Nav99
/**************************************************************************
Nav99: Configurable Navigation Applet
Author: Joe Flatt, joefl@engr.orst.edu
Copyright (C) 1999, Joe Flatt
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
8/19/99 jlf Wrote program.
9/9/99 jlf Added default color selections
9/14/99 jlf Fixed caching difference between browsers
9/16/99 jlf Added font parameters
***************************************************************************/
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.util.StringTokenizer;
import java.net.*;
public class Nav99 extends Applet implements ActionListener, ItemListener {
String[][] urlArray;
String[] target;
Button[] button;
List[] list;
Dimension largeButtonSize;
Component prevList;
Object prevSource;
int rows, smallButtonHeight, listHeightSize;
boolean startSwitch = true;
public void init() {
String bcString, fcString, fontName, fontSize, fontStyle;
Color buttonColor, fontColor;
int token = 0, fontSizeInt, fontStyleInt;
rows = Integer.parseInt(getParameter("rows"));
urlArray = new String[rows][];
target = new String[rows];
button = new Button[rows];
list = new List[rows];
// set Font
fontName = getParameter("fontName");
if (fontName == null)
fontName = "SansSerif";
fontStyle = getParameter("fontStyle");
if (fontStyle == null)
fontStyleInt = 1;
else
fontStyleInt = Integer.parseInt(fontStyle);
fontSize = getParameter("fontSize");
if (fontSize == null)
fontSizeInt = 12;
else
fontSizeInt = Integer.parseInt(fontSize);
// set colors
bcString = getParameter("buttonColor");
if (bcString == null)
buttonColor = new Color (0);
else
buttonColor = new Color (Integer.parseInt(bcString));
fcString = getParameter("fontColor");
if (fcString == null)
fontColor = new Color (16777215);
else
fontColor = new Color (Integer.parseInt(fcString));
this.setLayout(new GridLayout(rows, 1));
for (int i = 0; i < rows; i++) {
// read each row and tokenize
StringTokenizer reader = new StringTokenizer (getParameter("menu" + i),",");
urlArray[i] = new String[reader.countTokens()];
// create row buttons and add them
button[i] = new Button (reader.nextToken());
button[i].setFont(new Font (fontName, fontStyleInt, fontSizeInt));
button[i].setBackground(buttonColor);
button[i].setForeground(fontColor);
this.add(button[i]);
button[i].addActionListener(this);
// read in target frame
target[i] = reader.nextToken();
// populate display list and url array
list[i] = new List();
while (reader.hasMoreTokens()) {
list[i].addItem(reader.nextToken());
urlArray[i][token++] = reader.nextToken();
}
list[i].addItemListener(this);
token = 0;
}
}
// calculate dimensions
public void start() {
if (startSwitch) {
largeButtonSize = button[0].getSize();
smallButtonHeight = (int)(largeButtonSize.height / 1.4);
listHeightSize = (largeButtonSize.height * rows) - (smallButtonHeight * rows);
startSwitch = false;
} else {
this.removeAll();
for (int i = 0; i < rows; i++) {
this.add(button[i]);
}
prevSource = null;
}
}
// detect button actions
public void actionPerformed(ActionEvent evt) {
int currentHeightSize = 0;
boolean oneElementList = false;
Object source = evt.getSource();
// remove previous list
if (prevList != null)
prevList.setVisible(false);
// check for one element list
for (int i = 0; i < rows; i++) {
if (source == button[i] && list[i].getItemCount() == 1) {
// move to large button size
if (!largeButtonSize.equals(button[0].getSize())) {
for (int j = 0; j < rows; j++) {
button[j].setBounds(0, currentHeightSize, largeButtonSize.width, largeButtonSize.height);
currentHeightSize += largeButtonSize.height;
}
}
oneElementList = true;
try {
AppletContext context = getAppletContext();
URL u = new URL(urlArray[i][0]);
context.showDocument(u, target[i]);
}
catch(Exception e) {
showStatus("Error " + e);
}
break;
}
}
if (!oneElementList) {
// if the menu is in a expanded state
if (prevSource == source) {
for (int i = 0; i < rows; i++) {
button[i].setBounds(0, currentHeightSize, largeButtonSize.width, largeButtonSize.height);
currentHeightSize += largeButtonSize.height;
}
prevSource = null;
}
// else move to the expanded state
else {
prevSource = source;
for (int i = 0; i < rows; i++) {
button[i].setBounds(0, currentHeightSize, largeButtonSize.width, smallButtonHeight);
currentHeightSize += smallButtonHeight;
if (source == button[i]) {
prevList = list[i];
this.add(list[i]);
list[i].setBounds(0, currentHeightSize, largeButtonSize.width, listHeightSize);
list[i].setVisible(true);
currentHeightSize += listHeightSize;
}
}
}
}
}
// detect list actions
public void itemStateChanged(ItemEvent evt) {
List source = (List) evt.getSource();
int listIndex = source.getSelectedIndex();
// if item selected go to corresponding url
if (evt.getStateChange() == ItemEvent.SELECTED) {
for (int i = 0; i < rows; i++) {
if (source == list[i]) {
try {
AppletContext context = getAppletContext();
URL u = new URL(urlArray[i][listIndex]);
context.showDocument(u, target[i]);
}
catch(Exception e) {
showStatus("Error " + e);
}
break;
}
}
}
}
}
Back to the Nav99 applet page
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