/**
 * GridBagLayoutApplet.java
 * Copyright (c) 1998 Yoon Kyung Koo. All rights reserved.
 *
 * First release date 1998/06/10
 *
 * @version 1.0 1998/06/10
 * @author <A HREF="mailto:yoonforh@yahoo.com">Yoon Kyung Koo</A>
 */

import java.awt.*;

public class GridBagLayoutApplet extends java.applet.Applet {
	GridBagLayout gridbag = new GridBagLayout();
	GridBagConstraints gridc = new GridBagConstraints();
	Button[] button=new Button[10];
	TextField xText, yText, widthText, heightText;
	Choice choice;
	Panel buttonPanel;

	void arrangeButton(Button button) {
		gridbag.setConstraints(button, gridc);
	}

	public void init() {

		buttonPanel=new Panel();
		buttonPanel.setLayout(gridbag);
		setFont(new Font("Helvetica", Font.PLAIN, 14));
		gridc.fill = GridBagConstraints.BOTH;
		for (int i=0; i<10; i++) {
			button[i]=new Button("Button"+(i+1));
			buttonPanel.add(button[i]);
		}
		arrangeButton(button[0]);
		arrangeButton(button[1]);
		arrangeButton(button[2]);
		gridc.gridwidth = GridBagConstraints.REMAINDER; //end row
		arrangeButton(button[3]);
		arrangeButton(button[4]);
		gridc.gridwidth = GridBagConstraints.RELATIVE; //next-to-last in row
		arrangeButton(button[5]);
		gridc.gridwidth = GridBagConstraints.REMAINDER; //end row
		arrangeButton(button[6]);
		gridc.gridwidth = 1;                   //reset to the default
		gridc.gridheight = 2;
		arrangeButton(button[7]);
		gridc.gridwidth = GridBagConstraints.REMAINDER; //end row
		gridc.gridheight = 1;                  //reset to the default
		arrangeButton(button[8]);
		arrangeButton(button[9]);

		Panel panel=new Panel();
		Panel subPanel1=new Panel();
		Panel subPanel2=new Panel();
		xText=new TextField(3);
		yText=new TextField(3);
		widthText=new TextField(3);
		heightText=new TextField(3);
		choice= new Choice();
		for (int i=0; i<10; i++)
			choice.addItem("Button"+(i+1));
		subPanel1.setLayout(new GridLayout(2, 4));
		subPanel1.add(new Label("weight.x ", Label.RIGHT));
		subPanel1.add(xText);
		subPanel1.add(new Label("weight.y ", Label.RIGHT));
		subPanel1.add(yText);
		subPanel1.add(new Label("width ", Label.RIGHT));
		subPanel1.add(widthText);
		subPanel1.add(new Label("height ", Label.RIGHT));
		subPanel1.add(heightText);
		subPanel2.setLayout(new GridLayout(2, 1));
		subPanel2.add(choice);
		subPanel2.add(new Button("Apply"));

		panel.setLayout(new BorderLayout());
		panel.add("Center", subPanel1);
		panel.add("East", subPanel2);

		setLayout(new BorderLayout());
		add("South", panel);
		add("Center", buttonPanel);
		validate();
	}

	public boolean action(Event evt, Object obj) {
		if (evt.target instanceof Button && ((String) obj).equals("Apply")) {
			String text=xText.getText();
			if (!text.equals("") ) 
				gridc.weightx = Float.valueOf(text).floatValue();
			text=yText.getText();
			if (!text.equals("") ) 
				gridc.weighty = Float.valueOf(text).floatValue();
			text=widthText.getText();
			if (!text.equals("") ) 
				gridc.gridwidth = Integer.valueOf(text).intValue();
			text=heightText.getText();
			if (!text.equals("") ) 
				gridc.gridheight = Integer.valueOf(text).intValue();

			// apply new values
			arrangeButton(button[choice.getSelectedIndex()]);

			// invalidate components and re-layout
			buttonPanel.invalidate();
			buttonPanel.layout();

			// reset to default values
			gridc.weightx = 0.0;
			gridc.weighty = 0.0;
			gridc.gridwidth = 1;
			gridc.gridheight = 1;
			return true;
		}
		else
			return false;
	}
}