How to put Hover effect on jbutton?

问题:

I am trying to create a Java Desktop application where I am using two buttons. I want to add hover effect in those buttons. I want: When I click any button it should change its background color.

How can I achieve it?

Here is my code:

public class Party1Party2 extends JFrame
{
    JButton b1;
    JButton b2;
    Container pane;

    public Party1Party2()
    {
        getContentPane().setBackground(new java.awt.Color(255, 255, 255));

    b2.addActionListener(new ActionListener()
    {
        public void actionPerformed(ActionEvent ae)
        {
            JOptionPane.showMessageDialog(frame, "Welcome to allhabad High Court");
        }
    });

    b1.addActionListener(new ActionListener()
    {
        public void actionPerformed(ActionEvent ae)
        {
            JOptionPane.showMessageDialog(frame, "Welcome to allhabad High Court");

        }
    });
  }
}

回答1:

You can use moused Entered and Exited the JButton, and do what ever you want.

For Example:

jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
    public void mouseEntered(java.awt.event.MouseEvent evt) {
        jButton1.setBackground(Color.GREEN);
    }

    public void mouseExited(java.awt.event.MouseEvent evt) {
        jButton1.setBackground(UIManager.getColor("control"));
    }
});

回答2:

I once wrote a custom JButton which used to change its transparency level when the mouse was hovered over it through animation. Here's the code for that button:

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

public class HoverButton extends JButton
{
  float alpha = 0.5f;

  public HoverButton(String text)
  {
    super(text);
    setFocusPainted(false);
    setBorderPainted(false);
    setContentAreaFilled(false);
    addMouseListener(new ML());
  }

  public float getAlpha()
  {
    return alpha;
  }

  public void setAlpha(float alpha)
  {
    this.alpha = alpha;
    repaint();
  }

  public void paintComponent(java.awt.Graphics g)
  {
    java.awt.Graphics2D g2 = (java.awt.Graphics2D) g;
    g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha));
    super.paintComponent(g2);
  }

  public class ML extends MouseAdapter
  {
    public void mouseExited(MouseEvent me)
    {
      new Thread(new Runnable()
      {
        public void run()
        {
          for (float i = 1f; i >= .5f; i -= .03f)
          {
            setAlpha(i);
            try
            {
              Thread.sleep(10);
            }
            catch (Exception e)
            {
            }
          }
        }
      }).start();
    }

    public void mouseEntered(MouseEvent me)
    {
      new Thread(new Runnable()
      {
        public void run()
        {
          for (float i = .5f; i <= 1f; i += .03f)
          {
            setAlpha(i);
            try
            {
              Thread.sleep(10);
            }
            catch (Exception e)
            {
            }
          }
        }
      }).start();
    }

    public void mousePressed(MouseEvent me)
    {
      new Thread(new Runnable()
      {
        public void run()
        {
          for (float i = 1f; i >= 0.6f; i -= .1f)
          {
            setAlpha(i);
            try
            {
              Thread.sleep(1);
            }
            catch (Exception e)
            {
            }
          }
        }
      }).start();
    }
  }
}

And here's a quick demonstration of the HoverButton:

import javax.swing.*;
import java.awt.*;

public class Demonstration
{
  public Demonstration()
  {
    JFrame frame = new JFrame("Hover Button Demonstration");
    frame.setLayout(new GridBagLayout());
    frame.add(new HoverButton("Hover Button!!"));

    frame.pack();
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
  }

  public static void main(String args[])
  {
    SwingUtilities.invokeLater(new Runnable()
    {
      @Override
      public void run()
      {
        new Demonstration();
      }
    });
  }
}

Good thing is that you can tweak the code to change the background color of the button as well, and that too, in an animated way.

回答3:

Wow. Old question, I know, but...

To change the background, use:

b1.setBackground(new java.awt.Color(r, g, b));

in the actionListener.

For a rollover effect, you can use:

b1.setRolloverEnabled(true);

but you will need to supply icons for your buttons to flip between.

Otherwise, for other hover effects, you do need to use a mouseListener.