Components don't show in custom JPanel/JComponent
- by Bart van Heukelom
I've created a custom swing component. I can see it (the grid from the paint method is drawn), but the buttons that are added (verified by println) aren't shown. What am I doing wrong?
Background information: I'm trying to build a tree of visible objects like the Flash/AS3 display list.
public class MapPanel extends JComponent { // or extends JPanel, same effect
private static final long serialVersionUID = 4844990579260312742L;
public MapPanel(ShapeMap map) {
setBackground(Color.LIGHT_GRAY);
setPreferredSize(new Dimension(1000,1000));
setLayout(null);
for (Layer l : map.getLayers()) {
// LayerView layerView = new LayerView(l);
// add(layerView);
System.out.println(l);
JButton test = new JButton(l.getName());
add(test);
validate();
}
}
@Override
protected void paintComponent(Graphics g) {
// necessary?
super.paintComponent(g);
// background
g.setColor(getBackground());
g.fillRect(0, 0, getWidth(), getHeight());
// grid
g.setColor(Color.GRAY);
for (double x = 0; x < getWidth(); x += 10) {
g.drawLine((int)x, 0, (int)x, getHeight());
}
for (double y = 0; y < getHeight(); y += 10) {
g.drawLine(0, (int)y, getWidth(), (int)y);
}
}
}
