Why does the FlowLayoutManager layout more space than needed?

[David M Fairchild]

I have a simple first applet I'm playing with. I defined a Panel to go in the NORTH area of the main Panel and placed a single TextField in the Panel.

For some reason the FlowLayoutManager lays out enough space for 2 rows of TextFields in the Panel? Why is that? Is there a way to make it stop doing that?

[Paul Clapham]

Example of code?

[David M Fairchild]

  
import java.awt.*;
import java.applet.*;

class TheGame extends Canvas {
	
	public TheGame() {
		setBackground(Color.RED);
	}

}


public class Bustup extends Applet {
	public Panel pnlGame = new Panel();
	public TheGame cnvGame = new TheGame();
	public Panel pnlControls = new Panel();
	public Panel pnlStatus = new Panel();
	public Button btnStart = new Button("Start");
	public Button btnPause = new Button("Pause");
	public Button btnReset = new Button("Reset");
	public TextField txtStatus = new TextField("Status:", 40);

	public void init() {
		pnlStatus.setLayout(new FlowLayout(FlowLayout.LEFT));
		pnlStatus.add(txtStatus);

		pnlControls.setLayout(new FlowLayout(FlowLayout.CENTER));
		pnlControls.add(btnStart);
		pnlControls.add(btnPause);
		pnlControls.add(btnReset);

		pnlGame.add(cnvGame);

		setLayout(new BorderLayout());
		add(BorderLayout.NORTH, pnlStatus);
		add(BorderLayout.CENTER, pnlGame);
		add(BorderLayout.SOUTH, pnlControls);

		doLayout();
		repaint();
	}

	public void paint(Graphics g) {
		Rectangle rect = new Rectangle();
		pnlGame.getBounds(rect);
		cnvGame.setBounds(rect);

		pnlStatus.getBounds(rect);
		txtStatus.setText(String.format("Panel bounds = %1$d, %2$d, %3$d, %4$d.",
			rect.x, rect.y, rect.width, rect.height));

	}
	public void update(Graphics g) {

	}

}

[Michael Dunn]

add these 2 lines and you'll see where you need to look

pnlStatus.setBackground(Color.CYAN);
pnlGame.setBackground(Color.BLUE);

[David M Fairchild]

I see where the problem is not in the layout of the status panel. It appears that setBackground() does not set the color of the entire canvas. I would say that my "TheGame" class derived from Canvas is reserving space for a title bar. Although the bounds of cnvGame, an instance of TheGame include the whole canvas. The status text displays "Canvas bounds = 0, 33, 400, 334.". My applet is in a 400 by 400 space on the web page so 400 - 33 - 33 = 334, the full height minus the NORTH and SOUTH panels.

Now I'm looking for why Canvas is allocating space for a title bar and how I can turn that "feature" off.

Thanks for you help. Any additional insights would be helpful.