Mega Code Archive
Use a regular expression to verify input(a phone number is used)
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/*******************************************************************************
* Copyright (c) 2000, 2005 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
//package org.eclipse.swt.snippets;
/*
* Text example snippet: use a regular expression to verify input
* In this case a phone number is used.
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*/
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class TextVerifyInputRegularExpression {
/*
* Phone numbers follow the rule
* [(][1-9][1-9][1-9][)][1-9][1-9][1-9][-][1-9][1-9][1-9][1-9]
*/
private static final String REGEX = "[(]\\d{3}[)]\\d{3}[-]\\d{4}"; //$NON-NLS-1$
private static final String template = "(###)###-####"; //$NON-NLS-1$
private static final String defaultText = "(000)000-0000"; //$NON-NLS-1$
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new GridLayout());
final Text text = new Text(shell, SWT.BORDER);
Font font = new Font(display, "Courier New", 10, SWT.NONE); //$NON-NLS-1$
text.setFont(font);
text.setText(template);
text.addListener(SWT.Verify, new Listener() {
// create the pattern for verification
Pattern pattern = Pattern.compile(REGEX);
// ignore event when caused by inserting text inside event handler
boolean ignore;
public void handleEvent(Event e) {
if (ignore)
return;
e.doit = false;
if (e.start > 13 || e.end > 14)
return;
StringBuffer buffer = new StringBuffer(e.text);
// handle backspace
if (e.character == '\b') {
for (int i = e.start; i < e.end; i++) {
// skip over separators
switch (i) {
case 0:
if (e.start + 1 == e.end) {
return;
} else {
buffer.append('(');
}
break;
case 4:
if (e.start + 1 == e.end) {
buffer.append(new char[] { '#', ')' });
e.start--;
} else {
buffer.append(')');
}
break;
case 8:
if (e.start + 1 == e.end) {
buffer.append(new char[] { '#', '-' });
e.start--;
} else {
buffer.append('-');
}
break;
default:
buffer.append('#');
}
}
text.setSelection(e.start, e.start + buffer.length());
ignore = true;
text.insert(buffer.toString());
ignore = false;
// move cursor backwards over separators
if (e.start == 5 || e.start == 9)
e.start--;
text.setSelection(e.start, e.start);
return;
}
StringBuffer newText = new StringBuffer(defaultText);
char[] chars = e.text.toCharArray();
int index = e.start - 1;
for (int i = 0; i < e.text.length(); i++) {
index++;
switch (index) {
case 0:
if (chars[i] == '(')
continue;
index++;
break;
case 4:
if (chars[i] == ')')
continue;
index++;
break;
case 8:
if (chars[i] == '-')
continue;
index++;
break;
}
if (index >= newText.length())
return;
newText.setCharAt(index, chars[i]);
}
// if text is selected, do not paste beyond range of selection
if (e.start < e.end && index + 1 != e.end)
return;
Matcher matcher = pattern.matcher(newText);
if (matcher.lookingAt()) {
text.setSelection(e.start, index + 1);
ignore = true;
text.insert(newText.substring(e.start, index + 1));
ignore = false;
}
}
});
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
font.dispose();
display.dispose();
}
}
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