Issues:
When I keep contentType of textpane as text/html, then the text typed moves to the right, for ex : if type "asd", then 'Message:' appears on the left and 'asd' appears on the right of the textpane
When adding a file, how do I write a HyperLinkListener for this. I've commented 'Save' and 'Cancel' in the code. How do I get the name of what I click (Cancel or Save), so that I can write appropriate code for these two links?
Code:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.text.BadLocationException;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyleContext;
import javax.swing.text.StyledDocument;
import javax.swing.text.html.HTMLDocument;
import javax.swing.text.html.HTMLEditorKit;
import javax.swing.JTextField;
import javax.swing.JTextPane;
import java.awt.FlowLayout;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.io.File;
import java.io.IOException;
import javax.swing.event.HyperlinkListener;
import javax.swing.event.HyperlinkEvent;
public class SampleTextPane extends JFrame {
private JPanel contentPane;
private JTextField textField;
private JTextPane textPane;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
SampleTextPane frame = new SampleTextPane();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public SampleTextPane() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new BorderLayout(0, 0));
setContentPane(contentPane);
JPanel panel = new JPanel();
contentPane.add(panel, BorderLayout.CENTER);
panel.setLayout(new BorderLayout(0, 0));
JPanel panel_1 = new JPanel();
panel.add(panel_1, BorderLayout.CENTER);
panel_1.setLayout(new BorderLayout(0, 0));
textPane = new JTextPane();
textPane.addHyperlinkListener(new HyperlinkListener() {
public void hyperlinkUpdate(HyperlinkEvent arg0) {
// Cancel
// To cancel the progress
// Save
// To save the file
}
});
textPane.setEditable(false);
textPane.setContentType("text/html");
panel_1.add(textPane);
JPanel panel_2 = new JPanel();
panel.add(panel_2, BorderLayout.SOUTH);
panel_2.setLayout(new BorderLayout(0, 0));
textField = new JTextField();
textField.addKeyListener(new KeyAdapter() {
#Override
public void keyPressed(KeyEvent key) {
if(key.getKeyCode()==KeyEvent.VK_ENTER){
if(!textField.getText().trim().isEmpty()){
sendMessage(textField.getText());
textField.setText("");
}
}
}
});
panel_2.add(textField);
textField.setColumns(10);
JButton btnNewButton = new JButton("+");
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
JFileChooser fileChoose = new JFileChooser();
int returnVal = fileChoose.showOpenDialog(getParent());
if(returnVal == JFileChooser.APPROVE_OPTION) {
File file = fileChoose.getSelectedFile();
String desc = file.getName().trim();
sendFileToUser(file, desc);
}
}
});
panel_2.add(btnNewButton, BorderLayout.EAST);
}
protected void sendFileToUser(File file, String desc) {
StyledDocument doc = textPane.getStyledDocument();
SimpleAttributeSet set = new SimpleAttributeSet();
StyleConstants.setForeground(set, Color.BLACK);
StyleConstants.setBold(set, true);
StyleConstants.setAlignment(set, StyleConstants.ALIGN_LEFT);
try {
doc.insertString(doc.getLength(), " File : "+desc, set);
HTMLEditorKit editorKit = (HTMLEditorKit)textPane.getEditorKit();
HTMLDocument doc1 = (HTMLDocument)textPane.getDocument();
try {
editorKit.insertHTML(doc1, doc.getLength(), "Save Cancel\n", 0, 0, null);
} catch (BadLocationException | IOException e) {
e.printStackTrace();
}
} catch (BadLocationException e) {
e.printStackTrace();
}
}
protected void sendMessage(String text) {
StyledDocument doc = textPane.getStyledDocument();
SimpleAttributeSet set = new SimpleAttributeSet();
StyleConstants.setForeground(set, Color.BLACK);
StyleConstants.setBold(set, true);
StyleConstants.setAlignment(set, StyleConstants.ALIGN_LEFT);
try {
doc.insertString(doc.getLength(), " Message : ", set);
doc.insertString(doc.getLength(), text+"\n", textPane.getStyle(StyleContext.DEFAULT_STYLE));
} catch (BadLocationException e) {
e.printStackTrace();
}
}
}
How do I get the name of what I click (Cancel or Save),
Did you specify the URL for the Hyperlink?
The JEditorPane API show an example of how to access the URL from the HyperlinkEvent.
Related
I am outputting some logs into the a JTextArea enclosed in JScrollPane but the auto scrolling functionality when the output reaches the bottom of the textArea is not working. I have attempted several methods that I saw online but none works. Below is my part of my code so far.
JTextArea ouputLogPane = new JTextArea();
JScrollPane outputPane = new JScrollPane(ouputLogPane);
outputPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
outputPane.setBounds(75, 501, 746, 108);
contentPane.add(outputPane);
Now I in another class am reading from a source file and appending log details to the textArea using the code below.
public void readFile(JTextArea outputLog, JScrollPane scrollPane){
count = 0;
while(moreLinesToRead){
if(count % 100 == 0){
outputLog.update(outputLog.getGraphics());
outputLog.append("Completed Reading"+ count + " Records "\n");
DefaultCaret caret = (DefaultCaret)outputLog.getCaret();
caret.setUpdatePolicy(DefaultCaret.ALWAYS_UPDATE);
outputLog.update(outputLog.getGraphics());
//tried the one below but did not work either
//outputLog.setCaretPosition(outputLog.getDocument().getLength());
}
count++;
}
}
Finally I am calling this method in the when a button is clicked as below.
JButton btnNewButton = new JButton("Start Reading");
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
migrationUtil.readFile(ouputLogPane,outputPane);
}
});
So basically the complete output prints only after the execution finished. I read that I might have to use a separate thread to handle it but not very sure on how to proceed.
EDIT
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.sql.Connection;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.border.LineBorder;
import javax.swing.border.TitledBorder;
public class ReadingExample extends JFrame {
private JPanel contentPane;
private Connection conn;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
ReadingExample frame = new ReadingExample();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public ReadingExample() {
//setResizable(false);
setFont(new Font("Dialog", Font.BOLD, 13));
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 936, 720);
setLocationRelativeTo(null);
contentPane = new JPanel();
contentPane.setBorder(new LineBorder(new Color(0, 0, 0), 2));
setContentPane(contentPane);
contentPane.setLayout(null);
final JTextArea ouputLogPane = new JTextArea();
final JScrollPane outputPane = new JScrollPane(ouputLogPane);
//outputPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
outputPane.setBounds(67, 189, 746, 108);
contentPane.add(outputPane);
JButton btnNewButton = new JButton("Start Reading");
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
File file = new File("file.txt");
FileReader fileReader = null;
try {
fileReader = new FileReader(file);
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
BufferedReader bufferedReader = new BufferedReader(fileReader);
String line;
try {
while((line = bufferedReader.readLine()) != null) {
ouputLogPane.append(line + "\n");
ouputLogPane.setCaretPosition(ouputLogPane.getDocument().getLength());
try {
Thread.sleep(200);
} catch (InterruptedException ee) {
ee.printStackTrace();
}
}
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
});
btnNewButton.setFont(new Font("Tahoma", Font.BOLD, 14));
btnNewButton.setBounds(358, 620, 167, 29);
contentPane.add(btnNewButton);
//JPanel panel_3 = new JPanel();
//panel_3.setBorder(new TitledBorder(null, "Process Log", TitledBorder.LEADING, TitledBorder.TOP, null, null));
//panel_3.setBounds(57, 173, 769, 132);
//contentPane.add(panel_3);
}
}
What you want to do is read the file in a separate thread, so that your Swing thread is not blocked by it, allowing you to update the text area at the same time.
You still need to update the GUI on the Swing thread however, so you do this by calling SwingUtilities.invokeLater(runnable).
Here is a working example (Note I added a Thread.sleep(200) so you can see it being updated):
import javax.swing.*;
import java.awt.*;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
public class ReadingExample {
public static void main(String[] args) {
JFrame jFrame = new JFrame();
jFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
jFrame.setLocationRelativeTo(null);
JPanel mainPanel = new JPanel(new BorderLayout());
JTextArea jTextArea = new JTextArea();
JScrollPane scrollPane = new JScrollPane(jTextArea);
scrollPane.setPreferredSize(new Dimension(300, 300));
mainPanel.add(scrollPane, BorderLayout.CENTER);
JButton btnNewButton = new JButton("Start Reading");
mainPanel.add(btnNewButton, BorderLayout.SOUTH);
jFrame.setContentPane(mainPanel);
jFrame.pack();
jFrame.setVisible(true);
btnNewButton.addActionListener(e -> {
new Thread(() -> {
File file = new File("file.txt");
try (FileReader fileReader = new FileReader(file);
BufferedReader bufferedReader = new BufferedReader(fileReader)) {
String line;
while((line = bufferedReader.readLine()) != null) {
final String fLine = line;
SwingUtilities.invokeLater(() -> {
jTextArea.append(fLine + "\n");
jTextArea.setCaretPosition(jTextArea.getDocument().getLength());
});
Thread.sleep(200);
}
} catch (Exception e1) {
e1.printStackTrace();
}
}).start();
});
}
}
There are two ways to scroll to the bottom. You can manipulate the scroll bar:
JScrollBar scrollBar = scrollPane.getVerticalScrollBar();
scrollBar.setValue(scrollBar.getMaximum());
Or, you can use the more reliable scrollRectToVisible method:
try {
textArea.scrollRectToVisible(
textArea.modelToView(
textArea.getDocument().getLength()));
} catch (BadLocationException e) {
throw new RuntimeException(e);
}
I would like my original window to close when someone enters the password and a new one to pop up, or if you have a better recommendation please tell me. Here is my code,
The main class,
package notebook;
import java.awt.EventQueue;
import java.awt.Image;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.ImageIcon;
import javax.swing.JDialog;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.border.CompoundBorder;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.image.BufferedImage;
public class mainPage extends JDialog {
private JTextField textField;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
mainPage frame = new mainPage();
frame.setVisible(true);
frame.setResizable(false);
Image icon = new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB_PRE);
frame.setIconImage(icon);
frame.setTitle("Notebook");
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
* #throws IOException
*/
public mainPage() throws IOException {
setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
setBounds(100, 100, 560, 390);
JLabel contentPane = new JLabel(
new ImageIcon(
ImageIO.read(new File(
"C:\\Users\\Gianmarco\\workspace\\notebook\\src\\notebook\\cool_cat.jpg"))));
contentPane.setBorder(new CompoundBorder());
setContentPane(contentPane);
contentPane.setLayout(null);
JLabel lblEnterPassword = new JLabel(" Enter Password");
lblEnterPassword.setForeground(Color.LIGHT_GRAY);
lblEnterPassword.setBackground(Color.DARK_GRAY);
lblEnterPassword.setOpaque(true);
lblEnterPassword.setBounds(230, 60, 100, 15);
contentPane.add(lblEnterPassword);
security sInfo = new security();
textField = new JPasswordField(10);
nbTab notebook = new nbTab();
Action action = new AbstractAction()
{
#Override
public void actionPerformed(ActionEvent e)
{
String textFieldValue = textField.getText();
if (sInfo.checkPassword(textFieldValue)){
System.out.println("working");
notebook.setVisible(true);
//dispose();
}
}
};
JPanel panel = new JPanel();
textField.setBounds(230, 85, 100, 15);
contentPane.add(textField);
contentPane.add(panel);
textField.setColumns(10);
textField.addActionListener(action);
}
}
The password class,
package notebook;
public class security {
private String password = "kitten";
protected boolean checkPassword(String x){
if(x.length()<15 && x.equals(password)) return true;
return false;
}
}
The JTabbedPane class,
package notebook;
import javax.swing.JTabbedPane;
import javax.swing.JEditorPane;
import javax.swing.JList;
import javax.swing.JButton;
public class nbTab<E> extends JTabbedPane {
/**
*
*/
private static final long serialVersionUID = 1L;
/**
* Create the panel.
*/
public nbTab() {
JEditorPane editorPane = new JEditorPane();
JButton btnNewButton = new JButton("New button");
btnNewButton.setBounds(480, 345, 40, 30);
editorPane.add(btnNewButton);
editorPane.setBounds(80, 45, 400, 300);
addTab("New tab", null, editorPane, null);
JList<? extends E> list = new JList();
addTab("New tab", null, list, null);
}
}
In my main class, on lines 76 - 82 (where the action event listner is located) I would like to have my current window close and a new window of notebook to open. I used dispose() to close the password window. Then I try to open the JTabbedPane with setVisible(), setSelectedComponent, and setSelectedIndex however I am either using them incorrectly or there must be some better way to do this because it is not working. Any advice is appreciated guys thanks for all help.
As already suggested by MadProgrammer and Frakcool, the CardLayout layout manager is an interesting option in your case. A nice introduction to several Layout Managers for Swing is available here: A Visual Guide to Layout Managers.
You can use the code below to get an idea of how it could work. I have made a few modifications to your main application class:
The main class now extends from JFrame (instead of JDialog).
A few more panels and layout managers are used.
In Java class names usually start with a capital letter, so I have renamed your classes to MainPage, NotebookTab, and Security.
Here is the modified MainPage class:
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.*;
import javax.imageio.*;
import javax.swing.*;
public class MainPage extends JFrame {
private static final String LOGIN_PANEL_ID = "Login panel";
private static final String NOTEBOOK_ID = "Notebook tabbed pane";
private JPanel mainPanel;
private CardLayout cardLayout;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
MainPage frame = new MainPage();
frame.setResizable(false);
Image icon = new BufferedImage(1, 1,
BufferedImage.TYPE_INT_ARGB_PRE);
frame.setIconImage(icon);
frame.setTitle("Notebook");
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
* #throws IOException
*/
public MainPage() throws IOException {
setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
setBounds(100, 100, 560, 390);
cardLayout = new CardLayout();
mainPanel = new JPanel(cardLayout);
mainPanel.add(createLoginPanel(), LOGIN_PANEL_ID);
mainPanel.add(new NotebookTab(), NOTEBOOK_ID);
getContentPane().add(mainPanel);
}
private JPanel createLoginPanel() throws IOException {
JPanel loginPanel = new JPanel(new BorderLayout());
JPanel passwordPanel = new JPanel();
passwordPanel.setLayout(new BoxLayout(passwordPanel, BoxLayout.PAGE_AXIS));
JLabel lblEnterPassword = new JLabel("Enter Password");
lblEnterPassword.setForeground(Color.LIGHT_GRAY);
lblEnterPassword.setBackground(Color.DARK_GRAY);
lblEnterPassword.setOpaque(true);
lblEnterPassword.setHorizontalAlignment(SwingConstants.CENTER);
lblEnterPassword.setMaximumSize(new Dimension(100, 16));
lblEnterPassword.setAlignmentX(Component.CENTER_ALIGNMENT);
JTextField textField = new JPasswordField(10);
textField.setMaximumSize(new Dimension(100, 16));
textField.setAlignmentX(Component.CENTER_ALIGNMENT);
passwordPanel.add(Box.createRigidArea(new Dimension(0, 42)));
passwordPanel.add(lblEnterPassword);
passwordPanel.add(Box.createRigidArea(new Dimension(0, 10)));
passwordPanel.add(textField);
loginPanel.add(passwordPanel, BorderLayout.NORTH);
Action loginAction = new AbstractAction() {
#Override
public void actionPerformed(ActionEvent e) {
if (new Security().checkPassword(textField.getText())) {
System.out.println("working");
cardLayout.show(mainPanel, NOTEBOOK_ID);
}
}
};
textField.addActionListener(loginAction);
String imagePath = "C:\\Users\\Gianmarco\\workspace\\" +
"notebook\\src\\notebook\\cool_cat.jpg";
BufferedImage bufferedImage = ImageIO.read(new File(imagePath));
JLabel imageLabel = new JLabel(new ImageIcon(bufferedImage));
loginPanel.add(imageLabel, BorderLayout.CENTER);
return loginPanel;
}
}
I want to convert my project that extends JFrame in an applet in order to run it on a web page. Can someone help me and tell me how I can do this?
Post here a fragment code of the project:
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import javax.swing.JButton;
import CLIPSJNI.Environment;
import CLIPSJNI.PrimitiveValue;
import javax.swing.JTextPane;
import java.awt.Font;
import java.awt.event.MouseEvent;
import java.util.StringTokenizer;
import java.awt.Color;
import javax.swing.SwingConstants;
import javax.swing.JScrollPane;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class Progetto extends JFrame {
static Object ProfileData[] = new Object[30];
static Environment clips=new Environment();
static PrimitiveValue rv;
static String a="?*send*";
private JPanel contentPane;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
clips.load("prova.clp");
clips.reset();
clips.run();
Progetto frame = new Progetto();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
* #throws Exception
*/
public Progetto() throws Exception {
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 30, 662, 671);
contentPane = new JPanel();
contentPane.setBackground(Color.LIGHT_GRAY);
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
rv=clips.eval(a);
ProfileData=(Object[]) Progetto.codificaCodice(rv.stringValue());
System.out.println((String) Progetto.ProfileData[0]);
JLabel lblTravel = new JLabel("Travel Recommender");
lblTravel.setForeground(new Color(204, 0, 0));
lblTravel.setFont(new Font("Trebuchet MS", Font.BOLD | Font.ITALIC, 30));
lblTravel.setHorizontalAlignment(SwingConstants.CENTER);
lblTravel.setBounds(-29, 11, 636, 49);
contentPane.add(lblTravel);
JButton range1 = new JButton("0 - 18");
range1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
}
});
range1.setForeground(Color.BLACK);
range1.setFont(new Font("Trebuchet MS", Font.PLAIN, 15));
range1.setBackground(Color.CYAN);
range1.setBounds(176, 221, 89, 31);
contentPane.add(range1);
JTextPane txtpnFsd = new JTextPane();
txtpnFsd.setToolTipText("");
contentPane.add(txtpnFsd);
txtpnFsd.setForeground(Color.BLACK);
txtpnFsd.setBackground(Color.LIGHT_GRAY);
txtpnFsd.setFont(new Font("Trebuchet MS", Font.BOLD | Font.ITALIC, 15));
txtpnFsd.setEditable(false);
txtpnFsd.setBounds(213, 134, 139, 76);
txtpnFsd.setText((String) ProfileData[0]);
range1.addMouseListener(new java.awt.event.MouseAdapter(){
public void mouseClicked(MouseEvent e){
Progetto.clips.eval((String) Progetto.ProfileData[1]); //assert 0-18
Progetto.clips.run();
Progetto.rv=Progetto.clips.eval(a);
try {
Progetto.ProfileData=(Object[]) Progetto.codificaCodice(Progetto.rv.stringValue());
System.out.println((String) Progetto.ProfileData[0]);
} catch (Exception e1) {
e1.printStackTrace();
}
Lavoro frame = null;
try {
frame= new Lavoro();
} catch (Exception e1) {
e1.printStackTrace();
}
frame.setVisible(true);
dispose();
}
});
......
public static Object codificaCodice(String message) {
Object token = null;
int count = 0;
Object ProfileData[] = new Object[30];
for(StringTokenizer st = new StringTokenizer(message, "%"); st.hasMoreTokens(); count++)
{
token = st.nextToken();
ProfileData[count] = (String) token;
}
return ProfileData;
}
}
I don't know why my scroll bar in text area doesn't work. I found many solutions in internet, but no 1 helped for me.
textArea1 = new JTextArea();
textArea1.setBounds(13, 28, 182, 199);
panel.add(textArea1);
JScrollBar scrollBar = new JScrollBar();
scrollBar.setBounds(205, 1, 17, 242);
panel.add(scrollBar);
I found that can't be Panel's layout Absolute, if I change It to Group layout the same.
What's wrong? Could you help me? Thank you.
UPDATED:
package lt.kvk.i3_2.kalasnikovas_stanislovas;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.BorderLayout;
import javax.swing.JTextPane;
import javax.swing.DropMode;
import javax.swing.JFormattedTextField;
import java.awt.Component;
import javax.swing.Box;
import java.awt.Dimension;
import javax.swing.JTextField;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Toolkit;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
import javax.swing.JMenuItem;
import javax.swing.LayoutStyle.ComponentPlacement;
import javax.swing.ImageIcon;
import javax.swing.JDesktopPane;
import java.awt.SystemColor;
import java.awt.Font;
import javax.swing.border.BevelBorder;
import javax.swing.border.EtchedBorder;
import javax.swing.JScrollBar;
import java.awt.Color;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;
import javax.swing.JLabel;
import javax.swing.JToolBar;
public class KDVizualizuotas {
private JFrame frmInformacijaApieMuzikos;
private JTextField txtStilius;
private JTextArea textArea1;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
KDVizualizuotas window = new KDVizualizuotas();
window.frmInformacijaApieMuzikos.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public KDVizualizuotas() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frmInformacijaApieMuzikos = new JFrame();
frmInformacijaApieMuzikos.setResizable(false);
frmInformacijaApieMuzikos.setIconImage(Toolkit.getDefaultToolkit().getImage(KDVizualizuotas.class.getResource("/lt/kvk/i3_2/kalasnikovas_stanislovas/resources/Sidebar-Music-Blue-icon.png")));
frmInformacijaApieMuzikos.setTitle("Muzikos stiliai");
frmInformacijaApieMuzikos.setBounds(100, 100, 262, 368);
frmInformacijaApieMuzikos.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
txtStilius = new JTextField();
txtStilius.setBounds(10, 34, 128, 20);
txtStilius.setColumns(10);
JButton btnIekoti = new JButton("Ie\u0161koti");
btnIekoti.setBounds(146, 36, 89, 19);
btnIekoti.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
// textArea1.append(txtStilius.getText()+"\n");
// txtStilius.getText();
Scanner input = new Scanner(System.in);
try {
FileReader fr = new FileReader("src/lt/kvk/i3_2/kalasnikovas_stanislovas/Stiliai.txt");
BufferedReader br = new BufferedReader(fr);
String stiliuSarasas;
while((stiliuSarasas = br.readLine()) != null) {
System.out.println(stiliuSarasas);
textArea1.append(stiliuSarasas+"\n");
}
fr.close();
}
catch (IOException e) {
System.out.println("Error:" + e.toString());
}
}
});
JPanel panel = new JPanel();
panel.setBounds(10, 65, 224, 243);
panel.setBorder(new EtchedBorder(EtchedBorder.LOWERED, null, null));
panel.setBackground(SystemColor.text);
JLabel lblveskiteMuzikosStili = new JLabel("\u012Eveskite muzikos stili\u0173:");
lblveskiteMuzikosStili.setBounds(10, 14, 222, 14);
frmInformacijaApieMuzikos.getContentPane().setLayout(null);
panel.setLayout(null);
frmInformacijaApieMuzikos.getContentPane().add(panel);
JLabel lblInformacijaApieMuzikos = new JLabel("Informacija apie muzikos stili\u0173:");
lblInformacijaApieMuzikos.setBounds(12, 3, 190, 14);
panel.add(lblInformacijaApieMuzikos);
textArea1 = new JTextArea();
textArea1.setBounds(13, 28, 182, 199);
panel.add(textArea1);
JScrollBar scrollBar = new JScrollBar();
scrollBar.setBounds(205, 1, 17, 242);
panel.add(scrollBar);
frmInformacijaApieMuzikos.getContentPane().add(txtStilius);
frmInformacijaApieMuzikos.getContentPane().add(btnIekoti);
frmInformacijaApieMuzikos.getContentPane().add(lblveskiteMuzikosStili);
JMenuBar menuBar = new JMenuBar();
frmInformacijaApieMuzikos.setJMenuBar(menuBar);
JMenu mnFile = new JMenu("File");
menuBar.add(mnFile);
JMenuItem mntmExit = new JMenuItem("Exit");
mntmExit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
System.exit(0);
}
});
mntmExit.setIcon(new ImageIcon(KDVizualizuotas.class.getResource("/lt/kvk/i3_2/kalasnikovas_stanislovas/resources/exitas.png")));
mnFile.add(mntmExit);
JMenu mnEdit = new JMenu("Edit");
menuBar.add(mnEdit);
JMenu mnHelp = new JMenu("Help");
menuBar.add(mnHelp);
JMenuItem mntmHelp = new JMenuItem("Help");
mnHelp.add(mntmHelp);
JMenu mnAbout = new JMenu("About");
menuBar.add(mnAbout);
JMenuItem mntmAbout = new JMenuItem("About");
mntmAbout.setIcon(new ImageIcon(KDVizualizuotas.class.getResource("/lt/kvk/i3_2/kalasnikovas_stanislovas/resources/questionmark.png")));
mnAbout.add(mntmAbout);
}
}
You need to add the component you want to be contained within the scroll pane to it.
You can do this via the JScrollPane's constructor or JScrollPane#setViewportView method
public class ScrollPaneTest {
public static void main(String[] args) {
new ScrollPaneTest();
}
public ScrollPaneTest() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception ex) {
}
JPanel bigPane = new JPanel();
bigPane.setBackground(Color.BLUE);
// This is not recommended, but is used for demonstration purposes
bigPane.setPreferredSize(new Dimension(1024, 768));
JScrollPane scrollPane = new JScrollPane(bigPane);
scrollPane.setPreferredSize(new Dimension(400, 400));
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(scrollPane);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
Updated with proper layout
You should avoid null or absolute layouts, they will only hurt you in the long wrong.
You may also find How to use Scroll Panes of use
public class BadLayout {
public static void main(String[] args) {
new BadLayout();
}
public BadLayout() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception ex) {
}
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JTextField searchField;
private JButton searchButton;
private JTextArea searchResults;
public TestPane() {
setLayout(new BorderLayout());
searchResults = new JTextArea();
searchResults.setLineWrap(true);
searchResults.setWrapStyleWord(true);
JScrollPane scrollPane = new JScrollPane(searchResults);
JPanel results = new JPanel(new BorderLayout());
results.setBorder(new EmptyBorder(4, 8, 8, 8));
results.add(scrollPane);
add(results);
JPanel search = new JPanel(new GridBagLayout());
search.setBorder(new EmptyBorder(8, 8, 4, 8));
searchField = new JTextField(12);
searchButton = new JButton("Search");
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.weightx = 1;
gbc.insets = new Insets(0, 0, 0, 4);
search.add(searchField, gbc);
gbc.insets = new Insets(0, 0, 0, 0);
gbc.gridx++;
gbc.fill = GridBagConstraints.NONE;
gbc.weightx = 0;
search.add(searchButton, gbc);
add(search, BorderLayout.NORTH);
}
#Override
public Dimension getPreferredSize() {
return new Dimension(200, 400);
}
}
}
My problem here is,
after clicking Browse button it displays all files in a directory to choose,
then the chosen image is displayed in GUI correctly. But When i click Browse button
for the second time, it shows the old image only instead of showing the new one. Please help me in this.
For reference, i uploaded the UI.
package GUI;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Graphics2D;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
#SuppressWarnings("serial")
public class MainAppFrame extends JFrame {
private JPanel contentPane;
File targetFile;
BufferedImage targetImg;
public JPanel panel,panel_1;
private static final int baseSize = 128;
private static final String basePath =
"C:\\Documents and Settings\\Administrator\\Desktop\\Images";
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
MainAppFrame frame = new MainAppFrame();
frame.setVisible(true);
frame.setResizable(false);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public MainAppFrame() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 550, 400);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(new BorderLayout(0, 0));
panel = new JPanel();
panel.setBorder(new javax.swing.border.LineBorder(new java.awt.Color(0, 0, 0), 1, true));
contentPane.add(panel, BorderLayout.WEST);
JButton btnBrowse = new JButton("Browse");
btnBrowse.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
browseButtonActionPerformed(e);
}
});
JLabel lblSelectTargetPicture = new JLabel("Select target picture..");
JButton btnDetect = new JButton("Detect");
btnDetect.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}
});
JButton btnAddDigit = new JButton("Add Digit");
btnAddDigit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}
});
JButton button = new JButton("Recognize");
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}
});
panel_1 = new JPanel();
panel_1.setBorder(new javax.swing.border.LineBorder(new java.awt.Color(0, 0, 0), 1, true));
GroupLayout gl_panel = new GroupLayout(panel);
gl_panel.setHorizontalGroup(
gl_panel.createParallelGroup(Alignment.LEADING)
.addGroup(gl_panel.createSequentialGroup()
.addGap(6)
.addGroup(gl_panel.createParallelGroup(Alignment.LEADING)
.addGroup(gl_panel.createSequentialGroup()
.addComponent(lblSelectTargetPicture)
.addGap(6)
.addComponent(btnBrowse))
.addGroup(gl_panel.createSequentialGroup()
.addGap(10)
.addComponent(btnDetect)
.addGap(18)
.addComponent(btnAddDigit))))
.addGroup(gl_panel.createSequentialGroup()
.addGap(50)
.addComponent(button))
.addGroup(gl_panel.createSequentialGroup()
.addContainerGap()
.addComponent(panel_1, GroupLayout.PREFERRED_SIZE, 182, GroupLayout.PREFERRED_SIZE))
);
gl_panel.setVerticalGroup(
gl_panel.createParallelGroup(Alignment.LEADING)
.addGroup(gl_panel.createSequentialGroup()
.addGroup(gl_panel.createParallelGroup(Alignment.LEADING)
.addGroup(gl_panel.createSequentialGroup()
.addGap(7)
.addComponent(lblSelectTargetPicture))
.addGroup(gl_panel.createSequentialGroup()
.addGap(3)
.addComponent(btnBrowse)))
.addGap(18)
.addComponent(panel_1, GroupLayout.PREFERRED_SIZE, 199, GroupLayout.PREFERRED_SIZE)
.addGap(22)
.addGroup(gl_panel.createParallelGroup(Alignment.BASELINE)
.addComponent(btnDetect)
.addComponent(btnAddDigit))
.addGap(18)
.addComponent(button)
.addContainerGap())
);
panel.setLayout(gl_panel);
}
public BufferedImage rescale(BufferedImage originalImage)
{
BufferedImage resizedImage = new BufferedImage(baseSize, baseSize, BufferedImage.TYPE_INT_RGB);
Graphics2D g = resizedImage.createGraphics();
g.drawImage(originalImage, 0, 0, baseSize, baseSize, null);
g.dispose();
return resizedImage;
}
public void setTarget(File reference)
{
try {
targetFile = reference;
targetImg = rescale(ImageIO.read(reference));
} catch (IOException ex) {
Logger.getLogger(MainAppFrame.class.getName()).log(Level.SEVERE, null, ex);
}
panel_1.setLayout(new BorderLayout(0, 0));
panel_1.add(new JLabel(new ImageIcon(targetImg)));
setVisible(true);
}
private void browseButtonActionPerformed(java.awt.event.ActionEvent evt) {
JFileChooser fc = new JFileChooser(basePath);
fc.setFileFilter(new JPEGImageFileFilter());
int res = fc.showOpenDialog(null);
// We have an image!
try {
if (res == JFileChooser.APPROVE_OPTION) {
File file = fc.getSelectedFile();
setTarget(file);
} // Oops!
else {
JOptionPane.showMessageDialog(null,
"You must select one image to be the reference.", "Aborting...",
JOptionPane.WARNING_MESSAGE);
}
} catch (Exception iOException) {
}
}
}
//JPEGImageFileFilter.java
package GUI;
import java.io.File;
import javax.swing.filechooser.FileFilter;
/*
* This class implements a generic file name filter that allows the listing/selection
* of JPEG files.
*/
public class JPEGImageFileFilter extends FileFilter implements java.io.FileFilter
{
public boolean accept(File f)
{
if (f.getName().toLowerCase().endsWith(".jpeg")) return true;
if (f.getName().toLowerCase().endsWith(".jpg")) return true;
if(f.isDirectory())return true;
return false;
}
public String getDescription()
{
return "JPEG files";
}
}
Each time a new image is selected, you're creating components unnecessarily and in error here:
public void setTarget(File reference) {
//....
panel_1.setLayout(new BorderLayout(0, 0));
panel_1.add(new JLabel(new ImageIcon(targetImg)));
setVisible(true);
Instead I would recommend that you have all these components created from the get-go, before any file/image has been selected, and then in this method, create an ImageIcon from the Image, and then simply use this Icon to set the Icon of an already existng JLabel rather than a new JLabel. This is done simply by calling myLabel.setIcon(new ImageIcon(targetImg));
Create an ImageViewer with method like ImageViewer.setImage(Image), display the image in a JLabel.
ImageViewer
import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import java.util.Random;
public class ImageViewer {
JPanel gui;
/** Displays the image. */
JLabel imageCanvas;
/** Set the image as icon of the image canvas (display it). */
public void setImage(Image image) {
imageCanvas.setIcon(new ImageIcon(image));
}
public void initComponents() {
if (gui==null) {
gui = new JPanel(new BorderLayout());
gui.setBorder(new EmptyBorder(5,5,5,5));
imageCanvas = new JLabel();
JPanel imageCenter = new JPanel(new GridBagLayout());
imageCenter.add(imageCanvas);
JScrollPane imageScroll = new JScrollPane(imageCenter);
imageScroll.setPreferredSize(new Dimension(300,100));
gui.add(imageScroll, BorderLayout.CENTER);
}
}
public Container getGui() {
initComponents();
return gui;
}
public static Image getRandomImage(Random random) {
int w = 100 + random.nextInt(400);
int h = 50 + random.nextInt(200);
BufferedImage bi = new BufferedImage(
w,h,BufferedImage.TYPE_INT_RGB);
return bi;
}
public static void main(String[] args) throws Exception {
Runnable r = new Runnable() {
#Override
public void run() {
JFrame f = new JFrame("Image Viewer");
// TODO Fix kludge to kill the Timer
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final ImageViewer viewer = new ImageViewer();
f.setContentPane(viewer.getGui());
f.pack();
f.setLocationByPlatform(true);
f.setVisible(true);
ActionListener animate = new ActionListener() {
Random random = new Random();
#Override
public void actionPerformed(ActionEvent arg0) {
viewer.setImage(getRandomImage(random));
}
};
Timer timer = new Timer(1500,animate);
timer.start();
}
};
SwingUtilities.invokeLater(r);
}
}
I modified your code , I hope it will fulfill your requirement. I use MigLayout (it is a Layout manager) to arrange the component.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.BoxLayout;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import net.miginfocom.swing.MigLayout;
public class MyFileChooser
{
JFrame frame;
JPanel panel;
JButton btnBrowse;
JButton change;
JLabel imglabel;
File targetFile;
BufferedImage targetImg;
private static final int baseSize = 128;
private static final String basePath ="/images/fimage";
JPanel panel_1;
ImageIcon icon;
public MyFileChooser()
{
// TODO Auto-generated constructor stub
frame =new JFrame();
frame.setLayout(new MigLayout());
frame.setSize(300, 300);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
panel=new JPanel(new MigLayout());
panel_1 = new JPanel();
panel_1.setBorder(new javax.swing.border.LineBorder(new java.awt.Color(5, 5, 5), 1, true));
panel_1.setBackground(Color.pink);
btnBrowse=new JButton("browse");
btnBrowse.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
browseButtonActionPerformed(e);
}
});
change=new JButton("Delete");
change.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e)
{
// TODO Auto-generated method stub
changeButtonActionPerformed(e);
}
private void changeButtonActionPerformed(ActionEvent e)
{
// TODO Auto-generated method stub
imglabel.revalidate(); //ADD THIS AS WELL
imglabel.repaint(); //ADD THIS AS WELL
imglabel.setIcon(null);
System.out.println("delete button activated");
}
});
imglabel=new JLabel("Image");
imglabel.setSize(100, 100);
imglabel.setBackground(Color.yellow);
frame.add(panel_1,"span,pushx,pushy,growx,growy");
frame.add(btnBrowse);
frame.add(change,"");
//frame.pack();
}
protected void browseButtonActionPerformed(ActionEvent e)
{
JFileChooser fc = new JFileChooser(basePath);
fc.setFileFilter(new JPEGImageFileFilter());
int res = fc.showOpenDialog(null);
// We have an image!
try {
if (res == JFileChooser.APPROVE_OPTION) {
File file = fc.getSelectedFile();
imglabel.setIcon(null);
setTarget(file);
} // Oops!
else {
JOptionPane.showMessageDialog(null,
"You must select one image to be the reference.", "Aborting...",
JOptionPane.WARNING_MESSAGE);
}
} catch (Exception iOException) {
}
}
public BufferedImage rescale(BufferedImage originalImage)
{
BufferedImage resizedImage = new BufferedImage(baseSize, baseSize, BufferedImage.TYPE_INT_RGB);
Graphics2D g = resizedImage.createGraphics();
g.drawImage(originalImage, 0, 0, baseSize, baseSize, null);
g.dispose();
return resizedImage;
}
public void setTarget(File reference)
{
try {
targetFile = reference;
targetImg = rescale(ImageIO.read(reference));
} catch (IOException ex) {
// Logger.getLogger(MainAppFrame.class.getName()).log(Level.SEVERE, null, ex);
}
panel_1.setLayout(new BorderLayout(0, 0));
icon=new ImageIcon(targetImg);
imglabel=new JLabel(icon);
panel_1.add(imglabel);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
// TODO Auto-generated method stub
new MyFileChooser();
}
});
}
}
JPEGImageFileFilter class , you can keep this class in same pakage
import java.io.File;
import javax.swing.filechooser.FileFilter;
public class JPEGImageFileFilter extends FileFilter implements FileFilter
{
public boolean accept(File f)
{
if (f.getName().toLowerCase().endsWith(".jpeg")) return true;
if (f.getName().toLowerCase().endsWith(".jpg")) return true;
if(f.isDirectory())return true;
return false;
}
public String getDescription()
{
return "JPEG files";
}
}