SOLVED
So I have an issue where when I click the button, I want an image to replace the entire content of the window. But it's only replacing, what I believe to be, a part of a panel. Should I not use panels in this instance? I found some code online which didn't use panels which worked, but maybe there is a scenario where I can remove the panel and just cover the entire frame with my image when the button is clicked?
import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
public class SatNav extends JFrame {
private JFrame frame;
private JPanel panel;
private JLabel satelliteLabel;
private JLabel aboutLabel;
private JButton satellite;
private JButton about;
public SatNav() {
frame = new JFrame("Work Package 5");
frame.setVisible(true);
frame.setSize(300, 380);
about = new JButton("About");
add(about);
event abo = new event();
about.addActionListener(abo);
panel = new JPanel();
frame.add(panel);
panel.add(about);
setLocationRelativeTo(null); //This is for centering the frame to your screen.
setDefaultCloseOperation(EXIT_ON_CLOSE); //This for closing your application after you closing the window.
}
public class event implements ActionListener {
public void actionPerformed(ActionEvent abo) {
ImagePanel imagePanel = new ImagePanel();
//JFrames methods
panel.add(imagePanel, BorderLayout.CENTER);
revalidate();
repaint();
about.setVisible(false);
//satellite.setVisible(false);
}
}
public class ImagePanel extends JPanel {
private BufferedImage image;
public ImagePanel() {
try {
image = ImageIO.read(new File("about.png"));
} catch (IOException ex) {
ex.printStackTrace();
}
setBorder(BorderFactory.createLineBorder(Color.black, 2));
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(image, 0, 0, getWidth(), getHeight(), null);
}
}
public static void main(String[] args) {
new SatNav();
}
}
Your problem is that you're treating the panel JPanel as if it has a BorderLayout when it doesn't. Rather it has JPanel's default FlowLayout which will size components to their preferred sizes (here [0, 0]) rather than have contained components fill the container. The simple solution: give your panel a BorderLayout:
panel = new JPanel(new BorderLayout());
Now when adding components, the BorderLayout constants will be respected by the container's layout.
Another and possibly better and more durable solution is to use a CardLayout to help you swap components.
For example:
import java.awt.CardLayout;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.*;
public class SatNav2 extends JPanel {
private static final long serialVersionUID = 1L;
// a publicly available example image for demonstration purposes:
public static final String SAT_PATH = "https://upload.wikimedia.org"
+ "/wikipedia/commons/1/18/AEHF_1.jpg";
private static final String INTRO_PANEL = "intro panel";
private static final String IMAGE_LABEL = "image label";
// our layout
private CardLayout cardLayout = new CardLayout();
// JLabel to display the image
private JLabel imgLabel = new JLabel();
public SatNav2(Image img) {
// put image into JLabel
imgLabel.setIcon(new ImageIcon(img));
// JPanel to hold JButton
JPanel introPanel = new JPanel();
// add button that does the swapping
introPanel.add(new JButton(new ShowImageAction("Show Image")));
// set the CardLayout and add the components. Order of adding
// is important since the first one is displayed
setLayout(cardLayout);
// add components w/ String constants
add(introPanel, INTRO_PANEL);
add(imgLabel, IMAGE_LABEL);
}
private class ShowImageAction extends AbstractAction {
public ShowImageAction(String text) {
super(text);
}
#Override
public void actionPerformed(ActionEvent e) {
// tell card layout to show next component
cardLayout.next(SatNav2.this);
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
try {
createAndShowGui();
} catch (IOException e) {
e.printStackTrace();
}
});
}
private static void createAndShowGui() throws IOException {
// get the image
URL imgUrl = new URL(SAT_PATH);
Image img = ImageIO.read(imgUrl);
// pass image into our new JPanel
SatNav2 mainPanel = new SatNav2(img);
JFrame frame = new JFrame("Satellite");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.add(mainPanel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
Related
I have looked at a lot of answers but i still cannot find a solution. I have a JFrame and two JPanels. I want to remove the one panel and replace it with the second when a button is pressed, but the repaint() method does not refresh the frame. Please help.
Here is my code for the frame:
import javax.swing.*;
import java.awt.*;
import static javax.swing.JFrame.EXIT_ON_CLOSE;
public class MainFrame
{
static JFrame mainFrame;
int height = 650;
int width = 1042;
public MainFrame()
{
mainFrame = new JFrame();
mainFrame.setBounds(0, 0, width, height);
mainFrame.setDefaultCloseOperation(EXIT_ON_CLOSE);
mainFrame.setResizable(false);
}
public static void main(String[] args)
{
new MainMenu();
mainFrame.setVisible(true);
}
}
This is the code for my MainMenu panel
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import static java.awt.Color.CYAN;
import static java.awt.Color.red;
public class MainMenu extends MainFrame
{
public MainMenu()
{
components();
}
//variable decleration
JPanel menuPanel;
JLabel title;
JButton periodicTable;
private void components()
{
int buttonW = 500;
int buttonH = 50;
//creating panel
menuPanel = new JPanel();
menuPanel.setLayout(null);
menuPanel.setBackground(CYAN);
//creating title label
title = new JLabel("Application Title", SwingConstants.CENTER);
title.setFont(new Font("Calibri Body", 0, 50));
title.setBounds(width / 3 - buttonW / 2, 50, buttonW, buttonH + 10);
//creating periodic table button
periodicTable = new JButton();
periodicTable.setText("Periodic Table");
periodicTable.setBounds(width / 3 - buttonW / 2, 50 + buttonH + 60, buttonW, buttonH);
periodicTable.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
periodicTableActionPerformed(event);
}
});
//adding components to panel
menuPanel.add(title);
menuPanel.add(periodicTable);
//adding panel to MainFrame
mainFrame.add(menuPanel);
}
private void periodicTableActionPerformed(ActionEvent event)
{
mainFrame.remove(menuPanel);
mainFrame.repaint();
new PeriodicTable();
mainFrame.repaint();
}
}
And finally my PeriodicTable panel
import javax.swing.*;
import java.awt.*;
public class PeriodicTable extends MainFrame
{
public PeriodicTable()
{
periodicComponents();
}
JPanel ptPanel;
private void periodicComponents()
{
ptPanel = new JPanel();
ptPanel.setLayout(null);
ptPanel.setBackground(Color.RED);
mainFrame.add(ptPanel);
}
}
I have no idea why you are extending MainFrame. Looks unnecessary to me.
I want to remove the one panel and replace it with the second when a button is pressed
Then use a CardLayout. Read the section from the Swing tutorial on How to Use CardLayout for a working example.
The tutorial will show you how to better structure your code.
Your PeriodicTable extends MainFrame. When creating new PeriodicTable you create with it new MainFrame which has its own instance of JFrame (MainFrame.mainFrame). You need to add that panel to existing mainFrame in MainMenu
I suggest removing changing your PeriodicTable class like this:
import javax.swing.*;
import java.awt.*;
public class PeriodicTable extends JPanel // Not MainFrame, but new custom panel
{
public PeriodicTable()
{
periodicComponents();
}
private void periodicComponents()
{
// You don't need ptPanel anymore, because `this` is JPanel
setLayout(null);
setBackground(Color.RED);
}
}
and change your actionPerformed function to something like this:
private void periodicTableActionPerformed(ActionEvent event)
{
mainFrame.remove(menuPanel); // Remove old panel
mainFrame.add(new PeriodicTable()); // Create and add to existing mainFrame
mainFrame.repaint(); // Just one repaint at the end
// I think it will work even without repaint, because add and remove should schedule repainting as well
}
I want to create a java Application like a widget. Here is my code below
package newpackage;
public class MainFrame extends JFrame {
JLabel imageLabel = new JLabel();
public MainFrame() {
try {
this.setUndecorated(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(new Dimension(360, 360));
ImageIcon ii = new ImageIcon(this.getClass().getResource("imageexcel.gif"));
imageLabel.setIcon(ii);
add(imageLabel, java.awt.BorderLayout.CENTER);
this.setVisible(true);
Shape shape=new Ellipse2D.Float(0,0,360,360);
AWTUtilities.setWindowShape(this, shape);
AWTUtilities.setWindowOpaque(this, false);
imageLabel.add(new JButton("START"));
} catch (Exception exception) {
exception.printStackTrace();
}
}
public static void main(String[] args) {
new MainFrame();
}
}
In the above code, I have done the following:
Created a Frame
Removed the Title Bar
Added the Background using JLabel
Changed the shape of window as circle according to the shape of image
Now I would like to add some components in to it and perform some action with them but no component is visible after adding.
I have tried adding to Frame as well as JLabel and no use from either.
This is the image i used for background
Please help me to proceed further....
Thanking you
JLabels use null layouts by default, and so your button will default to size 0,0. Try giving it a decent layout manager, even FlowLayout would likely work. Another solution is to keep the null layout and set the sizes and positions of added components, but this route is a dangerous route and one I don't recommend.
Actually a GridBagLayout works nice to center the components. Also add all components before calling setVisible(true):
imageLabel.setLayout(new GridBagLayout());
this.setUndecorated(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(new Dimension(360, 360));
ImageIcon ii = new ImageIcon(this.getClass().getResource("imageexcel.gif"));
imageLabel.setIcon(ii);
add(imageLabel, java.awt.BorderLayout.CENTER);
imageLabel.add(new JButton("START"));
this.setVisible(true);
or better?
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.GridBagLayout;
import java.awt.Image;
import java.awt.Shape;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.awt.geom.Ellipse2D;
import java.net.URL;
import javax.swing.*;
import com.sun.awt.AWTUtilities;
#SuppressWarnings("serial")
public class MainPanelOvalFrame extends JPanel {
private static final String RESOURCE_PATH = "imageexcel.gif";
private Window window;
private Image img;
public MainPanelOvalFrame(Window window, Image image) {
this.window = window;
this.img = image;
setLayout(new GridBagLayout());
add(new JButton(new StartAction("Start", KeyEvent.VK_S)));
int w = image.getWidth(this);
int h = image.getHeight(this);
Shape shape = new Ellipse2D.Float(0, 0, w, h);
AWTUtilities.setWindowShape(window, shape);
AWTUtilities.setWindowOpaque(window, false);
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (img != null) {
g.drawImage(img, 0, 0, this);
}
}
#Override
public Dimension getPreferredSize() {
if (isPreferredSizeSet() || img == null) {
return super.getPreferredSize();
}
int w = img.getWidth(this);
int h = img.getHeight(this);
return new Dimension(w, h);
}
private class StartAction extends AbstractAction {
public StartAction(String name, int mnemonic) {
super(name);
putValue(MNEMONIC_KEY, mnemonic);
}
#Override
public void actionPerformed(ActionEvent e) {
window.dispose();
}
}
private static void createAndShowGui() {
JFrame frame = new JFrame();
frame.setUndecorated(true);
URL imgUrl = MainPanelOvalFrame.class.getResource(RESOURCE_PATH);
Image image = new ImageIcon(imgUrl).getImage();
MainPanelOvalFrame mainPanel = new MainPanelOvalFrame(frame, image);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
You just need to set a Layout manager for imageLabel ,or use null as the Layout manager, then set the size and location of the JButton manually.
to use Layout Manager
imageLabel.setIcon(ii);
imageLabel.setLayout(new FlowLayout());
imageLabel.add(new JButton("START"));
//need to setLayout and add JButton before setVisible(true)
add(imageLabel, java.awt.BorderLayout.CENTER);
this.setVisible(true);
to use null layout
JButton j=new JButton("START");
j.setSize(100,50);
j.setLocation(imageLabel.getWidth()/2-j.getWidth()/2, imageLabel.getHeight()/2-j.getHeight()/2);
//then add Button into imageLabel
imageLabel.add(j);
Layout manager is usually recommended because it can fit different environment.
How to add an image as a background in JScrollPane?
I tried this but the image doesn't display:
BufferedImage img = null;
try {
img = ImageIO.read(new File("C:\\Users\\Suraj\\Documents\\NetBeansProjects\\JavaApplication2\\src\\javaapplication2\\images\\2.jpg"));
}
catch (IOException e) {
e.printStackTrace();
}
Image imag = img.getScaledInstance(d.width, d.height, Image.SCALE_SMOOTH);
ImageIcon imageBack = new ImageIcon(imag);
FlowLayout fl = new FlowLayout();
frame.getContentPane().setLayout(fl);
fl.addLayoutComponent(null, new JLabel(imageBack));
EDIT : I would like to add jlabels and jbuttons on the JScrollPane with the background
If your goal is to simply show an image in a JScrollPane without showing other components (such as a JTable) in the JScrollPane, then you should:
Make an ImageIcon out of your image via new ImageIcon(myImage)
Add that Icon to a JLabel
Place the JLabel into the JScrollPane's viewport, something that can be done by passing the JLabel into the JScrollPane's constructor.
And your done.
If you need to do something else, then describe your problem in greater detail.
For example,
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.*;
#SuppressWarnings("serial")
public class ImageInScrollPane extends JPanel {
public static final String IMAGE_PATH = "http://image.desk7.net/"
+ "Space%20Wallpapers/1422_1280x800.jpg";
private static final int PREF_W = 500;
private static final int PREF_H = 400;
public ImageInScrollPane() throws IOException {
URL imageUrl = new URL(IMAGE_PATH);
BufferedImage img = ImageIO.read(imageUrl);
Icon icon = new ImageIcon(img);
JLabel label = new JLabel(icon);
JScrollPane scrollPane = new JScrollPane(label);
setLayout(new BorderLayout());
add(scrollPane);
}
#Override
public Dimension getPreferredSize() {
if (isPreferredSizeSet()) {
return super.getPreferredSize();
}
return new Dimension(PREF_W, PREF_H);
}
private static void createAndShowGui() {
ImageInScrollPane mainPanel = null;
try {
mainPanel = new ImageInScrollPane();
} catch (IOException e) {
e.printStackTrace();
System.exit(-1);
}
JFrame frame = new JFrame("ImageInScrollPane");
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();
}
});
}
}
You ask in comment:
what if I have to add other objects like buttons?....How do I do it?
In this situation, I'd create a class that extends JPanel and display the image in this JPanel by drawing it within the paintComponent method override (if you search on this, you'll find many examples, some by me), then add the buttons/components to this image-drawing JPanel, and then adding this JPanel into the JScrollPane's viewport as I do with the JLabel above.
I am back again. I was wondering how I would go about placing a button on top of an image in a GUI. Here is my current code:
private static JPanel titlePanel = new JPanel();
private static JLabel titleScreen = new JLabel();
private static JLabel titleScreenBackground = new JLabel();
private static JButton startGameButton = new JButton("START GAME");
private static ImageIcon titleScreenPic = new ImageIcon("http://icdn6.digitaltrends.com/image/battleship-650x0.jpg");
private static JFrame frame=new JFrame(); //creates frame
public static void main(String[] args) throws MalformedURLException{
titleScreen();
}
public static void titleScreen() throws IOException{
titleScreen.setLayout(new GridBagLayout());
titlePanel.setLayout(new GridBagLayout());
GridBagConstraints c1 = new GridBagConstraints();
c1.gridx = 0;
c1.gridy = 0;
c1.anchor = GridBagConstraints.PAGE_END;
titleScreenBackground.setIcon(titleScreenPic);
titlePanel.add(startGameButton);
titlePanel.setAlignmentY(SwingConstants.BOTTOM);
frame.add(titleScreenBackground);
frame.add(titlePanel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(630, 300); //sets appropriate size for frame
frame.setVisible(true); //makes frame visible
}
I tried to make the panel a gridbaglayout so I could place the components in the same cell, but it still places the image first and then the button directly next to it.
EDIT: I have redone the code, making it do somewhat what I wanted. As you can see, the line where I try to set the location of the button does not do anything to the button.
how I would go about placing a button on top of an image in a GUI.
If you want to place a Swing button on top of an image then you need to follow 2 steps.
set a layout manager for the label containing the image.
add the button to the label (not the panel).
See Background Panel for more information and examples.
Edit:
To center a component the easiest approach is:
label.setLayout( new GridBagLayout() );
label.add(button, new GridBagConstraints());
If you want button on the image you can just use image in paint method of JPanel.
Example (with resource im
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.GridBagLayout;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class TestFrame extends JFrame {
BackgroundPane bgPane;
private JButton startButton;
public TestFrame() {
super();
initComponents();
}
private void initComponents() {
try {
URL url = getClass().getResource("battleship-650x0.jpg");
BufferedImage image = ImageIO.read(url);
bgPane = new BackgroundPane(image);
bgPane.setLayout(new GridBagLayout());
startButton = new JButton("Start");
bgPane.add(startButton);
setContentPane(bgPane);
setDefaultCloseOperation(EXIT_ON_CLOSE);
pack();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* #param args
*/
public static void main(String[] args) {
TestFrame frame = new TestFrame();
frame.setVisible(true);
}
class BackgroundPane extends JPanel {
Image image;
public BackgroundPane(Image backGroundImage) {
super();
image = backGroundImage;
setPreferredSize(new Dimension(image.getWidth(this), image.getHeight(this)));
}
#Override
public void paint(Graphics g) {
super.paint(g);
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(image, 0, 0, null);
}
}
}
I don't know why this does not work. I have implemented an ItemListener to check if the continue button is clicked on on the SplashScreen to then switch to the MainMenu panel. When I run the code, I get the first panel with the background image and button and then when I click the button nothing happens.
Here is my Window class
package edu.ycp.cs.Main;
import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Container;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.JButton;
import javax.swing.JPanel;
public class Window implements ItemListener{
private static final long serialVersionUID = 1L;
JPanel cards; // a panel that uses CardLayout
final static String SPLASHSCREEN = "SplashScreen";
final static String MAINMENU = "MainMenu";
public void addComponentToWindow(Container pane) {
// Put the JComboBox in a JPanel to get a nicer look.
JPanel gameWindow = new JPanel(); // use FlowLayout
// Create the "cards".
JPanel card1 = new JPanel();
JButton continueButton = new JButton("Continue");
continueButton.addItemListener(this);
card1.add(new SplashScreen());
card1.add(continueButton);
JPanel card2 = new JPanel();
card2.add(new MainMenuScreen());
cards = new JPanel(new CardLayout());
cards.add(card1, SPLASHSCREEN);
cards.add(card2, MAINMENU);
pane.add(gameWindow, BorderLayout.PAGE_START);
pane.add(cards, BorderLayout.CENTER);
}
public void itemStateChanged(ItemEvent evt) {
CardLayout cl = (CardLayout) (cards.getLayout());
cl.show(cards, (String) evt.getItem());
}
}
Here is my splashscreen code
the MainMenu code is exactly the same with a different image file
package edu.ycp.cs.Main;
import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
class SplashScreen extends JPanel {
private static final long serialVersionUID = 1L;
private BufferedImage background;
public SplashScreen() {
try {
background = ImageIO.read(new File("Logo.png"));
} catch (Exception e) {
e.printStackTrace();
}
}
#Override
public Dimension getPreferredSize() {
return new Dimension(800, 600);
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (background != null) {
int x = (getWidth() - background.getWidth());
int y = (getHeight() - background.getHeight());
g.drawImage(background, x, y, this);
}
Graphics2D g2d = (Graphics2D) g;
g2d.setPaint(Color.white);
g2d.drawString("Please wait...", getWidth() / 2, getHeight() * 3 / 4);
}
}
and here is my Main
package edu.ycp.cs.Main;
import javax.swing.JFrame;
public class Main {
public static void main(String[] args) {
//Schedule a job for the event dispatch thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
makeGUI();
}
});
}
private static void makeGUI() {
// Create and set up the window.
JFrame frame = new JFrame("M&M Arcade");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Create and set up the content pane.
Window window = new Window();
window.addComponentToWindow(frame.getContentPane());
// Display the window.
frame.pack();
frame.setVisible(true);
}
}
An ItemListener will have no effect when you click on the continue JButton. Use an ActionListener instead:
continueButton.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
CardLayout cl = (CardLayout) (cards.getLayout());
cl.show(cards, MAINMENU);
}
});
Consider also using CardLayout#next for navigation.