I'm having problems adding a JPanel, which has a paintComponent in it, to a JFrame.
If this is the only thing I add to the frame, it works. But as soon as I add a layout manager and add other components to the JFrame, it no longer shows the panel with the painting!
To make this clearer ...
This is the code that works and the JPanel is successfully shown:
The panel that draws the sign (in reality i am not trying to paint hello, this is to simply the code here)
public class SignPanel2 extends JPanel {
public int hello;
public void paintComponent(Graphics comp) {
Graphics g = (Graphics) comp;
g.setColor(Color.LIGHT_GRAY);
g.fillRect(70, 250, 150, 150);
g.setColor(Color.BLACK);
if (hello > 0)
g.drawString("h",135, 270);
if (hello > 1 )
g.drawString("h e",135, 270);
if (hello > 2)
g.drawString("h e l",135, 270);
if (hello > 3)
g.drawString("h e l l",135, 270);
if (hello > 4)
g.drawString("h e l l o",135, 270);
}
}The frame i put the panel on:
public class SignFrame extends JFrame {
// the constructor method
public SignFrame () {
super("This is the title of the Sign Frame");
setSize(300,500);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// make a container for the frame
Container content = getContentPane();
// call from the drawing panel
SignPanel2 signpanel = new SignPanel2();
// change class variable of SignPanel
signpanel.hello = 5;
signpanel.repaint();
// add signpanel to container
content.add(signpanel);
setContentPane(content);
setVisible(true);
}
}The main class
public class TheSignMain {
public static void main (String[] args) {
SignFrame signframe = new SignFrame();
}
}The above works perfectly fine and gives me a frame with the desired drawing in it.
But if I add other components to the frame and add a layout manager, it no longer shows me the painting. even if I use repaint().
I have to include a layout manager, otherwise it adds the panel with the painting, but not the other components. This is how my frame class looks now, and this is where i'm having problems.
public class SignFrame extends JFrame {
// the constructor method
public SignFrame () {
super("This is the title of the Sign Frame");
setSize(300,500);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// make a container for the frame
Container content = getContentPane();
// need a layout manager to decide the arrangement of the components on the container
FlowLayout flo = new FlowLayout();
// designate the layout manager to the container
content.setLayout(flo);
// make components
JPanel buttons = new JPanel();
JButton play = new JButton("Play");
JButton pause = new JButton("Pause");
JButton stop = new JButton("Stop");
// add components to a panel
buttons.add(play);
buttons.add(pause);
buttons.add(stop);
// add panel to frame container
content.add(buttons);
// call from the drawing panel
SignPanel2 signpanel = new SignPanel2();
// change class variable of SignPanel
signpanel.hello = 5;
signpanel.repaint();
// add signpanel to container
content.add(signpanel);
setContentPane(content);
setVisible(true);
}
}I am totally new to Java, so any help will be much appreciated. Sorry for all that code and thanks for your help!!
