0

我想制作一个透明的按钮，直到用户用鼠标悬停在它上面，所以我创建了自己的扩展 JButton 的类。我对其进行了测试，它确实使按钮透明并且确实检测到用户何时将鼠标悬停在它上面，但之后它并没有使它变得不透明。我需要用这个代码改变什么？

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

public class TransparentButton extends JButton {

    boolean opaque = false, areaFilled = false, borderPainted = false;

    public TransparentButton(Icon icon) {
        super(icon);
        initialise();
    }

    public TransparentButton(String text) {
        super(text);
        initialise();
    }

    private void initialise() {
        super.setOpaque(opaque);
        super.setContentAreaFilled(areaFilled);
        super.setBorderPainted(borderPainted);
        super.addMouseListener(new MouseListener() {
            public void mouseEntered(MouseEvent e) {
                opaque = true;
                areaFilled = true;
                borderPainted = true;
            }

            public void mouseExited(MouseEvent e) {
                opaque = false;
                areaFilled = false;
                borderPainted = false;
            }

            public void mouseClicked(MouseEvent e) {}
            public void mousePressed(MouseEvent e) {}
            public void mouseReleased(MouseEvent e) {}
        });
    }
}
4

4 回答 4

1 
import javax.swing.*;
import java.awt.event.*;

public class TransparentButton extends JButton {

    boolean opaque = false, areaFilled = false, borderPainted = false;

    public TransparentButton(Icon icon) {
        super(icon);
        initialise();
    }

    public TransparentButton(String text) {
        super(text);
        initialise();
    }

    private void initialise() {

        super.addMouseListener(new MouseListener() {
            public void mouseEntered(MouseEvent e) {
                opaque = true;
                areaFilled = true;
                borderPainted = true;
                reset();

            }

            public void mouseExited(MouseEvent e) {
                opaque = false;
                areaFilled = false;
                borderPainted = false;
                reset();
            }

            public void mouseClicked(MouseEvent e) {}
            public void mousePressed(MouseEvent e) {}
            public void mouseReleased(MouseEvent e) {}
        });
    }

    private void reset() {
        super.setOpaque(opaque);
        super.setContentAreaFilled(areaFilled);
        super.setBorderPainted(borderPainted);
    }
}
于 2012-04-06T07:52:50.210 回答
1

boolean opaque = false，areaFilled = false，borderPainted = false；字段 opaque、areaFilled 和borderPainted 是您的类的局部变量。改变它不会影响晚餐课！

setOpaque、setContentAreaFilled 和 setBorderPainted 方法背后有很多逻辑，你应该使用它

于 2012-04-06T08:01:43.810 回答
1
于 2012-04-06T08:10:51.933 回答
0

设置变量是不够的。您还必须在按钮上调用适当的方法：

        public void mouseEntered(MouseEvent e) {
                super.setOpaque(true);
                super.setContentAreaFilled(true);
                super.setBorderPainted(true);

        }

        public void mouseExited(MouseEvent e) {
                super.setOpaque(false);
                super.setContentAreaFilled(false);
                super.setBorderPainted(false);

        }

PS：我没有测试。但这在逻辑上似乎很明显

于 2012-04-06T07:47:53.233 回答