如何在 jbutton 上设置悬停效果？

Question

我正在尝试创建一个使用两个按钮的 Java 桌面应用程序。我想在这些按钮中添加悬停效果。我想要：当我点击任何按钮时，它应该改变它的背景颜色。

我怎样才能实现它？

这是我的代码：

 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");

        }
    });
  }
}

原文由 user3456343 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

您可以使用鼠标 Entered 和 Exited JButton ，做任何你想做的事。

例如：

 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"));
    }
});

原文由 Salah 发布，翻译遵循 CC BY-SA 3.0 许可协议

Answer 2

我曾经写过一个自定义的 JButton，当鼠标通过动画悬停在它上面时，它用来改变它的透明度级别。这是该按钮的代码：

 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();
    }
  }
}

这是 HoverButton 的快速演示：

 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();
      }
    });
  }
}

好消息是，您还可以调整代码以更改按钮的背景颜色，并且以动画方式更改。

原文由 Aman Agnihotri 发布，翻译遵循 CC BY-SA 3.0 许可协议