I have created a simple frame with a panel, that has a grid layout manager. When I create two custom buttons with overwritten paintComponent(g: Graphics) method then the background of one button is painted wrong.
I guess this is due to the fact that the position is always x=0, y=0. How can I fix that?
Button code:
public class JRoundedButton extends JButton {
private int arcRadius;
public JRoundedButton(String label, int arcRadius) {
super(label);
this.setContentAreaFilled(false);
this.arcRadius = arcRadius;
}
@Override
protected void paintComponent(Graphics g) {
if (g instanceof Graphics2D) {
//super.paintComponent(g);
Graphics2D graphics = (Graphics2D) g;
graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
//Draw button background
graphics.setColor(getBackground());
graphics.fillRoundRect(getX(), getY(), getWidth() - 1, getHeight() - 1, arcRadius, arcRadius);
//Draw font
this.paintText(graphics);
}
}
protected final void paintText(@NotNull Graphics2D g) {
//Draw font
g.setColor(getForeground());
if (this.getFont() != null && this.getText() != null) {
FontMetrics fm = getFontMetrics(getFont());
g.setColor(this.getForeground());
g.drawString(this.getText(), ((this.getWidth() / 2) - (fm.stringWidth(this.getText()) / 2)),
((this.getHeight() / 2) + fm.getMaxDescent()));
}
}
And here is the frame creation code:
public static void main(String[] args) {
JFrame frame = new JFrame("Buttontest");
frame.setSize(new Dimension(500, 500));
frame.setLayout(new BorderLayout());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel contentPanel = new JPanel();
contentPanel.setSize(new Dimension(500, 500));
contentPanel.setLayout(new GridLayout(2, 1, 0, 20));
JRoundedButton button1 = new JRoundedButton("Rounded Button", 40);
button1.setForeground(Color.YELLOW);
button1.setBackground(Color.GREEN);
JRoundedButton button2 = new JRoundedButton("Rounded Button 2", 40);
button2.setForeground(Color.WHITE);
button2.setBackground(Color.BLACK);
contentPanel.add(button1);
contentPanel.add(button2);
frame.add(contentPanel, BorderLayout.CENTER);
frame.setVisible(true);
}
If I execute the button, the upper one appears as expected, but the lower one does not show the black background. Why is that?
On quick glance, I note that this is wrong:
graphics.fillRoundRect(getX(), getY(), getWidth() - 1, getHeight() - 1, arcRadius, arcRadius);
Understand that both getX() and getY() return the component's position relative to its parent component, usually a JPanel that your button sits in, but this is not where you should be drawing. Rather the drawing should be in a location relative to the button itself.
So this will probably work better:
graphics.fillRoundRect(0, 0, getWidth() - 1, getHeight() - 1, arcRadius, arcRadius);