我在互联网上搜索是否有在 Java Swing 中制作钢琴的正确方法。但要么他们在黑键之间有间隙，要么他们没有解释他们是如何做到的。
我尝试使用具有空布局的 JPanel，并首先使用 MouseListener 添加白键（Jpanels 或 Jbuttons），然后添加黑键，使它们应该位于白键之上。问题是它不是非常优雅的代码，除此之外，它不起作用。
有谁知道如何用Java制作钢琴？
这是我的代码：
package me.Trainer.Piano;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JPanel;
import me.Trainer.Enums.Note;
public class PianoGraphics {
static volatile Note result = null;
public static JPanel getDrawnKeyboard() {
JPanel panel = new JPanel() {
private static final long serialVersionUID = 502433120279478947L;
Dimension lastFrame;
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
int width = this.getWidth();
int height = this.getHeight();
if (lastFrame != this.getSize()) {
this.removeAll();
JPanel white = new JPanel() {
private static final long serialVersionUID = 2350489085544800839L;
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.LIGHT_GRAY);
g.drawRect(0, 0, this.getWidth(), this.getHeight());
};
};
white.setBackground(Color.WHITE);
white.setSize(width / 52, height);
for (int i = 0; i < 52; i++) {
Note note;
int oct = (int) i / 7;
switch(i % 7) {
case 0:
note = Note.values()[0 + (oct * 12)];
break;
case 1:
note = Note.values()[2 + (oct * 12)];
break;
case 2:
note = Note.values()[3 + (oct * 12)];
break;
case 3:
note = Note.values()[5 + (oct * 12)];
break;
case 4:
note = Note.values()[7 + (oct * 12)];
break;
case 5:
note = Note.values()[8 + (oct * 12)];
break;
case 6:
note = Note.values()[10 + (oct * 12)];
break;
default:
note = Note.C4;
}
white.setLocation(i * (width / 52), 0);
white.addMouseListener(new KeyboardMouseListener() {
Note n = note;
@Override
public void mouseReleased(MouseEvent e) {
white.setBackground(Color.WHITE);
result = null;
}
@Override
public void mouseClicked(MouseEvent e) {
white.setBackground(Color.LIGHT_GRAY);
result = n;
}
});
this.add(white);
}
JPanel black = new JPanel() {
private static final long serialVersionUID = 8445848892107864631L;
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.DARK_GRAY);
g.drawRect(0, 0, this.getWidth(), this.getHeight());
};
};
black.setBackground(Color.BLACK);
black.setSize(width / 108, height / 3 * 2);
for (int i = 0; i < 7; i++) {
Note note = Note.values()[1 + (i*12)];
JPanel b = black;
b.setLocation(i*12*8 + 7, 0);
b.addMouseListener(new KeyboardMouseListener() {
public void mouseClicked(MouseEvent e) {
b.setBackground(Color.DARK_GRAY);
result = note;
};
public void mouseReleased(MouseEvent e) {
b.setBackground(Color.BLACK);
result = null;
System.out.println(note.name());
};
});
this.add(b);
JPanel b1 = black;
Note note1 = Note.values()[1 + (i*12)];
b1.setLocation(i*12*8 + 21, 0);
b1.addMouseListener(new KeyboardMouseListener() {
public void mouseClicked(MouseEvent e) {
b1.setBackground(Color.DARK_GRAY);
result = note1;
System.out.println(note1.name());
};
public void mouseReleased(MouseEvent e) {
b1.setBackground(Color.BLACK);
result = null;
};
});
this.add(b1);
JPanel b2 = black;
Note note2 = Note.values()[1 + (i*12)];
b2.setLocation(i*12*8 + 30, 0);
b2.addMouseListener(new KeyboardMouseListener() {
public void mouseClicked(MouseEvent e) {
b2.setBackground(Color.DARK_GRAY);
result = note2;
};
public void mouseReleased(MouseEvent e) {
b2.setBackground(Color.BLACK);
result = null;
};
});
this.add(b2);
JPanel b3 = black;
Note note3 = Note.values()[1 + (i*12)];
b3.setLocation(i*12*8 + 45, 0);
b3.addMouseListener(new KeyboardMouseListener() {
public void mouseClicked(MouseEvent e) {
b3.setBackground(Color.DARK_GRAY);
result = note3;
};
public void mouseReleased(MouseEvent e) {
b3.setBackground(Color.BLACK);
result = null;
};
});
this.add(b3);
JPanel b4 = black;
Note note4 = Note.values()[1 + (i*12)];
b4.setLocation(i*12*8 + 53, 0);
b4.addMouseListener(new KeyboardMouseListener() {
public void mouseClicked(MouseEvent e) {
b4.setBackground(Color.DARK_GRAY);
result = note4;
};
public void mouseReleased(MouseEvent e) {
b4.setBackground(Color.BLACK);
result = null;
};
});
this.add(b4);
}
}
lastFrame = this.getSize();
}
};
panel.setLayout(null);
return panel;
}
public static Note waitForNote() {
while (result == null) {}
Note note = result;
result = null;
return note;
}
}
class KeyboardMouseListener implements MouseListener {
@Override
public void mouseClicked(MouseEvent e) {}
@Override
public void mouseEntered(MouseEvent e) {}
@Override
public void mouseExited(MouseEvent e) {}
@Override
public void mousePressed(MouseEvent e) {}
@Override
public void mouseReleased(MouseEvent e) {}
}
这就是我得到的： 没有什么是可点击的
