I want to know how to change the content of a JFrame at runtime. Like adding a new JPanel and removing the old JPanel.
You can consider using CardLayout to change the active panel in a frame.
Changing JPanel at runtime here is the Code :
package stack;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class RemoveAndAddPanel implements ActionListener{
JFrame frame;
JPanel firstPanel;
JPanel secondPanel;
JPanel controlPanel;
JButton nextButton;
JPanel panelContainer;
JButton preButton;
JPanel contentPane;
public RemoveAndAddPanel() {
JFrame.setDefaultLookAndFeelDecorated(true);
frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
firstPanel = new JPanel();
firstPanel.add(new JLabel("FirstPanel"));
firstPanel.setPreferredSize(new Dimension(100,100));
secondPanel = new JPanel();
secondPanel.add(new JLabel("Second panel"));
secondPanel.setPreferredSize(new Dimension(100,100));
panelContainer = new JPanel();
contentPane = new JPanel(new BorderLayout());
nextButton = new JButton("Next panel");
preButton = new JButton("PreButton");
controlPanel = new JPanel();
nextButton.addActionListener(this);
preButton.addActionListener(this);
preButton.setEnabled(false);
controlPanel.add(preButton);
controlPanel.add(nextButton);
panelContainer.setLayout(new BorderLayout());
panelContainer.add(firstPanel,BorderLayout.CENTER);
contentPane.add(controlPanel, BorderLayout.SOUTH);
contentPane.add(panelContainer,BorderLayout.CENTER);
frame.setContentPane(contentPane);
frame.setVisible(true);
frame.setSize(300,100);
}
#Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == nextButton) {
panelContainer.removeAll();
panelContainer.setSize(0,0);
panelContainer.setSize(secondPanel.getSize());
panelContainer.add(secondPanel,BorderLayout.CENTER);
panelContainer.revalidate();
nextButton.setEnabled(false);
preButton.setEnabled(true);
}
if (e.getSource() == preButton) {
panelContainer.removeAll();
panelContainer.setSize(0,0);
panelContainer.setSize(firstPanel.getSize());
panelContainer.add(firstPanel,BorderLayout.CENTER);
nextButton.setEnabled(true);
preButton.setEnabled(false);
}
}
public static void main(String args[]) {
new RemoveAndAddPanel();
}
}
JFrame.setContentPane()
Related
I have been trying to learn Buttons but it refuses to resize. Button1 (code below) just takes up the whole screen. I have seen other posts who's problem was that they didn't use
setMaximumSize();
but I'm using it and it still isn't working! I didn't make a JPanel yet. Here is my JFrame:
import java.awt.Dimension;
import javax.swing.JButton;
import javax.swing.JFrame;
public class Frame extends JFrame {
private JButton button1;
private JButton button2;
public Frame()
{
button1 = new JButton("Hello button1");
button2 = new JButton("Hello button2");
button2.setMaximumSize(new Dimension(100,100));
button1.setMaximumSize(new Dimension(100,100));
add(button2);
add(button1);
}
}
My main class is plain and simple:
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Panel extends JPanel{
public static void main(String args [])
{
Frame frame = new Frame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(500, 500);
frame.setVisible(true);
}
}
It's because the frame('s contentPane) has a BorderLayout by default. You add the buttons to BorderLayout.CENTER, so the layout manager ignores the minimum-, preferred- and maximumSize.
I just want them to come up small and side by side
For that you could use a simple FlowLayout. (And if you want them to be centered on the frame, a parent JPanel with a GridBagLayout)
If you want a custom width & height for the buttons, override their getPreferredSize method. Overriding this method is safer than calling setPreferredSize.
Example:
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Example {
public Example() {
JButton button1 = new JButton("Hello button1");
JButton button2 = new JButton("Hello button2") {
#Override
public Dimension getPreferredSize() {
int width = super.getPreferredSize().width;
return new Dimension(width, width);
}
};;
JPanel buttonPanel = new JPanel();
buttonPanel.add(button1);
buttonPanel.add(button2);
JPanel contentPanel = new JPanel(new GridBagLayout());
contentPanel.add(buttonPanel);
JFrame frame = new JFrame();
frame.setContentPane(contentPanel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 400);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
new Example();
}
});
}
}
I added a flowlayout and changed setMaximumSize to setPreferredSize. That should fix your problem.
Here try this:
import java.awt.Dimension;
import javax.swing.JButton;
import javax.swing.JFrame;
public class Frame extends JFrame {
private JButton button1;
private JButton button2;
public Frame()
{
button1 = new JButton("Hello button1");
button2 = new JButton("Hello button2");
button2.setPreferredSize(new Dimension(100,100));
button1.setPreferredSize(new Dimension(100,100));
add(button2);
add(button1);
}
}
<----now the other class--->
import java.awt.FlowLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Panel extends JPanel{
public static void main(String args [])
{
Frame frame = new Frame();
frame.setLayout(new FlowLayout());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(500, 500);
frame.setVisible(true);
}
}
Problem - the given codes below is not displaying my JPanel(PageOne) and I am not sure why is it not displaying my JPanel(PageOne). Please Help.
I have added the JPanel(PageOne) to my panel which has a cardLayout();
I have set my JFrame to visible already.
PageOne.java
import javax.swing.JLabel;
import javax.swing.JPanel;
public class PageOne extends JPanel {
public PageOne() {
JLabel label = new JLabel("Page 1");
JPanel panel = new JPanel();
panel.add(label);
} }
PageTwo.java
import javax.swing.JLabel;
import javax.swing.JPanel;
public class PageTwo extends JPanel {
public PageTwo() {
JLabel label = new JLabel("Page 2");
JPanel panel = new JPanel();
panel.add(label);
}
}
DisplayUI.java
import java.awt.CardLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class DisplayUI {
public static void main(String[] args) {
new DisplayUI();
}
public DisplayUI() {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
CardLayout cardLayout = new CardLayout();
JFrame frame = new JFrame("frame");
JPanel panel = new JPanel();
panel.setLayout(cardLayout);
panel.add(new PageOne(), "1");
panel.add(new PageTwo(), "2");
cardLayout.show(panel,"1");
frame.add(panel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
You're not actually adding anything to PageOne or PageTwo panels...
public PageOne() {
JLabel label = new JLabel("Page 1");
JPanel panel = new JPanel();
panel.add(label);
// But nothing is actually added to "this"...
}
Unless you "really" need it, you can get rid of the second JPanel and add the label directly to PageOne (and the same thing goes for PageTwo)
public PageOne() {
JLabel label = new JLabel("Page 1");
add(label);
}
Or add the JPanel you create (which contains the label)
public PageOne() {
JLabel label = new JLabel("Page 1");
JPanel panel = new JPanel();
panel.add(label);
add(panel);
}
Remember, JPanel is type of Container, it can have child components.
Get the content pane of frame and than try adding :
Container container=frame.getContentPane();
container.add(panel);
Hope this helps you.
I have problem with tabs in the JPanel. I know how to make new tabs in Mainframe, but I don't know how to make tabs into JPanel which is located in Mainframe.
Here are the pictures:
I have program looking like this -
http://www.bildites.lv/viewer.php?file=vklfhvfdfpwpcxllfqv.png
But I want to make it look like this -
http://www.bildites.lv/viewer.php?file=bvbrp4qfx2krn9bkx30j.png
And Here is my code of the blue JPanel:
package gui;
import java.awt.Color;
import javax.swing.JPanel;
public class CallsPanel extends JPanel {
private MainFrame frame;
Color color = new Color(99, 184, 255); // steelblue
public CallsPanel(MainFrame frame) {
this.frame = frame;
this.setLocation(0, 0);
this.setSize(300, 380);
this.setLayout(null);
this.setBackground(color);
this.initContent();
}
// -------------------------------------------------------------------------
// Declare New Things
private void initContent() {
// Add New Things
}
// -------------------------------------------------------------------------
}
Thanks a lot to people that will help!
JTabbedPane tabPane = new JTabbedPane();
JPanel panel1 = new JPanel();
JPanel panel2 = new JPanel();
JLabel label1 = new JLabel("Tab 1");
JLabel label2 = new JLabel("Tab 2");
panel1.add(label1);
panel2.add(label2);
tabPane.add("Tab 1", panel1);
tabPane.add("Tab 2", panel2);
this.add(tabPane);
Play around with the size/color/shape of the tabPane and see what works for you. But this is the basic of a tabPane.
See this simple runnable example
import java.awt.BorderLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.SwingUtilities;
import javax.swing.border.EmptyBorder;
public class MyPanel extends JPanel {
JButton button = new JButton("Button");
JTabbedPane tabPane = new JTabbedPane();
public MyPanel(){
JPanel panel1 = new JPanel();
JPanel panel2 = new JPanel();
tabPane.add("Panel 1", panel1);
tabPane.add("Panel 2", panel2);
tabPane.setBorder(new EmptyBorder(10, 10, 10, 10));
setLayout(new BorderLayout());
add(tabPane, BorderLayout.CENTER);
add(button, BorderLayout.SOUTH);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
JFrame frame = new JFrame();
frame.add(new MyPanel());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationByPlatform(true);
frame.setSize(300, 300);
frame.setVisible(true);
}
});
}
}
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 have tried to find the answer but I'm coming up short. I am fairly new to java. I have 4 classes (1 main with a JFrame and 3 JPanels).
The main class creates the JFrame and adds the 3 panels to it.
What I am trying to accomplish is update a JLabel or JTextField in 1 panel (panelA) from an ActionEvent in another panel (panelB).
The ActionEvent in panelB runs a method in panelA that runs the setText() method and the repaint() method. I cannot get the JLabel or JTextField to update with the new text.
Here is my code:
App.java
public class App {
public static void main(String[] args) {
JFrame nameFrame = new JFrame("Name Form");
nameFrame.setLayout(new BorderLayout());
nameFrame.setSize(300,150);
nameFrame.setLocationRelativeTo(null);
nameFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
MiddlePanel middlePanel = new MiddlePanel();
nameFrame.add(middlePanel, BorderLayout.CENTER);
BottomPanel bottomPanel = new BottomPanel();
nameFrame.add(bottomPanel, BorderLayout.SOUTH);
nameFrame.setVisible(true);
}
}
BottomPanel.java
import java.awt.FlowLayout;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class BottomPanel extends JPanel {
private JLabel welcomeLabel = new JLabel("Old Text");
BottomPanel() {
super(new FlowLayout());
add(welcomeLabel);
}
public void setText(String text) {
welcomeLabel.setText(text);
repaint();
}
}
MiddlePanel.java
import java.awt.BorderLayout;
import javax.swing.JButton;
import javax.swing.JTextArea;
import javax.swing.JPanel;
import java.awt.event.*;
import java.awt.Graphics;
public class MiddlePanel extends JPanel {
MiddlePanel() {
super(new BorderLayout());
JButton okButton = new JButton("OK");
okButton.setSize(20, 20);
OKButtonListener okButtonListener = new OKButtonListener();
okButton.addActionListener(okButtonListener);
add(okButton, BorderLayout.EAST);
}
class OKButtonListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
BottomPanel bottomPanel = new BottomPanel();
bottomPanel.setText("New Text");
}
}
}
Thanks for any help.
In your OKButtonListener you create a new instance of BottomPanel which has nothing to do with the BottomPanel you added to your JFrame.
You will need the actual reference of the BottomPanel that you added in your JFrame.
d1rk nailed it. Here is one way to achieve that effect.
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.event.*;
import javax.swing.*;
public class App {
public static void main(String[] args) {
JFrame nameFrame = new JFrame("Name Form");
nameFrame.setLayout(new BorderLayout());
nameFrame.setSize(300,150);
nameFrame.setLocationRelativeTo(null);
nameFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
BottomPanel bottomPanel = new BottomPanel();
MiddlePanel middlePanel = new MiddlePanel(bottomPanel);
nameFrame.add(middlePanel, BorderLayout.CENTER);
nameFrame.add(bottomPanel, BorderLayout.SOUTH);
nameFrame.setVisible(true);
}
}
class BottomPanel extends JPanel {
private JLabel welcomeLabel = new JLabel("Old Text");
BottomPanel() {
super(new FlowLayout());
add(welcomeLabel);
}
public void setText(String text) {
welcomeLabel.setText(text);
repaint();
}
}
class MiddlePanel extends JPanel {
private BottomPanel bottomPanel;
MiddlePanel(BottomPanel bottomPanel) {
super(new BorderLayout());
this.bottomPanel = bottomPanel;
JButton okButton = new JButton("OK");
okButton.setSize(20, 20);
OKButtonListener okButtonListener = new OKButtonListener();
okButton.addActionListener(okButtonListener);
add(okButton, BorderLayout.EAST);
}
class OKButtonListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
//BottomPanel bottomPanel = new BottomPanel();
bottomPanel.setText("New Text");
}
}
}