How to create an event handler for JLabel?

Question

I want to make it so that if I click on JLabel, the label will become a new label with another image attached to it.

So far, my code looks like this:

public class Picture extends JFrame { private ImageIcon _image1; private ImageIcon _image2; private JLabel _mainLabel; private JLabel _mainLabel2; public Picture(){ _image1 = new ImageIcon("src/classes/picture1.jpg"); _image2 = new ImageIcon("src/classes/picture2.jpg"); _mainLabel = new JLabel(_image1); _mainLabel2 = new JLabel(_image2); add(_mainLabel); pack(); setVisible(true); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } } 

Answer 1

Add a mouseListener to the JLable and to the mouseClicked(mouseEvent) icon of the mouseClicked(mouseEvent) method change.

An example code could be:

  jLabel.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { jLabel.setIcon(newIcon); } }); 

Answer 2

Try using JToggleButton . There is no need for a MouseListener and responds to keyboard input.

 import javax.swing.*; import javax.imageio.ImageIO; import java.net.URL; import java.awt.Image; class ToggleImage { public static void main(String[] args) throws Exception { URL url1 = new URL("http://pscode.org/media/stromlo1.jpg"); URL url2 = new URL("http://pscode.org/media/stromlo2.jpg"); final Image image1 = ImageIO.read(url1); final Image image2 = ImageIO.read(url2); SwingUtilities.invokeLater(new Runnable() { public void run() { JToggleButton button = new JToggleButton(); button.setIcon(new ImageIcon(image1)); button.setSelectedIcon(new ImageIcon(image2)); button.setBorderPainted(false); button.setContentAreaFilled(false); JOptionPane.showMessageDialog(null, button); } }); } } 

Old code - before I realized that we are talking about images

I want to make sure that if I click on JLabel

What about people who are “challenging”? Use a JTextField instead. Paste any link and press Enter to activate.

 import java.awt.Desktop; import java.awt.Color; import java.awt.Cursor; import java.awt.BorderLayout; import java.awt.GridLayout; import java.awt.event.*; import javax.swing.JTextField; import javax.swing.JPanel; import javax.swing.JOptionPane; import javax.swing.SwingUtilities; import javax.swing.border.MatteBorder; import javax.swing.border.Border; import java.net.URI; import java.io.File; /** A Java 1.6+ LinkLabel that uses the Desktop class for opening the document of interest. The Desktop.browse(URI) method can be invoked from applications, applets and apps. launched using Java Webstart. In the latter two cases, the usual fall-back methods are used for sandboxed apps (see the JavaDocs for further details). While called a 'label', this class actually extends JTextField, to easily allow the component to become focusable using keyboard navigation. To successfully browse to a URI for a local File, the file name must be constructed using a canonical path. @author Andrew Thompson @version 2008/08/23 */ public class LinkLabel // we extend a JTextField, to get a focusable component extends JTextField implements MouseListener, FocusListener, ActionListener { /** The target or href of this link. */ private URI target; public Color standardColor = new Color(0,0,255); public Color hoverColor = new Color(255,0,0); public Color activeColor = new Color(128,0,128); public Color transparent = new Color(0,0,0,0); public boolean underlineVisible = true; private Border activeBorder; private Border hoverBorder; private Border standardBorder; /** Construct a LinkLabel that points to the given target. The URI will be used as the link text.*/ public LinkLabel(URI target) { this( target, target.toString() ); } /** Construct a LinkLabel that points to the given target, and displays the text to the user. */ public LinkLabel(URI target, String text) { super(text); this.target = target; } /* Set the active color for this link (default is purple). */ public void setActiveColor(Color active) { activeColor = active; } /* Set the hover/focused color for this link (default is red). */ public void setHoverColor(Color hover) { hoverColor = hover; } /* Set the standard (non-focused, non-active) color for this link (default is blue). */ public void setStandardColor(Color standard) { standardColor = standard; } /** Determines whether the */ public void setUnderlineVisible(boolean underlineVisible) { this.underlineVisible = underlineVisible; } /* Add the listeners, configure the field to look and act like a link. */ public void init() { this.addMouseListener(this); this.addFocusListener(this); this.addActionListener(this); setToolTipText(target.toString()); if (underlineVisible) { activeBorder = new MatteBorder(0,0,1,0,activeColor); hoverBorder = new MatteBorder(0,0,1,0,hoverColor); standardBorder = new MatteBorder(0,0,1,0,transparent); } else { activeBorder = new MatteBorder(0,0,0,0,activeColor); hoverBorder = new MatteBorder(0,0,0,0,hoverColor); standardBorder = new MatteBorder(0,0,0,0,transparent); } // make it appear like a label/link setEditable(false); setForeground(standardColor); setBorder(standardBorder); setCursor( new Cursor(Cursor.HAND_CURSOR) ); } /** Browse to the target URI using the Desktop.browse(URI) method. For visual indication, change to the active color at method start, and return to the standard color once complete. This is usually so fast that the active color does not appear, but it will take longer if there is a problem finding/loading the browser or URI (eg for a File). */ public void browse() { setForeground(activeColor); setBorder(activeBorder); try { Desktop.getDesktop().browse(target); } catch(Exception e) { e.printStackTrace(); } setForeground(standardColor); setBorder(standardBorder); } /** Browse to the target. */ public void actionPerformed(ActionEvent ae) { browse(); } /** Browse to the target. */ public void mouseClicked(MouseEvent me) { browse(); } /** Set the color to the hover color. */ public void mouseEntered(MouseEvent me) { setForeground(hoverColor); setBorder(hoverBorder); } /** Set the color to the standard color. */ public void mouseExited(MouseEvent me) { setForeground(standardColor); setBorder(standardBorder); } public void mouseReleased(MouseEvent me) {} public void mousePressed(MouseEvent me) {} /** Set the color to the standard color. */ public void focusLost(FocusEvent fe) { setForeground(standardColor); setBorder(standardBorder); } /** Set the color to the hover color. */ public void focusGained(FocusEvent fe) { setForeground(hoverColor); setBorder(hoverBorder); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { try { File f = new File(".","LinkLabel.java"); /* Filename must be constructed with a canonical path in order to successfully use Desktop.browse(URI)! */ f = new File(f.getCanonicalPath()); JPanel p = new JPanel(new GridLayout(0,1)); URI uriFile = f.toURI(); LinkLabel linkLabelFile = new LinkLabel(uriFile); linkLabelFile.init(); p.add(linkLabelFile); LinkLabel linkLabelWeb = new LinkLabel( new URI("http://pscode.org/sscce.html"), "SSCCE"); linkLabelWeb.setStandardColor(new Color(0,128,0)); linkLabelWeb.setHoverColor(new Color(222,128,0)); linkLabelWeb.init(); /* This shows a quirk of the LinkLabel class, the size of the text field needs to be constrained to get the underline to appear properly. */ p.add(linkLabelWeb); LinkLabel linkLabelConstrain = new LinkLabel( new URI("http://stackoverflow.com/"), "Stack Overflow"); linkLabelConstrain.init(); /* ..and this shows one way to constrain the size (appropriate for this layout). Similar tricks can be used to ensure the underline does not drop too far *below* the link (think BorderLayout NORTH/SOUTH). The same technique can also be nested further to produce a NORTH+EAST packing (for example). */ JPanel labelConstrain = new JPanel(new BorderLayout()); labelConstrain.add( linkLabelConstrain, BorderLayout.EAST ); p.add(labelConstrain); LinkLabel linkLabelNoUnderline = new LinkLabel( new URI("http://java.net/"), "java.net"); // another way to deal with the underline is to remove it linkLabelNoUnderline.setUnderlineVisible(false); // we can use the methods inherited from JTextField linkLabelNoUnderline. setHorizontalAlignment(JTextField.CENTER); linkLabelNoUnderline.init(); p.add(linkLabelNoUnderline); JOptionPane.showMessageDialog( null, p ); } catch(Exception e) { e.printStackTrace(); } } }); } } 

Answer 3

You cannot just add actionListener, you need to implement MouseListener , something like this .

Answer 4

If you're looking for Customized JLable with different fonts and sizes, and mouse action listeners just go through this.

This is fully tested using the following tasks

1.JLabel with image and text.

2. Label with mice.

3. Move the action with the replacement of the image and text.

 public class CustomJLabel extends JLabel implements MouseListener { private Color color; private int width=0; private int height=0; private ImageIcon normal_icon; private ImageIcon hover_icon; private ImageIcon icon_Label; JLabel label; private boolean isMatch; public CustomJLabel(ImageIcon icon,ImageIcon icon1, String text, int i, int j) { this.normal_icon=icon; this.hover_icon=icon1; this.icon_Label=normal_icon; setFont(new Font("Tw Cen MT", Font.TYPE1_FONT, 16)); setForeground(Color.WHITE); setOpaque(false); setHorizontalAlignment( SwingConstants.CENTER ); setText(text); addMouseListener(this) ; } public CustomJLabel(ImageIcon icon,ImageIcon icon1, int i, int j) { this.normal_icon=icon; this.hover_icon=icon1; this.icon_Label=normal_icon; setText(""); setVerticalAlignment( SwingConstants.CENTER); setForeground(Color.WHITE); setOpaque(false); addMouseListener(this) ; } public CustomJLabel(ImageIcon icon,ImageIcon icon1, String text, int i, int j,Font f) { this.normal_icon=icon; this.hover_icon=icon1; this.icon_Label=normal_icon; this.width=i; this.height=j; setFont(f); setForeground(Color.WHITE); setOpaque(false); setText(text); setVerticalAlignment( SwingConstants.TOP); addMouseListener(this) ; } public int getIconWidth(){ return width; } public int getIconHeight(){ return height; } @Override public void paintComponent(Graphics g) { if(this.width !=0 && this.height!=0){ super.paintComponent(g); icon_Label.paintIcon(this, g, this.width, this.height); } else{ g.drawImage(icon_Label.getImage(),0,0, null); super.paintComponent(g); } } @Override public void mouseClicked(MouseEvent arg0) { // TODO Auto-generated method stub } @Override public void mouseEntered(MouseEvent me) { // TODO Auto-generated method stub if(hover_icon!=null){ this.icon_Label=hover_icon; this.repaint(); this.revalidate(); } else{ this.icon_Label=normal_icon; this.repaint(); this.revalidate(); } } @Override public void mouseExited(MouseEvent arg0) { // TODO Auto-generated method stub if(normal_icon!=null){ this.icon_Label=normal_icon; this.repaint(); this.revalidate(); } else{ this.icon_Label=hover_icon; this.repaint(); this.revalidate(); } } @Override public void mousePressed(MouseEvent arg0) { // TODO Auto-generated method stub } @Override public void mouseReleased(MouseEvent arg0) { // TODO Auto-generated method stub } } 

// Here Using Custom JLabel

JLabel customLabel;

customLabel = new CustomLabel (imageicon1, imageicon2, text, 0,0)

//Here

Imageiocn1 = Start icon for JLabel.

Imageicon2 = Onhover for JLabel.

Text = Some String to set the name for JLabel.