How can i align everything to the center of the frame ? In my example code, the JLabel doesnt occupies the same % of space as the button.Its about 10% label and 90% button. How can i make them both have the same amount of space ? This is my code:
class Animation extends JPanel {
JLabel lab = new JLabel("A");
JButton but = new JButton("BUTTTTTTTOOOOOOOOOOOOON");
GridBagConstraints c = new GridBagConstraints();
public Animation(){
setLayout(new GridBagLayout());
c.gridx = 0 ;
c.gridy = 0;
add(lab,c);
c.gridx = 1;
add(but, c);
}
public static void main(String[] args) {
JFrame fram = new JFrame();
fram.add(new Animation());
fram.pack();
fram.setVisible(true);
}
}
Put the two of them into a 2x1 GridLayout -- it forces the same dimensions on each cell.
public Animation()
{
setLayout(new GridLayout());
add(lab);
add(but);
}
Related
I have the following code, and the result is as in the picture (I've not added the repetitive part of the code). Somehow,the panel gets color but the part where the layout is designed. What am I missing?
class Elements extends JPanel {
Elements() {
setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.insets = new Insets(10, 10, 10, 10);
JLabel l1 = new JLabel("l1");
c.gridx = 0;
c.gridy = 0;
add(l1, c);
JLabel l2 = new JLabel("l2");
c.gridx = 0;
c.gridy = 1;
add(l2, c);
}
public class MyFrame extends JFrame {
public static void main(String[] args) {
JFrame frame = new JFrame("Simple Calc");
JPanel p = new JPanel();
Elements elements = new Elements();
frame.add(p);
p.add(elements);
frame.setSize(1000, 500);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
p.setBackground(Color.blue);
Your Elements class extends JPanel. You see the default color of the JPanel, since you didn't set the color.
You can do either:
elements.setBackground( Color.BLUE );
to specifically set its background.
or
elements.setOpaque( false );
to make the panel transparent so you will see the background of its parent panel. This is the easies so you don't have to set the background twice if you ever decide to change it.
In your panel p, elements is in the foreground. try doing elements.setBackground(Color.blue); to achieve your desired behaviour.
I am having issue where my JPanel is not setting up the size. I am not sure if is something to do with my JTab or JFrame. I am using GridBagLayout layout management. And for some reason are not able to set the size.
Here is a dummy code, following the same logic to my original source code:
FirstPanel.java
import javax.swing.*;
import java.awt.*;
public class FirstPanel extends JPanel {
private JLabel label1 = new JLabel("Label 1");
private JTextField textField1 = new JTextField();
private GridBagConstraints c = new GridBagConstraints();
public FirstPanel() {
//Size is not overriding
Dimension size = getPreferredSize();
size.width = 100;
setPreferredSize(size);
setBorder(BorderFactory.createTitleBorder("Border Title");
setLayout(new GridBagLayout());
addComponents();
}
private void addComponents() {
c.gridx = 0;
c.gridy = 0;
c.anchor = GridBagConstraints.NORTHWEST;
c.insets = new Insets(5, 0, 0, 0);
add(label1, c);
c.gridx = 1;
add(textField1, c);
c.weightx = 1;
c.weighty = 1;
add(new JLabel(""), c);
}
}
MainPanel.java
import javax.swing.*;
import java.awt.*;
public class MainPanel {
private JFrame frame = new JFrame("App");
private JPanel panel1 = new JPanel(new GridBagLayout());
private GridBagConstraints c = new GridBagConstraints();
private JTabbedPane tabPane = new JTabbedPane();
public MainPanel() {
addComponents();
frame.add(tabPane);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(500, 350);
frame.setVisible(true);
frame.setLocationRelativeTo(null);
frame.setResizable(false);
}
private void addComponents() {
tabPane.addTab("Tab 1", new FirstPanel());
}
}
Main.java
public class Main {
public static void main(String[] args) {
new MainPanel();
}
}
Or at least have two JPanels,
Exactly.
Frist you create a main panel using a BorderLayout that you add to the tabbed pane.
Then you have a second panel for your labels and text fields (using whatever layout manager you want). Then you add this panel to the BorderLayout.LINE_START.
Then you add your scrollpane containing the JTable to the BorderLayout.CENTER of the main panel.
Read the tutorial on Layout Manager. Nest panels with different layout managers as required.
want to have JTable taking 50% of the other side.
Picking a random number like 50% is not the way to design a GUI. What happens if the frame is made smaller/larger. What happens to the space? Design the layout with flexibility in mind, just like your browser window is designed. There are always fixed areas where the size is determined by the components added and there is a flexible area that grows/shrinks as desired.
I'm trying to use GridBagLayout but the GridBagConstraints objects doesn't show any effect. I want a button to fill the horizontal space. Any Ideas?
static class Five extends JFrame {
public Five() {
setSize(300, 400);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = 0;
c.fill = GridBagConstraints.HORIZONTAL;
JButton button = new JButton("Long-Named Button 4");
add(button, c);
setVisible(true);
}
This works, details in comments:
import java.awt.*;
import javax.swing.*;
public class Five extends JFrame {
public Five() {
setSize(300, 400);
setDefaultCloseOperation(EXIT_ON_CLOSE);
// best to do all important stuff in a panel added to the frame
JPanel gui = new JPanel(new GridBagLayout());
setContentPane(gui);
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = 0;
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 1d; // fixes the problem
JButton button = new JButton("Long-Named Button 4");
add(button, c);
pack(); // should always be done after all components are added
setVisible(true);
}
public static void main(String[] args) {
Runnable r = new Runnable() {
#Override
public void run() {
new Five();
}
};
SwingUtilities.invokeLater(r);
}
}
Further tips:
There is no good case for extending JFrame in this case, just do the relevant additions etc. to an instance of a standard frame.
To make the button larger, set a large icon, large insets, or large font. To make the frame bigger, add an EmptyBorder around the gui panel.
Here is the code snippet:
public class Test {
Test(){
JFrame f=new JFrame();
JPanel panel=new JPanel();
GridBagLayout gb=new GridBagLayout();
panel.setLayout(gb);
GridBagConstraints gc= new GridBagConstraints();
gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=1;
gc.gridy=0;
String label="hello";
JLabel l1=new JLabel(label);
panel.add(l1,gc);
gc.anchor=GridBagConstraints.NORTHWEST;
gc.gridx=0;
gc.gridy=0;
JCheckBox check=new JCheckBox();
check.getAccessibleContext().setAccessibleDescription(label);
panel.add(check,gc);
f.add(panel);
f.setSize(200, 300);
f.setVisible(true);
}
public static void main(String[] args) {
Test t=new Test();
}
}
checkbox and label are coming fine from left to right but the problem which I am facing is label is coming little bit above from the checkbox what should I do to make them come in same line ?
As I have tested your code it was because of the gc.anchor=GridBagConstraints.NORTHWEST; the text is not aligning in the center of the checkbox. I don't get it why you needed that anchor but if you want to align the text and the checkbox to the left you can use setHorizontalTextPosition(SwingConstants.LEFT) as suggested by #a_horse_with_no_name. Try running this code below you'll see that it's perfectly aligned.
public class Testcheckbox {
GridBagLayout gb = new GridBagLayout();
GridBagConstraints gc = new GridBagConstraints();
public Testcheckbox(){
JFrame f=new JFrame();
JPanel content = new JPanel();
content.setLayout(new FlowLayout(SwingConstants.NORTH_WEST));
JPanel panel=new JPanel();
panel.setLayout(gb);
String label="hello";
JLabel l1=new JLabel(label);
l1.setHorizontalTextPosition(SwingConstants.LEFT);
// gc.anchor=GridBagConstraints.NORTHWEST;
gc.weightx = 0;
gc.weighty = 0;
gc.gridx = 1;
gc.gridy = 0;
panel.add(l1,gc);
JCheckBox check=new JCheckBox();
check.getAccessibleContext().setAccessibleDescription(label);
check.setHorizontalTextPosition(SwingConstants.LEFT);
// gc.anchor=GridBagConstraints.NORTH;
gc.weightx = 0;
gc.weighty = 0;
gc.gridx = 0;
gc.gridy = 0;
panel.add(check,gc);
f.add(content);
content.add(panel);
f.setSize(200, 300);
f.setVisible(true);
}
public static void main(String[] args) {
Testcheckbox t = new Testcheckbox();
}
}
EDIT
Check my code above again and I have updated it. I have added another panel so that the layout of the gridbag is not affected by where you want to put the content of the panel in the JPanel. Did I get that right?
I'm using a JTable and adding it to a panel which uses a gridbaglayout like so:
JTable qdbs = new JTable(rowData, columnNamesVector);
qdbs.setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS);
panel.add(qdbs, c);
I don't want the table to be in a scroll pane, but I do want the table to take up the entire width of the panel. How would I accomplish this?
An SSCCE as requested:
import javax.swing.*;
import java.awt.*;
public class Main{
public static void main(String[] args) {
new TestFrame();
}
public static class TestFrame extends JFrame{
public TestFrame() {
this.setTitle("SSCCE");
JPanel panel = new JPanel();
panel.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = 0;
c.insets = new Insets(10,10,10,10);
JTable testTable = new JTable(10,2);
panel.add(testTable, c);
this.add(panel);
this.pack();
this.setVisible(true);
}
}
}
I would like this table to always take up the entire width of the panel (except the insets). Currently the table does not change size when the frame is resized.
You need to add constrains to tell the layout what to do with more space. In your SSCCE add these items:
c.fill = GridBagConstraints.BOTH;
c.weightx = 1;
c.weighty = 0;
import java.awt.*;
import javax.swing.*;
public class Test
{
public static void main(String args[]) throws Exception
{
JPanel panel = new JPanel( new GridBagLayout() );
JTable table = new JTable(5, 5);
GridBagConstraints gbc = new GridBagConstraints();
gbc.weightx = 1.0;
gbc.fill = GridBagConstraints.HORIZONTAL;
panel.add(table, gbc);
JFrame frame = new JFrame();
frame.add(panel, BorderLayout.CENTER);
frame.pack();
frame.setVisible(true);
}
}
If you need more help post a SSCCE that demonstrates the problem.
c is a GridBagConstraint or something along those lines, I imagine? The very simplest thing to do would be to set the LayoutManager of the JPanel to a BorderLayout, then just add with the constraint BorderLayout.CENTER .
hmmm
Alex Bliskovsky wrote panel.add(qdbs, c);
that's wrong, not, never do that, you are forgot wrap you JTable to the ScrollPane and then you can play with some of LayoutManagers, for related examples for LayoutManagers check GridBagConstraints for GrigBagLayout
The following frame will correctly resize the table when the frame is resized.
public class Sandbox {
public static void main(String[] args) {
new TestFrame();
}
public static class TestFrame extends JFrame {
public TestFrame() {
this.setTitle("SSCCE");
JPanel panel = new JPanel();
panel.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.gridx = 0;
c.gridy = 0;
c.insets = new Insets(10, 10, 10, 10);
c.fill = GridBagConstraints.BOTH;
c.weightx = 1;
c.weighty = 1;
JTable testTable = new JTable(10, 2);
panel.add(testTable, c);
this.add(panel);
this.pack();
this.setVisible(true);
}
}
}
Perhaps with:
GridBagConstraints.fill = GridBagContraints.BOTH;