Owner Draw JComponent Problem
Hi,
This is the test code.
public class comp extends JComponent {
@Override
public void paintComponent(Graphics g) {
g.drawRect(10, 10, 100, 100);
}
}
public class test {
public static void main(String[] args) {
// TODO Auto-generated method stub
JFrame fr = new JFrame("test");
fr.setVisible(true);
fr.setSize(200, 200);
JPanel pan = new JPanel();
comp c = new comp();
pan.add(c);
//fr.getContentPane().add(c);// it works
fr.getContentPane().add(pan);// doesn't work
c.repaint();
fr.validate();
}
}
I don't understand why java doesn't draw the rect if I put it in a JPanel. Could you give me a hint how to do this ?
I think that it draws, but the component may be too small to see. It might work if you make your component bigger. Try setting prefered size to something bigger than the rectangle.
Something like
fr.setSize(200, 200);
JPanel pan = new JPanel();
comp c = new comp();
c.setPreferredSize(new Dimension(150, 150));
Message was edited by:
petes1234
thanks petes for your good answer and it works with the previous code, but
my mistake was that I simplified the code too much to replicate the problem... I wanna make it like this:
public class pane extends JPanel {
public void putComponent() {
comp c = new comp();
add(c);
c.setPreferredSize(new Dimension(120, 120));
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
JFrame fr = new JFrame("test");
fr.setVisible(true);
fr.setSize(200, 200);
pane pan = new pane();
fr.getContentPane().add(pan);
pan.putComponent();
}
Like this is still doesn't work. If you have another idea please drop a line.
Thank you
sorry, I forgot to put a repaint() call in putComponent() proc.I'll come back with another code, because I set the preferred size in my original program and it still doesn't work.also, sorry for not putting code in it's special tag. This is the first time I use this
no need for "repaint" here I think. Try something like this:
import java.awt.*;
import javax.swing.*;
class Test extends JFrame
{
public Test()
{
super("test");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setPreferredSize(new Dimension(300, 300));
Pane myPane = new Pane();
myPane.putComponent();
getContentPane().add(myPane);
}
class Pane extends JPanel
{
public void putComponent()
{
Comp c = new Comp();
add(c);
c.setPreferredSize(new Dimension(120,120));
}
}
class Comp extends JComponent
{
@Override
public void paintComponent(Graphics g)
{
super.paintComponent(g);
g.drawRect(10, 10, 100, 100);
}
}
private static void createGUI()
{
Test t = new Test();
t.pack();
t.setVisible(true);
}
public static void main(String[] args)
{
javax.swing.SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
createGUI();
}
});
}
}
Message was edited by:
petes1234
