[英]mouseover removes transparent background of round JButton in java
一旦我將鼠標懸停在任何圓形按鈕上,它后面就會出現一個方形背景,並且再也不會消失。 當方形背景不可點擊時,該按鈕仍可點擊。 我沒有實現任何 MouseEvents 所以我不知道為什么會出現背景
左:點擊后,中心:鼠標懸停后,右:原始狀態
代碼示例
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class GUI implements ActionListener {
private JLabel textLabel;
private JButton buttonL, buttonConfirm, buttonR;
public GUI() {
JPanel mainDisplay = new JPanel();
mainDisplay.setBackground(new Color(172, 181, 176));
mainDisplay.setPreferredSize(new Dimension(150, 160));
mainDisplay.setLayout(new BorderLayout());
textLabel = new JLabel("1");
textLabel.setHorizontalAlignment(SwingConstants.CENTER);
mainDisplay.add(textLabel, BorderLayout.CENTER);
JPanel container = new JPanel();
container.setLayout(new GridBagLayout());
GridBagConstraints gc = new GridBagConstraints();
gc.gridwidth = GridBagConstraints.REMAINDER;
gc.insets = new Insets(75, 0, 0, 0);
container.add(mainDisplay, gc);
Dimension buttonDimension = new Dimension(18, 18);
Color buttonColor = new Color(242, 240, 241);
buttonL = new RoundButton();
buttonL.setBackground(buttonColor);
buttonL.setPreferredSize(buttonDimension);
buttonL.addActionListener(this);
gc.gridwidth = GridBagConstraints.RELATIVE;
gc.insets = new Insets(10, 20, 0, 0);
container.add(buttonL, gc);
buttonConfirm = new RoundButton();
buttonConfirm.setBackground(buttonColor);
buttonConfirm.setPreferredSize(buttonDimension);
buttonConfirm.addActionListener(this);
gc.insets = new Insets(40, -35, 0, 0);
container.add(buttonConfirm, gc);
buttonR = new RoundButton();
buttonR.setBackground(buttonColor);
buttonR.setPreferredSize(buttonDimension);
buttonR.addActionListener(this);
gc.insets = new Insets(10, -50, 0, 0);
container.add(buttonR, gc);
JFrame frame = new JFrame();
frame.add(container);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == buttonL) {
textLabel.setText("L");;
} else if(e.getSource() == buttonConfirm) {
textLabel.setText("");
} else if(e.getSource() == buttonR) {
textLabel.setText("R");
}
}
public static void main(String[] args) {
new GUI();
}
}
圓形 JButton
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Shape;
import java.awt.geom.Ellipse2D;
import javax.swing.JButton;
public class RoundButton extends JButton {
Shape shape;
@Override
protected void paintComponent(Graphics g) {
g.setColor(getBackground());
g.fillOval(0, 0, getSize().width - 1, getSize().height - 1);
}
@Override
protected void paintBorder(Graphics g) {
g.setColor(Color.darkGray);
g.drawOval(0, 0, getSize().width - 1, getSize().height - 1);
}
@Override
public boolean contains(int x, int y) {
if (shape == null || !shape.getBounds().equals(getBounds())) {
shape = new Ellipse2D.Float(0, 0, getWidth(), getHeight());
}
return shape.contains(x, y);
}
}
進行自定義繪畫時,基本代碼應為:
public void paintComponent(Graphics g)
{
super.paintComponent(g);
// add custom painting here
}
這將確保清除背景,因此沒有繪畫偽影。
但是,在您的情況下,您希望在繪制按鈕之前繪制父面板的背景,因此您需要使用:
button.setOpaque(false);
此外,當您單擊按鈕時,矩形仍會出現,表示按鈕處於按下狀態。 要刪除這幅畫,您需要使用:
button.setContentAreaFilled( false );
查看:為圓形按鈕的另一個實現更改 JButton 焦點區域。
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