Java Reference
In-Depth Information
To track the date that the user selected in the
addValueChangeHandler
method above,
you'll need to add another private instance variable called startDate.
private Date startDate;
Your preceding
addValueChangeHandler
method also calls a
renameColumns
method.
To implement this method and its helper methods we need to have a quick
discussion regarding date classes. Unfortunately, GWT doesn't support
java.util.Calendar
on the client and it doesn't appear that it will any time soon. Due
to the way that individual browsers deal with dates, using dates on the client side
with GWT is currently messy and involves using all of the deprecated methods of the
java.util.Date
class. Here is your
renameColumns
method along with the helper
methods using the deprecated
java.util.Date
class methods.
private void renameColumns() {
flexEntryTable.setText(0, 3, formatDate(startDate));
flexEntryTable.setText(0, 4, formatDate(addDays(startDate,1)));
flexEntryTable.setText(0, 5, formatDate(addDays(startDate,2)));
flexEntryTable.setText(0, 6, formatDate(addDays(startDate,3)));
flexEntryTable.setText(0, 7, formatDate(addDays(startDate,4)));
flexEntryTable.setText(0, 8, formatDate(addDays(startDate,5)));
flexEntryTable.setText(0, 9, formatDate(addDays(startDate,6)));
}
private Date addDays(Date d, int numberOfDays) {
int day = d.getDate();
int month = d.getMonth();
int year = d.getYear();
return new Date(year, month, day+numberOfDays);
}
private String formatDate(Date d) {
return (d.getMonth()+1)+"/"+d.getDate()+"
("+d.toString().substring(0, 2)+")";
}
The last part of this chapter covers the
FlexTable
and how users enter their time.
Each row has a
text box
for each day of the week, and you'll need to implement
handlers and listeners to validate the data that the user enters. Add the following
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