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所以我在背景图像顶部有几个 JButton,它们被设置为透明的,因此可以看到背景。但是,当我单击按钮时,在单击鼠标按钮时按钮所在的位置会出现一个灰色方块。这看起来有点难看,我想知道是否有任何方法可以禁用该动画?谢谢

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1 回答 1

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胡乱猜测...,您可以尝试一种JPanel#setOpaque(false)方法:

在此处输入图像描述

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class PanelOpaqueTest {
  public JComponent makeUI() {
    JPanel p1 = createPanel();
    p1.setBorder(BorderFactory.createTitledBorder("JPanel#setOpaque(false)"));
    p1.setOpaque(false);
    p1.add(createButton());

    JPanel p2 = createPanel();
    p2.setBorder(BorderFactory.createTitledBorder("JPanel#setOpaque(true)"));
    p2.setOpaque(true);
    p2.add(createButton());

    JPanel p = new JPanel(new GridLayout(2,1));
    p.add(p1);
    p.add(p2);
    return p;
  }
  protected JButton createButton() {
    JButton b = new JButton("button");
    b.setContentAreaFilled(false);
    b.setFocusPainted(false);
    //b.setBorderPainted(false);
    //b.setOpaque(false);
    return b;
  }
  protected JPanel createPanel() {
    return new JPanel() {
      @Override public void paintComponent(Graphics g) {
        g.setColor(new Color(100,100,100,100));
        g.fillRect(0,0,getWidth(),getHeight());
      }
    };
  }
  public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
      @Override public void run() {
        createAndShowGUI();
      }
    });
  }
  public static void createAndShowGUI() {
    JFrame f = new JFrame();
    f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    f.getContentPane().add(new PanelOpaqueTest().makeUI());
    f.setSize(320, 240);
    f.setLocationRelativeTo(null);
    f.setVisible(true);
  }
}
于 2013-06-03T06:41:37.483 回答