Table of Contents
In part five we are transforming the user list that we built in part four into a filter for the issues list. When a user is selected, only issues for that user shall be displayed.
Just as Glazed Lists provides models for lists, combo boxes and tables, it
provides a model for list selection. The EventSelectionModel
provides two advantages over the standard
DefaultListSelectionModel.
It provides its own EventList which contains the widget's
current selection. You can now access the selected elements like they are the
elements of an ArrayList or
Vector.
It provides a fourth selection mode in addition to the standard modes of single,
single range and multiple range selection. With
MULTIPLE_INTERVAL_SELECTION, when a row is inserted within
a selected range, the inserted row becomes selected. This can be annoying when
unfiltering because restored elements may become selected. This problem is solved
by EventSelectionModel's default
MULTIPLE_INTERVAL_SELECTION_DEFENSIVE mode, which does not
add inserted elements to the selection.
When implementing filtering we display an issue only if there are no users selected
or if that issue's user is among those selected. This is easy by using the
isEmpty() and contains() methods of the
selection list.
if(usersSelectedList.isEmpty()) return true;
...
String user = issue.getAssignedTo();
return usersSelectedList.contains(user);