: ");
gradeField = new JTextField(5);
gradeField.addActionListener(new buttonListener());
//Result Labels
nameResult = new JLabel("NAME");
gradeResult = new JLabel("GRADE");
//Bottom segment for result
resultField = new JTextField();
resultField.setOpaque(false);
resultField.setEditable(false);
setLayout(new BorderLayout());
//Bottom Panel
JPanel GradePanel = new JPanel();
GradePanel.setBorder(BorderFactory.createTitledBorder("Students/Results"));
GradePanel.setOpaque(false);
GradePanel.setPreferredSize(new Dimension(0 , 100));
GradePanel.add(resultField);
resultField.setAlignmentX(LEFT_ALIGNMENT);
GradePanel.add(nameResult);
GradePanel.add(gradeResult);
//Button Panel
JPanel ButtonPane = new JPanel();
ButtonPane.setLayout(new BoxLayout(ButtonPane, BoxLayout.PAGE_AXIS));
addEntry.setAlignmentX(CENTER_ALIGNMENT);
calculate.setAlignmentX(CENTER_ALIGNMENT);
ButtonPane.add(addEntry);
ButtonPane.add(Box.createVerticalStrut(10));
ButtonPane.add(calculate);
//Label Panel
JPanel labelPane = new JPanel();
labelPane.setLayout(new BoxLayout(labelPane, BoxLayout.PAGE_AXIS));
labelPane.add(name);
labelPane.add(Box.createRigidArea(new Dimension (5,0)));
labelPane.add(nameField);
labelPane.add(Box.createRigidArea(new Dimension (0,2)));
labelPane.add(grade);
labelPane.add(Box.createRigidArea(new Dimension (5,0)));
labelPane.add(gradeField);
//Add all panels to the main panel
add(labelPane, BorderLayout.NORTH);
add(ButtonPane, BorderLayout.CENTER);
add(GradePanel, BorderLayout.SOUTH);
setBackground(Color.WHITE);
setPreferredSize(new Dimension(400, 300));
}
public class buttonListener implements ActionListener{
public void actionPerformed(ActionEvent event){
String studentName;
int studentMark;
studentName = nameField.getText();
String intMark = gradeField.getText();
studentMark = Integer.parseInt(intMark);
}
}
}
and then the driver class:
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
public class Grade2{
public static void main(String[] args) {
Runnable runnable = new Runnable() {
#Override
public void run() {
JFrame frame = new JFrame("Grade Calculator");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
GradePanel2 panel = new GradePanel2();
frame.add(panel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
};
SwingUtilities.invokeLater(runnable);
}}
Take time to read this the most flexible Layout Manager that commonly used by programmer :)
https://docs.oracle.com/javase/tutorial/uiswing/layout/gridbag.html
Btw I separate your class Bottom Panel It's a little bit confused while reading it. Much better try the Nested Classes to look your code clean and easy to read.
https://docs.oracle.com/javase/tutorial/java/javaOO/nested.html
import java.awt.BorderLayout;
import java.awt.Color;
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.Scanner;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class GradePanel2 extends JPanel {
private JButton addEntry, calculate;
private JLabel name, grade, nameResult, gradeResult;
private JTextField nameField, gradeField, resultField;
public GradePanel2() {
// Button to add entry to list
addEntry = new JButton("Add entry to list");
addEntry.addActionListener(new buttonListener());
// Button to print all entries in correct format
calculate = new JButton("Print all user grades");
calculate.addActionListener(new buttonListener());
//Create Labels
name = new JLabel("Enter student name: ");
nameField = new JTextField(10);
nameField.addActionListener(new buttonListener());
grade = new JLabel("Enter students mark: ");
gradeField = new JTextField(5);
gradeField.addActionListener(new buttonListener());
//Bottom segment for result
resultField = new JTextField();
resultField.setOpaque(false);
resultField.setEditable(false);
setLayout(new BorderLayout());
GridBagConstraints nameResultConstraints = new GridBagConstraints();//Constraints
GridBagConstraints gradeResultConstraints = new GridBagConstraints();//Constraints
//Button Panel
JPanel ButtonPane = new JPanel();
ButtonPane.setLayout(new BoxLayout(ButtonPane, BoxLayout.PAGE_AXIS));
addEntry.setAlignmentX(CENTER_ALIGNMENT);
calculate.setAlignmentX(CENTER_ALIGNMENT);
ButtonPane.add(addEntry);
ButtonPane.add(Box.createVerticalStrut(10));
ButtonPane.add(calculate);
//Label Panel
JPanel labelPane = new JPanel();
labelPane.setLayout(new BoxLayout(labelPane, BoxLayout.PAGE_AXIS));
labelPane.add(name);
labelPane.add(Box.createRigidArea(new Dimension (5,0)));
labelPane.add(nameField);
labelPane.add(Box.createRigidArea(new Dimension (0,2)));
labelPane.add(grade);
labelPane.add(Box.createRigidArea(new Dimension (5,0)));
labelPane.add(gradeField);
myBottomPanel mybottompanel = new myBottomPanel();//Object
//Add all panels to the main panel
add(labelPane, BorderLayout.NORTH);
add(ButtonPane, BorderLayout.CENTER);
add(mybottompanel, BorderLayout.SOUTH);
setBackground(Color.WHITE);
setPreferredSize(new Dimension(400, 300));
}
public class myBottomPanel extends JPanel{
public myBottomPanel()
{
this.setLayout(new GridBagLayout());
//Result Labels
nameResult = new JLabel("NAME");
gradeResult = new JLabel("GRADE");
//Constraints
GridBagConstraints nameResultConstraints = new GridBagConstraints();
GridBagConstraints gradeResultConstraints = new GridBagConstraints();
//Bottom Panel
setBorder(BorderFactory.createTitledBorder("Students/Results"));
setOpaque(false);
setPreferredSize(new Dimension(0 , 100));
nameResultConstraints.anchor = GridBagConstraints.LINE_START;
nameResultConstraints.weightx = 0.5;
nameResultConstraints.weighty = 0.5;
add(nameResult,nameResultConstraints);
add(gradeResult);
}
}
public class buttonListener implements ActionListener{
public void actionPerformed(ActionEvent event){
String studentName;
int studentMark;
studentName = nameField.getText();
String intMark = gradeField.getText();
studentMark = Integer.parseInt(intMark);
}
}
}
and here is your Frame.
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
public class Grade2{
public static void main(String[] args) {
Runnable runnable = new Runnable() {
#Override
public void run() {
JFrame frame = new JFrame("Grade Calculator");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
GradePanel2 panel = new GradePanel2();
frame.add(panel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
};
SwingUtilities.invokeLater(runnable);
}}
OUTPUT
Hope this helps. :)
If you want data displayed in a column then you need to use an appropriate layout manager to achieve the effect you want.
Maybe you can use a GridBagLayout. You can have columns and spaces between the columns, but you need to use the appropriate constraints. Read the section from the Swing tutorial on How to Use GridBagLayout for more information and working examples.
However, the easier option would be to use a JTable which is a component designed for display data in rows/columns. Again check out the Swing tutorial on How to Use Tables.
I'm creating a simple Java JFrame in Eclipse with a label, 2 radio buttons with 2 textfields, and a JButton. When i run the program, the objects inside it are messed up, the buttons and textfields don't show up and sometimes a textfield takes the entire size of the frame. However, when I minimize/maximize the frame and then restore it, they work normally. Here's the code:
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
public class myframe {
public static void main(String s[]) {
JFrame frame = new JFrame("Title");
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
// This is an empty content area in the frame
JLabel jlbempty = new JLabel("");
jlbempty.setPreferredSize(new Dimension(500, 400));
frame.getContentPane().add(jlbempty, BorderLayout.CENTER);
frame.pack();
frame.setVisible(true);
frame.setBounds(0, 0, 500, 400);
JPanel panel = new JPanel();
frame.getContentPane().add(panel, BorderLayout.NORTH);
panel.setLayout(new BoxLayout(panel, BoxLayout.PAGE_AXIS));
panel.add(Box.createRigidArea(new Dimension(0,5)));
panel.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
JLabel label = new JLabel("My label");
panel.add(label);
JPanel buttonPane = new JPanel();
frame.add(buttonPane);
buttonPane.setLayout(new BoxLayout(buttonPane, BoxLayout.LINE_AXIS));
buttonPane.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
JRadioButton cb = new JRadioButton("1");
buttonPane.add(cb);
JTextField tf = new JTextField(0);
tf.setText("");
buttonPane.add(tf);
JPanel panel3 = new JPanel();
frame.add(panel3);
panel3.setLayout(new BoxLayout(panel3, BoxLayout.LINE_AXIS));
panel3.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
JRadioButton cb2 = new JRadioButton("2");
panel3.add(cb2);
JTextField tf2 = new JTextField(0);
tf.setText("");
panel3.add(tf2);
JPanel panel2 = new JPanel();
JButton button = new JButton("click me");
frame.add(panel2);
panel2.add(button);
button.addActionListener(new Action());
panel.add(buttonPane);
panel.add(panel3);
panel.add(panel2);
}
static class Action implements ActionListener{
public void actionPerformed(ActionEvent arg0) {
JFrame frame2 = new JFrame("Clicked");
frame2.setVisible(true);
frame2.setSize(100, 200);
JLabel label2 = new JLabel("You clicked me");
JPanel panel2 = new JPanel();
frame2.add(panel2);
frame2.add(label2);
}
}
}
In your main method you need to do this at the very end:
frame.pack();
frame.setVisible(true);
You should call frame.pack(); again after adding all the components, so that all the container elements can resize to fit their components best.
http://docs.oracle.com/javase/7/docs/api/java/awt/Window.html#pack()
You should also call frame.SetVisible(true); at the very end, so the form is only displayed ones all components are loaded (otherwise you can see a black box while it loads).
I'm trying to align a JLabel and a JScrollPane (containing a JTextArea) to the left of a JPanel. When I put the JTextArea directly in the panel, the alignment is correct. The alignment is only incorrect if the JTextArea is in the scroll pane.
import javax.swing.BoxLayout;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class Main {
public static void main(String[] args) {
JDialog dialog = new JDialog();
JPanel panel = new JPanel();
panel.setLayout(new BoxLayout(panel, BoxLayout.PAGE_AXIS));
panel.add(new JLabel("My Label"));
// panel.add(new JTextArea(3, 15));
panel.add(new JScrollPane(new JTextArea(3, 15)));
dialog.add(panel);
dialog.pack();
dialog.setVisible(true);
}
}
The first image below is with the scroll pane and the second image is without it. How can I align the scroll pane correctly?
Try to use alignmentX:
import java.awt.Component;
import javax.swing.*;
public class Main {
public static void main(String[] args) {
JDialog dialog = new JDialog();
JPanel panel = new JPanel();
panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
JLabel label = new JLabel("My Label");
label.setAlignmentX(Component.LEFT_ALIGNMENT);
panel.add(label);
JScrollPane pane = new JScrollPane(new JTextArea(3, 15));
pane.setAlignmentX(Component.LEFT_ALIGNMENT);
panel.add(pane);
dialog.add(panel);
dialog.pack();
dialog.setVisible(true);
}
}
Replace:
panel.add(new JLabel("My Label"));
By:
JPanel labelPan = new JPanel(new FlowLayout(FlowLayout.LEFT);
labelPan.add(new JLabel("My Label"));
panel.add(labelPan);
I would like to make a layout using Java Swing which looks like the following drawing.
(source: braun-abstatt.de)
On the left is a JPanel which is drawn through paintComponent() in a way that the graphics automatically scale when the window is resized. (The question isn't about that panel. That one's already done.)
Now I need some buttons (the black boxes, added in Photoshop for the drawing) to the right of the JPanel mentioned before. The height of the reddish areas at the top and bottom, next to which there should be just empty space, is calculated along the lines of CONSTANT_FACTOR * getHeight(). Next to each compartment on the left, there should be a group of buttons, lined up to the center of the respective compartment (see the blue lines).
The JPanel containing the buttons knows about the CONSTANT_FACTOR and the number of compartments, so it should be possible to feed this information into a layout manager.
Which layout manager would I best use to achieve this layout? I've read about all the different layout managers, but I can't quite figure out which one or which combination of them best fits in this case.
For example, by use of a different LayoutManager, a very easy and simple container, takes no more than 15-20 minutes:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
public class ThinLineFrame {
private JFrame frame = new JFrame();
private JScrollPane scrollPane;
private JPanel panel = new JPanel();
private JPanel panelNorth = new JPanel();
private JPanel panelCenter = new JPanel();
private JPanel panelCenterCh1 = new JPanel();
private JPanel panelCenterCh2 = new JPanel();
private JPanel panelCenterCh3 = new JPanel();
private JPanel panelCenterCh4 = new JPanel();
private JPanel panelCenterCh5 = new JPanel();
private JPanel panelSouth = new JPanel();
public ThinLineFrame() {
panelNorth.setBackground(Color.red.darker());
panelNorth.setPreferredSize(new Dimension(80, 30));
//
panelCenter.setBackground(Color.darkGray);
panelCenter.setLayout(new GridLayout(5, 1, 2, 2));
//
panelCenterCh1.setLayout(new BorderLayout());
JButton panelCenterCh1Button = new JButton();
panelCenterCh1.add(panelCenterCh1Button, BorderLayout.CENTER);
//
JButton panelCenterCh2Button1 = new JButton();
JButton panelCenterCh2Button2 = new JButton();
panelCenterCh2.setLayout(new GridLayout(2, 1, 2, 2));
panelCenterCh2.add(panelCenterCh2Button1);
panelCenterCh2.add(panelCenterCh2Button2);
//
JButton panelCenterCh3Button1 = new JButton();
JButton panelCenterCh3Button2 = new JButton();
panelCenterCh3.setLayout(new GridLayout(2, 1, 2, 2));
panelCenterCh3.add(panelCenterCh3Button1);
panelCenterCh3.add(panelCenterCh3Button2);
//
JButton panelCenterCh4Button1 = new JButton();
JButton panelCenterCh4Button2 = new JButton();
panelCenterCh4.setLayout(new GridLayout(2, 1, 2, 2));
panelCenterCh4.add(panelCenterCh4Button1);
panelCenterCh4.add(panelCenterCh4Button2);
//
panelCenterCh5.setLayout(new BorderLayout());
JButton panelCenterCh5Button = new JButton();
panelCenterCh5.add(panelCenterCh5Button, BorderLayout.CENTER);
//
panelCenter.add(panelCenterCh1);
panelCenter.add(panelCenterCh2);
panelCenter.add(panelCenterCh3);
panelCenter.add(panelCenterCh4);
panelCenter.add(panelCenterCh5);
//
panelSouth.setBackground(Color.red.darker());
panelSouth.setPreferredSize(new Dimension(80, 30));
//
panel.setLayout(new BorderLayout(2, 2));
panel.add(panelNorth, BorderLayout.NORTH);
panel.add(panelCenter, BorderLayout.CENTER);
panel.add(panelSouth, BorderLayout.SOUTH);
//
scrollPane = new JScrollPane(panel);
frame.add(scrollPane, BorderLayout.CENTER);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setPreferredSize(new Dimension(80, 600));
frame.setLocation(100, 150);
frame.pack();
frame.setVisible(true);
}
public static void main(String args[]) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
ThinLineFrame dlg = new ThinLineFrame();
}
});
}
}
You should try looking at MigLayout. It's a super flexible LayoutManager that is also very simple.
The code would look something like:
MigLayout layout = new MigLayout("flowy");
panel.setLayoutManager(layout);
panel.add(button1);
panel.adD(button2);
etc..
Try adding debug, flowy to the constructor to get a visual idea of what is going on.
GBC without an anchor, just with plain vanilla GridBagConstraints and preferred size.
Centered JButton with fixed size:
import java.awt.Container;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
public class MainWithFixSize {
public static void main(String[] argv) throws Exception {
JFrame frame = new JFrame();
Container container = frame.getContentPane();
GridBagLayout gbl = new GridBagLayout();
container.setLayout(gbl);
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 1;
gbc.gridy = 1;
JButton component = new JButton();
component.setPreferredSize(new Dimension(25, 25));
gbl.setConstraints(component, gbc);
container.add(component);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setPreferredSize(new Dimension(40, 90));
frame.pack();
frame.setVisible(true);
}
private MainWithFixSize() {
}
}