Java Reference
In-Depth Information
One very useful feature of
ListView
is that scrollbars are automatically added when the
number of items in the list exceeds the number that can be displayed within the control's
dimensions. Because of its ability to make efficient use of limited screen space,
ListView
is a popular alternative to other types of selection controls.
ListView
is a generic class that is declared like this:
class ListView<T>
Here,
T
specifies the type of entries stored in the list view. Often, these are entries of type
String
, but other types are also allowed.
Here is the
ListView
constructor that we will use:
ListView(ObservableList<T>
list
)
The list of items to be displayed is specified by
list
. It is an object of type
ObservableList
.
As explained earlier,
ObservableList
supports a list of objects. By default, a
ListView
al-
lows only one item in the list to be selected at any one time. You can allow multiple selec-
tions by changing the selection mode, but we will use the default, single-selection mode.
Probably the easiest way to create an
ObservableList
for use in a
ListView
is to use the
factory method
observableArrayList( )
, which is a
static
method defined by the
FXCol-
lections
class (which is packaged in
javafx.collections
). The version we will use is shown
here:
static <E> ObservableList<E> observableArrayList(E …
elements
)
In this case,
E
specifies the type of elements, which are passed via
elements
.
Although
ListView
provides a default size, sometimes you will want to set the preferred
height and/or width to best match your needs. One way to do this is to call the
setPre-
fHeight( )
and
setPrefWidth( )
methods, shown here:
final void setPrefHeight(double
height
)
final void setPrefWidth(double
width
)
Alternatively, you can use a single call to set both dimensions at the same time by use of
setPrefSize( )
, shown here:
void setPrefSize(double
width
, double
height
)
