Verify input (format for date)
/*
* Text example snippet: verify input (format for date)
*
* For a list of all SWT example snippets see
* http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
*/
import java.util.Calendar;
import org.eclipse.swt.SWT;
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 Snippet179 {
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);
text.setText("YYYY/MM/DD");
;
final Calendar calendar = Calendar.getInstance();
text.addListener(SWT.Verify, new Listener() {
boolean ignore;
public void handleEvent(Event e) {
if (ignore)
return;
e.doit = false;
StringBuffer buffer = new StringBuffer(e.text);
char[] chars = new char[buffer.length()];
buffer.getChars(0, chars.length, chars, 0);
if (e.character == '\b') {
for (int i = e.start; i < e.end; i++) {
switch (i) {
case 0: /* [Y]YYY */
case 1: /* Y[Y]YY */
case 2: /* YY[Y]Y */
case 3: /* YYY[Y] */{
buffer.append('Y');
break;
}
case 5: /* [M]M */
case 6: /* M[M] */{
buffer.append('M');
break;
}
case 8: /* [D]D */
case 9: /* D[D] */{
buffer.append('D');
break;
}
case 4: /* YYYY[/]MM */
case 7: /* MM[/]DD */{
buffer.append('/');
break;
}
default:
return;
}
}
text.setSelection(e.start, e.start + buffer.length());
ignore = true;
text.insert(buffer.toString());
ignore = false;
text.setSelection(e.start, e.start);
return;
}
int start = e.start;
if (start > 9)
return;
int index = 0;
for (int i = 0; i < chars.length; i++) {
if (start + index == 4 || start + index == 7) {
if (chars[i] == '/') {
index++;
continue;
}
buffer.insert(index++, '/');
}
if (chars[i] < '0' || '9' < chars[i])
return;
if (start + index == 5 && '1' < chars[i])
return; /* [M]M */
if (start + index == 8 && '3' < chars[i])
return; /* [D]D */
index++;
}
String newText = buffer.toString();
int length = newText.length();
StringBuffer date = new StringBuffer(text.getText());
date.replace(e.start, e.start + length, newText);
calendar.set(Calendar.YEAR, 1901);
calendar.set(Calendar.MONTH, Calendar.JANUARY);
calendar.set(Calendar.DATE, 1);
String yyyy = date.substring(0, 4);
if (yyyy.indexOf('Y') == -1) {
int year = Integer.parseInt(yyyy);
calendar.set(Calendar.YEAR, year);
}
String mm = date.substring(5, 7);
if (mm.indexOf('M') == -1) {
int month = Integer.parseInt(mm) - 1;
int maxMonth = calendar.getActualMaximum(Calendar.MONTH);
if (0 > month || month > maxMonth)
return;
calendar.set(Calendar.MONTH, month);
}
String dd = date.substring(8, 10);
if (dd.indexOf('D') == -1) {
int day = Integer.parseInt(dd);
int maxDay = calendar.getActualMaximum(Calendar.DATE);
if (1 > day || day > maxDay)
return;
calendar.set(Calendar.DATE, day);
} else {
if (calendar.get(Calendar.MONTH) == Calendar.FEBRUARY) {
char firstChar = date.charAt(8);
if (firstChar != 'D' && '2' < firstChar)
return;
}
}
text.setSelection(e.start, e.start + length);
ignore = true;
text.insert(newText);
ignore = false;
}
});
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}
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