Press enter to continue (Jpanel)

[david522]

Have googled this extensively. I first discovered that "press any key to continue" wasn't possible but now I am confused as to what i've found on google. Can't seem to find any threads which refer to this on a gui interface...

What I need is for the title screen to clear when enter is pressed. Any help appreciated!

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class A3JPanel extends JPanel implements KeyListener {
	private boolean showTitleScreen;

 	public A3JPanel() {
		setBackground(Color.white);
		showTitleScreen = true;
		addKeyListener(this);
	}
	public void keyPressed(KeyEvent e) {
		if(e.getKeyChar() == e.VK_ENTER)  {
			showTitleScreen = false;
		}	
	}
	public void actionPerformed(ActionEvent e) {
	}
   	public void paintComponent(Graphics g){
 	    super.paintComponent(g);
		if (showTitleScreen == true) {
			g.setFont(new Font ("sansserif", Font.BOLD, 25));
			g.drawString("Welcome to Crashing Balls", 100, 50);
			g.setFont(new Font ("serif", Font.PLAIN, 15));
			g.drawString("The objective of this game is to control your own ball while avoiding the ", 50, 150);
			g.drawString("bouncing balls for as long as you can. After you collide with a ball twice,", 50, 165);
			g.setColor(Color.RED);
			g.setFont(new Font ("serif", Font.BOLD, 15));
			g.drawString("it's game over.", 200, 180);
			g.fillOval(185, 220, 35, 35);
			g.fillOval(280, 220, 35, 35);
			g.fillOval(185, 340, 35, 35);
			g.fillOval(280, 340, 35, 35);
			g.setColor(Color.BLUE);
			g.fillOval(230, 280, 35, 35);
			g.setColor(Color.BLACK);
			g.drawString("Press any key to begin",50, 410);
			
		}
		else {
			g.fillOval(230, 280, 35, 35);
		}	
			
		

	}
	public void keyReleased(KeyEvent e) {}
	public void keyTyped(KeyEvent e) {}

}

[mine0926]

You want to clear your panel when ENTER KEY is pressed but your code do different.

	public void keyPressed(KeyEvent e) {
		if (e.getKeyChar() == 's') {
			showTitleScreen = false;
		}
	}

and your keyPressed method is waiting for 's'.

Also, Is this running? I do not see main?

[david522]

Yeh sorry I was just testing to try and get something to work.. This is just the JPanel component. Have a JFrame and app as well.

[mine0926]

Your panel should be focusable and the focus should be on panel so you need to add

 setFocusable(true);
 requestFocus();

Also, you have to call the paintComponent() on keyPressed()

Is this a homework? Are you required to use KeyListener? It is much easier and correct to use KeyBinding.

[david522]

Nope not homework, basically a project where I have to make a game. We haven't actually learnt how to use KeyBindings yet though so would be a bit lost if i used them.

[mine0926]

OK. Is your problem solved? Kindly mark this thread solve through thread tools located at top of this thread.

[david522]

Nope, I don't really understand how to implement the methods you've described... Having trouble just calling the method.. Sorry I'm very new to this...

public void keyPressed(KeyEvent e) {
		if(e.getKeyChar() == e.VK_ENTER)  {
			showTitleScreen = false;
		}	
	}

have got this now under the keypressed method but everyway I've tried to call the paintComponent method results in an error.

[mine0926]

The component that will receive the keyPressed() is JPanel. By default (and you have not set it), JPanels are NOT focusable,
and that is the problem because KeyListeners run ONLY when the component is IN FOCUS. To solve this issue you have to set JPanels focusable to true
and then set window's focus to the JPanel.

 	public A3JPanel()
        {
            setBackground(Color.white);
            showTitleScreen = true;
            addKeyListener(this);
            [b]setFocusable(true);
            requestFocus();[/b]
	}

This does not end here. You have to call again the paintComponent() or update() method to clear JPanel under keyPressed method.

Post your code on how you call paintComponent() under keyPressed().

[DarrylBurke]

Don't even try to call paintComponent(...). The correct way to update a component is to call repaint().

Also, from the API for requestFocus():

Because the focus behavior of this method is platform-dependent, developers are strongly encouraged to use requestFocusInWindow when possible.

db

[david522]

Cheers have solved :) Just added repaint(); Thanks guys!

[shashank.ganta]

public void keyPressed(KeyEvent keyEvent){
if(keyEvent.getKeyCode() == KeyEvent.VK_ENTER){
repaint();
}
}


this also works check it once...