[英]How to change JLabel's background color through mouse events?
I have aa JPanel
with 9 JLabels
with all of them setBackground()
to the color of white and I have the mouse listener interface implemented in the class. 我有一个带有9个JLabels
JPanel
,所有这些都是setBackground()
到白色的颜色,我在类中实现了鼠标监听器接口。 My purpose is when i left click on my mouse in the region of a JLabel
it will change the color to black or vice versa. 我的目的是当我在JLabel
区域中单击我的鼠标时,它会将颜色更改为黑色,反之亦然。 This is my first time working with mouse events and I'm stuck. 这是我第一次使用鼠标事件而且我被卡住了。 I don't seem to get the whole concept right. 我似乎没有把整个概念说得对。 Can you guys help me out here? 你能帮助我吗? Thanks in advance! 提前致谢! Oh by the way, I do understand that if I were to use a for-loop
the process will be so much easier but I just want to find out whether we can do it the harder way. 哦顺便说一句,我明白如果我要使用for-loop
,那么这个过程会更容易,但我只是想知道我们是否可以用更难的方式去做。 Cheers! 干杯!
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
class TilePanelA extends JPanel implements MouseListener
{
JLabel label1;
JLabel label2;
JLabel label3;
JLabel label4;
JLabel label5;
JLabel label6;
JLabel label7;
JLabel label8;
JLabel label9;
public TilePanelA()
{
this.setLayout(new GridLayout(3, 3));
Dimension labelSize = new Dimension(300, 300);
label1 = new JLabel();
label2 = new JLabel();
label3 = new JLabel();
label4 = new JLabel();
label5 = new JLabel();
label6 = new JLabel();
label7 = new JLabel();
label8 = new JLabel();
label9 = new JLabel();
label1.setPreferredSize(labelSize);
label2.setPreferredSize(labelSize);
label3.setPreferredSize(labelSize);
label4.setPreferredSize(labelSize);
label5.setPreferredSize(labelSize);
label6.setPreferredSize(labelSize);
label7.setPreferredSize(labelSize);
label8.setPreferredSize(labelSize);
label9.setPreferredSize(labelSize);
label1.setBackground(Color.WHITE);
label2.setBackground(Color.WHITE);
label3.setBackground(Color.WHITE);
label4.setBackground(Color.WHITE);
label5.setBackground(Color.WHITE);
label6.setBackground(Color.WHITE);
label7.setBackground(Color.WHITE);
label8.setBackground(Color.WHITE);
label9.setBackground(Color.WHITE);
label1.setOpaque(true);
label2.setOpaque(true);
label3.setOpaque(true);
label4.setOpaque(true);
label5.setOpaque(true);
label6.setOpaque(true);
label7.setOpaque(true);
label8.setOpaque(true);
label9.setOpaque(true);
this.add(label1);
this.add(label2);
this.add(label3);
this.add(label4);
this.add(label5);
this.add(label6);
this.add(label7);
this.add(label8);
this.add(label9);
label1.addMouseListener(this);
label2.addMouseListener(this);
label3.addMouseListener(this);
label4.addMouseListener(this);
label5.addMouseListener(this);
label6.addMouseListener(this);
label7.addMouseListener(this);
label8.addMouseListener(this);
label9.addMouseListener(this);
} // end of constructor
public void mousePressed(MouseEvent e)
{
if (e.getSource() == Color.WHITE)
{
setBackground(Color.BLACK);
} else
{
setBackground(Color.WHITE);
}
}
public void mouseReleased(MouseEvent e)
{
}
public void mouseEntered(MouseEvent e)
{
}
public void mouseExited(MouseEvent e)
{
}
public void mouseClicked(MouseEvent e)
{
}
}
e.getSource()
will return the label that is clicked, not the color of that label (in your example, anyway) e.getSource()
将返回单击的标签,而不是该标签的颜色(在您的示例中,无论如何)
So, cast to a label: 所以,投下一个标签:
JLabel theLabel = (JLabel) e.getSource();
then setBackground on it appropriately: 适当的setBackground:
if (theLabel.getBackground().equals(Color.WHITE)) theLabel.setBackgound(...);
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