I have 3 JPanels and I want to place them all in one JPanel. I used the GridBagLayout for the main panel. But only one panel is getting added. Why might this be?
gblayout=new GridBagLayout();
gbc=new GridBagConstraints();
panel1Customizer();
panel2customizer();
panel3Customizer();
setLayout(gblayout);
gbc.fill=GridBagConstraints.HORIZONTAL;
gbc.anchor=GridBagConstraints.NORTHWEST;
gbc.weightx=1;
gbc.weighty=1;
gbc.gridheight=GridBagConstraints.REMAINDER;
add(panel1, gbc);
add(panel2, gbc);
gbc.gridwidth=GridBagConstraints.REMAINDER;
add(panel3, gbc);
The customizer methods are ones which add items into these panels.
I am not sure but I think you need to add a GridBagConstraints to your GridBagLayout. Try look at this site to get the idea on how to work with GridBagLayout:
link
Or maybe just use another Layout for your JFrame, maybe BorderLayout or GridLayout to arrange your Panels correctly
You should change gbc.gridx and/or gbc.gridy to be different for each panel
you have to read How to Use GridBagLayout, examples for that here and GridBagConstraints, change your gbc.fill=GridBagConstraints.HORIZONTAL;, if you have problem(s) with JComponent's Size then add setPreferedSize(); for example
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.*;
public class GBLFillBoth extends JFrame {
private static final long serialVersionUID = 1L;
public GBLFillBoth() {
JPanel panel = new JPanel();
GridBagLayout gbag = new GridBagLayout();
panel.setLayout(gbag);
GridBagConstraints c = new GridBagConstraints();
JButton btn1 = new JButton("One");
c.fill = GridBagConstraints.BOTH;
//c.fill = GridBagConstraints.HORIZONTAL;
c.anchor=GridBagConstraints.NORTHWEST;
c.gridx = 0;
c.gridy = 0;
c.weightx = 0.5;
c.weighty = 0.5;
panel.add(btn1, c);
JButton btn2 = new JButton("Two");
c.gridx++;
panel.add(btn2, c);
//c.fill = GridBagConstraints.BOTH;
JButton btn3 = new JButton("Three");
c.gridx = 0;
c.gridy++;
c.gridwidth = 2;
panel.add(btn3, c);
add(panel);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setVisible(true);
}
public static void main(String[] args) {
GBLFillBoth gBLFillBoth = new GBLFillBoth();
}
}
You might consider using a MigLayout instead, the code is much simpler:
panel1Customizer();
panel2customizer();
panel3Customizer();
setLayout(new MigLayout("fill, wrap 3"));
add(panel1, "grow");
add(panel2, "grow");
add(panel3, "grow");
Related
First of all I looked around stackoverflow and I didnt find anything related to my problem.
Im trying to use the GridBagLayout, the first time I tried it it was functioning, but I dont know what I did, that now it doesnt displays anything, do you have any idea of mas happening??
Heres all code:
package Instrucciones;
import java.awt.*;
import javax.swing.*;
/**
*
* #author Antonio
*/
public class JDialog1TxArea extends JDialog {
JPanel panel = new JPanel(); //Contains all objects
JTextArea instruc;
JButton ok;
public JDialog1TxArea(String instrucciones){
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
setTitle("Instrucciones");
pack();
setSize(450,300);
setLocationRelativeTo(null);
setVisible(true);
JPanel mainpanel = new JPanel();
getContentPane().add(mainpanel);
panel = new JPanel();
panel.setLayout(new GridBagLayout());
mainpanel.add(panel);
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = 0;
c.anchor = GridBagConstraints.CENTER;
instruc = new JTextArea(instrucciones);
ok = new JButton("Aceptar");
panel.add(instruc, c);
c.gridy++;
panel.add(ok, c);
c.gridy++;
}
public static void main (String args[]){
JDialog1TxArea v = new JDialog1TxArea("Conalep");
}
}
The console doesnt have any exception.
Move setVisible to the last line in the constructor
public JDialog1TxArea(String instrucciones) {
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
setTitle("Instrucciones");
// From here
//pack();
//setSize(450, 300);
//setLocationRelativeTo(null);
//setVisible(true);
JPanel mainpanel = new JPanel();
getContentPane().add(mainpanel);
panel = new JPanel();
panel.setLayout(new GridBagLayout());
mainpanel.add(panel);
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = 0;
c.anchor = GridBagConstraints.CENTER;
instruc = new JTextArea(instrucciones);
ok = new JButton("Aceptar");
panel.add(instruc, c);
c.gridy++;
panel.add(ok, c);
c.gridy++;
// To here
pack();
setLocationRelativeTo(null);
setVisible(true);
}
I'd like to disencourage you from extending from top level containers like JDialog and instead design your UI's using JPanel as your base container. You can then add these to what ever top level container you want, even, in your case, using something like JOptionPane. See How to Make Dialogs for more details
You may also want to have a look at How to Use Scroll Panes, as your JTextArea will benefit from it
Trying to understand how the GridBagLayout for Java works. Never used it before so its probably a stupid error that I've made.
My objective is to place a JLabel at the top center of the page. I've been using the java tutorials on Oracle but have had no luck. It seems the label remains in the center of the page. (center as in dead center of the x and y graph).
From what I understood, if I set the gridx and gridy constraint to 0, the compiler will look at the top, first row of the program and place the text their. I then used the PAGE START anchor to place the text in the center of the page. I'm not entirely sure what the weightx and weighty function does in my defence.
import javax.swing.*;
import java.awt.*;
class test
{
public static void main (String Args [])
{
//frame and jpanel stuff
JFrame processDetail = new JFrame("Enter information for processes");
JPanel panelDetail = new JPanel(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
//label to add on top centre
JLabel label = new JLabel("LOOK AT ME");
//set size of frame and operation
processDetail.setSize(500,500);
processDetail.setDefaultCloseOperation(processDetail.EXIT_ON_CLOSE);
//add the label to panel
c.fill = GridBagConstraints.HORIZONTAL;
c.anchor = GridBagConstraints.PAGE_START;
c.weightx = 0; //not sure what this does entirely
c.gridx = 0; //first column
c.gridy = 0; //first row
panelDetail.add(label, c);
processDetail.add(panelDetail);
processDetail.setVisible(true);
}
}
You're only adding one thing to the GBL using container, and so it will be centered. If you add a 2nd component below your JLabel, the JLabel will show up at the top. For example,
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.*;
public class Test2 {
private static void createAndShowGui() {
JPanel mainPanel = new JPanel(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.gridheight = 1;
gbc.gridwidth = 1;
gbc.weightx = 1.0;
gbc.weighty = 1.0;
gbc.fill = GridBagConstraints.BOTH;
gbc.anchor = GridBagConstraints.PAGE_START;
mainPanel.add(new JLabel("Look at me!", SwingConstants.CENTER), gbc);
gbc.gridy = 1;
gbc.gridheight = 10;
gbc.gridwidth = 10;
mainPanel.add(Box.createRigidArea(new Dimension(400, 400)), gbc);
JFrame frame = new JFrame("Test2");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
Myself, I'd use BorderLayout if I wanted my JLabel to be at the top.
I am trying to align a button using the GridBagLayout but it look I just can't achieve that. Also I want to remove the JButton's texture from my custom button, but I can not.. This is what it looks like:
I want the buttons to be at the top( but using GridBagLayout) and also on the left and right margin of the green button there is the remains of the JButton style and I can't remove it completely.
Also, this is my code:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TestPanel{
public TestPanel(){
JFrame frame = new JFrame();
frame.add(new Panel1());
frame.setVisible(true);
frame.setSize(300, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new TestPanel();
}
public class Panel1 extends JPanel{
/**
*
*/
private static final long serialVersionUID = 1L;
public Panel1(){
setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
ImageIcon im = new ImageIcon("Start.png");
ImageIcon i = new ImageIcon("Start-Pressed.png");
JButton button = new JButton(im);
JButton but = new JButton("BUT");
button.setRolloverEnabled(true);
Insets margin = new Insets(-15,-10,-10,-10);
button.setBorderPainted(false);
button.setMargin(margin);
button.setRolloverIcon(i);
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx=0.5;
c.gridx=0;
c.gridy=0;
add(button, c);
c.gridx=2;
c.gridy=1;
add(but,c);
}
}
}
Edit:
c.gridy++;
c.fill = GridBagConstraints.VERTICAL;
c.weighty = 1;
c.add(new JLabel(" "),c);
c.gridy++;
c.weighty = 1;
c.fill = GridBagConstraints.NONE;
add(eButton, c);
You can achive it with help of dummy JLabel at bottom, like next(add to the end of constructor):
c.gridy++;
c.fill = GridBagConstraints.VERTICAL;
c.weighty = 1;
add(new JLabel(" "), c);
To remove margin you can try setContentAreaFilled() method
Instead of ImageIcon im = new ImageIcon("Start.png"); use ImageIcon im = new ImageIcon(Panel1.class.getResource("Start.png"));
Also see that answer.
I am relatively new to Java Swing and I am having a little trouble understanding how Grid layouts can do certain things and if they can't, then how the gridbag layout, which is supposedly more powerful can do that.
Here is a program i tried with Grid layout
import javax.swing.*;
import java.awt.*;
//import java.awt.event.*;
public class Swing24
{
public static void main(String[] args)
{
JFrame f1= new JFrame("Grid Layout Test");
f1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f1.setResizable(true);
f1.setLocation(500,200);
f1.setSize(600,600);
JPanel p1 = new JPanel();
p1.setBackground(Color.black);
f1.add(p1);
JButton b1= new JButton("Button 1");
b1.setBackground(Color.white);
JButton b2= new JButton("Button 2");
b2.setBackground(Color.white);
JButton b3= new JButton("Button 3");
b3.setBackground(Color.white);
JLabel lb1=new JLabel(" Label 1");
lb1.setForeground(Color.orange);
//lb1.setOpaque(true);
lb1.setBackground(Color.yellow);
JLabel lb2=new JLabel(" Label 2");
lb2.setBackground(Color.orange);
lb2.setOpaque(true);
GridLayout glm1=new GridLayout(2,3,0,0);
p1.setLayout(glm1);
p1.add(b1);
p1.add(b2);
p1.add(b3);
p1.add(lb1);
p1.add(lb2);
f1.setVisible(true);
}
}
The above program allows me divide the container into 2 rows and 3 columns. Basically I can divide a container into m rows and n columns with a grid layout. But it adds the components(the butons and labels) serially.
Question 1: How can I directly add a button to the cell(4,3) in a grid of size(10,10)?
Question 2: Can a button occupy multiple cells in a grid layout?
If the answer to any of the above is not possible, then how can gridbag layout help solve the problem.
I tried using gridbag layout with a button. But it gets placed in the center! How can I, say, place it to the cell(4,3) in a container which can be divided into size(10,10)<10 rows and 10 columns>
1) You can't add component to specific cell,but inthat question you can find some type of trick for that.
2)Here is another trick with nested lyout inside cells, for merging.
You can do all what you want with help of GridBagLayout. Watch GridBagConstraints it helps you to layout components properly.
See properties of GridBagConstraints:
gridwidth, gridheight, gridx, gridy, anchor.
But you would need some trick with empty spaces around cell(4,3) , if you want to add only one component to your container.
Also read tutorial for GridBagLayout.
EDIT: you can try something like this
public class Form extends JFrame {
public Form() {
getContentPane().setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = 0;
c.weightx = 1;
c.weighty = 1;
for(int i =0;i<10;i++){
c.gridx = i;
for(int j =0;j<10;j++){
c.gridy = j;
if(i == 3 && j == 2){
c.fill = GridBagConstraints.NONE;
getContentPane().add(new JButton("btn"),c);
} else {
c.fill = GridBagConstraints.BOTH;
JPanel p = new JPanel();
p.setBorder(BorderFactory.createLineBorder(Color.red));
getContentPane().add(p,c);
}
}
}
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setLocationRelativeTo(null);
}
public static void main(String[] args) throws Exception {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new Form().setVisible(true);
}
});
}
}
EDIT2: It's not realy cell(4,3) but in same proportions
public Form() {
getContentPane().setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = 0;
c.weightx = 0.2;
c.weighty = 0.3;
c.fill = GridBagConstraints.BOTH;
getContentPane().add(new JLabel(" "),c);
c.gridx++;
c.gridy++;
c.fill = GridBagConstraints.NONE;
getContentPane().add(new JButton("btn"),c);
c.weightx = 0.7;
c.weighty = 0.6;
c.gridx++;
c.gridy++;
c.fill = GridBagConstraints.BOTH;
getContentPane().add(new JLabel(" "),c);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setLocationRelativeTo(null);
}
or real cell(4,3), but more then 3 components and less then 100:
public Form() {
getContentPane().setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = 0;
c.weightx = 1;
c.weighty = 1;
for(int i =0;i<2;i++){
getContentPane().add(new JLabel(" "),c);
c.gridx++;
}
for(int i =0;i<3;i++){
getContentPane().add(new JLabel(" "),c);
c.gridy++;
}
c.gridx = 3;
c.gridy = 4;
getContentPane().add(new JButton("btn"),c);
for(int i =0;i<7;i++){
getContentPane().add(new JLabel(" "),c);
c.gridx++;
}
for(int i =0;i<6;i++){
getContentPane().add(new JLabel(" "),c);
c.gridy++;
}
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setLocationRelativeTo(null);
}
I have a Swing Form that contains a JScrollPane(activityScrollPane) for a JPanel(activityPanel). The panel contains a JTextField and a JButton (that is used to add more fields to the Panel). Now the problem is that the elements start from the center of the panel as in the image below (with the borders marking the activityScrollPane boundary)
Following is the code I am currently using to make the scroll pane and associated components.
//part of the code for creating the ScrollPane
final JPanel activityPanel = new JPanel(new GridBagLayout());
gbc.gridx=0;
gbc.gridy=0;
JScrollPane activityScrollPane = new JScrollPane(activityPanel);
//adding activity fields
activityFields = new ArrayList<JTextField>();
fieldIndex = 0;
activityFields.add(new JTextField(30));
final GridBagConstraints activityGBC = new GridBagConstraints();
activityGBC.gridx=0;
activityGBC.gridy=0;
activityGBC.anchor = GridBagConstraints.FIRST_LINE_START;
activityPanel.add(activityFields.get(fieldIndex),activityGBC);
fieldIndex++;
JButton btn_more = (new JButton("more"));
activityGBC.gridx=1;
activityPanel.add(btn_more,activityGBC);
How can I make the JTextField and the JButton or for that matter any component to appear on the top left corner of the JScrollPane. I have already tried using
activityConstraints.anchor = GridBagConstraints.NORTHWEST;
as pointed in the SO post, but it does not at all seem to work.
You simply forgot to provide any weightx/weighty values, atleast one having a non-zero value will do. have a look at this code example :
import java.awt.*;
import javax.swing.*;
public class GridBagLayoutDemo
{
private JTextField tfield1;
private JButton button1;
private void displayGUI()
{
JFrame frame = new JFrame("GridBagLayout Demo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel contentPane = new JPanel();
contentPane.setLayout(new GridBagLayout());
tfield1 = new JTextField(10);
GridBagConstraints gbc = new GridBagConstraints();
gbc.anchor = GridBagConstraints.FIRST_LINE_START;
gbc.weightx = 1.0;
gbc.weighty = 1.0;
gbc.gridx = 0;
gbc.gridy = 0;
gbc.fill = GridBagConstraints.HORIZONTAL;
contentPane.add(tfield1, gbc);
button1 = new JButton("More");
gbc.gridx = 1;
gbc.gridy = 0;
gbc.fill = GridBagConstraints.NONE;
contentPane.add(button1, gbc);
frame.setContentPane(contentPane);
frame.pack();
frame.setVisible(true);
}
public static void main(String... args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
new GridBagLayoutDemo().displayGUI();
}
});
}
}
Latest EDIT : No spacing along Y-Axis
import java.awt.*;
import javax.swing.*;
public class GridBagLayoutDemo
{
private JTextField tfield1;
private JButton button1;
private JTextField tfield2;
private JButton button2;
private void displayGUI()
{
JFrame frame = new JFrame("GridBagLayout Demo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel contentPane = new JPanel();
contentPane.setLayout(new GridBagLayout());
tfield1 = new JTextField(10);
GridBagConstraints gbc = new GridBagConstraints();
gbc.anchor = GridBagConstraints.FIRST_LINE_START;
gbc.weightx = 1.0;
//gbc.weighty = 0.2;
gbc.gridx = 0;
gbc.gridy = 0;
gbc.fill = GridBagConstraints.HORIZONTAL;
contentPane.add(tfield1, gbc);
button1 = new JButton("More");
gbc.gridx = 1;
gbc.gridy = 0;
gbc.fill = GridBagConstraints.NONE;
contentPane.add(button1, gbc);
tfield2 = new JTextField(10);
gbc.weightx = 1.0;
gbc.weighty = 0.2;
gbc.gridx = 0;
gbc.gridy = 1;
gbc.fill = GridBagConstraints.HORIZONTAL;
contentPane.add(tfield2, gbc);
button2 = new JButton("More");
gbc.gridx = 1;
gbc.gridy = 1;
gbc.fill = GridBagConstraints.NONE;
contentPane.add(button2, gbc);
JScrollPane scroller = new JScrollPane(contentPane);
frame.add(scroller);
frame.pack();
frame.setVisible(true);
}
public static void main(String... args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
new GridBagLayoutDemo().displayGUI();
}
});
}
}
Sorry as my answer me be on the off-side of what you have asked, but why dont you use GroupLayout instead of GridBag Layout, thats much more easier to handle
try it with BorderLayout: controls.setLayout(new BorderLayout()); and then apply it for your JPanel controls.add(yourPanel, BorderLayout.PAGE_START);
I also have problems with GridBagLayout so i solved it with BorderLayout and it works so fine.
So i wrote for your little example:
private void initComponents() {
controls = new Container();
controls = getContentPane();
controls.setLayout(new BorderLayout());
panel = new JPanel();
panel.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
field = new JTextField(20);
c.gridx = 0;
c.gridy = 0;
panel.add(field, c);
one = new JButton("Go!");
c.gridx = 1;
c.gridy = 0;
panel.add(one, c);
controls.add(panel, BorderLayout.PAGE_START);
}
Hope it helps!
I think this could be simple and possible, you can
put Nested JPanel to the JScrollPane
to this JPanel
put JPanels contains JComponent to the GridLayout (notice about scrolling, you have to change scrolling increment)
or use most complex JComponents as
put JPanels contains JComponent as Item to the JList
put JPanels contains JComponent as row to the JTable (with only one Column, with or without TableHeader)
Add one panel at the right and one at the bottom.
Right Panel:
Set Weight X to 1.0.
Set Fill to horizontal.
Bottom Panel:
Set Weight Y to 1.0.
Set Fill to vertical
There may be better ways to that, but this one worked for me.